[NFC][Clang][Interp] Add more test for __builtin_os_log_format_buffer_size

[yronglin]

No description provided.

[llvmbot]

@llvm/pr-subscribers-clang

Author: None (yronglin)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/100566.diff

1 Files Affected:

• (modified) clang/test/AST/Interp/builtins.cpp (+5)

diff --git a/clang/test/AST/Interp/builtins.cpp b/clang/test/AST/Interp/builtins.cpp
index a74b68bb9d89b..9b2b20773be58 100644
--- a/clang/test/AST/Interp/builtins.cpp
+++ b/clang/test/AST/Interp/builtins.cpp
@@ -31,3 +31,8 @@ constexpr bool assume() {
   return true;
 }
 static_assert(assume(), "");
+
+void test_builtin_os_log(void *buf, int i, const char *data) {
+  constexpr int len = __builtin_os_log_format_buffer_size("%d %{public}s %{private}.16P", i, data, data);
+  static_assert(len > 0, "Expect len > 0");
+}

[tbaederr]

Did you check locally that this works with sanitizers enabled?

[yronglin]

Did you check locally that this works with sanitizers enabled?

Yeah, the memory leak issue in #99895 seems to be caused by other floating point builtins in clang/test/CodeGen/builtins.c. The new examples added in this PR do not have any floating point operations. And I've verifyed in my local with address sanitizer enabled.
Clang build with:

cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS=clang -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;compiler-rt;libunwind" -DLLVM_TARGETS_TO_BUILD="X86;AArch64" -DCMAKE_C_FLAGS="-fsanitize=address" -DCMAKE_CXX_FLAGS="-fsanitize=address" -DLLVM_USE_SANITIZER=Address ../llvm-project/llvm

➜  test cat os_format.cpp 
void test_builtin_os_log(void *buf, int i, const char *data) {
  constexpr int len = __builtin_os_log_format_buffer_size("%d %{public}s %{private}.16P", i, data, data);
  static_assert(len > 0, "Expect len > 0");
}
➜  test ../rel/bin/clang++ -c  -fexperimental-new-constant-interpreter ./os_format.cpp
➜  test