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
34 lines
728 B
C++
34 lines
728 B
C++
// Check that free hook doesn't conflict with Realloc.
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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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static void *glob_ptr;
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extern "C" {
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void __sanitizer_free_hook(const volatile void *ptr) {
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if (ptr == glob_ptr) {
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*(int *)ptr = 0;
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write(1, "FreeHook\n", sizeof("FreeHook\n"));
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}
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}
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}
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int main() {
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int *x = (int *)malloc(100);
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x[0] = 42;
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glob_ptr = x;
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int *y = (int *)realloc(x, 200);
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// Verify that free hook was called and didn't spoil the memory.
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if (y[0] != 42) {
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_exit(1);
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}
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write(1, "Passed\n", sizeof("Passed\n"));
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free(y);
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// CHECK: FreeHook
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// CHECK: Passed
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return 0;
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}
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