febc5ee6a9
-- f9f068aa8a260dc576398e47b8e4540902e41358 by Derek Mauro <dmauro@google.com>: Fix test string with embedded NUL. Currently parses as octal. PiperOrigin-RevId: 237088193 -- d271ffdd3f450f817f6d30e98ff39d439aaf3a98 by Abseil Team <absl-team@google.com>: Make symbolizer examine any mapping with read+exec permission regardless of 'w' bit. PiperOrigin-RevId: 237056461 -- af315f8306d36a7367a452fd0b58cafdbf20719d by Abseil Team <absl-team@google.com>: Switch comments referencing base:: CondVar and Mutex to absl::. PiperOrigin-RevId: 236917884 -- c624d5d1c0bdb917bff5e651ba40599472f84e0e by Gennadiy Rozental <rogeeff@google.com>: Internal change PiperOrigin-RevId: 236898300 -- 3cdc82429af964846d1152f49148abc61d196a4b by Samuel Benzaquen <sbenza@google.com>: Make the `long double` overload if AbslHashValue a template to avoid invalid conversions with implicit operators. This overload was never meant to capture anything other than `long double` and any current caller to it that wasn't a `long double` is potentially a bug. In particular, any type with an implicit `bool` conversion is calling this overload instead of trying to find a hash<> specialization, thus causing pretty bad hash behavior. PiperOrigin-RevId: 236877073 GitOrigin-RevId: f9f068aa8a260dc576398e47b8e4540902e41358 Change-Id: If9cc008dd814f0ca06ed881f612c06575f1f7137
122 lines
4.4 KiB
C++
122 lines
4.4 KiB
C++
// Copyright 2018 The Abseil Authors.
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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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// This file contains internal parts of the Abseil symbolizer.
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// Do not depend on the anything in this file, it may change at anytime.
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#ifndef ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_
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#define ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_
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#include <cstddef>
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#include <cstdint>
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#ifdef ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE
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#error ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE cannot be directly set
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#elif defined(__ELF__) && defined(__GLIBC__) && !defined(__native_client__) && \
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!defined(__asmjs__) && !defined(__wasm__)
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#define ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE 1
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#include <elf.h>
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#include <link.h> // For ElfW() macro.
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#include <functional>
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#include <string>
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namespace absl {
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namespace debugging_internal {
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// Iterates over all sections, invoking callback on each with the section name
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// and the section header.
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//
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// Returns true on success; otherwise returns false in case of errors.
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//
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// This is not async-signal-safe.
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bool ForEachSection(int fd,
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const std::function<bool(const std::string& name,
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const ElfW(Shdr) &)>& callback);
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// Gets the section header for the given name, if it exists. Returns true on
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// success. Otherwise, returns false.
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bool GetSectionHeaderByName(int fd, const char *name, size_t name_len,
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ElfW(Shdr) *out);
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} // namespace debugging_internal
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} // namespace absl
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#endif // ABSL_INTERNAL_HAVE_ELF_SYMBOLIZE
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namespace absl {
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namespace debugging_internal {
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struct SymbolDecoratorArgs {
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// The program counter we are getting symbolic name for.
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const void *pc;
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// 0 for main executable, load address for shared libraries.
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ptrdiff_t relocation;
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// Read-only file descriptor for ELF image covering "pc",
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// or -1 if no such ELF image exists in /proc/self/maps.
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int fd;
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// Output buffer, size.
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// Note: the buffer may not be empty -- default symbolizer may have already
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// produced some output, and earlier decorators may have adorned it in
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// some way. You are free to replace or augment the contents (within the
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// symbol_buf_size limit).
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char *const symbol_buf;
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size_t symbol_buf_size;
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// Temporary scratch space, size.
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// Use that space in preference to allocating your own stack buffer to
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// conserve stack.
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char *const tmp_buf;
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size_t tmp_buf_size;
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// User-provided argument
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void* arg;
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};
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using SymbolDecorator = void (*)(const SymbolDecoratorArgs *);
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// Installs a function-pointer as a decorator. Returns a value less than zero
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// if the system cannot install the decorator. Otherwise, returns a unique
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// identifier corresponding to the decorator. This identifier can be used to
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// uninstall the decorator - See RemoveSymbolDecorator() below.
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int InstallSymbolDecorator(SymbolDecorator decorator, void* arg);
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// Removes a previously installed function-pointer decorator. Parameter "ticket"
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// is the return-value from calling InstallSymbolDecorator().
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bool RemoveSymbolDecorator(int ticket);
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// Remove all installed decorators. Returns true if successful, false if
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// symbolization is currently in progress.
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bool RemoveAllSymbolDecorators(void);
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// Registers an address range to a file mapping.
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//
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// Preconditions:
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// start <= end
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// filename != nullptr
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//
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// Returns true if the file was successfully registered.
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bool RegisterFileMappingHint(
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const void* start, const void* end, uint64_t offset, const char* filename);
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// Looks up the file mapping registered by RegisterFileMappingHint for an
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// address range. If there is one, the file name is stored in *filename and
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// *start and *end are modified to reflect the registered mapping. Returns
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// whether any hint was found.
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bool GetFileMappingHint(const void** start,
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const void** end,
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uint64_t * offset,
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const char** filename);
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} // namespace debugging_internal
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} // namespace absl
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#endif // ABSL_DEBUGGING_INTERNAL_SYMBOLIZE_H_
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