1 files changed, 239 insertions, 0 deletions
diff --git a/llvm/lib/System/Win32/Signals.inc b/llvm/lib/System/Win32/Signals.inc
new file mode 100644
index 00000000000..afe6c8dfa64
--- /dev/null
+++ b/llvm/lib/System/Win32/Signals.inc
@@ -0,0 +1,239 @@
+//===- 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 __MINGW
+#include <imagehlp.h>
+#else
+#include <dbghelp.h>
+#endif
+#include <psapi.h>
+
+#pragma comment(lib, "psapi.lib")
+#pragma comment(lib, "dbghelp.lib")
+
+// Forward declare.
+static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep);
+static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType);
+
+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
+void sys::RemoveFileOnSignal(const sys::Path &Filename) {
+  RegisterHandler();
+
+  if (CleanupExecuted)
+    throw std::string("Process terminating -- cannot register for removal");
+
+  if (FilesToRemove == NULL)
+    FilesToRemove = new std::vector<sys::Path>;
+
+  FilesToRemove->push_back(Filename);
+
+  LeaveCriticalSection(&CriticalSection);
+}
+
+// RemoveDirectoryOnSignal - The public API
+void sys::RemoveDirectoryOnSignal(const sys::Path& path) {
+  RegisterHandler();
+
+  if (CleanupExecuted)
+    throw std::string("Process terminating -- cannot register for removal");
+
+  if (path.isDirectory()) {
+    if (DirectoriesToRemove == NULL)
+      DirectoriesToRemove = new std::vector<sys::Path>;
+
+    DirectoriesToRemove->push_back(path);
+  }
+
+  LeaveCriticalSection(&CriticalSection);
+}
+
+/// 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);
+}
+
+}
+
+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().destroyFile();
+      } catch (...) {
+      }
+      FilesToRemove->pop_back();
+    }
+
+  if (DirectoriesToRemove != NULL)
+    while (!DirectoriesToRemove->empty()) {
+      try {
+        DirectoriesToRemove->back().destroyDirectory(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) {
+  Cleanup();
+
+  // Allow normal processing to take place; i.e., the process dies.
+  return FALSE;
+}
+
+// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab