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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #if V8_TARGET_ARCH_IA32 | 5 #if V8_TARGET_ARCH_IA32 |
6 | 6 |
7 #include "src/base/bits.h" | 7 #include "src/base/bits.h" |
8 #include "src/base/division-by-constant.h" | 8 #include "src/base/division-by-constant.h" |
9 #include "src/bootstrapper.h" | 9 #include "src/bootstrapper.h" |
10 #include "src/codegen.h" | 10 #include "src/codegen.h" |
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1275 | 1275 |
1276 | 1276 |
1277 void MacroAssembler::PopStackHandler() { | 1277 void MacroAssembler::PopStackHandler() { |
1278 STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0); | 1278 STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0); |
1279 ExternalReference handler_address(Isolate::kHandlerAddress, isolate()); | 1279 ExternalReference handler_address(Isolate::kHandlerAddress, isolate()); |
1280 pop(Operand::StaticVariable(handler_address)); | 1280 pop(Operand::StaticVariable(handler_address)); |
1281 add(esp, Immediate(StackHandlerConstants::kSize - kPointerSize)); | 1281 add(esp, Immediate(StackHandlerConstants::kSize - kPointerSize)); |
1282 } | 1282 } |
1283 | 1283 |
1284 | 1284 |
1285 void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg, | |
1286 Register scratch1, | |
1287 Register scratch2, | |
1288 Label* miss) { | |
1289 Label same_contexts; | |
1290 | |
1291 DCHECK(!holder_reg.is(scratch1)); | |
1292 DCHECK(!holder_reg.is(scratch2)); | |
1293 DCHECK(!scratch1.is(scratch2)); | |
1294 | |
1295 // Load current lexical context from the active StandardFrame, which | |
1296 // may require crawling past STUB frames. | |
1297 Label load_context; | |
1298 Label has_context; | |
1299 mov(scratch2, ebp); | |
1300 bind(&load_context); | |
1301 mov(scratch1, | |
1302 MemOperand(scratch2, CommonFrameConstants::kContextOrFrameTypeOffset)); | |
1303 JumpIfNotSmi(scratch1, &has_context); | |
1304 mov(scratch2, MemOperand(scratch2, CommonFrameConstants::kCallerFPOffset)); | |
1305 jmp(&load_context); | |
1306 bind(&has_context); | |
1307 | |
1308 // When generating debug code, make sure the lexical context is set. | |
1309 if (emit_debug_code()) { | |
1310 cmp(scratch1, Immediate(0)); | |
1311 Check(not_equal, kWeShouldNotHaveAnEmptyLexicalContext); | |
1312 } | |
1313 // Load the native context of the current context. | |
1314 mov(scratch1, ContextOperand(scratch1, Context::NATIVE_CONTEXT_INDEX)); | |
1315 | |
1316 // Check the context is a native context. | |
1317 if (emit_debug_code()) { | |
1318 // Read the first word and compare to native_context_map. | |
1319 cmp(FieldOperand(scratch1, HeapObject::kMapOffset), | |
1320 isolate()->factory()->native_context_map()); | |
1321 Check(equal, kJSGlobalObjectNativeContextShouldBeANativeContext); | |
1322 } | |
1323 | |
1324 // Check if both contexts are the same. | |
1325 cmp(scratch1, FieldOperand(holder_reg, JSGlobalProxy::kNativeContextOffset)); | |
1326 j(equal, &same_contexts); | |
1327 | |
1328 // Compare security tokens, save holder_reg on the stack so we can use it | |
1329 // as a temporary register. | |
1330 // | |
1331 // Check that the security token in the calling global object is | |
1332 // compatible with the security token in the receiving global | |
1333 // object. | |
1334 mov(scratch2, | |
1335 FieldOperand(holder_reg, JSGlobalProxy::kNativeContextOffset)); | |
1336 | |
1337 // Check the context is a native context. | |
1338 if (emit_debug_code()) { | |
1339 cmp(scratch2, isolate()->factory()->null_value()); | |
1340 Check(not_equal, kJSGlobalProxyContextShouldNotBeNull); | |
1341 | |
1342 // Read the first word and compare to native_context_map(), | |
1343 cmp(FieldOperand(scratch2, HeapObject::kMapOffset), | |
1344 isolate()->factory()->native_context_map()); | |
1345 Check(equal, kJSGlobalObjectNativeContextShouldBeANativeContext); | |
1346 } | |
1347 | |
1348 int token_offset = Context::kHeaderSize + | |
1349 Context::SECURITY_TOKEN_INDEX * kPointerSize; | |
1350 mov(scratch1, FieldOperand(scratch1, token_offset)); | |
1351 cmp(scratch1, FieldOperand(scratch2, token_offset)); | |
1352 j(not_equal, miss); | |
1353 | |
1354 bind(&same_contexts); | |
1355 } | |
1356 | |
1357 | |
1358 // Compute the hash code from the untagged key. This must be kept in sync with | 1285 // Compute the hash code from the untagged key. This must be kept in sync with |
1359 // ComputeIntegerHash in utils.h and KeyedLoadGenericStub in | 1286 // ComputeIntegerHash in utils.h and KeyedLoadGenericStub in |
1360 // code-stub-hydrogen.cc | 1287 // code-stub-hydrogen.cc |
1361 // | 1288 // |
1362 // Note: r0 will contain hash code | 1289 // Note: r0 will contain hash code |
1363 void MacroAssembler::GetNumberHash(Register r0, Register scratch) { | 1290 void MacroAssembler::GetNumberHash(Register r0, Register scratch) { |
1364 // Xor original key with a seed. | 1291 // Xor original key with a seed. |
1365 if (serializer_enabled()) { | 1292 if (serializer_enabled()) { |
1366 ExternalReference roots_array_start = | 1293 ExternalReference roots_array_start = |
1367 ExternalReference::roots_array_start(isolate()); | 1294 ExternalReference::roots_array_start(isolate()); |
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3285 mov(eax, dividend); | 3212 mov(eax, dividend); |
3286 shr(eax, 31); | 3213 shr(eax, 31); |
3287 add(edx, eax); | 3214 add(edx, eax); |
3288 } | 3215 } |
3289 | 3216 |
3290 | 3217 |
3291 } // namespace internal | 3218 } // namespace internal |
3292 } // namespace v8 | 3219 } // namespace v8 |
3293 | 3220 |
3294 #endif // V8_TARGET_ARCH_IA32 | 3221 #endif // V8_TARGET_ARCH_IA32 |
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