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Issue 7891042: Add asserts to ensure that we: (Closed) Base URL: http://v8.googlecode.com/svn/branches/bleeding_edge/
Patch Set: '' Created 9 years, 3 months ago
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1 // Copyright 2011 the V8 project authors. All rights reserved. 1 // Copyright 2011 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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93 93
94 94
95 #define __ ACCESS_MASM(masm) 95 #define __ ACCESS_MASM(masm)
96 96
97 97
98 static void Generate_DebugBreakCallHelper(MacroAssembler* masm, 98 static void Generate_DebugBreakCallHelper(MacroAssembler* masm,
99 RegList object_regs, 99 RegList object_regs,
100 RegList non_object_regs, 100 RegList non_object_regs,
101 bool convert_call_to_jmp) { 101 bool convert_call_to_jmp) {
102 // Enter an internal frame. 102 // Enter an internal frame.
103 __ EnterInternalFrame(); 103 {
104 FrameScope scope(masm, StackFrame::INTERNAL);
104 105
105 // Store the registers containing live values on the expression stack to 106 // Store the registers containing live values on the expression stack to
106 // make sure that these are correctly updated during GC. Non object values 107 // make sure that these are correctly updated during GC. Non object values
107 // are stored as a smi causing it to be untouched by GC. 108 // are stored as a smi causing it to be untouched by GC.
108 ASSERT((object_regs & ~kJSCallerSaved) == 0); 109 ASSERT((object_regs & ~kJSCallerSaved) == 0);
109 ASSERT((non_object_regs & ~kJSCallerSaved) == 0); 110 ASSERT((non_object_regs & ~kJSCallerSaved) == 0);
110 ASSERT((object_regs & non_object_regs) == 0); 111 ASSERT((object_regs & non_object_regs) == 0);
111 for (int i = 0; i < kNumJSCallerSaved; i++) { 112 for (int i = 0; i < kNumJSCallerSaved; i++) {
112 int r = JSCallerSavedCode(i); 113 int r = JSCallerSavedCode(i);
113 Register reg = { r }; 114 Register reg = { r };
114 if ((object_regs & (1 << r)) != 0) { 115 if ((object_regs & (1 << r)) != 0) {
115 __ push(reg); 116 __ push(reg);
117 }
118 if ((non_object_regs & (1 << r)) != 0) {
119 if (FLAG_debug_code) {
120 __ test(reg, Immediate(0xc0000000));
121 __ Assert(zero, "Unable to encode value as smi");
122 }
123 __ SmiTag(reg);
124 __ push(reg);
125 }
116 } 126 }
117 if ((non_object_regs & (1 << r)) != 0) {
118 if (FLAG_debug_code) {
119 __ test(reg, Immediate(0xc0000000));
120 __ Assert(zero, "Unable to encode value as smi");
121 }
122 __ SmiTag(reg);
123 __ push(reg);
124 }
125 }
126 127
127 #ifdef DEBUG 128 #ifdef DEBUG
128 __ RecordComment("// Calling from debug break to runtime - come in - over"); 129 __ RecordComment("// Calling from debug break to runtime - come in - over");
129 #endif 130 #endif
130 __ Set(eax, Immediate(0)); // No arguments. 131 __ Set(eax, Immediate(0)); // No arguments.
131 __ mov(ebx, Immediate(ExternalReference::debug_break(masm->isolate()))); 132 __ mov(ebx, Immediate(ExternalReference::debug_break(masm->isolate())));
132 133
133 CEntryStub ceb(1); 134 CEntryStub ceb(1);
134 __ CallStub(&ceb); 135 __ CallStub(&ceb);
135 136
136 // Restore the register values containing object pointers from the expression 137 // Restore the register values containing object pointers from the
137 // stack. 138 // expression stack.
138 for (int i = kNumJSCallerSaved; --i >= 0;) { 139 for (int i = kNumJSCallerSaved; --i >= 0;) {
139 int r = JSCallerSavedCode(i); 140 int r = JSCallerSavedCode(i);
140 Register reg = { r }; 141 Register reg = { r };
141 if (FLAG_debug_code) { 142 if (FLAG_debug_code) {
142 __ Set(reg, Immediate(kDebugZapValue)); 143 __ Set(reg, Immediate(kDebugZapValue));
144 }
145 if ((object_regs & (1 << r)) != 0) {
146 __ pop(reg);
147 }
148 if ((non_object_regs & (1 << r)) != 0) {
149 __ pop(reg);
150 __ SmiUntag(reg);
151 }
143 } 152 }
144 if ((object_regs & (1 << r)) != 0) { 153
145 __ pop(reg); 154 // Get rid of the internal frame.
146 }
147 if ((non_object_regs & (1 << r)) != 0) {
148 __ pop(reg);
149 __ SmiUntag(reg);
150 }
151 } 155 }
152 156
153 // Get rid of the internal frame.
154 __ LeaveInternalFrame();
155
156 // If this call did not replace a call but patched other code then there will 157 // If this call did not replace a call but patched other code then there will
157 // be an unwanted return address left on the stack. Here we get rid of that. 158 // be an unwanted return address left on the stack. Here we get rid of that.
158 if (convert_call_to_jmp) { 159 if (convert_call_to_jmp) {
159 __ add(Operand(esp), Immediate(kPointerSize)); 160 __ add(Operand(esp), Immediate(kPointerSize));
160 } 161 }
161 162
162 // Now that the break point has been handled, resume normal execution by 163 // Now that the break point has been handled, resume normal execution by
163 // jumping to the target address intended by the caller and that was 164 // jumping to the target address intended by the caller and that was
164 // overwritten by the address of DebugBreakXXX. 165 // overwritten by the address of DebugBreakXXX.
165 ExternalReference after_break_target = 166 ExternalReference after_break_target =
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303 304
304 const bool Debug::kFrameDropperSupported = true; 305 const bool Debug::kFrameDropperSupported = true;
305 306
306 #undef __ 307 #undef __
307 308
308 #endif // ENABLE_DEBUGGER_SUPPORT 309 #endif // ENABLE_DEBUGGER_SUPPORT
309 310
310 } } // namespace v8::internal 311 } } // namespace v8::internal
311 312
312 #endif // V8_TARGET_ARCH_IA32 313 #endif // V8_TARGET_ARCH_IA32
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