diff options
Diffstat (limited to 'src/codegen.c')
| -rw-r--r-- | src/codegen.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/codegen.c b/src/codegen.c index 000126b..dccabe4 100644 --- a/src/codegen.c +++ b/src/codegen.c @@ -134,6 +134,46 @@ static void codegen_deref_expr(CodeGen* g, AstNode* ast, GenMode gen_mode) { } } +static void codegen_cast_expr(CodeGen* g, AstNode* ast) { + codegen_expr(g, ast->node_operand, GenMode_rval); + + int src_size = type_sizeof(ast->node_operand->ty); + int dst_size = type_sizeof(ast->ty); + + if (src_size == dst_size) + return; + + fprintf(g->out, " pop rax\n"); + + if (dst_size == 1) { + fprintf(g->out, " movsx rax, al\n"); + } else if (dst_size == 2) { + if (src_size == 1) { + fprintf(g->out, " movsx rax, al\n"); + } else { + fprintf(g->out, " movsx rax, ax\n"); + } + } else if (dst_size == 4) { + if (src_size == 1) { + fprintf(g->out, " movsx rax, al\n"); + } else if (src_size == 2) { + fprintf(g->out, " movsx rax, ax\n"); + } else { + fprintf(g->out, " movsxd rax, eax\n"); + } + } else if (dst_size == 8) { + if (src_size == 1) { + fprintf(g->out, " movsx rax, al\n"); + } else if (src_size == 2) { + fprintf(g->out, " movsx rax, ax\n"); + } else if (src_size == 4) { + fprintf(g->out, " movsxd rax, eax\n"); + } + } + + fprintf(g->out, " push rax\n"); +} + static void codegen_logical_expr(CodeGen* g, AstNode* ast) { int label = codegen_new_label(g); @@ -406,6 +446,8 @@ static void codegen_expr(CodeGen* g, AstNode* ast, GenMode gen_mode) { codegen_ref_expr(g, ast, gen_mode); } else if (ast->kind == AstNodeKind_deref_expr) { codegen_deref_expr(g, ast, gen_mode); + } else if (ast->kind == AstNodeKind_cast_expr) { + codegen_cast_expr(g, ast); } else if (ast->kind == AstNodeKind_binary_expr) { codegen_binary_expr(g, ast, gen_mode); } else if (ast->kind == AstNodeKind_cond_expr) { |