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1 // Copyright 2010 the V8 project authors. All rights reserved. | 1 // Copyright 2010 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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62 | 62 |
63 | 63 |
64 // A debug break in the frame exit code is identified by the JS frame exit code | 64 // A debug break in the frame exit code is identified by the JS frame exit code |
65 // having been patched with a call instruction. | 65 // having been patched with a call instruction. |
66 bool Debug::IsDebugBreakAtReturn(RelocInfo* rinfo) { | 66 bool Debug::IsDebugBreakAtReturn(RelocInfo* rinfo) { |
67 ASSERT(RelocInfo::IsJSReturn(rinfo->rmode())); | 67 ASSERT(RelocInfo::IsJSReturn(rinfo->rmode())); |
68 return rinfo->IsPatchedReturnSequence(); | 68 return rinfo->IsPatchedReturnSequence(); |
69 } | 69 } |
70 | 70 |
71 | 71 |
| 72 bool BreakLocationIterator::IsDebugBreakAtSlot() { |
| 73 ASSERT(IsDebugBreakSlot()); |
| 74 // Check whether the debug break slot instructions have been patched. |
| 75 return rinfo()->IsPatchedDebugBreakSlotSequence(); |
| 76 } |
| 77 |
| 78 |
| 79 void BreakLocationIterator::SetDebugBreakAtSlot() { |
| 80 ASSERT(IsDebugBreakSlot()); |
| 81 rinfo()->PatchCodeWithCall( |
| 82 Debug::debug_break_slot()->entry(), |
| 83 Assembler::kDebugBreakSlotLength - Assembler::kCallInstructionLength); |
| 84 } |
| 85 |
| 86 |
| 87 void BreakLocationIterator::ClearDebugBreakAtSlot() { |
| 88 ASSERT(IsDebugBreakSlot()); |
| 89 rinfo()->PatchCode(original_rinfo()->pc(), Assembler::kDebugBreakSlotLength); |
| 90 } |
| 91 |
| 92 |
72 #define __ ACCESS_MASM(masm) | 93 #define __ ACCESS_MASM(masm) |
73 | 94 |
74 | 95 |
75 static void Generate_DebugBreakCallHelper(MacroAssembler* masm, | 96 static void Generate_DebugBreakCallHelper(MacroAssembler* masm, |
76 RegList pointer_regs, | 97 RegList pointer_regs, |
77 bool convert_call_to_jmp) { | 98 bool convert_call_to_jmp) { |
78 // Save the content of all general purpose registers in memory. This copy in | 99 // Save the content of all general purpose registers in memory. This copy in |
79 // memory is later pushed onto the JS expression stack for the fake JS frame | 100 // memory is later pushed onto the JS expression stack for the fake JS frame |
80 // generated and also to the C frame generated on top of that. In the JS | 101 // generated and also to the C frame generated on top of that. In the JS |
81 // frame ONLY the registers containing pointers will be pushed on the | 102 // frame ONLY the registers containing pointers will be pushed on the |
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201 | 222 |
202 void Debug::GenerateStubNoRegistersDebugBreak(MacroAssembler* masm) { | 223 void Debug::GenerateStubNoRegistersDebugBreak(MacroAssembler* masm) { |
203 // Register state for stub CallFunction (from CallFunctionStub in ic-ia32.cc). | 224 // Register state for stub CallFunction (from CallFunctionStub in ic-ia32.cc). |
204 // ----------- S t a t e ------------- | 225 // ----------- S t a t e ------------- |
205 // No registers used on entry. | 226 // No registers used on entry. |
206 // ----------------------------------- | 227 // ----------------------------------- |
207 Generate_DebugBreakCallHelper(masm, 0, false); | 228 Generate_DebugBreakCallHelper(masm, 0, false); |
208 } | 229 } |
209 | 230 |
210 | 231 |
| 232 void Debug::GenerateSlot(MacroAssembler* masm) { |
| 233 // Generate enough nop's to make space for a call instruction. |
| 234 Label check_codesize; |
| 235 __ bind(&check_codesize); |
| 236 __ RecordDebugBreakSlot(); |
| 237 for (int i = 0; i < Assembler::kDebugBreakSlotLength; i++) { |
| 238 __ nop(); |
| 239 } |
| 240 ASSERT_EQ(Assembler::kDebugBreakSlotLength, |
| 241 masm->SizeOfCodeGeneratedSince(&check_codesize)); |
| 242 } |
| 243 |
| 244 |
| 245 void Debug::GenerateSlotDebugBreak(MacroAssembler* masm) { |
| 246 // In the places where a debug break slot is inserted no registers can contain |
| 247 // object pointers. |
| 248 Generate_DebugBreakCallHelper(masm, 0, true); |
| 249 } |
| 250 |
| 251 |
211 void Debug::GeneratePlainReturnLiveEdit(MacroAssembler* masm) { | 252 void Debug::GeneratePlainReturnLiveEdit(MacroAssembler* masm) { |
212 masm->ret(0); | 253 masm->ret(0); |
213 } | 254 } |
214 | 255 |
| 256 |
215 // FrameDropper is a code replacement for a JavaScript frame with possibly | 257 // FrameDropper is a code replacement for a JavaScript frame with possibly |
216 // several frames above. | 258 // several frames above. |
217 // There is no calling conventions here, because it never actually gets called, | 259 // There is no calling conventions here, because it never actually gets called, |
218 // it only gets returned to. | 260 // it only gets returned to. |
219 // Frame structure (conforms InternalFrame structure): | 261 // Frame structure (conforms InternalFrame structure): |
220 // -- JSFunction | 262 // -- JSFunction |
221 // -- code | 263 // -- code |
222 // -- SMI maker | 264 // -- SMI maker |
223 // -- context | 265 // -- context |
224 // -- frame base | 266 // -- frame base |
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258 Memory::Object_at(fp - 2 * kPointerSize) = Smi::FromInt(StackFrame::INTERNAL); | 300 Memory::Object_at(fp - 2 * kPointerSize) = Smi::FromInt(StackFrame::INTERNAL); |
259 } | 301 } |
260 const int Debug::kFrameDropperFrameSize = 5; | 302 const int Debug::kFrameDropperFrameSize = 5; |
261 | 303 |
262 | 304 |
263 #endif // ENABLE_DEBUGGER_SUPPORT | 305 #endif // ENABLE_DEBUGGER_SUPPORT |
264 | 306 |
265 } } // namespace v8::internal | 307 } } // namespace v8::internal |
266 | 308 |
267 #endif // V8_TARGET_ARCH_IA32 | 309 #endif // V8_TARGET_ARCH_IA32 |
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