| // Copyright 2006-2008 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef V8_CODEGEN_H_ |
| #define V8_CODEGEN_H_ |
| |
| #include "ast.h" |
| #include "code-stubs.h" |
| #include "runtime.h" |
| #include "number-info.h" |
| |
| // Include the declaration of the architecture defined class CodeGenerator. |
| // The contract to the shared code is that the the CodeGenerator is a subclass |
| // of Visitor and that the following methods are available publicly: |
| // MakeCode |
| // MakeCodePrologue |
| // MakeCodeEpilogue |
| // masm |
| // frame |
| // script |
| // has_valid_frame |
| // SetFrame |
| // DeleteFrame |
| // allocator |
| // AddDeferred |
| // in_spilled_code |
| // set_in_spilled_code |
| // RecordPositions |
| // |
| // These methods are either used privately by the shared code or implemented as |
| // shared code: |
| // CodeGenerator |
| // ~CodeGenerator |
| // ProcessDeferred |
| // Generate |
| // ComputeLazyCompile |
| // BuildBoilerplate |
| // ComputeCallInitialize |
| // ComputeCallInitializeInLoop |
| // ProcessDeclarations |
| // DeclareGlobals |
| // FindInlineRuntimeLUT |
| // CheckForInlineRuntimeCall |
| // PatchInlineRuntimeEntry |
| // AnalyzeCondition |
| // CodeForFunctionPosition |
| // CodeForReturnPosition |
| // CodeForStatementPosition |
| // CodeForDoWhileConditionPosition |
| // CodeForSourcePosition |
| |
| |
| // Mode to overwrite BinaryExpression values. |
| enum OverwriteMode { NO_OVERWRITE, OVERWRITE_LEFT, OVERWRITE_RIGHT }; |
| |
| // Types of uncatchable exceptions. |
| enum UncatchableExceptionType { OUT_OF_MEMORY, TERMINATION }; |
| |
| |
| #if V8_TARGET_ARCH_IA32 |
| #include "ia32/codegen-ia32.h" |
| #elif V8_TARGET_ARCH_X64 |
| #include "x64/codegen-x64.h" |
| #elif V8_TARGET_ARCH_ARM |
| #include "arm/codegen-arm.h" |
| #elif V8_TARGET_ARCH_MIPS |
| #include "mips/codegen-mips.h" |
| #else |
| #error Unsupported target architecture. |
| #endif |
| |
| #include "register-allocator.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| // Support for "structured" code comments. |
| #ifdef DEBUG |
| |
| class Comment BASE_EMBEDDED { |
| public: |
| Comment(MacroAssembler* masm, const char* msg); |
| ~Comment(); |
| |
| private: |
| MacroAssembler* masm_; |
| const char* msg_; |
| }; |
| |
| #else |
| |
| class Comment BASE_EMBEDDED { |
| public: |
| Comment(MacroAssembler*, const char*) {} |
| }; |
| |
| #endif // DEBUG |
| |
| |
| // Code generation can be nested. Code generation scopes form a stack |
| // of active code generators. |
| class CodeGeneratorScope BASE_EMBEDDED { |
| public: |
| explicit CodeGeneratorScope(CodeGenerator* cgen) { |
| previous_ = top_; |
| top_ = cgen; |
| } |
| |
| ~CodeGeneratorScope() { |
| top_ = previous_; |
| } |
| |
| static CodeGenerator* Current() { |
| ASSERT(top_ != NULL); |
| return top_; |
| } |
| |
| private: |
| static CodeGenerator* top_; |
| CodeGenerator* previous_; |
| }; |
| |
| |
| // Deferred code objects are small pieces of code that are compiled |
| // out of line. They are used to defer the compilation of uncommon |
| // paths thereby avoiding expensive jumps around uncommon code parts. |
| class DeferredCode: public ZoneObject { |
| public: |
| DeferredCode(); |
| virtual ~DeferredCode() { } |
| |
| virtual void Generate() = 0; |
| |
| MacroAssembler* masm() { return masm_; } |
| |
| int statement_position() const { return statement_position_; } |
| int position() const { return position_; } |
| |
| Label* entry_label() { return &entry_label_; } |
| Label* exit_label() { return &exit_label_; } |
| |
| #ifdef DEBUG |
| void set_comment(const char* comment) { comment_ = comment; } |
| const char* comment() const { return comment_; } |
| #else |
| void set_comment(const char* comment) { } |
| const char* comment() const { return ""; } |
| #endif |
| |
| inline void Jump(); |
| inline void Branch(Condition cc); |
| void BindExit() { masm_->bind(&exit_label_); } |
| |
| void SaveRegisters(); |
| void RestoreRegisters(); |
| |
| protected: |
| MacroAssembler* masm_; |
| |
| private: |
| // Constants indicating special actions. They should not be multiples |
| // of kPointerSize so they will not collide with valid offsets from |
| // the frame pointer. |
| static const int kIgnore = -1; |
| static const int kPush = 1; |
| |
| // This flag is ored with a valid offset from the frame pointer, so |
| // it should fit in the low zero bits of a valid offset. |
| static const int kSyncedFlag = 2; |
| |
| int statement_position_; |
| int position_; |
| |
| Label entry_label_; |
| Label exit_label_; |
| |
| int registers_[RegisterAllocator::kNumRegisters]; |
| |
| #ifdef DEBUG |
| const char* comment_; |
| #endif |
| DISALLOW_COPY_AND_ASSIGN(DeferredCode); |
| }; |
| |
| class StackCheckStub : public CodeStub { |
| public: |
| StackCheckStub() { } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| |
| const char* GetName() { return "StackCheckStub"; } |
| |
| Major MajorKey() { return StackCheck; } |
| int MinorKey() { return 0; } |
| }; |
| |
| |
| class FastNewClosureStub : public CodeStub { |
| public: |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| const char* GetName() { return "FastNewClosureStub"; } |
| Major MajorKey() { return FastNewClosure; } |
| int MinorKey() { return 0; } |
| }; |
| |
| |
| class FastNewContextStub : public CodeStub { |
| public: |
| static const int kMaximumSlots = 64; |
| |
| explicit FastNewContextStub(int slots) : slots_(slots) { |
| ASSERT(slots_ > 0 && slots <= kMaximumSlots); |
| } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| int slots_; |
| |
| const char* GetName() { return "FastNewContextStub"; } |
| Major MajorKey() { return FastNewContext; } |
| int MinorKey() { return slots_; } |
| }; |
| |
| |
| class FastCloneShallowArrayStub : public CodeStub { |
| public: |
| static const int kMaximumLength = 8; |
| |
| explicit FastCloneShallowArrayStub(int length) : length_(length) { |
| ASSERT(length >= 0 && length <= kMaximumLength); |
| } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| int length_; |
| |
| const char* GetName() { return "FastCloneShallowArrayStub"; } |
| Major MajorKey() { return FastCloneShallowArray; } |
| int MinorKey() { return length_; } |
| }; |
| |
| |
| class InstanceofStub: public CodeStub { |
| public: |
| InstanceofStub() { } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| Major MajorKey() { return Instanceof; } |
| int MinorKey() { return 0; } |
| }; |
| |
| |
| class GenericUnaryOpStub : public CodeStub { |
| public: |
| GenericUnaryOpStub(Token::Value op, bool overwrite) |
| : op_(op), overwrite_(overwrite) { } |
| |
| private: |
| Token::Value op_; |
| bool overwrite_; |
| |
| class OverwriteField: public BitField<int, 0, 1> {}; |
| class OpField: public BitField<Token::Value, 1, kMinorBits - 1> {}; |
| |
| Major MajorKey() { return GenericUnaryOp; } |
| int MinorKey() { |
| return OpField::encode(op_) | OverwriteField::encode(overwrite_); |
| } |
| |
| void Generate(MacroAssembler* masm); |
| |
| const char* GetName(); |
| }; |
| |
| |
| enum NaNInformation { |
| kBothCouldBeNaN, |
| kCantBothBeNaN |
| }; |
| |
| |
| class CompareStub: public CodeStub { |
| public: |
| CompareStub(Condition cc, |
| bool strict, |
| NaNInformation nan_info = kBothCouldBeNaN) : |
| cc_(cc), strict_(strict), never_nan_nan_(nan_info == kCantBothBeNaN) { } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| Condition cc_; |
| bool strict_; |
| // Only used for 'equal' comparisons. Tells the stub that we already know |
| // that at least one side of the comparison is not NaN. This allows the |
| // stub to use object identity in the positive case. We ignore it when |
| // generating the minor key for other comparisons to avoid creating more |
| // stubs. |
| bool never_nan_nan_; |
| |
| Major MajorKey() { return Compare; } |
| |
| int MinorKey(); |
| |
| // Branch to the label if the given object isn't a symbol. |
| void BranchIfNonSymbol(MacroAssembler* masm, |
| Label* label, |
| Register object, |
| Register scratch); |
| |
| // Unfortunately you have to run without snapshots to see most of these |
| // names in the profile since most compare stubs end up in the snapshot. |
| const char* GetName(); |
| #ifdef DEBUG |
| void Print() { |
| PrintF("CompareStub (cc %d), (strict %s)\n", |
| static_cast<int>(cc_), |
| strict_ ? "true" : "false"); |
| } |
| #endif |
| }; |
| |
| |
| class CEntryStub : public CodeStub { |
| public: |
| explicit CEntryStub(int result_size, |
| ExitFrame::Mode mode = ExitFrame::MODE_NORMAL) |
| : result_size_(result_size), mode_(mode) { } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| void GenerateCore(MacroAssembler* masm, |
| Label* throw_normal_exception, |
| Label* throw_termination_exception, |
| Label* throw_out_of_memory_exception, |
| bool do_gc, |
| bool always_allocate_scope); |
| void GenerateThrowTOS(MacroAssembler* masm); |
| void GenerateThrowUncatchable(MacroAssembler* masm, |
| UncatchableExceptionType type); |
| |
| // Number of pointers/values returned. |
| const int result_size_; |
| const ExitFrame::Mode mode_; |
| |
| // Minor key encoding |
| class ExitFrameModeBits: public BitField<ExitFrame::Mode, 0, 1> {}; |
| class IndirectResultBits: public BitField<bool, 1, 1> {}; |
| |
| Major MajorKey() { return CEntry; } |
| // Minor key must differ if different result_size_ values means different |
| // code is generated. |
| int MinorKey(); |
| |
| const char* GetName() { return "CEntryStub"; } |
| }; |
| |
| |
| class ApiGetterEntryStub : public CodeStub { |
| public: |
| ApiGetterEntryStub(Handle<AccessorInfo> info, |
| ApiFunction* fun) |
| : info_(info), |
| fun_(fun) { } |
| void Generate(MacroAssembler* masm); |
| virtual bool has_custom_cache() { return true; } |
| virtual bool GetCustomCache(Code** code_out); |
| virtual void SetCustomCache(Code* value); |
| |
| static const int kStackSpace = 6; |
| static const int kArgc = 4; |
| private: |
| Handle<AccessorInfo> info() { return info_; } |
| ApiFunction* fun() { return fun_; } |
| Major MajorKey() { return NoCache; } |
| int MinorKey() { return 0; } |
| const char* GetName() { return "ApiEntryStub"; } |
| // The accessor info associated with the function. |
| Handle<AccessorInfo> info_; |
| // The function to be called. |
| ApiFunction* fun_; |
| }; |
| |
| |
| class JSEntryStub : public CodeStub { |
| public: |
| JSEntryStub() { } |
| |
| void Generate(MacroAssembler* masm) { GenerateBody(masm, false); } |
| |
| protected: |
| void GenerateBody(MacroAssembler* masm, bool is_construct); |
| |
| private: |
| Major MajorKey() { return JSEntry; } |
| int MinorKey() { return 0; } |
| |
| const char* GetName() { return "JSEntryStub"; } |
| }; |
| |
| |
| class JSConstructEntryStub : public JSEntryStub { |
| public: |
| JSConstructEntryStub() { } |
| |
| void Generate(MacroAssembler* masm) { GenerateBody(masm, true); } |
| |
| private: |
| int MinorKey() { return 1; } |
| |
| const char* GetName() { return "JSConstructEntryStub"; } |
| }; |
| |
| |
| class ArgumentsAccessStub: public CodeStub { |
| public: |
| enum Type { |
| READ_LENGTH, |
| READ_ELEMENT, |
| NEW_OBJECT |
| }; |
| |
| explicit ArgumentsAccessStub(Type type) : type_(type) { } |
| |
| private: |
| Type type_; |
| |
| Major MajorKey() { return ArgumentsAccess; } |
| int MinorKey() { return type_; } |
| |
| void Generate(MacroAssembler* masm); |
| void GenerateReadLength(MacroAssembler* masm); |
| void GenerateReadElement(MacroAssembler* masm); |
| void GenerateNewObject(MacroAssembler* masm); |
| |
| const char* GetName() { return "ArgumentsAccessStub"; } |
| |
| #ifdef DEBUG |
| void Print() { |
| PrintF("ArgumentsAccessStub (type %d)\n", type_); |
| } |
| #endif |
| }; |
| |
| |
| class RegExpExecStub: public CodeStub { |
| public: |
| RegExpExecStub() { } |
| |
| private: |
| Major MajorKey() { return RegExpExec; } |
| int MinorKey() { return 0; } |
| |
| void Generate(MacroAssembler* masm); |
| |
| const char* GetName() { return "RegExpExecStub"; } |
| |
| #ifdef DEBUG |
| void Print() { |
| PrintF("RegExpExecStub\n"); |
| } |
| #endif |
| }; |
| |
| |
| class CallFunctionStub: public CodeStub { |
| public: |
| CallFunctionStub(int argc, InLoopFlag in_loop, CallFunctionFlags flags) |
| : argc_(argc), in_loop_(in_loop), flags_(flags) { } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| int argc_; |
| InLoopFlag in_loop_; |
| CallFunctionFlags flags_; |
| |
| #ifdef DEBUG |
| void Print() { |
| PrintF("CallFunctionStub (args %d, in_loop %d, flags %d)\n", |
| argc_, |
| static_cast<int>(in_loop_), |
| static_cast<int>(flags_)); |
| } |
| #endif |
| |
| // Minor key encoding in 31 bits AAAAAAAAAAAAAAAAAAAAAFI A(rgs)F(lag)I(nloop). |
| class InLoopBits: public BitField<InLoopFlag, 0, 1> {}; |
| class FlagBits: public BitField<CallFunctionFlags, 1, 1> {}; |
| class ArgcBits: public BitField<int, 2, 29> {}; |
| |
| Major MajorKey() { return CallFunction; } |
| int MinorKey() { |
| // Encode the parameters in a unique 31 bit value. |
| return InLoopBits::encode(in_loop_) |
| | FlagBits::encode(flags_) |
| | ArgcBits::encode(argc_); |
| } |
| |
| InLoopFlag InLoop() { return in_loop_; } |
| bool ReceiverMightBeValue() { |
| return (flags_ & RECEIVER_MIGHT_BE_VALUE) != 0; |
| } |
| |
| public: |
| static int ExtractArgcFromMinorKey(int minor_key) { |
| return ArgcBits::decode(minor_key); |
| } |
| }; |
| |
| |
| class ToBooleanStub: public CodeStub { |
| public: |
| ToBooleanStub() { } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| Major MajorKey() { return ToBoolean; } |
| int MinorKey() { return 0; } |
| }; |
| |
| |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_CODEGEN_H_ |