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annotate cbackend.js @ 34:a10f1b049193

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Working closures, but need to rethink method call strategy
author Mike Pavone <pavone@retrodev.com>
date Mon, 09 Jul 2012 08:57:50 -0700
parents 64f1d516fbfd
children bf5e88f6419d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 var mainModule;
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2 var modules = {};
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3
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4 var nextmethodId = 0;
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5 var methodIds = {};
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6 function getMethodId(methodName)
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7 {
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8 if (!(methodName in methodIds)) {
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9 methodIds[methodName] = nextmethodId++;
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10
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11 }
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12 return methodIds[methodName];
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13 }
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14
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15 function importSym(obj, src, key)
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16 {
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17 if(!(key in src)) {
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18 throw new Error(key +' not found in source object for import');
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19 }
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20 if(key in obj) {
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21 throw new Error(key +' already exists in target object for import')
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22 }
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23 obj[key] = src[key];
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24 }
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25
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26 function doImport(obj, src, symlist)
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27 {
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28 if (symlist === undefined) {
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29 each(src, function(key,val) {
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30 if (key != 'parent') {
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31 importSym(obj, src, key);
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32 }
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33 });
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34 } else {
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35 for (var i = 0; i < symlist.length; ++i) {
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36 importSym(obj, src, symlist[i]);
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37 }
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38 }
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39 return obj;
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40 }
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41
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42 op.prototype.toC = function(isReceiver) {
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43 var optoMeth = {'+': 'ADD_', '-': 'SUB_', '*': 'MUL_', '/': 'DIV_', '=': 'EQ_', '!=': 'NEQ_', '<': 'LT_', '>': 'GT_', '>=': 'GEQ_', '<=': 'LEQ_'};
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44 var method = optoMeth[this.op];
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45 var ret = '(params[0] = ' + this.left.toC() + ',\n';
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46 ret += 'params[1] = ' + this.right.toC() + ',\n';
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47 ret += 'mcall(' + getMethodId(method) + ', 2, params))\n';
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48 return ret;
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49 };
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50
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51 function escapeCName(name)
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52 {
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53 if (name == 'self') {
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54 return name;
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55 }
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56 name = name.replace("_", "UN_").replace(":", "CN_").replace("!", "EX_").replace('?', 'QS_').replace('@', 'AT_');
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57 name = 'tp_' + name;
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58 return name;
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59 }
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60
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61 symbol.prototype.toC = function() {
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62 var name = this.cleanName();
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63 var info = this.symbols.find(name);
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64 if (!info) {
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65 throw new Error('symbol ' + name + ' not found');
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66 }
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67 var pre = '';
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68 console.log('symbol', info);
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69 switch(info.type) {
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70 case 'self':
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71 pre = 'self->';
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72 break;
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73 case 'parent':
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74 pre = 'self->';
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75 for (var i = 0; i < info.depth; ++i) {
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76 pre += 'parent->';
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77 }
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78 break;
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79 case 'upvar':
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80 pre = 'env->';
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81 for (var i = 1; i < info.depth; ++i) {
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82 pre += 'parent->';
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83 }
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84 break;
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85 case 'toplevel':
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86 pre = 'modules.';
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87 modules[name] = false;
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88 break;
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89 case 'closedover':
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90 pre = 'myenv->';
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91 }
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92 return pre + escapeCName(name);
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93 }
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94
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95 var declaredInts = {};
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96
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97 intlit.prototype.toC = function() {
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98 var str = this.val.toString();
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99 if (!(this.val in declaredInts)) {
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100 toplevelcode += 'obj_int32 int32_' + str + ' = {{&obj_int32_meta, NULL}, ' + str + '};\n';
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101 declaredInts[this.val] = true;
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102 }
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103 return '((object *)&int32_' + str + ')';
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104 }
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105
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106 floatlit.prototype.toC = function() {
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107 return 'make_float(' + this.val.toString() + ')';
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108 }
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109
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110 strlit.prototype.toC = function() {
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111 return 'make_str("' + this.val.replace('\\', '\\\\').replace('"', '\\"').replace('\n', '\\n').replace('\r', '\\r') + '")';
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112 }
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113
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114 listlit.prototype.toC = function() {
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115 var ret = 'make_list(';
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116 each(this.val, function(idx, el) {
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117 ret += (idx ? ', ' : '') + el.toC();
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118 });
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119 return ret + ')';
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120 }
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121
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122 funcall.prototype.toC = function() {
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123 var name = this.name[this.name.length-1] == ':' ? this.name.substr(0, this.name.length-1) : this.name;
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124 if (name == 'foreign') {
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125 if ((this.args[0] instanceof lambda) || (this.args[0] instanceof object)) {
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126 return null;
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127 } else if(this.args[0] instanceof symbol) {
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128 return this.args[0].name;
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129 } else {
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130 throw new Error("Unexpected AST type for foreign:");
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131 }
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132 }
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133 var args = this.args.slice(0, this.args.length);
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134 if (this.receiver) {
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135 args.splice(0, 0, this.receiver);
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136 }
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137 var method = false;
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138 var funinfo = this.symbols.find(name);
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139 if (!funinfo || funinfo.def instanceof setter) {
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140 method = true;
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141 } else {
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142 switch(funinfo.type)
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143 {
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144 case 'self':
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145 if (args.length < funinfo.def.args.length || funinfo.def.args[0].name != 'self') {
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146 args.splice(0, 0, new symbol('self', this.symbols));
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147 } else {
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148 args.splice(0, 1);
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149 }
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150 method = true;
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151 break;
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152 case 'parent':
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153 ret = 'self';
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154 for (var i = 0; i < funinfo.depth; ++i) {
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155 ret += '->parent';
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156 }
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157 break;
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158 }
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159 }
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160 for (var i in args) {
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161 args[i] = 'params[' + i + '] = ' + args[i].toC() + ',\n';
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162 }
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163 var callpart;
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164 if (method) {
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165 callpart = 'mcall(' + getMethodId(name);
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166 } else {
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167 callpart = 'ccall(' + escapeCName(name);
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168 }
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169 return '(' + args.join('') + callpart + ', ' + args.length + ', ' + 'params))';
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170 }
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171
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172 function cObject(name) {
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173 this.name = name;
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174 this.slots = {};
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175 this.properties = [];
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176 this.values = [];
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177 }
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178
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179 cObject.prototype.addMessage = function(msgname, implementation) {
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180 var methodid = getMethodId(msgname);
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181 var trunc = methodid & 0xF;
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182 if (!(trunc in this.slots)) {
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183 this.slots[trunc] = [];
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184 }
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185 this.slots[trunc].push([methodid, implementation, msgname]);
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186 }
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187
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188 cObject.prototype.addProperty = function(propname, value, type) {
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189 if (type != undefined) {
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190 this.properties.push([propname, type]);
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191 } else {
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192 var escaped = escapeCName(propname);
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193 this.addMessage(propname, 'return self->' + escaped + ';');
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194 this.addMessage(propname + '!', 'self->' + escaped + ' = params[1]; return params[0];');
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195 this.properties.push(escaped);
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196 this.values.push(value);
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197 }
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198 }
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199
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200 cObject.prototype.toEarlyCDef = function() {
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201 var objdef = 'typedef struct {\n\tobject header;\n';
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202 for (var i in this.properties) {
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203 if (this.properties[i] instanceof Array) {
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204 objdef += '\t' + this.properties[i][1] + ' ' + this.properties[i][0] + ';\n';
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205 } else {
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206 objdef += '\tobject * ' + this.properties[i] + ';\n'
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207 }
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208 }
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209 objdef += '} ' + this.name + ';\nobj_meta ' + this.name + '_meta;\n';
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210 return objdef;
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211 }
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212
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213 cObject.prototype.toCDef = function() {
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214 var slotdefs = '';
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215 var metadef = 'obj_meta ' + this.name + '_meta = {sizeof(' + this.name +'), {';
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216 for (var i = 0; i < 16; i++) {
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217 if (i) {
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218 metadef += ', ';
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219 }
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220 if (i in this.slots) {
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221 slotdefs += 'object * ' + this.name + '_slot_' + i + '(uint32_t method_id, uint32_t num_params, object ** params) {\n\t' +
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222 this.name + ' *self = (' + this.name + ' *)params[0];';
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223 if (this.slots[i].length == 1) {
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224 slotdefs += '\tif (method_id == ' + this.slots[i][0][0] + ') { /* ' + this.slots[i][0][2] + '*/\n' +
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225 '\t\t' + this.slots[i][0][1] + '\n' +
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diff changeset
226 '\t}\n' +
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227 '\treturn no_impl(method_id, num_params, params);\n}\n';
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228 } else {
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229 slotdefs += '\tswitch(method_id) {\n';
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230 for (j in this.slots[i]) {
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231 slotdefs += '\t\tcase ' + this.slots[i][j][0] + ': /* ' + this.slots[i][j][2] + '*/\n' +
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232 '\t\t\t' + this.slots[i][j][1] + '\n';
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233 }
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234 slotdefs += '\t\tdefault:\n\treturn no_impl(method_id, num_params, params);\n}\n';
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235 }
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236 metadef += this.name + '_slot_' + i;
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237 } else {
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238 metadef += 'no_impl';
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239 }
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240 }
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241 metadef += '}};\n';
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diff changeset
242 return slotdefs + metadef;
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243 }
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244
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245 cObject.prototype.toCInstance = function() {
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246 return 'make_object(&' + this.name + '_meta, NULL, ' + this.values.length + (this.values.length ? ', ' : '') + this.values.join(', ') + ')';
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247 }
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248
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249 var nextobject = 0;
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diff changeset
250
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diff changeset
251 object.prototype.toC = function() {
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diff changeset
252 var messages = this.messages;
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253 var values = [];
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diff changeset
254 var imports = []
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diff changeset
255 var me = new cObject('object_' + nextobject++);
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diff changeset
256 for (var i in messages) {
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diff changeset
257 if (messages[i] instanceof funcall) {
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diff changeset
258 if (messages[i].name == 'import:' && messages[i].args.length == 1) {
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diff changeset
259 imports.push({symbols: false, src: messages[i].args[0]});
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diff changeset
260 } else if(messages[i].name == 'import:from:' && messages[i].args.length == 2) {
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diff changeset
261 var importsyms = [];
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diff changeset
262 each(messages[i].args[0].val, function(i, el) {
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diff changeset
263 if (!(el instanceof symbol)) {
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diff changeset
264 throw new Error('Names in import:from statement must be symbols');
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diff changeset
265 }
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diff changeset
266 importsyms.push(new strlit(el.name));
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267 });
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diff changeset
268 imports.push({symbols: new listlit(importsyms), src: messages[i].args[1]});
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diff changeset
269 } else {
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diff changeset
270 throw new Error('Only import and import:from calls allowed in object context');
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diff changeset
271 }
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diff changeset
272 } else {
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diff changeset
273 messages[i].toCObject(me);
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diff changeset
274 }
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diff changeset
275 }
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diff changeset
276 forwarddec += me.toEarlyCDef();
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diff changeset
277 toplevelcode += me.toCDef();
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diff changeset
278 return me.toCInstance();
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diff changeset
279 }
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diff changeset
280
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diff changeset
281 var toplevelcode;
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diff changeset
282 var forwarddec;
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diff changeset
283
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diff changeset
284 function makeCProg(obj)
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diff changeset
285 {
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diff changeset
286 var int32 = new cObject('obj_int32');
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diff changeset
287 int32.addProperty('num', null, 'int32_t');
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diff changeset
288 int32.addMessage('ADD_', 'params[0] = make_object(&obj_int32_meta, NULL, 0); ((obj_int32 *)params[0])->num = self->num + ((obj_int32 *)params[1])->num; return params[0];');
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diff changeset
289 int32.addMessage('SUB_', 'params[0] = make_object(&obj_int32_meta, NULL, 0); ((obj_int32 *)params[0])->num = self->num - ((obj_int32 *)params[1])->num; return params[0];');
34
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diff changeset
290 int32.addMessage('LT_', 'params[0] = main_module; if (self->num < ((obj_int32 *)params[1])->num) { return mcall(METHOD_ID_TRUE, 1, params); } return mcall(METHOD_ID_FALSE, 1, params);');
31
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diff changeset
291 forwarddec = toplevelcode = '';
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diff changeset
292 forwarddec += int32.toEarlyCDef();
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diff changeset
293 toplevelcode += int32.toCDef();
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diff changeset
294 obj.populateSymbols(toplevel);
34
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diff changeset
295 var rest = 'object * mainModule() {\n\tmain_module = ' + obj.toC() + ';\n\treturn main_module;\n}\n';
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diff changeset
296 return '#include "runtime/proghead.inc"\n' +
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diff changeset
297 '#define METHOD_ID_MAIN ' + getMethodId('main') + '\n' +
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diff changeset
298 '#define METHOD_ID_TRUE ' + getMethodId('true') + '\n' +
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diff changeset
299 '#define METHOD_ID_FALSE ' + getMethodId('false') + '\n' +
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diff changeset
300 forwarddec + toplevelcode + rest + '#include "runtime/progfoot.inc"\n';
31
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301 }
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diff changeset
302
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diff changeset
303 object.prototype.toCModule = function() {
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diff changeset
304 return makeCProg(this);
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diff changeset
305 }
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diff changeset
306
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parents:
diff changeset
307 var lambdanum = 0;
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parents:
diff changeset
308
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309 lambda.prototype.toC = function() {
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310 var args = this.args ? this.args.slice(0, this.args.length) : [];
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311 var exprs = this.expressions;
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312 var mynum = lambdanum++;
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313 if (Object.keys(this.symbols.closedover).length) {
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314 this.symbols.envtype = 'lambda_' + mynum + '_env';
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315 }
31
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316 if (this.selftype) {
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317 this.symbols.defineVar('self', this.selftype);
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318 if (args[0] && args[0].cleanName() == 'self') {
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319 args.splice(0, 1);
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320 }
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321 var offset = 1;
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322 } else {
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323 var offset = 0;
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324 }
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325 for (var i = 0; i < args.length; ++i) {
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326 var argname = args[i].toC();
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327
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328 args[i] = (argname.indexOf('->') < 0 ? '\tobject * ' : '\t') + argname + ' = params[' + (offset + i) + '];\n';
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329 }
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330 var compiled = []
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331 for (var i in exprs) {
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332 var js = exprs[i].toC();
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333 if (js) {
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334 compiled.push(indent(js));
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335 }
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336 }
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337 exprs = compiled;
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338 if (exprs.length) {
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339 exprs[exprs.length-1] = 'return ' + exprs[exprs.length-1] + ';';
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340 }
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341
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342 if (Object.keys(this.symbols.closedover).length) {
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343 forwarddec += 'typedef struct {\n';
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344 for (var varname in this.symbols.closedover) {
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345 forwarddec += '\tobject * ' + escapeCName(varname) + ';\n';
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346 }
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347 forwarddec += '} lambda_' + mynum + '_env;\n'
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348
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349 var myenvinit = '\tlambda_' + mynum + '_env * myenv = malloc(sizeof(lambda_' + mynum + '_env));\n';
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350 this.symbols.envtype = 'lambda_' + mynum + '_env';
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351 } else {
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352 var myenvinit = '';
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353 }
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354
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355 toplevelcode += 'object * lambda_' + mynum + ' (' + this.symbols.parentEnvType() + ' * env, uint32_t num_args, object ** params) {\n' + myenvinit;
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356 if (this.selftype) {
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357 var selfvar = (new symbol('self', this.symbols)).toC();
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358 if (selfvar == 'self') {
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359 toplevelcode += '\t' + this.selftype + ' * self = (' + this.selftype + ' *)params[0];\n';
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360 } else {
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361 toplevelcode += '\t' + selfvar + ' = (' + this.selftype + ' *)params[0];\n';
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362 }
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363
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364 }
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365 toplevelcode += args.join('') + exprs.join(';\n\t') + '\n}\n';
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366
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367 if (this.symbols.parentEnvType() != 'void') {
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368 if (this.symbols.passthruenv) {
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369 var envvar = 'env';
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370 } else {
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371 var envvar = 'myenv';
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372 }
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373 return 'make_closure(' + envvar + ', lambda_' + mynum + ')';
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374 } else {
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375 toplevelcode += 'closure lambda_obj_' + mynum + ' = {{&lambda_meta, NULL}, NULL, lambda_' + mynum + '};\n';
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376 return '((object *)&lambda_obj_' + mynum + ')';
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377 }
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378 };
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379 lambda.prototype.toCObject = function(typename) {
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380 this.selftype = typename;
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381 return this.toC();
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382 };
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383 lambda.prototype.toCModule = function() {
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384 return makeCProg(this);
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385 }
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386
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387 assignment.prototype.toC = function() {
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388 var existing = this.symbols.find(this.symbol.name);
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389 var prefix = '';
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390 if (!existing) {
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391 prefix = 'object * ';
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392 }
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393 var val = this.expression.toC();
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394 if (val === null) {
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395 return null;
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396 }
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397 return prefix + this.symbol.toC() + ' = ' + val;
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398 };
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399 assignment.prototype.toCObject = function(cobj) {
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400 if (this.expression.toCObject) {
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401 var val = this.expression.toCObject(cobj.name);
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402 } else {
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403 var val = this.expression.toC();
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404 }
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405 if (val === null) {
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406 return;
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407 }
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408 if (this.expression instanceof lambda) {
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409 cobj.addMessage(this.symbol.name, 'return ccall(' + val + ', num_params, params);');
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410 } else {
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411 cobj.addProperty(this.symbol.name, val);
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412 }
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413 };