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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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1276 context()->Plug(r0); | 1276 context()->Plug(r0); |
1277 break; | 1277 break; |
1278 } | 1278 } |
1279 | 1279 |
1280 case Variable::PARAMETER: | 1280 case Variable::PARAMETER: |
1281 case Variable::LOCAL: | 1281 case Variable::LOCAL: |
1282 case Variable::CONTEXT: { | 1282 case Variable::CONTEXT: { |
1283 Comment cmnt(masm_, var->IsContextSlot() | 1283 Comment cmnt(masm_, var->IsContextSlot() |
1284 ? "Context variable" | 1284 ? "Context variable" |
1285 : "Stack variable"); | 1285 : "Stack variable"); |
1286 if (var->binding_needs_init()) { | 1286 if (!var->binding_needs_init()) { |
1287 // var->scope() may be NULL when the proxy is located in eval code and | 1287 context()->Plug(var); |
1288 // refers to a potential outside binding. Currently those bindings are | 1288 } else { |
1289 // always looked up dynamically, i.e. in that case | 1289 // Let and const need a read barrier. |
1290 // var->location() == LOOKUP. | 1290 GetVar(r0, var); |
1291 // always holds. | 1291 __ CompareRoot(r0, Heap::kTheHoleValueRootIndex); |
1292 ASSERT(var->scope() != NULL); | 1292 if (var->mode() == LET || var->mode() == CONST_HARMONY) { |
1293 | 1293 // Throw a reference error when using an uninitialized let/const |
1294 // Check if the binding really needs an initialization check. The check | 1294 // binding in harmony mode. |
1295 // can be skipped in the following situation: we have a LET or CONST | 1295 Label done; |
1296 // binding in harmony mode, both the Variable and the VariableProxy have | 1296 __ b(ne, &done); |
1297 // the same declaration scope (i.e. they are both in global code, in the | 1297 __ mov(r0, Operand(var->name())); |
1298 // same function or in the same eval code) and the VariableProxy is in | 1298 __ push(r0); |
1299 // the source physically located after the initializer of the variable. | 1299 __ CallRuntime(Runtime::kThrowReferenceError, 1); |
1300 // | 1300 __ bind(&done); |
1301 // We cannot skip any initialization checks for CONST in non-harmony | 1301 } else { |
1302 // mode because const variables may be declared but never initialized: | 1302 // Uninitalized const bindings outside of harmony mode are unholed. |
1303 // if (false) { const x; }; var y = x; | 1303 ASSERT(var->mode() == CONST); |
1304 // | 1304 __ LoadRoot(r0, Heap::kUndefinedValueRootIndex, eq); |
1305 // The condition on the declaration scopes is a conservative check for | |
1306 // nested functions that access a binding and are called before the | |
1307 // binding is initialized: | |
1308 // function() { f(); let x = 1; function f() { x = 2; } } | |
1309 // | |
1310 // Check that we always have valid source position. | |
1311 ASSERT(var->initializer_position() != RelocInfo::kNoPosition); | |
1312 ASSERT(proxy->position() != RelocInfo::kNoPosition); | |
1313 bool skip_init_check = | |
1314 var->mode() != CONST && | |
1315 var->scope()->DeclarationScope() == scope()->DeclarationScope() && | |
1316 var->initializer_position() < proxy->position(); | |
1317 if (!skip_init_check) { | |
1318 // Let and const need a read barrier. | |
1319 GetVar(r0, var); | |
1320 __ CompareRoot(r0, Heap::kTheHoleValueRootIndex); | |
1321 if (var->mode() == LET || var->mode() == CONST_HARMONY) { | |
1322 // Throw a reference error when using an uninitialized let/const | |
1323 // binding in harmony mode. | |
1324 Label done; | |
1325 __ b(ne, &done); | |
1326 __ mov(r0, Operand(var->name())); | |
1327 __ push(r0); | |
1328 __ CallRuntime(Runtime::kThrowReferenceError, 1); | |
1329 __ bind(&done); | |
1330 } else { | |
1331 // Uninitalized const bindings outside of harmony mode are unholed. | |
1332 ASSERT(var->mode() == CONST); | |
1333 __ LoadRoot(r0, Heap::kUndefinedValueRootIndex, eq); | |
1334 } | |
1335 context()->Plug(r0); | |
1336 break; | |
1337 } | 1305 } |
| 1306 context()->Plug(r0); |
1338 } | 1307 } |
1339 context()->Plug(var); | |
1340 break; | 1308 break; |
1341 } | 1309 } |
1342 | 1310 |
1343 case Variable::LOOKUP: { | 1311 case Variable::LOOKUP: { |
1344 Label done, slow; | 1312 Label done, slow; |
1345 // Generate code for loading from variables potentially shadowed | 1313 // Generate code for loading from variables potentially shadowed |
1346 // by eval-introduced variables. | 1314 // by eval-introduced variables. |
1347 EmitDynamicLookupFastCase(var, NOT_INSIDE_TYPEOF, &slow, &done); | 1315 EmitDynamicLookupFastCase(var, NOT_INSIDE_TYPEOF, &slow, &done); |
1348 __ bind(&slow); | 1316 __ bind(&slow); |
1349 Comment cmnt(masm_, "Lookup variable"); | 1317 Comment cmnt(masm_, "Lookup variable"); |
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4381 *context_length = 0; | 4349 *context_length = 0; |
4382 return previous_; | 4350 return previous_; |
4383 } | 4351 } |
4384 | 4352 |
4385 | 4353 |
4386 #undef __ | 4354 #undef __ |
4387 | 4355 |
4388 } } // namespace v8::internal | 4356 } } // namespace v8::internal |
4389 | 4357 |
4390 #endif // V8_TARGET_ARCH_ARM | 4358 #endif // V8_TARGET_ARCH_ARM |
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