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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 #include "v8.h" | 5 #include "v8.h" |
6 | 6 |
7 #if V8_TARGET_ARCH_IA32 | 7 #if V8_TARGET_ARCH_IA32 |
8 | 8 |
9 #include "codegen.h" | 9 #include "codegen.h" |
10 #include "deoptimizer.h" | 10 #include "deoptimizer.h" |
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60 int additional_comments = | 60 int additional_comments = |
61 (min_padding + comment_reloc_size - 1) / comment_reloc_size; | 61 (min_padding + comment_reloc_size - 1) / comment_reloc_size; |
62 // Actual padding size. | 62 // Actual padding size. |
63 int padding = additional_comments * comment_reloc_size; | 63 int padding = additional_comments * comment_reloc_size; |
64 // Allocate new relocation info and copy old relocation to the end | 64 // Allocate new relocation info and copy old relocation to the end |
65 // of the new relocation info array because relocation info is | 65 // of the new relocation info array because relocation info is |
66 // written and read backwards. | 66 // written and read backwards. |
67 Factory* factory = isolate->factory(); | 67 Factory* factory = isolate->factory(); |
68 Handle<ByteArray> new_reloc = | 68 Handle<ByteArray> new_reloc = |
69 factory->NewByteArray(reloc_length + padding, TENURED); | 69 factory->NewByteArray(reloc_length + padding, TENURED); |
70 OS::MemCopy(new_reloc->GetDataStartAddress() + padding, | 70 MemCopy(new_reloc->GetDataStartAddress() + padding, |
71 code->relocation_info()->GetDataStartAddress(), | 71 code->relocation_info()->GetDataStartAddress(), reloc_length); |
72 reloc_length); | |
73 // Create a relocation writer to write the comments in the padding | 72 // Create a relocation writer to write the comments in the padding |
74 // space. Use position 0 for everything to ensure short encoding. | 73 // space. Use position 0 for everything to ensure short encoding. |
75 RelocInfoWriter reloc_info_writer( | 74 RelocInfoWriter reloc_info_writer( |
76 new_reloc->GetDataStartAddress() + padding, 0); | 75 new_reloc->GetDataStartAddress() + padding, 0); |
77 intptr_t comment_string | 76 intptr_t comment_string |
78 = reinterpret_cast<intptr_t>(RelocInfo::kFillerCommentString); | 77 = reinterpret_cast<intptr_t>(RelocInfo::kFillerCommentString); |
79 RelocInfo rinfo(0, RelocInfo::COMMENT, comment_string, NULL); | 78 RelocInfo rinfo(0, RelocInfo::COMMENT, comment_string, NULL); |
80 for (int i = 0; i < additional_comments; ++i) { | 79 for (int i = 0; i < additional_comments; ++i) { |
81 #ifdef DEBUG | 80 #ifdef DEBUG |
82 byte* pos_before = reloc_info_writer.pos(); | 81 byte* pos_before = reloc_info_writer.pos(); |
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155 ASSERT(prev_call_address == NULL || | 154 ASSERT(prev_call_address == NULL || |
156 call_address >= prev_call_address + patch_size()); | 155 call_address >= prev_call_address + patch_size()); |
157 ASSERT(call_address + patch_size() <= code->instruction_end()); | 156 ASSERT(call_address + patch_size() <= code->instruction_end()); |
158 #ifdef DEBUG | 157 #ifdef DEBUG |
159 prev_call_address = call_address; | 158 prev_call_address = call_address; |
160 #endif | 159 #endif |
161 } | 160 } |
162 | 161 |
163 // Move the relocation info to the beginning of the byte array. | 162 // Move the relocation info to the beginning of the byte array. |
164 int new_reloc_size = reloc_end_address - reloc_info_writer.pos(); | 163 int new_reloc_size = reloc_end_address - reloc_info_writer.pos(); |
165 OS::MemMove( | 164 MemMove(code->relocation_start(), reloc_info_writer.pos(), new_reloc_size); |
166 code->relocation_start(), reloc_info_writer.pos(), new_reloc_size); | |
167 | 165 |
168 // The relocation info is in place, update the size. | 166 // The relocation info is in place, update the size. |
169 reloc_info->set_length(new_reloc_size); | 167 reloc_info->set_length(new_reloc_size); |
170 | 168 |
171 // Handle the junk part after the new relocation info. We will create | 169 // Handle the junk part after the new relocation info. We will create |
172 // a non-live object in the extra space at the end of the former reloc info. | 170 // a non-live object in the extra space at the end of the former reloc info. |
173 Address junk_address = reloc_info->address() + reloc_info->Size(); | 171 Address junk_address = reloc_info->address() + reloc_info->Size(); |
174 ASSERT(junk_address <= reloc_end_address); | 172 ASSERT(junk_address <= reloc_end_address); |
175 isolate->heap()->CreateFillerObjectAt(junk_address, | 173 isolate->heap()->CreateFillerObjectAt(junk_address, |
176 reloc_end_address - junk_address); | 174 reloc_end_address - junk_address); |
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428 UNREACHABLE(); | 426 UNREACHABLE(); |
429 } | 427 } |
430 | 428 |
431 | 429 |
432 #undef __ | 430 #undef __ |
433 | 431 |
434 | 432 |
435 } } // namespace v8::internal | 433 } } // namespace v8::internal |
436 | 434 |
437 #endif // V8_TARGET_ARCH_IA32 | 435 #endif // V8_TARGET_ARCH_IA32 |
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