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
22 lines
717 B
C++
22 lines
717 B
C++
// RUN: %clangxx_memprof -O0 %s -o %t
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// Default is true (free on realloc to 0 size)
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// RUN: %run %t 2>&1 | FileCheck %s
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// RUN: %env_memprof_opts=allocator_frees_and_returns_null_on_realloc_zero=true %run %t 2>&1 | FileCheck %s
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// RUN: %env_memprof_opts=allocator_frees_and_returns_null_on_realloc_zero=false %run %t 2>&1 | FileCheck %s --check-prefix=NO-FREE
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#include <stdio.h>
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#include <stdlib.h>
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int main() {
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void *p = malloc(42);
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p = realloc(p, 0);
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if (p) {
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// NO-FREE: Allocated something on realloc(p, 0)
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fprintf(stderr, "Allocated something on realloc(p, 0)\n");
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} else {
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// CHECK: realloc(p, 0) returned nullptr
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fprintf(stderr, "realloc(p, 0) returned nullptr\n");
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}
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free(p);
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}
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