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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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1233 Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize(); | 1233 Handle<Code> ic = isolate()->builtins()->LoadIC_Initialize(); |
1234 __ call(ic, RelocInfo::CODE_TARGET_CONTEXT); | 1234 __ call(ic, RelocInfo::CODE_TARGET_CONTEXT); |
1235 context()->Plug(rax); | 1235 context()->Plug(rax); |
1236 break; | 1236 break; |
1237 } | 1237 } |
1238 | 1238 |
1239 case Variable::PARAMETER: | 1239 case Variable::PARAMETER: |
1240 case Variable::LOCAL: | 1240 case Variable::LOCAL: |
1241 case Variable::CONTEXT: { | 1241 case Variable::CONTEXT: { |
1242 Comment cmnt(masm_, var->IsContextSlot() ? "Context slot" : "Stack slot"); | 1242 Comment cmnt(masm_, var->IsContextSlot() ? "Context slot" : "Stack slot"); |
1243 if (var->binding_needs_init()) { | 1243 if (!var->binding_needs_init()) { |
1244 // var->scope() may be NULL when the proxy is located in eval code and | 1244 context()->Plug(var); |
1245 // refers to a potential outside binding. Currently those bindings are | 1245 } else { |
1246 // always looked up dynamically, i.e. in that case | 1246 // Let and const need a read barrier. |
1247 // var->location() == LOOKUP. | 1247 Label done; |
1248 // always holds. | 1248 GetVar(rax, var); |
1249 ASSERT(var->scope() != NULL); | 1249 __ CompareRoot(rax, Heap::kTheHoleValueRootIndex); |
1250 | 1250 __ j(not_equal, &done, Label::kNear); |
1251 // Check if the binding really needs an initialization check. The check | 1251 if (var->mode() == LET || var->mode() == CONST_HARMONY) { |
1252 // can be skipped in the following situation: we have a LET or CONST | 1252 // Throw a reference error when using an uninitialized let/const |
1253 // binding in harmony mode, both the Variable and the VariableProxy have | 1253 // binding in harmony mode. |
1254 // the same declaration scope (i.e. they are both in global code, in the | 1254 __ Push(var->name()); |
1255 // same function or in the same eval code) and the VariableProxy is in | 1255 __ CallRuntime(Runtime::kThrowReferenceError, 1); |
1256 // the source physically located after the initializer of the variable. | 1256 } else { |
1257 // | 1257 // Uninitalized const bindings outside of harmony mode are unholed. |
1258 // We cannot skip any initialization checks for CONST in non-harmony | 1258 ASSERT(var->mode() == CONST); |
1259 // mode because const variables may be declared but never initialized: | 1259 __ LoadRoot(rax, Heap::kUndefinedValueRootIndex); |
1260 // if (false) { const x; }; var y = x; | |
1261 // | |
1262 // The condition on the declaration scopes is a conservative check for | |
1263 // nested functions that access a binding and are called before the | |
1264 // binding is initialized: | |
1265 // function() { f(); let x = 1; function f() { x = 2; } } | |
1266 // | |
1267 // Check that we always have valid source position. | |
1268 ASSERT(var->initializer_position() != RelocInfo::kNoPosition); | |
1269 ASSERT(proxy->position() != RelocInfo::kNoPosition); | |
1270 bool skip_init_check = | |
1271 var->mode() != CONST && | |
1272 var->scope()->DeclarationScope() == scope()->DeclarationScope() && | |
1273 var->initializer_position() < proxy->position(); | |
1274 if (!skip_init_check) { | |
1275 // Let and const need a read barrier. | |
1276 Label done; | |
1277 GetVar(rax, var); | |
1278 __ CompareRoot(rax, Heap::kTheHoleValueRootIndex); | |
1279 __ j(not_equal, &done, Label::kNear); | |
1280 if (var->mode() == LET || var->mode() == CONST_HARMONY) { | |
1281 // Throw a reference error when using an uninitialized let/const | |
1282 // binding in harmony mode. | |
1283 __ Push(var->name()); | |
1284 __ CallRuntime(Runtime::kThrowReferenceError, 1); | |
1285 } else { | |
1286 // Uninitalized const bindings outside of harmony mode are unholed. | |
1287 ASSERT(var->mode() == CONST); | |
1288 __ LoadRoot(rax, Heap::kUndefinedValueRootIndex); | |
1289 } | |
1290 __ bind(&done); | |
1291 context()->Plug(rax); | |
1292 break; | |
1293 } | 1260 } |
| 1261 __ bind(&done); |
| 1262 context()->Plug(rax); |
1294 } | 1263 } |
1295 context()->Plug(var); | |
1296 break; | 1264 break; |
1297 } | 1265 } |
1298 | 1266 |
1299 case Variable::LOOKUP: { | 1267 case Variable::LOOKUP: { |
1300 Label done, slow; | 1268 Label done, slow; |
1301 // Generate code for loading from variables potentially shadowed | 1269 // Generate code for loading from variables potentially shadowed |
1302 // by eval-introduced variables. | 1270 // by eval-introduced variables. |
1303 EmitDynamicLookupFastCase(var, NOT_INSIDE_TYPEOF, &slow, &done); | 1271 EmitDynamicLookupFastCase(var, NOT_INSIDE_TYPEOF, &slow, &done); |
1304 __ bind(&slow); | 1272 __ bind(&slow); |
1305 Comment cmnt(masm_, "Lookup slot"); | 1273 Comment cmnt(masm_, "Lookup slot"); |
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4336 *context_length = 0; | 4304 *context_length = 0; |
4337 return previous_; | 4305 return previous_; |
4338 } | 4306 } |
4339 | 4307 |
4340 | 4308 |
4341 #undef __ | 4309 #undef __ |
4342 | 4310 |
4343 } } // namespace v8::internal | 4311 } } // namespace v8::internal |
4344 | 4312 |
4345 #endif // V8_TARGET_ARCH_X64 | 4313 #endif // V8_TARGET_ARCH_X64 |
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