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12.8 切片 4：CMP_* 与 IF/ELSIF/ELSE 跳转。

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- CMP_xx：两侧求值到临时后比较；IF 编成 <cond→t> JF t, L_next <body> JMP L_end 链
- 分支尾部 JMP 与条件 JF 双回填；无 else 时末分支 JF 直接落 L_end
- codegen_test：89 断言（用例 04 完整跳转序列），ctest 9/9
This commit is contained in:
Admin
2026-08-21 11:43:23 +08:00
parent e7dee50cde
commit 6f1bf61c7f
2 changed files with 148 additions and 13 deletions
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tests/src/codegen_test.cpp
+51
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@@ -347,6 +347,56 @@ static bool test_not() {
return true;
}
// ---- 9. 用例 04：IF / ELSIF / ELSE（CMP + JF + JMP 回填）----
static bool test_case04() {
std::vector<uint8_t> img;
std::string err;
CHECK(compile_case("04_if_elsif_else", &img, &err));
const isa::ImageView v = isa::ImageView::from(img);
CHECK(v.ok());
const isa::FuncRow r = v.func_row(0);
CHECK(r.nregs == 5); // sel out + 3 临时（CMP 目的 + 两操作数）
CHECK(r.code_len == 14);
char buf[64];
const uint8_t* base = v.code_bytes();
const uint32_t* ins = reinterpret_cast<const uint32_t*>(base);
// IF sel = 0 THEN：sel→r3、0→r4、CMP_EQ r2（常量序：0、10、1、20、30）
isa::disasm(ins[0], buf, sizeof buf);
CHECK(std::strcmp(buf, "MOVE r3, r0") == 0);
isa::disasm(ins[1], buf, sizeof buf);
CHECK(std::strcmp(buf, "LOADK r4, 0") == 0);
isa::disasm(ins[2], buf, sizeof buf);
CHECK(std::strcmp(buf, "CMP_EQ r2, r3, r4") == 0);
isa::disasm(ins[3], buf, sizeof buf);
CHECK(std::strcmp(buf, "JF r2, +2") == 0); // 假 → elsif（[6]）
isa::disasm(ins[4], buf, sizeof buf);
CHECK(std::strcmp(buf, "LOADK r1, 1") == 0); // out := 10（常量 1）
isa::disasm(ins[5], buf, sizeof buf);
CHECK(std::strcmp(buf, "JMP +7") == 0); // → end（[13]）
// ELSIF sel = 1
isa::disasm(ins[6], buf, sizeof buf);
CHECK(std::strcmp(buf, "MOVE r3, r0") == 0);
isa::disasm(ins[7], buf, sizeof buf);
CHECK(std::strcmp(buf, "LOADK r4, 2") == 0);
isa::disasm(ins[8], buf, sizeof buf);
CHECK(std::strcmp(buf, "CMP_EQ r2, r3, r4") == 0);
isa::disasm(ins[9], buf, sizeof buf);
CHECK(std::strcmp(buf, "JF r2, +2") == 0); // 假 → else（[12]）
isa::disasm(ins[10], buf, sizeof buf);
CHECK(std::strcmp(buf, "LOADK r1, 3") == 0);
isa::disasm(ins[11], buf, sizeof buf);
CHECK(std::strcmp(buf, "JMP +1") == 0); // → end（[13]）
// ELSE
isa::disasm(ins[12], buf, sizeof buf);
CHECK(std::strcmp(buf, "LOADK r1, 4") == 0);
isa::disasm(ins[13], buf, sizeof buf);
CHECK(std::strcmp(buf, "RET") == 0);
return true;
}
int main() {
if (!test_case01()) return 1;
if (!test_case02()) return 1;
@@ -356,6 +406,7 @@ int main() {
if (!test_write_input()) return 1;
if (!test_case03()) return 1;
if (!test_not()) return 1;
if (!test_case04()) return 1;
std::printf("codegen_test: %d checks passed\n", g_checks);
return 0;
}