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_IA32_LITHIUM_CODEGEN_IA32_H_
6 #define V8_CRANKSHAFT_IA32_LITHIUM_CODEGEN_IA32_H_
7 
8 #include "src/ast/scopes.h"
9 #include "src/base/logging.h"
10 #include "src/crankshaft/ia32/lithium-gap-resolver-ia32.h"
11 #include "src/crankshaft/ia32/lithium-ia32.h"
12 #include "src/crankshaft/lithium-codegen.h"
13 #include "src/deoptimizer.h"
14 #include "src/safepoint-table.h"
15 #include "src/utils.h"
16 
17 namespace v8 {
18 namespace internal {
19 
20 // Forward declarations.
21 class LDeferredCode;
22 class LGapNode;
23 class SafepointGenerator;
24 
25 class LCodeGen: public LCodeGenBase {
26  public:
LCodeGen(LChunk * chunk,MacroAssembler * assembler,CompilationInfo * info)27   LCodeGen(LChunk* chunk, MacroAssembler* assembler, CompilationInfo* info)
28       : LCodeGenBase(chunk, assembler, info),
29         jump_table_(4, info->zone()),
30         scope_(info->scope()),
31         deferred_(8, info->zone()),
32         frame_is_built_(false),
33         safepoints_(info->zone()),
34         resolver_(this),
35         expected_safepoint_kind_(Safepoint::kSimple) {
36     PopulateDeoptimizationLiteralsWithInlinedFunctions();
37   }
38 
LookupDestination(int block_id)39   int LookupDestination(int block_id) const {
40     return chunk()->LookupDestination(block_id);
41   }
42 
IsNextEmittedBlock(int block_id)43   bool IsNextEmittedBlock(int block_id) const {
44     return LookupDestination(block_id) == GetNextEmittedBlock();
45   }
46 
NeedsEagerFrame()47   bool NeedsEagerFrame() const {
48     return HasAllocatedStackSlots() || info()->is_non_deferred_calling() ||
49            !info()->IsStub() || info()->requires_frame();
50   }
NeedsDeferredFrame()51   bool NeedsDeferredFrame() const {
52     return !NeedsEagerFrame() && info()->is_deferred_calling();
53   }
54 
55   // Support for converting LOperands to assembler types.
56   Operand ToOperand(LOperand* op) const;
57   Register ToRegister(LOperand* op) const;
58   XMMRegister ToDoubleRegister(LOperand* op) const;
59 
60   bool IsInteger32(LConstantOperand* op) const;
61   bool IsSmi(LConstantOperand* op) const;
ToImmediate(LOperand * op,const Representation & r)62   Immediate ToImmediate(LOperand* op, const Representation& r) const {
63     return Immediate(ToRepresentation(LConstantOperand::cast(op), r));
64   }
65   double ToDouble(LConstantOperand* op) const;
66 
67   Handle<Object> ToHandle(LConstantOperand* op) const;
68 
69   // The operand denoting the second word (the one with a higher address) of
70   // a double stack slot.
71   Operand HighOperand(LOperand* op);
72 
73   // Try to generate code for the entire chunk, but it may fail if the
74   // chunk contains constructs we cannot handle. Returns true if the
75   // code generation attempt succeeded.
76   bool GenerateCode();
77 
78   // Finish the code by setting stack height, safepoint, and bailout
79   // information on it.
80   void FinishCode(Handle<Code> code);
81 
82   // Deferred code support.
83   void DoDeferredNumberTagD(LNumberTagD* instr);
84 
85   enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
86   void DoDeferredNumberTagIU(LInstruction* instr,
87                              LOperand* value,
88                              LOperand* temp,
89                              IntegerSignedness signedness);
90 
91   void DoDeferredTaggedToI(LTaggedToI* instr, Label* done);
92   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
93   void DoDeferredStackCheck(LStackCheck* instr);
94   void DoDeferredMaybeGrowElements(LMaybeGrowElements* instr);
95   void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
96   void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
97   void DoDeferredAllocate(LAllocate* instr);
98   void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
99   void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
100                                    Register object,
101                                    Register index);
102 
103   // Parallel move support.
104   void DoParallelMove(LParallelMove* move);
105   void DoGap(LGap* instr);
106 
107   // Emit frame translation commands for an environment.
108   void WriteTranslation(LEnvironment* environment, Translation* translation);
109 
110   void EnsureRelocSpaceForDeoptimization();
111 
112   // Declare methods that deal with the individual node types.
113 #define DECLARE_DO(type) void Do##type(L##type* node);
LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)114   LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
115 #undef DECLARE_DO
116 
117  private:
118   Scope* scope() const { return scope_; }
119 
double_scratch0()120   XMMRegister double_scratch0() const { return xmm0; }
121 
122   void EmitClassOfTest(Label* if_true,
123                        Label* if_false,
124                        Handle<String> class_name,
125                        Register input,
126                        Register temporary,
127                        Register temporary2);
128 
HasAllocatedStackSlots()129   bool HasAllocatedStackSlots() const {
130     return chunk()->HasAllocatedStackSlots();
131   }
GetStackSlotCount()132   int GetStackSlotCount() const { return chunk()->GetSpillSlotCount(); }
GetTotalFrameSlotCount()133   int GetTotalFrameSlotCount() const {
134     return chunk()->GetTotalFrameSlotCount();
135   }
136 
AddDeferredCode(LDeferredCode * code)137   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
138 
139   void SaveCallerDoubles();
140   void RestoreCallerDoubles();
141 
142   // Code generation passes.  Returns true if code generation should
143   // continue.
144   void GenerateBodyInstructionPre(LInstruction* instr) override;
145   void GenerateBodyInstructionPost(LInstruction* instr) override;
146   bool GeneratePrologue();
147   bool GenerateDeferredCode();
148   bool GenerateJumpTable();
149   bool GenerateSafepointTable();
150 
151   // Generates the custom OSR entrypoint and sets the osr_pc_offset.
152   void GenerateOsrPrologue();
153 
154   enum SafepointMode {
155     RECORD_SIMPLE_SAFEPOINT,
156     RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS
157   };
158 
159   void CallCode(Handle<Code> code,
160                 RelocInfo::Mode mode,
161                 LInstruction* instr);
162 
163   void CallCodeGeneric(Handle<Code> code,
164                        RelocInfo::Mode mode,
165                        LInstruction* instr,
166                        SafepointMode safepoint_mode);
167 
168   void CallRuntime(const Runtime::Function* fun,
169                    int argc,
170                    LInstruction* instr,
171                    SaveFPRegsMode save_doubles = kDontSaveFPRegs);
172 
CallRuntime(Runtime::FunctionId id,int argc,LInstruction * instr)173   void CallRuntime(Runtime::FunctionId id,
174                    int argc,
175                    LInstruction* instr) {
176     const Runtime::Function* function = Runtime::FunctionForId(id);
177     CallRuntime(function, argc, instr);
178   }
179 
CallRuntime(Runtime::FunctionId id,LInstruction * instr)180   void CallRuntime(Runtime::FunctionId id, LInstruction* instr) {
181     const Runtime::Function* function = Runtime::FunctionForId(id);
182     CallRuntime(function, function->nargs, instr);
183   }
184 
185   void CallRuntimeFromDeferred(Runtime::FunctionId id,
186                                int argc,
187                                LInstruction* instr,
188                                LOperand* context);
189 
190   void LoadContextFromDeferred(LOperand* context);
191 
192   void PrepareForTailCall(const ParameterCount& actual, Register scratch1,
193                           Register scratch2, Register scratch3);
194 
195   // Generate a direct call to a known function. Expects the function
196   // to be in edi.
197   void CallKnownFunction(Handle<JSFunction> function,
198                          int formal_parameter_count, int arity,
199                          bool is_tail_call, LInstruction* instr);
200 
201   void RecordSafepointWithLazyDeopt(LInstruction* instr,
202                                     SafepointMode safepoint_mode);
203 
204   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
205                                             Safepoint::DeoptMode mode);
206   void DeoptimizeIf(Condition cc, LInstruction* instr,
207                     DeoptimizeReason deopt_reason,
208                     Deoptimizer::BailoutType bailout_type);
209   void DeoptimizeIf(Condition cc, LInstruction* instr,
210                     DeoptimizeReason deopt_reason);
211 
DeoptEveryNTimes()212   bool DeoptEveryNTimes() {
213     return FLAG_deopt_every_n_times != 0 && !info()->IsStub();
214   }
215 
216   void AddToTranslation(LEnvironment* environment,
217                         Translation* translation,
218                         LOperand* op,
219                         bool is_tagged,
220                         bool is_uint32,
221                         int* object_index_pointer,
222                         int* dematerialized_index_pointer);
223 
224   Register ToRegister(int index) const;
225   XMMRegister ToDoubleRegister(int index) const;
226   int32_t ToRepresentation(LConstantOperand* op, const Representation& r) const;
227   int32_t ToInteger32(LConstantOperand* op) const;
228   ExternalReference ToExternalReference(LConstantOperand* op) const;
229 
230   Operand BuildFastArrayOperand(LOperand* elements_pointer,
231                                 LOperand* key,
232                                 Representation key_representation,
233                                 ElementsKind elements_kind,
234                                 uint32_t base_offset);
235 
236   Operand BuildSeqStringOperand(Register string,
237                                 LOperand* index,
238                                 String::Encoding encoding);
239 
240   void EmitIntegerMathAbs(LMathAbs* instr);
241 
242   // Support for recording safepoint information.
243   void RecordSafepoint(LPointerMap* pointers,
244                        Safepoint::Kind kind,
245                        int arguments,
246                        Safepoint::DeoptMode mode);
247   void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
248   void RecordSafepoint(Safepoint::DeoptMode mode);
249   void RecordSafepointWithRegisters(LPointerMap* pointers,
250                                     int arguments,
251                                     Safepoint::DeoptMode mode);
252 
253   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
254   void EmitGoto(int block);
255 
256   // EmitBranch expects to be the last instruction of a block.
257   template<class InstrType>
258   void EmitBranch(InstrType instr, Condition cc);
259   template <class InstrType>
260   void EmitTrueBranch(InstrType instr, Condition cc);
261   template <class InstrType>
262   void EmitFalseBranch(InstrType instr, Condition cc);
263   void EmitNumberUntagD(LNumberUntagD* instr, Register input, Register temp,
264                         XMMRegister result, NumberUntagDMode mode);
265 
266   // Emits optimized code for typeof x == "y".  Modifies input register.
267   // Returns the condition on which a final split to
268   // true and false label should be made, to optimize fallthrough.
269   Condition EmitTypeofIs(LTypeofIsAndBranch* instr, Register input);
270 
271   // Emits optimized code for %_IsString(x).  Preserves input register.
272   // Returns the condition on which a final split to
273   // true and false label should be made, to optimize fallthrough.
274   Condition EmitIsString(Register input,
275                          Register temp1,
276                          Label* is_not_string,
277                          SmiCheck check_needed);
278 
279   // Emits optimized code to deep-copy the contents of statically known
280   // object graphs (e.g. object literal boilerplate).
281   void EmitDeepCopy(Handle<JSObject> object,
282                     Register result,
283                     Register source,
284                     int* offset,
285                     AllocationSiteMode mode);
286 
287   void EnsureSpaceForLazyDeopt(int space_needed) override;
288   void DoLoadKeyedExternalArray(LLoadKeyed* instr);
289   void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
290   void DoLoadKeyedFixedArray(LLoadKeyed* instr);
291   void DoStoreKeyedExternalArray(LStoreKeyed* instr);
292   void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
293   void DoStoreKeyedFixedArray(LStoreKeyed* instr);
294 
295   template <class T>
296   void EmitVectorLoadICRegisters(T* instr);
297 
298   void EmitReturn(LReturn* instr);
299 
300   // Emits code for pushing either a tagged constant, a (non-double)
301   // register, or a stack slot operand.
302   void EmitPushTaggedOperand(LOperand* operand);
303 
304   friend class LGapResolver;
305 
306 #ifdef _MSC_VER
307   // On windows, you may not access the stack more than one page below
308   // the most recently mapped page. To make the allocated area randomly
309   // accessible, we write an arbitrary value to each page in range
310   // esp + offset - page_size .. esp in turn.
311   void MakeSureStackPagesMapped(int offset);
312 #endif
313 
314   ZoneList<Deoptimizer::JumpTableEntry> jump_table_;
315   Scope* const scope_;
316   ZoneList<LDeferredCode*> deferred_;
317   bool frame_is_built_;
318 
319   // Builder that keeps track of safepoints in the code. The table
320   // itself is emitted at the end of the generated code.
321   SafepointTableBuilder safepoints_;
322 
323   // Compiler from a set of parallel moves to a sequential list of moves.
324   LGapResolver resolver_;
325 
326   Safepoint::Kind expected_safepoint_kind_;
327 
328   class PushSafepointRegistersScope final BASE_EMBEDDED {
329    public:
PushSafepointRegistersScope(LCodeGen * codegen)330     explicit PushSafepointRegistersScope(LCodeGen* codegen)
331         : codegen_(codegen) {
332       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
333       codegen_->masm_->PushSafepointRegisters();
334       codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
335       DCHECK(codegen_->info()->is_calling());
336     }
337 
~PushSafepointRegistersScope()338     ~PushSafepointRegistersScope() {
339       DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
340       codegen_->masm_->PopSafepointRegisters();
341       codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
342     }
343 
344    private:
345     LCodeGen* codegen_;
346   };
347 
348   friend class LDeferredCode;
349   friend class LEnvironment;
350   friend class SafepointGenerator;
351   DISALLOW_COPY_AND_ASSIGN(LCodeGen);
352 };
353 
354 
355 class LDeferredCode : public ZoneObject {
356  public:
LDeferredCode(LCodeGen * codegen)357   explicit LDeferredCode(LCodeGen* codegen)
358       : codegen_(codegen),
359         external_exit_(NULL),
360         instruction_index_(codegen->current_instruction_) {
361     codegen->AddDeferredCode(this);
362   }
363 
~LDeferredCode()364   virtual ~LDeferredCode() {}
365   virtual void Generate() = 0;
366   virtual LInstruction* instr() = 0;
367 
SetExit(Label * exit)368   void SetExit(Label* exit) { external_exit_ = exit; }
entry()369   Label* entry() { return &entry_; }
exit()370   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
done()371   Label* done() { return codegen_->NeedsDeferredFrame() ? &done_ : exit(); }
instruction_index()372   int instruction_index() const { return instruction_index_; }
373 
374  protected:
codegen()375   LCodeGen* codegen() const { return codegen_; }
masm()376   MacroAssembler* masm() const { return codegen_->masm(); }
377 
378  private:
379   LCodeGen* codegen_;
380   Label entry_;
381   Label exit_;
382   Label* external_exit_;
383   Label done_;
384   int instruction_index_;
385 };
386 
387 }  // namespace internal
388 }  // namespace v8
389 
390 #endif  // V8_CRANKSHAFT_IA32_LITHIUM_CODEGEN_IA32_H_
391