From 2b3e345aeabc5138b7f8a11db12dad94554f8f7d Mon Sep 17 00:00:00 2001
From: Robert Sesek <rsesek@bluestatic.org>
Date: Sat, 19 Jun 2010 12:26:58 -0400
Subject: [PATCH] Lazily load the complete stack frame for anything but the
 current one.

---
 Source/DebuggerController.m |  7 ++++++-
 Source/DebuggerProcessor.h  |  4 ++++
 Source/DebuggerProcessor.m  | 34 ++++++++++++++++++++++++----------
 Source/StackFrame.h         |  6 ++++++
 Source/StackFrame.m         |  1 +
 5 files changed, 41 insertions(+), 11 deletions(-)

diff --git a/Source/DebuggerController.m b/Source/DebuggerController.m
index 365401e..3fa729d 100644
--- a/Source/DebuggerController.m
+++ b/Source/DebuggerController.m
@@ -252,7 +252,12 @@
 	if ([selection count] > 1)
 		NSLog(@"INVALID SELECTION");
 	StackFrame* frame = [selection objectAtIndex:0];
-	
+
+	if (!frame.loaded) {
+		[connection loadStackFrame:frame];
+		return;
+	}
+
 	// Get the filename.
 	NSString* filename = [[NSURL URLWithString:frame.filename] path];
 	if ([filename isEqualToString:@""])
diff --git a/Source/DebuggerProcessor.h b/Source/DebuggerProcessor.h
index f567af3..bc0acf5 100644
--- a/Source/DebuggerProcessor.h
+++ b/Source/DebuggerProcessor.h
@@ -82,6 +82,9 @@
 // which used in the delegate callback.
 - (NSInteger)getProperty:(NSString*)property;
 
+// Takes a partially loaded stack frame and fetches the rest of the information.
+- (void)loadStackFrame:(StackFrame*)frame;
+
 @end
 
 // Delegate ////////////////////////////////////////////////////////////////////
@@ -105,6 +108,7 @@
 - (void)newStackFrame:(StackFrame*)frame;
 
 // Tells the debugger that new source is available for the given frame.
+// TODO: rename to |-frameUpdated:|.
 - (void)sourceUpdated:(StackFrame*)frame;
 
 // Callback from |-getProperty:|.
diff --git a/Source/DebuggerProcessor.m b/Source/DebuggerProcessor.m
index d51b6e6..42af132 100644
--- a/Source/DebuggerProcessor.m
+++ b/Source/DebuggerProcessor.m
@@ -167,6 +167,28 @@
 	[self recordCallback:@selector(propertiesReceived:) forTransaction:tx];
 }
 
+- (void)loadStackFrame:(StackFrame*)frame
+{
+	if (frame.loaded)
+		return;
+
+	NSNumber* routingNumber = [NSNumber numberWithInt:frame.routingID];
+
+	// Get the source code of the file. Escape % in URL chars.
+	NSString* escapedFilename = [frame.filename stringByReplacingOccurrencesOfString:@"%" withString:@"%%"];
+	NSNumber* transaction = [connection_ sendCommandWithFormat:@"source -f %@", escapedFilename];
+	[self recordCallback:@selector(setSource:) forTransaction:transaction];
+	[callbackContext_ setObject:routingNumber forKey:transaction];
+	
+	// Get the names of all the contexts.
+	transaction = [connection_ sendCommandWithFormat:@"context_names -d %d", frame.index];
+	[self recordCallback:@selector(contextsReceived:) forTransaction:transaction];
+	[callbackContext_ setObject:routingNumber forKey:transaction];
+	
+	// This frame will be fully loaded.
+	frame.loaded = YES;
+}
+
 // Breakpoint Management ///////////////////////////////////////////////////////
 #pragma mark Breakpoints
 
@@ -314,20 +336,12 @@
 				  atLine:[[[xmlframe attributeForName:@"lineno"] stringValue] intValue]
 			  inFunction:[[xmlframe attributeForName:@"where"] stringValue]
 		   withVariables:nil];
+	frame.routingID = routingID;
 
 	// Only get the complete frame for the first level. The other frames will get
 	// information loaded lazily when the user clicks on one.
 	if (frame.index == 0) {
-		// Get the source code of the file. Escape % in URL chars.
-		NSString* escapedFilename = [frame.filename stringByReplacingOccurrencesOfString:@"%" withString:@"%%"];
-		NSNumber* transaction = [connection_ sendCommandWithFormat:@"source -f %@", escapedFilename];
-		[self recordCallback:@selector(setSource:) forTransaction:transaction];
-		[callbackContext_ setObject:routingNumber forKey:transaction];
-		
-		// Get the names of all the contexts.
-		transaction = [connection_ sendCommandWithFormat:@"context_names -d %d", frame.index];
-		[self recordCallback:@selector(contextsReceived:) forTransaction:transaction];
-		[callbackContext_ setObject:routingNumber forKey:transaction];
+		[self loadStackFrame:frame];
 	}
 	
 	if ([delegate respondsToSelector:@selector(newStackFrame:)])
diff --git a/Source/StackFrame.h b/Source/StackFrame.h
index ac31ad0..591d8e0 100644
--- a/Source/StackFrame.h
+++ b/Source/StackFrame.h
@@ -18,6 +18,11 @@
 
 @interface StackFrame : NSObject
 {
+	/**
+	 * Whether or not the stack frame has been fully loaded.
+	 */
+	BOOL loaded_;
+
 	/**
 	 * The routing ID used to receive response information from the engine.
 	 */
@@ -54,6 +59,7 @@
 	NSArray* variables;
 }
 
+@property BOOL loaded;
 @property NSUInteger routingID;
 @property (readwrite) int index;
 @property (readonly, copy) NSString* filename;
diff --git a/Source/StackFrame.m b/Source/StackFrame.m
index f00dab3..bdb9193 100644
--- a/Source/StackFrame.m
+++ b/Source/StackFrame.m
@@ -26,6 +26,7 @@
 
 @implementation StackFrame
 
+@synthesize loaded = loaded_;
 @synthesize routingID = routingID_;
 @synthesize index, filename, source, lineNumber, function, variables;
 
-- 
2.43.5