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1
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2 /* Digital Mars DMDScript source code.
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3 * Copyright (c) 2000-2002 by Chromium Communications
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4 * D version Copyright (c) 2004-2006 by Digital Mars
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5 * All Rights Reserved
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6 * written by Walter Bright
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7 * www.digitalmars.com
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8 * Use at your own risk. There is no warranty, express or implied.
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9 * License for redistribution is by the GNU General Public License in gpl.txt.
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10 *
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11 * A binary, non-exclusive license for commercial use can be
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12 * purchased from www.digitalmars.com/dscript/buy.html.
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13 *
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14 * DMDScript is implemented in the D Programming Language,
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15 * www.digitalmars.com/d/
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16 *
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17 * For a C++ implementation of DMDScript, including COM support,
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18 * see www.digitalmars.com/dscript/cppscript.html.
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19 */
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20
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21
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3
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22 module dmdscript_tango.ddeclaredfunction;
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0
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23
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24 import std.stdio;
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25 import std.c.stdlib;
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26
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3
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27 import dmdscript_tango.script;
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28 import dmdscript_tango.dobject;
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29 import dmdscript_tango.dfunction;
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30 import dmdscript_tango.darguments;
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31 import dmdscript_tango.opcodes;
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32 import dmdscript_tango.ir;
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33 import dmdscript_tango.identifier;
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34 import dmdscript_tango.value;
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35 import dmdscript_tango.functiondefinition;
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36 import dmdscript_tango.text;
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37 import dmdscript_tango.property;
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0
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38
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39 /* ========================== DdeclaredFunction ================== */
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40
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41 class DdeclaredFunction : Dfunction
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42 {
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43 FunctionDefinition fd;
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44
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45 this(FunctionDefinition fd)
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46 {
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47 super(fd.parameters.length, Dfunction.getPrototype());
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48 assert(Dfunction.getPrototype());
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49 assert(internal_prototype);
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50 this.fd = fd;
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51
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52 Dobject o;
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53
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54 // ECMA 3 13.2
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55 o = new Dobject(Dobject.getPrototype()); // step 9
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56 Put(TEXT_prototype, o, DontEnum); // step 11
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57 o.Put(TEXT_constructor, this, DontEnum); // step 10
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58 }
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59
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60 void *Call(CallContext *cc, Dobject othis, Value* ret, Value[] arglist)
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61 {
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62 // 1. Create activation object per ECMA 10.1.6
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63 // 2. Instantiate function variables as properties of
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64 // activation object
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65 // 3. The 'this' value is the activation object
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66
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67 Dobject actobj; // activation object
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68 Darguments args;
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69 Value[] locals;
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70 uint i;
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71 void *result;
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72
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73 //writefln("DdeclaredFunction.Call() '%s'", toString());
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74 //writefln("this.scopex.length = %d", this.scopex.length);
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75 //writefln("\tinstantiate(this = %x, fd = %x)", cast(uint)cast(void*)this, cast(uint)cast(void*)fd);
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76
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77 // if it's an empty function, just return
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78 if (fd.code[0].opcode == IRret)
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79 {
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80 return null;
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81 }
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82
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83 // Generate the activation object
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84 // ECMA v3 10.1.6
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85 actobj = new Dobject(null);
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86
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87 // Instantiate the parameters
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88 {
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89 uint a = 0;
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90 foreach (Identifier* p; fd.parameters)
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91 {
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92 Value* v = (a < arglist.length) ? &arglist[a++] : &vundefined;
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93 actobj.Put(p.toString(), v, DontDelete);
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94 }
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95 }
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96
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97 // Generate the Arguments Object
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98 // ECMA v3 10.1.8
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99 args = new Darguments(cc.caller, this, actobj, fd.parameters, arglist);
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100
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101 actobj.Put(TEXT_arguments, args, DontDelete);
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102
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103 // The following is not specified by ECMA, but seems to be supported
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104 // by jscript. The url www.grannymail.com has the following code
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105 // which looks broken to me but works in jscript:
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106 //
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107 // function MakeArray() {
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108 // this.length = MakeArray.arguments.length
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109 // for (var i = 0; i < this.length; i++)
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110 // this[i+1] = arguments[i]
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111 // }
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112 // var cardpic = new MakeArray("LL","AP","BA","MB","FH","AW","CW","CV","DZ");
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113 Put(TEXT_arguments, args, DontDelete); // make grannymail bug work
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114
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115 auto scoperootsave = cc.scoperoot;
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116
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117 /* If calling a nested function, need to increase scoperoot
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118 */
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119 if (fd.enclosingFunction == cc.callerf)
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120 { assert(cc.scoperoot < cc.scopex.length);
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121 cc.scoperoot++;
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122 }
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123 else
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124 {
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125 auto df = cast(DdeclaredFunction)cc.caller;
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126 if (df && !fd.isanonymous)
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127 {
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128 version (none)
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129 {
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130 writefln("current nestDepth = %d, calling %d, cc.scopex.length = %d",
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131 df.fd.nestDepth,
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132 fd.nestDepth,
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133 cc.scopex.length);
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134 }
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135 int diff = df.fd.nestDepth - fd.nestDepth;
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136 if (diff > 0)
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137 { if (diff >= cc.scoperoot)
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138 writefln("diff %s cc.scoperoot %s", diff, cc.scoperoot);
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139 else
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140 cc.scoperoot -= diff;
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141 assert(cc.scoperoot >= 1);
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142 }
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143 }
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144 }
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145
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146 Dobject[] scopesave = cc.scopex;
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147
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148 Dobject[] scopex;
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149 //scopex = cc.scopex[0 .. cc.scoperoot].dup;
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150 scopex = this.scopex.dup;
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151 if (scopex.length == 0)
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152 { this.scopex = cc.scopex[0 .. cc.scoperoot];
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153 scopex = this.scopex.dup;
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154 }
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155 scopex ~= actobj;
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156
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157 fd.instantiate(scopex, actobj, DontDelete);
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158
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159 cc.scopex = scopex;
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160 Dobject variablesave = cc.variable;
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161 cc.variable = actobj;
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162 auto callersave = cc.caller;
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163 cc.caller = this;
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164 auto callerfsave = cc.callerf;
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165 cc.callerf = fd;
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166
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167 Value[] p1;
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168 Value* v;
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169 if (fd.nlocals < 128)
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170 v = cast(Value*) alloca(fd.nlocals * Value.sizeof);
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171 if (v)
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172 locals = v[0 .. fd.nlocals];
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173 else
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174 {
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175 p1 = new Value[fd.nlocals];
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176 locals = p1;
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177 }
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178
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179 result = IR.call(cc, othis, fd.code, ret, locals.ptr);
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180
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181 delete p1;
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182
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183 cc.callerf = callerfsave;
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184 cc.caller = callersave;
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185 cc.variable = variablesave;
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186 cc.scopex = scopesave;
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187 cc.scoperoot = scoperootsave;
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188
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189 // Remove the arguments object
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190 //Value* v;
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191 //v=Get(TEXT_arguments);
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192 //writef("1v = %x, %s, v.object = %x\n", v, v.getType(), v.object);
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193 Put(TEXT_arguments, &vundefined, 0);
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194 //actobj.Put(TEXT_arguments, &vundefined, 0);
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195
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196 version (none)
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197 {
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198 writef("args = %x, actobj = %x\n", args, actobj);
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199 v=Get(TEXT_arguments);
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200 writef("2v = %x, %s, v.object = %x\n", v, v.getType(), v.object);
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201 v.object = null;
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202
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203 {
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204 uint *p = cast(uint *)0x40a49a80;
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205 uint i;
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206 for (i = 0; i < 16; i++)
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207 {
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208 writef("p[%x] = %x\n", &p[i], p[i]);
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209 }
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210 }
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211 }
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212
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213 return result;
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214 }
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215
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216 void *Construct(CallContext *cc, Value *ret, Value[] arglist)
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217 {
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218 // ECMA 3 13.2.2
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219 Dobject othis;
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220 Dobject proto;
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221 Value* v;
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222 void *result;
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223
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224 v = Get(TEXT_prototype);
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225 if (v.isPrimitive())
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226 proto = Dobject.getPrototype();
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227 else
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228 proto = v.toObject();
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229 othis = new Dobject(proto);
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230 result = Call(cc, othis, ret, arglist);
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231 if (!result)
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232 {
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233 if (ret.isPrimitive())
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234 ret.putVobject(othis);
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235 }
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236 return result;
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237 }
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238
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239 d_string toString()
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240 {
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241 d_string s;
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242
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243 //writef("DdeclaredFunction.toString()\n");
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244 fd.toBuffer(s);
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245 return s;
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246 }
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247 }
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248
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249
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