1//===-- memprof_malloc_linux.cpp -----------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file is a part of MemProfiler, a memory profiler.
10//
11// Linux-specific malloc interception.
12// We simply define functions like malloc, free, realloc, etc.
13// They will replace the corresponding libc functions automagically.
14//===----------------------------------------------------------------------===//
15
16#include "sanitizer_common/sanitizer_platform.h"
17#if !SANITIZER_LINUX
18#error Unsupported OS
19#endif
20
21#include "memprof_allocator.h"
22#include "memprof_interceptors.h"
23#include "memprof_internal.h"
24#include "memprof_stack.h"
25#include "sanitizer_common/sanitizer_allocator_checks.h"
26#include "sanitizer_common/sanitizer_allocator_dlsym.h"
27#include "sanitizer_common/sanitizer_errno.h"
28#include "sanitizer_common/sanitizer_tls_get_addr.h"
29
30// ---------------------- Replacement functions ---------------- {{{1
31using namespace __memprof;
32
33struct DlsymAlloc : public DlSymAllocator<DlsymAlloc> {
34 static bool UseImpl() { return memprof_init_is_running; }
35};
36
37INTERCEPTOR(void, free, void *ptr) {
38 if (DlsymAlloc::PointerIsMine(ptr))
39 return DlsymAlloc::Free(ptr);
40 GET_STACK_TRACE_FREE;
41 memprof_free(ptr, stack: &stack, alloc_type: FROM_MALLOC);
42}
43
44#if SANITIZER_INTERCEPT_CFREE
45INTERCEPTOR(void, cfree, void *ptr) {
46 if (DlsymAlloc::PointerIsMine(ptr))
47 return DlsymAlloc::Free(ptr);
48 GET_STACK_TRACE_FREE;
49 memprof_free(ptr, stack: &stack, alloc_type: FROM_MALLOC);
50}
51#endif // SANITIZER_INTERCEPT_CFREE
52
53INTERCEPTOR(void *, malloc, uptr size) {
54 if (DlsymAlloc::Use())
55 return DlsymAlloc::Allocate(size_in_bytes: size);
56 ENSURE_MEMPROF_INITED();
57 GET_STACK_TRACE_MALLOC;
58 return memprof_malloc(size, stack: &stack);
59}
60
61INTERCEPTOR(void *, calloc, uptr nmemb, uptr size) {
62 if (DlsymAlloc::Use())
63 return DlsymAlloc::Callocate(nmemb, size);
64 ENSURE_MEMPROF_INITED();
65 GET_STACK_TRACE_MALLOC;
66 return memprof_calloc(nmemb, size, stack: &stack);
67}
68
69INTERCEPTOR(void *, realloc, void *ptr, uptr size) {
70 if (DlsymAlloc::Use() || DlsymAlloc::PointerIsMine(ptr))
71 return DlsymAlloc::Realloc(ptr, new_size: size);
72 ENSURE_MEMPROF_INITED();
73 GET_STACK_TRACE_MALLOC;
74 return memprof_realloc(p: ptr, size, stack: &stack);
75}
76
77#if SANITIZER_INTERCEPT_REALLOCARRAY
78INTERCEPTOR(void *, reallocarray, void *ptr, uptr nmemb, uptr size) {
79 ENSURE_MEMPROF_INITED();
80 GET_STACK_TRACE_MALLOC;
81 return memprof_reallocarray(p: ptr, nmemb, size, stack: &stack);
82}
83#endif // SANITIZER_INTERCEPT_REALLOCARRAY
84
85#if SANITIZER_INTERCEPT_MEMALIGN
86INTERCEPTOR(void *, memalign, uptr boundary, uptr size) {
87 GET_STACK_TRACE_MALLOC;
88 return memprof_memalign(alignment: boundary, size, stack: &stack, alloc_type: FROM_MALLOC);
89}
90
91INTERCEPTOR(void *, __libc_memalign, uptr boundary, uptr size) {
92 GET_STACK_TRACE_MALLOC;
93 void *res = memprof_memalign(alignment: boundary, size, stack: &stack, alloc_type: FROM_MALLOC);
94 DTLS_on_libc_memalign(ptr: res, size);
95 return res;
96}
97#endif // SANITIZER_INTERCEPT_MEMALIGN
98
99#if SANITIZER_INTERCEPT_ALIGNED_ALLOC
100INTERCEPTOR(void *, aligned_alloc, uptr boundary, uptr size) {
101 GET_STACK_TRACE_MALLOC;
102 return memprof_aligned_alloc(alignment: boundary, size, stack: &stack);
103}
104#endif // SANITIZER_INTERCEPT_ALIGNED_ALLOC
105
106INTERCEPTOR(uptr, malloc_usable_size, void *ptr) {
107 return memprof_malloc_usable_size(ptr);
108}
109
110#if SANITIZER_INTERCEPT_MALLOPT_AND_MALLINFO
111// We avoid including malloc.h for portability reasons.
112// man mallinfo says the fields are "long", but the implementation uses int.
113// It doesn't matter much -- we just need to make sure that the libc's mallinfo
114// is not called.
115struct fake_mallinfo {
116 int x[10];
117};
118
119INTERCEPTOR(struct fake_mallinfo, mallinfo, void) {
120 struct fake_mallinfo res;
121 REAL(memset)(&res, 0, sizeof(res));
122 return res;
123}
124
125INTERCEPTOR(int, mallopt, int cmd, int value) { return 0; }
126#endif // SANITIZER_INTERCEPT_MALLOPT_AND_MALLINFO
127
128INTERCEPTOR(int, posix_memalign, void **memptr, uptr alignment, uptr size) {
129 GET_STACK_TRACE_MALLOC;
130 return memprof_posix_memalign(memptr, alignment, size, stack: &stack);
131}
132
133INTERCEPTOR(void *, valloc, uptr size) {
134 GET_STACK_TRACE_MALLOC;
135 return memprof_valloc(size, stack: &stack);
136}
137
138#if SANITIZER_INTERCEPT_PVALLOC
139INTERCEPTOR(void *, pvalloc, uptr size) {
140 GET_STACK_TRACE_MALLOC;
141 return memprof_pvalloc(size, stack: &stack);
142}
143#endif // SANITIZER_INTERCEPT_PVALLOC
144
145INTERCEPTOR(void, malloc_stats, void) { __memprof_print_accumulated_stats(); }
146
147namespace __memprof {
148void ReplaceSystemMalloc() {}
149} // namespace __memprof
150

source code of compiler-rt/lib/memprof/memprof_malloc_linux.cpp