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| 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | |
| 2 // Redistribution and use in source and binary forms, with or without | |
| 3 // modification, are permitted provided that the following conditions are | |
| 4 // met: | |
| 5 // | |
| 6 // * Redistributions of source code must retain the above copyright | |
| 7 // notice, this list of conditions and the following disclaimer. | |
| 8 // * Redistributions in binary form must reproduce the above | |
| 9 // copyright notice, this list of conditions and the following | |
| 10 // disclaimer in the documentation and/or other materials provided | |
| 11 // with the distribution. | |
| 12 // * Neither the name of Google Inc. nor the names of its | |
| 13 // contributors may be used to endorse or promote products derived | |
| 14 // from this software without specific prior written permission. | |
| 15 // | |
| 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 27 | |
| 28 #include "v8.h" | |
| 29 | |
| 30 #include "codegen-inl.h" | |
| 31 #include "debug.h" | |
| 32 | |
| 33 | |
| 34 namespace v8 { namespace internal { | |
| 35 | |
| 36 #ifdef ENABLE_DEBUGGER_SUPPORT | |
| 37 | |
| 38 // A debug break in the frame exit code is identified by a call instruction. | |
| 39 bool BreakLocationIterator::IsDebugBreakAtReturn() { | |
| 40 // Opcode E8 is call. | |
| 41 return Debug::IsDebugBreakAtReturn(rinfo()); | |
| 42 } | |
| 43 | |
| 44 | |
| 45 // Patch the JS frame exit code with a debug break call. See | |
| 46 // CodeGenerator::VisitReturnStatement and VirtualFrame::Exit in codegen-ia32.cc | |
| 47 // for the precise return instructions sequence. | |
| 48 void BreakLocationIterator::SetDebugBreakAtReturn() { | |
| 49 ASSERT(Debug::kIa32JSReturnSequenceLength >= | |
| 50 Debug::kIa32CallInstructionLength); | |
| 51 rinfo()->PatchCodeWithCall(Debug::debug_break_return_entry()->entry(), | |
| 52 Debug::kIa32JSReturnSequenceLength - Debug::kIa32CallInstructionLength); | |
| 53 } | |
| 54 | |
| 55 | |
| 56 // Restore the JS frame exit code. | |
| 57 void BreakLocationIterator::ClearDebugBreakAtReturn() { | |
| 58 rinfo()->PatchCode(original_rinfo()->pc(), | |
| 59 Debug::kIa32JSReturnSequenceLength); | |
| 60 } | |
| 61 | |
| 62 | |
| 63 // Check whether the JS frame exit code has been patched with a debug break. | |
| 64 bool Debug::IsDebugBreakAtReturn(RelocInfo* rinfo) { | |
| 65 ASSERT(RelocInfo::IsJSReturn(rinfo->rmode())); | |
| 66 // Opcode E8 is call. | |
| 67 return (*(rinfo->pc()) == 0xE8); | |
| 68 } | |
| 69 | |
| 70 | |
| 71 #define __ ACCESS_MASM(masm) | |
| 72 | |
| 73 | |
| 74 static void Generate_DebugBreakCallHelper(MacroAssembler* masm, | |
| 75 RegList pointer_regs, | |
| 76 bool convert_call_to_jmp) { | |
| 77 // Save the content of all general purpose registers in memory. This copy in | |
| 78 // memory is later pushed onto the JS expression stack for the fake JS frame | |
| 79 // generated and also to the C frame generated on top of that. In the JS | |
| 80 // frame ONLY the registers containing pointers will be pushed on the | |
| 81 // expression stack. This causes the GC to update these pointers so that | |
| 82 // they will have the correct value when returning from the debugger. | |
| 83 __ SaveRegistersToMemory(kJSCallerSaved); | |
| 84 | |
| 85 // Enter an internal frame. | |
| 86 __ EnterInternalFrame(); | |
| 87 | |
| 88 // Store the registers containing object pointers on the expression stack to | |
| 89 // make sure that these are correctly updated during GC. | |
| 90 __ PushRegistersFromMemory(pointer_regs); | |
| 91 | |
| 92 #ifdef DEBUG | |
| 93 __ RecordComment("// Calling from debug break to runtime - come in - over"); | |
| 94 #endif | |
| 95 __ Set(eax, Immediate(0)); // no arguments | |
| 96 __ mov(ebx, Immediate(ExternalReference::debug_break())); | |
| 97 | |
| 98 CEntryDebugBreakStub ceb; | |
| 99 __ CallStub(&ceb); | |
| 100 | |
| 101 // Restore the register values containing object pointers from the expression | |
| 102 // stack in the reverse order as they where pushed. | |
| 103 __ PopRegistersToMemory(pointer_regs); | |
| 104 | |
| 105 // Get rid of the internal frame. | |
| 106 __ LeaveInternalFrame(); | |
| 107 | |
| 108 // If this call did not replace a call but patched other code then there will | |
| 109 // be an unwanted return address left on the stack. Here we get rid of that. | |
| 110 if (convert_call_to_jmp) { | |
| 111 __ pop(eax); | |
| 112 } | |
| 113 | |
| 114 // Finally restore all registers. | |
| 115 __ RestoreRegistersFromMemory(kJSCallerSaved); | |
| 116 | |
| 117 // Now that the break point has been handled, resume normal execution by | |
| 118 // jumping to the target address intended by the caller and that was | |
| 119 // overwritten by the address of DebugBreakXXX. | |
| 120 ExternalReference after_break_target = | |
| 121 ExternalReference(Debug_Address::AfterBreakTarget()); | |
| 122 __ jmp(Operand::StaticVariable(after_break_target)); | |
| 123 } | |
| 124 | |
| 125 | |
| 126 void Debug::GenerateLoadICDebugBreak(MacroAssembler* masm) { | |
| 127 // Register state for IC load call (from ic-ia32.cc). | |
| 128 // ----------- S t a t e ------------- | |
| 129 // -- ecx : name | |
| 130 // ----------------------------------- | |
| 131 Generate_DebugBreakCallHelper(masm, ecx.bit(), false); | |
| 132 } | |
| 133 | |
| 134 | |
| 135 void Debug::GenerateStoreICDebugBreak(MacroAssembler* masm) { | |
| 136 // REgister state for IC store call (from ic-ia32.cc). | |
| 137 // ----------- S t a t e ------------- | |
| 138 // -- eax : value | |
| 139 // -- ecx : name | |
| 140 // ----------------------------------- | |
| 141 Generate_DebugBreakCallHelper(masm, eax.bit() | ecx.bit(), false); | |
| 142 } | |
| 143 | |
| 144 | |
| 145 void Debug::GenerateKeyedLoadICDebugBreak(MacroAssembler* masm) { | |
| 146 // Register state for keyed IC load call (from ic-ia32.cc). | |
| 147 // ----------- S t a t e ------------- | |
| 148 // No registers used on entry. | |
| 149 // ----------------------------------- | |
| 150 Generate_DebugBreakCallHelper(masm, 0, false); | |
| 151 } | |
| 152 | |
| 153 | |
| 154 void Debug::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) { | |
| 155 // Register state for keyed IC load call (from ic-ia32.cc). | |
| 156 // ----------- S t a t e ------------- | |
| 157 // -- eax : value | |
| 158 // ----------------------------------- | |
| 159 // Register eax contains an object that needs to be pushed on the | |
| 160 // expression stack of the fake JS frame. | |
| 161 Generate_DebugBreakCallHelper(masm, eax.bit(), false); | |
| 162 } | |
| 163 | |
| 164 | |
| 165 void Debug::GenerateCallICDebugBreak(MacroAssembler* masm) { | |
| 166 // Register state for keyed IC call call (from ic-ia32.cc) | |
| 167 // ----------- S t a t e ------------- | |
| 168 // -- eax: number of arguments | |
| 169 // ----------------------------------- | |
| 170 // The number of arguments in eax is not smi encoded. | |
| 171 Generate_DebugBreakCallHelper(masm, 0, false); | |
| 172 } | |
| 173 | |
| 174 | |
| 175 void Debug::GenerateConstructCallDebugBreak(MacroAssembler* masm) { | |
| 176 // Register state just before return from JS function (from codegen-ia32.cc). | |
| 177 // eax is the actual number of arguments not encoded as a smi see comment | |
| 178 // above IC call. | |
| 179 // ----------- S t a t e ------------- | |
| 180 // -- eax: number of arguments | |
| 181 // ----------------------------------- | |
| 182 // The number of arguments in eax is not smi encoded. | |
| 183 Generate_DebugBreakCallHelper(masm, 0, false); | |
| 184 } | |
| 185 | |
| 186 | |
| 187 void Debug::GenerateReturnDebugBreak(MacroAssembler* masm) { | |
| 188 // Register state just before return from JS function (from codegen-ia32.cc). | |
| 189 // ----------- S t a t e ------------- | |
| 190 // -- eax: return value | |
| 191 // ----------------------------------- | |
| 192 Generate_DebugBreakCallHelper(masm, eax.bit(), true); | |
| 193 } | |
| 194 | |
| 195 | |
| 196 void Debug::GenerateReturnDebugBreakEntry(MacroAssembler* masm) { | |
| 197 // OK to clobber ebx as we are returning from a JS function in the code | |
| 198 // generated by Ia32CodeGenerator::ExitJSFrame. | |
| 199 ExternalReference debug_break_return = | |
| 200 ExternalReference(Debug_Address::DebugBreakReturn()); | |
| 201 __ mov(ebx, Operand::StaticVariable(debug_break_return)); | |
| 202 __ add(Operand(ebx), Immediate(Code::kHeaderSize - kHeapObjectTag)); | |
| 203 __ jmp(Operand(ebx)); | |
| 204 } | |
| 205 | |
| 206 | |
| 207 void Debug::GenerateStubNoRegistersDebugBreak(MacroAssembler* masm) { | |
| 208 // Register state for stub CallFunction (from CallFunctionStub in ic-ia32.cc). | |
| 209 // ----------- S t a t e ------------- | |
| 210 // No registers used on entry. | |
| 211 // ----------------------------------- | |
| 212 Generate_DebugBreakCallHelper(masm, 0, false); | |
| 213 } | |
| 214 | |
| 215 | |
| 216 #undef __ | |
| 217 | |
| 218 #endif // ENABLE_DEBUGGER_SUPPORT | |
| 219 | |
| 220 } } // namespace v8::internal | |
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Chromium Code Reviews
Issue 92068:
Move backend specific files to separate directories. (Closed)
