764 lines
26 KiB
C++
764 lines
26 KiB
C++
//===-- sanitizer_symbolizer_posix_libcdep.cc -----------------------------===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is shared between AddressSanitizer and ThreadSanitizer
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// run-time libraries.
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// POSIX-specific implementation of symbolizer parts.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_platform.h"
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#if SANITIZER_POSIX
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#include "sanitizer_allocator_internal.h"
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#include "sanitizer_common.h"
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#include "sanitizer_flags.h"
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#include "sanitizer_internal_defs.h"
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#include "sanitizer_linux.h"
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#include "sanitizer_placement_new.h"
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#include "sanitizer_procmaps.h"
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#include "sanitizer_symbolizer.h"
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#include "sanitizer_symbolizer_libbacktrace.h"
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <unistd.h>
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// C++ demangling function, as required by Itanium C++ ABI. This is weak,
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// because we do not require a C++ ABI library to be linked to a program
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// using sanitizers; if it's not present, we'll just use the mangled name.
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namespace __cxxabiv1 {
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extern "C" SANITIZER_WEAK_ATTRIBUTE
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char *__cxa_demangle(const char *mangled, char *buffer,
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size_t *length, int *status);
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}
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namespace __sanitizer {
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// Attempts to demangle the name via __cxa_demangle from __cxxabiv1.
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static const char *DemangleCXXABI(const char *name) {
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// FIXME: __cxa_demangle aggressively insists on allocating memory.
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// There's not much we can do about that, short of providing our
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// own demangler (libc++abi's implementation could be adapted so that
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// it does not allocate). For now, we just call it anyway, and we leak
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// the returned value.
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if (__cxxabiv1::__cxa_demangle)
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if (const char *demangled_name =
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__cxxabiv1::__cxa_demangle(name, 0, 0, 0))
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return demangled_name;
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return name;
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}
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// Extracts the prefix of "str" that consists of any characters not
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// present in "delims" string, and copies this prefix to "result", allocating
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// space for it.
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// Returns a pointer to "str" after skipping extracted prefix and first
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// delimiter char.
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static const char *ExtractToken(const char *str, const char *delims,
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char **result) {
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uptr prefix_len = internal_strcspn(str, delims);
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*result = (char*)InternalAlloc(prefix_len + 1);
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internal_memcpy(*result, str, prefix_len);
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(*result)[prefix_len] = '\0';
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const char *prefix_end = str + prefix_len;
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if (*prefix_end != '\0') prefix_end++;
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return prefix_end;
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}
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// Same as ExtractToken, but converts extracted token to integer.
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static const char *ExtractInt(const char *str, const char *delims,
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int *result) {
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char *buff;
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const char *ret = ExtractToken(str, delims, &buff);
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if (buff != 0) {
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*result = (int)internal_atoll(buff);
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}
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InternalFree(buff);
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return ret;
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}
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static const char *ExtractUptr(const char *str, const char *delims,
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uptr *result) {
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char *buff;
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const char *ret = ExtractToken(str, delims, &buff);
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if (buff != 0) {
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*result = (uptr)internal_atoll(buff);
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}
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InternalFree(buff);
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return ret;
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}
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class ExternalSymbolizerInterface {
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public:
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// Can't declare pure virtual functions in sanitizer runtimes:
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// __cxa_pure_virtual might be unavailable.
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virtual char *SendCommand(bool is_data, const char *module_name,
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uptr module_offset) {
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UNIMPLEMENTED();
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}
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};
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// SymbolizerProcess encapsulates communication between the tool and
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// external symbolizer program, running in a different subprocess.
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// SymbolizerProcess may not be used from two threads simultaneously.
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class SymbolizerProcess : public ExternalSymbolizerInterface {
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public:
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explicit SymbolizerProcess(const char *path)
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: path_(path),
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input_fd_(kInvalidFd),
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output_fd_(kInvalidFd),
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times_restarted_(0),
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failed_to_start_(false),
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reported_invalid_path_(false) {
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CHECK(path_);
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CHECK_NE(path_[0], '\0');
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}
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char *SendCommand(bool is_data, const char *module_name, uptr module_offset) {
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for (; times_restarted_ < kMaxTimesRestarted; times_restarted_++) {
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// Start or restart symbolizer if we failed to send command to it.
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if (char *res = SendCommandImpl(is_data, module_name, module_offset))
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return res;
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Restart();
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}
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if (!failed_to_start_) {
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Report("WARNING: Failed to use and restart external symbolizer!\n");
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failed_to_start_ = true;
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}
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return 0;
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}
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private:
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bool Restart() {
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if (input_fd_ != kInvalidFd)
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internal_close(input_fd_);
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if (output_fd_ != kInvalidFd)
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internal_close(output_fd_);
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return StartSymbolizerSubprocess();
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}
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char *SendCommandImpl(bool is_data, const char *module_name,
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uptr module_offset) {
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if (input_fd_ == kInvalidFd || output_fd_ == kInvalidFd)
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return 0;
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CHECK(module_name);
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if (!RenderInputCommand(buffer_, kBufferSize, is_data, module_name,
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module_offset))
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return 0;
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if (!writeToSymbolizer(buffer_, internal_strlen(buffer_)))
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return 0;
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if (!readFromSymbolizer(buffer_, kBufferSize))
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return 0;
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return buffer_;
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}
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bool readFromSymbolizer(char *buffer, uptr max_length) {
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if (max_length == 0)
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return true;
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uptr read_len = 0;
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while (true) {
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uptr just_read = internal_read(input_fd_, buffer + read_len,
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max_length - read_len - 1);
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// We can't read 0 bytes, as we don't expect external symbolizer to close
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// its stdout.
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if (just_read == 0 || just_read == (uptr)-1) {
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Report("WARNING: Can't read from symbolizer at fd %d\n", input_fd_);
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return false;
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}
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read_len += just_read;
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if (ReachedEndOfOutput(buffer, read_len))
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break;
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}
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buffer[read_len] = '\0';
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return true;
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}
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bool writeToSymbolizer(const char *buffer, uptr length) {
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if (length == 0)
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return true;
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uptr write_len = internal_write(output_fd_, buffer, length);
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if (write_len == 0 || write_len == (uptr)-1) {
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Report("WARNING: Can't write to symbolizer at fd %d\n", output_fd_);
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return false;
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}
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return true;
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}
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bool StartSymbolizerSubprocess() {
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if (!FileExists(path_)) {
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if (!reported_invalid_path_) {
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Report("WARNING: invalid path to external symbolizer!\n");
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reported_invalid_path_ = true;
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}
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return false;
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}
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int *infd = NULL;
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int *outfd = NULL;
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// The client program may close its stdin and/or stdout and/or stderr
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// thus allowing socketpair to reuse file descriptors 0, 1 or 2.
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// In this case the communication between the forked processes may be
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// broken if either the parent or the child tries to close or duplicate
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// these descriptors. The loop below produces two pairs of file
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// descriptors, each greater than 2 (stderr).
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int sock_pair[5][2];
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for (int i = 0; i < 5; i++) {
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if (pipe(sock_pair[i]) == -1) {
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for (int j = 0; j < i; j++) {
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internal_close(sock_pair[j][0]);
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internal_close(sock_pair[j][1]);
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}
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Report("WARNING: Can't create a socket pair to start "
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"external symbolizer (errno: %d)\n", errno);
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return false;
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} else if (sock_pair[i][0] > 2 && sock_pair[i][1] > 2) {
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if (infd == NULL) {
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infd = sock_pair[i];
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} else {
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outfd = sock_pair[i];
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for (int j = 0; j < i; j++) {
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if (sock_pair[j] == infd) continue;
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internal_close(sock_pair[j][0]);
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internal_close(sock_pair[j][1]);
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}
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break;
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}
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}
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}
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CHECK(infd);
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CHECK(outfd);
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// Real fork() may call user callbacks registered with pthread_atfork().
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int pid = internal_fork();
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if (pid == -1) {
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// Fork() failed.
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internal_close(infd[0]);
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internal_close(infd[1]);
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internal_close(outfd[0]);
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internal_close(outfd[1]);
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Report("WARNING: failed to fork external symbolizer "
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" (errno: %d)\n", errno);
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return false;
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} else if (pid == 0) {
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// Child subprocess.
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internal_close(STDOUT_FILENO);
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internal_close(STDIN_FILENO);
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internal_dup2(outfd[0], STDIN_FILENO);
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internal_dup2(infd[1], STDOUT_FILENO);
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internal_close(outfd[0]);
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internal_close(outfd[1]);
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internal_close(infd[0]);
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internal_close(infd[1]);
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for (int fd = sysconf(_SC_OPEN_MAX); fd > 2; fd--)
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internal_close(fd);
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ExecuteWithDefaultArgs(path_);
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internal__exit(1);
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}
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// Continue execution in parent process.
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internal_close(outfd[0]);
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internal_close(infd[1]);
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input_fd_ = infd[0];
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output_fd_ = outfd[1];
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// Check that symbolizer subprocess started successfully.
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int pid_status;
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SleepForMillis(kSymbolizerStartupTimeMillis);
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int exited_pid = waitpid(pid, &pid_status, WNOHANG);
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if (exited_pid != 0) {
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// Either waitpid failed, or child has already exited.
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Report("WARNING: external symbolizer didn't start up correctly!\n");
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return false;
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}
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return true;
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}
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virtual bool RenderInputCommand(char *buffer, uptr max_length, bool is_data,
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const char *module_name,
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uptr module_offset) const {
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UNIMPLEMENTED();
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}
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virtual bool ReachedEndOfOutput(const char *buffer, uptr length) const {
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UNIMPLEMENTED();
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}
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virtual void ExecuteWithDefaultArgs(const char *path_to_binary) const {
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UNIMPLEMENTED();
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}
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const char *path_;
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int input_fd_;
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int output_fd_;
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static const uptr kBufferSize = 16 * 1024;
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char buffer_[kBufferSize];
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static const uptr kMaxTimesRestarted = 5;
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static const int kSymbolizerStartupTimeMillis = 10;
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uptr times_restarted_;
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bool failed_to_start_;
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bool reported_invalid_path_;
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};
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// For now we assume the following protocol:
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// For each request of the form
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// <module_name> <module_offset>
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// passed to STDIN, external symbolizer prints to STDOUT response:
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// <function_name>
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// <file_name>:<line_number>:<column_number>
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// <function_name>
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// <file_name>:<line_number>:<column_number>
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// ...
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// <empty line>
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class LLVMSymbolizerProcess : public SymbolizerProcess {
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public:
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explicit LLVMSymbolizerProcess(const char *path) : SymbolizerProcess(path) {}
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private:
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bool RenderInputCommand(char *buffer, uptr max_length, bool is_data,
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const char *module_name, uptr module_offset) const {
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internal_snprintf(buffer, max_length, "%s\"%s\" 0x%zx\n",
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is_data ? "DATA " : "", module_name, module_offset);
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return true;
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}
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bool ReachedEndOfOutput(const char *buffer, uptr length) const {
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// Empty line marks the end of llvm-symbolizer output.
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return length >= 2 && buffer[length - 1] == '\n' &&
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buffer[length - 2] == '\n';
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}
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void ExecuteWithDefaultArgs(const char *path_to_binary) const {
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#if defined(__x86_64__)
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const char* const kSymbolizerArch = "--default-arch=x86_64";
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#elif defined(__i386__)
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const char* const kSymbolizerArch = "--default-arch=i386";
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#elif defined(__powerpc64__) && defined(__BIG_ENDIAN__)
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const char* const kSymbolizerArch = "--default-arch=powerpc64";
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#elif defined(__powerpc64__) && defined(__LITTLE_ENDIAN__)
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const char* const kSymbolizerArch = "--default-arch=powerpc64le";
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#else
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const char* const kSymbolizerArch = "--default-arch=unknown";
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#endif
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const char *const inline_flag = common_flags()->symbolize_inline_frames
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? "--inlining=true"
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: "--inlining=false";
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execl(path_to_binary, path_to_binary, inline_flag, kSymbolizerArch,
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(char *)0);
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}
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};
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class Addr2LineProcess : public SymbolizerProcess {
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public:
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Addr2LineProcess(const char *path, const char *module_name)
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: SymbolizerProcess(path), module_name_(internal_strdup(module_name)) {}
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const char *module_name() const { return module_name_; }
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private:
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bool RenderInputCommand(char *buffer, uptr max_length, bool is_data,
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const char *module_name, uptr module_offset) const {
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if (is_data)
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return false;
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CHECK_EQ(0, internal_strcmp(module_name, module_name_));
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internal_snprintf(buffer, max_length, "0x%zx\n", module_offset);
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return true;
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}
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bool ReachedEndOfOutput(const char *buffer, uptr length) const {
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// Output should consist of two lines.
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int num_lines = 0;
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for (uptr i = 0; i < length; ++i) {
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if (buffer[i] == '\n')
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num_lines++;
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if (num_lines >= 2)
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return true;
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}
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return false;
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}
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void ExecuteWithDefaultArgs(const char *path_to_binary) const {
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execl(path_to_binary, path_to_binary, "-Cfe", module_name_, (char *)0);
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}
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const char *module_name_; // Owned, leaked.
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};
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class Addr2LinePool : public ExternalSymbolizerInterface {
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public:
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explicit Addr2LinePool(const char *addr2line_path,
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LowLevelAllocator *allocator)
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: addr2line_path_(addr2line_path), allocator_(allocator),
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addr2line_pool_(16) {}
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char *SendCommand(bool is_data, const char *module_name, uptr module_offset) {
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if (is_data)
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return 0;
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Addr2LineProcess *addr2line = 0;
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for (uptr i = 0; i < addr2line_pool_.size(); ++i) {
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if (0 ==
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internal_strcmp(module_name, addr2line_pool_[i]->module_name())) {
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addr2line = addr2line_pool_[i];
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break;
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}
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}
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if (!addr2line) {
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addr2line =
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new(*allocator_) Addr2LineProcess(addr2line_path_, module_name);
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addr2line_pool_.push_back(addr2line);
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}
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return addr2line->SendCommand(is_data, module_name, module_offset);
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}
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private:
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const char *addr2line_path_;
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LowLevelAllocator *allocator_;
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InternalMmapVector<Addr2LineProcess*> addr2line_pool_;
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};
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#if SANITIZER_SUPPORTS_WEAK_HOOKS
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extern "C" {
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SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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bool __sanitizer_symbolize_code(const char *ModuleName, u64 ModuleOffset,
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char *Buffer, int MaxLength);
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SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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bool __sanitizer_symbolize_data(const char *ModuleName, u64 ModuleOffset,
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char *Buffer, int MaxLength);
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SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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void __sanitizer_symbolize_flush();
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SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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int __sanitizer_symbolize_demangle(const char *Name, char *Buffer,
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int MaxLength);
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} // extern "C"
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class InternalSymbolizer {
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public:
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typedef bool (*SanitizerSymbolizeFn)(const char*, u64, char*, int);
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static InternalSymbolizer *get(LowLevelAllocator *alloc) {
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if (__sanitizer_symbolize_code != 0 &&
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__sanitizer_symbolize_data != 0) {
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return new(*alloc) InternalSymbolizer();
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}
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return 0;
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}
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char *SendCommand(bool is_data, const char *module_name, uptr module_offset) {
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SanitizerSymbolizeFn symbolize_fn = is_data ? __sanitizer_symbolize_data
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: __sanitizer_symbolize_code;
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if (symbolize_fn(module_name, module_offset, buffer_, kBufferSize))
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return buffer_;
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return 0;
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}
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void Flush() {
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if (__sanitizer_symbolize_flush)
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__sanitizer_symbolize_flush();
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}
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const char *Demangle(const char *name) {
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if (__sanitizer_symbolize_demangle) {
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for (uptr res_length = 1024;
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res_length <= InternalSizeClassMap::kMaxSize;) {
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char *res_buff = static_cast<char*>(InternalAlloc(res_length));
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uptr req_length =
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__sanitizer_symbolize_demangle(name, res_buff, res_length);
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if (req_length > res_length) {
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res_length = req_length + 1;
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InternalFree(res_buff);
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continue;
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}
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return res_buff;
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}
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}
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return name;
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}
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private:
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InternalSymbolizer() { }
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static const int kBufferSize = 16 * 1024;
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static const int kMaxDemangledNameSize = 1024;
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char buffer_[kBufferSize];
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};
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#else // SANITIZER_SUPPORTS_WEAK_HOOKS
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class InternalSymbolizer {
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public:
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static InternalSymbolizer *get(LowLevelAllocator *alloc) { return 0; }
|
|
char *SendCommand(bool is_data, const char *module_name, uptr module_offset) {
|
|
return 0;
|
|
}
|
|
void Flush() { }
|
|
const char *Demangle(const char *name) { return name; }
|
|
};
|
|
|
|
#endif // SANITIZER_SUPPORTS_WEAK_HOOKS
|
|
|
|
class POSIXSymbolizer : public Symbolizer {
|
|
public:
|
|
POSIXSymbolizer(ExternalSymbolizerInterface *external_symbolizer,
|
|
InternalSymbolizer *internal_symbolizer,
|
|
LibbacktraceSymbolizer *libbacktrace_symbolizer)
|
|
: Symbolizer(),
|
|
external_symbolizer_(external_symbolizer),
|
|
internal_symbolizer_(internal_symbolizer),
|
|
libbacktrace_symbolizer_(libbacktrace_symbolizer) {}
|
|
|
|
uptr SymbolizePC(uptr addr, AddressInfo *frames, uptr max_frames) {
|
|
BlockingMutexLock l(&mu_);
|
|
if (max_frames == 0)
|
|
return 0;
|
|
const char *module_name;
|
|
uptr module_offset;
|
|
if (!FindModuleNameAndOffsetForAddress(addr, &module_name, &module_offset))
|
|
return 0;
|
|
// First, try to use libbacktrace symbolizer (if it's available).
|
|
if (libbacktrace_symbolizer_ != 0) {
|
|
mu_.CheckLocked();
|
|
uptr res = libbacktrace_symbolizer_->SymbolizeCode(
|
|
addr, frames, max_frames, module_name, module_offset);
|
|
if (res > 0)
|
|
return res;
|
|
}
|
|
const char *str = SendCommand(false, module_name, module_offset);
|
|
if (str == 0) {
|
|
// Symbolizer was not initialized or failed. Fill only data
|
|
// about module name and offset.
|
|
AddressInfo *info = &frames[0];
|
|
info->Clear();
|
|
info->FillAddressAndModuleInfo(addr, module_name, module_offset);
|
|
return 1;
|
|
}
|
|
uptr frame_id = 0;
|
|
for (frame_id = 0; frame_id < max_frames; frame_id++) {
|
|
AddressInfo *info = &frames[frame_id];
|
|
char *function_name = 0;
|
|
str = ExtractToken(str, "\n", &function_name);
|
|
CHECK(function_name);
|
|
if (function_name[0] == '\0') {
|
|
// There are no more frames.
|
|
break;
|
|
}
|
|
info->Clear();
|
|
info->FillAddressAndModuleInfo(addr, module_name, module_offset);
|
|
info->function = function_name;
|
|
// Parse <file>:<line>:<column> buffer.
|
|
char *file_line_info = 0;
|
|
str = ExtractToken(str, "\n", &file_line_info);
|
|
CHECK(file_line_info);
|
|
const char *line_info = ExtractToken(file_line_info, ":", &info->file);
|
|
line_info = ExtractInt(line_info, ":", &info->line);
|
|
line_info = ExtractInt(line_info, "", &info->column);
|
|
InternalFree(file_line_info);
|
|
|
|
// Functions and filenames can be "??", in which case we write 0
|
|
// to address info to mark that names are unknown.
|
|
if (0 == internal_strcmp(info->function, "??")) {
|
|
InternalFree(info->function);
|
|
info->function = 0;
|
|
}
|
|
if (0 == internal_strcmp(info->file, "??")) {
|
|
InternalFree(info->file);
|
|
info->file = 0;
|
|
}
|
|
}
|
|
if (frame_id == 0) {
|
|
// Make sure we return at least one frame.
|
|
AddressInfo *info = &frames[0];
|
|
info->Clear();
|
|
info->FillAddressAndModuleInfo(addr, module_name, module_offset);
|
|
frame_id = 1;
|
|
}
|
|
return frame_id;
|
|
}
|
|
|
|
bool SymbolizeData(uptr addr, DataInfo *info) {
|
|
BlockingMutexLock l(&mu_);
|
|
LoadedModule *module = FindModuleForAddress(addr);
|
|
if (module == 0)
|
|
return false;
|
|
const char *module_name = module->full_name();
|
|
uptr module_offset = addr - module->base_address();
|
|
info->Clear();
|
|
info->module = internal_strdup(module_name);
|
|
info->module_offset = module_offset;
|
|
// First, try to use libbacktrace symbolizer (if it's available).
|
|
if (libbacktrace_symbolizer_ != 0) {
|
|
mu_.CheckLocked();
|
|
if (libbacktrace_symbolizer_->SymbolizeData(info))
|
|
return true;
|
|
}
|
|
const char *str = SendCommand(true, module_name, module_offset);
|
|
if (str == 0)
|
|
return true;
|
|
str = ExtractToken(str, "\n", &info->name);
|
|
str = ExtractUptr(str, " ", &info->start);
|
|
str = ExtractUptr(str, "\n", &info->size);
|
|
info->start += module->base_address();
|
|
return true;
|
|
}
|
|
|
|
bool GetModuleNameAndOffsetForPC(uptr pc, const char **module_name,
|
|
uptr *module_address) {
|
|
BlockingMutexLock l(&mu_);
|
|
return FindModuleNameAndOffsetForAddress(pc, module_name, module_address);
|
|
}
|
|
|
|
bool CanReturnFileLineInfo() {
|
|
return internal_symbolizer_ != 0 || external_symbolizer_ != 0 ||
|
|
libbacktrace_symbolizer_ != 0;
|
|
}
|
|
|
|
void Flush() {
|
|
BlockingMutexLock l(&mu_);
|
|
if (internal_symbolizer_ != 0) {
|
|
SymbolizerScope sym_scope(this);
|
|
internal_symbolizer_->Flush();
|
|
}
|
|
}
|
|
|
|
const char *Demangle(const char *name) {
|
|
BlockingMutexLock l(&mu_);
|
|
// Run hooks even if we don't use internal symbolizer, as cxxabi
|
|
// demangle may call system functions.
|
|
SymbolizerScope sym_scope(this);
|
|
// Try to use libbacktrace demangler (if available).
|
|
if (libbacktrace_symbolizer_ != 0) {
|
|
if (const char *demangled = libbacktrace_symbolizer_->Demangle(name))
|
|
return demangled;
|
|
}
|
|
if (internal_symbolizer_ != 0)
|
|
return internal_symbolizer_->Demangle(name);
|
|
return DemangleCXXABI(name);
|
|
}
|
|
|
|
void PrepareForSandboxing() {
|
|
#if SANITIZER_LINUX && !SANITIZER_ANDROID
|
|
BlockingMutexLock l(&mu_);
|
|
// Cache /proc/self/exe on Linux.
|
|
CacheBinaryName();
|
|
#endif
|
|
}
|
|
|
|
private:
|
|
char *SendCommand(bool is_data, const char *module_name, uptr module_offset) {
|
|
mu_.CheckLocked();
|
|
// First, try to use internal symbolizer.
|
|
if (internal_symbolizer_) {
|
|
SymbolizerScope sym_scope(this);
|
|
return internal_symbolizer_->SendCommand(is_data, module_name,
|
|
module_offset);
|
|
}
|
|
// Otherwise, fall back to external symbolizer.
|
|
if (external_symbolizer_) {
|
|
SymbolizerScope sym_scope(this);
|
|
return external_symbolizer_->SendCommand(is_data, module_name,
|
|
module_offset);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
LoadedModule *FindModuleForAddress(uptr address) {
|
|
mu_.CheckLocked();
|
|
bool modules_were_reloaded = false;
|
|
if (modules_ == 0 || !modules_fresh_) {
|
|
modules_ = (LoadedModule*)(symbolizer_allocator_.Allocate(
|
|
kMaxNumberOfModuleContexts * sizeof(LoadedModule)));
|
|
CHECK(modules_);
|
|
n_modules_ = GetListOfModules(modules_, kMaxNumberOfModuleContexts,
|
|
/* filter */ 0);
|
|
CHECK_GT(n_modules_, 0);
|
|
CHECK_LT(n_modules_, kMaxNumberOfModuleContexts);
|
|
modules_fresh_ = true;
|
|
modules_were_reloaded = true;
|
|
}
|
|
for (uptr i = 0; i < n_modules_; i++) {
|
|
if (modules_[i].containsAddress(address)) {
|
|
return &modules_[i];
|
|
}
|
|
}
|
|
// Reload the modules and look up again, if we haven't tried it yet.
|
|
if (!modules_were_reloaded) {
|
|
// FIXME: set modules_fresh_ from dlopen()/dlclose() interceptors.
|
|
// It's too aggressive to reload the list of modules each time we fail
|
|
// to find a module for a given address.
|
|
modules_fresh_ = false;
|
|
return FindModuleForAddress(address);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
bool FindModuleNameAndOffsetForAddress(uptr address, const char **module_name,
|
|
uptr *module_offset) {
|
|
mu_.CheckLocked();
|
|
LoadedModule *module = FindModuleForAddress(address);
|
|
if (module == 0)
|
|
return false;
|
|
*module_name = module->full_name();
|
|
*module_offset = address - module->base_address();
|
|
return true;
|
|
}
|
|
|
|
// 16K loaded modules should be enough for everyone.
|
|
static const uptr kMaxNumberOfModuleContexts = 1 << 14;
|
|
LoadedModule *modules_; // Array of module descriptions is leaked.
|
|
uptr n_modules_;
|
|
// If stale, need to reload the modules before looking up addresses.
|
|
bool modules_fresh_;
|
|
BlockingMutex mu_;
|
|
|
|
ExternalSymbolizerInterface *external_symbolizer_; // Leaked.
|
|
InternalSymbolizer *const internal_symbolizer_; // Leaked.
|
|
LibbacktraceSymbolizer *libbacktrace_symbolizer_; // Leaked.
|
|
};
|
|
|
|
Symbolizer *Symbolizer::PlatformInit() {
|
|
if (!common_flags()->symbolize) {
|
|
return new(symbolizer_allocator_) POSIXSymbolizer(0, 0, 0);
|
|
}
|
|
InternalSymbolizer* internal_symbolizer =
|
|
InternalSymbolizer::get(&symbolizer_allocator_);
|
|
ExternalSymbolizerInterface *external_symbolizer = 0;
|
|
LibbacktraceSymbolizer *libbacktrace_symbolizer = 0;
|
|
|
|
if (!internal_symbolizer) {
|
|
libbacktrace_symbolizer =
|
|
LibbacktraceSymbolizer::get(&symbolizer_allocator_);
|
|
if (!libbacktrace_symbolizer) {
|
|
const char *path_to_external = common_flags()->external_symbolizer_path;
|
|
if (path_to_external && path_to_external[0] == '\0') {
|
|
// External symbolizer is explicitly disabled. Do nothing.
|
|
} else {
|
|
// Find path to llvm-symbolizer if it's not provided.
|
|
if (!path_to_external)
|
|
path_to_external = FindPathToBinary("llvm-symbolizer");
|
|
if (path_to_external) {
|
|
external_symbolizer = new(symbolizer_allocator_)
|
|
LLVMSymbolizerProcess(path_to_external);
|
|
} else if (common_flags()->allow_addr2line) {
|
|
// If llvm-symbolizer is not found, try to use addr2line.
|
|
if (const char *addr2line_path = FindPathToBinary("addr2line")) {
|
|
external_symbolizer = new(symbolizer_allocator_)
|
|
Addr2LinePool(addr2line_path, &symbolizer_allocator_);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return new(symbolizer_allocator_) POSIXSymbolizer(
|
|
external_symbolizer, internal_symbolizer, libbacktrace_symbolizer);
|
|
}
|
|
|
|
} // namespace __sanitizer
|
|
|
|
#endif // SANITIZER_POSIX
|