mirror of
https://github.com/chromium/crashpad.git
synced 2025-03-10 06:36:02 +00:00
5d74f120fc
This change was generated mechanically by running:
find . \( -name \*.cc -or -name \*.mm -or -name \*.h \) \
-and -not -path ./third_party/\* -and -not -path ./out/\* \
-exec sed -i '' -E -e 's/(^|[^_])NULL/\1nullptr/g' {} +
Further manual fix-ups were applied to remove casts of nullptr to other
pointer types where possible, to preserve the intentional use of NULL
(as a short form of MACH_PORT_NULL) in exception_port_tool, and to fix
80-column violations.
https://groups.google.com/a/chromium.org/d/topic/chromium-dev/4mijeJHzxLg/discussion
TEST=*_test
R=rsesek@chromium.org
Review URL: https://codereview.chromium.org/656703002
108 lines
3.9 KiB
C++
108 lines
3.9 KiB
C++
// Copyright 2014 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <mach-o/getsect.h>
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// This is only necessary when building code that might run on systems earlier
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// than 10.7. When building for 10.7 or later, getsectiondata() and
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// getsegmentdata() are always present in libmacho and made available through
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// libSystem. When building for earlier systems, custom definitions of
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// these functions are needed.
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//
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// This file checks the deployment target instead of the SDK. The deployment
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// target is correct because it identifies the earliest possible system that
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// the code being compiled is expected to run on.
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#if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_7
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#include <dlfcn.h>
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#include <stddef.h>
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#include "third_party/apple_cctools/cctools/include/mach-o/getsect.h"
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namespace {
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// Returns a dlopen() handle to the same library that provides the
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// getsectbyname() function. getsectbyname() is always present in libmacho.
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// getsectiondata() and getsegmentdata() are not always present, but when they
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// are, they’re in the same library as getsectbyname(). If the library cannot
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// be found or a handle to it cannot be returned, returns nullptr.
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void* SystemLibMachOHandle() {
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Dl_info info;
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if (!dladdr(reinterpret_cast<void*>(getsectbyname), &info)) {
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return nullptr;
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}
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return dlopen(info.dli_fname, RTLD_LAZY | RTLD_LOCAL);
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}
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// Returns a function pointer to a function in libmacho based on a lookup of
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// that function by symbol name. Returns nullptr if libmacho cannot be found or
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// opened, or if the named symbol cannot be found in libmacho.
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void* LookUpSystemLibMachOSymbol(const char* symbol) {
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static void* dl_handle = SystemLibMachOHandle();
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if (!dl_handle) {
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return nullptr;
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}
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return dlsym(dl_handle, symbol);
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}
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#ifndef __LP64__
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typedef mach_header MachHeader;
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#else
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typedef mach_header_64 MachHeader;
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#endif
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typedef uint8_t*(*GetSectionDataType)(
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const MachHeader*, const char*, const char*, unsigned long*);
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typedef uint8_t*(*GetSegmentDataType)(
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const MachHeader*, const char*, unsigned long*);
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} // namespace
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extern "C" {
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// These implementations look up their functions in libmacho at run time. If
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// the system libmacho provides these functions as it normally does on Mac OS X
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// 10.7 and later, the system’s versions are used directly. Otherwise, the
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// versions in third_party/apple_cctools are used, which are actually just
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// copies of the system’s functions.
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uint8_t* getsectiondata(const MachHeader* mhp,
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const char* segname,
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const char* sectname,
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unsigned long* size) {
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static GetSectionDataType system_getsectiondata =
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reinterpret_cast<GetSectionDataType>(
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LookUpSystemLibMachOSymbol("getsectiondata"));
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if (system_getsectiondata) {
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return system_getsectiondata(mhp, segname, sectname, size);
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}
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return crashpad_getsectiondata(mhp, segname, sectname, size);
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}
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uint8_t* getsegmentdata(
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const MachHeader* mhp, const char* segname, unsigned long* size) {
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static GetSegmentDataType system_getsegmentdata =
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reinterpret_cast<GetSegmentDataType>(
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LookUpSystemLibMachOSymbol("getsegmentdata"));
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if (system_getsegmentdata) {
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return system_getsegmentdata(mhp, segname, size);
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}
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return crashpad_getsegmentdata(mhp, segname, size);
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}
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} // extern "C"
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#endif // MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_7
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