469 lines
18 KiB
Plaintext
469 lines
18 KiB
Plaintext
import "@std/mem"
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import "@std/arraylist"
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import "@ffi/c"
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import "@source/ast"
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import "@source/diagnostics"
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import "@source/ir"
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sema :: import "@source/sema"
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typecheck :: import "@source/sema/check"
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@hide:file
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StorageKind :: enum { none, function, global, local }
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@hide:file
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Storage :: struct {
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kind StorageKind = .none
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index u32 = 0
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}
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@hide:file
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State :: struct {
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tree @ast.Tree
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resolution @sema.Resolution
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checked @typecheck.Result
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diagnostics @mut diagnostics.Store
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module @mut ir.Module
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storage []mut Storage
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function usize = 0
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terminated bool = false
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}
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#! lowers checked source into caller-owned executable storage; release with ir.deinit.
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#! no frontend storage or source bytes are retained by the returned module.
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lower proc(
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allocator mem.Allocator,
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tree @ast.Tree,
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resolution @sema.Resolution,
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checked @typecheck.Result,
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diagnostic_store @mut diagnostics.Store,
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) ir.Module ! (mem.AllocError | diagnostics.CapacityError) {
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module := ir.init(allocator)
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errdefer ir.deinit(&module)
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storage :: try mem.alloc(Storage, allocator, ast.node_count(tree))
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defer mem.free(allocator, storage)
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mem.set(storage, Storage{})
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state := State{
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tree = tree,
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resolution = resolution,
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checked = checked,
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diagnostics = diagnostic_store,
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module = &module,
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storage = storage,
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}
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# allocate every package identity before lowering any initializer or body.
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for (0..ast.package_decl_count(tree)) |i| {
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id :: ast.package_decl(tree, i)
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match ast.decl_kind(tree, id) {
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.function: {
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function :: try add_function(&module, ast.node_span(tree, id))
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storage[usize(id)] = Storage{ kind = .function, index = u32(function) }
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}
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.statement: {
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initializer :: try add_function(&module, ast.node_span(tree, id))
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global :: u32(module.globals.items.len)
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try arraylist.append(&module.globals, ir.Global{
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type = lower_type(typecheck.type_of(checked, id)),
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initializer = initializer,
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span = ast.node_span(tree, id),
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})
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storage[usize(id)] = Storage{ kind = .global, index = global }
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}
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.invalid: {}
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}
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}
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try find_entry(&state)
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for (0..ast.package_decl_count(tree)) |i| {
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id :: ast.package_decl(tree, i)
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match ast.decl_kind(tree, id) {
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.function: try lower_function(&state, id)
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.statement: try lower_global(&state, id)
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.invalid: {}
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}
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}
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return module
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}
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@hide:file
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lower_type proc(type typecheck.Type) ir.Type {
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return match type.kind {
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.int: .int
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.float: .float
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.string: .string
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.void: .void
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.function: .function
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.none, .invalid: .invalid
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}
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}
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@hide:file
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add_function proc(module @mut ir.Module, span diagnostics.Span) ir.FunctionId ! mem.AllocError {
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id :: ir.FunctionId(module.functions.items.len)
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try arraylist.append(&module.functions, ir.init_function(module.allocator))
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function := &module.functions.items[usize(id)]
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function.span = span
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try arraylist.append(&function.blocks, ir.init_block(module.allocator))
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return id
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}
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@hide:file
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find_entry proc(state @mut State) void ! (mem.AllocError | diagnostics.CapacityError) {
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tree :: state.tree
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for (0..ast.package_decl_count(tree)) |i| {
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id :: ast.package_decl(tree, i)
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name := diagnostics.Span{ start = 0, end = 0 }
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match ast.decl_kind(tree, id) {
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.function: name = ast.function_decl(tree, id).name
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.statement: name = ast.statement_decl(tree, id).name
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.invalid: continue
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}
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if (!mem.eql(ast.source_text(tree, name), "main")) continue
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if (ast.decl_kind(tree, id) != .function) {
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state.module.entry_diagnostic = try diagnostics.add(state.diagnostics, .invalid_entry, name)
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return
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}
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declaration :: ast.function_decl(tree, id)
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result :: lower_type(typecheck.type_of(state.checked, declaration.return_type))
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if (ast.function_param_count(tree, id) != 0 or result == .function) {
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state.module.entry_diagnostic = try diagnostics.add(state.diagnostics, .invalid_entry, name)
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return
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}
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state.module.entry = ir.FunctionId(state.storage[usize(id)].index)
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return
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}
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state.module.entry_diagnostic = try diagnostics.add(state.diagnostics, .missing_entry, ast.node_span(tree, tree.root))
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}
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@hide:file
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trap proc(state @mut State, diagnostic diagnostics.DiagnosticId, span diagnostics.Span) void {
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state.module.functions.items[state.function].blocks.items[0].terminator = ir.Terminator{
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kind = .trap,
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diagnostic = diagnostic,
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span = span,
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}
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state.terminated = true
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}
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@hide:file
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trap_type proc(state @mut State, id ast.NodeId) bool {
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type :: typecheck.type_of(state.checked, id)
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if (type.kind != .invalid) return false
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trap(state, type.diagnostic, ast.node_span(state.tree, id))
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return true
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}
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@hide:file
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trap_binding proc(state @mut State, id ast.NodeId) bool {
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binding :: sema.binding(state.resolution, id)
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if (binding.kind != .invalid) return false
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trap(state, binding.data.diagnostic, ast.node_span(state.tree, id))
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return true
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}
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@hide:file
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finish proc(state @mut State, value ir.ValueId, span diagnostics.Span) void {
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state.module.functions.items[state.function].blocks.items[0].terminator = ir.Terminator{
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value = value,
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span = span,
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}
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state.terminated = true
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}
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@hide:file
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emit proc(state @mut State, instruction ir.Instruction) ir.ValueId ! mem.AllocError {
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function := &state.module.functions.items[state.function]
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operation := instruction
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if (operation.op != .store_local) {
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operation.destination = ir.ValueId(function.value_count)
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function.value_count += 1
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}
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try arraylist.append(&function.blocks.items[0].instructions, operation)
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return operation.destination
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}
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@hide:file
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constant proc(state @mut State, value ir.Value, span diagnostics.Span) ir.ValueId ! mem.AllocError {
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return try emit(state, ir.Instruction{ op = .constant, type = value.type, constant = value, span = span })
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}
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@hide:file
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lower_global proc(state @mut State, id ast.NodeId) void ! (mem.AllocError | diagnostics.CapacityError) {
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global :: state.module.globals.items[usize(state.storage[usize(id)].index)]
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state.function = usize(global.initializer)
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state.terminated = false
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state.module.functions.items[state.function].result = global.type
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if (trap_binding(state, id)) return
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declaration :: ast.statement_decl(state.tree, id)
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if (declaration.type) |annotation| if (trap_type(state, annotation)) return
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value :: try lower_expression(state, declaration.initializer)
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if (state.terminated or trap_type(state, id)) return
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finish(state, value, declaration.span)
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}
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@hide:file
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lower_function proc(state @mut State, id ast.NodeId) void ! (mem.AllocError | diagnostics.CapacityError) {
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tree :: state.tree
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declaration :: ast.function_decl(tree, id)
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state.function = usize(state.storage[usize(id)].index)
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state.terminated = false
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function := &state.module.functions.items[state.function]
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function.result = lower_type(typecheck.type_of(state.checked, declaration.return_type))
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for (0..ast.function_param_count(tree, id)) |i| {
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parameter :: ast.function_param(tree, id, i)
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type :: lower_type(typecheck.type_of(state.checked, parameter))
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state.storage[usize(parameter)] = Storage{ kind = .local, index = u32(function.locals.items.len) }
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try arraylist.append(&function.parameters, type)
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try arraylist.append(&function.locals, type)
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}
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for (0..ast.block_statement_count(tree, declaration.body)) |i| {
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statement :: ast.block_statement(tree, declaration.body, i)
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if (ast.stmt_kind(tree, statement) != .declaration) continue
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state.storage[usize(statement)] = Storage{ kind = .local, index = u32(function.locals.items.len) }
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try arraylist.append(&function.locals, lower_type(typecheck.type_of(state.checked, statement)))
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}
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# signature errors are entry traps; body errors are reached in statement order.
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if (trap_binding(state, id) or trap_type(state, declaration.return_type)) return
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for (0..ast.function_param_count(tree, id)) |i| {
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if (trap_type(state, ast.function_param(tree, id, i))) return
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}
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if (trap_type(state, id)) return
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for (0..ast.block_statement_count(tree, declaration.body)) |i| {
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if (state.terminated) return
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try lower_statement(state, ast.block_statement(tree, declaration.body, i))
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}
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if (state.terminated or trap_type(state, declaration.body)) return
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finish(state, ir.no_value, ast.node_span(tree, declaration.body))
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}
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@hide:file
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lower_statement proc(state @mut State, id ast.NodeId) void ! (mem.AllocError | diagnostics.CapacityError) {
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tree :: state.tree
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match ast.stmt_kind(tree, id) {
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.invalid: {
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invalid :: ast.invalid(tree, id)
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trap(state, invalid.diagnostic, invalid.span)
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}
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.expression: _ = try lower_expression(state, ast.statement_expr(tree, id))
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.declaration: {
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if (trap_binding(state, id)) return
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declaration :: ast.statement_decl(tree, id)
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if (declaration.type) |annotation| if (trap_type(state, annotation)) return
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value :: try lower_expression(state, declaration.initializer)
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if (state.terminated or trap_type(state, id)) return
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_ = try emit(state, ir.Instruction{
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op = .store_local,
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type = lower_type(typecheck.type_of(state.checked, id)),
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left = value,
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slot = state.storage[usize(id)].index,
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span = declaration.span,
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})
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}
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.return_stmt: {
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statement :: ast.return_stmt(tree, id)
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value := ir.no_value
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if (statement.value) |expression| value = try lower_expression(state, expression)
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if (state.terminated or trap_type(state, id)) return
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finish(state, value, statement.span)
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}
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}
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}
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@hide:file
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lower_expression proc(state @mut State, id ast.NodeId) ir.ValueId ! (mem.AllocError | diagnostics.CapacityError) {
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tree :: state.tree
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span :: ast.node_span(tree, id)
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type :: lower_type(typecheck.type_of(state.checked, id))
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match ast.expr_kind(tree, id) {
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.invalid: {
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invalid :: ast.invalid(tree, id)
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trap(state, invalid.diagnostic, invalid.span)
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}
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.literal_int, .literal_float: {
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if (trap_type(state, id)) return ir.no_value
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return try lower_number(state, id)
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}
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.literal_string: {
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if (trap_type(state, id)) return ir.no_value
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return try lower_string(state, id)
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}
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.identifier: {
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if (trap_binding(state, id) or trap_type(state, id)) return ir.no_value
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binding :: sema.binding(state.resolution, id)
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location :: state.storage[usize(binding.data.declaration)]
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match location.kind {
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.function: return try constant(state, ir.Value{
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type = .function,
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data = ir.ValueData{ function = ir.FunctionId(location.index) },
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}, span)
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.global: return try emit(state, ir.Instruction{ op = .load_global, type = type, slot = location.index, span = span })
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.local: return try emit(state, ir.Instruction{ op = .load_local, type = type, slot = location.index, span = span })
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.none: unreachable
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}
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}
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.unary: {
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expression :: ast.unary_expr(tree, id)
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if (type == .int and ast.expr_kind(tree, expression.operand) == .literal_int) {
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text :: ast.source_text(tree, ast.node_span(tree, expression.operand))
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if (integer_magnitude(text, u64(maxval!(i64)) + 1)) |magnitude| {
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if (magnitude == u64(maxval!(i64)) + 1) {
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return try constant(state, ir.Value{ type = .int, data = ir.ValueData{ integer = minval!(i64) } }, span)
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}
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}
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}
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operand :: try lower_expression(state, expression.operand)
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if (state.terminated or trap_type(state, id)) return ir.no_value
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return try emit(state, ir.Instruction{ op = .negate, type = type, left = operand, span = span })
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}
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.binary: {
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expression :: ast.binary_expr(tree, id)
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left :: try lower_expression(state, expression.left)
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if (state.terminated) return ir.no_value
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right :: try lower_expression(state, expression.right)
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if (state.terminated or trap_type(state, id)) return ir.no_value
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op ir.Op :: match expression.operator {
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.add: .add
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.subtract: .subtract
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.multiply: .multiply
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.divide: .divide
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}
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return try emit(state, ir.Instruction{ op = op, type = type, left = left, right = right, span = span })
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}
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.call: {
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callee :: try lower_expression(state, ast.call_expr(tree, id).callee)
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if (state.terminated) return ir.no_value
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# reserve this call's packed slice before nested calls append theirs.
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block := &state.module.functions.items[state.function].blocks.items[0]
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start :: block.arguments.items.len
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count :: ast.call_arg_count(tree, id)
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for (0..count) |_| try arraylist.append(&block.arguments, ir.no_value)
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for (0..count) |i| {
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argument :: try lower_expression(state, ast.call_arg(tree, id, i))
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if (state.terminated) return ir.no_value
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block.arguments.items[start + i] = argument
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}
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if (trap_type(state, id)) return ir.no_value
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return try emit(state, ir.Instruction{
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op = .call,
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type = type,
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left = callee,
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arguments_start = start,
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arguments_count = count,
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span = span,
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})
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}
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}
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return ir.no_value
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}
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@hide:file
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integer_magnitude proc(text []u8, limit u64) ?u64 {
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value := u64(0)
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for (text) |byte| {
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if (byte < '0' or byte > '9') return null
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digit :: u64(byte - '0')
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if (value > divtrunc!(limit - digit, u64(10))) return null
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value = value * 10 + digit
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}
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return value
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}
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@hide:file
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lower_number proc(state @mut State, id ast.NodeId) ir.ValueId ! (mem.AllocError | diagnostics.CapacityError) {
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span :: ast.node_span(state.tree, id)
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text :: ast.source_text(state.tree, span)
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type :: lower_type(typecheck.type_of(state.checked, id))
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if (type == .int) {
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if (integer_magnitude(text, u64(maxval!(i64)))) |magnitude| {
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return try constant(state, ir.Value{ type = .int, data = ir.ValueData{ integer = i64(magnitude) } }, span)
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}
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} else {
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buffer :: try mem.alloc(u8, state.module.allocator, text.len + 1)
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defer mem.free(state.module.allocator, buffer)
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for (text) |byte, i| buffer[i] = byte
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buffer[text.len] = 0
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c.__error()?^ = 0
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value :: f64(c.strtod(ptrcast!(buffer.ptr), null))
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# libc reports ERANGE for representable subnormals as well as zero/infinity.
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if (c.__error()?^ != c.ERANGE or (value > 0 and value < 1)) {
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return try constant(state, ir.Value{ type = .float, data = ir.ValueData{ real = value } }, span)
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}
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}
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trap(state, try diagnostics.add(state.diagnostics, .literal_out_of_range, span), span)
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return ir.no_value
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}
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@hide:file
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hex_digit proc(byte u8) ?u8 {
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if (byte >= '0' and byte <= '9') return byte - '0'
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if (byte >= 'a' and byte <= 'f') return byte - 'a' + 10
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if (byte >= 'A' and byte <= 'F') return byte - 'A' + 10
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return null
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}
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@hide:file
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lower_string proc(state @mut State, id ast.NodeId) ir.ValueId ! (mem.AllocError | diagnostics.CapacityError) {
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span :: ast.node_span(state.tree, id)
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text :: ast.source_text(state.tree, span)
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owned :: try mem.alloc(u8, state.module.allocator, text.len - 2)
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transferred := false
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defer if (!transferred) mem.free(state.module.allocator, owned)
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length := usize(0)
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cursor := usize(1)
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end :: text.len - 1
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valid := true
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while (cursor < end) {
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byte := text[cursor]
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cursor += 1
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if (byte == '\\') {
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if (cursor >= end) {
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valid = false
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break
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}
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escape :: text[cursor]
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cursor += 1
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match escape {
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'\\': byte = '\\'
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'"': byte = '"'
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'n': byte = '\n'
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'r': byte = '\r'
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't': byte = '\t'
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'0': byte = 0
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'x': {
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if (end - cursor < 2) {
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valid = false
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break
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}
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high := u8(0)
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low := u8(0)
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if (hex_digit(text[cursor])) |digit| high = digit
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else {
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valid = false
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break
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}
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if (hex_digit(text[cursor + 1])) |digit| low = digit
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else {
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valid = false
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break
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}
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byte = high * 16 + low
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cursor += 2
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}
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else: {
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valid = false
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break
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}
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}
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}
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owned[length] = byte
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length += 1
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}
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if (!valid) {
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trap(state, try diagnostics.add(state.diagnostics, .invalid_escape, span), span)
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return ir.no_value
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|
}
|
|
# retain the complete allocation for freeing, but expose only decoded bytes.
|
|
try arraylist.append(&state.module.strings, owned)
|
|
transferred = true
|
|
return try constant(state, ir.Value{ type = .string, data = ir.ValueData{ string = owned[..length] } }, span)
|
|
}
|