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Issue 92068: Move backend specific files to separate directories. (Closed)
Patch Set: Added CPPPATH flag and made all includes use same base path. Created 11 years, 8 months ago
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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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