#include "Unix.h"
#include "llvm/ADT/STLExtras.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Mutex.h"
+#include "llvm/Support/Program.h"
#include "llvm/Support/UniqueLock.h"
-#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <string>
#include <vector>
#if HAVE_MACH_MACH_H
#include <mach/mach.h>
#endif
+#if HAVE_LINK_H
+#include <link.h>
+#endif
using namespace llvm;
}
static void RegisterHandlers() {
+ // We need to dereference the signals mutex during handler registration so
+ // that we force its construction. This is to prevent the first use being
+ // during handling an actual signal because you can't safely call new in a
+ // signal handler.
+ *SignalsMutex;
+
// If the handlers are already registered, we're done.
if (NumRegisteredSignals != 0) return;
/// NB: This must be an async signal safe function. It cannot allocate or free
/// memory, even in debug builds.
static void RemoveFilesToRemove() {
+ // Avoid constructing ManagedStatic in the signal handler.
+ // If FilesToRemove is not constructed, there are no files to remove.
+ if (!FilesToRemove.isConstructed())
+ return;
+
// We avoid iterators in case of debug iterators that allocate or release
// memory.
std::vector<std::string>& FilesToRemoveRef = *FilesToRemove;
}
// Otherwise if it is a fault (like SEGV) run any handler.
- std::vector<std::pair<void (*)(void *), void *>>& CallBacksToRunRef =
- *CallBacksToRun;
- for (unsigned i = 0, e = CallBacksToRun->size(); i != e; ++i)
- CallBacksToRunRef[i].first(CallBacksToRunRef[i].second);
+ if (CallBacksToRun.isConstructed()) {
+ auto &CallBacksToRunRef = *CallBacksToRun;
+ for (unsigned i = 0, e = CallBacksToRun->size(); i != e; ++i)
+ CallBacksToRunRef[i].first(CallBacksToRunRef[i].second);
+ }
#ifdef __s390__
// On S/390, certain signals are delivered with PSW Address pointing to
RegisterHandlers();
}
+#if defined(HAVE_BACKTRACE) && defined(ENABLE_BACKTRACES)
+
+#if HAVE_LINK_H && (defined(__linux__) || defined(__FreeBSD__) || \
+ defined(__FreeBSD_kernel__) || defined(__NetBSD__))
+struct DlIteratePhdrData {
+ void **StackTrace;
+ int depth;
+ bool first;
+ const char **modules;
+ intptr_t *offsets;
+ const char *main_exec_name;
+};
+
+static int dl_iterate_phdr_cb(dl_phdr_info *info, size_t size, void *arg) {
+ DlIteratePhdrData *data = (DlIteratePhdrData*)arg;
+ const char *name = data->first ? data->main_exec_name : info->dlpi_name;
+ data->first = false;
+ for (int i = 0; i < info->dlpi_phnum; i++) {
+ const auto *phdr = &info->dlpi_phdr[i];
+ if (phdr->p_type != PT_LOAD)
+ continue;
+ intptr_t beg = info->dlpi_addr + phdr->p_vaddr;
+ intptr_t end = beg + phdr->p_memsz;
+ for (int j = 0; j < data->depth; j++) {
+ if (data->modules[j])
+ continue;
+ intptr_t addr = (intptr_t)data->StackTrace[j];
+ if (beg <= addr && addr < end) {
+ data->modules[j] = name;
+ data->offsets[j] = addr - info->dlpi_addr;
+ }
+ }
+ }
+ return 0;
+}
+
+static bool findModulesAndOffsets(void **StackTrace, int Depth,
+ const char **Modules, intptr_t *Offsets,
+ const char *MainExecutableName) {
+ DlIteratePhdrData data = {StackTrace, Depth, true,
+ Modules, Offsets, MainExecutableName};
+ dl_iterate_phdr(dl_iterate_phdr_cb, &data);
+ return true;
+}
+#else
+static bool findModulesAndOffsets(void **StackTrace, int Depth,
+ const char **Modules, intptr_t *Offsets,
+ const char *MainExecutableName) {
+ return false;
+}
+#endif
+
+static bool printSymbolizedStackTrace(void **StackTrace, int Depth,
+ llvm::raw_ostream &OS) {
+ // FIXME: Subtract necessary number from StackTrace entries to turn return addresses
+ // into actual instruction addresses.
+ // Use llvm-symbolizer tool to symbolize the stack traces.
+ ErrorOr<std::string> LLVMSymbolizerPathOrErr =
+ sys::findProgramByName("llvm-symbolizer");
+ if (!LLVMSymbolizerPathOrErr)
+ return false;
+ const std::string &LLVMSymbolizerPath = *LLVMSymbolizerPathOrErr;
+ // We don't know argv0 or the address of main() at this point, but try
+ // to guess it anyway (it's possible on some platforms).
+ std::string MainExecutableName = sys::fs::getMainExecutable(nullptr, nullptr);
+ if (MainExecutableName.empty() ||
+ MainExecutableName.find("llvm-symbolizer") != std::string::npos)
+ return false;
+
+ std::vector<const char *> Modules(Depth, nullptr);
+ std::vector<intptr_t> Offsets(Depth, 0);
+ if (!findModulesAndOffsets(StackTrace, Depth, Modules.data(), Offsets.data(),
+ MainExecutableName.c_str()))
+ return false;
+ int InputFD;
+ SmallString<32> InputFile, OutputFile;
+ sys::fs::createTemporaryFile("symbolizer-input", "", InputFD, InputFile);
+ sys::fs::createTemporaryFile("symbolizer-output", "", OutputFile);
+ FileRemover InputRemover(InputFile.c_str());
+ FileRemover OutputRemover(OutputFile.c_str());
+
+ {
+ raw_fd_ostream Input(InputFD, true);
+ for (int i = 0; i < Depth; i++) {
+ if (Modules[i])
+ Input << Modules[i] << " " << (void*)Offsets[i] << "\n";
+ }
+ }
+
+ StringRef InputFileStr(InputFile);
+ StringRef OutputFileStr(OutputFile);
+ StringRef StderrFileStr;
+ const StringRef *Redirects[] = {&InputFileStr, &OutputFileStr,
+ &StderrFileStr};
+ const char *Args[] = {"llvm-symbolizer", "--functions=linkage", "--inlining",
+ "--demangle", nullptr};
+ int RunResult =
+ sys::ExecuteAndWait(LLVMSymbolizerPath, Args, nullptr, Redirects);
+ if (RunResult != 0)
+ return false;
+
+ auto OutputBuf = MemoryBuffer::getFile(OutputFile.c_str());
+ if (!OutputBuf)
+ return false;
+ StringRef Output = OutputBuf.get()->getBuffer();
+ SmallVector<StringRef, 32> Lines;
+ Output.split(Lines, "\n");
+ auto CurLine = Lines.begin();
+ int frame_no = 0;
+ for (int i = 0; i < Depth; i++) {
+ if (!Modules[i]) {
+ OS << format("#%d %p\n", frame_no++, StackTrace[i]);
+ continue;
+ }
+ // Read pairs of lines (function name and file/line info) until we
+ // encounter empty line.
+ for (;;) {
+ if (CurLine == Lines.end())
+ return false;
+ StringRef FunctionName = *CurLine++;
+ if (FunctionName.empty())
+ break;
+ OS << format("#%d %p ", frame_no++, StackTrace[i]);
+ if (!FunctionName.startswith("??"))
+ OS << format("%s ", FunctionName.str().c_str());
+ if (CurLine == Lines.end())
+ return false;
+ StringRef FileLineInfo = *CurLine++;
+ if (!FileLineInfo.startswith("??"))
+ OS << format("%s", FileLineInfo.str().c_str());
+ else
+ OS << format("(%s+%p)", Modules[i], (void *)Offsets[i]);
+ OS << "\n";
+ }
+ }
+ return true;
+}
+#endif // defined(HAVE_BACKTRACE) && defined(ENABLE_BACKTRACES)
// PrintStackTrace - In the case of a program crash or fault, print out a stack
// trace so that the user has an indication of why and where we died.
//
// On glibc systems we have the 'backtrace' function, which works nicely, but
// doesn't demangle symbols.
-void llvm::sys::PrintStackTrace(FILE *FD) {
+void llvm::sys::PrintStackTrace(raw_ostream &OS) {
#if defined(HAVE_BACKTRACE) && defined(ENABLE_BACKTRACES)
static void* StackTrace[256];
// Use backtrace() to output a backtrace on Linux systems with glibc.
int depth = backtrace(StackTrace,
static_cast<int>(array_lengthof(StackTrace)));
+ if (printSymbolizedStackTrace(StackTrace, depth, OS))
+ return;
#if HAVE_DLFCN_H && __GNUG__
int width = 0;
for (int i = 0; i < depth; ++i) {
Dl_info dlinfo;
dladdr(StackTrace[i], &dlinfo);
- fprintf(FD, "%-2d", i);
+ OS << format("%-2d", i);
const char* name = strrchr(dlinfo.dli_fname, '/');
- if (!name) fprintf(FD, " %-*s", width, dlinfo.dli_fname);
- else fprintf(FD, " %-*s", width, name+1);
+ if (!name) OS << format(" %-*s", width, dlinfo.dli_fname);
+ else OS << format(" %-*s", width, name+1);
- fprintf(FD, " %#0*lx",
- (int)(sizeof(void*) * 2) + 2, (unsigned long)StackTrace[i]);
+ OS << format(" %#0*lx", (int)(sizeof(void*) * 2) + 2,
+ (unsigned long)StackTrace[i]);
if (dlinfo.dli_sname != nullptr) {
- fputc(' ', FD);
+ OS << ' ';
# if HAVE_CXXABI_H
int res;
char* d = abi::__cxa_demangle(dlinfo.dli_sname, nullptr, nullptr, &res);
# else
char* d = NULL;
# endif
- if (!d) fputs(dlinfo.dli_sname, FD);
- else fputs(d, FD);
+ if (!d) OS << dlinfo.dli_sname;
+ else OS << d;
free(d);
// FIXME: When we move to C++11, use %t length modifier. It's not in
// C++03 and causes gcc to issue warnings. Losing the upper 32 bits of
// the stack offset for a stack dump isn't likely to cause any problems.
- fprintf(FD, " + %u",(unsigned)((char*)StackTrace[i]-
- (char*)dlinfo.dli_saddr));
+ OS << format(" + %u",(unsigned)((char*)StackTrace[i]-
+ (char*)dlinfo.dli_saddr));
}
- fputc('\n', FD);
+ OS << '\n';
}
#else
backtrace_symbols_fd(StackTrace, depth, STDERR_FILENO);
}
static void PrintStackTraceSignalHandler(void *) {
- PrintStackTrace(stderr);
+ PrintStackTrace(llvm::errs());
}
+void llvm::sys::DisableSystemDialogsOnCrash() {}
+
/// PrintStackTraceOnErrorSignal - When an error signal (such as SIGABRT or
/// SIGSEGV) is delivered to the process, print a stack trace and then exit.
-void llvm::sys::PrintStackTraceOnErrorSignal() {
+void llvm::sys::PrintStackTraceOnErrorSignal(bool DisableCrashReporting) {
AddSignalHandler(PrintStackTraceSignalHandler, nullptr);
#if defined(__APPLE__) && defined(ENABLE_CRASH_OVERRIDES)
// Environment variable to disable any kind of crash dialog.
- if (getenv("LLVM_DISABLE_CRASH_REPORT")) {
+ if (DisableCrashReporting || getenv("LLVM_DISABLE_CRASH_REPORT")) {
mach_port_t self = mach_task_self();
exception_mask_t mask = EXC_MASK_CRASH;
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