Support for MIPS in architecture independent files....

src/mips/codegen-mips.h

+// 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_MIPS_CODEGEN_MIPS_H_
+#define V8_MIPS_CODEGEN_MIPS_H_
+
+namespace v8 {
+namespace internal {
+
+// Forward declarations
+class DeferredCode;
+class RegisterAllocator;
+class RegisterFile;
+
+enum InitState { CONST_INIT, NOT_CONST_INIT };
+enum TypeofState { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };
+
+
+// -------------------------------------------------------------------------
+// Reference support
+
+// A reference is a C++ stack-allocated object that keeps an ECMA
+// reference on the execution stack while in scope. For variables
+// the reference is empty, indicating that it isn't necessary to
+// store state on the stack for keeping track of references to those.
+// For properties, we keep either one (named) or two (indexed) values
+// on the execution stack to represent the reference.
+
+class Reference BASE_EMBEDDED {
+ public:
+  // The values of the types is important, see size().
+  enum Type { ILLEGAL = -1, SLOT = 0, NAMED = 1, KEYED = 2 };
+  Reference(CodeGenerator* cgen, Expression* expression);
+  ~Reference();
+
+  Expression* expression() const { return expression_; }
+  Type type() const { return type_; }
+  void set_type(Type value) {
+    ASSERT(type_ == ILLEGAL);
+    type_ = value;
+  }
+
+  // The size the reference takes up on the stack.
+  int size() const { return (type_ == ILLEGAL) ? 0 : type_; }
+
+  bool is_illegal() const { return type_ == ILLEGAL; }
+  bool is_slot() const { return type_ == SLOT; }
+  bool is_property() const { return type_ == NAMED || type_ == KEYED; }
+
+  // Return the name.  Only valid for named property references.
+  Handle<String> GetName();
+
+  // Generate code to push the value of the reference on top of the
+  // expression stack.  The reference is expected to be already on top of
+  // the expression stack, and it is left in place with its value above it.
+  void GetValue();
+
+  // Generate code to push the value of a reference on top of the expression
+  // stack and then spill the stack frame.  This function is used temporarily
+  // while the code generator is being transformed.
+  inline void GetValueAndSpill();
+
+  // Generate code to store the value on top of the expression stack in the
+  // reference.  The reference is expected to be immediately below the value
+  // on the expression stack.  The stored value is left in place (with the
+  // reference intact below it) to support chained assignments.
+  void SetValue(InitState init_state);
+
+ private:
+  CodeGenerator* cgen_;
+  Expression* expression_;
+  Type type_;
+};
+
+
+// -------------------------------------------------------------------------
+// Code generation state
+
+// The state is passed down the AST by the code generator (and back up, in
+// the form of the state of the label pair).  It is threaded through the
+// call stack.  Constructing a state implicitly pushes it on the owning code
+// generator's stack of states, and destroying one implicitly pops it.
+
+class CodeGenState BASE_EMBEDDED {
+ public:
+  // Create an initial code generator state.  Destroying the initial state
+  // leaves the code generator with a NULL state.
+  explicit CodeGenState(CodeGenerator* owner);
+
+  // Create a code generator state based on a code generator's current
+  // state.  The new state has its own typeof state and pair of branch
+  // labels.
+  CodeGenState(CodeGenerator* owner,
+               JumpTarget* true_target,
+               JumpTarget* false_target);
+
+  // Destroy a code generator state and restore the owning code generator's
+  // previous state.
+  ~CodeGenState();
+
+  TypeofState typeof_state() const { return typeof_state_; }
+  JumpTarget* true_target() const { return true_target_; }
+  JumpTarget* false_target() const { return false_target_; }
+
+ private:
+  // The owning code generator.
+  CodeGenerator* owner_;
+
+  // A flag indicating whether we are compiling the immediate subexpression
+  // of a typeof expression.
+  TypeofState typeof_state_;
+
+  JumpTarget* true_target_;
+  JumpTarget* false_target_;
+
+  // The previous state of the owning code generator, restored when
+  // this state is destroyed.
+  CodeGenState* previous_;
+};
+
+
+
+// -------------------------------------------------------------------------
+// CodeGenerator
+
+class CodeGenerator: public AstVisitor {
+ public:
+  // Takes a function literal, generates code for it. This function should only
+  // be called by compiler.cc.
+  static Handle<Code> MakeCode(FunctionLiteral* fun,
+                               Handle<Script> script,
+                               bool is_eval);
+
+  // Printing of AST, etc. as requested by flags.
+  static void MakeCodePrologue(FunctionLiteral* fun);
+
+  // Allocate and install the code.
+  static Handle<Code> MakeCodeEpilogue(FunctionLiteral* fun,
+                                       MacroAssembler* masm,
+                                       Code::Flags flags,
+                                       Handle<Script> script);
+
+#ifdef ENABLE_LOGGING_AND_PROFILING
+  static bool ShouldGenerateLog(Expression* type);
+#endif
+
+  static void SetFunctionInfo(Handle<JSFunction> fun,
+                              FunctionLiteral* lit,
+                              bool is_toplevel,
+                              Handle<Script> script);
+
+  static void RecordPositions(MacroAssembler* masm, int pos);
+
+  // Accessors
+  MacroAssembler* masm() { return masm_; }
+  VirtualFrame* frame() const { return frame_; }
+  Handle<Script> script() { return script_; }
+
+  bool has_valid_frame() const { return frame_ != NULL; }
+
+  // Set the virtual frame to be new_frame, with non-frame register
+  // reference counts given by non_frame_registers.  The non-frame
+  // register reference counts of the old frame are returned in
+  // non_frame_registers.
+  void SetFrame(VirtualFrame* new_frame, RegisterFile* non_frame_registers);
+
+  void DeleteFrame();
+
+  RegisterAllocator* allocator() const { return allocator_; }
+
+  CodeGenState* state() { return state_; }
+  void set_state(CodeGenState* state) { state_ = state; }
+
+  void AddDeferred(DeferredCode* code) { deferred_.Add(code); }
+
+  static const int kUnknownIntValue = -1;
+
+  // Number of instructions used for the JS return sequence. The constant is
+  // used by the debugger to patch the JS return sequence.
+  static const int kJSReturnSequenceLength = 6;
+
+ private:
+  // Construction/Destruction
+  CodeGenerator(int buffer_size, Handle<Script> script, bool is_eval);
+  virtual ~CodeGenerator() { delete masm_; }
+
+  // Accessors
+  Scope* scope() const { return scope_; }
+
+  // Generating deferred code.
+  void ProcessDeferred();
+
+  bool is_eval() { return is_eval_; }
+
+  // State
+  bool has_cc() const  { return cc_reg_ != cc_always; }
+  TypeofState typeof_state() const { return state_->typeof_state(); }
+  JumpTarget* true_target() const  { return state_->true_target(); }
+  JumpTarget* false_target() const  { return state_->false_target(); }
+
+  // We don't track loop nesting level on mips yet.
+  int loop_nesting() const { return 0; }
+
+  // Node visitors.
+  void VisitStatements(ZoneList<Statement*>* statements);
+
+#define DEF_VISIT(type) \
+  void Visit##type(type* node);
+  AST_NODE_LIST(DEF_VISIT)
+#undef DEF_VISIT
+
+  // Visit a statement and then spill the virtual frame if control flow can
+  // reach the end of the statement (ie, it does not exit via break,
+  // continue, return, or throw).  This function is used temporarily while
+  // the code generator is being transformed.
+  inline void VisitAndSpill(Statement* statement);
+
+  // Visit a list of statements and then spill the virtual frame if control
+  // flow can reach the end of the list.
+  inline void VisitStatementsAndSpill(ZoneList<Statement*>* statements);
+
+  // Main code generation function
+  void GenCode(FunctionLiteral* fun);
+
+  // The following are used by class Reference.
+  void LoadReference(Reference* ref);
+  void UnloadReference(Reference* ref);
+
+  MemOperand ContextOperand(Register context, int index) const {
+    return MemOperand(context, Context::SlotOffset(index));
+  }
+
+  MemOperand SlotOperand(Slot* slot, Register tmp);
+
+  MemOperand ContextSlotOperandCheckExtensions(Slot* slot,
+                                               Register tmp,
+                                               Register tmp2,
+                                               JumpTarget* slow);
+
+  // Expressions
+  MemOperand GlobalObject() const  {
+    return ContextOperand(cp, Context::GLOBAL_INDEX);
+  }
+
+  void LoadCondition(Expression* x,
+                     JumpTarget* true_target,
+                     JumpTarget* false_target,
+                     bool force_cc);
+  void Load(Expression* x);
+  void LoadGlobal();
+  void LoadGlobalReceiver(Register scratch);
+
+  // Generate code to push the value of an expression on top of the frame
+  // and then spill the frame fully to memory.  This function is used
+  // temporarily while the code generator is being transformed.
+  inline void LoadAndSpill(Expression* expression);
+
+  // Call LoadCondition and then spill the virtual frame unless control flow
+  // cannot reach the end of the expression (ie, by emitting only
+  // unconditional jumps to the control targets).
+  inline void LoadConditionAndSpill(Expression* expression,
+                                    JumpTarget* true_target,
+                                    JumpTarget* false_target,
+                                    bool force_control);
+
+  // Read a value from a slot and leave it on top of the expression stack.
+  void LoadFromSlot(Slot* slot, TypeofState typeof_state);
+  void LoadFromGlobalSlotCheckExtensions(Slot* slot,
+                                         TypeofState typeof_state,
+                                         Register tmp,
+                                         Register tmp2,
+                                         JumpTarget* slow);
+
+  // Special code for typeof expressions: Unfortunately, we must
+  // be careful when loading the expression in 'typeof'
+  // expressions. We are not allowed to throw reference errors for
+  // non-existing properties of the global object, so we must make it
+  // look like an explicit property access, instead of an access
+  // through the context chain.
+  void LoadTypeofExpression(Expression* x);
+
+  void ToBoolean(JumpTarget* true_target, JumpTarget* false_target);
+
+  void GenericBinaryOperation(Token::Value op,
+                              OverwriteMode overwrite_mode,
+                              int known_rhs = kUnknownIntValue);
+  void Comparison(Condition cc,
+                  Expression* left,
+                  Expression* right,
+                  bool strict = false);
+
+  void SmiOperation(Token::Value op,
+                    Handle<Object> value,
+                    bool reversed,
+                    OverwriteMode mode);
+
+  void CallWithArguments(ZoneList<Expression*>* arguments, int position);
+
+  // Control flow
+  void Branch(bool if_true, JumpTarget* target);
+  void CheckStack();
+
+  struct InlineRuntimeLUT {
+    void (CodeGenerator::*method)(ZoneList<Expression*>*);
+    const char* name;
+  };
+
+  static InlineRuntimeLUT* FindInlineRuntimeLUT(Handle<String> name);
+  bool CheckForInlineRuntimeCall(CallRuntime* node);
+  static bool PatchInlineRuntimeEntry(Handle<String> name,
+                                      const InlineRuntimeLUT& new_entry,
+                                      InlineRuntimeLUT* old_entry);
+
+  static Handle<Code> ComputeLazyCompile(int argc);
+  void ProcessDeclarations(ZoneList<Declaration*>* declarations);
+
+  Handle<Code> ComputeCallInitialize(int argc, InLoopFlag in_loop);
+
+  // Declare global variables and functions in the given array of
+  // name/value pairs.
+  void DeclareGlobals(Handle<FixedArray> pairs);
+
+  // Instantiate the function boilerplate.
+  void InstantiateBoilerplate(Handle<JSFunction> boilerplate);
+
+  // Support for type checks.
+  void GenerateIsSmi(ZoneList<Expression*>* args);
+  void GenerateIsNonNegativeSmi(ZoneList<Expression*>* args);
+  void GenerateIsArray(ZoneList<Expression*>* args);
+
+  // Support for construct call checks.
+  void GenerateIsConstructCall(ZoneList<Expression*>* args);
+
+  // Support for arguments.length and arguments[?].
+  void GenerateArgumentsLength(ZoneList<Expression*>* args);
+  void GenerateArgumentsAccess(ZoneList<Expression*>* args);
+
+  // Support for accessing the class and value fields of an object.
+  void GenerateClassOf(ZoneList<Expression*>* args);
+  void GenerateValueOf(ZoneList<Expression*>* args);
+  void GenerateSetValueOf(ZoneList<Expression*>* args);
+
+  // Fast support for charCodeAt(n).
+  void GenerateFastCharCodeAt(ZoneList<Expression*>* args);
+
+  // Fast support for object equality testing.
+  void GenerateObjectEquals(ZoneList<Expression*>* args);
+
+  void GenerateLog(ZoneList<Expression*>* args);
+
+  // Fast support for Math.random().
+  void GenerateRandomPositiveSmi(ZoneList<Expression*>* args);
+
+  // Fast support for Math.sin and Math.cos.
+  enum MathOp { SIN, COS };
+  void GenerateFastMathOp(MathOp op, ZoneList<Expression*>* args);
+  inline void GenerateMathSin(ZoneList<Expression*>* args);
+  inline void GenerateMathCos(ZoneList<Expression*>* args);
+
+  // Simple condition analysis.
+  enum ConditionAnalysis {
+    ALWAYS_TRUE,
+    ALWAYS_FALSE,
+    DONT_KNOW
+  };
+  ConditionAnalysis AnalyzeCondition(Expression* cond);
+
+  // Methods used to indicate which source code is generated for. Source
+  // positions are collected by the assembler and emitted with the relocation
+  // information.
+  void CodeForFunctionPosition(FunctionLiteral* fun);
+  void CodeForReturnPosition(FunctionLiteral* fun);
+  void CodeForStatementPosition(Statement* node);
+  void CodeForSourcePosition(int pos);
+
+#ifdef DEBUG
+  // True if the registers are valid for entry to a block.
+  bool HasValidEntryRegisters();
+#endif
+
+  bool is_eval_;  // Tells whether code is generated for eval.
+
+  Handle<Script> script_;
+  List<DeferredCode*> deferred_;
+
+  // Assembler
+  MacroAssembler* masm_;  // to generate code
+
+  // Code generation state
+  Scope* scope_;
+  VirtualFrame* frame_;
+  RegisterAllocator* allocator_;
+  Condition cc_reg_;
+  CodeGenState* state_;
+
+  // Jump targets
+  BreakTarget function_return_;
+
+  // True if the function return is shadowed (ie, jumping to the target
+  // function_return_ does not jump to the true function return, but rather
+  // to some unlinking code).
+  bool function_return_is_shadowed_;
+
+  static InlineRuntimeLUT kInlineRuntimeLUT[];
+
+  friend class VirtualFrame;
+  friend class JumpTarget;
+  friend class Reference;
+  friend class FastCodeGenerator;
+  friend class CodeGenSelector;
+
+  DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
+};
+
+
+class GenericBinaryOpStub : public CodeStub {
+ public:
+  GenericBinaryOpStub(Token::Value op,
+                      OverwriteMode mode,
+                      int constant_rhs = CodeGenerator::kUnknownIntValue)
+      : op_(op),
+        mode_(mode),
+        constant_rhs_(constant_rhs),
+        specialized_on_rhs_(RhsIsOneWeWantToOptimizeFor(op, constant_rhs)) { }
+
+ private:
+  Token::Value op_;
+  OverwriteMode mode_;
+  int constant_rhs_;
+  bool specialized_on_rhs_;
+
+  static const int kMaxKnownRhs = 0x40000000;
+
+  // Minor key encoding in 16 bits.
+  class ModeBits: public BitField<OverwriteMode, 0, 2> {};
+  class OpBits: public BitField<Token::Value, 2, 6> {};
+  class KnownIntBits: public BitField<int, 8, 8> {};
+
+  Major MajorKey() { return GenericBinaryOp; }
+  int MinorKey() {
+//    // Encode the parameters in a unique 16 bit value.

[Søren Thygesen Gjesse, 2010/01/19 22:59:12]

Please remove code in comments.

[Alexandre, 2010/01/22 23:08:42]

Style issue fixed.
On 2010/01/19 22:59:12, Søren Gjesse wrote:

+//    return OpBits::encode(op_)
+//           | ModeBits::encode(mode_)
+//           | KnownIntBits::encode(MinorKeyForKnownInt());
+    return -1;   // UNIMPLEMENTED RETURN
+  }
+
+  void Generate(MacroAssembler* masm);
+  void HandleNonSmiBitwiseOp(MacroAssembler* masm);
+
+  static bool RhsIsOneWeWantToOptimizeFor(Token::Value op, int constant_rhs) {
+//    if (constant_rhs == CodeGenerator::kUnknownIntValue) return false;

[Søren Thygesen Gjesse, 2010/01/19 22:59:12]

Ditto.

[Alexandre, 2010/01/22 23:08:42]

Style issue fixed.
On 2010/01/19 22:59:12, Søren Gjesse wrote:

+//    if (op == Token::DIV) return constant_rhs >= 2 && constant_rhs <= 3;
+//    if (op == Token::MOD) {
+//      if (constant_rhs <= 1) return false;
+//      if (constant_rhs <= 10) return true;
+//      if (constant_rhs <= kMaxKnownRhs && IsPowerOf2(constant_rhs)) return true;
+//      return false;
+//    }
+//    return false;
+    return false;   // UNIMPLEMENTED RETURN
+  }
+
+  int MinorKeyForKnownInt() {
+//    if (!specialized_on_rhs_) return 0;

[Søren Thygesen Gjesse, 2010/01/19 22:59:12]

Ditto.

[Alexandre, 2010/01/22 23:08:42]

Style issue fixed.
On 2010/01/19 22:59:12, Søren Gjesse wrote:

+//    if (constant_rhs_ <= 10) return constant_rhs_ + 1;
+//    ASSERT(IsPowerOf2(constant_rhs_));
+//    int key = 12;
+//    int d = constant_rhs_;
+//    while ((d & 1) == 0) {
+//      key++;
+//      d >>= 1;
+//    }
+//    return key;
+    return -1;   // UNIMPLEMENTED RETURN
+  }
+
+  const char* GetName() {
+    switch (op_) {
+      case Token::ADD: return "GenericBinaryOpStub_ADD";
+      case Token::SUB: return "GenericBinaryOpStub_SUB";
+      case Token::MUL: return "GenericBinaryOpStub_MUL";
+      case Token::DIV: return "GenericBinaryOpStub_DIV";
+      case Token::MOD: return "GenericBinaryOpStub_MOD";
+      case Token::BIT_OR: return "GenericBinaryOpStub_BIT_OR";
+      case Token::BIT_AND: return "GenericBinaryOpStub_BIT_AND";
+      case Token::BIT_XOR: return "GenericBinaryOpStub_BIT_XOR";
+      case Token::SAR: return "GenericBinaryOpStub_SAR";
+      case Token::SHL: return "GenericBinaryOpStub_SHL";
+      case Token::SHR: return "GenericBinaryOpStub_SHR";
+      default:         return "GenericBinaryOpStub";
+    }
+  }
+
+#ifdef DEBUG
+  void Print() {
+//    if (!specialized_on_rhs_) {

[Søren Thygesen Gjesse, 2010/01/19 22:59:12]

Ditto.

[Alexandre, 2010/01/22 23:08:42]

Style issue fixed.
On 2010/01/19 22:59:12, Søren Gjesse wrote:

+//      PrintF("GenericBinaryOpStub (%s)\n", Token::String(op_));
+//    } else {
+//      PrintF("GenericBinaryOpStub (%s by %d)\n",
+//             Token::String(op_),
+//             constant_rhs_);
+//    }
+  }
+#endif
+};
+
+
+
+} }  // namespace v8::internal
+
+#endif  // V8_MIPS_CODEGEN_MIPS_H_