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| author | nsfisis <nsfisis@gmail.com> | 2025-09-05 01:47:01 +0900 |
|---|---|---|
| committer | nsfisis <nsfisis@gmail.com> | 2025-09-05 01:47:05 +0900 |
| commit | 68251039083d21af43da11d76980e1ea426a3a4a (patch) | |
| tree | 31183efbcb3a914d2fcacf1d3fbf28a2d071cecd /src | |
| parent | 6e4010b7c14af83b15d28bc020fe601991d209d3 (diff) | |
| download | ducc-68251039083d21af43da11d76980e1ea426a3a4a.tar.gz ducc-68251039083d21af43da11d76980e1ea426a3a4a.tar.zst ducc-68251039083d21af43da11d76980e1ea426a3a4a.zip | |
feat: make va_list definition compatible with GCC's
Diffstat (limited to 'src')
| -rw-r--r-- | src/codegen.c | 37 |
1 files changed, 21 insertions, 16 deletions
diff --git a/src/codegen.c b/src/codegen.c index a16ae73..000126b 100644 --- a/src/codegen.c +++ b/src/codegen.c @@ -307,24 +307,29 @@ static void codegen_func_call(CodeGen* g, AstNode* ast) { const char* func_name = ast->name; if (strcmp(func_name, "__ducc_va_start") == 0) { - int stack_size = g->current_func->node_stack_size; fprintf(g->out, " # __ducc_va_start BEGIN\n"); - for (int i = 0; i < 6; ++i) { - fprintf(g->out, " mov rax, %s\n", param_reg(i)); - fprintf(g->out, " mov [rbp-%d], rax\n", 8 + (stack_size - 4 - i) * 8); - } - AstNode* va_list_args = ast->node_args->node_items; - codegen_expr(g, va_list_args, GenMode_lval); + AstNode* va_list_args = &ast->node_args->node_items[0]; + codegen_expr(g, va_list_args, GenMode_rval); fprintf(g->out, " pop rdi\n"); - fprintf(g->out, " mov rax, rbp\n"); - fprintf(g->out, " sub rax, %d\n", 8 + (stack_size - 1) * 8); - fprintf(g->out, " mov [rdi], rax\n"); - fprintf(g->out, " mov DWORD PTR [rax], 8\n"); - fprintf(g->out, " mov DWORD PTR [rax+4], 0\n"); - fprintf(g->out, " mov QWORD PTR [rax+8], 0\n"); - fprintf(g->out, " mov rdi, rbp\n"); - fprintf(g->out, " sub rdi, %d\n", 8 + (stack_size - 4) * 8); - fprintf(g->out, " mov QWORD PTR [rax+16], rdi\n"); + + // Allocate save area. + fprintf(g->out, " sub rsp, 48\n"); + + fprintf(g->out, " mov [rsp+ 0], rdi\n"); + fprintf(g->out, " mov [rsp+ 8], rsi\n"); + fprintf(g->out, " mov [rsp+16], rdx\n"); + fprintf(g->out, " mov [rsp+24], rcx\n"); + fprintf(g->out, " mov [rsp+32], r8\n"); + fprintf(g->out, " mov [rsp+40], r9\n"); + + // Initialize va_list. + fprintf(g->out, " mov DWORD PTR [rdi], 8\n"); // gp_offset + fprintf(g->out, " mov DWORD PTR [rdi+4], 0\n"); // fp_offset + fprintf(g->out, " lea rax, [rbp+16]\n"); // overflow_arg_area + fprintf(g->out, " mov QWORD PTR [rdi+8], rax\n"); + fprintf(g->out, " mov QWORD PTR [rdi+16], rsp\n"); // reg_save_area + + fprintf(g->out, " push 0\n"); // dummy return value fprintf(g->out, " # __ducc_va_start END\n"); return; } |