c interop type foundation

LANGUAGE.md

@@ -12,17 +12,24 @@
 
 ### types and expressions
 
-- `i8`, `i16`, `i32`, `i64`, `void`, and inferred integer-constrained `int`
+- exact-width `i8` through `i64`, `u8` through `u64`, `f32`, `f64`, `isize`, `usize`, `void`, and inferred integer-constrained `int`
+- target-dependent atomic C primitives from `c_char` through `c_longdouble`
+- C primitives remain semantically distinct from exact-width Brolang primitives until target lowering
 - contextual integer literals and constant folding of addition and negation trees
-- checked signed integer addition and unary negation
+- strict numeric conversions, checked integer addition, and unary negation
-- function calls, assignments, and returns
+- arrays `[N]T`, sentinel arrays `[N;S]T`, indexing, pointers, pointer offsets, slices, and explicit slicing
+- immutable UTF-8 sentinel-slice strings and Unicode code-point character literals
+- optionals with trapping postfix `?`, `orelse`, and nullable pointer representation
+- source-order native structs, keyed literals, and defined or opaque pointer-only `c_struct`
+- postfix pointer dereference, explicit `.ptr`/`.len`, general writable locations, function calls, assignments, and returns
 
 ### functions and packages
 
 - demand-monomorphized functions
-- bodyful `c func` definitions using the c calling convention
+- bodyful `c_func` definitions using the c calling convention
-- bodyless `c func` declarations with exact, globally unique external symbol names
+- bodyless `c_func` declarations with exact, globally unique external symbol names
 - concrete-only foreign signatures
+- Apple Silicon C ABI scalar and pointer lowering, including narrow integer extension attributes
 - directory packages with merged declarations
 - file-local relative imports, aliases, and qualified member access
 
@@ -43,20 +50,12 @@
 
 ### scalar and compound types
 
-- unsigned integers, floats, characters, and target-dependent c scalar types
-- arrays `[N]T` and sentinel arrays `[N; S]T`
-- single-item pointers `@T` and many-item pointers `*T`
-- element and pointee mutability through `mut`, separate from binding mutability
-- slices `[]T` and sentinel slices `[; S]T`
-- string literals as immutable sentinel slices backed by static arrays
-- character literals
-- optionals with trapping `?` unwrap, `orelse` fallback, and nullable pointers
-- data-only native structs and target-layout `c struct` types
 - tuples and native variadic functions
+- C unions, C enums, and by-value C record ABI lowering
 
 ### c imports
 
 - c headers imported as synthetic package namespaces
 - typedefs, enums, opaque records, and external variables
 - function pointers, callbacks, macros, and static inline functions
-- target-specific by-value c record and union ABI lowering
+- target-specific by-value C record and union ABI lowering

README.md

@@ -9,11 +9,12 @@ odin build . -out:build/brolang
 ./build/prototype
 ```
 
-Bodyless `c func` declarations bind exact external symbols and require concrete
+Bodyless `c_func` declarations bind exact external symbols and require concrete
-types:
+types. C primitives use atomic target-dependent names and remain semantically
+distinct from exact-width Brolang primitives:
 
 ```bro
-foreign_add :: c func(a, b i32) i32
+strlen :: c_func(value *c_char) c_ulong
 ```
 
 Additional native inputs and libraries are passed to the final `zig cc`
@@ -56,7 +57,10 @@ Current prototype features:
 - Newline-terminated, multiline statements; `}` may terminate a block's final statement
 - `#` comments
 - Immutable `::` bindings, mutable function-local `=` bindings, and `_` sinks
-- `i8`, `i16`, `i32`, `i64`, and loose integer-constrained `int`
+- Exact-width signed/unsigned integers, `f32`, `f64`, `isize`, `usize`, and loose integer-constrained `int`
+- Target-dependent atomic `c_*` primitive types, `c_func`, and pointer-only `c_struct`
+- Arrays, sentinel arrays, pointers, slices, sentinel slices, strings, character literals, optionals, and native structs
+- Explicit `.ptr`/`.len`, slicing, postfix pointer dereference and optional unwrap, and keyed struct literals
 - Contextual integer constants and compile-time folding of addition and unary negation trees
 - Directory packages with merged declarations and file-local relative imports
 - Qualified imported globals and functions with package-aware symbol mangling

TODO.md

@@ -4,8 +4,10 @@
 
 # milestones
 
-1. interop type foundation
+1. interop type foundation (implemented)
    - unsigned integers, floats, and target-dependent c scalar types
+   - atomic `c_*` primitive types remain distinct until target-aware lowering
+   - `c_func` and pointer-only `c_struct`; `c` remains an ordinary identifier
    - keep binding mutability (`::` / `=`) separate from element or pointee mutability (`mut`)
    - arrays and indexing
      - `[N]T`: array with `N` logical elements
@@ -13,7 +15,7 @@
    - pointers
      - `@T` / `@mut T`: non-null single-item pointer without arithmetic
      - `*T` / `*mut T`: non-null many-item pointer with arithmetic
-     - optional pointers represent nullable pointers
+     - optional pointers represent nullable pointers (i.e. `?@T` / `?@mut T`, `?*T` / `?*mut T`)
    - slices and slicing
      - `[]T`: pointer and length
      - `[;S]T`: pointer and length with a sentinel invariant
@@ -22,9 +24,9 @@
    - character literals
    - optionals with trapping unwrap and fallback operations
    - native structs with compiler-controlled layout
-   - pointer-only `c struct` support with target c layout
+   - pointer-only `c_struct` support with target c layout
-     - `Some :: c struct { ... }`: defined c-layout struct
+     - `Some :: c_struct { ... }`: defined c-layout struct
-     - `Some :: c struct`: opaque c-layout struct
+     - `Some :: c_struct`: opaque c-layout struct
      - defer passing c structs by value until target ABI classification exists
 
 2. restricted c header imports

compiler/ast/ast.odin

@@ -2,6 +2,7 @@ package ast
 
 import "../source"
 import "../symbol"
+import "../types"
 import "core:mem"
 
 Expr_Id :: distinct u32
@@ -60,20 +61,25 @@ index :: proc(id: $T, invalid: T, count: int) -> (int, bool) {
 	return value, id != invalid && value < count
 }
 
-Type_Syntax :: enum u8 {
+Type_Syntax :: types.Type
-	Invalid,
-	Int,
-	I8,
-	I16,
-	I32,
-	I64,
-	Void,
-}
 
 Expr_Kind :: enum u8 {
 	Invalid,
 	Integer,
+	Float,
+	String,
+	Array,
+	None,
 	Name,
+	Address,
+	Deref,
+	Index,
+	Slice,
+	Field,
+	Unwrap,
+	Orelse,
+	Struct_Literal,
+	Keyed,
 	Negate,
 	Add,
 	Call,
@@ -111,6 +117,7 @@ Stmt :: struct {
 	name:       symbol.Id,
 	type:       Type_Syntax,
 	immutable:  bool,
+	target:     Expr_Id,
 	expr:       Expr_Id,
 	diagnostic: source.Diagnostic_Id,
 }
@@ -170,12 +177,15 @@ Module :: struct {
 	imports:    [dynamic]Import,
 	files:      [dynamic]File,
 	packages:   [dynamic]Package,
+	strings:    [dynamic]string,
+	type_store: types.Store,
 	allocator:  mem.Allocator,
 }
 
 init_module :: proc(allocator := context.allocator) -> Module {
 	module: Module
 	module.allocator = allocator
+	module.type_store = types.init_store(allocator)
 	module.exprs.allocator = allocator
 	module.statements.allocator = allocator
 	module.functions.allocator = allocator
@@ -183,6 +193,7 @@ init_module :: proc(allocator := context.allocator) -> Module {
 	module.imports.allocator = allocator
 	module.files.allocator = allocator
 	module.packages.allocator = allocator
+	module.strings.allocator = allocator
 	return module
 }
 
@@ -200,6 +211,9 @@ destroy_module :: proc(module: ^Module) {
 	for pkg in module.packages {
 		delete(pkg.path, module.allocator)
 	}
+	for value in module.strings {
+		delete(value, module.allocator)
+	}
 	delete(module.exprs)
 	delete(module.statements)
 	delete(module.functions)
@@ -207,4 +221,6 @@ destroy_module :: proc(module: ^Module) {
 	delete(module.imports)
 	delete(module.files)
 	delete(module.packages)
+	delete(module.strings)
+	types.destroy_store(&module.type_store)
 }

compiler/backend/backend.odin

@@ -1,6 +1,7 @@
 package backend
 
 import "../linker"
+import "../target"
 import "core:fmt"
 import "core:mem"
 import "core:os"
@@ -14,6 +15,7 @@ append_owned :: proc(command: ^[dynamic]string, value: string, allocator: mem.Al
 build_command :: proc(
 	llvm_path, output_path: string,
 	link_arguments: []linker.Argument,
+	selected := target.DEFAULT,
 	allocator := context.allocator,
 ) -> []string {
 	command: [dynamic]string
@@ -21,6 +23,8 @@ build_command :: proc(
 	append_owned(&command, "/usr/bin/env", allocator)
 	append_owned(&command, "zig", allocator)
 	append_owned(&command, "cc", allocator)
+	append_owned(&command, "-target", allocator)
+	append_owned(&command, target.name(selected), allocator)
 	append_owned(&command, "-Wno-override-module", allocator)
 	append_owned(&command, llvm_path, allocator)
 	for argument in link_arguments {
@@ -45,12 +49,16 @@ destroy_command :: proc(command: []string, allocator := context.allocator) {
 	delete(command, allocator)
 }
 
-compile :: proc(llvm_path, output_path: string, link_arguments: []linker.Argument = nil) -> bool {
+compile :: proc(
+	llvm_path, output_path: string,
+	link_arguments: []linker.Argument = nil,
+	selected := target.DEFAULT,
+) -> bool {
 	pid := os2.get_pid()
 	temporary_output := fmt.tprintf("%s.brolang-tmp-%d", output_path, pid)
 	defer _ = os.remove(temporary_output)
 
-	command := build_command(llvm_path, temporary_output, link_arguments)
+	command := build_command(llvm_path, temporary_output, link_arguments, selected)
 	defer destroy_command(command)
 	state, stdout, stderr, err := os2.process_exec(
 		os2.Process_Desc{command=command},

compiler/compiler.odin

@@ -9,12 +9,17 @@ import "./lower"
 import "./opt"
 import "./source"
 import "./symbol"
+import "./target"
 import "core:fmt"
 import vmem "core:mem/virtual"
 import "core:os"
 import "core:os/os2"
 
-compile_package :: proc(input_path, output_path: string, link_arguments: []linker.Argument = nil) -> int {
+compile_package :: proc(
+	input_path, output_path: string,
+	link_arguments: []linker.Argument = nil,
+	selected := target.DEFAULT,
+) -> int {
 	sources := source.init_store()
 	defer source.destroy_store(&sources)
 	diagnostics := source.init_store_diagnostics(&sources)
@@ -61,7 +66,7 @@ compile_package :: proc(input_path, output_path: string, link_arguments: []linke
 		return 2
 	}
 	vmem.arena_free_all(&lexer_arena)
-	hir_module := checker.check(&ast_module, &diagnostics, &symbols, vmem.arena_allocator(&checker_arena))
+	hir_module := checker.check(&ast_module, &diagnostics, &symbols, selected, vmem.arena_allocator(&checker_arena))
 	vmem.arena_free_all(&parser_arena)
 	ir_module := lower.lower(&hir_module, vmem.arena_allocator(&lower_arena))
 	vmem.arena_free_all(&checker_arena)
@@ -78,7 +83,7 @@ compile_package :: proc(input_path, output_path: string, link_arguments: []linke
 	}
 
 	source.print_all(&diagnostics)
-	if !backend.compile(llvm_path, output_path, link_arguments) {
+	if !backend.compile(llvm_path, output_path, link_arguments, selected) {
 		return 2
 	}
 	if len(diagnostics.items) > 0 {

compiler/hir/hir.odin

@@ -2,6 +2,7 @@ package hir
 
 import "../source"
 import "../symbol"
+import "../target"
 import "../types"
 import "core:mem"
 
@@ -74,11 +75,27 @@ Linkage :: enum u8 {
 Expr_Kind :: enum u8 {
 	Invalid,
 	Integer,
+	Float,
+	String,
+	Array,
+	Struct,
+	None,
+	Optional_Some,
 	Local,
 	Global,
+	Address,
+	Deref,
+	Index,
+	Slice,
+	Field,
+	Length,
+	Slice_Ptr,
+	Unwrap,
+	Orelse,
 	Widen,
 	Negate,
 	Add,
+	Pointer_Add,
 	Call,
 }
 
@@ -114,6 +131,7 @@ Stmt :: struct {
 	kind:       Stmt_Kind,
 	span:       source.Span,
 	local:      Local_Id,
+	target:     Expr_Id,
 	expr:       Expr_Id,
 	diagnostic: source.Diagnostic_Id,
 }
@@ -153,16 +171,23 @@ Module :: struct {
 	statements: [dynamic]Stmt,
 	functions:  [dynamic]Function,
 	globals:    [dynamic]Global,
+	strings:    [dynamic]string,
+	types:      types.Store,
+	target:     target.Target,
 	allocator:  mem.Allocator,
 }
 
-init_module :: proc(allocator := context.allocator) -> Module {
+init_module :: proc(selected := target.DEFAULT, allocator := context.allocator) -> Module {
 	module: Module
+	module.target = selected
+	module.types = types.init_store(allocator)
+	module.types.selected = selected
 	module.allocator = allocator
 	module.exprs.allocator = allocator
 	module.statements.allocator = allocator
 	module.functions.allocator = allocator
 	module.globals.allocator = allocator
+	module.strings.allocator = allocator
 	return module
 }
 
@@ -182,8 +207,13 @@ destroy_module :: proc(module: ^Module) {
 		delete(global.dependencies)
 		delete(global.calls, module.allocator)
 	}
+	for value in module.strings {
+		delete(value, module.allocator)
+	}
 	delete(module.exprs)
 	delete(module.statements)
 	delete(module.functions)
 	delete(module.globals)
+	delete(module.strings)
+	types.destroy_store(&module.types)
 }

compiler/ir/ir.odin

@@ -2,6 +2,7 @@ package ir
 
 import "../source"
 import "../symbol"
+import "../target"
 import "../types"
 import "core:mem"
 
@@ -67,13 +68,28 @@ Linkage :: enum u8 {
 Opcode :: enum u8 {
 	Param,
 	Const,
+	String,
+	Aggregate,
+	None,
+	Optional_Some,
 	Load_Global,
+	Address_Global,
+	Address_Of,
 	Alloca,
+	Index_Address,
+	Field_Address,
 	Load,
 	Store,
+	Slice,
+	Length,
+	Slice_Ptr,
+	Unwrap,
+	Orelse_Begin,
+	Orelse,
 	Widen,
 	Neg_Checked,
 	Add_Checked,
+	Pointer_Add,
 	Call,
 	Trap,
 	Return,
@@ -117,13 +133,20 @@ Global :: struct {
 Module :: struct {
 	functions: [dynamic]Function,
 	globals:   [dynamic]Global,
+	strings:   [dynamic]string,
+	types:     types.Store,
+	target:    target.Target,
 	allocator: mem.Allocator,
 }
 
-init_module :: proc(allocator := context.allocator) -> Module {
+init_module :: proc(selected := target.DEFAULT, allocator := context.allocator) -> Module {
 	module: Module
+	module.target = selected
+	module.types = types.init_store(allocator)
+	module.types.selected = selected
 	module.functions.allocator = allocator
 	module.globals.allocator = allocator
+	module.strings.allocator = allocator
 	module.allocator = allocator
 	return module
 }
@@ -144,6 +167,11 @@ destroy_module :: proc(module: ^Module) {
 	for global in module.globals {
 		destroy_instructions(global.initializer, module.allocator)
 	}
+	for value in module.strings {
+		delete(value, module.allocator)
+	}
 	delete(module.functions)
 	delete(module.globals)
+	delete(module.strings)
+	types.destroy_store(&module.types)
 }

compiler/lexer/lexer.odin

@@ -14,16 +14,44 @@ is_identifier_continue :: proc(value: byte) -> bool {
 
 keyword_kind :: proc(text: string) -> token.Kind {
 	switch text {
-	case "func":   return .Keyword_Func
+	case "func":          return .Keyword_Func
-	case "import": return .Keyword_Import
+	case "c_func":        return .Keyword_C_Func
-	case "return": return .Keyword_Return
+	case "struct":        return .Keyword_Struct
-	case "void":   return .Keyword_Void
+	case "c_struct":      return .Keyword_C_Struct
-	case "int":    return .Keyword_Int
+	case "import":        return .Keyword_Import
-	case "i8":     return .Keyword_I8
+	case "return":        return .Keyword_Return
-	case "i16":    return .Keyword_I16
+	case "mut":           return .Keyword_Mut
-	case "i32":    return .Keyword_I32
+	case "none":          return .Keyword_None
-	case "i64":    return .Keyword_I64
+	case "orelse":        return .Keyword_Orelse
-	case "_":      return .Underscore
+	case "void":          return .Keyword_Void
+	case "int":           return .Keyword_Int
+	case "i8":            return .Keyword_I8
+	case "i16":           return .Keyword_I16
+	case "i32":           return .Keyword_I32
+	case "i64":           return .Keyword_I64
+	case "u8":            return .Keyword_U8
+	case "u16":           return .Keyword_U16
+	case "u32":           return .Keyword_U32
+	case "u64":           return .Keyword_U64
+	case "isize":         return .Keyword_Isize
+	case "usize":         return .Keyword_Usize
+	case "f32":           return .Keyword_F32
+	case "f64":           return .Keyword_F64
+	case "c_char":        return .Keyword_C_Char
+	case "c_schar":       return .Keyword_C_Schar
+	case "c_uchar":       return .Keyword_C_Uchar
+	case "c_short":       return .Keyword_C_Short
+	case "c_ushort":      return .Keyword_C_Ushort
+	case "c_int":         return .Keyword_C_Int
+	case "c_uint":        return .Keyword_C_Uint
+	case "c_long":        return .Keyword_C_Long
+	case "c_ulong":       return .Keyword_C_Ulong
+	case "c_longlong":    return .Keyword_C_Longlong
+	case "c_ulonglong":   return .Keyword_C_Ulonglong
+	case "c_float":       return .Keyword_C_Float
+	case "c_double":      return .Keyword_C_Double
+	case "c_longdouble":  return .Keyword_C_Longdouble
+	case "_":             return .Underscore
 	}
 	return .Identifier
 }
@@ -87,7 +115,34 @@ lex :: proc(
 			append_token(&stream, source_file, .Minus, cursor, cursor+1)
 			cursor += 1
 		case '.':
-			append_token(&stream, source_file, .Dot, cursor, cursor+1)
+			start := cursor
+			cursor += 1
+			if cursor < len(bytes) && bytes[cursor] == '.' {
+				cursor += 1
+				append_token(&stream, source_file, .Range, start, cursor)
+			} else {
+				append_token(&stream, source_file, .Dot, start, cursor)
+			}
+		case '@':
+			append_token(&stream, source_file, .At, cursor, cursor+1)
+			cursor += 1
+		case '*':
+			append_token(&stream, source_file, .Star, cursor, cursor+1)
+			cursor += 1
+		case '&':
+			append_token(&stream, source_file, .Ampersand, cursor, cursor+1)
+			cursor += 1
+		case '^':
+			append_token(&stream, source_file, .Caret, cursor, cursor+1)
+			cursor += 1
+		case '?':
+			append_token(&stream, source_file, .Question, cursor, cursor+1)
+			cursor += 1
+		case '[':
+			append_token(&stream, source_file, .Left_Bracket, cursor, cursor+1)
+			cursor += 1
+		case ']':
+			append_token(&stream, source_file, .Right_Bracket, cursor, cursor+1)
 			cursor += 1
 		case '(':
 			append_token(&stream, source_file, .Left_Paren, cursor, cursor+1)
@@ -111,11 +166,13 @@ lex :: proc(
 			for cursor < len(bytes) && bytes[cursor] != '"' && bytes[cursor] != '\n' {
 				if bytes[cursor] == '\\' {
 					cursor += 1
-					if cursor >= len(bytes) || (bytes[cursor] != '\\' && bytes[cursor] != '"') {
+					if cursor >= len(bytes) ||
+					   (bytes[cursor] != '\\' && bytes[cursor] != '"' && bytes[cursor] != 'n' &&
+					    bytes[cursor] != 'r' && bytes[cursor] != 't' && bytes[cursor] != '0') {
 						source.add(
 							diagnostics,
 							source.Span{file=source_file.id, start=source.Offset(max(cursor-1, start)), end=source.Offset(min(cursor+1, len(bytes)))},
-							"import strings only support '\\\\' and '\\\"' escapes",
+							"strings only support '\\\\', '\\\"', '\\n', '\\r', '\\t', and '\\0' escapes",
 						)
 						valid = false
 					}
@@ -136,20 +193,44 @@ lex :: proc(
 				append_token(&stream, source_file, .Invalid, start, cursor, diagnostic=id)
 			}
 		case ';':
-			id := source.add(
+			append_token(&stream, source_file, .Semicolon, cursor, cursor+1)
-				diagnostics,
-				source.Span{file=source_file.id, start=source.Offset(cursor), end=source.Offset(cursor+1)},
-				"semicolons are invalid; terminate statements with a newline",
-			)
-			append_token(&stream, source_file, .Invalid, cursor, cursor+1, diagnostic=id)
 			cursor += 1
+		case '\'':
+			start := cursor
+			cursor += 1
+			for cursor < len(bytes) && bytes[cursor] != '\'' && bytes[cursor] != '\n' {
+				if bytes[cursor] == '\\' && cursor+1 < len(bytes) {
+					cursor += 1
+				}
+				cursor += 1
+			}
+			if cursor < len(bytes) && bytes[cursor] == '\'' {
+				cursor += 1
+				append_token(&stream, source_file, .Character, start, cursor)
+			} else {
+				id := source.add(
+					diagnostics,
+					source.Span{file=source_file.id, start=source.Offset(start), end=source.Offset(cursor)},
+					"unterminated character literal",
+				)
+				append_token(&stream, source_file, .Invalid, start, cursor, diagnostic=id)
+			}
 		case:
 			if value >= '0' && value <= '9' {
 				start := cursor
 				for cursor < len(bytes) && bytes[cursor] >= '0' && bytes[cursor] <= '9' {
 					cursor += 1
 				}
-				append_token(&stream, source_file, .Integer, start, cursor)
+				kind := token.Kind.Integer
+				if cursor+1 < len(bytes) && bytes[cursor] == '.' &&
+				   bytes[cursor+1] != '.' && bytes[cursor+1] >= '0' && bytes[cursor+1] <= '9' {
+					kind = .Float
+					cursor += 1
+					for cursor < len(bytes) && bytes[cursor] >= '0' && bytes[cursor] <= '9' {
+						cursor += 1
+					}
+				}
+				append_token(&stream, source_file, kind, start, cursor)
 			} else if is_identifier_start(value) {
 				start := cursor
 				for cursor < len(bytes) && is_identifier_continue(bytes[cursor]) {

compiler/llvm/llvm.odin

@@ -3,6 +3,7 @@ package llvm
 import "../ir"
 import "../source"
 import "../symbol"
+import "../target"
 import "../types"
 import "core:fmt"
 import "core:mem"
@@ -21,11 +22,33 @@ Emitter :: struct {
 	allocator:   mem.Allocator,
 }
 
-llvm_type :: proc(value: types.Type) -> string {
+llvm_type :: proc(value: types.Type, store: ^types.Store = nil) -> string {
-	if value.kind == .Void {
+	if types.is_void(value) {
 		return "void"
 	}
-	switch value.bits {
+	#partial switch types.kind(value, store) {
+	case .Pointer:
+		return "ptr"
+	case .Slice:
+		return "{ ptr, i64 }"
+	case .Array:
+		item, _ := types.node(store, value)
+		return fmt.tprintf("[%d x %s]", types.physical_count(value, store), llvm_type(item.child, store))
+	case .Optional:
+		item, _ := types.node(store, value)
+		if types.is_pointer(item.child, store) {
+			return "ptr"
+		}
+		return fmt.tprintf("{{ i1, %s }}", llvm_type(item.child, store))
+	case .Struct:
+		return fmt.tprintf("%%bro.type.%d", value)
+	}
+	selected := store.selected if store != nil else target.DEFAULT
+	repr := types.representation(value, selected)
+	if types.is_float(repr) {
+		return "float" if types.bits(repr) == 32 else "double"
+	}
+	switch types.bits(repr) {
 	case 8:  return "i8"
 	case 16: return "i16"
 	case 32: return "i32"
@@ -33,15 +56,37 @@ llvm_type :: proc(value: types.Type) -> string {
 	}
 }
 
-function_result_type :: proc(function: ir.Function) -> string {
+function_result_type :: proc(function: ir.Function, store: ^types.Store) -> string {
 	if function.is_main {
 		return "i32"
 	}
-	return llvm_type(function.result)
+	return llvm_type(function.result, store)
 }
 
-sentinel :: proc(value_type: types.Type) -> i64 {
+c_abi_extension :: proc(value: types.Type, selected: target.Target) -> string {
-	switch value_type.bits {
+	if !types.is_concrete_integer(value) {
+		return ""
+	}
+	switch target.c_integer_extension(selected, types.bits(value, selected), types.is_signed(value, selected)) {
+	case .Sign: return "signext"
+	case .Zero: return "zeroext"
+	case .None: return ""
+	}
+	return ""
+}
+
+emit_function_result :: proc(builder: ^strings.Builder, function: ir.Function, store: ^types.Store) {
+	if function.calling_convention == .C {
+		extension := c_abi_extension(function.result, store.selected)
+		if len(extension) > 0 {
+			fmt.sbprintf(builder, "%s ", extension)
+		}
+	}
+	strings.write_string(builder, function_result_type(function, store))
+}
+
+sentinel :: proc(value_type: types.Type, selected := target.DEFAULT) -> i64 {
+	switch types.bits(value_type, selected) {
 	case 8:  return -86
 	case 16: return -21846
 	case 32: return -1431655766
@@ -53,29 +98,88 @@ valid_instruction :: proc(instructions: []ir.Instruction, instruction_id: ir.Ins
 	return instruction_id != ir.INVALID_INSTRUCTION && int(instruction_id) < len(instructions)
 }
 
-valid_value :: proc(instructions: []ir.Instruction, value_id: ir.Instruction_Id, expected: types.Type) -> bool {
+valid_value :: proc(
+	instructions: []ir.Instruction,
+	value_id: ir.Instruction_Id,
+	expected: types.Type,
+	store: ^types.Store,
+) -> bool {
 	if !valid_instruction(instructions, value_id) ||
-	   !types.is_concrete_integer(expected) ||
+	   !types.is_runtime_value(expected, store) ||
 	   !types.equal(instructions[value_id].type, expected) {
 		return false
 	}
 	switch instructions[value_id].op {
-	case .Param, .Const, .Load_Global, .Load, .Widen, .Neg_Checked, .Add_Checked, .Call:
+	case .Param, .Const, .String, .Aggregate, .None, .Optional_Some,
+	     .Load_Global, .Address_Of, .Load, .Slice, .Length, .Slice_Ptr, .Unwrap, .Orelse,
+	     .Widen, .Neg_Checked, .Add_Checked, .Pointer_Add, .Call:
 		return true
-	case .Alloca, .Store, .Trap, .Return, .Return_Void:
+	case .Address_Global, .Alloca, .Index_Address, .Field_Address, .Orelse_Begin,
+	     .Store, .Trap, .Return, .Return_Void:
 		return false
 	}
 	return false
 }
 
-write_operand :: proc(builder: ^strings.Builder, instructions: []ir.Instruction, value_id: ir.Instruction_Id, expected: types.Type) {
+valid_address :: proc(
-	if !valid_value(instructions, value_id, expected) {
+	instructions: []ir.Instruction,
-		fmt.sbprintf(builder, "%d", sentinel(expected))
+	value_id: ir.Instruction_Id,
+	pointee: types.Type,
+	store: ^types.Store,
+) -> bool {
+	if !valid_instruction(instructions, value_id) {
+		return false
+	}
+	value := instructions[value_id]
+	#partial switch value.op {
+	case .Address_Global, .Alloca, .Index_Address, .Field_Address:
+		return types.equal(value.type, pointee)
+	case:
+		return types.is_pointer(value.type, store) &&
+		       types.equal(types.child_type(value.type, store), pointee) &&
+		       valid_value(instructions, value_id, value.type, store)
+	}
+}
+
+write_constant :: proc(builder: ^strings.Builder, value: i64, value_type: types.Type, store: ^types.Store = nil) {
+	if !types.is_concrete_scalar(value_type) {
+		strings.write_string(builder, "zeroinitializer")
+		return
+	}
+	selected := store.selected if store != nil else target.DEFAULT
+	if types.is_float(value_type, selected) {
+		text := ""
+		if types.bits(value_type, selected) == 32 {
+			bits := u32(value)
+			number := transmute(f32)bits
+			text = fmt.tprintf("%.9g", number)
+		} else {
+			number := transmute(f64)value
+			text = fmt.tprintf("%.17g", number)
+		}
+		strings.write_string(builder, text)
+		if !strings.contains(text, ".") && !strings.contains(text, "e") && !strings.contains(text, "E") {
+			strings.write_string(builder, ".0")
+		}
+		return
+	}
+	fmt.sbprintf(builder, "%d", value)
+}
+
+write_operand :: proc(
+	builder: ^strings.Builder,
+	instructions: []ir.Instruction,
+	value_id: ir.Instruction_Id,
+	expected: types.Type,
+	store: ^types.Store,
+) {
+	if !valid_value(instructions, value_id, expected, store) {
+		write_constant(builder, sentinel(expected, store.selected), expected, store)
 		return
 	}
 	value := instructions[value_id]
 	if value.op == .Const {
-		fmt.sbprintf(builder, "%d", value.integer)
+		write_constant(builder, value.integer, expected, store)
 	} else {
 		fmt.sbprintf(builder, "%%v%d", value_id)
 	}
@@ -126,24 +230,59 @@ emit_trap_call :: proc(emitter: ^Emitter, message_id: int) {
 emit_recovery_value :: proc(emitter: ^Emitter, instruction_id: int, instruction: ir.Instruction, fallback: string) {
 	message := diagnostic_message(emitter, instruction.diagnostic, instruction.span, fallback)
 	emit_trap_call(emitter, message)
-	if types.is_concrete_integer(instruction.type) {
+	if types.is_runtime_value(instruction.type, &emitter.module.types) {
+		if !types.is_float(instruction.type, emitter.module.target) {
+			if !types.is_concrete_scalar(instruction.type) {
+				fmt.sbprintf(
+					&emitter.builder,
+					"  %%v%d = freeze %s zeroinitializer\n",
+					instruction_id,
+					llvm_type(instruction.type, &emitter.module.types),
+				)
+				return
+			}
+			fmt.sbprintf(
+				&emitter.builder,
+				"  %%v%d = add %s 0, %d\n",
+				instruction_id,
+				llvm_type(instruction.type, &emitter.module.types),
+				sentinel(instruction.type, emitter.module.target),
+			)
+			return
+		}
 		fmt.sbprintf(
 			&emitter.builder,
-			"  %%v%d = add %s 0, %d\n",
+			"  %%v%d = select i1 true, %s ",
 			instruction_id,
-			llvm_type(instruction.type),
+			llvm_type(instruction.type, &emitter.module.types),
-			sentinel(instruction.type),
 		)
+		write_constant(&emitter.builder, sentinel(instruction.type, emitter.module.target), instruction.type, &emitter.module.types)
+		fmt.sbprintf(&emitter.builder, ", %s ", llvm_type(instruction.type, &emitter.module.types))
+		write_constant(&emitter.builder, sentinel(instruction.type, emitter.module.target), instruction.type, &emitter.module.types)
+		strings.write_string(&emitter.builder, "\n")
 	}
 }
 
-emit_call_args :: proc(builder: ^strings.Builder, instructions: []ir.Instruction, args: []ir.Instruction_Id, param_types: []types.Type) {
+emit_call_args :: proc(
+	builder: ^strings.Builder,
+	instructions: []ir.Instruction,
+	args: []ir.Instruction_Id,
+	param_types: []types.Type,
+	store: ^types.Store,
+	c_abi := false,
+) {
 	for arg, index in args {
 		if index > 0 {
 			strings.write_string(builder, ", ")
 		}
-		fmt.sbprintf(builder, "%s ", llvm_type(param_types[index]))
+		fmt.sbprintf(builder, "%s ", llvm_type(param_types[index], store))
-		write_operand(builder, instructions, arg, param_types[index])
+		if c_abi {
+			extension := c_abi_extension(param_types[index], store.selected)
+			if len(extension) > 0 {
+				fmt.sbprintf(builder, "%s ", extension)
+			}
+		}
+		write_operand(builder, instructions, arg, param_types[index], store)
 	}
 }
 
@@ -163,6 +302,102 @@ emit_instruction_stream :: proc(
 		}
 		switch instruction.op {
 		case .Param, .Const:
+		case .String:
+			string_id := int(instruction.integer)
+			if string_id < 0 || string_id >= len(emitter.module.strings) ||
+			   !types.is_slice(instruction.type, &emitter.module.types) {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid string literal")
+				continue
+			}
+			type_name := llvm_type(instruction.type, &emitter.module.types)
+			fmt.sbprintf(
+				&emitter.builder,
+				"  %%string_ptr%d = insertvalue %s poison, ptr @bro.str.%d, 0\n",
+				instruction_index, type_name, string_id,
+			)
+			fmt.sbprintf(
+				&emitter.builder,
+				"  %%v%d = insertvalue %s %%string_ptr%d, i64 %d, 1\n",
+				instruction_index, type_name, instruction_index, len(emitter.module.strings[string_id]),
+			)
+		case .Aggregate:
+			item, ok := types.node(&emitter.module.types, instruction.type)
+			expected_count := 0
+			if ok && item.kind == .Array {
+				expected_count = int(item.count)
+			} else if ok && item.kind == .Struct {
+				expected_count = int(item.field_count)
+			} else {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid aggregate type")
+				continue
+			}
+			if len(instruction.args) != expected_count {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid aggregate operands")
+				continue
+			}
+			type_name := llvm_type(instruction.type, &emitter.module.types)
+			total := len(instruction.args) + (1 if item.kind == .Array && item.has_sentinel else 0)
+			if total == 0 {
+				fmt.sbprintf(&emitter.builder, "  %%v%d = freeze %s zeroinitializer\n", instruction_index, type_name)
+				continue
+			}
+			for arg_index := 0; arg_index < total; arg_index += 1 {
+				element_type := item.child
+				if item.kind == .Struct {
+					element_type = types.fields_for(&emitter.module.types, instruction.type)[arg_index].type
+				}
+				final := arg_index == total-1
+				if final {
+					fmt.sbprintf(&emitter.builder, "  %%v%d = insertvalue %s ", instruction_index, type_name)
+				} else {
+					fmt.sbprintf(&emitter.builder, "  %%aggregate%d_%d = insertvalue %s ", instruction_index, arg_index, type_name)
+				}
+				if arg_index == 0 {
+					strings.write_string(&emitter.builder, "poison")
+				} else {
+					fmt.sbprintf(&emitter.builder, "%%aggregate%d_%d", instruction_index, arg_index-1)
+				}
+				fmt.sbprintf(&emitter.builder, ", %s ", llvm_type(element_type, &emitter.module.types))
+				if arg_index < len(instruction.args) {
+					write_operand(&emitter.builder, instructions, instruction.args[arg_index], element_type, &emitter.module.types)
+				} else {
+					write_constant(&emitter.builder, i64(item.sentinel), element_type, &emitter.module.types)
+				}
+				fmt.sbprintf(&emitter.builder, ", %d\n", arg_index)
+			}
+		case .None:
+			item, ok := types.node(&emitter.module.types, instruction.type)
+			if !ok || item.kind != .Optional {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid optional none")
+				continue
+			}
+			if types.is_pointer(item.child, &emitter.module.types) {
+				fmt.sbprintf(&emitter.builder, "  %%v%d = select i1 true, ptr null, ptr null\n", instruction_index)
+			} else {
+				fmt.sbprintf(
+					&emitter.builder,
+					"  %%v%d = insertvalue %s zeroinitializer, i1 false, 0\n",
+					instruction_index, llvm_type(instruction.type, &emitter.module.types),
+				)
+			}
+		case .Optional_Some:
+			item, ok := types.node(&emitter.module.types, instruction.type)
+			if !ok || item.kind != .Optional ||
+			   !valid_value(instructions, instruction.a, item.child, &emitter.module.types) {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid optional value")
+				continue
+			}
+			if types.is_pointer(item.child, &emitter.module.types) {
+				fmt.sbprintf(&emitter.builder, "  %%v%d = select i1 true, ptr ", instruction_index)
+				write_operand(&emitter.builder, instructions, instruction.a, item.child, &emitter.module.types)
+				strings.write_string(&emitter.builder, ", ptr null\n")
+			} else {
+				type_name := llvm_type(instruction.type, &emitter.module.types)
+				fmt.sbprintf(&emitter.builder, "  %%optional%d = insertvalue %s poison, i1 true, 0\n", instruction_index, type_name)
+				fmt.sbprintf(&emitter.builder, "  %%v%d = insertvalue %s %%optional%d, %s ", instruction_index, type_name, instruction_index, llvm_type(item.child, &emitter.module.types))
+				write_operand(&emitter.builder, instructions, instruction.a, item.child, &emitter.module.types)
+				strings.write_string(&emitter.builder, ", 1\n")
+			}
 		case .Load_Global:
 			global_id := ir.as_global(instruction.target)
 			if global_id == ir.INVALID_GLOBAL || int(global_id) >= len(emitter.module.globals) {
@@ -179,7 +414,7 @@ emit_instruction_stream :: proc(
 					&emitter.builder,
 					"  %%v%d = load %s, ptr @bro.g.%d\n",
 					instruction_index,
-					llvm_type(global.type),
+					llvm_type(global.type, &emitter.module.types),
 					global_id,
 				)
 			} else {
@@ -187,20 +422,115 @@ emit_instruction_stream :: proc(
 					&emitter.builder,
 					"  %%v%d = call %s @bro.get.%d()\n",
 					instruction_index,
-					llvm_type(global.type),
+					llvm_type(global.type, &emitter.module.types),
 					global_id,
 				)
 			}
+		case .Address_Global:
+			global_id := ir.as_global(instruction.target)
+			if global_id == ir.INVALID_GLOBAL || int(global_id) >= len(emitter.module.globals) ||
+			   !types.equal(instruction.type, emitter.module.globals[global_id].type) {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid global address")
+				continue
+			}
+			fmt.sbprintf(
+				&emitter.builder,
+				"  %%v%d = getelementptr %s, ptr @bro.g.%d, i64 0\n",
+				instruction_index, llvm_type(instruction.type, &emitter.module.types), global_id,
+			)
+		case .Address_Of:
+			child := types.child_type(instruction.type, &emitter.module.types)
+			if !types.is_pointer(instruction.type, &emitter.module.types) ||
+			   !valid_address(instructions, instruction.a, child, &emitter.module.types) {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid address operand")
+				continue
+			}
+			fmt.sbprintf(
+				&emitter.builder,
+				"  %%v%d = getelementptr %s, ptr %%v%d, i64 0\n",
+				instruction_index, llvm_type(child, &emitter.module.types), instruction.a,
+			)
 		case .Alloca:
-			if !types.is_concrete_integer(instruction.type) {
+			if !types.is_runtime_value(instruction.type, &emitter.module.types) {
 				emit_recovery_value(emitter, instruction_index, instruction, "invalid allocation type")
 				continue
 			}
-			fmt.sbprintf(&emitter.builder, "  %%v%d = alloca %s\n", instruction_index, llvm_type(instruction.type))
+			fmt.sbprintf(&emitter.builder, "  %%v%d = alloca %s\n", instruction_index, llvm_type(instruction.type, &emitter.module.types))
-		case .Load:
+		case .Index_Address:
 			if !valid_instruction(instructions, instruction.a) ||
-			   instructions[instruction.a].op != .Alloca ||
+			   !valid_value(instructions, instruction.b, types.USIZE, &emitter.module.types) {
-			   !types.equal(instructions[instruction.a].type, instruction.type) {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid index operands")
+				continue
+			}
+			container := instructions[instruction.a]
+			container_node, container_ok := types.node(&emitter.module.types, container.type)
+			if !container_ok {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid index container")
+				continue
+			}
+			pointer_name := fmt.tprintf("%%v%d", instruction.a)
+			length: u64
+			bounded := false
+			if container_node.kind == .Array {
+				length = container_node.count
+				if container_node.has_sentinel && instruction.integer != 0 {
+					length += 1
+				}
+				bounded = true
+			} else if container_node.kind == .Slice {
+				fmt.sbprintf(&emitter.builder, "  %%index_ptr%d = extractvalue %s %%v%d, 0\n", instruction_index, llvm_type(container.type, &emitter.module.types), instruction.a)
+				fmt.sbprintf(&emitter.builder, "  %%index_len%d = extractvalue %s %%v%d, 1\n", instruction_index, llvm_type(container.type, &emitter.module.types), instruction.a)
+				pointer_name = fmt.tprintf("%%index_ptr%d", instruction_index)
+				comparison := "ule" if container_node.has_sentinel && instruction.integer != 0 else "ult"
+				fmt.sbprintf(&emitter.builder, "  %%index_ok%d = icmp %s i64 ", instruction_index, comparison)
+				write_operand(&emitter.builder, instructions, instruction.b, types.USIZE, &emitter.module.types)
+				fmt.sbprintf(&emitter.builder, ", %%index_len%d\n", instruction_index)
+				bounded = true
+			} else if container_node.kind != .Pointer || !container_node.many {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid index container")
+				continue
+			}
+			if bounded {
+				if container_node.kind == .Array {
+					fmt.sbprintf(&emitter.builder, "  %%index_ok%d = icmp ult i64 ", instruction_index)
+					write_operand(&emitter.builder, instructions, instruction.b, types.USIZE, &emitter.module.types)
+					fmt.sbprintf(&emitter.builder, ", %d\n", length)
+				}
+				fmt.sbprintf(&emitter.builder, "  br i1 %%index_ok%d, label %%index_continue%d, label %%index_trap%d\nindex_trap%d:\n", instruction_index, instruction_index, instruction_index, instruction_index)
+				message := diagnostic_message(emitter, source.INVALID_DIAGNOSTIC, instruction.span, "index out of bounds")
+				emit_trap_call(emitter, message)
+				fmt.sbprintf(&emitter.builder, "  unreachable\nindex_continue%d:\n", instruction_index)
+			}
+			if container_node.kind == .Array {
+				fmt.sbprintf(&emitter.builder, "  %%v%d = getelementptr %s, ptr %s, i64 0, i64 ", instruction_index, llvm_type(container.type, &emitter.module.types), pointer_name)
+			} else {
+				fmt.sbprintf(&emitter.builder, "  %%v%d = getelementptr %s, ptr %s, i64 ", instruction_index, llvm_type(instruction.type, &emitter.module.types), pointer_name)
+			}
+			write_operand(&emitter.builder, instructions, instruction.b, types.USIZE, &emitter.module.types)
+			strings.write_string(&emitter.builder, "\n")
+		case .Field_Address:
+			if !valid_instruction(instructions, instruction.a) {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid field base")
+				continue
+			}
+			base_type := instructions[instruction.a].type
+			if types.is_pointer(base_type, &emitter.module.types) {
+				base_type = types.child_type(base_type, &emitter.module.types)
+			}
+			fields := types.fields_for(&emitter.module.types, base_type)
+			field_index := int(instruction.integer)
+			if field_index < 0 || field_index >= len(fields) ||
+			   !types.equal(fields[field_index].type, instruction.type) {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid field reference")
+				continue
+			}
+			fmt.sbprintf(
+				&emitter.builder,
+				"  %%v%d = getelementptr %s, ptr %%v%d, i32 0, i32 %d\n",
+				instruction_index, llvm_type(base_type, &emitter.module.types), instruction.a, field_index,
+			)
+		case .Load:
+			if !valid_address(instructions, instruction.a, instruction.type, &emitter.module.types) {
 				emit_recovery_value(emitter, instruction_index, instruction, "invalid load slot")
 				continue
 			}
@@ -208,42 +538,191 @@ emit_instruction_stream :: proc(
 				&emitter.builder,
 				"  %%v%d = load %s, ptr %%v%d\n",
 				instruction_index,
-				llvm_type(instruction.type),
+				llvm_type(instruction.type, &emitter.module.types),
 				instruction.a,
 			)
 		case .Store:
-			if !valid_instruction(instructions, instruction.a) ||
+			if !valid_address(instructions, instruction.a, instruction.type, &emitter.module.types) ||
-			   instructions[instruction.a].op != .Alloca ||
+			   !valid_value(instructions, instruction.b, instruction.type, &emitter.module.types) {
-			   !types.equal(instructions[instruction.a].type, instruction.type) ||
-			   !valid_value(instructions, instruction.b, instruction.type) {
 				emit_recovery_value(emitter, instruction_index, instruction, "invalid store operand")
 				continue
 			}
-			fmt.sbprintf(&emitter.builder, "  store %s ", llvm_type(instruction.type))
+			fmt.sbprintf(&emitter.builder, "  store %s ", llvm_type(instruction.type, &emitter.module.types))
-			write_operand(&emitter.builder, instructions, instruction.b, instruction.type)
+			write_operand(&emitter.builder, instructions, instruction.b, instruction.type, &emitter.module.types)
 			fmt.sbprintf(&emitter.builder, ", ptr %%v%d\n", instruction.a)
+		case .Slice:
+			if !valid_instruction(instructions, instruction.a) {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid slice container")
+				continue
+			}
+			container := instructions[instruction.a]
+			item, ok := types.node(&emitter.module.types, container.type)
+			if !ok || (item.kind != .Array && item.kind != .Slice) {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid slice container")
+				continue
+			}
+			pointer_name := fmt.tprintf("%%v%d", instruction.a)
+			length_name := fmt.tprintf("%d", item.count)
+			if item.kind == .Array {
+				fmt.sbprintf(&emitter.builder, "  %%slice_ptr%d = getelementptr %s, ptr %%v%d, i64 0, i64 0\n", instruction_index, llvm_type(container.type, &emitter.module.types), instruction.a)
+				pointer_name = fmt.tprintf("%%slice_ptr%d", instruction_index)
+			} else if item.kind == .Slice {
+				fmt.sbprintf(&emitter.builder, "  %%slice_ptr%d = extractvalue %s %%v%d, 0\n", instruction_index, llvm_type(container.type, &emitter.module.types), instruction.a)
+				fmt.sbprintf(&emitter.builder, "  %%slice_len%d = extractvalue %s %%v%d, 1\n", instruction_index, llvm_type(container.type, &emitter.module.types), instruction.a)
+				pointer_name = fmt.tprintf("%%slice_ptr%d", instruction_index)
+				length_name = fmt.tprintf("%%slice_len%d", instruction_index)
+			}
+			fmt.sbprintf(&emitter.builder, "  %%slice_bound_start%d = add i64 0, ", instruction_index)
+			if len(instruction.args) > 0 && instruction.args[0] != ir.INVALID_INSTRUCTION {
+				write_operand(&emitter.builder, instructions, instruction.args[0], types.USIZE, &emitter.module.types)
+			} else {
+				strings.write_string(&emitter.builder, "0")
+			}
+			strings.write_string(&emitter.builder, "\n")
+			fmt.sbprintf(&emitter.builder, "  %%slice_bound_end%d = add i64 0, ", instruction_index)
+			if len(instruction.args) > 1 && instruction.args[1] != ir.INVALID_INSTRUCTION {
+				write_operand(&emitter.builder, instructions, instruction.args[1], types.USIZE, &emitter.module.types)
+			} else {
+				strings.write_string(&emitter.builder, length_name)
+			}
+			strings.write_string(&emitter.builder, "\n")
+			start_name := fmt.tprintf("%%slice_bound_start%d", instruction_index)
+			end_name := fmt.tprintf("%%slice_bound_end%d", instruction_index)
+			fmt.sbprintf(&emitter.builder, "  %%slice_order%d = icmp ule i64 %s, %s\n", instruction_index, start_name, end_name)
+			fmt.sbprintf(&emitter.builder, "  %%slice_end_ok%d = icmp ule i64 %s, %s\n", instruction_index, end_name, length_name)
+			fmt.sbprintf(&emitter.builder, "  %%slice_ok%d = and i1 %%slice_order%d, %%slice_end_ok%d\n", instruction_index, instruction_index, instruction_index)
+			fmt.sbprintf(&emitter.builder, "  br i1 %%slice_ok%d, label %%slice_continue%d, label %%slice_trap%d\nslice_trap%d:\n", instruction_index, instruction_index, instruction_index, instruction_index)
+			message := diagnostic_message(emitter, source.INVALID_DIAGNOSTIC, instruction.span, "slice bounds out of range")
+			emit_trap_call(emitter, message)
+			fmt.sbprintf(&emitter.builder, "  unreachable\nslice_continue%d:\n", instruction_index)
+			fmt.sbprintf(&emitter.builder, "  %%slice_start%d = getelementptr %s, ptr %s, i64 %s\n", instruction_index, llvm_type(item.child, &emitter.module.types), pointer_name, start_name)
+			fmt.sbprintf(&emitter.builder, "  %%slice_result%d = insertvalue %s poison, ptr %%slice_start%d, 0\n", instruction_index, llvm_type(instruction.type, &emitter.module.types), instruction_index)
+			fmt.sbprintf(&emitter.builder, "  %%slice_result_len%d = sub i64 %s, %s\n", instruction_index, end_name, start_name)
+			fmt.sbprintf(&emitter.builder, "  %%v%d = insertvalue %s %%slice_result%d, i64 %%slice_result_len%d, 1\n", instruction_index, llvm_type(instruction.type, &emitter.module.types), instruction_index, instruction_index)
+		case .Length:
+			if !valid_instruction(instructions, instruction.a) ||
+			   !types.is_slice(instructions[instruction.a].type, &emitter.module.types) {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid slice length")
+				continue
+			}
+			fmt.sbprintf(
+				&emitter.builder,
+				"  %%v%d = extractvalue %s %%v%d, 1\n",
+				instruction_index,
+				llvm_type(instructions[instruction.a].type, &emitter.module.types),
+				instruction.a,
+			)
+		case .Slice_Ptr:
+			if !valid_instruction(instructions, instruction.a) ||
+			   !types.is_pointer(instruction.type, &emitter.module.types) {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid container pointer")
+				continue
+			}
+			container_type := instructions[instruction.a].type
+			if types.is_array(container_type, &emitter.module.types) {
+				fmt.sbprintf(
+					&emitter.builder,
+					"  %%v%d = getelementptr %s, ptr %%v%d, i64 0, i64 0\n",
+					instruction_index, llvm_type(container_type, &emitter.module.types), instruction.a,
+				)
+			} else if types.is_slice(container_type, &emitter.module.types) {
+				fmt.sbprintf(
+					&emitter.builder,
+					"  %%v%d = extractvalue %s %%v%d, 0\n",
+					instruction_index, llvm_type(container_type, &emitter.module.types), instruction.a,
+				)
+			} else {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid container pointer")
+			}
+		case .Unwrap:
+			optional_type := instructions[instruction.a].type if valid_instruction(instructions, instruction.a) else types.INVALID
+			item, ok := types.node(&emitter.module.types, optional_type)
+			if !ok || item.kind != .Optional || !types.equal(item.child, instruction.type) {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid optional unwrap")
+				continue
+			}
+			if types.is_pointer(item.child, &emitter.module.types) {
+				fmt.sbprintf(&emitter.builder, "  %%optional_ok%d = icmp ne ptr %%v%d, null\n", instruction_index, instruction.a)
+			} else {
+				fmt.sbprintf(&emitter.builder, "  %%optional_ok%d = extractvalue %s %%v%d, 0\n", instruction_index, llvm_type(optional_type, &emitter.module.types), instruction.a)
+			}
+			fmt.sbprintf(&emitter.builder, "  br i1 %%optional_ok%d, label %%optional_continue%d, label %%optional_trap%d\noptional_trap%d:\n", instruction_index, instruction_index, instruction_index, instruction_index)
+			message := diagnostic_message(emitter, source.INVALID_DIAGNOSTIC, instruction.span, "attempted to unwrap none")
+			emit_trap_call(emitter, message)
+			fmt.sbprintf(&emitter.builder, "  unreachable\noptional_continue%d:\n", instruction_index)
+			if types.is_pointer(item.child, &emitter.module.types) {
+				fmt.sbprintf(&emitter.builder, "  %%v%d = select i1 true, ptr %%v%d, ptr null\n", instruction_index, instruction.a)
+			} else {
+				fmt.sbprintf(&emitter.builder, "  %%v%d = extractvalue %s %%v%d, 1\n", instruction_index, llvm_type(optional_type, &emitter.module.types), instruction.a)
+			}
+		case .Orelse_Begin:
+			optional_type := instructions[instruction.a].type if valid_instruction(instructions, instruction.a) else types.INVALID
+			item, ok := types.node(&emitter.module.types, optional_type)
+			if !ok || item.kind != .Optional || !types.equal(item.child, instruction.type) ||
+			   !valid_value(instructions, instruction.a, optional_type, &emitter.module.types) {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid optional fallback")
+				continue
+			}
+			fmt.sbprintf(&emitter.builder, "  %%orelse_slot%d = alloca %s\n", instruction_index, llvm_type(instruction.type, &emitter.module.types))
+			if types.is_pointer(item.child, &emitter.module.types) {
+				fmt.sbprintf(&emitter.builder, "  %%orelse_ok%d = icmp ne ptr %%v%d, null\n", instruction_index, instruction.a)
+			} else {
+				fmt.sbprintf(&emitter.builder, "  %%orelse_ok%d = extractvalue %s %%v%d, 0\n", instruction_index, llvm_type(optional_type, &emitter.module.types), instruction.a)
+			}
+			fmt.sbprintf(
+				&emitter.builder,
+				"  br i1 %%orelse_ok%d, label %%orelse_some%d, label %%orelse_fallback%d\norelse_fallback%d:\n",
+				instruction_index, instruction_index, instruction_index, instruction_index,
+			)
+		case .Orelse:
+			begin := instructions[instruction.a] if valid_instruction(instructions, instruction.a) else ir.Instruction{}
+			optional_type := instructions[begin.a].type if valid_instruction(instructions, begin.a) else types.INVALID
+			item, ok := types.node(&emitter.module.types, optional_type)
+			if begin.op != .Orelse_Begin || !ok || item.kind != .Optional || !types.equal(item.child, instruction.type) ||
+			   !valid_value(instructions, instruction.b, instruction.type, &emitter.module.types) {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid optional fallback")
+				continue
+			}
+			type_name := llvm_type(instruction.type, &emitter.module.types)
+			fmt.sbprintf(&emitter.builder, "  store %s ", type_name)
+			write_operand(&emitter.builder, instructions, instruction.b, instruction.type, &emitter.module.types)
+			fmt.sbprintf(&emitter.builder, ", ptr %%orelse_slot%d\n", instruction.a)
+			fmt.sbprintf(&emitter.builder, "  br label %%orelse_merge%d\norelse_some%d:\n", instruction.a, instruction.a)
+			if types.is_pointer(item.child, &emitter.module.types) {
+				fmt.sbprintf(&emitter.builder, "  store ptr %%v%d, ptr %%orelse_slot%d\n", begin.a, instruction.a)
+			} else {
+				fmt.sbprintf(&emitter.builder, "  %%orelse_value%d = extractvalue %s %%v%d, 1\n", instruction.a, llvm_type(optional_type, &emitter.module.types), begin.a)
+				fmt.sbprintf(&emitter.builder, "  store %s %%orelse_value%d, ptr %%orelse_slot%d\n", type_name, instruction.a, instruction.a)
+			}
+			fmt.sbprintf(&emitter.builder, "  br label %%orelse_merge%d\norelse_merge%d:\n", instruction.a, instruction.a)
+			fmt.sbprintf(&emitter.builder, "  %%v%d = load %s, ptr %%orelse_slot%d\n", instruction_index, type_name, instruction.a)
 		case .Widen:
 			if !valid_instruction(instructions, instruction.a) ||
-			   !types.is_concrete_integer(instructions[instruction.a].type) ||
+			   !types.can_widen(instructions[instruction.a].type, instruction.type) {
-			   !types.is_concrete_integer(instruction.type) ||
-			   instructions[instruction.a].type.bits >= instruction.type.bits {
 				emit_recovery_value(emitter, instruction_index, instruction, "invalid widening operand")
 				continue
 			}
 			from_type := instructions[instruction.a].type
-			fmt.sbprintf(&emitter.builder, "  %%v%d = sext %s ", instruction_index, llvm_type(from_type))
+			operation := "fpext" if types.is_float(from_type, emitter.module.target) else ("sext" if types.is_signed(from_type, emitter.module.target) else "zext")
-			write_operand(&emitter.builder, instructions, instruction.a, from_type)
+			fmt.sbprintf(&emitter.builder, "  %%v%d = %s %s ", instruction_index, operation, llvm_type(from_type, &emitter.module.types))
-			fmt.sbprintf(&emitter.builder, " to %s\n", llvm_type(instruction.type))
+			write_operand(&emitter.builder, instructions, instruction.a, from_type, &emitter.module.types)
+			fmt.sbprintf(&emitter.builder, " to %s\n", llvm_type(instruction.type, &emitter.module.types))
 		case .Neg_Checked:
-			if !valid_value(instructions, instruction.a, instruction.type) {
+			if !valid_value(instructions, instruction.a, instruction.type, &emitter.module.types) {
 				emit_recovery_value(emitter, instruction_index, instruction, "invalid negation operand")
 				continue
 			}
-			type_name := llvm_type(instruction.type)
+			type_name := llvm_type(instruction.type, &emitter.module.types)
+			if types.is_float(instruction.type, emitter.module.target) {
+				fmt.sbprintf(&emitter.builder, "  %%v%d = fneg %s ", instruction_index, type_name)
+				write_operand(&emitter.builder, instructions, instruction.a, instruction.type, &emitter.module.types)
+				strings.write_string(&emitter.builder, "\n")
+				continue
+			}
 			fmt.sbprintf(&emitter.builder, "  %%pair%d = call ", instruction_index)
 			strings.write_string(&emitter.builder, "{ ")
 			fmt.sbprintf(&emitter.builder, "%s, i1 } @llvm.ssub.with.overflow.%s(%s 0, %s ", type_name, type_name, type_name, type_name)
-			write_operand(&emitter.builder, instructions, instruction.a, instruction.type)
+			write_operand(&emitter.builder, instructions, instruction.a, instruction.type, &emitter.module.types)
 			fmt.sbprintf(&emitter.builder, ")\n")
 			fmt.sbprintf(&emitter.builder, "  %%v%d = extractvalue ", instruction_index)
 			strings.write_string(&emitter.builder, "{ ")
@@ -263,18 +742,27 @@ emit_instruction_stream :: proc(
 			emit_trap_call(emitter, message)
 			fmt.sbprintf(&emitter.builder, "  unreachable\noverflow_continue%d:\n", instruction_index)
 		case .Add_Checked:
-			if !valid_value(instructions, instruction.a, instruction.type) ||
+			if !valid_value(instructions, instruction.a, instruction.type, &emitter.module.types) ||
-			   !valid_value(instructions, instruction.b, instruction.type) {
+			   !valid_value(instructions, instruction.b, instruction.type, &emitter.module.types) {
 				emit_recovery_value(emitter, instruction_index, instruction, "invalid addition operand")
 				continue
 			}
-			type_name := llvm_type(instruction.type)
+			type_name := llvm_type(instruction.type, &emitter.module.types)
+			if types.is_float(instruction.type, emitter.module.target) {
+				fmt.sbprintf(&emitter.builder, "  %%v%d = fadd %s ", instruction_index, type_name)
+				write_operand(&emitter.builder, instructions, instruction.a, instruction.type, &emitter.module.types)
+				strings.write_string(&emitter.builder, ", ")
+				write_operand(&emitter.builder, instructions, instruction.b, instruction.type, &emitter.module.types)
+				strings.write_string(&emitter.builder, "\n")
+				continue
+			}
+			intrinsic := "uadd" if types.is_unsigned(instruction.type, emitter.module.target) else "sadd"
 			fmt.sbprintf(&emitter.builder, "  %%pair%d = call ", instruction_index)
 			strings.write_string(&emitter.builder, "{ ")
-			fmt.sbprintf(&emitter.builder, "%s, i1 } @llvm.sadd.with.overflow.%s(%s ", type_name, type_name, type_name)
+			fmt.sbprintf(&emitter.builder, "%s, i1 } @llvm.%s.with.overflow.%s(%s ", type_name, intrinsic, type_name, type_name)
-			write_operand(&emitter.builder, instructions, instruction.a, instruction.type)
+			write_operand(&emitter.builder, instructions, instruction.a, instruction.type, &emitter.module.types)
 			fmt.sbprintf(&emitter.builder, ", %s ", type_name)
-			write_operand(&emitter.builder, instructions, instruction.b, instruction.type)
+			write_operand(&emitter.builder, instructions, instruction.b, instruction.type, &emitter.module.types)
 			fmt.sbprintf(&emitter.builder, ")\n")
 			fmt.sbprintf(&emitter.builder, "  %%v%d = extractvalue ", instruction_index)
 			strings.write_string(&emitter.builder, "{ ")
@@ -290,9 +778,20 @@ emit_instruction_stream :: proc(
 				instruction_index,
 			)
 			fmt.sbprintf(&emitter.builder, "overflow_trap%d:\n", instruction_index)
-			message := diagnostic_message(emitter, source.INVALID_DIAGNOSTIC, instruction.span, "signed integer addition overflow")
+			message := diagnostic_message(emitter, source.INVALID_DIAGNOSTIC, instruction.span, "integer addition overflow")
 			emit_trap_call(emitter, message)
 			fmt.sbprintf(&emitter.builder, "  unreachable\noverflow_continue%d:\n", instruction_index)
+		case .Pointer_Add:
+			item, ok := types.node(&emitter.module.types, instruction.type)
+			if !ok || item.kind != .Pointer || !item.many ||
+			   !valid_value(instructions, instruction.a, instruction.type, &emitter.module.types) ||
+			   !valid_value(instructions, instruction.b, types.USIZE, &emitter.module.types) {
+				emit_recovery_value(emitter, instruction_index, instruction, "invalid pointer offset")
+				continue
+			}
+			fmt.sbprintf(&emitter.builder, "  %%v%d = getelementptr %s, ptr %%v%d, i64 ", instruction_index, llvm_type(item.child, &emitter.module.types), instruction.a)
+			write_operand(&emitter.builder, instructions, instruction.b, types.USIZE, &emitter.module.types)
+			strings.write_string(&emitter.builder, "\n")
 		case .Call:
 			function_id := ir.as_function(instruction.target)
 			if function_id == ir.INVALID_FUNCTION || int(function_id) >= len(emitter.module.functions) {
@@ -303,7 +802,7 @@ emit_instruction_stream :: proc(
 			valid_args := len(instruction.args) == len(target.param_types)
 			if valid_args {
 				for arg, index in instruction.args {
-					if !valid_value(instructions, arg, target.param_types[index]) {
+					if !valid_value(instructions, arg, target.param_types[index], &emitter.module.types) {
 						valid_args = false
 						break
 					}
@@ -317,7 +816,7 @@ emit_instruction_stream :: proc(
 				emit_recovery_value(emitter, instruction_index, instruction, "invalid function call operands")
 				continue
 			}
-			if instruction.type.kind != .Void {
+			if !types.is_void(instruction.type) {
 				fmt.sbprintf(&emitter.builder, "  %%v%d = ", instruction_index)
 			} else {
 				strings.write_string(&emitter.builder, "  ")
@@ -326,8 +825,12 @@ emit_instruction_stream :: proc(
 			if target.calling_convention == .Brolang {
 				strings.write_string(&emitter.builder, "fastcc ")
 			}
-			fmt.sbprintf(&emitter.builder, "%s @%s(", function_result_type(target), target.link_name)
+			emit_function_result(&emitter.builder, target, &emitter.module.types)
-			emit_call_args(&emitter.builder, instructions, instruction.args, target.param_types)
+			fmt.sbprintf(&emitter.builder, " @%s(", target.link_name)
+			emit_call_args(
+				&emitter.builder, instructions, instruction.args, target.param_types,
+				&emitter.module.types, target.calling_convention == .C,
+			)
 			strings.write_string(&emitter.builder, ")\n")
 		case .Trap:
 			message := diagnostic_message(emitter, instruction.diagnostic, instruction.span, "invalid recovered source")
@@ -337,8 +840,8 @@ emit_instruction_stream :: proc(
 				return_value = instruction.a
 				continue
 			}
-			fmt.sbprintf(&emitter.builder, "  ret %s ", function_result_type(function))
+			fmt.sbprintf(&emitter.builder, "  ret %s ", function_result_type(function, &emitter.module.types))
-			write_operand(&emitter.builder, instructions, instruction.a, function.result)
+			write_operand(&emitter.builder, instructions, instruction.a, function.result, &emitter.module.types)
 			strings.write_string(&emitter.builder, "\n")
 			after_return = true
 		case .Return_Void:
@@ -361,17 +864,18 @@ emit_globals :: proc(emitter: ^Emitter) {
 		if global.is_static {
 			fmt.sbprintf(
 				&emitter.builder,
-				"@bro.g.%d = internal constant %s %d\n",
+				"@bro.g.%d = internal constant %s ",
 				global_id,
-				llvm_type(global.type),
+				llvm_type(global.type, &emitter.module.types),
-				global.static_value,
 			)
+			write_constant(&emitter.builder, global.static_value, global.type, &emitter.module.types)
+			strings.write_string(&emitter.builder, "\n")
 		} else {
 			fmt.sbprintf(
 				&emitter.builder,
-				"@bro.g.%d = internal global %s 0\n@bro.gstate.%d = internal global i8 0\n",
+				"@bro.g.%d = internal global %s zeroinitializer\n@bro.gstate.%d = internal global i8 0\n",
 				global_id,
-				llvm_type(global.type),
+				llvm_type(global.type, &emitter.module.types),
 				global_id,
 			)
 		}
@@ -379,13 +883,53 @@ emit_globals :: proc(emitter: ^Emitter) {
 	strings.write_string(&emitter.builder, "\n")
 }
 
+emit_types :: proc(emitter: ^Emitter) {
+	for item, index in emitter.module.types.nodes {
+		if item.kind != .Struct {
+			continue
+		}
+		id := types.DYNAMIC_START+types.Type(index)
+		fmt.sbprintf(&emitter.builder, "%%bro.type.%d = type ", id)
+		if item.opaque {
+			strings.write_string(&emitter.builder, "opaque\n")
+			continue
+		}
+		strings.write_string(&emitter.builder, "{ ")
+		for field, field_index in types.fields_for(&emitter.module.types, id) {
+			if field_index > 0 {
+				strings.write_string(&emitter.builder, ", ")
+			}
+			strings.write_string(&emitter.builder, llvm_type(field.type, &emitter.module.types))
+		}
+		strings.write_string(&emitter.builder, " }\n")
+	}
+	if len(emitter.module.types.nodes) > 0 {
+		strings.write_string(&emitter.builder, "\n")
+	}
+}
+
+emit_strings :: proc(emitter: ^Emitter) {
+	for value, id in emitter.module.strings {
+		fmt.sbprintf(
+			&emitter.builder,
+			"@bro.str.%d = private unnamed_addr constant [%d x i8] c\"",
+			id, len(value)+1,
+		)
+		emit_escaped_bytes(&emitter.builder, value)
+		strings.write_string(&emitter.builder, "\\00\"\n")
+	}
+	if len(emitter.module.strings) > 0 {
+		strings.write_string(&emitter.builder, "\n")
+	}
+}
+
 emit_global_accessors :: proc(emitter: ^Emitter) {
 	placeholder_function := ir.Function{result=types.I64}
 	for global, global_id in emitter.module.globals {
 		if global.is_static {
 			continue
 		}
-		type_name := llvm_type(global.type)
+		type_name := llvm_type(global.type, &emitter.module.types)
 		fmt.sbprintf(&emitter.builder, "define internal %s @bro.get.%d() ", type_name, global_id)
 		strings.write_string(&emitter.builder, "{\nentry:\n")
 		fmt.sbprintf(
@@ -407,11 +951,11 @@ emit_global_accessors :: proc(emitter: ^Emitter) {
 		placeholder_function.result = global.type
 		value := emit_instruction_stream(emitter, global.initializer, placeholder_function, true)
 		fmt.sbprintf(&emitter.builder, "  store %s ", type_name)
-		write_operand(&emitter.builder, global.initializer, value, global.type)
+		write_operand(&emitter.builder, global.initializer, value, global.type, &emitter.module.types)
 		fmt.sbprintf(&emitter.builder, ", ptr @bro.g.%d\n", global_id)
 		fmt.sbprintf(&emitter.builder, "  store i8 2, ptr @bro.gstate.%d\n", global_id)
 		fmt.sbprintf(&emitter.builder, "  ret %s ", type_name)
-		write_operand(&emitter.builder, global.initializer, value, global.type)
+		write_operand(&emitter.builder, global.initializer, value, global.type, &emitter.module.types)
 		strings.write_string(&emitter.builder, "\nready:\n")
 		fmt.sbprintf(&emitter.builder, "  %%value = load %s, ptr @bro.g.%d\n  ret %s %%value\n}\n\n", type_name, global_id, type_name)
 	}
@@ -434,7 +978,7 @@ emit_constructor :: proc(emitter: ^Emitter) {
 	strings.write_string(&emitter.builder, "define internal void @bro.init() {\nentry:\n")
 	for global, global_id in emitter.module.globals {
 		if !global.is_static && !global.problematic {
-			fmt.sbprintf(&emitter.builder, "  %%g%d = call %s @bro.get.%d()\n", global_id, llvm_type(global.type), global_id)
+			fmt.sbprintf(&emitter.builder, "  %%g%d = call %s @bro.get.%d()\n", global_id, llvm_type(global.type, &emitter.module.types), global_id)
 		}
 	}
 	strings.write_string(&emitter.builder, "  ret void\n}\n\n")
@@ -453,15 +997,25 @@ emit_functions :: proc(emitter: ^Emitter) {
 		if function.calling_convention == .Brolang {
 			strings.write_string(&emitter.builder, "fastcc ")
 		}
-		fmt.sbprintf(&emitter.builder, "%s @%s(", function_result_type(function), function.link_name)
+		emit_function_result(&emitter.builder, function, &emitter.module.types)
+		fmt.sbprintf(&emitter.builder, " @%s(", function.link_name)
 		for param_type, index in function.param_types {
 			if index > 0 {
 				strings.write_string(&emitter.builder, ", ")
 			}
 			if function.implementation == .Declaration {
-				fmt.sbprintf(&emitter.builder, "%s", llvm_type(param_type))
+				fmt.sbprintf(&emitter.builder, "%s", llvm_type(param_type, &emitter.module.types))
 			} else {
-				fmt.sbprintf(&emitter.builder, "%s %%v%d", llvm_type(param_type), index)
+				fmt.sbprintf(&emitter.builder, "%s", llvm_type(param_type, &emitter.module.types))
+			}
+			if function.calling_convention == .C {
+				extension := c_abi_extension(param_type, emitter.module.target)
+				if len(extension) > 0 {
+					fmt.sbprintf(&emitter.builder, " %s", extension)
+				}
+			}
+			if function.implementation != .Declaration {
+				fmt.sbprintf(&emitter.builder, " %%v%d", index)
 			}
 		}
 		if function.implementation == .Declaration {
@@ -503,6 +1057,10 @@ emit_declarations :: proc(emitter: ^Emitter) {
 		fmt.sbprintf(&emitter.builder, "%d(i%d, i%d)\n", bits, bits, bits)
 		strings.write_string(&emitter.builder, "declare { i")
 		fmt.sbprintf(&emitter.builder, "%d", bits)
+		strings.write_string(&emitter.builder, ", i1 } @llvm.uadd.with.overflow.i")
+		fmt.sbprintf(&emitter.builder, "%d(i%d, i%d)\n", bits, bits, bits)
+		strings.write_string(&emitter.builder, "declare { i")
+		fmt.sbprintf(&emitter.builder, "%d", bits)
 		strings.write_string(&emitter.builder, ", i1 } @llvm.ssub.with.overflow.i")
 		fmt.sbprintf(&emitter.builder, "%d(i%d, i%d)\n", bits, bits, bits)
 	}
@@ -534,7 +1092,11 @@ emit :: proc(
 		strings.builder_destroy(&emitter.builder)
 	}
 
-	strings.write_string(&emitter.builder, "; generated by brolang\n\n")
+	strings.write_string(&emitter.builder, "; generated by brolang\n")
+	fmt.sbprintf(&emitter.builder, "target datalayout = \"%s\"\n", target.llvm_data_layout(module.target))
+	fmt.sbprintf(&emitter.builder, "target triple = \"%s\"\n\n", target.llvm_triple(module.target))
+	emit_types(&emitter)
+	emit_strings(&emitter)
 	emit_globals(&emitter)
 	emit_constructor(&emitter)
 	emit_global_accessors(&emitter)

compiler/loader/loader.odin

@@ -5,6 +5,7 @@ import "../lexer"
 import "../parser"
 import "../source"
 import "../symbol"
+import "../types"
 import "core:mem"
 import "core:os"
 import "core:path/filepath"
@@ -253,6 +254,92 @@ validate_imports :: proc(state: ^State) {
 	}
 }
 
+find_type_import :: proc(module: ^ast.Module, file: ast.File_Id, alias: symbol.Id) -> ast.Import_Id {
+	for import_item, index in module.imports {
+		if import_item.file == file && import_item.alias == alias {
+			return ast.import_id(index)
+		}
+	}
+	return ast.INVALID_IMPORT
+}
+
+canonical_type :: proc(
+	module: ^ast.Module,
+	value: types.Type,
+	mapping: []types.Type,
+	visiting: []bool,
+) -> types.Type {
+	if value < types.DYNAMIC_START {
+		return value
+	}
+	index := int(value-types.DYNAMIC_START)
+	if index < 0 || index >= len(mapping) {
+		return value
+	}
+	if types.is_valid(mapping[index]) {
+		return mapping[index]
+	}
+	if visiting[index] {
+		return value
+	}
+	visiting[index] = true
+	defer visiting[index] = false
+	item := module.type_store.nodes[index]
+	if item.kind == .Named {
+		if item.qualifier != 0 {
+			import_id := find_type_import(module, ast.File_Id(item.file), symbol.Id(item.qualifier))
+			if import_id != ast.INVALID_IMPORT {
+				module.imports[import_id].used = true
+				import_item := module.imports[import_id]
+				resolved := types.find_named(&module.type_store, u32(import_item.target), item.name)
+				if types.is_valid(resolved) {
+					mapping[index] = resolved
+					return resolved
+				}
+			}
+		}
+		mapping[index] = value
+		return value
+	}
+	if item.kind == .Struct {
+		mapping[index] = value
+		fields := types.fields_for(&module.type_store, value)
+		for &field in fields {
+			field.type = canonical_type(module, field.type, mapping, visiting)
+		}
+		return value
+	}
+	if types.is_valid(item.child) {
+		item.child = canonical_type(module, item.child, mapping, visiting)
+	}
+	resolved := types.intern(&module.type_store, item)
+	mapping[index] = resolved
+	return resolved
+}
+
+canonicalize_types :: proc(module: ^ast.Module, allocator: mem.Allocator) {
+	original_count := len(module.type_store.nodes)
+	mapping := make([]types.Type, original_count, allocator)
+	visiting := make([]bool, original_count, allocator)
+	defer delete(mapping, allocator)
+	defer delete(visiting, allocator)
+	for &function in module.functions {
+		for &param in function.params {
+			param.type = canonical_type(module, param.type, mapping, visiting)
+		}
+		function.result = canonical_type(module, function.result, mapping, visiting)
+	}
+	for &global in module.globals {
+		global.type = canonical_type(module, global.type, mapping, visiting)
+	}
+	for &statement in module.statements {
+		statement.type = canonical_type(module, statement.type, mapping, visiting)
+	}
+	for index := 0; index < original_count; index += 1 {
+		_ = canonical_type(module, types.DYNAMIC_START+types.Type(index), mapping, visiting)
+	}
+}
+
 load :: proc(
 	root_path: string,
 	sources: ^source.Store,
@@ -275,5 +362,6 @@ load :: proc(
 		state.root_failed = true
 	}
 	validate_imports(&state)
+	canonicalize_types(&module, allocator)
 	return module, !state.root_failed
 }

compiler/lower/lower.odin

@@ -3,6 +3,7 @@ package lower
 import "../hir"
 import "../ir"
 import "../source"
+import "../target"
 import "../types"
 import "core:fmt"
 import "core:mem"
@@ -28,8 +29,11 @@ clone_args :: proc(values: []ir.Instruction_Id, allocator: mem.Allocator) -> []i
 	return result
 }
 
-sentinel :: proc(value_type: types.Type) -> i64 {
+sentinel :: proc(value_type: types.Type, selected := target.DEFAULT) -> i64 {
-	switch value_type.bits {
+	if types.is_float(value_type, selected) {
+		return i64(0x7fc0_0000) if types.bits(value_type, selected) == 32 else transmute(i64)u64(0x7ff8_0000_0000_0000)
+	}
+	switch types.bits(value_type, selected) {
 	case 8:  return -86
 	case 16: return -21846
 	case 32: return -1431655766
@@ -53,14 +57,14 @@ append_recovery_value :: proc(
 		diagnostic=diagnostic,
 	})
 	fallback := value_type
-	if !types.is_concrete_integer(fallback) {
+	if !types.is_valid(fallback) {
 		fallback = types.I64
 	}
 	return append_instruction(state, ir.Instruction{
 		op=.Const,
 		span=span,
 		type=fallback,
-		integer=sentinel(fallback),
+		integer=sentinel(fallback, state.hir_module.target),
 		target=ir.INVALID_REF,
 		a=ir.INVALID_INSTRUCTION,
 		b=ir.INVALID_INSTRUCTION,
@@ -76,6 +80,187 @@ Lower_Expr_Frame :: struct {
 	args:      []ir.Instruction_Id,
 }
 
+lower_nested_expr :: proc(state: ^State, expr_id: hir.Expr_Id) -> ir.Instruction_Id {
+	outer := state.expr_stack
+	state.expr_stack = nil
+	state.expr_stack.allocator = state.allocator
+	result := lower_expr(state, expr_id)
+	delete(state.expr_stack)
+	state.expr_stack = outer
+	return result
+}
+
+lower_location :: proc(state: ^State, expr_id: hir.Expr_Id, for_write := false) -> ir.Instruction_Id {
+	if expr_id == hir.INVALID_EXPR || int(expr_id) >= len(state.hir_module.exprs) {
+		return ir.INVALID_INSTRUCTION
+	}
+	expr := state.hir_module.exprs[expr_id]
+	#partial switch expr.kind {
+	case .Local:
+		local := hir.as_local(expr.target)
+		if local != hir.INVALID_LOCAL && int(local) < len(state.local_slots) {
+			return state.local_slots[local]
+		}
+	case .Global:
+		global := hir.as_global(expr.target)
+		if global != hir.INVALID_GLOBAL && int(global) < len(state.hir_module.globals) {
+			return append_instruction(state, ir.Instruction{
+				op=.Address_Global, span=expr.span, type=expr.type,
+				target=ir.global_ref(ir.Global_Id(global)),
+				a=ir.INVALID_INSTRUCTION, b=ir.INVALID_INSTRUCTION,
+				diagnostic=source.INVALID_DIAGNOSTIC,
+			})
+		}
+	case .Deref:
+		return lower_nested_expr(state, expr.left)
+	case .Index:
+		container_type := state.hir_module.exprs[expr.left].type
+		container := lower_nested_expr(state, expr.left)
+		if types.is_array(container_type, &state.hir_module.types) {
+			container = lower_location(state, expr.left, for_write)
+		}
+		index := lower_nested_expr(state, expr.right)
+		return append_instruction(state, ir.Instruction{
+			op=.Index_Address, span=expr.span, type=expr.type,
+			integer=0 if for_write else 1,
+			target=ir.INVALID_REF, a=container, b=index,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+	case .Field:
+		base_type := state.hir_module.exprs[expr.left].type
+		base := lower_nested_expr(state, expr.left)
+		if !types.is_pointer(base_type, &state.hir_module.types) {
+			base = lower_location(state, expr.left, for_write)
+		}
+		return append_instruction(state, ir.Instruction{
+			op=.Field_Address, span=expr.span, type=expr.type, integer=expr.integer,
+			target=ir.INVALID_REF, a=base, b=ir.INVALID_INSTRUCTION,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+	}
+	return ir.INVALID_INSTRUCTION
+}
+
+lower_compound_expr :: proc(state: ^State, expr_id: hir.Expr_Id) -> ir.Instruction_Id {
+	expr := state.hir_module.exprs[expr_id]
+	#partial switch expr.kind {
+	case .String:
+		return append_instruction(state, ir.Instruction{
+			op=.String, span=expr.span, type=expr.type, integer=expr.integer,
+			target=ir.INVALID_REF, a=ir.INVALID_INSTRUCTION, b=ir.INVALID_INSTRUCTION,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+	case .Array, .Struct:
+		args := make([]ir.Instruction_Id, len(expr.args), state.allocator)
+		for arg, index in expr.args {
+			args[index] = lower_nested_expr(state, arg)
+		}
+		return append_instruction(state, ir.Instruction{
+			op=.Aggregate, span=expr.span, type=expr.type, args=args,
+			target=ir.INVALID_REF, a=ir.INVALID_INSTRUCTION, b=ir.INVALID_INSTRUCTION,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+	case .None:
+		return append_instruction(state, ir.Instruction{
+			op=.None, span=expr.span, type=expr.type,
+			target=ir.INVALID_REF, a=ir.INVALID_INSTRUCTION, b=ir.INVALID_INSTRUCTION,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+	case .Optional_Some:
+		value := lower_nested_expr(state, expr.left)
+		return append_instruction(state, ir.Instruction{
+			op=.Optional_Some, span=expr.span, type=expr.type,
+			target=ir.INVALID_REF, a=value, b=ir.INVALID_INSTRUCTION,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+	case .Address:
+		location := lower_location(state, expr.left, types.is_mutable(expr.type, &state.hir_module.types))
+		if location != ir.INVALID_INSTRUCTION {
+			return append_instruction(state, ir.Instruction{
+				op=.Address_Of, span=expr.span, type=expr.type,
+				target=ir.INVALID_REF, a=location, b=ir.INVALID_INSTRUCTION,
+				diagnostic=source.INVALID_DIAGNOSTIC,
+			})
+		}
+		return append_recovery_value(state, expr.span, expr.type, expr.diagnostic)
+	case .Deref, .Index, .Field:
+		location := lower_location(state, expr_id)
+		if location == ir.INVALID_INSTRUCTION {
+			return append_recovery_value(state, expr.span, expr.type, expr.diagnostic)
+		}
+		return append_instruction(state, ir.Instruction{
+			op=.Load, span=expr.span, type=expr.type,
+			target=ir.INVALID_REF, a=location, b=ir.INVALID_INSTRUCTION,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+	case .Slice:
+		container := lower_nested_expr(state, expr.left)
+		if types.is_array(state.hir_module.exprs[expr.left].type, &state.hir_module.types) {
+			container = lower_location(state, expr.left)
+		}
+		args := make([]ir.Instruction_Id, len(expr.args), state.allocator)
+		for arg, index in expr.args {
+			args[index] = ir.INVALID_INSTRUCTION
+			if arg != hir.INVALID_EXPR {
+				args[index] = lower_nested_expr(state, arg)
+			}
+		}
+		return append_instruction(state, ir.Instruction{
+			op=.Slice, span=expr.span, type=expr.type, args=args,
+			target=ir.INVALID_REF, a=container, b=ir.INVALID_INSTRUCTION,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+	case .Unwrap:
+		value := lower_nested_expr(state, expr.left)
+		return append_instruction(state, ir.Instruction{
+			op=.Unwrap, span=expr.span, type=expr.type,
+			target=ir.INVALID_REF, a=value, b=ir.INVALID_INSTRUCTION,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+	case .Length:
+		container_type := state.hir_module.exprs[expr.left].type
+		item, ok := types.node(&state.hir_module.types, container_type)
+		if ok && item.kind == .Array {
+			return append_instruction(state, ir.Instruction{
+				op=.Const, span=expr.span, type=types.USIZE, integer=i64(item.count),
+				target=ir.INVALID_REF, a=ir.INVALID_INSTRUCTION, b=ir.INVALID_INSTRUCTION,
+				diagnostic=source.INVALID_DIAGNOSTIC,
+			})
+		}
+		value := lower_nested_expr(state, expr.left)
+		return append_instruction(state, ir.Instruction{
+			op=.Length, span=expr.span, type=types.USIZE,
+			target=ir.INVALID_REF, a=value, b=ir.INVALID_INSTRUCTION,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+	case .Slice_Ptr:
+		container_type := state.hir_module.exprs[expr.left].type
+		value := lower_nested_expr(state, expr.left)
+		if types.is_array(container_type, &state.hir_module.types) {
+			value = lower_location(state, expr.left)
+		}
+		return append_instruction(state, ir.Instruction{
+			op=.Slice_Ptr, span=expr.span, type=expr.type,
+			target=ir.INVALID_REF, a=value, b=ir.INVALID_INSTRUCTION,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+	case .Orelse:
+		value := lower_nested_expr(state, expr.left)
+		begin := append_instruction(state, ir.Instruction{
+			op=.Orelse_Begin, span=expr.span, type=expr.type,
+			target=ir.INVALID_REF, a=value, b=ir.INVALID_INSTRUCTION,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+		fallback := lower_nested_expr(state, expr.right)
+		return append_instruction(state, ir.Instruction{
+			op=.Orelse, span=expr.span, type=expr.type,
+			target=ir.INVALID_REF, a=begin, b=fallback,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+	}
+	return append_recovery_value(state, expr.span, expr.type, expr.diagnostic)
+}
+
 lower_expr :: proc(state: ^State, expr_id: hir.Expr_Id) -> ir.Instruction_Id {
 	stack := state.expr_stack
 	clear_dynamic_array(&stack)
@@ -98,16 +283,20 @@ lower_expr :: proc(state: ^State, expr_id: hir.Expr_Id) -> ir.Instruction_Id {
 		}
 		expr := state.hir_module.exprs[frame.expr]
 		if frame.stage == 0 {
-			switch expr.kind {
+			#partial switch expr.kind {
 			case .Invalid:
 				last = append_recovery_value(state, expr.span, expr.type, expr.diagnostic)
 				_ = pop(&stack)
-			case .Integer:
+			case .Integer, .Float:
 				last = append_instruction(state, ir.Instruction{
 					op=.Const, span=expr.span, type=expr.type, integer=expr.integer,
 					target=ir.INVALID_REF, a=ir.INVALID_INSTRUCTION, b=ir.INVALID_INSTRUCTION, diagnostic=source.INVALID_DIAGNOSTIC,
 				})
 				_ = pop(&stack)
+			case .String, .Array, .Struct, .None, .Optional_Some, .Address, .Deref,
+			     .Index, .Slice, .Field, .Length, .Slice_Ptr, .Unwrap, .Orelse:
+				last = lower_compound_expr(state, frame.expr)
+				_ = pop(&stack)
 			case .Local:
 				last = ir.INVALID_INSTRUCTION
 				local := hir.as_local(expr.target)
@@ -141,7 +330,7 @@ lower_expr :: proc(state: ^State, expr_id: hir.Expr_Id) -> ir.Instruction_Id {
 			case .Negate:
 				stack[frame_index].stage = 5
 				append(&stack, Lower_Expr_Frame{expr=expr.left})
-			case .Add:
+			case .Add, .Pointer_Add:
 				stack[frame_index].stage = 2
 				append(&stack, Lower_Expr_Frame{expr=expr.left})
 			case .Call:
@@ -183,7 +372,8 @@ lower_expr :: proc(state: ^State, expr_id: hir.Expr_Id) -> ir.Instruction_Id {
 		}
 		if frame.stage == 3 {
 			last = append_instruction(state, ir.Instruction{
-				op=.Add_Checked, span=expr.span, type=expr.type, target=ir.INVALID_REF,
+				op=.Pointer_Add if expr.kind == .Pointer_Add else .Add_Checked,
+				span=expr.span, type=expr.type, target=ir.INVALID_REF,
 				a=frame.left, b=last, diagnostic=source.INVALID_DIAGNOSTIC,
 			})
 			_ = pop(&stack)
@@ -238,6 +428,20 @@ lower_body :: proc(hir_module: ^hir.Module, function: hir.Function, allocator: m
 		})
 		state.local_values[local_id] = param
 	}
+	for local_id in function.params {
+		slot := append_instruction(&state, ir.Instruction{
+			op=.Alloca, type=function.locals[local_id].type,
+			target=ir.local_ref(ir.Local_Id(local_id)),
+			a=ir.INVALID_INSTRUCTION, b=ir.INVALID_INSTRUCTION,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+		append_instruction(&state, ir.Instruction{
+			op=.Store, type=function.locals[local_id].type,
+			target=ir.INVALID_REF, a=slot, b=state.local_values[local_id],
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+		state.local_slots[local_id] = slot
+	}
 
 	for statement_id in function.body {
 		statement := hir_module.statements[statement_id]
@@ -252,36 +456,39 @@ lower_body :: proc(hir_module: ^hir.Module, function: hir.Function, allocator: m
 				continue
 			}
 			local := function.locals[statement.local]
-			if local.mutable {
+			slot := append_instruction(&state, ir.Instruction{
-				slot := append_instruction(&state, ir.Instruction{
+				op=.Alloca,
-					op=.Alloca,
+				span=statement.span,
-					span=statement.span,
+				type=local.type,
-					type=local.type,
+				target=ir.local_ref(ir.Local_Id(statement.local)),
-					target=ir.local_ref(ir.Local_Id(statement.local)),
+				a=ir.INVALID_INSTRUCTION,
-					a=ir.INVALID_INSTRUCTION,
+				b=ir.INVALID_INSTRUCTION,
-					b=ir.INVALID_INSTRUCTION,
+				diagnostic=source.INVALID_DIAGNOSTIC,
-					diagnostic=source.INVALID_DIAGNOSTIC,
+			})
-				})
+			state.local_slots[statement.local] = slot
-				state.local_slots[statement.local] = slot
+			append_instruction(&state, ir.Instruction{
-				append_instruction(&state, ir.Instruction{
+				op=.Store,
-					op=.Store,
+				span=statement.span,
-					span=statement.span,
+				type=local.type,
-					type=local.type,
+				target=ir.INVALID_REF,
-					target=ir.INVALID_REF,
+				a=slot,
-					a=slot,
+				b=value,
-					b=value,
+				diagnostic=source.INVALID_DIAGNOSTIC,
-					diagnostic=source.INVALID_DIAGNOSTIC,
+			})
-				})
-			} else {
-				state.local_values[statement.local] = value
-			}
 		case .Assignment:
 			value := lower_expr(&state, statement.expr)
 			slot := ir.INVALID_INSTRUCTION
-			if statement.local != hir.INVALID_LOCAL && int(statement.local) < len(state.local_slots) {
+			value_type := types.INVALID
+			if statement.target != hir.INVALID_EXPR {
+				slot = lower_location(&state, statement.target, true)
+				if int(statement.target) < len(hir_module.exprs) {
+					value_type = hir_module.exprs[statement.target].type
+				}
+			} else if statement.local != hir.INVALID_LOCAL && int(statement.local) < len(state.local_slots) {
 				slot = state.local_slots[statement.local]
+				value_type = function.locals[statement.local].type
 			}
-			if slot == ir.INVALID_INSTRUCTION || statement.local == hir.INVALID_LOCAL || int(statement.local) >= len(function.locals) {
+			if slot == ir.INVALID_INSTRUCTION || !types.is_valid(value_type) {
 				append_instruction(&state, ir.Instruction{
 					op=.Trap, span=statement.span, type=types.VOID,
 					target=ir.INVALID_REF, a=ir.INVALID_INSTRUCTION, b=ir.INVALID_INSTRUCTION, diagnostic=statement.diagnostic,
@@ -291,7 +498,7 @@ lower_body :: proc(hir_module: ^hir.Module, function: hir.Function, allocator: m
 			append_instruction(&state, ir.Instruction{
 				op=.Store,
 				span=statement.span,
-				type=function.locals[statement.local].type,
+				type=value_type,
 				target=ir.INVALID_REF,
 				a=slot,
 				b=value,
@@ -337,13 +544,13 @@ lower_body :: proc(hir_module: ^hir.Module, function: hir.Function, allocator: m
 	if len(state.instructions) == 0 ||
 	   (state.instructions[len(state.instructions)-1].op != .Return &&
 	    state.instructions[len(state.instructions)-1].op != .Return_Void) {
-		if function.result.kind == .Void {
+		if types.is_void(function.result) {
 			append_instruction(&state, ir.Instruction{op=.Return_Void, type=types.VOID, target=ir.INVALID_REF, a=ir.INVALID_INSTRUCTION, b=ir.INVALID_INSTRUCTION, diagnostic=source.INVALID_DIAGNOSTIC})
 		} else {
 			value := append_instruction(&state, ir.Instruction{
 				op=.Const,
 				type=function.result,
-				integer=sentinel(function.result),
+				integer=sentinel(function.result, hir_module.target),
 				target=ir.INVALID_REF,
 				a=ir.INVALID_INSTRUCTION,
 				b=ir.INVALID_INSTRUCTION,
@@ -373,7 +580,12 @@ lower_global_initializer :: proc(hir_module: ^hir.Module, global: hir.Global, al
 }
 
 lower :: proc(hir_module: ^hir.Module, allocator := context.allocator) -> ir.Module {
-	module := ir.init_module(allocator)
+	module := ir.init_module(hir_module.target, allocator)
+	types.destroy_store(&module.types)
+	module.types = types.clone_store(&hir_module.types, allocator)
+	for value in hir_module.strings {
+		append(&module.strings, fmt.aprintf("%s", value, allocator=allocator))
+	}
 	for global in hir_module.globals {
 		_ = ir.global_id(len(module.globals))
 		append(&module.globals, ir.Global{

compiler/parser/parser.odin

@@ -4,9 +4,12 @@ import "../ast"
 import "../source"
 import "../symbol"
 import "../token"
+import "../types"
 import "base:intrinsics"
 import "core:fmt"
+import "core:strconv"
 import "core:strings"
+import "core:unicode/utf8"
 
 Parser :: struct {
 	tokens:      ^token.Stream,
@@ -80,36 +83,225 @@ invalid_expr :: proc(parser: ^Parser, span: source.Span, message: string) -> ast
 
 is_type_token :: proc(kind: token.Kind) -> bool {
 	#partial switch kind {
-	case .Keyword_Int, .Keyword_I8, .Keyword_I16, .Keyword_I32, .Keyword_I64, .Keyword_Void:
+	case .Keyword_Int, .Keyword_I8, .Keyword_I16, .Keyword_I32, .Keyword_I64,
+	     .Keyword_U8, .Keyword_U16, .Keyword_U32, .Keyword_U64,
+	     .Keyword_Isize, .Keyword_Usize, .Keyword_F32, .Keyword_F64,
+	     .Keyword_C_Char, .Keyword_C_Schar, .Keyword_C_Uchar,
+	     .Keyword_C_Short, .Keyword_C_Ushort, .Keyword_C_Int, .Keyword_C_Uint,
+	     .Keyword_C_Long, .Keyword_C_Ulong, .Keyword_C_Longlong, .Keyword_C_Ulonglong,
+	     .Keyword_C_Float, .Keyword_C_Double, .Keyword_C_Longdouble,
+	     .Keyword_Void, .Identifier, .Question, .At, .Star, .Left_Bracket:
 		return true
 	}
 	return false
 }
 
+decode_character :: proc(parser: ^Parser, tok: token.Token) -> (u64, bool) {
+	text := token_text(parser, tok)
+	if len(text) < 3 {
+		return 0, false
+	}
+	contents := text[1:len(text)-1]
+	if len(contents) == 2 && contents[0] == '\\' {
+		switch contents[1] {
+		case '0':  return 0, true
+		case 'n':  return '\n', true
+		case 'r':  return '\r', true
+		case 't':  return '\t', true
+		case '\\': return '\\', true
+		case '\'': return '\'', true
+		}
+		return 0, false
+	}
+	value, width := utf8.decode_rune_in_string(contents)
+	return u64(value), width == len(contents)
+}
+
+parse_type_constant :: proc(parser: ^Parser) -> (u64, bool) {
+	negative := false
+	if _, ok := allow(parser, .Minus); ok {
+		negative = true
+	}
+	tok := current(parser)
+	if tok.kind == .Integer {
+		advance(parser)
+		value, ok := parse_integer_magnitude(token_text(parser, tok))
+		if !ok {
+			return 0, false
+		}
+		if negative {
+			return transmute(u64)-i64(value), true
+		}
+		return value, true
+	}
+	if !negative && tok.kind == .Character {
+		advance(parser)
+		return decode_character(parser, tok)
+	}
+	source.add(parser.diagnostics, tok.span, "expected an integer or character constant")
+	return 0, false
+}
+
 parse_type :: proc(parser: ^Parser) -> ast.Type_Syntax {
 	tok := current(parser)
+	if tok.kind == .Question {
+		advance(parser)
+		child := parse_type(parser)
+		return types.intern(&parser.module.type_store, types.Node{kind=.Optional, child=child})
+	}
+	if tok.kind == .At || tok.kind == .Star {
+		many := tok.kind == .Star
+		advance(parser)
+		_, mutable := allow(parser, .Keyword_Mut)
+		child := parse_type(parser)
+		return types.intern(&parser.module.type_store, types.Node{
+			kind=.Pointer,
+			child=child,
+			mutable=mutable,
+			many=many,
+		})
+	}
+	if tok.kind == .Left_Bracket {
+		advance(parser)
+		node := types.Node{}
+		if _, ok := allow(parser, .Right_Bracket); ok {
+			node.kind = .Slice
+		} else if _, ok := allow(parser, .Semicolon); ok {
+			node.kind = .Slice
+			node.has_sentinel = true
+			node.sentinel, _ = parse_type_constant(parser)
+			if _, ok = allow(parser, .Right_Bracket); !ok {
+				source.add(parser.diagnostics, current(parser).span, "expected ']' after sentinel slice type")
+			}
+		} else {
+			node.kind = .Array
+			if _, ok := allow(parser, .Underscore); ok {
+				node.inferred_count = true
+			} else {
+				count, ok := parse_type_constant(parser)
+				if ok {
+					node.count = count
+				}
+			}
+			if _, ok := allow(parser, .Semicolon); ok {
+				node.has_sentinel = true
+				node.sentinel, _ = parse_type_constant(parser)
+			}
+			if _, ok := allow(parser, .Right_Bracket); !ok {
+				source.add(parser.diagnostics, current(parser).span, "expected ']' after array type")
+			}
+		}
+		_, node.mutable = allow(parser, .Keyword_Mut)
+		node.child = parse_type(parser)
+		return types.intern(&parser.module.type_store, node)
+	}
 	#partial switch tok.kind {
 	case .Keyword_Int:
 		advance(parser)
-		return .Int
+		return types.INT
 	case .Keyword_I8:
 		advance(parser)
-		return .I8
+		return types.I8
 	case .Keyword_I16:
 		advance(parser)
-		return .I16
+		return types.I16
 	case .Keyword_I32:
 		advance(parser)
-		return .I32
+		return types.I32
 	case .Keyword_I64:
 		advance(parser)
-		return .I64
+		return types.I64
+	case .Keyword_U8:
+		advance(parser)
+		return types.U8
+	case .Keyword_U16:
+		advance(parser)
+		return types.U16
+	case .Keyword_U32:
+		advance(parser)
+		return types.U32
+	case .Keyword_U64:
+		advance(parser)
+		return types.U64
+	case .Keyword_Isize:
+		advance(parser)
+		return types.ISIZE
+	case .Keyword_Usize:
+		advance(parser)
+		return types.USIZE
+	case .Keyword_F32:
+		advance(parser)
+		return types.F32
+	case .Keyword_F64:
+		advance(parser)
+		return types.F64
+	case .Keyword_C_Char:
+		advance(parser)
+		return types.C_CHAR
+	case .Keyword_C_Schar:
+		advance(parser)
+		return types.C_SCHAR
+	case .Keyword_C_Uchar:
+		advance(parser)
+		return types.C_UCHAR
+	case .Keyword_C_Short:
+		advance(parser)
+		return types.C_SHORT
+	case .Keyword_C_Ushort:
+		advance(parser)
+		return types.C_USHORT
+	case .Keyword_C_Int:
+		advance(parser)
+		return types.C_INT
+	case .Keyword_C_Uint:
+		advance(parser)
+		return types.C_UINT
+	case .Keyword_C_Long:
+		advance(parser)
+		return types.C_LONG
+	case .Keyword_C_Ulong:
+		advance(parser)
+		return types.C_ULONG
+	case .Keyword_C_Longlong:
+		advance(parser)
+		return types.C_LONGLONG
+	case .Keyword_C_Ulonglong:
+		advance(parser)
+		return types.C_ULONGLONG
+	case .Keyword_C_Float:
+		advance(parser)
+		return types.C_FLOAT
+	case .Keyword_C_Double:
+		advance(parser)
+		return types.C_DOUBLE
+	case .Keyword_C_Longdouble:
+		advance(parser)
+		return types.C_LONGDOUBLE
 	case .Keyword_Void:
 		advance(parser)
-		return .Void
+		return types.VOID
+	case .Identifier:
+		first := advance(parser)
+		name := first
+		qualifier := symbol.INVALID
+		if _, ok := allow(parser, .Dot); ok {
+			qualifier = first.symbol
+			if current(parser).kind != .Identifier {
+				source.add(parser.diagnostics, current(parser).span, "expected a type name after '.'")
+				return types.INVALID
+			}
+			name = advance(parser)
+		}
+		return types.named(
+			&parser.module.type_store,
+			u32(parser.pkg),
+			u32(name.symbol),
+			u32(qualifier),
+			u32(parser.file),
+		)
 	}
 	source.add(parser.diagnostics, tok.span, "expected a type")
-	return .Invalid
+	return types.INVALID
 }
 
 skip_parenthesized :: proc(parser: ^Parser) -> source.Span {
@@ -168,6 +360,93 @@ parse_call :: proc(parser: ^Parser, qualifier: symbol.Id, first, name: token.Tok
 	})
 }
 
+parse_array_literal :: proc(parser: ^Parser, nesting: int) -> ast.Expr_Id {
+	start := advance(parser)
+	parser.delimiter_depth += 1
+	defer parser.delimiter_depth -= 1
+	args: [dynamic]ast.Expr_Id
+	args.allocator = parser.module.allocator
+	skip_newlines(parser)
+	for current(parser).kind != .Right_Bracket && current(parser).kind != .Eof {
+		append(&args, parse_expression_bp(parser, 0, nesting+1))
+		skip_newlines(parser)
+		if _, ok := allow(parser, .Comma); ok {
+			skip_newlines(parser)
+			continue
+		}
+		break
+	}
+	end, ok := allow(parser, .Right_Bracket)
+	if !ok {
+		source.add(parser.diagnostics, current(parser).span, "expected ']' after array literal")
+		end = start
+	}
+	return add_expr(parser, ast.Expr{
+		kind=.Array,
+		span=span_from(start.span, end.span),
+		args=args[:],
+		left=ast.INVALID_EXPR,
+		right=ast.INVALID_EXPR,
+		diagnostic=source.INVALID_DIAGNOSTIC,
+	})
+}
+
+parse_struct_literal :: proc(
+	parser: ^Parser,
+	qualifier: symbol.Id,
+	first, name: token.Token,
+	nesting: int,
+) -> ast.Expr_Id {
+	left_brace := advance(parser)
+	parser.delimiter_depth += 1
+	defer parser.delimiter_depth -= 1
+	args: [dynamic]ast.Expr_Id
+	args.allocator = parser.module.allocator
+	skip_newlines(parser)
+	for current(parser).kind != .Right_Brace && current(parser).kind != .Eof {
+		field := current(parser)
+		if field.kind != .Identifier {
+			source.add(parser.diagnostics, field.span, "expected a keyed struct field initializer")
+			break
+		}
+		advance(parser)
+		if _, ok := allow(parser, .Equal); !ok {
+			source.add(parser.diagnostics, current(parser).span, "expected '=' after struct field name")
+		}
+		skip_newlines(parser)
+		value := parse_expression_bp(parser, 0, nesting+1)
+		append(&args, add_expr(parser, ast.Expr{
+			kind=.Keyed,
+			span=span_from(field.span, parser.module.exprs[value].span),
+			name=field.symbol,
+			left=value,
+			right=ast.INVALID_EXPR,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		}))
+		skip_newlines(parser)
+		if _, ok := allow(parser, .Comma); ok {
+			skip_newlines(parser)
+			continue
+		}
+		break
+	}
+	right_brace, ok := allow(parser, .Right_Brace)
+	if !ok {
+		source.add(parser.diagnostics, current(parser).span, "expected '}' after struct literal")
+		right_brace = left_brace
+	}
+	return add_expr(parser, ast.Expr{
+		kind=.Struct_Literal,
+		span=source.Span{file=name.span.file, start=first.span.start, end=right_brace.span.end},
+		qualifier=qualifier,
+		name=name.symbol,
+		args=args[:],
+		left=ast.INVALID_EXPR,
+		right=ast.INVALID_EXPR,
+		diagnostic=source.INVALID_DIAGNOSTIC,
+	})
+}
+
 parse_integer_magnitude :: proc(text: string) -> (u64, bool) {
 	value: u64
 	for byte in transmute([]byte)text {
@@ -203,6 +482,58 @@ parse_primary :: proc(parser: ^Parser, nesting: int) -> ast.Expr_Id {
 			right=ast.INVALID_EXPR,
 			diagnostic=source.INVALID_DIAGNOSTIC,
 		})
+	case .Character:
+		advance(parser)
+		value, ok := decode_character(parser, tok)
+		if !ok {
+			return invalid_expr(parser, tok.span, "character literal must contain one Unicode code point")
+		}
+		return add_expr(parser, ast.Expr{
+			kind=.Integer,
+			span=tok.span,
+			integer=value,
+			left=ast.INVALID_EXPR,
+			right=ast.INVALID_EXPR,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+	case .Float:
+		advance(parser)
+		value, ok := strconv.parse_f64(token_text(parser, tok))
+		if !ok {
+			return invalid_expr(parser, tok.span, "invalid floating-point literal")
+		}
+		return add_expr(parser, ast.Expr{
+			kind=.Float,
+			span=tok.span,
+			integer=transmute(u64)value,
+			left=ast.INVALID_EXPR,
+			right=ast.INVALID_EXPR,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+	case .String:
+		advance(parser)
+		value := decode_import_path(parser, tok)
+		id := u64(len(parser.module.strings))
+		append(&parser.module.strings, value)
+		return add_expr(parser, ast.Expr{
+			kind=.String,
+			span=tok.span,
+			integer=id,
+			left=ast.INVALID_EXPR,
+			right=ast.INVALID_EXPR,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+	case .Keyword_None:
+		advance(parser)
+		return add_expr(parser, ast.Expr{
+			kind=.None,
+			span=tok.span,
+			left=ast.INVALID_EXPR,
+			right=ast.INVALID_EXPR,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+	case .Left_Bracket:
+		return parse_array_literal(parser, nesting)
 	case .Identifier:
 		first := advance(parser)
 		name := first
@@ -217,6 +548,9 @@ parse_primary :: proc(parser: ^Parser, nesting: int) -> ast.Expr_Id {
 		if current(parser).kind == .Left_Paren {
 			return parse_call(parser, qualifier, first, name, nesting)
 		}
+		if current(parser).kind == .Left_Brace {
+			return parse_struct_literal(parser, qualifier, first, name, nesting)
+		}
 		return add_expr(parser, ast.Expr{
 			kind=.Name,
 			span=span_from(first.span, name.span),
@@ -262,6 +596,8 @@ parse_primary :: proc(parser: ^Parser, nesting: int) -> ast.Expr_Id {
 
 infix_binding_power :: proc(kind: token.Kind) -> (left, right: int, ok: bool) {
 	#partial switch kind {
+	case .Keyword_Orelse:
+		return 2, 3, true
 	case .Plus:
 		return 10, 11, true
 	}
@@ -270,7 +606,7 @@ infix_binding_power :: proc(kind: token.Kind) -> (left, right: int, ok: bool) {
 
 prefix_binding_power :: proc(kind: token.Kind) -> (right: int, ok: bool) {
 	#partial switch kind {
-	case .Minus:
+	case .Minus, .Ampersand:
 		return 20, true
 	}
 	return 0, false
@@ -293,7 +629,7 @@ parse_expression_bp :: proc(parser: ^Parser, minimum_binding_power, nesting: int
 		operand := parse_expression_bp(parser, right_power, nesting+1)
 		operand_expr := parser.module.exprs[operand]
 		left = add_expr(parser, ast.Expr{
-			kind=.Negate,
+			kind=.Address if operator.kind == .Ampersand else .Negate,
 			span=span_from(operator.span, operand_expr.span),
 			left=operand,
 			right=ast.INVALID_EXPR,
@@ -306,17 +642,99 @@ parse_expression_bp :: proc(parser: ^Parser, minimum_binding_power, nesting: int
 		skip_newlines(parser)
 	}
 	for {
+		if current(parser).kind == .Caret || current(parser).kind == .Question {
+			operator := advance(parser)
+			left_expr := parser.module.exprs[left]
+			left = add_expr(parser, ast.Expr{
+				kind=.Deref if operator.kind == .Caret else .Unwrap,
+				span=span_from(left_expr.span, operator.span),
+				left=left,
+				right=ast.INVALID_EXPR,
+				diagnostic=source.INVALID_DIAGNOSTIC,
+			})
+			continue
+		}
+		if current(parser).kind == .Dot {
+			advance(parser)
+			field := current(parser)
+			if field.kind != .Identifier {
+				left = invalid_expr(parser, field.span, "expected a field name after '.'")
+				continue
+			}
+			advance(parser)
+			left_expr := parser.module.exprs[left]
+			left = add_expr(parser, ast.Expr{
+				kind=.Field,
+				span=span_from(left_expr.span, field.span),
+				name=field.symbol,
+				left=left,
+				right=ast.INVALID_EXPR,
+				diagnostic=source.INVALID_DIAGNOSTIC,
+			})
+			continue
+		}
+		if current(parser).kind == .Left_Bracket {
+			start_token := advance(parser)
+			parser.delimiter_depth += 1
+			skip_newlines(parser)
+			start_expr := ast.INVALID_EXPR
+			end_expr := ast.INVALID_EXPR
+			slicing := false
+			if _, ok := allow(parser, .Range); ok {
+				slicing = true
+			} else {
+				start_expr = parse_expression_bp(parser, 0, nesting+1)
+				skip_newlines(parser)
+				if _, ok := allow(parser, .Range); ok {
+					slicing = true
+				}
+			}
+			skip_newlines(parser)
+			if slicing && current(parser).kind != .Right_Bracket {
+				end_expr = parse_expression_bp(parser, 0, nesting+1)
+				skip_newlines(parser)
+			}
+			end_token, ok := allow(parser, .Right_Bracket)
+			if !ok {
+				source.add(parser.diagnostics, current(parser).span, "expected ']' after index or slice")
+				end_token = start_token
+			}
+			parser.delimiter_depth -= 1
+			left_expr := parser.module.exprs[left]
+			if slicing {
+				args := make([]ast.Expr_Id, 2, parser.module.allocator)
+				args[0] = start_expr
+				args[1] = end_expr
+				left = add_expr(parser, ast.Expr{
+					kind=.Slice,
+					span=span_from(left_expr.span, end_token.span),
+					args=args,
+					left=left,
+					right=ast.INVALID_EXPR,
+					diagnostic=source.INVALID_DIAGNOSTIC,
+				})
+			} else {
+				left = add_expr(parser, ast.Expr{
+					kind=.Index,
+					span=span_from(left_expr.span, end_token.span),
+					left=left,
+					right=start_expr,
+					diagnostic=source.INVALID_DIAGNOSTIC,
+				})
+			}
+			continue
+		}
 		left_power, right_power, ok := infix_binding_power(current(parser).kind)
 		if !ok || left_power < minimum_binding_power {
 			break
 		}
-		advance(parser)
+		operator := advance(parser)
 		skip_newlines(parser)
 		right := parse_expression_bp(parser, right_power, nesting+1)
 		left_expr := parser.module.exprs[left]
 		right_expr := parser.module.exprs[right]
 		left = add_expr(parser, ast.Expr{
-			kind=.Add,
+			kind=.Orelse if operator.kind == .Keyword_Orelse else .Add,
 			span=span_from(left_expr.span, right_expr.span),
 			left=left,
 			right=right,
@@ -381,6 +799,31 @@ parse_return :: proc(parser: ^Parser) -> ast.Stmt_Id {
 	return id
 }
 
+starts_declared_type :: proc(parser: ^Parser) -> bool {
+	if current(parser).kind != .Left_Bracket {
+		return is_type_token(current(parser).kind)
+	}
+	depth := 0
+	cursor := parser.cursor
+	for cursor < len(parser.tokens.items) {
+		kind := parser.tokens.items[cursor].kind
+		if kind == .Left_Bracket {
+			depth += 1
+		} else if kind == .Right_Bracket {
+			depth -= 1
+			if depth == 0 {
+				cursor += 1
+				break
+			}
+		}
+		cursor += 1
+	}
+	if cursor < len(parser.tokens.items) && parser.tokens.items[cursor].kind == .Keyword_Mut {
+		cursor += 1
+	}
+	return cursor < len(parser.tokens.items) && is_type_token(parser.tokens.items[cursor].kind)
+}
+
 parse_statement :: proc(parser: ^Parser) -> ast.Stmt_Id {
 	if current(parser).kind == .Keyword_Return {
 		return parse_return(parser)
@@ -389,9 +832,9 @@ parse_statement :: proc(parser: ^Parser) -> ast.Stmt_Id {
 	if current(parser).kind == .Identifier || current(parser).kind == .Underscore {
 		start_cursor := parser.cursor
 		name := advance(parser)
-		type_syntax := ast.Type_Syntax.Invalid
+		type_syntax := types.INVALID
 		had_type := false
-		if is_type_token(current(parser).kind) {
+		if starts_declared_type(parser) {
 			type_syntax = parse_type(parser)
 			had_type = true
 		}
@@ -413,6 +856,7 @@ parse_statement :: proc(parser: ^Parser) -> ast.Stmt_Id {
 				name=name.symbol,
 				type=type_syntax,
 				immutable=immutable,
+				target=ast.INVALID_EXPR,
 				expr=expr,
 				diagnostic=source.INVALID_DIAGNOSTIC,
 			})
@@ -422,6 +866,19 @@ parse_statement :: proc(parser: ^Parser) -> ast.Stmt_Id {
 	}
 
 	expr := parse_expression(parser)
+	if _, ok := allow(parser, .Equal); ok {
+		skip_newlines(parser)
+		value := parse_expression(parser)
+		id := ast.stmt_id(len(parser.module.statements))
+		append(&parser.module.statements, ast.Stmt{
+			kind=.Assignment,
+			span=span_from(parser.module.exprs[expr].span, parser.module.exprs[value].span),
+			target=expr,
+			expr=value,
+			diagnostic=source.INVALID_DIAGNOSTIC,
+		})
+		return id
+	}
 	id := ast.stmt_id(len(parser.module.statements))
 	append(&parser.module.statements, ast.Stmt{
 		kind=.Expression,
@@ -541,6 +998,57 @@ parse_function :: proc(parser: ^Parser, name: token.Token, c_abi: bool) {
 	})
 }
 
+parse_struct :: proc(parser: ^Parser, name: token.Token, c_layout: bool) {
+	start := advance(parser)
+	id := types.named(&parser.module.type_store, u32(parser.pkg), u32(name.symbol))
+	ended_by_newline := current(parser).kind == .Newline
+	skip_newlines(parser)
+	if current(parser).kind != .Left_Brace {
+		if !c_layout {
+			source.add(parser.diagnostics, start.span, "native struct declarations require a body")
+		}
+		if !types.define_struct(&parser.module.type_store, id, nil, c_layout, true) {
+			source.addf(parser.diagnostics, name.span, "duplicate type declaration '%s'", token_text(parser, name))
+		}
+		if !ended_by_newline {
+			_ = finish_statement(parser)
+		}
+		return
+	}
+	advance(parser)
+	fields: [dynamic]types.Field
+	fields.allocator = parser.module.allocator
+	defer delete(fields)
+	skip_newlines(parser)
+	for current(parser).kind != .Right_Brace && current(parser).kind != .Eof {
+		if current(parser).kind != .Identifier {
+			source.add(parser.diagnostics, current(parser).span, "expected a struct field name")
+			for current(parser).kind != .Newline &&
+			    current(parser).kind != .Right_Brace &&
+			    current(parser).kind != .Eof {
+				advance(parser)
+			}
+			skip_newlines(parser)
+			continue
+		}
+		field_name := advance(parser)
+		field_type := parse_type(parser)
+		append(&fields, types.Field{name=u32(field_name.symbol), type=field_type})
+		if _, ok := allow(parser, .Comma); ok {
+			skip_newlines(parser)
+			continue
+		}
+		_ = finish_statement(parser, true)
+	}
+	if _, ok := allow(parser, .Right_Brace); !ok {
+		source.add(parser.diagnostics, current(parser).span, "expected '}' after struct fields")
+	}
+	if !types.define_struct(&parser.module.type_store, id, fields[:], c_layout, false) {
+		source.addf(parser.diagnostics, name.span, "duplicate type declaration '%s'", token_text(parser, name))
+	}
+	_ = finish_statement(parser)
+}
+
 decode_import_path :: proc(parser: ^Parser, tok: token.Token) -> string {
 	text := token_text(parser, tok)
 	if len(text) < 2 {
@@ -553,6 +1061,13 @@ decode_import_path :: proc(parser: ^Parser, tok: token.Token) -> string {
 		if value == '\\' && index+1 < len(text)-1 {
 			index += 1
 			value = text[index]
+			switch value {
+			case 'n': value = '\n'
+			case 'r': value = '\r'
+			case 't': value = '\t'
+			case '0': value = 0
+			case:
+			}
 		}
 		strings.write_byte(&builder, value)
 	}
@@ -621,7 +1136,7 @@ parse_top_level :: proc(parser: ^Parser) {
 		}
 		parser.cursor = saved
 	}
-	type_syntax := ast.Type_Syntax.Invalid
+	type_syntax := types.INVALID
 	if is_type_token(current(parser).kind) {
 		type_syntax = parse_type(parser)
 	}
@@ -634,23 +1149,17 @@ parse_top_level :: proc(parser: ^Parser) {
 	advance(parser)
 	skip_newlines(parser)
 
-	c_abi := false
 	if operator.kind == .Colon_Colon &&
-	   current(parser).kind == .Identifier &&
+	   (current(parser).kind == .Keyword_Func || current(parser).kind == .Keyword_C_Func) {
-	   token_text(parser, current(parser)) == "c" {
+		c_abi := current(parser).kind == .Keyword_C_Func
-		saved := parser.cursor
-		c_abi = true
-		advance(parser)
-		skip_newlines(parser)
-		if current(parser).kind != .Keyword_Func {
-			c_abi = false
-			parser.cursor = saved
-		}
-	}
-	if operator.kind == .Colon_Colon && current(parser).kind == .Keyword_Func {
 		parse_function(parser, name, c_abi)
 		return
 	}
+	if operator.kind == .Colon_Colon &&
+	   (current(parser).kind == .Keyword_Struct || current(parser).kind == .Keyword_C_Struct) {
+		parse_struct(parser, name, current(parser).kind == .Keyword_C_Struct)
+		return
+	}
 
 	expr := parse_expression(parser)
 	_ = ast.global_id(len(parser.module.globals))

compiler/target/target.odin

@@ -0,0 +1,126 @@
+package target
+
+Kind :: enum u8 {
+	Aarch64_Macos,
+}
+
+Target :: struct {
+	kind: Kind,
+}
+
+C_Primitive :: enum u8 {
+	Char,
+	Schar,
+	Uchar,
+	Short,
+	Ushort,
+	Int,
+	Uint,
+	Long,
+	Ulong,
+	Longlong,
+	Ulonglong,
+	Float,
+	Double,
+	Longdouble,
+}
+
+Scalar_Kind :: enum u8 {
+	Signed_Integer,
+	Unsigned_Integer,
+	Float,
+}
+
+Scalar_Layout :: struct {
+	bits:      int,
+	alignment: int,
+	kind:      Scalar_Kind,
+}
+
+Integer_Extension :: enum u8 {
+	None,
+	Sign,
+	Zero,
+}
+
+DEFAULT :: Target{kind=.Aarch64_Macos}
+
+parse :: proc(value: string) -> (Target, bool) {
+	switch value {
+	case "aarch64-macos", "arm64-macos":
+		return DEFAULT, true
+	case:
+		return {}, false
+	}
+}
+
+name :: proc(value: Target) -> string {
+	switch value.kind {
+	case .Aarch64_Macos:
+		return "aarch64-macos"
+	}
+	return "<unsupported>"
+}
+
+pointer_bits :: proc(value: Target) -> int {
+	switch value.kind {
+	case .Aarch64_Macos:
+		return 64
+	}
+	return 0
+}
+
+llvm_triple :: proc(value: Target) -> string {
+	switch value.kind {
+	case .Aarch64_Macos:
+		return "arm64-apple-macosx13.0.0"
+	}
+	return ""
+}
+
+llvm_data_layout :: proc(value: Target) -> string {
+	switch value.kind {
+	case .Aarch64_Macos:
+		return "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-n32:64-S128-Fn32"
+	}
+	return ""
+}
+
+c_primitive_layout :: proc(value: Target, primitive: C_Primitive) -> Scalar_Layout {
+	switch value.kind {
+	case .Aarch64_Macos:
+		switch primitive {
+		case .Char, .Schar:
+			return Scalar_Layout{bits=8, alignment=1, kind=.Signed_Integer}
+		case .Uchar:
+			return Scalar_Layout{bits=8, alignment=1, kind=.Unsigned_Integer}
+		case .Short:
+			return Scalar_Layout{bits=16, alignment=2, kind=.Signed_Integer}
+		case .Ushort:
+			return Scalar_Layout{bits=16, alignment=2, kind=.Unsigned_Integer}
+		case .Int:
+			return Scalar_Layout{bits=32, alignment=4, kind=.Signed_Integer}
+		case .Uint:
+			return Scalar_Layout{bits=32, alignment=4, kind=.Unsigned_Integer}
+		case .Long, .Longlong:
+			return Scalar_Layout{bits=64, alignment=8, kind=.Signed_Integer}
+		case .Ulong, .Ulonglong:
+			return Scalar_Layout{bits=64, alignment=8, kind=.Unsigned_Integer}
+		case .Float:
+			return Scalar_Layout{bits=32, alignment=4, kind=.Float}
+		case .Double, .Longdouble:
+			return Scalar_Layout{bits=64, alignment=8, kind=.Float}
+		}
+	}
+	return {}
+}
+
+c_integer_extension :: proc(value: Target, bits: int, signed: bool) -> Integer_Extension {
+	switch value.kind {
+	case .Aarch64_Macos:
+		if bits < 32 {
+			return .Sign if signed else .Zero
+		}
+	}
+	return .None
+}

compiler/token/token.odin

@@ -9,27 +9,66 @@ Kind :: enum u8 {
 	Newline,
 	Identifier,
 	Integer,
+	Float,
 	String,
+	Character,
 	Underscore,
 	Colon_Colon,
 	Equal,
 	Plus,
 	Minus,
 	Dot,
+	Range,
+	At,
+	Star,
+	Ampersand,
+	Caret,
+	Question,
+	Semicolon,
+	Left_Bracket,
+	Right_Bracket,
 	Left_Paren,
 	Right_Paren,
 	Left_Brace,
 	Right_Brace,
 	Comma,
 	Keyword_Func,
+	Keyword_C_Func,
+	Keyword_Struct,
+	Keyword_C_Struct,
 	Keyword_Import,
 	Keyword_Return,
+	Keyword_Mut,
+	Keyword_None,
+	Keyword_Orelse,
 	Keyword_Void,
 	Keyword_Int,
 	Keyword_I8,
 	Keyword_I16,
 	Keyword_I32,
 	Keyword_I64,
+	Keyword_U8,
+	Keyword_U16,
+	Keyword_U32,
+	Keyword_U64,
+	Keyword_Isize,
+	Keyword_Usize,
+	Keyword_F32,
+	Keyword_F64,
+	Keyword_C_Char,
+	Keyword_C_Schar,
+	Keyword_C_Uchar,
+	Keyword_C_Short,
+	Keyword_C_Ushort,
+	Keyword_C_Int,
+	Keyword_C_Uint,
+	Keyword_C_Long,
+	Keyword_C_Ulong,
+	Keyword_C_Longlong,
+	Keyword_C_Ulonglong,
+	Keyword_C_Float,
+	Keyword_C_Double,
+	Keyword_C_Longdouble,
 }
 
 Token :: struct {

compiler/types/types.odin

@@ -1,94 +1,619 @@
 package types
 
+import "../target"
 import "core:fmt"
+import "core:mem"
 
-Numeric_Category :: enum {
+// Type is a compact ID. Builtin scalar types occupy the stable low range;
+// recursive and nominal types are interned in Store starting at DYNAMIC_START.
+Type :: distinct u32
+
+INVALID :: Type(0)
+VOID :: Type(1)
+INT :: Type(2)
+
+I8 :: Type(3)
+I16 :: Type(4)
+I32 :: Type(5)
+I64 :: Type(6)
+U8 :: Type(7)
+U16 :: Type(8)
+U32 :: Type(9)
+U64 :: Type(10)
+ISIZE :: Type(11)
+USIZE :: Type(12)
+F32 :: Type(13)
+F64 :: Type(14)
+
+C_CHAR :: Type(15)
+C_SCHAR :: Type(16)
+C_UCHAR :: Type(17)
+C_SHORT :: Type(18)
+C_USHORT :: Type(19)
+C_INT :: Type(20)
+C_UINT :: Type(21)
+C_LONG :: Type(22)
+C_ULONG :: Type(23)
+C_LONGLONG :: Type(24)
+C_ULONGLONG :: Type(25)
+C_FLOAT :: Type(26)
+C_DOUBLE :: Type(27)
+C_LONGDOUBLE :: Type(28)
+
+DYNAMIC_START :: Type(64)
+
+Numeric_Category :: enum u8 {
 	None,
 	Signed_Integer,
 	Unsigned_Integer,
 	Float,
 }
 
-Kind :: enum {
+Kind :: enum u8 {
 	Invalid,
 	Void,
 	Int_Constraint,
-	Concrete,
+	Scalar,
+	Array,
+	Pointer,
+	Slice,
+	Optional,
+	Named,
+	Struct,
 }
 
-Type :: struct {
+Node :: struct {
-	kind:     Kind,
+	kind:         Kind,
-	category: Numeric_Category,
+	child:        Type,
-	bits:     int,
+	count:        u64,
+	sentinel:     u64,
+	field_start:  u32,
+	field_count:  u32,
+	pkg:          u32,
+	name:         u32,
+	qualifier:    u32,
+	file:         u32,
+	mutable:      bool,
+	many:         bool,
+	has_sentinel: bool,
+	inferred_count: bool,
+	c_layout:     bool,
+	opaque:       bool,
+	declared:     bool,
 }
 
-INVALID :: Type {
+Field :: struct {
-	kind = .Invalid,
+	name: u32,
+	type: Type,
 }
-VOID :: Type {
+
-	kind = .Void,
+Store :: struct {
+	nodes:     [dynamic]Node,
+	fields:    [dynamic]Field,
+	selected:  target.Target,
+	allocator: mem.Allocator,
 }
-INT :: Type {
+
-	kind     = .Int_Constraint,
+init_store :: proc(allocator := context.allocator) -> Store {
-	category = .Signed_Integer,
+	store: Store
+	store.nodes.allocator = allocator
+	store.fields.allocator = allocator
+	store.selected = target.DEFAULT
+	store.allocator = allocator
+	return store
 }
-I8 :: Type {
+
-	kind     = .Concrete,
+destroy_store :: proc(store: ^Store) {
-	category = .Signed_Integer,
+	delete(store.nodes)
-	bits     = 8,
+	delete(store.fields)
 }
-I16 :: Type {
+
-	kind     = .Concrete,
+clone_store :: proc(source: ^Store, allocator := context.allocator) -> Store {
-	category = .Signed_Integer,
+	store := init_store(allocator)
-	bits     = 16,
+	append(&store.nodes, ..source.nodes[:])
+	append(&store.fields, ..source.fields[:])
+	store.selected = source.selected
+	return store
 }
-I32 :: Type {
+
-	kind     = .Concrete,
+intern :: proc(store: ^Store, candidate: Node) -> Type {
-	category = .Signed_Integer,
+	if candidate.kind != .Struct && candidate.kind != .Named {
-	bits     = 32,
+		for existing, index in store.nodes {
+			if existing == candidate {
+				return DYNAMIC_START+Type(index)
+			}
+		}
+	}
+	id := DYNAMIC_START+Type(len(store.nodes))
+	append(&store.nodes, candidate)
+	return id
 }
-I64 :: Type {
+
-	kind     = .Concrete,
+named :: proc(store: ^Store, pkg, name: u32, qualifier: u32 = 0, file: u32 = 0xffff_ffff) -> Type {
-	category = .Signed_Integer,
+	normalized_file := file if qualifier != 0 else u32(0)
-	bits     = 64,
+	for existing, index in store.nodes {
+		if (existing.kind == .Named || existing.kind == .Struct) &&
+		   existing.pkg == pkg && existing.name == name && existing.qualifier == qualifier &&
+		   existing.file == normalized_file {
+			return DYNAMIC_START+Type(index)
+		}
+	}
+	return intern(store, Node{kind=.Named, pkg=pkg, name=name, qualifier=qualifier, file=normalized_file})
+}
+
+find_named :: proc(store: ^Store, pkg, name: u32, qualifier: u32 = 0) -> Type {
+	for existing, index in store.nodes {
+		if (existing.kind == .Named || existing.kind == .Struct) &&
+		   existing.pkg == pkg && existing.name == name && existing.qualifier == qualifier {
+			return DYNAMIC_START+Type(index)
+		}
+	}
+	return INVALID
+}
+
+define_struct :: proc(store: ^Store, id: Type, fields: []Field, c_layout, opaque: bool) -> bool {
+	existing, ok := node(store, id)
+	if !ok || (existing.kind != .Named && existing.kind != .Struct) || existing.declared {
+		return false
+	}
+	index := int(id-DYNAMIC_START)
+	store.nodes[index].kind = .Struct
+	store.nodes[index].c_layout = c_layout
+	store.nodes[index].opaque = opaque
+	store.nodes[index].declared = true
+	store.nodes[index].field_start = u32(len(store.fields))
+	store.nodes[index].field_count = u32(len(fields))
+	append(&store.fields, ..fields)
+	return true
+}
+
+fields_for :: proc(store: ^Store, value: Type) -> []Field {
+	item, ok := node(store, value)
+	if !ok || item.kind != .Struct {
+		return nil
+	}
+	start := int(item.field_start)
+	end := start+int(item.field_count)
+	if start < 0 || end > len(store.fields) {
+		return nil
+	}
+	return store.fields[start:end]
+}
+
+kind :: proc(value: Type, store: ^Store = nil) -> Kind {
+	switch value {
+	case INVALID:
+		return .Invalid
+	case VOID:
+		return .Void
+	case INT:
+		return .Int_Constraint
+	}
+	if value >= I8 && value <= C_LONGDOUBLE {
+		return .Scalar
+	}
+	if store != nil && value >= DYNAMIC_START {
+		index := int(value-DYNAMIC_START)
+		if index >= 0 && index < len(store.nodes) {
+			return store.nodes[index].kind
+		}
+	}
+	return .Invalid
+}
+
+node :: proc(store: ^Store, value: Type) -> (Node, bool) {
+	if store == nil || value < DYNAMIC_START {
+		return {}, false
+	}
+	index := int(value-DYNAMIC_START)
+	if index < 0 || index >= len(store.nodes) {
+		return {}, false
+	}
+	return store.nodes[index], true
 }
 
 is_valid :: proc(value: Type) -> bool {
-	return value.kind != .Invalid
+	return value != INVALID
+}
+
+is_void :: proc(value: Type) -> bool {
+	return value == VOID
+}
+
+is_constraint :: proc(value: Type) -> bool {
+	return value == INT
+}
+
+is_c :: proc(value: Type) -> bool {
+	return value >= C_CHAR && value <= C_LONGDOUBLE
+}
+
+as_c_primitive :: proc(value: Type) -> (target.C_Primitive, bool) {
+	switch value {
+	case C_CHAR:       return .Char, true
+	case C_SCHAR:      return .Schar, true
+	case C_UCHAR:      return .Uchar, true
+	case C_SHORT:      return .Short, true
+	case C_USHORT:     return .Ushort, true
+	case C_INT:        return .Int, true
+	case C_UINT:       return .Uint, true
+	case C_LONG:       return .Long, true
+	case C_ULONG:      return .Ulong, true
+	case C_LONGLONG:   return .Longlong, true
+	case C_ULONGLONG:  return .Ulonglong, true
+	case C_FLOAT:      return .Float, true
+	case C_DOUBLE:     return .Double, true
+	case C_LONGDOUBLE: return .Longdouble, true
+	}
+	return {}, false
+}
+
+category :: proc(value: Type, selected := target.DEFAULT) -> Numeric_Category {
+	switch value {
+	case I8, I16, I32, I64, ISIZE:
+		return .Signed_Integer
+	case U8, U16, U32, U64, USIZE:
+		return .Unsigned_Integer
+	case F32, F64:
+		return .Float
+	case:
+		primitive, ok := as_c_primitive(value)
+		if !ok {
+			return .None
+		}
+		switch target.c_primitive_layout(selected, primitive).kind {
+		case .Signed_Integer:   return .Signed_Integer
+		case .Unsigned_Integer: return .Unsigned_Integer
+		case .Float:            return .Float
+		}
+	}
+	return .None
+}
+
+bits :: proc(value: Type, selected := target.DEFAULT) -> int {
+	switch value {
+	case I8, U8:
+		return 8
+	case I16, U16:
+		return 16
+	case I32, U32, F32:
+		return 32
+	case I64, U64, F64:
+		return 64
+	case ISIZE, USIZE:
+		return target.pointer_bits(selected)
+	case:
+		primitive, ok := as_c_primitive(value)
+		return target.c_primitive_layout(selected, primitive).bits if ok else 0
+	}
+}
+
+alignment :: proc(value: Type, selected := target.DEFAULT) -> int {
+	if primitive, ok := as_c_primitive(value); ok {
+		return target.c_primitive_layout(selected, primitive).alignment
+	}
+	width := bits(value, selected)/8
+	return min(max(width, 1), 8)
+}
+
+representation :: proc(value: Type, selected := target.DEFAULT) -> Type {
+	if value == ISIZE {
+		return I64
+	}
+	if value == USIZE {
+		return U64
+	}
+	primitive, ok := as_c_primitive(value)
+	if !ok {
+		return value
+	}
+	layout := target.c_primitive_layout(selected, primitive)
+	if layout.kind == .Float {
+		return F32 if layout.bits == 32 else F64
+	}
+	if layout.kind == .Signed_Integer {
+		switch layout.bits {
+		case 8:  return I8
+		case 16: return I16
+		case 32: return I32
+		case:    return I64
+		}
+	}
+	switch layout.bits {
+	case 8:  return U8
+	case 16: return U16
+	case 32: return U32
+	case:    return U64
+	}
+}
+
+is_concrete_scalar :: proc(value: Type) -> bool {
+	return kind(value) == .Scalar
+}
+
+is_concrete :: proc(value: Type, store: ^Store = nil) -> bool {
+	value_kind := kind(value, store)
+	if value_kind == .Scalar || value_kind == .Array || value_kind == .Pointer ||
+	   value_kind == .Slice || value_kind == .Optional {
+		return true
+	}
+	if value_kind == .Struct {
+		item, ok := node(store, value)
+		return ok && item.declared
+	}
+	return false
+}
+
+is_pointer :: proc(value: Type, store: ^Store) -> bool {
+	return kind(value, store) == .Pointer
+}
+
+is_array :: proc(value: Type, store: ^Store) -> bool {
+	return kind(value, store) == .Array
+}
+
+is_slice :: proc(value: Type, store: ^Store) -> bool {
+	return kind(value, store) == .Slice
+}
+
+is_optional :: proc(value: Type, store: ^Store) -> bool {
+	return kind(value, store) == .Optional
+}
+
+is_struct :: proc(value: Type, store: ^Store) -> bool {
+	return kind(value, store) == .Struct
+}
+
+is_optional_pointer :: proc(value: Type, store: ^Store) -> bool {
+	item, ok := node(store, value)
+	return ok && item.kind == .Optional && is_pointer(item.child, store)
+}
+
+is_runtime_value :: proc(value: Type, store: ^Store) -> bool {
+	value_kind := kind(value, store)
+	if value_kind == .Scalar || value_kind == .Pointer {
+		return true
+	}
+	if value_kind == .Slice || value_kind == .Array || value_kind == .Optional {
+		return !contains_c_struct_by_value(value, store)
+	}
+	if value_kind == .Struct {
+		item, ok := node(store, value)
+		return ok && item.declared && !item.opaque && !contains_c_struct_by_value(value, store)
+	}
+	return false
+}
+
+contains_c_struct_by_value :: proc(value: Type, store: ^Store, depth := 0) -> bool {
+	if depth > 256 {
+		return true
+	}
+	item, ok := node(store, value)
+	if !ok {
+		return false
+	}
+	if item.kind == .Pointer {
+		return false
+	}
+	if item.kind == .Struct {
+		if item.c_layout {
+			return true
+		}
+		for field in fields_for(store, value) {
+			if contains_c_struct_by_value(field.type, store, depth+1) {
+				return true
+			}
+		}
+		return false
+	}
+	if item.kind == .Array || item.kind == .Slice || item.kind == .Optional {
+		return contains_c_struct_by_value(item.child, store, depth+1)
+	}
+	return false
+}
+
+is_c_signature_type :: proc(value: Type, store: ^Store, allow_void := false) -> bool {
+	if allow_void && is_void(value) {
+		return true
+	}
+	return is_concrete_scalar(value) || is_pointer(value, store) || is_optional_pointer(value, store)
+}
+
+child_type :: proc(value: Type, store: ^Store) -> Type {
+	item, ok := node(store, value)
+	return item.child if ok else INVALID
+}
+
+logical_count :: proc(value: Type, store: ^Store) -> u64 {
+	item, ok := node(store, value)
+	return item.count if ok else 0
+}
+
+physical_count :: proc(value: Type, store: ^Store) -> u64 {
+	item, ok := node(store, value)
+	if !ok {
+		return 0
+	}
+	return item.count + (u64(1) if item.has_sentinel else u64(0))
+}
+
+is_mutable :: proc(value: Type, store: ^Store) -> bool {
+	item, ok := node(store, value)
+	return ok && item.mutable
+}
+
+is_many_pointer :: proc(value: Type, store: ^Store) -> bool {
+	item, ok := node(store, value)
+	return ok && item.kind == .Pointer && item.many
+}
+
+is_c_struct :: proc(value: Type, store: ^Store) -> bool {
+	item, ok := node(store, value)
+	return ok && item.kind == .Struct && item.c_layout
+}
+
+pointer :: proc(store: ^Store, child: Type, mutable, many: bool) -> Type {
+	return intern(store, Node{kind=.Pointer, child=child, mutable=mutable, many=many})
+}
+
+slice :: proc(store: ^Store, child: Type, mutable: bool, has_sentinel := false, sentinel: u64 = 0) -> Type {
+	return intern(store, Node{
+		kind=.Slice,
+		child=child,
+		mutable=mutable,
+		has_sentinel=has_sentinel,
+		sentinel=sentinel,
+	})
+}
+
+array :: proc(
+	store: ^Store,
+	child: Type,
+	count: u64,
+	mutable: bool,
+	has_sentinel := false,
+	sentinel: u64 = 0,
+) -> Type {
+	return intern(store, Node{
+		kind=.Array,
+		child=child,
+		count=count,
+		mutable=mutable,
+		has_sentinel=has_sentinel,
+		sentinel=sentinel,
+	})
+}
+
+optional :: proc(store: ^Store, child: Type) -> Type {
+	return intern(store, Node{kind=.Optional, child=child})
+}
+
+with_array_count :: proc(store: ^Store, value: Type, count: u64) -> Type {
+	item, ok := node(store, value)
+	if !ok || item.kind != .Array {
+		return value
+	}
+	item.count = count
+	item.inferred_count = false
+	return intern(store, item)
+}
+
+can_weaken_pointer :: proc(from, to: Type, store: ^Store) -> bool {
+	from_node, from_ok := node(store, from)
+	to_node, to_ok := node(store, to)
+	return from_ok && to_ok &&
+	       from_node.kind == .Pointer && to_node.kind == .Pointer &&
+	       from_node.child == to_node.child && from_node.many == to_node.many &&
+	       from_node.mutable && !to_node.mutable
+}
+
+is_opaque_struct :: proc(value: Type, store: ^Store) -> bool {
+	item, ok := node(store, value)
+	return ok && item.kind == .Struct && item.opaque
+}
+
+size :: proc(value: Type, store: ^Store, selected := target.DEFAULT) -> u64 {
+	#partial switch kind(value, store) {
+	case .Scalar:
+		return u64(bits(value, selected)/8)
+	case .Pointer:
+		return u64(target.pointer_bits(selected)/8)
+	case .Slice:
+		return u64(target.pointer_bits(selected)/8*2)
+	case .Array:
+		item, _ := node(store, value)
+		return physical_count(value, store)*size(item.child, store, selected)
+	case .Optional:
+		item, _ := node(store, value)
+		if is_pointer(item.child, store) {
+			return u64(target.pointer_bits(selected)/8)
+		}
+		child_size := size(item.child, store, selected)
+		child_align := u64(alignment_of(item.child, store, selected))
+		return ((child_size+1+child_align-1)/child_align)*child_align
+	case .Struct:
+		offset: u64
+		max_align: u64 = 1
+		for field in fields_for(store, value) {
+			field_align := u64(alignment_of(field.type, store, selected))
+			offset = (offset+field_align-1)/field_align*field_align
+			offset += size(field.type, store, selected)
+			max_align = max(max_align, field_align)
+		}
+		return (offset+max_align-1)/max_align*max_align
+	case:
+		return 0
+	}
+}
+
+alignment_of :: proc(value: Type, store: ^Store, selected := target.DEFAULT) -> int {
+	#partial switch kind(value, store) {
+	case .Scalar:
+		return alignment(value, selected)
+	case .Pointer, .Slice:
+		return target.pointer_bits(selected)/8
+	case .Array, .Optional:
+		return alignment_of(child_type(value, store), store, selected)
+	case .Struct:
+		result := 1
+		for field in fields_for(store, value) {
+			result = max(result, alignment_of(field.type, store, selected))
+		}
+		return result
+	case:
+		return 1
+	}
 }
 
 is_concrete_integer :: proc(value: Type) -> bool {
-	return(
+	category := category(value)
-		value.kind == .Concrete &&
+	return kind(value) == .Scalar &&
-		(value.category == .Signed_Integer || value.category == .Unsigned_Integer) \
+	       (category == .Signed_Integer || category == .Unsigned_Integer)
-	)
 }
 
-is_signed :: proc(value: Type) -> bool {
+is_float :: proc(value: Type, selected := target.DEFAULT) -> bool {
-	return value.kind == .Concrete && value.category == .Signed_Integer
+	return kind(value) == .Scalar && category(value, selected) == .Float
+}
+
+is_signed :: proc(value: Type, selected := target.DEFAULT) -> bool {
+	return kind(value) == .Scalar && category(value, selected) == .Signed_Integer
+}
+
+is_unsigned :: proc(value: Type, selected := target.DEFAULT) -> bool {
+	return kind(value) == .Scalar && category(value, selected) == .Unsigned_Integer
 }
 
 equal :: proc(a, b: Type) -> bool {
-	return a.kind == b.kind && a.category == b.category && a.bits == b.bits
+	return a == b
+}
+
+same_numeric_family :: proc(a, b: Type) -> bool {
+	if category(a) != category(b) {
+		return false
+	}
+	// C primitives are intentionally distinct semantic types. Exact-width
+	// Brolang scalars may widen only to other Brolang scalars.
+	return !is_c(a) && !is_c(b)
 }
 
 can_widen :: proc(from, to: Type) -> bool {
 	if equal(from, to) {
 		return true
 	}
-	return(
+	return is_concrete_scalar(from) &&
-		from.kind == .Concrete &&
+	       is_concrete_scalar(to) &&
-		to.kind == .Concrete &&
+	       same_numeric_family(from, to) &&
-		from.category == to.category &&
+	       bits(from) < bits(to)
-		from.bits < to.bits \
-	)
 }
 
 widest :: proc(a, b: Type) -> Type {
-	if a.kind != .Concrete || b.kind != .Concrete || a.category != b.category {
+	if equal(a, b) && is_concrete_scalar(a) {
+		return a
+	}
+	if !is_concrete_scalar(a) || !is_concrete_scalar(b) || !same_numeric_family(a, b) {
 		return INVALID
 	}
-	if a.bits >= b.bits {
+	if bits(a) >= bits(b) {
 		return a
 	}
 	return b
@@ -108,32 +633,37 @@ smallest_signed_for_literal :: proc(value: i64) -> Type {
 }
 
 name :: proc(value: Type) -> string {
-	switch value.kind {
+	switch value {
-	case .Invalid:
+	case INVALID:       return "<invalid>"
-		return "<invalid>"
+	case VOID:          return "void"
-	case .Void:
+	case INT:           return "int"
-		return "void"
+	case I8:            return "i8"
-	case .Int_Constraint:
+	case I16:           return "i16"
-		return "int"
+	case I32:           return "i32"
-	case .Concrete:
+	case I64:           return "i64"
-		switch value.category {
+	case U8:            return "u8"
-		case .Signed_Integer:
+	case U16:           return "u16"
-			switch value.bits {
+	case U32:           return "u32"
-			case 8:
+	case U64:           return "u64"
-				return "i8"
+	case ISIZE:         return "isize"
-			case 16:
+	case USIZE:         return "usize"
-				return "i16"
+	case F32:           return "f32"
-			case 32:
+	case F64:           return "f64"
-				return "i32"
+	case C_CHAR:        return "c_char"
-			case 64:
+	case C_SCHAR:       return "c_schar"
-				return "i64"
+	case C_UCHAR:       return "c_uchar"
-			}
+	case C_SHORT:       return "c_short"
-		case .Unsigned_Integer:
+	case C_USHORT:      return "c_ushort"
-			return fmt.tprintf("u%d", value.bits)
+	case C_INT:         return "c_int"
-		case .Float:
+	case C_UINT:        return "c_uint"
-			return fmt.tprintf("f%d", value.bits)
+	case C_LONG:        return "c_long"
-		case .None:
+	case C_ULONG:       return "c_ulong"
-		}
+	case C_LONGLONG:    return "c_longlong"
+	case C_ULONGLONG:   return "c_ulonglong"
+	case C_FLOAT:       return "c_float"
+	case C_DOUBLE:      return "c_double"
+	case C_LONGDOUBLE:  return "c_longdouble"
+	case:
+		return fmt.tprintf("<type %d>", value)
 	}
-	return "<invalid>"
 }

compiler_tests.odin

@@ -14,6 +14,7 @@ import "./compiler/lower"
 import "./compiler/parser"
 import "./compiler/source"
 import "./compiler/symbol"
+import "./compiler/target"
 import "./compiler/token"
 import "./compiler/types"
 import "core:fmt"
@@ -86,9 +87,10 @@ main :: func() void { _ = value }
 compact_ids_reserve_invalid_values_and_preserve_layout :: proc(t: ^testing.T) {
 	testing.expect_value(t, size_of(source.Span), 12)
 	testing.expect_value(t, size_of(token.Token), 24)
-	testing.expect_value(t, size_of(ast.Expr), 64)
+	testing.expect(t, size_of(ast.Expr) <= 64)
-	testing.expect_value(t, size_of(hir.Expr), 88)
+	testing.expect(t, size_of(hir.Expr) <= 88)
-	testing.expect_value(t, size_of(ir.Instruction), 88)
+	testing.expect(t, size_of(ir.Instruction) <= 88)
+	testing.expect_value(t, size_of(types.Type), 4)
 
 	source_index, source_ok := source.source_index(source.Source_Id(0), 1)
 	testing.expect_value(t, source_index, 0)
@@ -195,8 +197,8 @@ main :: func() void { _ = give() }
 
 @(test)
 parser_distinguishes_bodyless_declarations_and_definitions :: proc(t: ^testing.T) {
-	text := `foreign :: c func(value i32) i32
+	text := `foreign :: c_func(value i32) i32
-defined :: c func(value i32) i32
+defined :: c_func(value i32) i32
 {
 	return value
 }
@@ -229,7 +231,7 @@ main :: func() void {}
 parser_treats_c_as_contextual_only_before_func :: proc(t: ^testing.T) {
 	text := `c :: 5
 x :: c
-foreign :: c func() i32
+foreign :: c_func() i32
 broken :: c 5
 main :: func() void {}
 `
@@ -403,6 +405,8 @@ cli_parses_ordered_link_options_and_rejects_invalid_forms :: proc(t: ^testing.T)
 		"thing",
 		"--link",
 		"helper.o",
+		"--target",
+		"aarch64-macos",
 	})
 	defer delete(options.link_arguments)
 
@@ -415,15 +419,18 @@ cli_parses_ordered_link_options_and_rejects_invalid_forms :: proc(t: ^testing.T)
 	testing.expect_value(t, options.link_arguments[1].kind, linker.Kind.Library_Path)
 	testing.expect_value(t, options.link_arguments[2].kind, linker.Kind.Library)
 	testing.expect_value(t, options.link_arguments[3].value, "helper.o")
+	testing.expect_value(t, target.name(options.target), "aarch64-macos")
 
 	_, unknown_valid := parse_cli_args([]string{"brolang", "app", "-o", "out", "--unknown", "value"})
 	_, incomplete_valid := parse_cli_args([]string{"brolang", "app", "-o"})
 	_, duplicate_output_valid := parse_cli_args([]string{"brolang", "app", "-o", "one", "-o", "two"})
 	_, duplicate_empty_output_valid := parse_cli_args([]string{"brolang", "app", "-o", "", "-o", "two"})
+	_, invalid_target := parse_cli_args([]string{"brolang", "app", "-o", "out", "--target", "x86_64-linux"})
 	testing.expect(t, !unknown_valid)
 	testing.expect(t, !incomplete_valid)
 	testing.expect(t, !duplicate_output_valid)
 	testing.expect(t, !duplicate_empty_output_valid)
+	testing.expect(t, !invalid_target)
 }
 
 @(test)
@@ -453,7 +460,7 @@ main :: func() void {}
 }
 
 @(test)
-parser_rejects_chained_package_access :: proc(t: ^testing.T) {
+parser_accepts_chained_field_access :: proc(t: ^testing.T) {
 	text := `main :: func() void {
 	_ = first.second.value
 }
@@ -468,7 +475,7 @@ parser_rejects_chained_package_access :: proc(t: ^testing.T) {
 	module := parser.parse(&stream, &source_file, &diagnostics)
 	defer ast.destroy_module(&module)
 
-	testing.expect(t, len(diagnostics.items) > 0)
+	testing.expect_value(t, len(diagnostics.items), 0)
 }
 
 @(test)
@@ -566,7 +573,7 @@ main :: func() void {
 
 @(test)
 pipeline_emits_specialized_calling_conventions_and_checked_add :: proc(t: ^testing.T) {
-	text := `sum_c :: c func(a, b int) int {
+	text := `sum_c :: c_func(a, b int) int {
 	return a + b
 }
 sum_bro :: func(a, b int) int {
@@ -597,16 +604,16 @@ main :: func() void {
 
 	testing.expect_value(t, len(diagnostics.items), 0)
 	testing.expect_value(t, llvm_text, second_llvm_text)
-	testing.expect(t, strings.contains(llvm_text, "define i8 @bro_c__p0__sum_c__i8__i8"))
+	testing.expect(t, strings.contains(llvm_text, "define signext i8 @bro_c__p0__sum_c__i8__i8"))
 	testing.expect(t, strings.contains(llvm_text, "define internal fastcc i8 @bro__p0__sum_bro__i8__i8"))
 	testing.expect(t, strings.contains(llvm_text, "@llvm.sadd.with.overflow.i8"))
 }
 
 @(test)
 pipeline_emits_only_referenced_foreign_declarations_with_exact_names :: proc(t: ^testing.T) {
-	text := `used :: c func(a, b i32) i32
+	text := `used :: c_func(a, b i32) i32
-unused :: c func() i32
+unused :: c_func() i32
-bodyful :: c func(value i32) i32 {
+bodyful :: c_func(value i32) i32 {
 	return value
 }
 main :: func() void {
@@ -637,9 +644,126 @@ main :: func() void {
 	testing.expect(t, strings.contains(llvm_text, "define i32 @bro_c__p0__bodyful__i32"))
 }
 
+@(test)
+c_primitives_remain_distinct_with_apple_silicon_representations :: proc(t: ^testing.T) {
+	testing.expect(t, types.C_CHAR != types.C_SCHAR)
+	testing.expect(t, types.C_SCHAR != types.C_UCHAR)
+	testing.expect(t, types.C_INT != types.I32)
+	testing.expect(t, types.C_ULONG != types.U64)
+	testing.expect_value(t, types.representation(types.C_CHAR), types.I8)
+	testing.expect_value(t, types.representation(types.C_SCHAR), types.I8)
+	testing.expect_value(t, types.representation(types.C_UCHAR), types.U8)
+	testing.expect_value(t, types.representation(types.C_SHORT), types.I16)
+	testing.expect_value(t, types.representation(types.C_USHORT), types.U16)
+	testing.expect_value(t, types.representation(types.C_INT), types.I32)
+	testing.expect_value(t, types.representation(types.C_UINT), types.U32)
+	testing.expect_value(t, types.representation(types.C_LONG), types.I64)
+	testing.expect_value(t, types.representation(types.C_ULONG), types.U64)
+	testing.expect_value(t, types.representation(types.C_LONGLONG), types.I64)
+	testing.expect_value(t, types.representation(types.C_ULONGLONG), types.U64)
+	testing.expect_value(t, types.representation(types.C_FLOAT), types.F32)
+	testing.expect_value(t, types.representation(types.C_DOUBLE), types.F64)
+	testing.expect_value(t, types.representation(types.C_LONGDOUBLE), types.F64)
+	testing.expect_value(t, target.llvm_triple(target.DEFAULT), "arm64-apple-macosx13.0.0")
+}
+
+@(test)
+interop_foundation_emits_compounds_and_narrow_c_abi_attributes :: proc(t: ^testing.T) {
+	text := `Point :: struct {
+	x i32
+	y i32
+}
+signed :: c_func(value c_char) c_char
+unsigned :: c_func(value c_uchar) c_uchar
+exact :: c_func(value u32) u32
+fallback :: func() i32 {
+	return 9
+}
+main :: func() void {
+	c :: 1
+	values [2;0]mut u8 = [1, 2]
+	point Point :: Point{x = 3, y = 4}
+	maybe ?i32 = 5
+	_ = c
+	_ = values[2]
+	_ = values.ptr + 1
+	_ = values.len
+	_ = values[0..2]
+	_ = "hello".ptr
+	_ = "hello".len
+	_ = point.x
+	_ = maybe?
+	_ = maybe orelse 0
+	_ = maybe orelse fallback()
+	_ = signed(1)
+	_ = unsigned(1)
+	_ = exact(1)
+}
+`
+	source_file := source.Source{path="test.bro", text=text}
+	diagnostics := source.init_diagnostics(&source_file)
+	defer source.destroy_diagnostics(&diagnostics)
+	symbols := symbol.init_table()
+	defer symbol.destroy_table(&symbols)
+	stream := lexer.lex(&source_file, &diagnostics, &symbols)
+	defer delete(stream.items)
+	ast_module := parser.parse(&stream, &source_file, &diagnostics)
+	defer ast.destroy_module(&ast_module)
+	hir_module := checker.check(&ast_module, &diagnostics, &symbols)
+	defer hir.destroy_module(&hir_module)
+	ir_module := lower.lower(&hir_module)
+	defer ir.destroy_module(&ir_module)
+	llvm_text := llvm.emit(&ir_module, &diagnostics, &symbols)
+	defer delete(llvm_text)
+
+	testing.expect_value(t, len(diagnostics.items), 0)
+	testing.expect(t, strings.contains(llvm_text, "target triple = \"arm64-apple-macosx13.0.0\""))
+	testing.expect(t, strings.contains(llvm_text, "declare signext i8 @signed(i8 signext)"))
+	testing.expect(t, strings.contains(llvm_text, "declare zeroext i8 @unsigned(i8 zeroext)"))
+	testing.expect(t, strings.contains(llvm_text, "declare i32 @exact(i32)"))
+	testing.expect(t, strings.contains(llvm_text, "@bro.str.0 = private unnamed_addr constant [6 x i8] c\"hello\\00\""))
+	testing.expect(t, strings.contains(llvm_text, "getelementptr [3 x i8]"))
+	testing.expect(t, strings.contains(llvm_text, "attempted to unwrap none"))
+	testing.expect(t, strings.contains(llvm_text, "orelse_fallback"))
+	testing.expect(t, strings.contains(llvm_text, "orelse_some"))
+}
+
+@(test)
+c_structs_are_pointer_only_and_may_be_opaque :: proc(t: ^testing.T) {
+	text := `Defined :: c_struct {
+	value c_int
+}
+Opaque :: c_struct
+read :: c_func(value @Defined) c_int
+bad_param :: c_func(value Defined) void
+bad_result :: c_func() Defined
+main :: func() void {}
+`
+	source_file := source.Source{path="test.bro", text=text}
+	diagnostics := source.init_diagnostics(&source_file)
+	defer source.destroy_diagnostics(&diagnostics)
+	symbols := symbol.init_table()
+	defer symbol.destroy_table(&symbols)
+	stream := lexer.lex(&source_file, &diagnostics, &symbols)
+	defer delete(stream.items)
+	ast_module := parser.parse(&stream, &source_file, &diagnostics)
+	defer ast.destroy_module(&ast_module)
+	hir_module := checker.check(&ast_module, &diagnostics, &symbols)
+	defer hir.destroy_module(&hir_module)
+
+	found_param := false
+	found_result := false
+	for diagnostic in diagnostics.items {
+		found_param = found_param || strings.contains(diagnostic.message, "cannot be passed by value")
+		found_result = found_result || strings.contains(diagnostic.message, "cannot be returned by value")
+	}
+	testing.expect(t, found_param)
+	testing.expect(t, found_result)
+}
+
 @(test)
 invalid_foreign_declarations_are_eagerly_diagnosed_and_calls_trap :: proc(t: ^testing.T) {
-	text := `bad :: c func(value int) int
+	text := `bad :: c_func(value int) int
 native :: func() i32
 main :: func() void {
 	_ = bad(1)
@@ -667,7 +791,7 @@ main :: func() void {
 	for diagnostic in diagnostics.items {
 		found_parameter = found_parameter || strings.contains(diagnostic.message, "requires concrete parameter types")
 		found_result = found_result || strings.contains(diagnostic.message, "requires a concrete or void result type")
-		found_native = found_native || strings.contains(diagnostic.message, "must use 'c func'")
+		found_native = found_native || strings.contains(diagnostic.message, "must use 'c_func'")
 	}
 	testing.expect(t, found_parameter)
 	testing.expect(t, found_result)
@@ -707,7 +831,7 @@ duplicate_foreign_symbols_across_packages_are_poisoned :: proc(t: ^testing.T) {
 
 @(test)
 bodyless_root_main_recovers_as_a_trap_definition :: proc(t: ^testing.T) {
-	text := "main :: c func() i32\n"
+	text := "main :: c_func() i32\n"
 	source_file := source.Source{path="test.bro", text=text}
 	diagnostics := source.init_diagnostics(&source_file)
 	defer source.destroy_diagnostics(&diagnostics)
@@ -974,7 +1098,7 @@ eager_global_calls_root_specializations :: proc(t: ^testing.T) {
 unused_native :: func() i32 {
 	return 9
 }
-unused_foreign :: c func() i32
+unused_foreign :: c_func() i32
 value i32 :: make()
 main :: func() void {}
 `
@@ -1040,16 +1164,16 @@ long_generic_call_chain_reaches_a_fixed_point :: proc(t: ^testing.T) {
 	builder := strings.builder_make()
 	defer strings.builder_destroy(&builder)
 	for index in 0 ..< 70 {
-		fmt.sbprintf(&builder, "f%d :: func(value int) int ", index)
+		fmt.sbprintf(&builder, "fn%d :: func(value int) int ", index)
 		strings.write_string(&builder, "{ return ")
 		if index == 69 {
 			strings.write_string(&builder, "value")
 		} else {
-			fmt.sbprintf(&builder, "f%d(value)", index+1)
+			fmt.sbprintf(&builder, "fn%d(value)", index+1)
 		}
 		strings.write_string(&builder, " }\n")
 	}
-	strings.write_string(&builder, "main :: func() i32 { return f0(1) }\n")
+	strings.write_string(&builder, "main :: func() i32 { return fn0(1) }\n")
 
 	source_file := source.Source{path="test.bro", text=strings.to_string(builder)}
 	diagnostics := source.init_diagnostics(&source_file)
@@ -1195,6 +1319,17 @@ foreign_function_links_from_c_source :: proc(t: ^testing.T) {
 	testing.expect_value(t, state.exit_code, 42)
 }
 
+@(test)
+interop_foundation_matches_zig_compiled_apple_silicon_c_fixture :: proc(t: ^testing.T) {
+	output := "/tmp/brolang-test-interop-foundation"
+	defer _ = os.remove(output)
+	arguments := []linker.Argument{{kind=.Input, value="examples/interop/foundation/native.c"}}
+	status := compiler_core.compile_package("examples/interop/foundation", output, arguments)
+	testing.expect_value(t, status, 0)
+	state := run_executable(output)
+	testing.expect_value(t, state.exit_code, 1)
+}
+
 @(test)
 foreign_function_links_from_object :: proc(t: ^testing.T) {
 	output := "/tmp/brolang-test-foreign-object"
@@ -1442,6 +1577,8 @@ backend_translates_link_arguments_without_reordering_them :: proc(t: ^testing.T)
 		"/usr/bin/env",
 		"zig",
 		"cc",
+		"-target",
+		"aarch64-macos",
 		"-Wno-override-module",
 		"module.ll",
 		"native.c",
@@ -2127,8 +2264,8 @@ package_llvm_is_deterministic_and_symbols_include_package_ids :: proc(t: ^testin
 	testing.expect(t, loaded)
 	testing.expect_value(t, len(diagnostics.items), 0)
 	testing.expect_value(t, llvm_text, second_llvm_text)
-	testing.expect(t, strings.contains(llvm_text, "define i8 @bro_c__p1__same"))
+	testing.expect(t, strings.contains(llvm_text, "define signext i8 @bro_c__p1__same"))
-	testing.expect(t, strings.contains(llvm_text, "define i8 @bro_c__p2__same"))
+	testing.expect(t, strings.contains(llvm_text, "define signext i8 @bro_c__p2__same"))
 	testing.expect(t, strings.contains(llvm_text, "define i32 @main()"))
 }
 

examples/interop/foundation/main.bro

@@ -0,0 +1,29 @@
+Buffer :: c_struct {
+	data *c_char
+	length c_ulong
+}
+
+get_buffer :: c_func() @Buffer
+verify :: c_func(
+	char_value c_char,
+	schar_value c_schar,
+	uchar_value c_uchar,
+	short_value c_short,
+	ushort_value c_ushort,
+	int_value c_int,
+	uint_value c_uint,
+	long_value c_long,
+	ulong_value c_ulong,
+	longlong_value c_longlong,
+	ulonglong_value c_ulonglong,
+	float_value c_float,
+	double_value c_double,
+	longdouble_value c_longdouble,
+) i32
+
+main :: func() i32 {
+	buffer @Buffer :: get_buffer()
+	_ = buffer^.data
+	_ = buffer^.length
+	return verify(1, -2, 3, -4, 5, -6, 7, -8, 9, -10, 11, 12.0, 13.0, 14.0)
+}

examples/interop/foundation/native.c

@@ -0,0 +1,42 @@
+struct Buffer {
+    const char *data;
+    unsigned long length;
+};
+
+static const struct Buffer buffer = {"ok", 2};
+
+const struct Buffer *get_buffer(void) {
+    return &buffer;
+}
+
+int verify(
+    char char_value,
+    signed char schar_value,
+    unsigned char uchar_value,
+    short short_value,
+    unsigned short ushort_value,
+    int int_value,
+    unsigned int uint_value,
+    long long_value,
+    unsigned long ulong_value,
+    long long longlong_value,
+    unsigned long long ulonglong_value,
+    float float_value,
+    double double_value,
+    long double longdouble_value
+) {
+    return char_value == 1 &&
+           schar_value == -2 &&
+           uchar_value == 3 &&
+           short_value == -4 &&
+           ushort_value == 5 &&
+           int_value == -6 &&
+           uint_value == 7 &&
+           long_value == -8 &&
+           ulong_value == 9 &&
+           longlong_value == -10 &&
+           ulonglong_value == 11 &&
+           float_value == 12.0f &&
+           double_value == 13.0 &&
+           longdouble_value == 14.0L;
+}

examples/interop/manual/main.bro

@@ -1,4 +1,4 @@
-foreign_add :: c func(a, b i32) i32
+foreign_add :: c_func(a, b i32) i32
 
 main :: func() i32 {
 	return foreign_add(20, 22)

examples/packages/c_symbols/left/left.bro

@@ -1,3 +1,3 @@
-same :: c func() int {
+same :: c_func() int {
 	return 1
 }

examples/packages/c_symbols/right/right.bro

@@ -1,3 +1,3 @@
-same :: c func() int {
+same :: c_func() int {
 	return 2
 }

examples/packages/foreign_duplicate/left/left.bro

@@ -1 +1 @@
-same :: c func() i32
+same :: c_func() i32

examples/packages/foreign_duplicate/right/right.bro

@@ -1 +1 @@
-same :: c func() i32
+same :: c_func() i32

examples/programs/prototype/main.bro

@@ -2,7 +2,7 @@
 
 x int :: 2
 
-sum_c :: c func(a, b int) int {
+sum_c :: c_func(a, b int) int {
 	return a + b
 }
 

main.odin

@@ -2,6 +2,7 @@ package main
 
 import "./compiler"
 import "./compiler/linker"
+import "./compiler/target"
 import "core:fmt"
 import "core:os/os2"
 
@@ -9,13 +10,14 @@ Cli_Options :: struct {
 	input_path:     string,
 	output_path:    string,
 	link_arguments: []linker.Argument,
+	target:         target.Target,
 }
 
 parse_cli_args :: proc(args: []string, allocator := context.allocator) -> (Cli_Options, bool) {
 	if len(args) < 4 {
 		return {}, false
 	}
-	options := Cli_Options{input_path=args[1]}
+	options := Cli_Options{input_path=args[1], target=target.DEFAULT}
 	link_arguments: [dynamic]linker.Argument
 	link_arguments.allocator = allocator
 	output_set := false
@@ -43,6 +45,13 @@ parse_cli_args :: proc(args: []string, allocator := context.allocator) -> (Cli_O
 			append(&link_arguments, linker.Argument{kind=.Library_Path, value=value})
 		case "--library":
 			append(&link_arguments, linker.Argument{kind=.Library, value=value})
+		case "--target":
+			selected, ok := target.parse(value)
+			if !ok {
+				delete(link_arguments)
+				return {}, false
+			}
+			options.target = selected
 		case:
 			delete(link_arguments)
 			return {}, false
@@ -58,7 +67,7 @@ parse_cli_args :: proc(args: []string, allocator := context.allocator) -> (Cli_O
 
 print_usage :: proc() {
 	fmt.eprintln(
-		"usage: brolang <package-directory> -o <executable> [--link <path> | --library-path <dir> | --library <name>]...",
+		"usage: brolang <package-directory> -o <executable> [--target aarch64-macos] [--link <path> | --library-path <dir> | --library <name>]...",
 	)
 }
 
@@ -69,7 +78,7 @@ main :: proc() {
 		os2.exit(2)
 	}
 	defer delete(options.link_arguments)
-	status := compiler.compile_package(options.input_path, options.output_path, options.link_arguments)
+	status := compiler.compile_package(options.input_path, options.output_path, options.link_arguments, options.target)
 	if status != 0 {
 		os2.exit(status)
 	}