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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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117 } 117 }
118 118
119 119
120 #define __ ACCESS_MASM(masm) 120 #define __ ACCESS_MASM(masm)
121 121
122 122
123 123
124 static void Generate_DebugBreakCallHelper(MacroAssembler* masm, 124 static void Generate_DebugBreakCallHelper(MacroAssembler* masm,
125 RegList object_regs, 125 RegList object_regs,
126 RegList non_object_regs) { 126 RegList non_object_regs) {
127 __ EnterInternalFrame(); 127 {
128 FrameScope scope(masm, StackFrame::INTERNAL);
128 129
129 // Store the registers containing live values on the expression stack to 130 // Store the registers containing live values on the expression stack to
130 // make sure that these are correctly updated during GC. Non object values 131 // make sure that these are correctly updated during GC. Non object values
131 // are stored as a smi causing it to be untouched by GC. 132 // are stored as a smi causing it to be untouched by GC.
132 ASSERT((object_regs & ~kJSCallerSaved) == 0); 133 ASSERT((object_regs & ~kJSCallerSaved) == 0);
133 ASSERT((non_object_regs & ~kJSCallerSaved) == 0); 134 ASSERT((non_object_regs & ~kJSCallerSaved) == 0);
134 ASSERT((object_regs & non_object_regs) == 0); 135 ASSERT((object_regs & non_object_regs) == 0);
135 if ((object_regs | non_object_regs) != 0) { 136 if ((object_regs | non_object_regs) != 0) {
136 for (int i = 0; i < kNumJSCallerSaved; i++) { 137 for (int i = 0; i < kNumJSCallerSaved; i++) {
137 int r = JSCallerSavedCode(i); 138 int r = JSCallerSavedCode(i);
138 Register reg = { r }; 139 Register reg = { r };
139 if ((non_object_regs & (1 << r)) != 0) { 140 if ((non_object_regs & (1 << r)) != 0) {
140 if (FLAG_debug_code) { 141 if (FLAG_debug_code) {
141 __ And(at, reg, 0xc0000000); 142 __ And(at, reg, 0xc0000000);
142 __ Assert(eq, "Unable to encode value as smi", at, Operand(zero_reg)); 143 __ Assert(
144 eq, "Unable to encode value as smi", at, Operand(zero_reg));
145 }
146 __ sll(reg, reg, kSmiTagSize);
143 } 147 }
144 __ sll(reg, reg, kSmiTagSize); 148 }
149 __ MultiPush(object_regs | non_object_regs);
150 }
151
152 #ifdef DEBUG
153 __ RecordComment("// Calling from debug break to runtime - come in - over");
154 #endif
155 __ mov(a0, zero_reg); // No arguments.
156 __ li(a1, Operand(ExternalReference::debug_break(masm->isolate())));
157
158 CEntryStub ceb(1);
159 __ CallStub(&ceb);
160
161 // Restore the register values from the expression stack.
162 if ((object_regs | non_object_regs) != 0) {
163 __ MultiPop(object_regs | non_object_regs);
164 for (int i = 0; i < kNumJSCallerSaved; i++) {
165 int r = JSCallerSavedCode(i);
166 Register reg = { r };
167 if ((non_object_regs & (1 << r)) != 0) {
168 __ srl(reg, reg, kSmiTagSize);
169 }
170 if (FLAG_debug_code &&
171 (((object_regs |non_object_regs) & (1 << r)) == 0)) {
172 __ li(reg, kDebugZapValue);
173 }
145 } 174 }
146 } 175 }
147 __ MultiPush(object_regs | non_object_regs); 176
177 // Leave the internal frame.
148 } 178 }
149 179
150 #ifdef DEBUG
151 __ RecordComment("// Calling from debug break to runtime - come in - over");
152 #endif
153 __ mov(a0, zero_reg); // No arguments.
154 __ li(a1, Operand(ExternalReference::debug_break(masm->isolate())));
155
156 CEntryStub ceb(1);
157 __ CallStub(&ceb);
158
159 // Restore the register values from the expression stack.
160 if ((object_regs | non_object_regs) != 0) {
161 __ MultiPop(object_regs | non_object_regs);
162 for (int i = 0; i < kNumJSCallerSaved; i++) {
163 int r = JSCallerSavedCode(i);
164 Register reg = { r };
165 if ((non_object_regs & (1 << r)) != 0) {
166 __ srl(reg, reg, kSmiTagSize);
167 }
168 if (FLAG_debug_code &&
169 (((object_regs |non_object_regs) & (1 << r)) == 0)) {
170 __ li(reg, kDebugZapValue);
171 }
172 }
173 }
174
175 __ LeaveInternalFrame();
176
177 // Now that the break point has been handled, resume normal execution by 180 // Now that the break point has been handled, resume normal execution by
178 // jumping to the target address intended by the caller and that was 181 // jumping to the target address intended by the caller and that was
179 // overwritten by the address of DebugBreakXXX. 182 // overwritten by the address of DebugBreakXXX.
180 __ li(t9, Operand( 183 __ li(t9, Operand(
181 ExternalReference(Debug_Address::AfterBreakTarget(), masm->isolate()))); 184 ExternalReference(Debug_Address::AfterBreakTarget(), masm->isolate())));
182 __ lw(t9, MemOperand(t9)); 185 __ lw(t9, MemOperand(t9));
183 __ Jump(t9); 186 __ Jump(t9);
184 } 187 }
185 188
186 189
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299 const bool Debug::kFrameDropperSupported = false; 302 const bool Debug::kFrameDropperSupported = false;
300 303
301 #undef __ 304 #undef __
302 305
303 306
304 #endif // ENABLE_DEBUGGER_SUPPORT 307 #endif // ENABLE_DEBUGGER_SUPPORT
305 308
306 } } // namespace v8::internal 309 } } // namespace v8::internal
307 310
308 #endif // V8_TARGET_ARCH_MIPS 311 #endif // V8_TARGET_ARCH_MIPS
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