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/* Copyright 2014-present Facebook, Inc.
* Licensed under the Apache License, Version 2.0 */
#include "watchman.h"
// some versions of dbghelp.h do: typedef enum {}; with no typedef name
#pragma warning(disable: 4091)
#include <Dbghelp.h>
#include <mutex>
static std::once_flag sym_init_once;
static HANDLE proc;
// 4k for a symbol name? Demangled symbols are pretty huge
static constexpr size_t kMaxSymbolLen = 4096;
static void sym_init(void) {
proc = GetCurrentProcess();
SymInitialize(proc, NULL, TRUE);
SymSetOptions(SYMOPT_LOAD_LINES|SYMOPT_FAIL_CRITICAL_ERRORS|
SYMOPT_NO_PROMPTS|SYMOPT_UNDNAME);
}
size_t backtrace(void **frames, size_t n_frames) {
std::call_once(sym_init_once, sym_init);
// Skip the first three frames; they're always going to show
// w_log, log_stack_trace and backtrace
return CaptureStackBackTrace(3, (DWORD)n_frames, frames, NULL);
}
char **backtrace_symbols(void **array, size_t n_frames) {
std::vector<std::string> arr;
size_t i;
union {
SYMBOL_INFO info;
char buf[kMaxSymbolLen];
} sym;
IMAGEHLP_LINE64 line;
// How much space we need to hold the final argv style
// array for the results
size_t totalSize = 0;
std::call_once(sym_init_once, sym_init);
memset(&sym.info, 0, sizeof(sym.info));
sym.info.MaxNameLen = sizeof(sym) - sizeof(sym.info);
sym.info.SizeOfStruct = sizeof(sym.info);
line.SizeOfStruct = sizeof(line);
for (i = 0; i < n_frames; i++) {
char str[kMaxSymbolLen + 128];
DWORD64 addr = (DWORD64)(intptr_t)array[i];
DWORD displacement;
if (!SymFromAddr(proc, addr, 0, &sym.info)) {
snprintf(
sym.info.Name,
sizeof(sym.buf),
"<failed to resolve symbol: %s>",
std::system_category().message(GetLastError()).c_str());
}
if (SymGetLineFromAddr64(proc, addr, &displacement, &line)) {
snprintf(str, sizeof(str), "#%" PRIsize_t " %p %s %s:%u", i,
array[i], sym.info.Name, line.FileName, line.LineNumber);
} else {
snprintf(str, sizeof(str), "#%" PRIsize_t " %p %s", i,
array[i], sym.info.Name);
}
arr.emplace_back(str);
// One pointer, the string content and the trailing NUL byte
totalSize += sizeof(char*) + arr.back().size() + 1;
}
auto strings = (char**)malloc(totalSize + sizeof(char*));
if (!strings) {
return nullptr;
}
auto buf = (char*)(strings + arr.size() + 1);
for (i = 0; i < arr.size(); ++i) {
strings[i] = buf;
memcpy(buf, arr[i].c_str(), arr[i].size() + 1);
buf += arr[i].size() + 1;
}
strings[i] = nullptr;
return strings;
}
size_t backtrace_from_exception(
LPEXCEPTION_POINTERS exception,
void** frames,
size_t n_frames) {
std::call_once(sym_init_once, sym_init);
auto context = exception->ContextRecord;
auto thread = GetCurrentThread();
STACKFRAME64 frame;
DWORD image;
size_t i = 0;
#ifdef _M_IX86
image = IMAGE_FILE_MACHINE_I386;
frame.AddrPC.Offset = context->Eip;
frame.AddrPC.Mode = AddrModeFlat;
frame.AddrFrame.Offset = context->Ebp;
frame.AddrFrame.Mode = AddrModeFlat;
frame.AddrStack.Offset = context->Esp;
frame.AddrStack.Mode = AddrModeFlat;
#elif _M_X64
image = IMAGE_FILE_MACHINE_AMD64;
frame.AddrPC.Offset = context->Rip;
frame.AddrPC.Mode = AddrModeFlat;
frame.AddrFrame.Offset = context->Rsp;
frame.AddrFrame.Mode = AddrModeFlat;
frame.AddrStack.Offset = context->Rsp;
frame.AddrStack.Mode = AddrModeFlat;
#elif _M_IA64
image = IMAGE_FILE_MACHINE_IA64;
frame.AddrPC.Offset = context->StIIP;
frame.AddrPC.Mode = AddrModeFlat;
frame.AddrFrame.Offset = context->IntSp;
frame.AddrFrame.Mode = AddrModeFlat;
frame.AddrBStore.Offset = context->RsBSP;
frame.AddrBStore.Mode = AddrModeFlat;
frame.AddrStack.Offset = context->IntSp;
frame.AddrStack.Mode = AddrModeFlat;
#else
return 0; // No stack trace for you!
#endif
while (i < n_frames && StackWalk64(
image,
proc,
thread,
&frame,
context,
nullptr,
nullptr,
nullptr,
nullptr)) {
frames[i++] = (void*)frame.AddrPC.Offset;
}
return i;
}
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