-//===- Signals.cpp - Signal Handling support ------------------------------===//
+//===- Signals.cpp - Signal Handling support --------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// This file defines some helpful functions for dealing with the possibility of
-// unix signals occuring while your program is running.
+// Unix signals occurring while your program is running.
//
//===----------------------------------------------------------------------===//
-#include "Support/Signals.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Config/config.h"
+#include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Mutex.h"
+#include "llvm/Support/Program.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/StringSaver.h"
+#include "llvm/Support/raw_ostream.h"
#include <vector>
-#include <algorithm>
-#include <cstdlib>
-#include <cstdio>
-#include <signal.h>
-
-static std::vector<std::string> FilesToRemove;
-
-// IntSigs - Signals that may interrupt the program at any time.
-static const int IntSigs[] = {
- SIGHUP, SIGINT, SIGQUIT, SIGKILL, SIGPIPE, SIGTERM, SIGUSR1, SIGUSR2
-};
-static const int *IntSigsEnd = IntSigs + sizeof(IntSigs)/sizeof(IntSigs[0]);
-
-// KillSigs - Signals that are synchronous with the program that will cause it
-// to die.
-static const int KillSigs[] = {
- SIGILL, SIGTRAP, SIGABRT, SIGFPE, SIGBUS, SIGSEGV, SIGSYS, SIGXCPU, SIGXFSZ
-#ifdef SIGEMT
- , SIGEMT
-#endif
-};
-static const int *KillSigsEnd = KillSigs + sizeof(KillSigs)/sizeof(KillSigs[0]);
+namespace llvm {
+using namespace sys;
-// SignalHandler - The signal handler that runs...
-static void SignalHandler(int Sig) {
- while (!FilesToRemove.empty()) {
- std::remove(FilesToRemove.back().c_str());
- FilesToRemove.pop_back();
- }
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only TRULY operating system
+//=== independent code.
+//===----------------------------------------------------------------------===//
+
+static ManagedStatic<std::vector<std::pair<void (*)(void *), void *>>>
+ CallBacksToRun;
+void sys::RunSignalHandlers() {
+ if (!CallBacksToRun.isConstructed())
+ return;
+ for (auto &I : *CallBacksToRun)
+ I.first(I.second);
+ CallBacksToRun->clear();
+}
+}
- if (std::find(IntSigs, IntSigsEnd, Sig) != IntSigsEnd)
- exit(1); // If this is an interrupt signal, exit the program
+using namespace llvm;
- // Otherwise if it is a fault (like SEGV) reissue the signal to die...
- signal(Sig, SIG_DFL);
+static bool findModulesAndOffsets(void **StackTrace, int Depth,
+ const char **Modules, intptr_t *Offsets,
+ const char *MainExecutableName,
+ StringSaver &StrPool);
+
+/// Format a pointer value as hexadecimal. Zero pad it out so its always the
+/// same width.
+static FormattedNumber format_ptr(void *PC) {
+ // Each byte is two hex digits plus 2 for the 0x prefix.
+ unsigned PtrWidth = 2 + 2 * sizeof(void *);
+ return format_hex((uint64_t)PC, PtrWidth);
}
-static void RegisterHandler(int Signal) { signal(Signal, SignalHandler); }
+static bool printSymbolizedStackTrace(void **StackTrace, int Depth,
+ llvm::raw_ostream &OS)
+ LLVM_ATTRIBUTE_USED;
+
+/// Helper that launches llvm-symbolizer and symbolizes a backtrace.
+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;
+
+ BumpPtrAllocator Allocator;
+ StringSaver StrPool(Allocator);
+ 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(), StrPool))
+ 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";
+ }
+ }
-// RemoveFileOnSignal - The public API
-void RemoveFileOnSignal(const std::string &Filename) {
- FilesToRemove.push_back(Filename);
+ StringRef InputFileStr(InputFile);
+ StringRef OutputFileStr(OutputFile);
+ StringRef StderrFileStr;
+ const StringRef *Redirects[] = {&InputFileStr, &OutputFileStr,
+ &StderrFileStr};
+ const char *Args[] = {"llvm-symbolizer", "--functions=linkage", "--inlining",
+#ifdef LLVM_ON_WIN32
+ // Pass --relative-address on Windows so that we don't
+ // have to add ImageBase from PE file.
+ // FIXME: Make this the default for llvm-symbolizer.
+ "--relative-address",
+#endif
+ "--demangle", nullptr};
+ int RunResult =
+ sys::ExecuteAndWait(LLVMSymbolizerPath, Args, nullptr, Redirects);
+ if (RunResult != 0)
+ return false;
- std::for_each(IntSigs, IntSigsEnd, RegisterHandler);
- std::for_each(KillSigs, KillSigsEnd, RegisterHandler);
+ // This report format is based on the sanitizer stack trace printer. See
+ // sanitizer_stacktrace_printer.cc in compiler-rt.
+ 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 << '#' << frame_no++ << ' ' << format_ptr(StackTrace[i]) << '\n';
+ 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 << '#' << frame_no++ << ' ' << format_ptr(StackTrace[i]) << ' ';
+ if (!FunctionName.startswith("??"))
+ OS << FunctionName << ' ';
+ if (CurLine == Lines.end())
+ return false;
+ StringRef FileLineInfo = *CurLine++;
+ if (!FileLineInfo.startswith("??"))
+ OS << FileLineInfo;
+ else
+ OS << "(" << Modules[i] << '+' << format_hex(Offsets[i], 0) << ")";
+ OS << "\n";
+ }
+ }
+ return true;
}
+
+// Include the platform-specific parts of this class.
+#ifdef LLVM_ON_UNIX
+#include "Unix/Signals.inc"
+#endif
+#ifdef LLVM_ON_WIN32
+#include "Windows/Signals.inc"
+#endif
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