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 "BreakpointManager.h"
  20 #import "StackFrame.h"
  21
  22 @interface DebuggerModel ()
  23 @property(assign, nonatomic) BOOL connected;
  24 @end
  25
  26 @implementation DebuggerModel {
  27   NSMutableArray* _stack;
  28 }
  29
  30 - (instancetype)init {
  31   if (self = [super init]) {
  32     _breakpointManager = [[BreakpointManager alloc] init];
  33     _stack = [NSMutableArray new];
  34
  35     [self onDisconnect];
  36   }
  37   return self;
  38 }
  39
  40 - (void)dealloc {
  41   [_breakpointManager release];
  42   [_status release];
  43   [_stack release];
  44   [super dealloc];
  45 }
  46
  47 - (NSUInteger)stackDepth {
  48   return self.stack.count;
  49 }
  50
  51 - (void)onNewConnection {
  52   self.status = nil;
  53   self.connected = YES;
  54   [_stack removeAllObjects];
  55 }
  56
  57 - (void)onDisconnect {
  58   self.connected = NO;
  59   self.status = @"Disconnected";
  60 }
  61
  62 - (void)updateStack:(NSArray<StackFrame*>*)newStack {
  63   // Iterate, in reverse order from the bottom to the top, both stacks to find
  64   // the point of divergence.
  65   NSEnumerator* itNewStack = [newStack reverseObjectEnumerator];
  66   NSEnumerator* itOldStack = [self.stack reverseObjectEnumerator];
  67
  68   StackFrame* frameNew;
  69   StackFrame* frameOld = [itOldStack nextObject];
  70   NSUInteger oldStackOffset = self.stack.count;
  71   while (frameNew = [itNewStack nextObject]) {
  72     if ([frameNew isEqual:frameOld]) {
  73       --oldStackOffset;
  74       frameOld = [itOldStack nextObject];
  75     } else {
  76       break;
  77     }
  78   }
  79
  80   [self willChangeValueForKey:@"stack"];
  81
  82   // Remove any frames from the top of the stack that are not shared with the
  83   // new stack.
  84   [_stack removeObjectsInRange:NSMakeRange(0, oldStackOffset)];
  85
  86   // Continue inserting objects to update the stack with the new frames.
  87   while (frameNew) {
  88     [_stack insertObject:frameNew atIndex:0];
  89     frameNew = [itNewStack nextObject];
  90   }
  91
  92   // Renumber the stack.
  93   for (NSUInteger i = 0; i < self.stack.count; ++i)
  94     self.stack[i].index = i;
  95
  96   [self didChangeValueForKey:@"stack"];
  97 }
  98
  99 @end