Implement the signals interface for Win32.

Patch provided by Jeff Cohen. Thanks Jeff!

llvm-svn: 16380

lib/System/Win32/Signals.cpp

@@ -2,7 +2,7 @@
 // 
 //                     The LLVM Compiler Infrastructure
 //
-// This file was developed by Reid Spencer and is distributed under the 
+// This file was developed by Jeff Cohen and is distributed under the 
 // University of Illinois Open Source License. See LICENSE.TXT for details.
 // 
 //===----------------------------------------------------------------------===//
@@ -11,27 +11,204 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "Win32.h"
+#include <llvm/System/Signals.h>
+#include <vector>
+
+#include "dbghelp.h"
+#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<std::string> *FilesToRemove = NULL;
+static std::vector<llvm::sys::Path> *DirectoriesToRemove = NULL;
+static bool RegisteredUnhandledExceptionFilter = false;
+static CRITICAL_SECTION CriticalSection;
+
 namespace llvm {
-using namespace sys;
 
 //===----------------------------------------------------------------------===//
 //=== WARNING: Implementation here must contain only Win32 specific code 
-//===          and must not be generic UNIX code (see ../Unix/Signals.cpp)
+//===          and must not be UNIX code
 //===----------------------------------------------------------------------===//
 
+
+static void RegisterHandler() { 
+  if (RegisteredUnhandledExceptionFilter)
+    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;
+  SetUnhandledExceptionFilter(LLVMUnhandledExceptionFilter);
+  SetConsoleCtrlHandler(LLVMConsoleCtrlHandler, TRUE);
+
+  // IMPORTANT NOTE: Caller must call LeaveCriticalSection(&CriticalSection) or
+  // else multi-threading problems will ensue.
+}
+
 // RemoveFileOnSignal - The public API
-void llvm::RemoveFileOnSignal(const std::string &Filename) {
+void sys::RemoveFileOnSignal(const std::string &Filename) {
+  RegisterHandler();
+
+  if (FilesToRemove == NULL)
+    FilesToRemove = new std::vector<std::string>;
+
+  FilesToRemove->push_back(Filename);
+
+  LeaveCriticalSection(&CriticalSection);
 }
 
 // RemoveDirectoryOnSignal - The public API
-void llvm::RemoveDirectoryOnSignal(const llvm::sys::Path& path) {
+void sys::RemoveDirectoryOnSignal(const sys::Path& path) {
+  RegisterHandler();
+
+  if (path.is_directory()) {
+    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 llvm::PrintStackTraceOnErrorSignal() {
+void sys::PrintStackTraceOnErrorSignal() {
+  RegisterHandler();
+  LeaveCriticalSection(&CriticalSection);
 }
 
 }
 
+static void Cleanup() {
+  EnterCriticalSection(&CriticalSection);
+
+  if (FilesToRemove != NULL)
+    while (!FilesToRemove->empty()) {
+      try {
+        std::remove(FilesToRemove->back().c_str());
+      } catch (...) {
+      }
+      FilesToRemove->pop_back();
+    }
+
+  if (DirectoriesToRemove != NULL)
+    while (!DirectoriesToRemove->empty()) {
+      try {
+        DirectoriesToRemove->back().destroy_directory(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(GetCurrentProcess(), 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, "%04X:%08X", ep->ContextRecord->SegCs, 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)) {
+        fputc('\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.
+  return EXCEPTION_CONTINUE_SEARCH;
+}
+
+static BOOL WINAPI LLVMConsoleCtrlHandler(DWORD dwCtrlType) {
+  Cleanup();
+
+  // Allow normal processing to take place.
+  return FALSE;
+}
+
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