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1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef V8_CRANKSHAFT_MIPS_LITHIUM_CODEGEN_MIPS_H_
6 #define V8_CRANKSHAFT_MIPS_LITHIUM_CODEGEN_MIPS_H_
7 
8 #include "src/ast/scopes.h"
9 #include "src/crankshaft/lithium-codegen.h"
10 #include "src/crankshaft/mips/lithium-gap-resolver-mips.h"
11 #include "src/crankshaft/mips/lithium-mips.h"
12 #include "src/deoptimizer.h"
13 #include "src/safepoint-table.h"
14 #include "src/utils.h"
15 
16 namespace v8 {
17 namespace internal {
18 
19 // Forward declarations.
20 class LDeferredCode;
21 class SafepointGenerator;
22 
23 class LCodeGen: public LCodeGenBase {
24  public:
LCodeGen(LChunk * chunk,MacroAssembler * assembler,CompilationInfo * info)25   LCodeGen(LChunk* chunk, MacroAssembler* assembler, CompilationInfo* info)
26       : LCodeGenBase(chunk, assembler, info),
27         jump_table_(4, info->zone()),
28         scope_(info->scope()),
29         deferred_(8, info->zone()),
30         frame_is_built_(false),
31         safepoints_(info->zone()),
32         resolver_(this),
33         expected_safepoint_kind_(Safepoint::kSimple) {
34     PopulateDeoptimizationLiteralsWithInlinedFunctions();
35   }
36 
37 
LookupDestination(int block_id)38   int LookupDestination(int block_id) const {
39     return chunk()->LookupDestination(block_id);
40   }
41 
IsNextEmittedBlock(int block_id)42   bool IsNextEmittedBlock(int block_id) const {
43     return LookupDestination(block_id) == GetNextEmittedBlock();
44   }
45 
NeedsEagerFrame()46   bool NeedsEagerFrame() const {
47     return HasAllocatedStackSlots() || info()->is_non_deferred_calling() ||
48            !info()->IsStub() || info()->requires_frame();
49   }
NeedsDeferredFrame()50   bool NeedsDeferredFrame() const {
51     return !NeedsEagerFrame() && info()->is_deferred_calling();
52   }
53 
GetRAState()54   RAStatus GetRAState() const {
55     return frame_is_built_ ? kRAHasBeenSaved : kRAHasNotBeenSaved;
56   }
57 
58   // Support for converting LOperands to assembler types.
59   // LOperand must be a register.
60   Register ToRegister(LOperand* op) const;
61 
62   // LOperand is loaded into scratch, unless already a register.
63   Register EmitLoadRegister(LOperand* op, Register scratch);
64 
65   // LOperand must be a double register.
66   DoubleRegister ToDoubleRegister(LOperand* op) const;
67 
68   // LOperand is loaded into dbl_scratch, unless already a double register.
69   DoubleRegister EmitLoadDoubleRegister(LOperand* op,
70                                         FloatRegister flt_scratch,
71                                         DoubleRegister dbl_scratch);
72   int32_t ToRepresentation(LConstantOperand* op, const Representation& r) const;
73   int32_t ToInteger32(LConstantOperand* op) const;
74   Smi* ToSmi(LConstantOperand* op) const;
75   double ToDouble(LConstantOperand* op) const;
76   Operand ToOperand(LOperand* op);
77   MemOperand ToMemOperand(LOperand* op) const;
78   // Returns a MemOperand pointing to the high word of a DoubleStackSlot.
79   MemOperand ToHighMemOperand(LOperand* op) const;
80 
81   bool IsInteger32(LConstantOperand* op) const;
82   bool IsSmi(LConstantOperand* op) const;
83   Handle<Object> ToHandle(LConstantOperand* op) const;
84 
85   // Try to generate code for the entire chunk, but it may fail if the
86   // chunk contains constructs we cannot handle. Returns true if the
87   // code generation attempt succeeded.
88   bool GenerateCode();
89 
90   // Finish the code by setting stack height, safepoint, and bailout
91   // information on it.
92   void FinishCode(Handle<Code> code);
93 
94   void DoDeferredNumberTagD(LNumberTagD* instr);
95 
96   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
97   void DoDeferredNumberTagIU(LInstruction* instr,
98                              LOperand* value,
99                              LOperand* temp1,
100                              LOperand* temp2,
101                              IntegerSignedness signedness);
102 
103   void DoDeferredTaggedToI(LTaggedToI* instr);
104   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
105   void DoDeferredStackCheck(LStackCheck* instr);
106   void DoDeferredMaybeGrowElements(LMaybeGrowElements* instr);
107   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
108   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
109   void DoDeferredAllocate(LAllocate* instr);
110   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
111   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
112                                    Register result,
113                                    Register object,
114                                    Register index);
115 
116   // Parallel move support.
117   void DoParallelMove(LParallelMove* move);
118   void DoGap(LGap* instr);
119 
120   MemOperand PrepareKeyedOperand(Register key,
121                                  Register base,
122                                  bool key_is_constant,
123                                  int constant_key,
124                                  int element_size,
125                                  int shift_size,
126                                  int base_offset);
127 
128   // Emit frame translation commands for an environment.
129   void WriteTranslation(LEnvironment* environment, Translation* translation);
130 
131   // Declare methods that deal with the individual node types.
132 #define DECLARE_DO(type) void Do##type(L##type* node);
LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)133   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
134 #undef DECLARE_DO
135 
136  private:
137   Scope* scope() const { return scope_; }
138 
scratch0()139   Register scratch0() { return kLithiumScratchReg; }
scratch1()140   Register scratch1() { return kLithiumScratchReg2; }
double_scratch0()141   DoubleRegister double_scratch0() { return kLithiumScratchDouble; }
142 
143   LInstruction* GetNextInstruction();
144 
145   void EmitClassOfTest(Label* if_true,
146                        Label* if_false,
147                        Handle<String> class_name,
148                        Register input,
149                        Register temporary,
150                        Register temporary2);
151 
HasAllocatedStackSlots()152   bool HasAllocatedStackSlots() const {
153     return chunk()->HasAllocatedStackSlots();
154   }
GetStackSlotCount()155   int GetStackSlotCount() const { return chunk()->GetSpillSlotCount(); }
GetTotalFrameSlotCount()156   int GetTotalFrameSlotCount() const {
157     return chunk()->GetTotalFrameSlotCount();
158   }
159 
AddDeferredCode(LDeferredCode * code)160   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
161 
162   void SaveCallerDoubles();
163   void RestoreCallerDoubles();
164 
165   // Code generation passes.  Returns true if code generation should
166   // continue.
167   void GenerateBodyInstructionPre(LInstruction* instr) override;
168   bool GeneratePrologue();
169   bool GenerateDeferredCode();
170   bool GenerateJumpTable();
171   bool GenerateSafepointTable();
172 
173   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
174   void GenerateOsrPrologue();
175 
176   enum SafepointMode {
177     RECORD_SIMPLE_SAFEPOINT,
178     RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS
179   };
180 
181   void CallCode(Handle<Code> code,
182                 RelocInfo::Mode mode,
183                 LInstruction* instr);
184 
185   void CallCodeGeneric(Handle<Code> code,
186                        RelocInfo::Mode mode,
187                        LInstruction* instr,
188                        SafepointMode safepoint_mode);
189 
190   void CallRuntime(const Runtime::Function* function,
191                    int num_arguments,
192                    LInstruction* instr,
193                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
194 
CallRuntime(Runtime::FunctionId id,int num_arguments,LInstruction * instr)195   void CallRuntime(Runtime::FunctionId id,
196                    int num_arguments,
197                    LInstruction* instr) {
198     const Runtime::Function* function = Runtime::FunctionForId(id);
199     CallRuntime(function, num_arguments, instr);
200   }
201 
CallRuntime(Runtime::FunctionId id,LInstruction * instr)202   void CallRuntime(Runtime::FunctionId id, LInstruction* instr) {
203     const Runtime::Function* function = Runtime::FunctionForId(id);
204     CallRuntime(function, function->nargs, instr);
205   }
206 
207   void LoadContextFromDeferred(LOperand* context);
208   void CallRuntimeFromDeferred(Runtime::FunctionId id,
209                                int argc,
210                                LInstruction* instr,
211                                LOperand* context);
212 
213   void PrepareForTailCall(const ParameterCount& actual, Register scratch1,
214                           Register scratch2, Register scratch3);
215 
216   // Generate a direct call to a known function.  Expects the function
217   // to be in a1.
218   void CallKnownFunction(Handle<JSFunction> function,
219                          int formal_parameter_count, int arity,
220                          bool is_tail_call, LInstruction* instr);
221 
222   void RecordSafepointWithLazyDeopt(LInstruction* instr,
223                                     SafepointMode safepoint_mode);
224 
225   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
226                                             Safepoint::DeoptMode mode);
227   void DeoptimizeIf(Condition condition, LInstruction* instr,
228                     Deoptimizer::DeoptReason deopt_reason,
229                     Deoptimizer::BailoutType bailout_type,
230                     Register src1 = zero_reg,
231                     const Operand& src2 = Operand(zero_reg));
232   void DeoptimizeIf(
233       Condition condition, LInstruction* instr,
234       Deoptimizer::DeoptReason deopt_reason = Deoptimizer::kNoReason,
235       Register src1 = zero_reg, const Operand& src2 = Operand(zero_reg));
236 
237   void AddToTranslation(LEnvironment* environment,
238                         Translation* translation,
239                         LOperand* op,
240                         bool is_tagged,
241                         bool is_uint32,
242                         int* object_index_pointer,
243                         int* dematerialized_index_pointer);
244 
245   Register ToRegister(int index) const;
246   DoubleRegister ToDoubleRegister(int index) const;
247 
248   MemOperand BuildSeqStringOperand(Register string,
249                                    LOperand* index,
250                                    String::Encoding encoding);
251 
252   void EmitIntegerMathAbs(LMathAbs* instr);
253 
254   // Support for recording safepoint and position information.
255   void RecordSafepoint(LPointerMap* pointers,
256                        Safepoint::Kind kind,
257                        int arguments,
258                        Safepoint::DeoptMode mode);
259   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
260   void RecordSafepoint(Safepoint::DeoptMode mode);
261   void RecordSafepointWithRegisters(LPointerMap* pointers,
262                                     int arguments,
263                                     Safepoint::DeoptMode mode);
264 
265   void RecordAndWritePosition(int position) override;
266 
267   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
268   void EmitGoto(int block);
269 
270   // EmitBranch expects to be the last instruction of a block.
271   template<class InstrType>
272   void EmitBranch(InstrType instr,
273                   Condition condition,
274                   Register src1,
275                   const Operand& src2);
276   template<class InstrType>
277   void EmitBranchF(InstrType instr,
278                    Condition condition,
279                    FPURegister src1,
280                    FPURegister src2);
281   template <class InstrType>
282   void EmitTrueBranch(InstrType instr, Condition condition, Register src1,
283                       const Operand& src2);
284   template <class InstrType>
285   void EmitFalseBranch(InstrType instr, Condition condition, Register src1,
286                        const Operand& src2);
287   template<class InstrType>
288   void EmitFalseBranchF(InstrType instr,
289                         Condition condition,
290                         FPURegister src1,
291                         FPURegister src2);
292   void EmitCmpI(LOperand* left, LOperand* right);
293   void EmitNumberUntagD(LNumberUntagD* instr, Register input,
294                         DoubleRegister result, NumberUntagDMode mode);
295 
296   // Emits optimized code for typeof x == "y".  Modifies input register.
297   // Returns the condition on which a final split to
298   // true and false label should be made, to optimize fallthrough.
299   // Returns two registers in cmp1 and cmp2 that can be used in the
300   // Branch instruction after EmitTypeofIs.
301   Condition EmitTypeofIs(Label* true_label,
302                          Label* false_label,
303                          Register input,
304                          Handle<String> type_name,
305                          Register* cmp1,
306                          Operand* cmp2);
307 
308   // Emits optimized code for %_IsString(x).  Preserves input register.
309   // Returns the condition on which a final split to
310   // true and false label should be made, to optimize fallthrough.
311   Condition EmitIsString(Register input,
312                          Register temp1,
313                          Label* is_not_string,
314                          SmiCheck check_needed);
315 
316   // Emits optimized code to deep-copy the contents of statically known
317   // object graphs (e.g. object literal boilerplate).
318   void EmitDeepCopy(Handle<JSObject> object,
319                     Register result,
320                     Register source,
321                     int* offset,
322                     AllocationSiteMode mode);
323   // Emit optimized code for integer division.
324   // Inputs are signed.
325   // All registers are clobbered.
326   // If 'remainder' is no_reg, it is not computed.
327   void EmitSignedIntegerDivisionByConstant(Register result,
328                                            Register dividend,
329                                            int32_t divisor,
330                                            Register remainder,
331                                            Register scratch,
332                                            LEnvironment* environment);
333 
334 
335   void EnsureSpaceForLazyDeopt(int space_needed) override;
336   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
337   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
338   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
339   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
340   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
341   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
342 
343   template <class T>
344   void EmitVectorLoadICRegisters(T* instr);
345   template <class T>
346   void EmitVectorStoreICRegisters(T* instr);
347 
348   ZoneList<Deoptimizer::JumpTableEntry> jump_table_;
349   Scope* const scope_;
350   ZoneList<LDeferredCode*> deferred_;
351   bool frame_is_built_;
352 
353   // Builder that keeps track of safepoints in the code. The table
354   // itself is emitted at the end of the generated code.
355   SafepointTableBuilder safepoints_;
356 
357   // Compiler from a set of parallel moves to a sequential list of moves.
358   LGapResolver resolver_;
359 
360   Safepoint::Kind expected_safepoint_kind_;
361 
362   class PushSafepointRegistersScope final BASE_EMBEDDED {
363    public:
PushSafepointRegistersScope(LCodeGen * codegen)364     explicit PushSafepointRegistersScope(LCodeGen* codegen)
365         : codegen_(codegen) {
366       DCHECK(codegen_->info()->is_calling());
367       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
368       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
369 
370       StoreRegistersStateStub stub(codegen_->isolate());
371       codegen_->masm_->push(ra);
372       codegen_->masm_->CallStub(&stub);
373     }
374 
~PushSafepointRegistersScope()375     ~PushSafepointRegistersScope() {
376       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
377       RestoreRegistersStateStub stub(codegen_->isolate());
378       codegen_->masm_->push(ra);
379       codegen_->masm_->CallStub(&stub);
380       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
381     }
382 
383    private:
384     LCodeGen* codegen_;
385   };
386 
387   friend class LDeferredCode;
388   friend class LEnvironment;
389   friend class SafepointGenerator;
390   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
391 };
392 
393 
394 class LDeferredCode : public ZoneObject {
395  public:
LDeferredCode(LCodeGen * codegen)396   explicit LDeferredCode(LCodeGen* codegen)
397       : codegen_(codegen),
398         external_exit_(NULL),
399         instruction_index_(codegen->current_instruction_) {
400     codegen->AddDeferredCode(this);
401   }
402 
~LDeferredCode()403   virtual ~LDeferredCode() {}
404   virtual void Generate() = 0;
405   virtual LInstruction* instr() = 0;
406 
SetExit(Label * exit)407   void SetExit(Label* exit) { external_exit_ = exit; }
entry()408   Label* entry() { return &entry_; }
exit()409   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
instruction_index()410   int instruction_index() const { return instruction_index_; }
411 
412  protected:
codegen()413   LCodeGen* codegen() const { return codegen_; }
masm()414   MacroAssembler* masm() const { return codegen_->masm(); }
415 
416  private:
417   LCodeGen* codegen_;
418   Label entry_;
419   Label exit_;
420   Label* external_exit_;
421   int instruction_index_;
422 };
423 
424 }  // namespace internal
425 }  // namespace v8
426 
427 #endif  // V8_CRANKSHAFT_MIPS_LITHIUM_CODEGEN_MIPS_H_
428