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-rw-r--r--lib/Support/Unix/Signals.inc266
1 files changed, 209 insertions, 57 deletions
diff --git a/lib/Support/Unix/Signals.inc b/lib/Support/Unix/Signals.inc
index 1841fea..e8f4643 100644
--- a/lib/Support/Unix/Signals.inc
+++ b/lib/Support/Unix/Signals.inc
@@ -14,7 +14,14 @@
#include "Unix.h"
#include "llvm/ADT/STLExtras.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/raw_ostream.h"
#include <algorithm>
#include <string>
#include <vector>
@@ -36,18 +43,22 @@
#if HAVE_MACH_MACH_H
#include <mach/mach.h>
#endif
+#if HAVE_LINK_H
+#include <link.h>
+#endif
using namespace llvm;
static RETSIGTYPE SignalHandler(int Sig); // defined below.
-static SmartMutex<true> SignalsMutex;
+static ManagedStatic<SmartMutex<true> > SignalsMutex;
/// InterruptFunction - The function to call if ctrl-c is pressed.
static void (*InterruptFunction)() = nullptr;
-static std::vector<std::string> FilesToRemove;
-static std::vector<std::pair<void(*)(void*), void*> > CallBacksToRun;
+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
@@ -55,7 +66,6 @@ static std::vector<std::pair<void(*)(void*), void*> > CallBacksToRun;
static const int IntSigs[] = {
SIGHUP, SIGINT, SIGPIPE, SIGTERM, SIGUSR1, SIGUSR2
};
-static const int *const IntSigsEnd = std::end(IntSigs);
// KillSigs - Signals that represent that we have a bug, and our prompt
// termination has been ordered.
@@ -74,7 +84,6 @@ static const int KillSigs[] = {
, SIGEMT
#endif
};
-static const int *const KillSigsEnd = std::end(KillSigs);
static unsigned NumRegisteredSignals = 0;
static struct {
@@ -105,8 +114,8 @@ static void RegisterHandlers() {
// If the handlers are already registered, we're done.
if (NumRegisteredSignals != 0) return;
- std::for_each(IntSigs, IntSigsEnd, RegisterHandler);
- std::for_each(KillSigs, KillSigsEnd, RegisterHandler);
+ for (auto S : IntSigs) RegisterHandler(S);
+ for (auto S : KillSigs) RegisterHandler(S);
}
static void UnregisterHandlers() {
@@ -125,11 +134,12 @@ static void UnregisterHandlers() {
static void RemoveFilesToRemove() {
// We avoid iterators in case of debug iterators that allocate or release
// memory.
- for (unsigned i = 0, e = FilesToRemove.size(); i != e; ++i) {
+ 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 = FilesToRemove[i].c_str();
+ const char *path = FilesToRemoveRef[i].c_str();
// Get the status so we can determine if it's a file or directory. If we
// can't stat the file, ignore it.
@@ -162,28 +172,31 @@ static RETSIGTYPE SignalHandler(int Sig) {
sigfillset(&SigMask);
sigprocmask(SIG_UNBLOCK, &SigMask, nullptr);
- SignalsMutex.acquire();
- RemoveFilesToRemove();
-
- if (std::find(IntSigs, IntSigsEnd, Sig) != IntSigsEnd) {
- if (InterruptFunction) {
- void (*IF)() = InterruptFunction;
- SignalsMutex.release();
- InterruptFunction = nullptr;
- IF(); // run the interrupt function.
+ {
+ unique_lock<SmartMutex<true>> Guard(*SignalsMutex);
+ RemoveFilesToRemove();
+
+ if (std::find(std::begin(IntSigs), std::end(IntSigs), Sig)
+ != std::end(IntSigs)) {
+ if (InterruptFunction) {
+ void (*IF)() = InterruptFunction;
+ Guard.unlock();
+ InterruptFunction = nullptr;
+ IF(); // run the interrupt function.
+ return;
+ }
+
+ Guard.unlock();
+ raise(Sig); // Execute the default handler.
return;
- }
-
- SignalsMutex.release();
- raise(Sig); // Execute the default handler.
- return;
+ }
}
- SignalsMutex.release();
-
// Otherwise if it is a fault (like SEGV) run any handler.
- for (unsigned i = 0, e = CallBacksToRun.size(); i != e; ++i)
- CallBacksToRun[i].first(CallBacksToRun[i].second);
+ 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);
#ifdef __s390__
// On S/390, certain signals are delivered with PSW Address pointing to
@@ -196,37 +209,39 @@ static RETSIGTYPE SignalHandler(int Sig) {
}
void llvm::sys::RunInterruptHandlers() {
- SignalsMutex.acquire();
+ sys::SmartScopedLock<true> Guard(*SignalsMutex);
RemoveFilesToRemove();
- SignalsMutex.release();
}
void llvm::sys::SetInterruptFunction(void (*IF)()) {
- SignalsMutex.acquire();
- InterruptFunction = IF;
- SignalsMutex.release();
+ {
+ sys::SmartScopedLock<true> Guard(*SignalsMutex);
+ InterruptFunction = IF;
+ }
RegisterHandlers();
}
// RemoveFileOnSignal - The public API
bool llvm::sys::RemoveFileOnSignal(StringRef Filename,
std::string* ErrMsg) {
- SignalsMutex.acquire();
- std::string *OldPtr = FilesToRemove.empty() ? nullptr : &FilesToRemove[0];
- FilesToRemove.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 == &FilesToRemove[0])
- FilesToRemove.back().c_str();
- else
- for (unsigned i = 0, e = FilesToRemove.size(); i != e; ++i)
- FilesToRemove[i].c_str();
-
- SignalsMutex.release();
+ {
+ 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();
+ }
RegisterHandlers();
return false;
@@ -234,31 +249,166 @@ bool llvm::sys::RemoveFileOnSignal(StringRef Filename,
// DontRemoveFileOnSignal - The public API
void llvm::sys::DontRemoveFileOnSignal(StringRef Filename) {
- SignalsMutex.acquire();
+ sys::SmartScopedLock<true> Guard(*SignalsMutex);
std::vector<std::string>::reverse_iterator RI =
- std::find(FilesToRemove.rbegin(), FilesToRemove.rend(), Filename);
- std::vector<std::string>::iterator I = FilesToRemove.end();
- if (RI != FilesToRemove.rend())
- I = FilesToRemove.erase(RI.base()-1);
+ std::find(FilesToRemove->rbegin(), FilesToRemove->rend(), Filename);
+ 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)
+ for (std::vector<std::string>::iterator E = FilesToRemove->end(); I != E; ++I)
I->c_str();
-
- SignalsMutex.release();
}
/// AddSignalHandler - Add a function to be called when a signal is delivered
/// to the process. The handler can have a cookie passed to it to identify
/// what instance of the handler it is.
void llvm::sys::AddSignalHandler(void (*FnPtr)(void *), void *Cookie) {
- CallBacksToRun.push_back(std::make_pair(FnPtr, Cookie));
+ CallBacksToRun->push_back(std::make_pair(FnPtr, Cookie));
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, 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.
+ 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]) {
+ 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
// trace so that the user has an indication of why and where we died.
@@ -271,6 +421,8 @@ void llvm::sys::PrintStackTrace(FILE *FD) {
// 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))
+ return;
#if HAVE_DLFCN_H && __GNUG__
int width = 0;
for (int i = 0; i < depth; ++i) {
generated by cgit v1.1 at 2024-05-17 22:02:01 +0000