Source/GDBpConnection.m

   1 /*
   2  * MacGDBp
   3  * Copyright (c) 2007 - 2009, Blue Static <http://www.bluestatic.org>
   4  *
   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.
   8  *
   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.
  12  *
  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
  15  */
  16
  17 #import "GDBpConnection.h"
  18 #import "AppDelegate.h"
  19
  20 NSString *kErrorOccurredNotif = @"GDBpConnection_ErrorOccured_Notification";
  21
  22 @interface GDBpConnection()
  23 @property(readwrite, copy) NSString *status;
  24
  25 - (NSString *)createCommand:(NSString *)cmd;
  26 - (NSXMLDocument *)processData:(NSString *)data;
  27 - (StackFrame *)createStackFrame;
  28 - (void)updateStatus;
  29 @end
  30
  31 @implementation GDBpConnection
  32
  33 @synthesize socket, status;
  34
  35 /**
  36  * Creates a new DebuggerConnection and initializes the socket from the given connection
  37  * paramters.
  38  */
  39 - (id)initWithPort:(int)aPort session:(NSString *)aSession;
  40 {
  41         if (self = [super init])
  42         {
  43                 port = aPort;
  44                 session = [aSession retain];
  45                 connected = NO;
  46
  47                 // now that we have our host information, open the socket
  48                 socket = [[SocketWrapper alloc] initWithConnection:self];
  49                 [socket setDelegate:self];
  50                 [socket connect];
  51
  52                 self.status = @"Connecting";
  53
  54                 [[BreakpointManager sharedManager] setConnection:self];
  55         }
  56         return self;
  57 }
  58
  59 /**
  60  * Deallocates the object
  61  */
  62 - (void)dealloc
  63 {
  64         [socket release];
  65         [session release];
  66         [super dealloc];
  67 }
  68
  69 /**
  70  * Gets the port number
  71  */
  72 - (int)port
  73 {
  74         return port;
  75 }
  76
  77 /**
  78  * Gets the session name
  79  */
  80 - (NSString *)session
  81 {
  82         return session;
  83 }
  84
  85 /**
  86  * Returns the name of the remote host
  87  */
  88 - (NSString *)remoteHost
  89 {
  90         if (!connected)
  91         {
  92                 return @"(DISCONNECTED)";
  93         }
  94         return [socket remoteHost];
  95 }
  96
  97 /**
  98  * Returns whether or not we have an active connection
  99  */
 100 - (BOOL)isConnected
 101 {
 102         return connected;
 103 }
 104
 105 /**
 106  * Called by SocketWrapper after the connection is successful. This immediately calls
 107  * -[SocketWrapper receive] to clear the way for communication, though the information
 108  * could be useful server information that we don't use right now.
 109  */
 110 - (void)socketDidAccept:(id)obj
 111 {
 112         connected = YES;
 113         [socket receive];
 114         [self updateStatus];
 115
 116         // register any breakpoints that exist offline
 117         for (Breakpoint *bp in [[BreakpointManager sharedManager] breakpoints])
 118         {
 119                 [self addBreakpoint:bp];
 120         }
 121
 122         [[[NSApp delegate] debugger] startDebugger]; // this will just load the debugger to make it look active
 123 }
 124
 125 /**
 126  * Receives errors from the SocketWrapper and updates the display
 127  */
 128 - (void)errorEncountered:(NSString *)error
 129 {
 130         [[NSNotificationCenter defaultCenter]
 131                 postNotificationName:kErrorOccurredNotif
 132                 object:self
 133                 userInfo:[NSDictionary
 134                         dictionaryWithObject:error
 135                         forKey:@"NSString"
 136                 ]
 137         ];
 138 }
 139
 140 /**
 141  * Reestablishes communication with the remote debugger so that a new connection doesn't have to be
 142  * created every time you want to debug a page
 143  */
 144 - (void)reconnect
 145 {
 146         [socket close];
 147         self.status = @"Connecting";
 148         [socket connect];
 149 }
 150
 151 /**
 152  * Tells the debugger to continue running the script
 153  */
 154 - (StackFrame *)run
 155 {
 156         [socket send:[self createCommand:@"run"]];
 157         [socket receive];
 158
 159         [self updateStatus];
 160
 161         if (!connected)
 162                 return nil;
 163
 164         return [self createStackFrame];
 165 }
 166
 167 /**
 168  * Tells the debugger to step into the current command.
 169  */
 170 - (StackFrame *)stepIn
 171 {
 172         [socket send:[self createCommand:@"step_into"]];
 173         [socket receive];
 174
 175         [self updateStatus];
 176
 177         if (!connected)
 178                 return nil;
 179
 180         return [self createStackFrame];
 181 }
 182
 183 /**
 184  * Tells the debugger to step out of the current context
 185  */
 186 - (StackFrame *)stepOut
 187 {
 188         [socket send:[self createCommand:@"step_out"]];
 189         [socket receive];
 190
 191         [self updateStatus];
 192
 193         if (!connected)
 194                 return nil;
 195
 196         return [self createStackFrame];
 197 }
 198
 199 /**
 200  * Tells the debugger to step over the current function
 201  */
 202 - (StackFrame *)stepOver
 203 {
 204         [socket send:[self createCommand:@"step_over"]];
 205         [socket receive];
 206
 207         [self updateStatus];
 208
 209         if (!connected)
 210                 return nil;
 211
 212         return [self createStackFrame];
 213 }
 214
 215 /**
 216  * Tells the debugger engine to get a specifc property. This also takes in the NSXMLElement
 217  * that requested it so that the child can be attached.
 218  */
 219 - (NSArray *)getProperty:(NSString *)property
 220 {
 221         [socket send:[self createCommand:[NSString stringWithFormat:@"property_get -n \"%@\"", property]]];
 222
 223         NSXMLDocument *doc = [self processData:[socket receive]];
 224
 225         /*
 226          <response>
 227                 <property> <!-- this is the one we requested -->
 228                         <property ... /> <!-- these are what we want -->
 229                 </property>
 230          </repsonse>
 231          */
 232
 233         // we now have to detach all the children so we can insert them into another document
 234         NSXMLElement *parent = (NSXMLElement *)[[doc rootElement] childAtIndex:0];
 235         NSArray *children = [parent children];
 236         [parent setChildren:nil];
 237         return children;
 238 }
 239
 240 #pragma mark Breakpoints
 241
 242 /**
 243  * Send an add breakpoint command
 244  */
 245 - (void)addBreakpoint:(Breakpoint *)bp
 246 {
 247         if (!connected)
 248         {
 249                 return;
 250         }
 251
 252         NSString *cmd = [self createCommand:[NSString stringWithFormat:@"breakpoint_set -t line -f %@ -n %i", [bp transformedPath], [bp line]]];
 253         [socket send:cmd];
 254         NSXMLDocument *info = [self processData:[socket receive]];
 255         [bp setDebuggerId:[[[[info rootElement] attributeForName:@"id"] stringValue] intValue]];
 256 }
 257
 258 /**
 259  * Removes a breakpoint
 260  */
 261 - (void)removeBreakpoint:(Breakpoint *)bp
 262 {
 263         if (!connected)
 264         {
 265                 return;
 266         }
 267
 268         [socket send:[self createCommand:[NSString stringWithFormat:@"breakpoint_remove -d %i", [bp debuggerId]]]];
 269         [socket receive];
 270 }
 271
 272 #pragma mark Private
 273
 274 /**
 275  * Helper method to create a string command with the -i <session> automatically tacked on
 276  */
 277 - (NSString *)createCommand:(NSString *)cmd
 278 {
 279         return [NSString stringWithFormat:@"%@ -i %@", cmd, session];
 280 }
 281
 282 /**
 283  * Helper function to parse the NSData into an NSXMLDocument
 284  */
 285 - (NSXMLDocument *)processData:(NSString *)data
 286 {
 287         if (data == nil)
 288                 return nil;
 289
 290         NSError *parseError = nil;
 291         NSXMLDocument *doc = [[NSXMLDocument alloc] initWithXMLString:data options:0 error:&parseError];
 292         if (parseError)
 293         {
 294                 NSLog(@"Could not parse XML? --- %@", parseError);
 295                 NSLog(@"Error UserInfo: %@", [parseError userInfo]);
 296                 NSLog(@"This is the XML Document: %@", data);
 297                 return nil;
 298         }
 299
 300         // check and see if there's an error
 301         NSArray *error = [[doc rootElement] elementsForName:@"error"];
 302         if ([error count] > 0)
 303         {
 304                 NSLog(@"Xdebug error: %@", error);
 305                 [self errorEncountered:[[[[error objectAtIndex:0] children] objectAtIndex:0] stringValue]];
 306                 return nil;
 307         }
 308
 309         return [doc autorelease];
 310 }
 311
 312 /**
 313  * Creates a StackFrame based on the current position in the debugger
 314  */
 315 - (StackFrame *)createStackFrame
 316 {
 317         // get the stack frame
 318         [socket send:[self createCommand:@"stack_get -d 0"]];
 319         NSXMLDocument *doc = [self processData:[socket receive]];
 320         if (doc == nil)
 321                 return nil;
 322
 323         NSXMLElement *xmlframe = [[[doc rootElement] children] objectAtIndex:0];
 324
 325         // get the names of all the contexts
 326         [socket send:[self createCommand:@"context_names -d 0"]];
 327         NSXMLElement *contextNames = [[self processData:[socket receive]] rootElement];
 328         NSMutableArray *variables = [NSMutableArray array];
 329         for (NSXMLElement *context in [contextNames children])
 330         {
 331                 NSString *name = [[context attributeForName:@"name"] stringValue];
 332                 int cid = [[[context attributeForName:@"id"] stringValue] intValue];
 333
 334                 // fetch the contexts
 335                 [socket send:[self createCommand:[NSString stringWithFormat:@"context_get -d 0 -c %d", cid]]];
 336                 NSArray *addVars = [[[self processData:[socket receive]] rootElement] children];
 337                 if (addVars != nil && name != nil)
 338                         [variables addObjectsFromArray:addVars];
 339         }
 340
 341         // get the source
 342         NSString *filename = [[xmlframe attributeForName:@"filename"] stringValue];
 343         [socket send:[self createCommand:[NSString stringWithFormat:@"source -f %@", filename]]];
 344         NSString *source = [[[self processData:[socket receive]] rootElement] value]; // decode base64
 345
 346         // create stack frame
 347         StackFrame *frame = [[StackFrame alloc]
 348                 initWithIndex:0
 349                 withFilename:filename
 350                 withSource:source
 351                 atLine:[[[xmlframe attributeForName:@"lineno"] stringValue] intValue]
 352                 inFunction:[[xmlframe attributeForName:@"where"] stringValue]
 353                 withVariables:variables
 354         ];
 355
 356         return [frame autorelease];
 357 }
 358
 359 /**
 360  * Fetches the value of and sets the status instance variable
 361  */
 362 - (void)updateStatus
 363 {
 364         [socket send:[self createCommand:@"status"]];
 365         NSXMLDocument *doc = [self processData:[socket receive]];
 366         self.status = [[[[doc rootElement] attributeForName:@"status"] stringValue] capitalizedString];
 367
 368         if (status == nil || [status isEqualToString:@"Stopped"] || [status isEqualToString:@"Stopping"])
 369         {
 370                 connected = NO;
 371                 [socket close];
 372                 self.status = @"Stopped";
 373         }
 374 }
 375
 376 @end