booleans, comparisons, and if/else

compiler/hir/hir.odin

@@ -77,6 +77,7 @@ Expr_Kind :: enum u8 {
 	Integer,
 	Float,
 	String,
+	Bool,
 	Array,
 	Struct,
 	None,
@@ -99,8 +100,17 @@ Expr_Kind :: enum u8 {
 	Weaken_Slice,
 	Decay_Array_Pointer,
 	Negate,
+	Not,
 	Add,
 	Pointer_Add,
+	Eq,
+	Ne,
+	Lt,
+	Le,
+	Gt,
+	Ge,
+	And,
+	Or,
 	Call,
 }
 
@@ -130,6 +140,7 @@ Stmt_Kind :: enum u8 {
 	Expression,
 	Sink,
 	Trap,
+	If,
 }
 
 Stmt :: struct {
@@ -138,6 +149,10 @@ Stmt :: struct {
 	local:      Local_Id,
 	target:     Expr_Id,
 	expr:       Expr_Id,
+	// `If` statements use `expr` as the condition and `then_body`/`else_body` as
+	// the branch statement lists.
+	then_body:  []Stmt_Id,
+	else_body:  []Stmt_Id,
 	diagnostic: source.Diagnostic_Id,
 }
 
@@ -204,6 +219,10 @@ destroy_module :: proc(module: ^Module) {
 	for expr in module.exprs {
 		delete(expr.args, module.allocator)
 	}
+	for statement in module.statements {
+		delete(statement.then_body, module.allocator)
+		delete(statement.else_body, module.allocator)
+	}
 	for function in module.functions {
 		delete(function.link_name, module.allocator)
 		delete(function.params, module.allocator)