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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #include "vm/globals.h" | 5 #include "vm/globals.h" |
6 #if defined(TARGET_ARCH_IA32) | 6 #if defined(TARGET_ARCH_IA32) |
7 | 7 |
8 #include "vm/assembler.h" | 8 #include "vm/assembler.h" |
9 #include "vm/assembler_macros.h" | 9 #include "vm/assembler_macros.h" |
10 #include "vm/compiler.h" | 10 #include "vm/compiler.h" |
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1107 // ESP : points to return address. | 1107 // ESP : points to return address. |
1108 // Uses EAX, EBX, ECX, EDX, EDI as temporary registers. | 1108 // Uses EAX, EBX, ECX, EDX, EDI as temporary registers. |
1109 void StubCode::GenerateAllocationStubForClass(Assembler* assembler, | 1109 void StubCode::GenerateAllocationStubForClass(Assembler* assembler, |
1110 const Class& cls) { | 1110 const Class& cls) { |
1111 const intptr_t kObjectTypeArgumentsOffset = 2 * kWordSize; | 1111 const intptr_t kObjectTypeArgumentsOffset = 2 * kWordSize; |
1112 const intptr_t kInstantiatorTypeArgumentsOffset = 1 * kWordSize; | 1112 const intptr_t kInstantiatorTypeArgumentsOffset = 1 * kWordSize; |
1113 const Immediate raw_null = | 1113 const Immediate raw_null = |
1114 Immediate(reinterpret_cast<intptr_t>(Object::null())); | 1114 Immediate(reinterpret_cast<intptr_t>(Object::null())); |
1115 // The generated code is different if the class is parameterized. | 1115 // The generated code is different if the class is parameterized. |
1116 const bool is_cls_parameterized = | 1116 const bool is_cls_parameterized = |
1117 cls.type_arguments_instance_field_offset() != Class::kNoTypeArguments; | 1117 cls.type_arguments_field_offset() != Class::kNoTypeArguments; |
1118 // kInlineInstanceSize is a constant used as a threshold for determining | 1118 // kInlineInstanceSize is a constant used as a threshold for determining |
1119 // when the object initialization should be done as a loop or as | 1119 // when the object initialization should be done as a loop or as |
1120 // straight line code. | 1120 // straight line code. |
1121 const int kInlineInstanceSize = 12; | 1121 const int kInlineInstanceSize = 12; |
1122 const intptr_t instance_size = cls.instance_size(); | 1122 const intptr_t instance_size = cls.instance_size(); |
1123 ASSERT(instance_size > 0); | 1123 ASSERT(instance_size > 0); |
1124 const intptr_t type_args_size = InstantiatedTypeArguments::InstanceSize(); | 1124 const intptr_t type_args_size = InstantiatedTypeArguments::InstanceSize(); |
1125 if (FLAG_inline_alloc && | 1125 if (FLAG_inline_alloc && |
1126 PageSpace::IsPageAllocatableSize(instance_size + type_args_size)) { | 1126 PageSpace::IsPageAllocatableSize(instance_size + type_args_size)) { |
1127 Label slow_case; | 1127 Label slow_case; |
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1232 __ cmpl(ECX, EBX); | 1232 __ cmpl(ECX, EBX); |
1233 __ j(ABOVE_EQUAL, &done, Assembler::kNearJump); | 1233 __ j(ABOVE_EQUAL, &done, Assembler::kNearJump); |
1234 __ movl(Address(ECX, 0), raw_null); | 1234 __ movl(Address(ECX, 0), raw_null); |
1235 __ addl(ECX, Immediate(kWordSize)); | 1235 __ addl(ECX, Immediate(kWordSize)); |
1236 __ jmp(&init_loop, Assembler::kNearJump); | 1236 __ jmp(&init_loop, Assembler::kNearJump); |
1237 __ Bind(&done); | 1237 __ Bind(&done); |
1238 } | 1238 } |
1239 if (is_cls_parameterized) { | 1239 if (is_cls_parameterized) { |
1240 // EDI: new object type arguments. | 1240 // EDI: new object type arguments. |
1241 // Set the type arguments in the new object. | 1241 // Set the type arguments in the new object. |
1242 __ movl(Address(EAX, cls.type_arguments_instance_field_offset()), EDI); | 1242 __ movl(Address(EAX, cls.type_arguments_field_offset()), EDI); |
1243 } | 1243 } |
1244 // Done allocating and initializing the instance. | 1244 // Done allocating and initializing the instance. |
1245 // EAX: new object. | 1245 // EAX: new object. |
1246 __ addl(EAX, Immediate(kHeapObjectTag)); | 1246 __ addl(EAX, Immediate(kHeapObjectTag)); |
1247 __ ret(); | 1247 __ ret(); |
1248 | 1248 |
1249 __ Bind(&slow_case); | 1249 __ Bind(&slow_case); |
1250 } | 1250 } |
1251 if (is_cls_parameterized) { | 1251 if (is_cls_parameterized) { |
1252 __ movl(EAX, Address(ESP, kObjectTypeArgumentsOffset)); | 1252 __ movl(EAX, Address(ESP, kObjectTypeArgumentsOffset)); |
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1874 const Immediate raw_null = | 1874 const Immediate raw_null = |
1875 Immediate(reinterpret_cast<intptr_t>(Object::null())); | 1875 Immediate(reinterpret_cast<intptr_t>(Object::null())); |
1876 __ movl(EAX, Address(ESP, kInstanceOffsetInBytes)); | 1876 __ movl(EAX, Address(ESP, kInstanceOffsetInBytes)); |
1877 if (n > 1) { | 1877 if (n > 1) { |
1878 // Get instance type arguments. | 1878 // Get instance type arguments. |
1879 __ LoadClass(ECX, EAX, EBX); | 1879 __ LoadClass(ECX, EAX, EBX); |
1880 // Compute instance type arguments into EBX. | 1880 // Compute instance type arguments into EBX. |
1881 Label has_no_type_arguments; | 1881 Label has_no_type_arguments; |
1882 __ movl(EBX, raw_null); | 1882 __ movl(EBX, raw_null); |
1883 __ movl(EDI, FieldAddress(ECX, | 1883 __ movl(EDI, FieldAddress(ECX, |
1884 Class::type_arguments_instance_field_offset_offset())); | 1884 Class::type_arguments_field_offset_offset())); |
1885 __ cmpl(EDI, Immediate(Class::kNoTypeArguments)); | 1885 __ cmpl(EDI, Immediate(Class::kNoTypeArguments)); |
1886 __ j(EQUAL, &has_no_type_arguments, Assembler::kNearJump); | 1886 __ j(EQUAL, &has_no_type_arguments, Assembler::kNearJump); |
1887 __ movl(EBX, FieldAddress(EAX, EDI, TIMES_1, 0)); | 1887 __ movl(EBX, FieldAddress(EAX, EDI, TIMES_1, 0)); |
1888 __ Bind(&has_no_type_arguments); | 1888 __ Bind(&has_no_type_arguments); |
1889 } | 1889 } |
1890 __ LoadClassId(ECX, EAX); | 1890 __ LoadClassId(ECX, EAX); |
1891 // EAX: instance, ECX: instance class id. | 1891 // EAX: instance, ECX: instance class id. |
1892 // EBX: instance type arguments (null if none), used only if n > 1. | 1892 // EBX: instance type arguments (null if none), used only if n > 1. |
1893 __ movl(EDX, Address(ESP, kCacheOffsetInBytes)); | 1893 __ movl(EDX, Address(ESP, kCacheOffsetInBytes)); |
1894 // EDX: SubtypeTestCache. | 1894 // EDX: SubtypeTestCache. |
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2212 __ Bind(&done); | 2212 __ Bind(&done); |
2213 __ popl(temp); | 2213 __ popl(temp); |
2214 __ popl(right); | 2214 __ popl(right); |
2215 __ popl(left); | 2215 __ popl(left); |
2216 __ ret(); | 2216 __ ret(); |
2217 } | 2217 } |
2218 | 2218 |
2219 } // namespace dart | 2219 } // namespace dart |
2220 | 2220 |
2221 #endif // defined TARGET_ARCH_IA32 | 2221 #endif // defined TARGET_ARCH_IA32 |
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