From 3654ce578e6fff53950874adf7e0e4ae0a6eb956 Mon Sep 17 00:00:00 2001
From: nsfisis <nsfisis@gmail.com>
Date: Sun, 3 May 2026 17:29:12 +0900
Subject: refactor: organize directory structure

---
 src/cc1/codegen_wasm.c | 164 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 src/cc1/codegen_wasm.c

(limited to 'src/cc1/codegen_wasm.c')

diff --git a/src/cc1/codegen_wasm.c b/src/cc1/codegen_wasm.c
new file mode 100644
index 0000000..c7f8870
--- /dev/null
+++ b/src/cc1/codegen_wasm.c
@@ -0,0 +1,164 @@
+#include <stdlib.h>
+#include <string.h>
+#include "../lib/common.h"
+#include "codegen.h"
+#include "preprocess.h"
+
+typedef enum {
+    GenMode_lval,
+    GenMode_rval,
+} GenMode;
+
+typedef struct {
+    FILE* out;
+    int next_label;
+    int* loop_labels;
+    AstNode* current_func;
+    int switch_label;
+} CodeGen;
+
+static CodeGen* codegen_new(FILE* out) {
+    CodeGen* g = calloc(1, sizeof(CodeGen));
+    g->out = out;
+    g->next_label = 1;
+    g->loop_labels = calloc(1024, sizeof(int));
+    g->switch_label = -1;
+    return g;
+}
+
+static void codegen_expr(CodeGen* g, AstNode* ast, GenMode gen_mode);
+static void codegen_stmt(CodeGen* g, AstNode* ast);
+
+static void codegen_func_prologue(CodeGen* g, FuncDefNode* func_def) {
+    for (int i = 0; i < func_def->params->as.list->len; ++i) {
+        fprintf(g->out, " (param $l_%s i32)", func_def->params->as.list->items[i].as.param->name);
+    }
+    fprintf(g->out, " (result i32)\n");
+}
+
+static void codegen_func_epilogue(CodeGen*) {
+}
+
+static void codegen_int_expr(CodeGen* g, IntExprNode* expr) {
+    fprintf(g->out, "  i32.const %d\n", expr->value);
+}
+
+static void codegen_binary_expr(CodeGen* g, BinaryExprNode* expr, GenMode gen_mode) {
+    codegen_expr(g, expr->lhs, gen_mode);
+    codegen_expr(g, expr->rhs, gen_mode);
+    if (expr->op == TokenKind_plus) {
+        fprintf(g->out, "  i32.add\n");
+    } else if (expr->op == TokenKind_minus) {
+        fprintf(g->out, "  i32.sub\n");
+    } else if (expr->op == TokenKind_le) {
+        fprintf(g->out, "  i32.le_s\n");
+    } else {
+        unreachable();
+    }
+}
+
+static void codegen_lvar(CodeGen* g, LvarNode* lvar, GenMode) {
+    fprintf(g->out, "  local.get $l_%s\n", lvar->name);
+}
+
+static void codegen_func_call(CodeGen* g, FuncCallNode* call) {
+    const char* func_name;
+    if (call->func->kind == AstNodeKind_func) {
+        func_name = call->func->as.func->name;
+    } else {
+        unimplemented();
+    }
+
+    AstNode* args = call->args;
+    for (int i = 0; i < args->as.list->len; ++i) {
+        AstNode* arg = args->as.list->items + i;
+        codegen_expr(g, arg, GenMode_rval);
+    }
+    fprintf(g->out, "  call $%s\n", func_name);
+}
+
+static void codegen_expr(CodeGen* g, AstNode* ast, GenMode gen_mode) {
+    if (ast->kind == AstNodeKind_int_expr) {
+        codegen_int_expr(g, ast->as.int_expr);
+    } else if (ast->kind == AstNodeKind_binary_expr) {
+        codegen_binary_expr(g, ast->as.binary_expr, gen_mode);
+    } else if (ast->kind == AstNodeKind_lvar) {
+        codegen_lvar(g, ast->as.lvar, gen_mode);
+    } else if (ast->kind == AstNodeKind_func_call) {
+        codegen_func_call(g, ast->as.func_call);
+    } else {
+        unreachable();
+    }
+}
+
+static void codegen_return_stmt(CodeGen* g, ReturnStmtNode* stmt) {
+    if (stmt->expr) {
+        codegen_expr(g, stmt->expr, GenMode_rval);
+    }
+    fprintf(g->out, "  return\n");
+}
+
+static void codegen_if_stmt(CodeGen* g, IfStmtNode* stmt) {
+    codegen_expr(g, stmt->cond, GenMode_rval);
+    fprintf(g->out, "  (if (result i32)\n");
+    fprintf(g->out, "    (then\n");
+    codegen_stmt(g, stmt->then);
+    fprintf(g->out, "    )\n");
+    if (stmt->else_) {
+        fprintf(g->out, "    (else\n");
+        codegen_stmt(g, stmt->else_);
+        fprintf(g->out, "    )\n");
+    } else {
+        fprintf(g->out, "    (else\n");
+        fprintf(g->out, "      i32.const 0\n");
+        fprintf(g->out, "    )\n");
+    }
+    fprintf(g->out, "  )\n");
+}
+
+static void codegen_block_stmt(CodeGen* g, AstNode* ast) {
+    for (int i = 0; i < ast->as.list->len; ++i) {
+        AstNode* stmt = ast->as.list->items + i;
+        codegen_stmt(g, stmt);
+    }
+}
+
+static void codegen_stmt(CodeGen* g, AstNode* ast) {
+    if (ast->kind == AstNodeKind_list) {
+        codegen_block_stmt(g, ast);
+    } else if (ast->kind == AstNodeKind_return_stmt) {
+        codegen_return_stmt(g, ast->as.return_stmt);
+    } else if (ast->kind == AstNodeKind_if_stmt) {
+        codegen_if_stmt(g, ast->as.if_stmt);
+    } else if (ast->kind == AstNodeKind_nop) {
+        // Do nothing.
+    } else {
+        unreachable();
+    }
+}
+
+static void codegen_func(CodeGen* g, AstNode* ast) {
+    g->current_func = ast;
+
+    fprintf(g->out, "(func $%s (export \"%s\")", ast->as.func_def->name, ast->as.func_def->name);
+
+    codegen_func_prologue(g, ast->as.func_def);
+    codegen_stmt(g, ast->as.func_def->body);
+    codegen_func_epilogue(g);
+
+    fprintf(g->out, ")\n");
+    g->current_func = NULL;
+}
+
+void codegen_wasm(Program* prog, FILE* out) {
+    CodeGen* g = codegen_new(out);
+
+    fprintf(g->out, "(module\n");
+
+    for (int i = 0; i < prog->funcs->as.list->len; ++i) {
+        AstNode* func = prog->funcs->as.list->items + i;
+        codegen_func(g, func);
+    }
+
+    fprintf(g->out, ")\n");
+}
-- 
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