It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Win32/Signals.inc b/lib/System/Win32/Signals.inc
new file mode 100644
index 0000000..7da0c75
--- /dev/null
+++ b/lib/System/Win32/Signals.inc
@@ -0,0 +1,287 @@
+//===- Win32/Signals.cpp - Win32 Signals Implementation ---------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by Jeff Cohen and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides the Win32 specific implementation of the Signals class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Win32.h"
+#include <stdio.h>
+#include <vector>
+
+#ifdef __MINGW32__
+ #include <imagehlp.h>
+#else
+ #include <dbghelp.h>
+#endif
+#include <psapi.h>
+
+#ifdef __MINGW32__
+ #if ((HAVE_LIBIMAGEHLP != 1) || (HAVE_LIBPSAPI != 1))
+ #error "libimagehlp.a & libpsapi.a should be present"
+ #endif
+#else
+ #pragma comment(lib, "psapi.lib")
+ #pragma comment(lib, "dbghelp.lib")
+#endif
+
+// Forward declare.
+static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep);
+static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType);
+
+// InterruptFunction - The function to call if ctrl-c is pressed.
+static void (*InterruptFunction)() = 0;
+
+static std::vector<llvm::sys::Path> *FilesToRemove = NULL;
+static std::vector<llvm::sys::Path> *DirectoriesToRemove = NULL;
+static bool RegisteredUnhandledExceptionFilter = false;
+static bool CleanupExecuted = false;
+static PTOP_LEVEL_EXCEPTION_FILTER OldFilter = NULL;
+
+// Windows creates a new thread to execute the console handler when an event
+// (such as CTRL/C) occurs. This causes concurrency issues with the above
+// globals which this critical section addresses.
+static CRITICAL_SECTION CriticalSection;
+
+namespace llvm {
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only Win32 specific code
+//=== and must not be UNIX code
+//===----------------------------------------------------------------------===//
+
+
+static void RegisterHandler() {
+ if (RegisteredUnhandledExceptionFilter) {
+ EnterCriticalSection(&CriticalSection);
+ return;
+ }
+
+ // Now's the time to create the critical section. This is the first time
+ // through here, and there's only one thread.
+ InitializeCriticalSection(&CriticalSection);
+
+ // Enter it immediately. Now if someone hits CTRL/C, the console handler
+ // can't proceed until the globals are updated.
+ EnterCriticalSection(&CriticalSection);
+
+ RegisteredUnhandledExceptionFilter = true;
+ OldFilter = SetUnhandledExceptionFilter(LLVMUnhandledExceptionFilter);
+ SetConsoleCtrlHandler(LLVMConsoleCtrlHandler, TRUE);
+
+ // IMPORTANT NOTE: Caller must call LeaveCriticalSection(&CriticalSection) or
+ // else multi-threading problems will ensue.
+}
+
+// RemoveFileOnSignal - The public API
+bool sys::RemoveFileOnSignal(const sys::Path &Filename, std::string* ErrMsg) {
+ RegisterHandler();
+
+ if (CleanupExecuted) {
+ if (ErrMsg)
+ *ErrMsg = "Process terminating -- cannot register for removal";
+ return true;
+ }
+
+ if (FilesToRemove == NULL)
+ FilesToRemove = new std::vector<sys::Path>;
+
+ FilesToRemove->push_back(Filename);
+
+ LeaveCriticalSection(&CriticalSection);
+ return false;
+}
+
+// RemoveDirectoryOnSignal - The public API
+bool sys::RemoveDirectoryOnSignal(const sys::Path& path, std::string* ErrMsg) {
+ // Not a directory?
+ WIN32_FILE_ATTRIBUTE_DATA fi;
+ if (!GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &fi)) {
+ MakeErrMsg(ErrMsg, path.toString() + ": can't get status of file");
+ return true;
+ }
+
+ if (!(fi.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)) {
+ if (ErrMsg)
+ *ErrMsg = path.toString() + ": not a directory";
+ return true;
+ }
+
+ RegisterHandler();
+
+ if (CleanupExecuted) {
+ if (ErrMsg)
+ *ErrMsg = "Process terminating -- cannot register for removal";
+ return true;
+ }
+
+ if (DirectoriesToRemove == NULL)
+ DirectoriesToRemove = new std::vector<sys::Path>;
+ DirectoriesToRemove->push_back(path);
+
+ LeaveCriticalSection(&CriticalSection);
+ return false;
+}
+
+/// PrintStackTraceOnErrorSignal - When an error signal (such as SIBABRT or
+/// SIGSEGV) is delivered to the process, print a stack trace and then exit.
+void sys::PrintStackTraceOnErrorSignal() {
+ RegisterHandler();
+ LeaveCriticalSection(&CriticalSection);
+}
+
+
+void sys::SetInterruptFunction(void (*IF)()) {
+ RegisterHandler();
+ InterruptFunction = IF;
+ LeaveCriticalSection(&CriticalSection);
+}
+}
+
+static void Cleanup() {
+ EnterCriticalSection(&CriticalSection);
+
+ // Prevent other thread from registering new files and directories for
+ // removal, should we be executing because of the console handler callback.
+ CleanupExecuted = true;
+
+ // FIXME: open files cannot be deleted.
+
+ if (FilesToRemove != NULL)
+ while (!FilesToRemove->empty()) {
+ try {
+ FilesToRemove->back().eraseFromDisk();
+ } catch (...) {
+ }
+ FilesToRemove->pop_back();
+ }
+
+ if (DirectoriesToRemove != NULL)
+ while (!DirectoriesToRemove->empty()) {
+ try {
+ DirectoriesToRemove->back().eraseFromDisk(true);
+ } catch (...) {
+ }
+ DirectoriesToRemove->pop_back();
+ }
+
+ LeaveCriticalSection(&CriticalSection);
+}
+
+static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep) {
+ try {
+ Cleanup();
+
+ // Initialize the STACKFRAME structure.
+ STACKFRAME StackFrame;
+ memset(&StackFrame, 0, sizeof(StackFrame));
+
+ StackFrame.AddrPC.Offset = ep->ContextRecord->Eip;
+ StackFrame.AddrPC.Mode = AddrModeFlat;
+ StackFrame.AddrStack.Offset = ep->ContextRecord->Esp;
+ StackFrame.AddrStack.Mode = AddrModeFlat;
+ StackFrame.AddrFrame.Offset = ep->ContextRecord->Ebp;
+ StackFrame.AddrFrame.Mode = AddrModeFlat;
+
+ HANDLE hProcess = GetCurrentProcess();
+ HANDLE hThread = GetCurrentThread();
+
+ // Initialize the symbol handler.
+ SymSetOptions(SYMOPT_DEFERRED_LOADS|SYMOPT_LOAD_LINES);
+ SymInitialize(hProcess, NULL, TRUE);
+
+ while (true) {
+ if (!StackWalk(IMAGE_FILE_MACHINE_I386, hProcess, hThread, &StackFrame,
+ ep->ContextRecord, NULL, SymFunctionTableAccess,
+ SymGetModuleBase, NULL)) {
+ break;
+ }
+
+ if (StackFrame.AddrFrame.Offset == 0)
+ break;
+
+ // Print the PC in hexadecimal.
+ DWORD PC = StackFrame.AddrPC.Offset;
+ fprintf(stderr, "%08X", PC);
+
+ // Print the parameters. Assume there are four.
+ fprintf(stderr, " (0x%08X 0x%08X 0x%08X 0x%08X)", StackFrame.Params[0],
+ StackFrame.Params[1], StackFrame.Params[2], StackFrame.Params[3]);
+
+ // Verify the PC belongs to a module in this process.
+ if (!SymGetModuleBase(hProcess, PC)) {
+ fputs(" <unknown module>\n", stderr);
+ continue;
+ }
+
+ // Print the symbol name.
+ char buffer[512];
+ IMAGEHLP_SYMBOL *symbol = reinterpret_cast<IMAGEHLP_SYMBOL *>(buffer);
+ memset(symbol, 0, sizeof(IMAGEHLP_SYMBOL));
+ symbol->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL);
+ symbol->MaxNameLength = 512 - sizeof(IMAGEHLP_SYMBOL);
+
+ DWORD dwDisp;
+ if (!SymGetSymFromAddr(hProcess, PC, &dwDisp, symbol)) {
+ fputc('\n', stderr);
+ continue;
+ }
+
+ buffer[511] = 0;
+ if (dwDisp > 0)
+ fprintf(stderr, ", %s()+%04d bytes(s)", symbol->Name, dwDisp);
+ else
+ fprintf(stderr, ", %s", symbol->Name);
+
+ // Print the source file and line number information.
+ IMAGEHLP_LINE line;
+ memset(&line, 0, sizeof(line));
+ line.SizeOfStruct = sizeof(line);
+ if (SymGetLineFromAddr(hProcess, PC, &dwDisp, &line)) {
+ fprintf(stderr, ", %s, line %d", line.FileName, line.LineNumber);
+ if (dwDisp > 0)
+ fprintf(stderr, "+%04d byte(s)", dwDisp);
+ }
+
+ fputc('\n', stderr);
+ }
+ } catch (...) {
+ assert(!"Crashed in LLVMUnhandledExceptionFilter");
+ }
+
+ // Allow dialog box to pop up allowing choice to start debugger.
+ if (OldFilter)
+ return (*OldFilter)(ep);
+ else
+ return EXCEPTION_CONTINUE_SEARCH;
+}
+
+static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType) {
+ // We are running in our very own thread, courtesy of Windows.
+ EnterCriticalSection(&CriticalSection);
+ Cleanup();
+
+ // If an interrupt function has been set, go and run one it; otherwise,
+ // the process dies.
+ void (*IF)() = InterruptFunction;
+ InterruptFunction = 0; // Don't run it on another CTRL-C.
+
+ if (IF) {
+ // Note: if the interrupt function throws an exception, there is nothing
+ // to catch it in this thread so it will kill the process.
+ IF(); // Run it now.
+ LeaveCriticalSection(&CriticalSection);
+ return TRUE; // Don't kill the process.
+ }
+
+ // Allow normal processing to take place; i.e., the process dies.
+ LeaveCriticalSection(&CriticalSection);
+ return FALSE;
+}
+