Bug 397381 - Enable @try/@catch/@finally for Cocoa widgets r=josh sr+a1.9=roc

widget/src/cocoa/Makefile.in

@@ -182,5 +182,6 @@ LDFLAGS	+= \
 	$(NULL)
 
 CXXFLAGS += \
-  -DUSE_COCOA \
-  $(NULL)
+	-DUSE_COCOA \
+	-fobjc-exceptions \
+	$(NULL)

widget/src/cocoa/nsClipboard.mm

@@ -48,6 +48,7 @@
 #include "nsStringStream.h"
 #include "nsDragService.h"
 #include "nsEscape.h"
+#include "nsPrintfCString.h"
 
 // Screenshots use the (undocumented) png pasteboard type.
 #define IMAGE_PASTEBOARD_TYPES NSTIFFPboardType, @"Apple PNG pasteboard type", nil
@@ -210,17 +211,6 @@ nsClipboard::GetNativeClipboardData(nsITransferable* aTransferable, PRInt32 aWhi
       if (!type)
         continue;
 
-      // Read data off the clipboard, make sure to catch any exceptions (timeouts)
-      // XXX should convert to @try/@catch someday?
-      NSData *pasteboardData = nil;
-      NS_DURING
-        pasteboardData = [cocoaPasteboard dataForType:type];
-      NS_HANDLER
-        NS_ASSERTION(0, "Exception raised while getting data from the pasteboard.");
-      NS_ENDHANDLER
-      if (!pasteboardData)
-        continue;
-
       // Figure out what type we're converting to
       CFStringRef outputType = NULL; 
       if (flavorStr.EqualsLiteral(kJPEGImageMime))
@@ -232,6 +222,16 @@ nsClipboard::GetNativeClipboardData(nsITransferable* aTransferable, PRInt32 aWhi
       else
         continue;
 
+      // Read data off the clipboard
+      NSData *pasteboardData = nil;
+      @try {
+        pasteboardData = [cocoaPasteboard dataForType:type];
+      } @catch (NSException* e) {
+        NS_WARNING(nsPrintfCString(256, "Exception raised while getting data from the pasteboard: \"%s - %s\"", 
+                                   [[e name] UTF8String], [[e reason] UTF8String]).get());
+        continue;
+      }
+
       // Use ImageIO to interpret the data on the clipboard and transcode.
       // Note that ImageIO, like all CF APIs, allows NULLs to propagate freely
       // and safely in most cases (like ObjC). A notable exception is CFRelease.

widget/src/cocoa/nsNativeThemeCocoa.mm

@@ -189,13 +189,14 @@ nsNativeThemeCocoa::DrawButton(CGContextRef cgContext, ThemeButtonKind inKind,
     drawFrame.size.height = offscreenHeight - NATIVE_PUSH_BUTTON_HEIGHT_DIFF;
 
     // draw into offscreen image
-    NS_DURING
+    @try {
       [image lockFocus];
-    NS_HANDLER
-      NS_ASSERTION(0, "Could not lock focus on offscreen buffer");
+    } @catch (NSException* e) {
+      NS_WARNING(nsPrintfCString(256, "Exception raised while drawing to offscreen buffer: \"%s - %s\"", 
+                                 [[e name] UTF8String], [[e reason] UTF8String]).get());
       [image release];
       return;
-    NS_ENDHANDLER
+    }
     [[NSGraphicsContext currentContext] setImageInterpolation:NSImageInterpolationLow];
     HIThemeDrawButton(&drawFrame, &bdi, (CGContext*)[[NSGraphicsContext currentContext] graphicsPort], kHIThemeOrientationInverted, NULL);
     [image unlockFocus];
@@ -520,13 +521,14 @@ nsNativeThemeCocoa::DrawScrollbar(CGContextRef aCGContext, const HIRect& aBoxRec
     ::HIThemeDrawTrack(&tdi, NULL, aCGContext, HITHEME_ORIENTATION);
   else {
     NSImage *buffer = [[NSImage alloc] initWithSize:NSMakeSize(aBoxRect.size.width, aBoxRect.size.height)];
-    NS_DURING
+    @try {
       [buffer lockFocus];
-    NS_HANDLER
-      NS_ASSERTION(0, "Could not lock focus on offscreen buffer");
+    } @catch (NSException* e) {
+      NS_WARNING(nsPrintfCString(256, "Exception raised while drawing to offscreen buffer: \"%s - %s\"", 
+                                 [[e name] UTF8String], [[e reason] UTF8String]).get());
       [buffer release];
       return;
-    NS_ENDHANDLER
+    }
     ::HIThemeDrawTrack(&tdi, NULL, (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort],
                        kHIThemeOrientationInverted);
     [buffer unlockFocus];