#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/raw_ostream.h"
#include <algorithm>
#include <string>
-#include <vector>
#if HAVE_EXECINFO_H
# include <execinfo.h> // For backtrace().
#endif
static void (*InterruptFunction)() = nullptr;
static ManagedStatic<std::vector<std::string>> FilesToRemove;
-static ManagedStatic<std::vector<std::pair<void (*)(void *), void *>>>
- CallBacksToRun;
// IntSigs - Signals that represent requested termination. There's no bug
// or failure, or if there is, it's not our direct responsibility. For whatever
}
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;
for (unsigned i = 0, e = FilesToRemoveRef.size(); i != e; ++i) {
- // We rely on a std::string implementation for which repeated calls to
- // 'c_str()' don't allocate memory. We pre-call 'c_str()' on all of these
- // strings to try to ensure this is safe.
const char *path = FilesToRemoveRef[i].c_str();
// Get the status so we can determine if it's a file or directory. If we
// super-user permissions.
if (!S_ISREG(buf.st_mode))
continue;
-
+
// Otherwise, remove the file. We ignore any errors here as there is nothing
// else we can do.
unlink(path);
}
// 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);
+ llvm::sys::RunSignalHandlers();
#ifdef __s390__
// On S/390, certain signals are delivered with PSW Address pointing to
std::string* ErrMsg) {
{
sys::SmartScopedLock<true> Guard(*SignalsMutex);
- std::vector<std::string>& FilesToRemoveRef = *FilesToRemove;
- std::string *OldPtr =
- FilesToRemoveRef.empty() ? nullptr : &FilesToRemoveRef[0];
- FilesToRemoveRef.push_back(Filename);
-
- // We want to call 'c_str()' on every std::string in this vector so that if
- // the underlying implementation requires a re-allocation, it happens here
- // rather than inside of the signal handler. If we see the vector grow, we
- // have to call it on every entry. If it remains in place, we only need to
- // call it on the latest one.
- if (OldPtr == &FilesToRemoveRef[0])
- FilesToRemoveRef.back().c_str();
- else
- for (unsigned i = 0, e = FilesToRemoveRef.size(); i != e; ++i)
- FilesToRemoveRef[i].c_str();
+ FilesToRemove->push_back(Filename);
}
RegisterHandlers();
std::vector<std::string>::iterator I = FilesToRemove->end();
if (RI != FilesToRemove->rend())
I = FilesToRemove->erase(RI.base()-1);
-
- // We need to call c_str() on every element which would have been moved by
- // the erase. These elements, in a C++98 implementation where c_str()
- // requires a reallocation on the first call may have had the call to c_str()
- // made on insertion become invalid by being copied down an element.
- for (std::vector<std::string>::iterator E = FilesToRemove->end(); I != E; ++I)
- I->c_str();
}
/// AddSignalHandler - Add a function to be called when a signal is delivered
static bool findModulesAndOffsets(void **StackTrace, int Depth,
const char **Modules, intptr_t *Offsets,
- const char *MainExecutableName) {
+ const char *MainExecutableName,
+ StringSaver &StrPool) {
DlIteratePhdrData data = {StackTrace, Depth, true,
Modules, Offsets, MainExecutableName};
dl_iterate_phdr(dl_iterate_phdr_cb, &data);
return false;
}
#endif
-
-static bool printSymbolizedStackTrace(void **StackTrace, int Depth, FILE *FD) {
- // FIXME: Subtract necessary number from StackTrace entries to turn return addresses
- // into actual instruction addresses.
- // Use llvm-symbolizer tool to symbolize the stack traces.
- std::string LLVMSymbolizerPath = sys::FindProgramByName("llvm-symbolizer");
- if (LLVMSymbolizerPath.empty())
- return false;
- // 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]) {
- fprintf(FD, "#%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;
- fprintf(FD, "#%d %p ", frame_no++, StackTrace[i]);
- if (!FunctionName.startswith("??"))
- fprintf(FD, "%s ", FunctionName.str().c_str());
- if (CurLine == Lines.end())
- return false;
- StringRef FileLineInfo = *CurLine++;
- if (!FileLineInfo.startswith("??"))
- fprintf(FD, "%s", FileLineInfo.str().c_str());
- else
- fprintf(FD, "(%s+%p)", Modules[i], (void *)Offsets[i]);
- fprintf(FD, "\n");
- }
- }
- return true;
-}
#endif // defined(HAVE_BACKTRACE) && defined(ENABLE_BACKTRACES)
// PrintStackTrace - In the case of a program crash or fault, print out a stack
//
// 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, FD))
+ if (printSymbolizedStackTrace(StackTrace, depth, OS))
return;
#if HAVE_DLFCN_H && __GNUG__
int width = 0;
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;