3 * Copyright (c) 2007 - 2011, Blue Static <http://www.bluestatic.org>
5 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU
6 * General Public License as published by the Free Software Foundation; either version 2 of the
7 * License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
10 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along with this program; if not,
14 * write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
17 #import "DebuggerBackEnd.h"
19 #import "AppDelegate.h"
21 #import "NSXMLElementAdditions.h"
23 // GDBpConnection (Private) ////////////////////////////////////////////////////
25 @interface DebuggerBackEnd ()
26 @property (readwrite
, copy
) NSString
* status
;
28 - (void)recordCallback
:(SEL)callback forTransaction
:(NSNumber
*)txn
;
30 - (void)updateStatus
:(NSXMLDocument
*)response
;
31 - (void)debuggerStep
:(NSXMLDocument
*)response
;
32 - (void)rebuildStack
:(NSXMLDocument
*)response
;
33 - (void)getStackFrame
:(NSXMLDocument
*)response
;
34 - (void)setSource
:(NSXMLDocument
*)response
;
35 - (void)contextsReceived
:(NSXMLDocument
*)response
;
36 - (void)variablesReceived
:(NSXMLDocument
*)response
;
37 - (void)propertiesReceived
:(NSXMLDocument
*)response
;
38 - (void)evalScriptReceived
:(NSXMLDocument
*)response
;
42 // GDBpConnection //////////////////////////////////////////////////////////////
44 @implementation DebuggerBackEnd
47 @synthesize attached
= attached_
;
51 * Creates a new DebuggerBackEnd and initializes the socket from the given connection
54 - (id)initWithPort
:(NSUInteger
)aPort
56 if (self = [super init
])
58 stackFrames_
= [[NSMutableDictionary alloc
] init
];
59 callbackContext_
= [NSMutableDictionary
new];
60 callTable_
= [NSMutableDictionary
new];
62 [[BreakpointManager sharedManager
] setConnection
:self];
63 connection_
= [[NetworkConnection alloc
] initWithPort
:aPort
];
64 connection_.delegate
= self;
66 attached_
= [[NSUserDefaults standardUserDefaults
] boolForKey
:@
"DebuggerAttached"];
69 [connection_ connect
];
75 * Deallocates the object
80 [stackFrames_ release
];
82 [callbackContext_ release
];
87 // Getters /////////////////////////////////////////////////////////////////////
91 * Gets the port number
95 return [connection_ port
];
99 * Returns whether or not we have an active connection
103 return [connection_ connected
] && active_
;
107 * Sets the attached state of the debugger. This will open and close the
108 * connection as appropriate.
110 - (void)setAttached
:(BOOL)attached
{
111 if (attached
!= attached_
) {
115 [connection_ connect
];
117 attached_
= attached
;
120 // Commands ////////////////////////////////////////////////////////////////////
121 #pragma mark Commands
124 * Tells the debugger to continue running the script. Returns the current stack frame.
128 NSNumber
* tx
= [connection_ sendCommandWithFormat
:@
"run"];
129 [self recordCallback
:@selector(debuggerStep
:) forTransaction
:tx
];
133 * Tells the debugger to step into the current command.
137 NSNumber
* tx
= [connection_ sendCommandWithFormat
:@
"step_into"];
138 [self recordCallback
:@selector(debuggerStep
:) forTransaction
:tx
];
142 * Tells the debugger to step out of the current context
146 NSNumber
* tx
= [connection_ sendCommandWithFormat
:@
"step_out"];
147 [self recordCallback
:@selector(debuggerStep
:) forTransaction
:tx
];
151 * Tells the debugger to step over the current function
155 NSNumber
* tx
= [connection_ sendCommandWithFormat
:@
"step_over"];
156 [self recordCallback
:@selector(debuggerStep
:) forTransaction
:tx
];
160 * Halts execution of the script.
166 self.status
= @
"Stopped";
170 * Ends the current debugging session.
174 [connection_ sendCommandWithFormat
:@
"detach"];
176 self.status
= @
"Stopped";
180 * Tells the debugger engine to get a specifc property. This also takes in the NSXMLElement
181 * that requested it so that the child can be attached.
183 - (NSInteger
)getChildrenOfProperty
:(VariableNode
*)property atDepth
:(NSInteger
)depth
;
185 NSNumber
* tx
= [connection_ sendCommandWithFormat
:@
"property_get -d %d -n %@", depth
, [property fullName
]];
186 [self recordCallback
:@selector(propertiesReceived
:) forTransaction
:tx
];
187 return [tx intValue
];
190 - (void)loadStackFrame
:(StackFrame
*)frame
195 NSNumber
* routingNumber
= [NSNumber numberWithInt
:frame.routingID
];
196 NSNumber
* transaction
= nil;
198 // Get the source code of the file. Escape % in URL chars.
199 if ([frame.filename length
]) {
200 NSString
* escapedFilename
= [frame.filename stringByReplacingOccurrencesOfString
:@
"%" withString
:@
"%%"];
201 transaction
= [connection_ sendCommandWithFormat
:@
"source -f %@", escapedFilename
];
202 [self recordCallback
:@selector(setSource
:) forTransaction
:transaction
];
203 [callbackContext_ setObject
:routingNumber forKey
:transaction
];
206 // Get the names of all the contexts.
207 transaction
= [connection_ sendCommandWithFormat
:@
"context_names -d %d", frame.index
];
208 [self recordCallback
:@selector(contextsReceived
:) forTransaction
:transaction
];
209 [callbackContext_ setObject
:routingNumber forKey
:transaction
];
211 // This frame will be fully loaded.
215 // Breakpoint Management ///////////////////////////////////////////////////////
216 #pragma mark Breakpoints
219 * Send an add breakpoint command
221 - (void)addBreakpoint
:(Breakpoint
*)bp
223 if (![connection_ connected
])
226 NSString
* file
= [connection_ escapedURIPath
:[bp transformedPath
]];
227 NSNumber
* tx
= [connection_ sendCommandWithFormat
:@
"breakpoint_set -t line -f %@ -n %i", file
, [bp line
]];
228 [self recordCallback
:@selector(breakpointReceived
:) forTransaction
:tx
];
229 [callbackContext_ setObject
:bp forKey
:tx
];
233 * Removes a breakpoint
235 - (void)removeBreakpoint
:(Breakpoint
*)bp
237 if (![connection_ connected
])
240 [connection_ sendCommandWithFormat
:@
"breakpoint_remove -d %i", [bp debuggerId
]];
244 * Sends a string to be evaluated by the engine.
246 - (void)evalScript
:(NSString
*)str
248 if (![connection_ connected
])
251 char* encodedString
= malloc(modp_b64_encode_len([str length
]));
252 modp_b64_encode(encodedString
, [str UTF8String
], [str length
]);
253 NSNumber
* tx
= [connection_ sendCustomCommandWithFormat
:@
"eval -i {txn} -- %s", encodedString
];
256 [self recordCallback
:@selector(evalScriptReceived
:) forTransaction
:tx
];
259 // Specific Response Handlers //////////////////////////////////////////////////
260 #pragma mark Response Handlers
262 - (void)errorEncountered
:(NSString
*)error
264 [delegate errorEncountered
:error
];
268 * Initial packet received. We've started a brand-new connection to the engine.
270 - (void)handleInitialResponse
:(NSXMLDocument
*)response
272 if (!self.attached
) {
273 [connection_ sendCommandWithFormat
:@
"detach"];
279 // Register any breakpoints that exist offline.
280 for (Breakpoint
* bp
in [[BreakpointManager sharedManager
] breakpoints
])
281 [self addBreakpoint
:bp
];
283 // Load the debugger to make it look active.
284 [delegate debuggerConnected
];
286 // TODO: update the status.
290 * Called when the connection is finally closed. This will reopen the listening
291 * socket if the debugger remains attached.
293 - (void)connectionDidClose
:(NetworkConnection
*)connection
295 if ([delegate respondsToSelector
:@selector(debuggerDisconnected
)])
296 [delegate debuggerDisconnected
];
299 [connection_ connect
];
302 - (void)handleResponse
:(NSXMLDocument
*)response
304 NSInteger transactionID
= [connection_ transactionIDFromResponse
:response
];
305 NSNumber
* key
= [NSNumber numberWithInt
:transactionID
];
306 NSString
* callbackStr
= [callTable_ objectForKey
:key
];
309 SEL callback
= NSSelectorFromString(callbackStr
);
310 [self performSelector
:callback withObject
:response
];
312 [callTable_ removeObjectForKey
:key
];
316 * Receiver for status updates. This just freshens up the UI.
318 - (void)updateStatus
:(NSXMLDocument
*)response
320 self.status
= [[[[response rootElement
] attributeForName
:@
"status"] stringValue
] capitalizedString
];
322 if (!status ||
[status isEqualToString
:@
"Stopped"]) {
323 [delegate debuggerDisconnected
];
325 } else if ([status isEqualToString
:@
"Stopping"]) {
326 [connection_ sendCommandWithFormat
:@
"stop"];
332 * Step in/out/over and run all take this path. We first get the status of the
333 * debugger and then request fresh stack information.
335 - (void)debuggerStep
:(NSXMLDocument
*)response
337 [self updateStatus
:response
];
338 if (![self isConnected
])
341 // If this is the run command, tell the delegate that a bunch of updates
342 // are coming. Also remove all existing stack routes and request a new stack.
343 if ([delegate respondsToSelector
:@selector(clobberStack
)])
344 [delegate clobberStack
];
345 [stackFrames_ removeAllObjects
];
346 NSNumber
* tx
= [connection_ sendCommandWithFormat
:@
"stack_depth"];
347 [self recordCallback
:@selector(rebuildStack
:) forTransaction
:tx
];
348 stackFirstTransactionID_
= [tx intValue
];
352 * We ask for the stack_depth and now we clobber the stack and start rebuilding
355 - (void)rebuildStack
:(NSXMLDocument
*)response
357 NSInteger depth
= [[[[response rootElement
] attributeForName
:@
"depth"] stringValue
] intValue
];
359 if (stackFirstTransactionID_
== [connection_ transactionIDFromResponse
:response
])
362 // We now need to alloc a bunch of stack frames and get the basic information
364 for (NSInteger i
= 0; i
< depth
; i
++)
366 // Use the transaction ID to create a routing path.
367 NSNumber
* routingID
= [connection_ sendCommandWithFormat
:@
"stack_get -d %d", i
];
368 [self recordCallback
:@selector(getStackFrame
:) forTransaction
:routingID
];
369 [stackFrames_ setObject
:[[StackFrame
new] autorelease
] forKey
:routingID
];
374 * The initial rebuild of the stack frame. We now have enough to initialize
375 * a StackFrame object.
377 - (void)getStackFrame
:(NSXMLDocument
*)response
379 // Get the routing information.
380 NSInteger routingID
= [connection_ transactionIDFromResponse
:response
];
381 if (routingID
< stackFirstTransactionID_
)
383 NSNumber
* routingNumber
= [NSNumber numberWithInt
:routingID
];
385 // Make sure we initialized this frame in our last |-rebuildStack:|.
386 StackFrame
* frame
= [stackFrames_ objectForKey
:routingNumber
];
390 NSXMLElement
* xmlframe
= [[[response rootElement
] children
] objectAtIndex
:0];
392 // Initialize the stack frame.
393 frame.index
= [[[xmlframe attributeForName
:@
"level"] stringValue
] intValue
];
394 frame.filename
= [[xmlframe attributeForName
:@
"filename"] stringValue
];
395 frame.lineNumber
= [[[xmlframe attributeForName
:@
"lineno"] stringValue
] intValue
];
396 frame.function
= [[xmlframe attributeForName
:@
"where"] stringValue
];
397 frame.routingID
= routingID
;
399 // Only get the complete frame for the first level. The other frames will get
400 // information loaded lazily when the user clicks on one.
401 if (frame.index
== 0) {
402 [self loadStackFrame
:frame
];
405 if ([delegate respondsToSelector
:@selector(newStackFrame
:)])
406 [delegate newStackFrame
:frame
];
410 * Callback for setting the source of a file while rebuilding a specific stack
413 - (void)setSource
:(NSXMLDocument
*)response
415 NSNumber
* transaction
= [NSNumber numberWithInt
:[connection_ transactionIDFromResponse
:response
]];
416 if ([transaction intValue
] < stackFirstTransactionID_
)
418 NSNumber
* routingNumber
= [callbackContext_ objectForKey
:transaction
];
422 [callbackContext_ removeObjectForKey
:transaction
];
423 StackFrame
* frame
= [stackFrames_ objectForKey
:routingNumber
];
427 frame.source
= [[response rootElement
] base64DecodedValue
];
429 if ([delegate respondsToSelector
:@selector(sourceUpdated
:)])
430 [delegate sourceUpdated
:frame
];
434 * Enumerates all the contexts of a given stack frame. We then in turn get the
435 * contents of each one of these contexts.
437 - (void)contextsReceived
:(NSXMLDocument
*)response
439 // Get the stack frame's routing ID and use it again.
440 NSNumber
* receivedTransaction
= [NSNumber numberWithInt
:[connection_ transactionIDFromResponse
:response
]];
441 if ([receivedTransaction intValue
] < stackFirstTransactionID_
)
443 NSNumber
* routingID
= [callbackContext_ objectForKey
:receivedTransaction
];
447 // Get the stack frame by the |routingID|.
448 StackFrame
* frame
= [stackFrames_ objectForKey
:routingID
];
450 NSXMLElement
* contextNames
= [response rootElement
];
451 for (NSXMLElement
* context
in [contextNames children
])
453 NSInteger cid
= [[[context attributeForName
:@
"id"] stringValue
] intValue
];
455 // Fetch each context's variables.
456 NSNumber
* tx
= [connection_ sendCommandWithFormat
:@
"context_get -d %d -c %d", frame.index
, cid
];
457 [self recordCallback
:@selector(variablesReceived
:) forTransaction
:tx
];
458 [callbackContext_ setObject
:routingID forKey
:tx
];
463 * Receives the variables from the context and attaches them to the stack frame.
465 - (void)variablesReceived
:(NSXMLDocument
*)response
467 // Get the stack frame's routing ID and use it again.
468 NSInteger transaction
= [connection_ transactionIDFromResponse
:response
];
469 if (transaction
< stackFirstTransactionID_
)
471 NSNumber
* receivedTransaction
= [NSNumber numberWithInt
:transaction
];
472 NSNumber
* routingID
= [callbackContext_ objectForKey
:receivedTransaction
];
476 // Get the stack frame by the |routingID|.
477 StackFrame
* frame
= [stackFrames_ objectForKey
:routingID
];
479 NSMutableArray
* variables
= [NSMutableArray array
];
481 // Merge the frame's existing variables.
483 [variables addObjectsFromArray
:frame.variables
];
485 // Add these new variables.
486 NSArray
* addVariables
= [[response rootElement
] children
];
488 for (NSXMLElement
* elm
in addVariables
) {
489 VariableNode
* node
= [[VariableNode alloc
] initWithXMLNode
:elm
];
490 [variables addObject
:[node autorelease
]];
494 frame.variables
= variables
;
498 * Callback from a |-getProperty:| request.
500 - (void)propertiesReceived
:(NSXMLDocument
*)response
502 NSInteger transaction
= [connection_ transactionIDFromResponse
:response
];
506 <property> <!-- this is the one we requested -->
507 <property ... /> <!-- these are what we want -->
512 // Detach all the children so we can insert them into another document.
513 NSXMLElement
* parent
= (NSXMLElement
*)[[response rootElement
] childAtIndex
:0];
514 NSArray
* children
= [parent children
];
515 [parent setChildren
:nil];
517 [delegate receivedProperties
:children forTransaction
:transaction
];
521 * Callback from a |-evalScript:| request.
523 - (void)evalScriptReceived
:(NSXMLDocument
*)response
525 NSXMLElement
* parent
= (NSXMLElement
*)[[response rootElement
] childAtIndex
:0];
526 NSString
* value
= [parent base64DecodedValue
];
527 [delegate scriptWasEvaluatedWithResult
:value
];
531 * Callback for setting a breakpoint.
533 - (void)breakpointReceived
:(NSXMLDocument
*)response
535 NSNumber
* transaction
= [NSNumber numberWithInt
:[connection_ transactionIDFromResponse
:response
]];
536 Breakpoint
* bp
= [callbackContext_ objectForKey
:transaction
];
540 [callbackContext_ removeObjectForKey
:callbackContext_
];
541 [bp setDebuggerId
:[[[[response rootElement
] attributeForName
:@
"id"] stringValue
] intValue
]];
544 // Private /////////////////////////////////////////////////////////////////////
546 - (void)recordCallback
:(SEL)callback forTransaction
:(NSNumber
*)txn
548 [callTable_ setObject
:NSStringFromSelector(callback
) forKey
:txn
];