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annotate LightClone/Source/VirtualMachine.cpp @ 54:95677f648a2c VirtualMachine Mk2

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Refactored VirtualMachine
author koryspansel
date Fri, 30 Sep 2011 18:37:54 -0700
parents 4663f93aefc4
children dc1f4a668d50
rev   line source
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1 /*
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2 * VirtualMachine.cpp
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3 */
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4
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5 #include "VirtualMachine.h"
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6
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7 /*
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8 * VirtualMachine
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9 */
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10 VirtualMachine::VirtualMachine() : nInstructionPointer(0), pFrame(NULL)
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11 {
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12 Clear();
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13 }
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14
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15 /*
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16 * Step
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17 */
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18 uint32 VirtualMachine::Step()
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19 {
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20 const uint8 nInstruction = Advance();
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21 TRACE("Read instruction %d at address %d\n", nInstruction, nInstructionPointer - 1);
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22
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23 if(nInstruction == Instruction_Action)
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24 {
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25 const uint8 nParameter = Advance();
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26 TRACE(" -- Action Decoded: %d\n", nParameter);
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27
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28 return nParameter;
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29 }
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30 else
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31
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32 if(nInstruction == Instruction_Call)
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33 {
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34 const uint8 nParameter = Advance();
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35 TRACE(" -- Call Decoded: %d\n", nParameter);
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36
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37 const uint32 nFunction = nParameter;
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38 const uint32 nContinuation = nInstructionPointer;
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39
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40 PushFrame(nFunction, nContinuation);
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41 }
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42 else
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43
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44 if(nInstruction == Instruction_Return)
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45 {
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46 if(pFrame)
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47 {
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48 PopFrame();
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49 }
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50 else
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51 {
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52 // no frame to pop, we are done
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53 return Action_Complete;
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54 }
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55 }
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56
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57 return Action_None;
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58 }
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59
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60 /*
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61 * Reset
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62 */
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63 void VirtualMachine::Reset()
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64 {
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65 nInstructionPointer = 0;
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66 }
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67
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68 /*
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69 * Clear
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70 */
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71 void VirtualMachine::Clear()
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72 {
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73 for(uint32 i = 0; i < Capacity; ++i)
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74 {
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75 nMemory[i] = 0;
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76 }
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77 }
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78
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79 /*
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80 * GetMemorySize
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81 */
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82 uint32 VirtualMachine::GetMemorySize() const
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83 {
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84 return Capacity;
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85 }
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86
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87 /*
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88 * GetMemoryPointer
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89 */
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90 uint8* VirtualMachine::GetMemoryPointer()
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91 {
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92 return &nMemory[0];
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93 }
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94
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95 /*
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96 * PushFrame
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97 */
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98 void VirtualMachine::PushFrame(uint32 nFunctionAddress, uint32 nContinuationAddress)
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99 {
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100 Frame* pInstance = pFrame;
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101
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102 while(pInstance)
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103 {
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104 if(pInstance->nAddress == nFunctionAddress && pInstance->nContinuation == nContinuationAddress)
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105 {
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106 break;
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107 }
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108
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109 pInstance = pInstance->pLast;
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110 }
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111
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112 if(pInstance)
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113 {
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114 while(pFrame && pFrame != pInstance)
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115 {
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116 Frame* pValue = pFrame;
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117 pFrame = pValue->pLast;
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118
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119 kFrameAllocator.Free(pValue);
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120 }
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121
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122 //ASSERT(pFrame != NULL);
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123 }
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124 else
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125 {
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126 pInstance = kFrameAllocator.Allocate();
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127 pInstance->nAddress = nFunctionAddress;
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128 pInstance->nContinuation = nContinuationAddress;
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129 pInstance->pLast = pFrame;
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130
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131 pFrame = pInstance;
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132 }
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133
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134 nInstructionPointer = nFunctionAddress;
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135 }
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136
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137 /*
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138 * PopFrame
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139 */
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140 void VirtualMachine::PopFrame()
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141 {
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142 if(pFrame)
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143 {
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144 nInstructionPointer = pFrame->nContinuation;
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145
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146 Frame* pInstance = pFrame;
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147 pFrame = pInstance->pLast;
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148
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149 kFrameAllocator.Free(pInstance);
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150 }
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151 else
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152 {
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153 }
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154 }