DFG OSR exit doesn't know which virtual register to use for the last result register...
[WebKit-https.git] / Source / JavaScriptCore / jit / JITCall32_64.cpp
1 /*
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8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
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24  */
25
26 #include "config.h"
27
28 #if ENABLE(JIT)
29 #if USE(JSVALUE32_64)
30 #include "JIT.h"
31
32 #include "Arguments.h"
33 #include "CodeBlock.h"
34 #include "Interpreter.h"
35 #include "JITInlines.h"
36 #include "JITStubCall.h"
37 #include "JSArray.h"
38 #include "JSFunction.h"
39 #include "Operations.h"
40 #include "RepatchBuffer.h"
41 #include "ResultType.h"
42 #include "SamplingTool.h"
43 #include <wtf/StringPrintStream.h>
44
45 #ifndef NDEBUG
46 #include <stdio.h>
47 #endif
48
49 using namespace std;
50
51 namespace JSC {
52
53 void JIT::emit_op_call_put_result(Instruction* instruction)
54 {
55     int dst = instruction[1].u.operand;
56     emitValueProfilingSite();
57     emitStore(dst, regT1, regT0);
58 }
59
60 void JIT::emit_op_ret(Instruction* currentInstruction)
61 {
62     unsigned dst = currentInstruction[1].u.operand;
63
64     emitLoad(dst, regT1, regT0);
65     emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT2);
66     emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
67
68     restoreReturnAddressBeforeReturn(regT2);
69     ret();
70 }
71
72 void JIT::emit_op_ret_object_or_this(Instruction* currentInstruction)
73 {
74     unsigned result = currentInstruction[1].u.operand;
75     unsigned thisReg = currentInstruction[2].u.operand;
76
77     emitLoad(result, regT1, regT0);
78     Jump notJSCell = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
79     loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
80     Jump notObject = emitJumpIfNotObject(regT2);
81
82     emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT2);
83     emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
84
85     restoreReturnAddressBeforeReturn(regT2);
86     ret();
87
88     notJSCell.link(this);
89     notObject.link(this);
90     emitLoad(thisReg, regT1, regT0);
91
92     emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT2);
93     emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
94
95     restoreReturnAddressBeforeReturn(regT2);
96     ret();
97 }
98
99 void JIT::emitSlow_op_call(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
100 {
101     compileOpCallSlowCase(op_call, currentInstruction, iter, m_callLinkInfoIndex++);
102 }
103
104 void JIT::emitSlow_op_call_eval(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
105 {
106     compileOpCallSlowCase(op_call_eval, currentInstruction, iter, m_callLinkInfoIndex);
107 }
108  
109 void JIT::emitSlow_op_call_varargs(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
110 {
111     compileOpCallSlowCase(op_call_varargs, currentInstruction, iter, m_callLinkInfoIndex++);
112 }
113
114 void JIT::emitSlow_op_construct(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
115 {
116     compileOpCallSlowCase(op_construct, currentInstruction, iter, m_callLinkInfoIndex++);
117 }
118
119 void JIT::emit_op_call(Instruction* currentInstruction)
120 {
121     compileOpCall(op_call, currentInstruction, m_callLinkInfoIndex++);
122 }
123
124 void JIT::emit_op_call_eval(Instruction* currentInstruction)
125 {
126     compileOpCall(op_call_eval, currentInstruction, m_callLinkInfoIndex);
127 }
128
129 void JIT::emit_op_call_varargs(Instruction* currentInstruction)
130 {
131     compileOpCall(op_call_varargs, currentInstruction, m_callLinkInfoIndex++);
132 }
133
134 void JIT::emit_op_construct(Instruction* currentInstruction)
135 {
136     compileOpCall(op_construct, currentInstruction, m_callLinkInfoIndex++);
137 }
138
139 void JIT::compileLoadVarargs(Instruction* instruction)
140 {
141     int thisValue = instruction[2].u.operand;
142     int arguments = instruction[3].u.operand;
143     int firstFreeRegister = instruction[4].u.operand;
144
145     JumpList slowCase;
146     JumpList end;
147     bool canOptimize = m_codeBlock->usesArguments()
148         && arguments == m_codeBlock->argumentsRegister()
149         && !m_codeBlock->symbolTable()->slowArguments();
150
151     if (canOptimize) {
152         emitLoadTag(arguments, regT1);
153         slowCase.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::EmptyValueTag)));
154
155         load32(payloadFor(JSStack::ArgumentCount), regT2);
156         slowCase.append(branch32(Above, regT2, TrustedImm32(Arguments::MaxArguments + 1)));
157         // regT2: argumentCountIncludingThis
158
159         move(regT2, regT3);
160         add32(TrustedImm32(firstFreeRegister + JSStack::CallFrameHeaderSize), regT3);
161         lshift32(TrustedImm32(3), regT3);
162         addPtr(callFrameRegister, regT3);
163         // regT3: newCallFrame
164
165         slowCase.append(branchPtr(Below, AbsoluteAddress(m_globalData->interpreter->stack().addressOfEnd()), regT3));
166
167         // Initialize ArgumentCount.
168         store32(regT2, payloadFor(JSStack::ArgumentCount, regT3));
169
170         // Initialize 'this'.
171         emitLoad(thisValue, regT1, regT0);
172         store32(regT0, Address(regT3, OBJECT_OFFSETOF(JSValue, u.asBits.payload) + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
173         store32(regT1, Address(regT3, OBJECT_OFFSETOF(JSValue, u.asBits.tag) + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
174
175         // Copy arguments.
176         neg32(regT2);
177         end.append(branchAdd32(Zero, TrustedImm32(1), regT2));
178         // regT2: -argumentCount;
179
180         Label copyLoop = label();
181         load32(BaseIndex(callFrameRegister, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))), regT0);
182         load32(BaseIndex(callFrameRegister, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))), regT1);
183         store32(regT0, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
184         store32(regT1, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
185         branchAdd32(NonZero, TrustedImm32(1), regT2).linkTo(copyLoop, this);
186
187         end.append(jump());
188     }
189
190     if (canOptimize)
191         slowCase.link(this);
192
193     JITStubCall stubCall(this, cti_op_load_varargs);
194     stubCall.addArgument(thisValue);
195     stubCall.addArgument(arguments);
196     stubCall.addArgument(Imm32(firstFreeRegister));
197     stubCall.call(regT3);
198
199     if (canOptimize)
200         end.link(this);
201 }
202
203 void JIT::compileCallEval()
204 {
205     JITStubCall stubCall(this, cti_op_call_eval); // Initializes ScopeChain; ReturnPC; CodeBlock.
206     stubCall.call();
207     addSlowCase(branch32(Equal, regT1, TrustedImm32(JSValue::EmptyValueTag)));
208     emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
209
210     sampleCodeBlock(m_codeBlock);
211 }
212
213 void JIT::compileCallEvalSlowCase(Vector<SlowCaseEntry>::iterator& iter)
214 {
215     linkSlowCase(iter);
216
217     emitLoad(JSStack::Callee, regT1, regT0);
218     emitNakedCall(m_globalData->getCTIStub(virtualCallGenerator).code());
219
220     sampleCodeBlock(m_codeBlock);
221 }
222
223 void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned callLinkInfoIndex)
224 {
225     int callee = instruction[1].u.operand;
226
227     /* Caller always:
228         - Updates callFrameRegister to callee callFrame.
229         - Initializes ArgumentCount; CallerFrame; Callee.
230
231        For a JS call:
232         - Caller initializes ScopeChain.
233         - Callee initializes ReturnPC; CodeBlock.
234         - Callee restores callFrameRegister before return.
235
236        For a non-JS call:
237         - Caller initializes ScopeChain; ReturnPC; CodeBlock.
238         - Caller restores callFrameRegister after return.
239     */
240     
241     if (opcodeID == op_call_varargs)
242         compileLoadVarargs(instruction);
243     else {
244         int argCount = instruction[2].u.operand;
245         int registerOffset = instruction[3].u.operand;
246         
247         if (opcodeID == op_call && shouldEmitProfiling()) {
248             emitLoad(registerOffset + CallFrame::argumentOffsetIncludingThis(0), regT0, regT1);
249             Jump done = branch32(NotEqual, regT0, TrustedImm32(JSValue::CellTag));
250             loadPtr(Address(regT1, JSCell::structureOffset()), regT1);
251             storePtr(regT1, instruction[5].u.arrayProfile->addressOfLastSeenStructure());
252             done.link(this);
253         }
254     
255         addPtr(TrustedImm32(registerOffset * sizeof(Register)), callFrameRegister, regT3);
256
257         store32(TrustedImm32(argCount), payloadFor(JSStack::ArgumentCount, regT3));
258     } // regT3 holds newCallFrame with ArgumentCount initialized.
259     
260     storePtr(TrustedImmPtr(instruction), tagFor(JSStack::ArgumentCount, callFrameRegister));
261     emitLoad(callee, regT1, regT0); // regT1, regT0 holds callee.
262
263     storePtr(callFrameRegister, Address(regT3, JSStack::CallerFrame * static_cast<int>(sizeof(Register))));
264     emitStore(JSStack::Callee, regT1, regT0, regT3);
265     move(regT3, callFrameRegister);
266
267     if (opcodeID == op_call_eval) {
268         compileCallEval();
269         return;
270     }
271
272     DataLabelPtr addressOfLinkedFunctionCheck;
273     BEGIN_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
274     Jump slowCase = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(0));
275     END_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
276
277     addSlowCase(slowCase);
278     addSlowCase(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
279
280     ASSERT(m_callStructureStubCompilationInfo.size() == callLinkInfoIndex);
281     m_callStructureStubCompilationInfo.append(StructureStubCompilationInfo());
282     m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathBegin = addressOfLinkedFunctionCheck;
283     m_callStructureStubCompilationInfo[callLinkInfoIndex].callType = CallLinkInfo::callTypeFor(opcodeID);
284     m_callStructureStubCompilationInfo[callLinkInfoIndex].bytecodeIndex = m_bytecodeOffset;
285
286     loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scope)), regT1);
287     emitPutCellToCallFrameHeader(regT1, JSStack::ScopeChain);
288     m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall();
289
290     sampleCodeBlock(m_codeBlock);
291 }
292
293 void JIT::compileOpCallSlowCase(OpcodeID opcodeID, Instruction*, Vector<SlowCaseEntry>::iterator& iter, unsigned callLinkInfoIndex)
294 {
295     if (opcodeID == op_call_eval) {
296         compileCallEvalSlowCase(iter);
297         return;
298     }
299
300     linkSlowCase(iter);
301     linkSlowCase(iter);
302     
303     m_callStructureStubCompilationInfo[callLinkInfoIndex].callReturnLocation = emitNakedCall(opcodeID == op_construct ? m_globalData->getCTIStub(linkConstructGenerator).code() : m_globalData->getCTIStub(linkCallGenerator).code());
304
305     sampleCodeBlock(m_codeBlock);
306 }
307
308 void JIT::privateCompileClosureCall(CallLinkInfo* callLinkInfo, CodeBlock* calleeCodeBlock, Structure* expectedStructure, ExecutableBase* expectedExecutable, MacroAssemblerCodePtr codePtr)
309 {
310     JumpList slowCases;
311
312     slowCases.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
313     slowCases.append(branchPtr(NotEqual, Address(regT0, JSCell::structureOffset()), TrustedImmPtr(expectedStructure)));
314     slowCases.append(branchPtr(NotEqual, Address(regT0, JSFunction::offsetOfExecutable()), TrustedImmPtr(expectedExecutable)));
315     
316     loadPtr(Address(regT0, JSFunction::offsetOfScopeChain()), regT1);
317     emitPutCellToCallFrameHeader(regT1, JSStack::ScopeChain);
318     
319     Call call = nearCall();
320     Jump done = jump();
321     
322     slowCases.link(this);
323     move(TrustedImmPtr(callLinkInfo->callReturnLocation.executableAddress()), regT2);
324     restoreReturnAddressBeforeReturn(regT2);
325     Jump slow = jump();
326     
327     LinkBuffer patchBuffer(*m_globalData, this, m_codeBlock);
328     
329     patchBuffer.link(call, FunctionPtr(codePtr.executableAddress()));
330     patchBuffer.link(done, callLinkInfo->hotPathOther.labelAtOffset(0));
331     patchBuffer.link(slow, CodeLocationLabel(m_globalData->getCTIStub(virtualCallGenerator).code()));
332     
333     RefPtr<ClosureCallStubRoutine> stubRoutine = adoptRef(new ClosureCallStubRoutine(
334         FINALIZE_CODE(
335             patchBuffer,
336             ("Baseline closure call stub for %s, return point %p, target %p (%s)",
337                 toCString(*m_codeBlock).data(),
338                 callLinkInfo->hotPathOther.labelAtOffset(0).executableAddress(),
339                 codePtr.executableAddress(),
340                 toCString(*calleeCodeBlock).data())),
341         *m_globalData, m_codeBlock->ownerExecutable(), expectedStructure, expectedExecutable,
342         callLinkInfo->codeOrigin));
343     
344     RepatchBuffer repatchBuffer(m_codeBlock);
345     
346     repatchBuffer.replaceWithJump(
347         RepatchBuffer::startOfBranchPtrWithPatchOnRegister(callLinkInfo->hotPathBegin),
348         CodeLocationLabel(stubRoutine->code().code()));
349     repatchBuffer.relink(callLinkInfo->callReturnLocation, m_globalData->getCTIStub(virtualCallGenerator).code());
350     
351     callLinkInfo->stub = stubRoutine.release();
352 }
353
354 } // namespace JSC
355
356 #endif // USE(JSVALUE32_64)
357 #endif // ENABLE(JIT)