1 | /** $Id: VDScriptInterp.cpp 65919 2017-03-01 18:24:27Z vboxsync $ */
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2 | /** @file
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3 | *
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4 | * VBox HDD container test utility - scripting engine, interpreter.
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5 | */
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6 |
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7 | /*
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8 | * Copyright (C) 2013-2016 Oracle Corporation
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9 | *
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10 | * This file is part of VirtualBox Open Source Edition (OSE), as
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11 | * available from http://www.virtualbox.org. This file is free software;
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12 | * you can redistribute it and/or modify it under the terms of the GNU
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13 | * General Public License (GPL) as published by the Free Software
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14 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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15 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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16 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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17 | */
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18 | #define LOGGROUP LOGGROUP_DEFAULT
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19 | #include <iprt/list.h>
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20 | #include <iprt/mem.h>
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21 | #include <iprt/assert.h>
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22 | #include <iprt/string.h>
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23 | #include <iprt/stream.h>
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24 |
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25 | #include <VBox/log.h>
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26 |
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27 | #include "VDScriptAst.h"
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28 | #include "VDScriptStack.h"
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29 | #include "VDScriptInternal.h"
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30 |
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31 | /**
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32 | * Interpreter variable.
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33 | */
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34 | typedef struct VDSCRIPTINTERPVAR
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35 | {
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36 | /** String space core. */
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37 | RTSTRSPACECORE Core;
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38 | /** Value. */
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39 | VDSCRIPTARG Value;
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40 | } VDSCRIPTINTERPVAR;
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41 | /** Pointer to an interpreter variable. */
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42 | typedef VDSCRIPTINTERPVAR *PVDSCRIPTINTERPVAR;
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43 |
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44 | /**
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45 | * Block scope.
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46 | */
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47 | typedef struct VDSCRIPTINTERPSCOPE
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48 | {
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49 | /** Pointer to the enclosing scope if available. */
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50 | struct VDSCRIPTINTERPSCOPE *pParent;
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51 | /** String space of declared variables in this scope. */
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52 | RTSTRSPACE hStrSpaceVar;
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53 | } VDSCRIPTINTERPSCOPE;
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54 | /** Pointer to a scope block. */
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55 | typedef VDSCRIPTINTERPSCOPE *PVDSCRIPTINTERPSCOPE;
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56 |
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57 | /**
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58 | * Function call.
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59 | */
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60 | typedef struct VDSCRIPTINTERPFNCALL
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61 | {
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62 | /** Pointer to the caller of this function. */
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63 | struct VDSCRIPTINTERPFNCALL *pCaller;
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64 | /** Root scope of this function. */
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65 | VDSCRIPTINTERPSCOPE ScopeRoot;
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66 | /** Current scope in this function. */
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67 | PVDSCRIPTINTERPSCOPE pScopeCurr;
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68 | } VDSCRIPTINTERPFNCALL;
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69 | /** Pointer to a function call. */
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70 | typedef VDSCRIPTINTERPFNCALL *PVDSCRIPTINTERPFNCALL;
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71 |
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72 | /**
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73 | * Interpreter context.
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74 | */
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75 | typedef struct VDSCRIPTINTERPCTX
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76 | {
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77 | /** Pointer to the script context. */
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78 | PVDSCRIPTCTXINT pScriptCtx;
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79 | /** Current function call entry. */
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80 | PVDSCRIPTINTERPFNCALL pFnCallCurr;
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81 | /** Stack of calculated values. */
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82 | VDSCRIPTSTACK StackValues;
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83 | /** Evaluation control stack. */
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84 | VDSCRIPTSTACK StackCtrl;
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85 | } VDSCRIPTINTERPCTX;
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86 | /** Pointer to an interpreter context. */
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87 | typedef VDSCRIPTINTERPCTX *PVDSCRIPTINTERPCTX;
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88 |
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89 | /**
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90 | * Interpreter control type.
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91 | */
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92 | typedef enum VDSCRIPTINTERPCTRLTYPE
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93 | {
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94 | VDSCRIPTINTERPCTRLTYPE_INVALID = 0,
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95 | /** Function call to evaluate now, all values are computed
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96 | * and are stored on the value stack.
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97 | */
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98 | VDSCRIPTINTERPCTRLTYPE_FN_CALL,
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99 | /** Cleanup the function call, deleting the scope and restoring the previous one. */
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100 | VDSCRIPTINTERPCTRLTYPE_FN_CALL_CLEANUP,
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101 | /** If statement to evaluate now, the guard is on the stack. */
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102 | VDSCRIPTINTERPCTRLTYPE_IF,
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103 | /** While or for statement. */
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104 | VDSCRIPTINTERPCTRLTYPE_LOOP,
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105 | /** switch statement. */
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106 | VDSCRIPTINTERPCTRLTYPE_SWITCH,
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107 | /** Compound statement. */
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108 | VDSCRIPTINTERPCTRLTYPE_COMPOUND,
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109 | /** 32bit blowup. */
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110 | VDSCRIPTINTERPCTRLTYPE_32BIT_HACK = 0x7fffffff
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111 | } VDSCRIPTINTERPCTRLTYPE;
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112 | /** Pointer to a control type. */
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113 | typedef VDSCRIPTINTERPCTRLTYPE *PVDSCRIPTINTERPCTRLTYPE;
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114 |
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115 | /**
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116 | * Interpreter stack control entry.
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117 | */
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118 | typedef struct VDSCRIPTINTERPCTRL
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119 | {
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120 | /** Flag whether this entry points to an AST node to evaluate. */
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121 | bool fEvalAst;
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122 | /** Flag dependent data. */
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123 | union
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124 | {
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125 | /** Pointer to the AST node to interprete. */
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126 | PVDSCRIPTASTCORE pAstNode;
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127 | /** Interpreter control structure. */
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128 | struct
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129 | {
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130 | /** Type of control. */
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131 | VDSCRIPTINTERPCTRLTYPE enmCtrlType;
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132 | /** Function call data. */
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133 | struct
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134 | {
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135 | /** Function to call. */
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136 | PVDSCRIPTFN pFn;
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137 | } FnCall;
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138 | /** Compound statement. */
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139 | struct
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140 | {
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141 | /** The compound statement node. */
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142 | PVDSCRIPTASTSTMT pStmtCompound;
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143 | /** Current statement evaluated. */
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144 | PVDSCRIPTASTSTMT pStmtCurr;
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145 | } Compound;
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146 | /** Pointer to an AST node. */
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147 | PVDSCRIPTASTCORE pAstNode;
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148 | } Ctrl;
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149 | };
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150 | } VDSCRIPTINTERPCTRL;
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151 | /** Pointer to an exec stack control entry. */
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152 | typedef VDSCRIPTINTERPCTRL *PVDSCRIPTINTERPCTRL;
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153 |
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154 | /**
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155 | * Record an error while interpreting.
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156 | *
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157 | * @returns VBox status code passed.
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158 | * @param pThis The interpreter context.
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159 | * @param rc The status code to record.
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160 | * @param RT_SRC_POS Position in the source code.
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161 | * @param pszFmt Format string.
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162 | */
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163 | static int vdScriptInterpreterError(PVDSCRIPTINTERPCTX pThis, int rc, RT_SRC_POS_DECL, const char *pszFmt, ...)
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164 | {
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165 | RT_NOREF1(pThis); RT_SRC_POS_NOREF();
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166 | va_list va;
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167 | va_start(va, pszFmt);
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168 | RTPrintfV(pszFmt, va);
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169 | va_end(va);
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170 | return rc;
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171 | }
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172 |
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173 | /**
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174 | * Pops the topmost value from the value stack.
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175 | *
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176 | * @returns nothing.
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177 | * @param pThis The interpreter context.
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178 | * @param pVal Where to store the value.
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179 | */
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180 | DECLINLINE(void) vdScriptInterpreterPopValue(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTARG pVal)
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181 | {
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182 | PVDSCRIPTARG pValStack = (PVDSCRIPTARG)vdScriptStackGetUsed(&pThis->StackValues);
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183 | if (!pValStack)
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184 | {
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185 | RT_ZERO(*pVal);
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186 | AssertPtrReturnVoid(pValStack);
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187 | }
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188 |
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189 | *pVal = *pValStack;
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190 | vdScriptStackPop(&pThis->StackValues);
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191 | }
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192 |
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193 | /**
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194 | * Pushes a given value onto the value stack.
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195 | */
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196 | DECLINLINE(int) vdScriptInterpreterPushValue(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTARG pVal)
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197 | {
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198 | PVDSCRIPTARG pValStack = (PVDSCRIPTARG)vdScriptStackGetUnused(&pThis->StackValues);
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199 | if (!pValStack)
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200 | return vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory pushing a value on the value stack");
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201 |
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202 | *pValStack = *pVal;
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203 | vdScriptStackPush(&pThis->StackValues);
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204 | return VINF_SUCCESS;
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205 | }
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206 |
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207 | /**
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208 | * Pushes an AST node onto the control stack.
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209 | *
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210 | * @returns VBox status code.
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211 | * @param pThis The interpreter context.
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212 | * @param enmCtrlType The control entry type.
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213 | */
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214 | DECLINLINE(int) vdScriptInterpreterPushAstEntry(PVDSCRIPTINTERPCTX pThis,
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215 | PVDSCRIPTASTCORE pAstNode)
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216 | {
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217 | PVDSCRIPTINTERPCTRL pCtrl = NULL;
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218 |
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219 | pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUnused(&pThis->StackCtrl);
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220 |
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221 | if (pCtrl)
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222 | {
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223 | pCtrl->fEvalAst = true;
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224 | pCtrl->pAstNode = pAstNode;
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225 | vdScriptStackPush(&pThis->StackCtrl);
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226 | return VINF_SUCCESS;
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227 | }
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228 |
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229 | return vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory adding an entry on the control stack");
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230 | }
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231 |
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232 | /**
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233 | * Pushes a control entry without additional data onto the stack.
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234 | *
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235 | * @returns VBox status code.
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236 | * @param pThis The interpreter context.
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237 | * @param enmCtrlType The control entry type.
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238 | */
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239 | DECLINLINE(int) vdScriptInterpreterPushNonDataCtrlEntry(PVDSCRIPTINTERPCTX pThis,
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240 | VDSCRIPTINTERPCTRLTYPE enmCtrlType)
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241 | {
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242 | PVDSCRIPTINTERPCTRL pCtrl = NULL;
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243 |
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244 | pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUnused(&pThis->StackCtrl);
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245 | if (pCtrl)
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246 | {
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247 | pCtrl->fEvalAst = false;
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248 | pCtrl->Ctrl.enmCtrlType = enmCtrlType;
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249 | vdScriptStackPush(&pThis->StackCtrl);
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250 | return VINF_SUCCESS;
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251 | }
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252 |
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253 | return vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory adding an entry on the control stack");
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254 | }
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255 |
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256 | /**
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257 | * Pushes a compound statement control entry onto the stack.
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258 | *
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259 | * @returns VBox status code.
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260 | * @param pThis The interpreter context.
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261 | * @param pStmtFirst The first statement of the compound statement
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262 | */
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263 | DECLINLINE(int) vdScriptInterpreterPushCompoundCtrlEntry(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTASTSTMT pStmt)
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264 | {
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265 | PVDSCRIPTINTERPCTRL pCtrl = NULL;
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266 |
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267 | pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUnused(&pThis->StackCtrl);
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268 | if (pCtrl)
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269 | {
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270 | pCtrl->fEvalAst = false;
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271 | pCtrl->Ctrl.enmCtrlType = VDSCRIPTINTERPCTRLTYPE_COMPOUND;
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272 | pCtrl->Ctrl.Compound.pStmtCompound = pStmt;
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273 | pCtrl->Ctrl.Compound.pStmtCurr = RTListGetFirst(&pStmt->Compound.ListStmts, VDSCRIPTASTSTMT, Core.ListNode);
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274 | vdScriptStackPush(&pThis->StackCtrl);
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275 | return VINF_SUCCESS;
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276 | }
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277 |
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278 | return vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory adding an entry on the control stack");
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279 | }
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280 |
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281 | /**
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282 | * Pushes a while statement control entry onto the stack.
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283 | *
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284 | * @returns VBox status code.
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285 | * @param pThis The interpreter context.
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286 | * @param pStmt The while statement.
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287 | */
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288 | DECLINLINE(int) vdScriptInterpreterPushWhileCtrlEntry(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTASTSTMT pStmt)
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289 | {
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290 | int rc = VINF_SUCCESS;
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291 | PVDSCRIPTINTERPCTRL pCtrl = NULL;
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292 |
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293 | pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUnused(&pThis->StackCtrl);
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294 | if (pCtrl)
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295 | {
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296 | pCtrl->fEvalAst = false;
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297 | pCtrl->Ctrl.enmCtrlType = VDSCRIPTINTERPCTRLTYPE_LOOP;
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298 | pCtrl->Ctrl.pAstNode = &pStmt->Core;
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299 | vdScriptStackPush(&pThis->StackCtrl);
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300 |
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301 | rc = vdScriptInterpreterPushAstEntry(pThis, &pStmt->While.pCond->Core);
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302 | if ( RT_SUCCESS(rc)
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303 | && pStmt->While.fDoWhile)
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304 | {
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305 | /* Push the statement to execute for do ... while loops because they run at least once. */
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306 | rc = vdScriptInterpreterPushAstEntry(pThis, &pStmt->While.pStmt->Core);
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307 | if (RT_FAILURE(rc))
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308 | {
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309 | /* Cleanup while control statement and AST node. */
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310 | vdScriptStackPop(&pThis->StackCtrl);
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311 | vdScriptStackPop(&pThis->StackCtrl);
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312 | }
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313 | }
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314 | else if (RT_FAILURE(rc))
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315 | vdScriptStackPop(&pThis->StackCtrl); /* Cleanup the while control statement. */
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316 | }
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317 | else
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318 | rc = vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory adding an entry on the control stack");
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319 |
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320 | return rc;
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321 | }
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322 |
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323 | /**
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324 | * Pushes an if statement control entry onto the stack.
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325 | *
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326 | * @returns VBox status code.
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327 | * @param pThis The interpreter context.
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328 | * @param pStmt The if statement.
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329 | */
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330 | static int vdScriptInterpreterPushIfCtrlEntry(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTASTSTMT pStmt)
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331 | {
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332 | int rc = VINF_SUCCESS;
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333 | PVDSCRIPTINTERPCTRL pCtrl = NULL;
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334 |
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335 | pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUnused(&pThis->StackCtrl);
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336 | if (pCtrl)
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337 | {
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338 | pCtrl->fEvalAst = false;
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339 | pCtrl->Ctrl.enmCtrlType = VDSCRIPTINTERPCTRLTYPE_IF;
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340 | pCtrl->Ctrl.pAstNode = &pStmt->Core;
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341 | vdScriptStackPush(&pThis->StackCtrl);
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342 |
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343 | rc = vdScriptInterpreterPushAstEntry(pThis, &pStmt->If.pCond->Core);
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344 | }
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345 | else
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346 | rc = vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory adding an entry on the control stack");
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347 |
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348 | return rc;
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349 | }
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350 |
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351 | /**
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352 | * Pushes a for statement control entry onto the stack.
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353 | *
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354 | * @returns VBox status code.
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355 | * @param pThis The interpreter context.
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356 | * @param pStmt The while statement.
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357 | */
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358 | DECLINLINE(int) vdScriptInterpreterPushForCtrlEntry(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTASTSTMT pStmt)
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359 | {
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360 | int rc = VINF_SUCCESS;
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361 | PVDSCRIPTINTERPCTRL pCtrl = NULL;
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362 |
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363 | pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUnused(&pThis->StackCtrl);
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364 | if (pCtrl)
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365 | {
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366 | pCtrl->fEvalAst = false;
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367 | pCtrl->Ctrl.enmCtrlType = VDSCRIPTINTERPCTRLTYPE_LOOP;
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368 | pCtrl->Ctrl.pAstNode = &pStmt->Core;
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369 | vdScriptStackPush(&pThis->StackCtrl);
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370 |
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371 | /* Push the conditional first and the initializer .*/
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372 | rc = vdScriptInterpreterPushAstEntry(pThis, &pStmt->For.pExprCond->Core);
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373 | if (RT_SUCCESS(rc))
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374 | {
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375 | rc = vdScriptInterpreterPushAstEntry(pThis, &pStmt->For.pExprStart->Core);
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376 | if (RT_FAILURE(rc))
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377 | vdScriptStackPop(&pThis->StackCtrl);
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378 | }
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379 | }
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380 | else
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381 | rc = vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory adding an entry on the control stack");
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382 |
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383 | return rc;
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384 | }
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385 |
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386 | /**
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387 | * Destroy variable string space callback.
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388 | */
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389 | static DECLCALLBACK(int) vdScriptInterpreterVarSpaceDestroy(PRTSTRSPACECORE pStr, void *pvUser)
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390 | {
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391 | RT_NOREF1(pvUser);
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392 | RTMemFree(pStr);
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393 | return VINF_SUCCESS;
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394 | }
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395 |
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396 | /**
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397 | * Setsup a new scope in the current function call.
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398 | *
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399 | * @returns VBox status code.
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400 | * @param pThis The interpreter context.
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401 | */
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402 | static int vdScriptInterpreterScopeCreate(PVDSCRIPTINTERPCTX pThis)
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403 | {
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404 | int rc = VINF_SUCCESS;
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405 | PVDSCRIPTINTERPSCOPE pScope = (PVDSCRIPTINTERPSCOPE)RTMemAllocZ(sizeof(VDSCRIPTINTERPSCOPE));
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406 | if (pScope)
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407 | {
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408 | pScope->pParent = pThis->pFnCallCurr->pScopeCurr;
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409 | pScope->hStrSpaceVar = NULL;
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410 | pThis->pFnCallCurr->pScopeCurr = pScope;
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411 | }
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412 | else
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413 | rc = vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory allocating new scope");
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414 |
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415 | return rc;
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416 | }
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417 |
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418 | /**
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419 | * Destroys the current scope.
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420 | *
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421 | * @returns nothing.
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422 | * @param pThis The interpreter context.
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423 | */
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424 | static void vdScriptInterpreterScopeDestroyCurr(PVDSCRIPTINTERPCTX pThis)
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425 | {
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426 | AssertMsgReturnVoid(pThis->pFnCallCurr->pScopeCurr != &pThis->pFnCallCurr->ScopeRoot,
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427 | ("Current scope is root scope of function call\n"));
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428 |
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429 | PVDSCRIPTINTERPSCOPE pScope = pThis->pFnCallCurr->pScopeCurr;
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430 | pThis->pFnCallCurr->pScopeCurr = pScope->pParent;
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431 | RTStrSpaceDestroy(&pScope->hStrSpaceVar, vdScriptInterpreterVarSpaceDestroy, NULL);
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432 | RTMemFree(pScope);
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433 | }
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434 |
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435 | /**
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436 | * Get the content of the given variable identifier from the current or parent scope.
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437 | */
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438 | static PVDSCRIPTINTERPVAR vdScriptInterpreterGetVar(PVDSCRIPTINTERPCTX pThis, const char *pszVar)
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439 | {
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440 | PVDSCRIPTINTERPSCOPE pScopeCurr = pThis->pFnCallCurr->pScopeCurr;
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441 | PVDSCRIPTINTERPVAR pVar = NULL;
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442 |
|
---|
443 | while ( !pVar
|
---|
444 | && pScopeCurr)
|
---|
445 | {
|
---|
446 | pVar = (PVDSCRIPTINTERPVAR)RTStrSpaceGet(&pScopeCurr->hStrSpaceVar, pszVar);
|
---|
447 | if (pVar)
|
---|
448 | break;
|
---|
449 | pScopeCurr = pScopeCurr->pParent;
|
---|
450 | }
|
---|
451 |
|
---|
452 |
|
---|
453 | return pVar;
|
---|
454 | }
|
---|
455 |
|
---|
456 | /**
|
---|
457 | * Evaluate an expression.
|
---|
458 | *
|
---|
459 | * @returns VBox status code.
|
---|
460 | * @param pThis The interpreter context.
|
---|
461 | * @param pExpr The expression to evaluate.
|
---|
462 | */
|
---|
463 | static int vdScriptInterpreterEvaluateExpression(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTASTEXPR pExpr)
|
---|
464 | {
|
---|
465 | int rc = VINF_SUCCESS;
|
---|
466 |
|
---|
467 | switch (pExpr->enmType)
|
---|
468 | {
|
---|
469 | case VDSCRIPTEXPRTYPE_PRIMARY_NUMCONST:
|
---|
470 | {
|
---|
471 | /* Push the numerical constant on the value stack. */
|
---|
472 | VDSCRIPTARG NumConst;
|
---|
473 | NumConst.enmType = VDSCRIPTTYPE_UINT64;
|
---|
474 | NumConst.u64 = pExpr->u64;
|
---|
475 | rc = vdScriptInterpreterPushValue(pThis, &NumConst);
|
---|
476 | break;
|
---|
477 | }
|
---|
478 | case VDSCRIPTEXPRTYPE_PRIMARY_STRINGCONST:
|
---|
479 | {
|
---|
480 | /* Push the string literal on the value stack. */
|
---|
481 | VDSCRIPTARG StringConst;
|
---|
482 | StringConst.enmType = VDSCRIPTTYPE_STRING;
|
---|
483 | StringConst.psz = pExpr->pszStr;
|
---|
484 | rc = vdScriptInterpreterPushValue(pThis, &StringConst);
|
---|
485 | break;
|
---|
486 | }
|
---|
487 | case VDSCRIPTEXPRTYPE_PRIMARY_BOOLEAN:
|
---|
488 | {
|
---|
489 | VDSCRIPTARG BoolConst;
|
---|
490 | BoolConst.enmType = VDSCRIPTTYPE_BOOL;
|
---|
491 | BoolConst.f = pExpr->f;
|
---|
492 | rc = vdScriptInterpreterPushValue(pThis, &BoolConst);
|
---|
493 | break;
|
---|
494 | }
|
---|
495 | case VDSCRIPTEXPRTYPE_PRIMARY_IDENTIFIER:
|
---|
496 | {
|
---|
497 | /* Look it up and push the value onto the value stack. */
|
---|
498 | PVDSCRIPTINTERPVAR pVar = vdScriptInterpreterGetVar(pThis, pExpr->pIde->aszIde);
|
---|
499 |
|
---|
500 | AssertPtrReturn(pVar, VERR_IPE_UNINITIALIZED_STATUS);
|
---|
501 | rc = vdScriptInterpreterPushValue(pThis, &pVar->Value);
|
---|
502 | break;
|
---|
503 | }
|
---|
504 | case VDSCRIPTEXPRTYPE_POSTFIX_INCREMENT:
|
---|
505 | case VDSCRIPTEXPRTYPE_POSTFIX_DECREMENT:
|
---|
506 | AssertMsgFailed(("TODO\n"));
|
---|
507 | /* fall thru */
|
---|
508 | case VDSCRIPTEXPRTYPE_POSTFIX_FNCALL:
|
---|
509 | {
|
---|
510 | PVDSCRIPTFN pFn = (PVDSCRIPTFN)RTStrSpaceGet(&pThis->pScriptCtx->hStrSpaceFn, pExpr->FnCall.pFnIde->pIde->aszIde);
|
---|
511 | if (pFn)
|
---|
512 | {
|
---|
513 | /* Push a function call control entry on the stack. */
|
---|
514 | PVDSCRIPTINTERPCTRL pCtrlFn = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUnused(&pThis->StackCtrl);
|
---|
515 | if (pCtrlFn)
|
---|
516 | {
|
---|
517 | pCtrlFn->fEvalAst = false;
|
---|
518 | pCtrlFn->Ctrl.enmCtrlType = VDSCRIPTINTERPCTRLTYPE_FN_CALL;
|
---|
519 | pCtrlFn->Ctrl.FnCall.pFn = pFn;
|
---|
520 | vdScriptStackPush(&pThis->StackCtrl);
|
---|
521 |
|
---|
522 | /* Push parameter expressions on the stack. */
|
---|
523 | PVDSCRIPTASTEXPR pArg = RTListGetFirst(&pExpr->FnCall.ListArgs, VDSCRIPTASTEXPR, Core.ListNode);
|
---|
524 | while (pArg)
|
---|
525 | {
|
---|
526 | rc = vdScriptInterpreterPushAstEntry(pThis, &pArg->Core);
|
---|
527 | if (RT_FAILURE(rc))
|
---|
528 | break;
|
---|
529 | pArg = RTListGetNext(&pExpr->FnCall.ListArgs, pArg, VDSCRIPTASTEXPR, Core.ListNode);
|
---|
530 | }
|
---|
531 | }
|
---|
532 | }
|
---|
533 | else
|
---|
534 | AssertMsgFailed(("Invalid program given, unknown function: %s\n", pExpr->FnCall.pFnIde->pIde->aszIde));
|
---|
535 | break;
|
---|
536 | }
|
---|
537 | case VDSCRIPTEXPRTYPE_UNARY_INCREMENT:
|
---|
538 | case VDSCRIPTEXPRTYPE_UNARY_DECREMENT:
|
---|
539 | case VDSCRIPTEXPRTYPE_UNARY_POSSIGN:
|
---|
540 | case VDSCRIPTEXPRTYPE_UNARY_NEGSIGN:
|
---|
541 | case VDSCRIPTEXPRTYPE_UNARY_INVERT:
|
---|
542 | case VDSCRIPTEXPRTYPE_UNARY_NEGATE:
|
---|
543 | case VDSCRIPTEXPRTYPE_MULTIPLICATION:
|
---|
544 | case VDSCRIPTEXPRTYPE_DIVISION:
|
---|
545 | case VDSCRIPTEXPRTYPE_MODULUS:
|
---|
546 | case VDSCRIPTEXPRTYPE_ADDITION:
|
---|
547 | case VDSCRIPTEXPRTYPE_SUBTRACTION:
|
---|
548 | case VDSCRIPTEXPRTYPE_LSR:
|
---|
549 | case VDSCRIPTEXPRTYPE_LSL:
|
---|
550 | case VDSCRIPTEXPRTYPE_LOWER:
|
---|
551 | case VDSCRIPTEXPRTYPE_HIGHER:
|
---|
552 | case VDSCRIPTEXPRTYPE_LOWEREQUAL:
|
---|
553 | case VDSCRIPTEXPRTYPE_HIGHEREQUAL:
|
---|
554 | case VDSCRIPTEXPRTYPE_EQUAL:
|
---|
555 | case VDSCRIPTEXPRTYPE_NOTEQUAL:
|
---|
556 | case VDSCRIPTEXPRTYPE_BITWISE_AND:
|
---|
557 | case VDSCRIPTEXPRTYPE_BITWISE_XOR:
|
---|
558 | case VDSCRIPTEXPRTYPE_BITWISE_OR:
|
---|
559 | case VDSCRIPTEXPRTYPE_LOGICAL_AND:
|
---|
560 | case VDSCRIPTEXPRTYPE_LOGICAL_OR:
|
---|
561 | case VDSCRIPTEXPRTYPE_ASSIGN:
|
---|
562 | case VDSCRIPTEXPRTYPE_ASSIGN_MULT:
|
---|
563 | case VDSCRIPTEXPRTYPE_ASSIGN_DIV:
|
---|
564 | case VDSCRIPTEXPRTYPE_ASSIGN_MOD:
|
---|
565 | case VDSCRIPTEXPRTYPE_ASSIGN_ADD:
|
---|
566 | case VDSCRIPTEXPRTYPE_ASSIGN_SUB:
|
---|
567 | case VDSCRIPTEXPRTYPE_ASSIGN_LSL:
|
---|
568 | case VDSCRIPTEXPRTYPE_ASSIGN_LSR:
|
---|
569 | case VDSCRIPTEXPRTYPE_ASSIGN_AND:
|
---|
570 | case VDSCRIPTEXPRTYPE_ASSIGN_XOR:
|
---|
571 | case VDSCRIPTEXPRTYPE_ASSIGN_OR:
|
---|
572 | case VDSCRIPTEXPRTYPE_ASSIGNMENT_LIST:
|
---|
573 | AssertMsgFailed(("TODO\n"));
|
---|
574 | /* fall thru */
|
---|
575 | default:
|
---|
576 | AssertMsgFailed(("Invalid expression type: %d\n", pExpr->enmType));
|
---|
577 | }
|
---|
578 | return rc;
|
---|
579 | }
|
---|
580 |
|
---|
581 | /**
|
---|
582 | * Evaluate a statement.
|
---|
583 | *
|
---|
584 | * @returns VBox status code.
|
---|
585 | * @param pThis The interpreter context.
|
---|
586 | * @param pStmt The statement to evaluate.
|
---|
587 | */
|
---|
588 | static int vdScriptInterpreterEvaluateStatement(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTASTSTMT pStmt)
|
---|
589 | {
|
---|
590 | int rc = VINF_SUCCESS;
|
---|
591 |
|
---|
592 | switch (pStmt->enmStmtType)
|
---|
593 | {
|
---|
594 | case VDSCRIPTSTMTTYPE_COMPOUND:
|
---|
595 | {
|
---|
596 | /* Setup new scope. */
|
---|
597 | rc = vdScriptInterpreterScopeCreate(pThis);
|
---|
598 | if (RT_SUCCESS(rc))
|
---|
599 | {
|
---|
600 | /** @todo Declarations */
|
---|
601 | rc = vdScriptInterpreterPushCompoundCtrlEntry(pThis, pStmt);
|
---|
602 | }
|
---|
603 | break;
|
---|
604 | }
|
---|
605 | case VDSCRIPTSTMTTYPE_EXPRESSION:
|
---|
606 | {
|
---|
607 | rc = vdScriptInterpreterPushAstEntry(pThis, &pStmt->pExpr->Core);
|
---|
608 | break;
|
---|
609 | }
|
---|
610 | case VDSCRIPTSTMTTYPE_IF:
|
---|
611 | {
|
---|
612 | rc = vdScriptInterpreterPushIfCtrlEntry(pThis, pStmt);
|
---|
613 | break;
|
---|
614 | }
|
---|
615 | case VDSCRIPTSTMTTYPE_SWITCH:
|
---|
616 | AssertMsgFailed(("TODO\n"));
|
---|
617 | break;
|
---|
618 | case VDSCRIPTSTMTTYPE_WHILE:
|
---|
619 | {
|
---|
620 | rc = vdScriptInterpreterPushWhileCtrlEntry(pThis, pStmt);
|
---|
621 | break;
|
---|
622 | }
|
---|
623 | case VDSCRIPTSTMTTYPE_RETURN:
|
---|
624 | {
|
---|
625 | /* Walk up the control stack until we reach a function cleanup entry. */
|
---|
626 | PVDSCRIPTINTERPCTRL pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUsed(&pThis->StackCtrl);
|
---|
627 | while ( pCtrl
|
---|
628 | && ( pCtrl->fEvalAst
|
---|
629 | || pCtrl->Ctrl.enmCtrlType != VDSCRIPTINTERPCTRLTYPE_FN_CALL_CLEANUP))
|
---|
630 | {
|
---|
631 | /* Cleanup up any compound statement scope. */
|
---|
632 | if ( !pCtrl->fEvalAst
|
---|
633 | && pCtrl->Ctrl.enmCtrlType == VDSCRIPTINTERPCTRLTYPE_COMPOUND)
|
---|
634 | vdScriptInterpreterScopeDestroyCurr(pThis);
|
---|
635 |
|
---|
636 | vdScriptStackPop(&pThis->StackCtrl);
|
---|
637 | pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUsed(&pThis->StackCtrl);
|
---|
638 | }
|
---|
639 | AssertMsg(VALID_PTR(pCtrl), ("Incorrect program, return outside of function\n"));
|
---|
640 | break;
|
---|
641 | }
|
---|
642 | case VDSCRIPTSTMTTYPE_FOR:
|
---|
643 | {
|
---|
644 | rc = vdScriptInterpreterPushForCtrlEntry(pThis, pStmt);
|
---|
645 | break;
|
---|
646 | }
|
---|
647 | case VDSCRIPTSTMTTYPE_CONTINUE:
|
---|
648 | {
|
---|
649 | /* Remove everything up to a loop control entry. */
|
---|
650 | PVDSCRIPTINTERPCTRL pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUsed(&pThis->StackCtrl);
|
---|
651 | while ( pCtrl
|
---|
652 | && ( pCtrl->fEvalAst
|
---|
653 | || pCtrl->Ctrl.enmCtrlType != VDSCRIPTINTERPCTRLTYPE_LOOP))
|
---|
654 | {
|
---|
655 | /* Cleanup up any compound statement scope. */
|
---|
656 | if ( !pCtrl->fEvalAst
|
---|
657 | && pCtrl->Ctrl.enmCtrlType == VDSCRIPTINTERPCTRLTYPE_COMPOUND)
|
---|
658 | vdScriptInterpreterScopeDestroyCurr(pThis);
|
---|
659 |
|
---|
660 | vdScriptStackPop(&pThis->StackCtrl);
|
---|
661 | pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUsed(&pThis->StackCtrl);
|
---|
662 | }
|
---|
663 | AssertMsg(VALID_PTR(pCtrl), ("Incorrect program, continue outside of loop\n"));
|
---|
664 |
|
---|
665 | /* Put the conditionals for while and for loops onto the control stack again. */
|
---|
666 | PVDSCRIPTASTSTMT pLoopStmt = (PVDSCRIPTASTSTMT)pCtrl->Ctrl.pAstNode;
|
---|
667 |
|
---|
668 | AssertMsg( pLoopStmt->enmStmtType == VDSCRIPTSTMTTYPE_WHILE
|
---|
669 | || pLoopStmt->enmStmtType == VDSCRIPTSTMTTYPE_FOR,
|
---|
670 | ("Invalid statement type, must be for or while loop\n"));
|
---|
671 |
|
---|
672 | if (pLoopStmt->enmStmtType == VDSCRIPTSTMTTYPE_FOR)
|
---|
673 | rc = vdScriptInterpreterPushAstEntry(pThis, &pLoopStmt->For.pExprCond->Core);
|
---|
674 | else if (!pLoopStmt->While.fDoWhile)
|
---|
675 | rc = vdScriptInterpreterPushAstEntry(pThis, &pLoopStmt->While.pCond->Core);
|
---|
676 | break;
|
---|
677 | }
|
---|
678 | case VDSCRIPTSTMTTYPE_BREAK:
|
---|
679 | {
|
---|
680 | /* Remove everything including the loop control statement. */
|
---|
681 | PVDSCRIPTINTERPCTRL pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUsed(&pThis->StackCtrl);
|
---|
682 | while ( pCtrl
|
---|
683 | && ( pCtrl->fEvalAst
|
---|
684 | || pCtrl->Ctrl.enmCtrlType != VDSCRIPTINTERPCTRLTYPE_LOOP))
|
---|
685 | {
|
---|
686 | /* Cleanup up any compound statement scope. */
|
---|
687 | if ( !pCtrl->fEvalAst
|
---|
688 | && pCtrl->Ctrl.enmCtrlType == VDSCRIPTINTERPCTRLTYPE_COMPOUND)
|
---|
689 | vdScriptInterpreterScopeDestroyCurr(pThis);
|
---|
690 |
|
---|
691 | vdScriptStackPop(&pThis->StackCtrl);
|
---|
692 | pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUsed(&pThis->StackCtrl);
|
---|
693 | }
|
---|
694 | AssertMsg(VALID_PTR(pCtrl), ("Incorrect program, break outside of loop\n"));
|
---|
695 | vdScriptStackPop(&pThis->StackCtrl); /* Remove loop control statement. */
|
---|
696 | break;
|
---|
697 | }
|
---|
698 | case VDSCRIPTSTMTTYPE_CASE:
|
---|
699 | case VDSCRIPTSTMTTYPE_DEFAULT:
|
---|
700 | AssertMsgFailed(("TODO\n"));
|
---|
701 | break;
|
---|
702 | default:
|
---|
703 | AssertMsgFailed(("Invalid statement type: %d\n", pStmt->enmStmtType));
|
---|
704 | }
|
---|
705 |
|
---|
706 | return rc;
|
---|
707 | }
|
---|
708 |
|
---|
709 | /**
|
---|
710 | * Evaluates the given AST node.
|
---|
711 | *
|
---|
712 | * @returns VBox statuse code.
|
---|
713 | * @param pThis The interpreter context.
|
---|
714 | * @param pAstNode The AST node to interpret.
|
---|
715 | */
|
---|
716 | static int vdScriptInterpreterEvaluateAst(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTASTCORE pAstNode)
|
---|
717 | {
|
---|
718 | int rc = VERR_NOT_IMPLEMENTED;
|
---|
719 |
|
---|
720 | switch (pAstNode->enmClass)
|
---|
721 | {
|
---|
722 | case VDSCRIPTASTCLASS_DECLARATION:
|
---|
723 | {
|
---|
724 | AssertMsgFailed(("TODO\n"));
|
---|
725 | break;
|
---|
726 | }
|
---|
727 | case VDSCRIPTASTCLASS_STATEMENT:
|
---|
728 | {
|
---|
729 | rc = vdScriptInterpreterEvaluateStatement(pThis, (PVDSCRIPTASTSTMT)pAstNode);
|
---|
730 | break;
|
---|
731 | }
|
---|
732 | case VDSCRIPTASTCLASS_EXPRESSION:
|
---|
733 | {
|
---|
734 | rc = vdScriptInterpreterEvaluateExpression(pThis, (PVDSCRIPTASTEXPR)pAstNode);
|
---|
735 | break;
|
---|
736 | }
|
---|
737 | /* These should never ever appear here. */
|
---|
738 | case VDSCRIPTASTCLASS_IDENTIFIER:
|
---|
739 | case VDSCRIPTASTCLASS_FUNCTION:
|
---|
740 | case VDSCRIPTASTCLASS_FUNCTIONARG:
|
---|
741 | case VDSCRIPTASTCLASS_INVALID:
|
---|
742 | default:
|
---|
743 | AssertMsgFailed(("Invalid AST node class: %d\n", pAstNode->enmClass));
|
---|
744 | }
|
---|
745 |
|
---|
746 | return rc;
|
---|
747 | }
|
---|
748 |
|
---|
749 | /**
|
---|
750 | * Evaluate a function call.
|
---|
751 | *
|
---|
752 | * @returns VBox status code.
|
---|
753 | * @param pThis The interpreter context.
|
---|
754 | * @param pFn The function execute.
|
---|
755 | */
|
---|
756 | static int vdScriptInterpreterFnCall(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTFN pFn)
|
---|
757 | {
|
---|
758 | int rc = VINF_SUCCESS;
|
---|
759 |
|
---|
760 | if (!pFn->fExternal)
|
---|
761 | {
|
---|
762 | PVDSCRIPTASTFN pAstFn = pFn->Type.Internal.pAstFn;
|
---|
763 |
|
---|
764 | /* Add function call cleanup marker on the stack first. */
|
---|
765 | rc = vdScriptInterpreterPushNonDataCtrlEntry(pThis, VDSCRIPTINTERPCTRLTYPE_FN_CALL_CLEANUP);
|
---|
766 | if (RT_SUCCESS(rc))
|
---|
767 | {
|
---|
768 | /* Create function call frame and set it up. */
|
---|
769 | PVDSCRIPTINTERPFNCALL pFnCall = (PVDSCRIPTINTERPFNCALL)RTMemAllocZ(sizeof(VDSCRIPTINTERPFNCALL));
|
---|
770 | if (pFnCall)
|
---|
771 | {
|
---|
772 | pFnCall->pCaller = pThis->pFnCallCurr;
|
---|
773 | pFnCall->ScopeRoot.pParent = NULL;
|
---|
774 | pFnCall->ScopeRoot.hStrSpaceVar = NULL;
|
---|
775 | pFnCall->pScopeCurr = &pFnCall->ScopeRoot;
|
---|
776 |
|
---|
777 | /* Add the variables, remember order. The first variable in the argument has the value at the top of the value stack. */
|
---|
778 | PVDSCRIPTASTFNARG pArg = RTListGetFirst(&pAstFn->ListArgs, VDSCRIPTASTFNARG, Core.ListNode);
|
---|
779 | for (unsigned i = 0; i < pAstFn->cArgs; i++)
|
---|
780 | {
|
---|
781 | PVDSCRIPTINTERPVAR pVar = (PVDSCRIPTINTERPVAR)RTMemAllocZ(sizeof(VDSCRIPTINTERPVAR));
|
---|
782 | if (pVar)
|
---|
783 | {
|
---|
784 | pVar->Core.pszString = pArg->pArgIde->aszIde;
|
---|
785 | pVar->Core.cchString = pArg->pArgIde->cchIde;
|
---|
786 | vdScriptInterpreterPopValue(pThis, &pVar->Value);
|
---|
787 | bool fInserted = RTStrSpaceInsert(&pFnCall->ScopeRoot.hStrSpaceVar, &pVar->Core);
|
---|
788 | Assert(fInserted); RT_NOREF_PV(fInserted);
|
---|
789 | }
|
---|
790 | else
|
---|
791 | {
|
---|
792 | rc = vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory creating a variable");
|
---|
793 | break;
|
---|
794 | }
|
---|
795 | pArg = RTListGetNext(&pAstFn->ListArgs, pArg, VDSCRIPTASTFNARG, Core.ListNode);
|
---|
796 | }
|
---|
797 |
|
---|
798 | if (RT_SUCCESS(rc))
|
---|
799 | {
|
---|
800 | /*
|
---|
801 | * Push compount statement on the control stack and make the newly created
|
---|
802 | * call frame the current one.
|
---|
803 | */
|
---|
804 | rc = vdScriptInterpreterPushAstEntry(pThis, &pAstFn->pCompoundStmts->Core);
|
---|
805 | if (RT_SUCCESS(rc))
|
---|
806 | pThis->pFnCallCurr = pFnCall;
|
---|
807 | }
|
---|
808 |
|
---|
809 | if (RT_FAILURE(rc))
|
---|
810 | {
|
---|
811 | RTStrSpaceDestroy(&pFnCall->ScopeRoot.hStrSpaceVar, vdScriptInterpreterVarSpaceDestroy, NULL);
|
---|
812 | RTMemFree(pFnCall);
|
---|
813 | }
|
---|
814 | }
|
---|
815 | else
|
---|
816 | rc = vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory creating a call frame");
|
---|
817 | }
|
---|
818 | }
|
---|
819 | else
|
---|
820 | {
|
---|
821 | /* External function call, build the argument list. */
|
---|
822 | if (pFn->cArgs)
|
---|
823 | {
|
---|
824 | PVDSCRIPTARG paArgs = (PVDSCRIPTARG)RTMemAllocZ(pFn->cArgs * sizeof(VDSCRIPTARG));
|
---|
825 | if (paArgs)
|
---|
826 | {
|
---|
827 | for (unsigned i = 0; i < pFn->cArgs; i++)
|
---|
828 | vdScriptInterpreterPopValue(pThis, &paArgs[i]);
|
---|
829 |
|
---|
830 | rc = pFn->Type.External.pfnCallback(paArgs, pFn->Type.External.pvUser);
|
---|
831 | RTMemFree(paArgs);
|
---|
832 | }
|
---|
833 | else
|
---|
834 | rc = vdScriptInterpreterError(pThis, VERR_NO_MEMORY, RT_SRC_POS,
|
---|
835 | "Out of memory creating argument array for external function call");
|
---|
836 | }
|
---|
837 | else
|
---|
838 | rc = pFn->Type.External.pfnCallback(NULL, pFn->Type.External.pvUser);
|
---|
839 | }
|
---|
840 |
|
---|
841 | return rc;
|
---|
842 | }
|
---|
843 |
|
---|
844 | /**
|
---|
845 | * Evaluate interpreter control statement.
|
---|
846 | *
|
---|
847 | * @returns VBox status code.
|
---|
848 | * @param pThis The interpreter context.
|
---|
849 | * @param pCtrl The control entry to evaluate.
|
---|
850 | */
|
---|
851 | static int vdScriptInterpreterEvaluateCtrlEntry(PVDSCRIPTINTERPCTX pThis, PVDSCRIPTINTERPCTRL pCtrl)
|
---|
852 | {
|
---|
853 | int rc = VINF_SUCCESS;
|
---|
854 |
|
---|
855 | Assert(!pCtrl->fEvalAst);
|
---|
856 | switch (pCtrl->Ctrl.enmCtrlType)
|
---|
857 | {
|
---|
858 | case VDSCRIPTINTERPCTRLTYPE_FN_CALL:
|
---|
859 | {
|
---|
860 | PVDSCRIPTFN pFn = pCtrl->Ctrl.FnCall.pFn;
|
---|
861 |
|
---|
862 | vdScriptStackPop(&pThis->StackCtrl);
|
---|
863 | rc = vdScriptInterpreterFnCall(pThis, pFn);
|
---|
864 | break;
|
---|
865 | }
|
---|
866 | case VDSCRIPTINTERPCTRLTYPE_FN_CALL_CLEANUP:
|
---|
867 | {
|
---|
868 | vdScriptStackPop(&pThis->StackCtrl);
|
---|
869 |
|
---|
870 | /* Delete function call entry. */
|
---|
871 | AssertPtr(pThis->pFnCallCurr);
|
---|
872 | PVDSCRIPTINTERPFNCALL pFnCallFree = pThis->pFnCallCurr;
|
---|
873 |
|
---|
874 | pThis->pFnCallCurr = pFnCallFree->pCaller;
|
---|
875 | Assert(pFnCallFree->pScopeCurr == &pFnCallFree->ScopeRoot);
|
---|
876 | RTStrSpaceDestroy(&pFnCallFree->ScopeRoot.hStrSpaceVar, vdScriptInterpreterVarSpaceDestroy, NULL);
|
---|
877 | RTMemFree(pFnCallFree);
|
---|
878 | break;
|
---|
879 | }
|
---|
880 | case VDSCRIPTINTERPCTRLTYPE_COMPOUND:
|
---|
881 | {
|
---|
882 | if (!pCtrl->Ctrl.Compound.pStmtCurr)
|
---|
883 | {
|
---|
884 | /* Evaluated last statement, cleanup and remove the control statement from the stack. */
|
---|
885 | vdScriptInterpreterScopeDestroyCurr(pThis);
|
---|
886 | vdScriptStackPop(&pThis->StackCtrl);
|
---|
887 | }
|
---|
888 | else
|
---|
889 | {
|
---|
890 | /* Push the current statement onto the control stack and move on. */
|
---|
891 | rc = vdScriptInterpreterPushAstEntry(pThis, &pCtrl->Ctrl.Compound.pStmtCurr->Core);
|
---|
892 | if (RT_SUCCESS(rc))
|
---|
893 | {
|
---|
894 | pCtrl->Ctrl.Compound.pStmtCurr = RTListGetNext(&pCtrl->Ctrl.Compound.pStmtCompound->Compound.ListStmts,
|
---|
895 | pCtrl->Ctrl.Compound.pStmtCurr, VDSCRIPTASTSTMT, Core.ListNode);
|
---|
896 | }
|
---|
897 | }
|
---|
898 | break;
|
---|
899 | }
|
---|
900 | case VDSCRIPTINTERPCTRLTYPE_LOOP:
|
---|
901 | {
|
---|
902 | PVDSCRIPTASTSTMT pLoopStmt = (PVDSCRIPTASTSTMT)pCtrl->Ctrl.pAstNode;
|
---|
903 |
|
---|
904 | /* Check whether the condition passed. */
|
---|
905 | VDSCRIPTARG Cond;
|
---|
906 | vdScriptInterpreterPopValue(pThis, &Cond);
|
---|
907 | AssertMsg(Cond.enmType == VDSCRIPTTYPE_BOOL,
|
---|
908 | ("Value on stack is not of boolean type\n"));
|
---|
909 |
|
---|
910 | if (Cond.f)
|
---|
911 | {
|
---|
912 | /* Execute the loop another round. */
|
---|
913 | if (pLoopStmt->enmStmtType == VDSCRIPTSTMTTYPE_WHILE)
|
---|
914 | {
|
---|
915 | rc = vdScriptInterpreterPushAstEntry(pThis, &pLoopStmt->While.pCond->Core);
|
---|
916 | if (RT_SUCCESS(rc))
|
---|
917 | {
|
---|
918 | rc = vdScriptInterpreterPushAstEntry(pThis, &pLoopStmt->While.pStmt->Core);
|
---|
919 | if (RT_FAILURE(rc))
|
---|
920 | vdScriptStackPop(&pThis->StackCtrl);
|
---|
921 | }
|
---|
922 | }
|
---|
923 | else
|
---|
924 | {
|
---|
925 | AssertMsg(pLoopStmt->enmStmtType == VDSCRIPTSTMTTYPE_FOR,
|
---|
926 | ("Not a for statement\n"));
|
---|
927 |
|
---|
928 | rc = vdScriptInterpreterPushAstEntry(pThis, &pLoopStmt->For.pExprCond->Core);
|
---|
929 | if (RT_SUCCESS(rc))
|
---|
930 | {
|
---|
931 | rc = vdScriptInterpreterPushAstEntry(pThis, &pLoopStmt->For.pExpr3->Core);
|
---|
932 | if (RT_SUCCESS(rc))
|
---|
933 | {
|
---|
934 | rc = vdScriptInterpreterPushAstEntry(pThis, &pLoopStmt->For.pStmt->Core);
|
---|
935 | if (RT_FAILURE(rc))
|
---|
936 | vdScriptStackPop(&pThis->StackCtrl);
|
---|
937 | }
|
---|
938 |
|
---|
939 | if (RT_FAILURE(rc))
|
---|
940 | vdScriptStackPop(&pThis->StackCtrl);
|
---|
941 | }
|
---|
942 | }
|
---|
943 | }
|
---|
944 | else
|
---|
945 | vdScriptStackPop(&pThis->StackCtrl); /* Remove loop control statement. */
|
---|
946 | break;
|
---|
947 | }
|
---|
948 | case VDSCRIPTINTERPCTRLTYPE_IF:
|
---|
949 | {
|
---|
950 | PVDSCRIPTASTSTMT pIfStmt = (PVDSCRIPTASTSTMT)pCtrl->Ctrl.pAstNode;
|
---|
951 |
|
---|
952 | vdScriptStackPop(&pThis->StackCtrl); /* Remove if control statement. */
|
---|
953 |
|
---|
954 | /* Check whether the condition passed. */
|
---|
955 | VDSCRIPTARG Cond;
|
---|
956 | vdScriptInterpreterPopValue(pThis, &Cond);
|
---|
957 | AssertMsg(Cond.enmType == VDSCRIPTTYPE_BOOL,
|
---|
958 | ("Value on stack is not of boolean type\n"));
|
---|
959 |
|
---|
960 | if (Cond.f)
|
---|
961 | {
|
---|
962 | /* Execute the true branch. */
|
---|
963 | rc = vdScriptInterpreterPushAstEntry(pThis, &pIfStmt->If.pTrueStmt->Core);
|
---|
964 | }
|
---|
965 | else if (pIfStmt->If.pElseStmt)
|
---|
966 | rc = vdScriptInterpreterPushAstEntry(pThis, &pIfStmt->If.pElseStmt->Core);
|
---|
967 |
|
---|
968 | break;
|
---|
969 | }
|
---|
970 | default:
|
---|
971 | AssertMsgFailed(("Invalid evaluation control type on the stack: %d\n",
|
---|
972 | pCtrl->Ctrl.enmCtrlType));
|
---|
973 | }
|
---|
974 |
|
---|
975 | return rc;
|
---|
976 | }
|
---|
977 |
|
---|
978 | /**
|
---|
979 | * The interpreter evaluation core loop.
|
---|
980 | *
|
---|
981 | * @returns VBox status code.
|
---|
982 | * @param pThis The interpreter context.
|
---|
983 | */
|
---|
984 | static int vdScriptInterpreterEvaluate(PVDSCRIPTINTERPCTX pThis)
|
---|
985 | {
|
---|
986 | int rc = VINF_SUCCESS;
|
---|
987 | PVDSCRIPTINTERPCTRL pCtrl = NULL;
|
---|
988 |
|
---|
989 | pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUsed(&pThis->StackCtrl);
|
---|
990 | while (pCtrl)
|
---|
991 | {
|
---|
992 | if (pCtrl->fEvalAst)
|
---|
993 | {
|
---|
994 | PVDSCRIPTASTCORE pAstNode = pCtrl->pAstNode;
|
---|
995 | vdScriptStackPop(&pThis->StackCtrl);
|
---|
996 |
|
---|
997 | rc = vdScriptInterpreterEvaluateAst(pThis, pAstNode);
|
---|
998 | }
|
---|
999 | else
|
---|
1000 | rc = vdScriptInterpreterEvaluateCtrlEntry(pThis, pCtrl);
|
---|
1001 |
|
---|
1002 | pCtrl = (PVDSCRIPTINTERPCTRL)vdScriptStackGetUsed(&pThis->StackCtrl);
|
---|
1003 | }
|
---|
1004 |
|
---|
1005 | return rc;
|
---|
1006 | }
|
---|
1007 |
|
---|
1008 | DECLHIDDEN(int) vdScriptCtxInterprete(PVDSCRIPTCTXINT pThis, const char *pszFn,
|
---|
1009 | PVDSCRIPTARG paArgs, unsigned cArgs,
|
---|
1010 | PVDSCRIPTARG pRet)
|
---|
1011 | {
|
---|
1012 | RT_NOREF1(pRet);
|
---|
1013 | int rc = VINF_SUCCESS;
|
---|
1014 | VDSCRIPTINTERPCTX InterpCtx;
|
---|
1015 | PVDSCRIPTFN pFn = NULL;
|
---|
1016 |
|
---|
1017 | AssertPtrReturn(pThis, VERR_INVALID_POINTER);
|
---|
1018 | AssertPtrReturn(pszFn, VERR_INVALID_POINTER);
|
---|
1019 | AssertReturn( (!cArgs && !paArgs)
|
---|
1020 | || (cArgs && paArgs), VERR_INVALID_PARAMETER);
|
---|
1021 |
|
---|
1022 | InterpCtx.pScriptCtx = pThis;
|
---|
1023 | InterpCtx.pFnCallCurr = NULL;
|
---|
1024 | vdScriptStackInit(&InterpCtx.StackValues, sizeof(VDSCRIPTARG));
|
---|
1025 | vdScriptStackInit(&InterpCtx.StackCtrl, sizeof(VDSCRIPTINTERPCTRL));
|
---|
1026 |
|
---|
1027 | pFn = (PVDSCRIPTFN)RTStrSpaceGet(&pThis->hStrSpaceFn, pszFn);
|
---|
1028 | if (pFn)
|
---|
1029 | {
|
---|
1030 | if (cArgs == pFn->cArgs)
|
---|
1031 | {
|
---|
1032 | /* Push the arguments onto the stack. */
|
---|
1033 | /** @todo Check expected and given argument types. */
|
---|
1034 | for (unsigned i = 0; i < cArgs; i++)
|
---|
1035 | {
|
---|
1036 | PVDSCRIPTARG pArg = (PVDSCRIPTARG)vdScriptStackGetUnused(&InterpCtx.StackValues);
|
---|
1037 | *pArg = paArgs[i];
|
---|
1038 | vdScriptStackPush(&InterpCtx.StackValues);
|
---|
1039 | }
|
---|
1040 |
|
---|
1041 | if (RT_SUCCESS(rc))
|
---|
1042 | {
|
---|
1043 | /* Setup function call frame and parameters. */
|
---|
1044 | rc = vdScriptInterpreterFnCall(&InterpCtx, pFn);
|
---|
1045 | if (RT_SUCCESS(rc))
|
---|
1046 | {
|
---|
1047 | /* Run the interpreter. */
|
---|
1048 | rc = vdScriptInterpreterEvaluate(&InterpCtx);
|
---|
1049 | vdScriptStackDestroy(&InterpCtx.StackValues);
|
---|
1050 | vdScriptStackDestroy(&InterpCtx.StackCtrl);
|
---|
1051 | }
|
---|
1052 | }
|
---|
1053 | }
|
---|
1054 | else
|
---|
1055 | rc = vdScriptInterpreterError(&InterpCtx, VERR_INVALID_PARAMETER, RT_SRC_POS, "Invalid number of parameters, expected %d got %d", pFn->cArgs, cArgs);
|
---|
1056 | }
|
---|
1057 | else
|
---|
1058 | rc = vdScriptInterpreterError(&InterpCtx, VERR_NOT_FOUND, RT_SRC_POS, "Function with identifier \"%s\" not found", pszFn);
|
---|
1059 |
|
---|
1060 |
|
---|
1061 | return rc;
|
---|
1062 | }
|
---|