Creating minidump for uncaught exception on iOS.

This CL adds a minidump_generator that can write a minidump from a NSException
on iOS on an ARM cpu.

 This CL also install an uncaught exception handler on iOS, and use the
previous generator to write minidumps for any uncaught exception.
Review URL: https://breakpad.appspot.com/347001

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@916 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/client/ios/Breakpad.mm

@@ -45,6 +45,7 @@
 #import "client/mac/handler/exception_handler.h"
 #import "client/mac/handler/minidump_generator.h"
 #import "client/ios/Breakpad.h"
+#import "client/ios/handler/ios_exception_minidump_generator.h"
 #import "client/mac/handler/protected_memory_allocator.h"
 
 #import <sys/stat.h>
@@ -174,6 +175,12 @@ class Breakpad {
   bool HandleMinidump(const char *dump_dir,
                       const char *minidump_id);
 
+  // NSException handler
+  static void UncaughtExceptionHandler(NSException *exception);
+
+  // Handle an uncaught NSException.
+  void HandleUncaughtException(NSException *exception);
+
   // Since ExceptionHandler (w/o namespace) is defined as typedef in OSX's
   // MachineExceptions.h, we have to explicitly name the handler.
   google_breakpad::ExceptionHandler *handler_; // The actual handler (STRONG)
@@ -181,8 +188,14 @@ class Breakpad {
   SimpleStringDictionary  *config_params_; // Create parameters (STRONG)
 
   ConfigFile config_file_;
+
+  // A static reference to the current Breakpad instance. Used for handling
+  // NSException.
+  static Breakpad *current_breakpad_;
 };
 
+Breakpad *Breakpad::current_breakpad_ = NULL;
+
 #pragma mark -
 #pragma mark Helper functions
 
@@ -240,12 +253,21 @@ bool Breakpad::HandleMinidumpCallback(const char *dump_dir,
   return breakpad->HandleMinidump(dump_dir, minidump_id);
 }
 
+//=============================================================================
+void Breakpad::UncaughtExceptionHandler(NSException *exception) {
+  NSSetUncaughtExceptionHandler(NULL);
+  if (current_breakpad_) {
+    current_breakpad_->HandleUncaughtException(exception);
+  }
+}
+
 //=============================================================================
 #pragma mark -
 
 //=============================================================================
 bool Breakpad::Initialize(NSDictionary *parameters) {
   // Initialize
+  current_breakpad_ = this;
   config_params_ = NULL;
   handler_ = NULL;
 
@@ -267,11 +289,14 @@ bool Breakpad::Initialize(NSDictionary *parameters) {
           google_breakpad::ExceptionHandler(
               config_params_->GetValueForKey(BREAKPAD_DUMP_DIRECTORY),
               0, &HandleMinidumpCallback, this, true, 0);
+  NSSetUncaughtExceptionHandler(&Breakpad::UncaughtExceptionHandler);
   return true;
 }
 
 //=============================================================================
 Breakpad::~Breakpad() {
+  NSSetUncaughtExceptionHandler(NULL);
+  current_breakpad_ = NULL;
   // Note that we don't use operator delete() on these pointers,
   // since they were allocated by ProtectedMemoryAllocator objects.
   //
@@ -499,6 +524,37 @@ bool Breakpad::HandleMinidump(const char *dump_dir,
 }
 
 //=============================================================================
+void Breakpad::HandleUncaughtException(NSException *exception) {
+  // Generate the minidump.
+  google_breakpad::IosExceptionMinidumpGenerator generator(exception);
+  const char *minidump_path =
+      config_params_->GetValueForKey(BREAKPAD_DUMP_DIRECTORY);
+  std::string minidump_id;
+  std::string minidump_filename = generator.UniqueNameInDirectory(minidump_path,
+                                                                  &minidump_id);
+  generator.Write(minidump_filename.c_str());
+
+  // Copy the config params and our custom parameter. This is necessary for 2
+  // reasons:
+  // 1- config_params_ is protected.
+  // 2- If the application crash while trying to handle this exception, a usual
+  //    report will be generated. This report must not contain these special
+  //    keys.
+  SimpleStringDictionary params = *config_params_;
+  params.SetKeyValue(BREAKPAD_SERVER_PARAMETER_PREFIX "type", "exception");
+  params.SetKeyValue(BREAKPAD_SERVER_PARAMETER_PREFIX "exceptionName",
+                     [[exception name] UTF8String]);
+  params.SetKeyValue(BREAKPAD_SERVER_PARAMETER_PREFIX "exceptionReason",
+                     [[exception reason] UTF8String]);
+
+  // And finally write the config file.
+  ConfigFile config_file;
+  config_file.WriteFile(minidump_path,
+                        &params,
+                        minidump_path,
+                        minidump_id.c_str());
+}
+
 //=============================================================================
 
 #pragma mark -