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 - (NSUInteger)stackDepth {
  41   return self.stack.count;
  42 }
  43
  44 - (void)onListeningOnPort:(uint16_t)port {
  45   self.status = [NSString stringWithFormat:@"Listening on Port %d", port];
  46 }
  47
  48 - (void)onNewConnection {
  49   self.status = nil;
  50   self.connected = YES;
  51   [_stack removeAllObjects];
  52 }
  53
  54 - (void)onDisconnect {
  55   self.connected = NO;
  56   self.status = @"Disconnected";
  57 }
  58
  59 - (void)updateStack:(NSArray<StackFrame*>*)newStack {
  60   // Iterate, in reverse order from the bottom to the top, both stacks to find
  61   // the point of divergence.
  62   NSEnumerator* itNewStack = [newStack reverseObjectEnumerator];
  63   NSEnumerator* itOldStack = [self.stack reverseObjectEnumerator];
  64
  65   StackFrame* frameNew;
  66   StackFrame* frameOld = [itOldStack nextObject];
  67   NSUInteger oldStackOffset = self.stack.count;
  68   while (frameNew = [itNewStack nextObject]) {
  69     if ([frameNew isEqual:frameOld]) {
  70       --oldStackOffset;
  71       frameOld = [itOldStack nextObject];
  72     } else {
  73       break;
  74     }
  75   }
  76
  77   [self willChangeValueForKey:@"stack"];
  78
  79   // Remove any frames from the top of the stack that are not shared with the
  80   // new stack.
  81   [_stack removeObjectsInRange:NSMakeRange(0, oldStackOffset)];
  82
  83   // Continue inserting objects to update the stack with the new frames.
  84   while (frameNew) {
  85     [_stack insertObject:frameNew atIndex:0];
  86     frameNew = [itNewStack nextObject];
  87   }
  88
  89   // Renumber the stack.
  90   for (NSUInteger i = 0; i < self.stack.count; ++i)
  91     self.stack[i].index = i;
  92
  93   [self didChangeValueForKey:@"stack"];
  94 }
  95
  96 @end