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 @implementation DebuggerModel {
  22   NSMutableArray* _stack;
  23 }
  24
  25 - (instancetype)init {
  26   if (self = [super init]) {
  27     _stack = [NSMutableArray new];
  28   }
  29   return self;
  30 }
  31
  32 - (void)dealloc {
  33   [_status release];
  34   [_stack release];
  35   [super dealloc];
  36 }
  37
  38 - (NSUInteger)stackDepth {
  39   return self.stack.count;
  40 }
  41
  42 - (void)onNewConnection {
  43   self.status = nil;
  44   [_stack removeAllObjects];
  45 }
  46
  47 - (void)updateStack:(NSArray<StackFrame*>*)newStack {
  48   // Iterate, in reverse order from the bottom to the top, both stacks to find
  49   // the point of divergence.
  50   NSEnumerator* itNewStack = [newStack reverseObjectEnumerator];
  51   NSEnumerator* itOldStack = [self.stack reverseObjectEnumerator];
  52
  53   StackFrame* frameNew;
  54   StackFrame* frameOld = [itOldStack nextObject];
  55   NSUInteger oldStackOffset = self.stack.count;
  56   while (frameNew = [itNewStack nextObject]) {
  57     if ([frameNew isEqual:frameOld]) {
  58       --oldStackOffset;
  59       frameOld = [itOldStack nextObject];
  60     } else {
  61       break;
  62     }
  63   }
  64
  65   [self willChangeValueForKey:@"stack"];
  66
  67   // Remove any frames from the top of the stack that are not shared with the
  68   // new stack.
  69   [_stack removeObjectsInRange:NSMakeRange(0, oldStackOffset)];
  70
  71   // Continue inserting objects to update the stack with the new frames.
  72   while (frameNew) {
  73     [_stack insertObject:frameNew atIndex:0];
  74     frameNew = [itNewStack nextObject];
  75   }
  76
  77   // Renumber the stack.
  78   for (NSUInteger i = 0; i < self.stack.count; ++i)
  79     self.stack[i].index = i;
  80
  81   [self didChangeValueForKey:@"stack"];
  82 }
  83
  84 @end