3d4bba302d
See RFC for background: http://lists.llvm.org/pipermail/llvm-dev/2020-June/142744.html Follow on companion to the clang/llvm instrumentation support in D85948 and committed earlier. This patch adds the compiler-rt runtime support for the memory profiling. Note that much of this support was cloned from asan (and then greatly simplified and renamed). For example the interactions with the sanitizer_common allocators, error handling, interception, etc. The bulk of the memory profiling specific code can be found in the MemInfoBlock, MemInfoBlockCache, and related classes defined and used in memprof_allocator.cpp. For now, the memory profile is dumped to text (stderr by default, but honors the sanitizer_common log_path flag). It is dumped in either a default verbose format, or an optional terse format. This patch also adds a set of tests for the core functionality. Differential Revision: https://reviews.llvm.org/D87120
59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
// Check that MemProf correctly handles malloc and free hooks.
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// RUN: %clangxx_memprof -O2 %s -o %t && %run %t 2>&1 | FileCheck %s
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#include <sanitizer/allocator_interface.h>
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#include <stdlib.h>
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#include <unistd.h>
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extern "C" {
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const volatile void *global_ptr;
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#define WRITE(s) write(1, s, sizeof(s))
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// Note: avoid calling functions that allocate memory in malloc/free
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// to avoid infinite recursion.
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void __sanitizer_malloc_hook(const volatile void *ptr, size_t sz) {
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if (__sanitizer_get_ownership(ptr) && sz == 4) {
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WRITE("MallocHook\n");
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global_ptr = ptr;
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}
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}
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void __sanitizer_free_hook(const volatile void *ptr) {
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if (__sanitizer_get_ownership(ptr) && ptr == global_ptr)
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WRITE("FreeHook\n");
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}
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} // extern "C"
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volatile int *x;
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void MallocHook1(const volatile void *ptr, size_t sz) { WRITE("MH1\n"); }
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void MallocHook2(const volatile void *ptr, size_t sz) { WRITE("MH2\n"); }
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void FreeHook1(const volatile void *ptr) { WRITE("FH1\n"); }
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void FreeHook2(const volatile void *ptr) { WRITE("FH2\n"); }
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// Call this function with uninitialized arguments to poison
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// TLS shadow for function parameters before calling operator
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// new and, eventually, user-provided hook.
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__attribute__((noinline)) void allocate(int *unused1, int *unused2) {
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x = new int;
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}
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int main() {
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__sanitizer_install_malloc_and_free_hooks(MallocHook1, FreeHook1);
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__sanitizer_install_malloc_and_free_hooks(MallocHook2, FreeHook2);
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int *undef1, *undef2;
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allocate(undef1, undef2);
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// CHECK: MallocHook
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// CHECK: MH1
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// CHECK: MH2
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// Check that malloc hook was called with correct argument.
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if (global_ptr != (void *)x) {
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_exit(1);
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}
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*x = 0;
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delete x;
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// CHECK: FreeHook
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// CHECK: FH1
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// CHECK: FH2
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return 0;
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}
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