1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/allocation_recorder/crash_client/client.h"
#include "base/debug/allocation_trace.h"
#include "build/build_config.h"
#include "components/allocation_recorder/internal/internal.h"
#include "third_party/crashpad/crashpad/client/annotation.h"
#if BUILDFLAG(IS_ANDROID)
#include "components/crash/core/app/crashpad.h"
#endif
using allocation_recorder::internal::kAnnotationName;
using allocation_recorder::internal::kAnnotationType;
using base::debug::tracer::AllocationTraceRecorder;
namespace allocation_recorder::crash_client {
AllocationTraceRecorder& Initialize() {
// Annotations of Crashpad can have only up to
// crashpad::Annotation::kValueMaxSize bytes. AllocationTraceRecorder usually
// has a much larger size. Due to this fact we use a two staged approach. We
// store the exact address of the Recorder in an annotation and allow Crashpad
// to access this specific address range.
static AllocationTraceRecorder trace_recorder_instance;
// The crashpad annotation ensures that a sequence of N bytes is copied from a
// given address into the crash handler. So, in order to make the address of
// the recorder accessible from the crash handler, we have to store it
// explicitly in a data field that is still alive at crash time. If we used
// the recorder's address directly, we'd end up copying some bytes of the
// recorder only, which doesn't work due to size limitations (see the
// static_assert below).
static AllocationTraceRecorder* recorder_address = &trace_recorder_instance;
// Ensure we take this double indirection approach only when necessary. That
// is the size of AllocationTraceRecorder must exceed the maximum amount of
// data that an annotation can hold.
static_assert(sizeof(trace_recorder_instance) >
crashpad::Annotation::kValueMaxSize);
static crashpad::Annotation allocation_stack_recorder_address(
kAnnotationType, kAnnotationName, static_cast<void*>(&recorder_address));
allocation_stack_recorder_address.SetSize(sizeof(recorder_address));
#if BUILDFLAG(IS_ANDROID)
crash_reporter::AllowMemoryRange(static_cast<void*>(&trace_recorder_instance),
sizeof(trace_recorder_instance));
#endif
return trace_recorder_instance;
}
} // namespace allocation_recorder::crash_client
|
