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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 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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30 #include "codegen-inl.h" | 30 #include "codegen-inl.h" |
31 #include "debug.h" | 31 #include "debug.h" |
32 | 32 |
33 | 33 |
34 namespace v8 { namespace internal { | 34 namespace v8 { namespace internal { |
35 | 35 |
36 | 36 |
37 // A debug break in the frame exit code is identified by a call instruction. | 37 // A debug break in the frame exit code is identified by a call instruction. |
38 bool BreakLocationIterator::IsDebugBreakAtReturn() { | 38 bool BreakLocationIterator::IsDebugBreakAtReturn() { |
39 // Opcode E8 is call. | 39 // Opcode E8 is call. |
40 return (*(rinfo()->pc()) == 0xE8); | 40 return Debug::IsDebugBreakAtReturn(rinfo()); |
41 } | 41 } |
42 | 42 |
43 | 43 |
44 // Patch the JS frame exit code with a debug break call. See | 44 // Patch the JS frame exit code with a debug break call. See |
45 // CodeGenerator::VisitReturnStatement and VirtualFrame::Exit in codegen-ia32.cc | 45 // CodeGenerator::VisitReturnStatement and VirtualFrame::Exit in codegen-ia32.cc |
46 // for the precise return instructions sequence. | 46 // for the precise return instructions sequence. |
47 void BreakLocationIterator::SetDebugBreakAtReturn() { | 47 void BreakLocationIterator::SetDebugBreakAtReturn() { |
48 ASSERT(Debug::kIa32JSReturnSequenceLength >= | 48 ASSERT(Debug::kIa32JSReturnSequenceLength >= |
49 Debug::kIa32CallInstructionLength); | 49 Debug::kIa32CallInstructionLength); |
50 rinfo()->PatchCodeWithCall(Debug::debug_break_return_entry()->entry(), | 50 rinfo()->PatchCodeWithCall(Debug::debug_break_return_entry()->entry(), |
51 Debug::kIa32JSReturnSequenceLength - Debug::kIa32CallInstructionLength); | 51 Debug::kIa32JSReturnSequenceLength - Debug::kIa32CallInstructionLength); |
52 } | 52 } |
53 | 53 |
54 | 54 |
55 // Restore the JS frame exit code. | 55 // Restore the JS frame exit code. |
56 void BreakLocationIterator::ClearDebugBreakAtReturn() { | 56 void BreakLocationIterator::ClearDebugBreakAtReturn() { |
57 rinfo()->PatchCode(original_rinfo()->pc(), | 57 rinfo()->PatchCode(original_rinfo()->pc(), |
58 Debug::kIa32JSReturnSequenceLength); | 58 Debug::kIa32JSReturnSequenceLength); |
59 } | 59 } |
60 | 60 |
61 | 61 |
| 62 // Check whether the JS frame exit code has been patched with a debug break. |
| 63 bool Debug::IsDebugBreakAtReturn(RelocInfo* rinfo) { |
| 64 ASSERT(RelocInfo::IsJSReturn(rinfo->rmode())); |
| 65 // Opcode E8 is call. |
| 66 return (*(rinfo->pc()) == 0xE8); |
| 67 } |
| 68 |
| 69 |
62 #define __ masm-> | 70 #define __ masm-> |
63 | 71 |
64 | 72 |
65 static void Generate_DebugBreakCallHelper(MacroAssembler* masm, | 73 static void Generate_DebugBreakCallHelper(MacroAssembler* masm, |
66 RegList pointer_regs, | 74 RegList pointer_regs, |
67 bool convert_call_to_jmp) { | 75 bool convert_call_to_jmp) { |
68 // Save the content of all general purpose registers in memory. This copy in | 76 // Save the content of all general purpose registers in memory. This copy in |
69 // memory is later pushed onto the JS expression stack for the fake JS frame | 77 // memory is later pushed onto the JS expression stack for the fake JS frame |
70 // generated and also to the C frame generated on top of that. In the JS | 78 // generated and also to the C frame generated on top of that. In the JS |
71 // frame ONLY the registers containing pointers will be pushed on the | 79 // frame ONLY the registers containing pointers will be pushed on the |
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201 // No registers used on entry. | 209 // No registers used on entry. |
202 // ----------------------------------- | 210 // ----------------------------------- |
203 Generate_DebugBreakCallHelper(masm, 0, false); | 211 Generate_DebugBreakCallHelper(masm, 0, false); |
204 } | 212 } |
205 | 213 |
206 | 214 |
207 #undef __ | 215 #undef __ |
208 | 216 |
209 | 217 |
210 } } // namespace v8::internal | 218 } } // namespace v8::internal |
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