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1
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1 /* Ddbg - Win32 Debugger for the D programming language
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2 * Copyright (c) 2007 Jascha Wetzel
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3 * All rights reserved. See LICENSE.TXT for details.
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4 */
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5 module expression.evaluationcontext;
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6
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7 import container;
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8 import codeview.decl;
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9 import codeview.codeview;
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10 import minidump;
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11 import dbgprocess;
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12 import dbgthread;
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13 import callstack;
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14 import util;
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15 import expression.datahandler;
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16
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17 import std.string;
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18
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19 import win32.winnt;
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20
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21 class EvaluationException : Exception
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22 {
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23 this(string m) { super(m); }
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24 }
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25
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26 /**************************************************************************************************
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27
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28 **************************************************************************************************/
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29 class SymbolData
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30 {
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31 string type;
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32 bool defered_load;
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33
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34 union
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35 {
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36 ubyte[] data;
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37 struct {
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38 size_t len,
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39 ptr;
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40 }
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41 }
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42
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43 /**********************************************************************************************
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44
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45 **********************************************************************************************/
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46 ubyte[] getData(EvaluationContext ctx)
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47 {
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48 if ( defered_load )
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49 {
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50 debug(eval) DbgIO.println("defered load: ptr=%x len=%d", ptr, len);
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51 defered_load = false;
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52 data = ctx.readMemory(ptr, len);
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53 }
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54 return data;
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55 }
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56
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57 /**********************************************************************************************
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58
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59 **********************************************************************************************/
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60 bool loadElementSlice(size_t start, size_t end, CodeView cv)
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61 {
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62 assert(end>=start);
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63 size_t size = cv.sizeofMangled(type);
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64 start *= size;
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65 end *= size;
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66 if ( defered_load )
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67 {
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68 if ( end > len )
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69 return false;
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70 ptr += start;
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71 len = end-start;
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72 }
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73 else
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74 {
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75 if ( end > data.length )
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76 return false;
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77 data = data[start..end];
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78 }
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79 return true;
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80 }
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81
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82 /**********************************************************************************************
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83
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84 **********************************************************************************************/
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85 bool loadByteSlice(size_t start, size_t end)
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86 {
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87 assert(end>=start);
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88 if ( defered_load )
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89 {
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90 if ( end > len )
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91 return false;
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92 ptr += start;
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93 len = end-start;
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94 }
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95 else
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96 {
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97 if ( end > data.length )
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98 return false;
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99 data = data[start..end];
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100 }
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101 return true;
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102 }
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103 }
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104
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105 /**************************************************************************************************
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106
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107 **************************************************************************************************/
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108 class EvaluationContext
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109 {
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110 CodeView codeView;
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111 MiniDump miniDump;
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112 DbgProcess process;
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113 DbgThread thread;
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114
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115 uint frameLevel;
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116 CallStack stack;
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117 ScopeSymbol scopeSym;
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118
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119 NamedSymbol[] scopeSymbols;
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120
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121 /**********************************************************************************************
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122
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123 **********************************************************************************************/
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124 this(CodeView _cv,
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125 uint _current_address,
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126 MiniDump _miniDump,
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127 DbgProcess _process,
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128 DbgThread _thread,
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129 CallStack _stack,
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130 uint _frame_level=0
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131 )
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132 {
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133 miniDump = _miniDump;
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134 thread = _thread;
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135 codeView = _cv;
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136 process = _process;
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137 stack = _stack;
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138 frameLevel = _frame_level;
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139
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140 uint segment;
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141 scopeSym = codeView.findProcedureSymbol(_current_address);
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142 for ( ; scopeSym !is null; scopeSym = scopeSym.parent_scope )
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143 {
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144 scopeSymbols ~= scopeSym.symbols.named_symbols;
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145 ProcedureSymbol psym = cast(ProcedureSymbol)scopeSym;
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146 if ( psym !is null )
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147 scopeSymbols ~= psym.arguments.named_symbols;
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148 }
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149 }
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150
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151 bool getContext(out CONTEXT ctx, uint context_flags)
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152 {
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153 if ( process !is null )
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154 return thread.getContext(ctx, context_flags);
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155 else if ( miniDump !is null ) {
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156 CONTEXT* ptr = miniDump.getContext;
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157 if ( ptr !is null ) {
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158 ctx = *ptr;
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159 return true;
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160 }
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161 }
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162 return false;
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163 }
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164
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165 /**********************************************************************************************
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166
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167 **********************************************************************************************/
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168 NamedSymbol findSymbol(string name, inout NamedSymbol[] symbols)
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169 {
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170 if ( symbols is null )
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171 {
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172 StringWrap sw = new StringWrap(name);
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173 AVLNode!(NamedSymbol) res;
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174 if ( codeView.globalNamedSymbols.find(sw, res) )
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175 {
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176 NamedSymbol ns = res.value;
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177 ScopeSymbol scopesym = cast(ScopeSymbol)ns;
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178 if ( scopesym is null )
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179 return ns;
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180 symbols = scopesym.symbols.named_symbols;
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181 return null;
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182 }
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183 foreach ( ns; scopeSymbols )
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184 {
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185 if ( name == ns.name_notype )
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186 {
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187 debug(findSymbol) DbgIO.println("%s == %s", name, ns.name_notype);
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188 ScopeSymbol scopesym = cast(ScopeSymbol)ns;
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189 if ( scopesym is null )
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190 return ns;
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191 symbols = scopesym.symbols.named_symbols;
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192 return null;
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193 }
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194 }
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195 }
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196 else
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197 {
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198 foreach ( ns; symbols )
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199 {
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200 if ( name == ns.name_notype )
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201 {
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202 debug(findSymbol) DbgIO.println("%s == %s", name, ns.name_notype);
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203 ScopeSymbol scopesym = cast(ScopeSymbol)ns;
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204 if ( scopesym is null )
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205 return ns;
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206 symbols = scopesym.symbols.named_symbols;
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207 return null;
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208 }
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209 }
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210 }
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211 return null;
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212 }
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213
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214 /**********************************************************************************************
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215
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216 **********************************************************************************************/
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217 SymbolData loadSymbolData(NamedSymbol symbol)
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218 {
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219 StackSymbol stacksym = cast(StackSymbol)symbol;
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220 SymbolData symdata = new SymbolData;
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221 if ( stacksym !is null )
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222 {
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223 if ( stacksym.size == 0 )
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224 stacksym.size = codeView.sizeofCV(stacksym.cvdata.type);
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225 debug(eval) DbgIO.println("reading stack symbol size=%d cv type 0x%x", stacksym.size, stacksym.cvdata.type);
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226 if ( !stack.loadSymbolData(stacksym, symdata, frameLevel) )
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227 throw new EvaluationException("Couldn't load stack symbol "~symbol.name_notype);
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228 }
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229 else
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230 {
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231 DataSymbol datasym = cast(DataSymbol)symbol;
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232 if ( datasym !is null )
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233 {
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234 if ( datasym.size == 0 )
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235 datasym.size = codeView.sizeofCV(datasym.cvdata.type);
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236 debug(eval) DbgIO.println("reading global symbol size=%d cv type 0x%x", datasym.size, datasym.cvdata.type);
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237
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238 symdata.ptr = codeView.image.getSectionBase(datasym.cvdata.segment)+datasym.cvdata.offset;
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239 symdata.len = datasym.size;
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240 symdata.defered_load = true;
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241 }
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242 else
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243 throw new EvaluationException("Can only evaluate Data and Stack Data Symbols, yet");
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244 }
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245
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246 symdata.type = codeView.mangleType(symbol);
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247 if ( symdata.type is null )
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248 throw new EvaluationException("Symbol "~symbol.name_notype~" has unknown CV type");
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249 return symdata;
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250 }
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251
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252 /**********************************************************************************************
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253
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254 **********************************************************************************************/
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255 bool findMember(string ident, LeafFieldList lfl, inout size_t size, inout size_t offset, inout string type)
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256 {
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257 if ( lfl is null )
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258 return false;
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259 foreach ( l; lfl.fields )
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260 {
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261 if ( l.leaf_index == LF_BCLASS_16t )
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262 {
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263 LeafBaseClass lbc = cast(LeafBaseClass)l;
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264 assert ( lbc !is null );
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265 if ( lbc.type-0x1000 >= codeView.type_strings.length )
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266 {
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267 throw new EvaluationException(
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268 "unknown base class "~format("0x%04x", lbc.type)~" in type information for expression"
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269 );
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270 }
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271 LeafClassStruc lcs = cast(LeafClassStruc)codeView.type_strings[lbc.type-0x1000][0];
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272 assert ( lcs !is null );
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273 if ( lcs.field == 0 )
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274 continue;
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275 if ( lcs.field-0x1000 >= codeView.type_strings.length )
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276 {
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277 throw new EvaluationException(
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278 "unknown field list "~format("0x%04x", lcs.field)~" in type information for expression"
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279 );
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280 }
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281 Leaf[] fields = codeView.type_strings[lcs.field-0x1000];
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282 if ( findMember(ident, cast(LeafFieldList)fields[0], size, offset, type) )
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283 return true;
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284 }
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285 else if ( l.leaf_index == LF_MEMBER_16t )
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286 {
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287 LeafMember lm = cast(LeafMember)l;
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288 assert ( lm !is null );
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289 if ( lm.name != ident )
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290 continue;
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291 type = codeView.mangleCVtype(lm.type);
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292 size = codeView.sizeofCV(lm.type);
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293 offset = lm.offset.getUint;
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294 return true;
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295 }
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296 }
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297
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298 return false;
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299 }
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300
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301 /**********************************************************************************************
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302
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303 **********************************************************************************************/
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304 ubyte[] readMemory(size_t ptr, size_t len)
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305 {
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306 if ( miniDump !is null )
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307 return miniDump.readMemory(ptr, len);
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308
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309 if ( process is null )
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310 return null;
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311
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312 if ( len > process.MEMCHECK_MIN && process.isInvalidMem(ptr, len) )
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313 return null;
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314 ubyte data[] = new ubyte[len];
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315 if ( len != process.readProcessMemory(ptr, data.ptr, data.length) )
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316 return null;
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317 return data;
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318 }
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319 }
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320
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