Source/DebuggerModel.m

   1 /*
   2  * MacGDBp
   3  * Copyright (c) 2015, Blue Static <https://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 "DebuggerModel.h"
  18
  19 #import "StackFrame.h"
  20
  21 @interface DebuggerModel ()
  22 @property(assign, nonatomic) BOOL connected;
  23 @end
  24
  25 @implementation DebuggerModel {
  26   NSMutableArray* _stack;
  27 }
  28
  29 - (instancetype)init {
  30   if (self = [super init]) {
  31     _stack = [NSMutableArray new];
  32   }
  33   return self;
  34 }
  35
  36 - (void)dealloc {
  37   [_status release];
  38   [_stack release];
  39   [super dealloc];
  40 }
  41
  42 - (NSUInteger)stackDepth {
  43   return self.stack.count;
  44 }
  45
  46 - (void)onNewConnection {
  47   self.status = nil;
  48   self.connected = YES;
  49   [_stack removeAllObjects];
  50 }
  51
  52 - (void)onDisconnect {
  53   self.connected = NO;
  54 }
  55
  56 - (void)updateStack:(NSArray<StackFrame*>*)newStack {
  57   // Iterate, in reverse order from the bottom to the top, both stacks to find
  58   // the point of divergence.
  59   NSEnumerator* itNewStack = [newStack reverseObjectEnumerator];
  60   NSEnumerator* itOldStack = [self.stack reverseObjectEnumerator];
  61
  62   StackFrame* frameNew;
  63   StackFrame* frameOld = [itOldStack nextObject];
  64   NSUInteger oldStackOffset = self.stack.count;
  65   while (frameNew = [itNewStack nextObject]) {
  66     if ([frameNew isEqual:frameOld]) {
  67       --oldStackOffset;
  68       frameOld = [itOldStack nextObject];
  69     } else {
  70       break;
  71     }
  72   }
  73
  74   [self willChangeValueForKey:@"stack"];
  75
  76   // Remove any frames from the top of the stack that are not shared with the
  77   // new stack.
  78   [_stack removeObjectsInRange:NSMakeRange(0, oldStackOffset)];
  79
  80   // Continue inserting objects to update the stack with the new frames.
  81   while (frameNew) {
  82     [_stack insertObject:frameNew atIndex:0];
  83     frameNew = [itNewStack nextObject];
  84   }
  85
  86   // Renumber the stack.
  87   for (NSUInteger i = 0; i < self.stack.count; ++i)
  88     self.stack[i].index = i;
  89
  90   [self didChangeValueForKey:@"stack"];
  91 }
  92
  93 @end