MIPS port initial commit

src/mips/codegen-mips.h

+// Copyright 2010 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 CompilationInfo;
+class DeferredCode;
+class RegisterAllocator;
+class RegisterFile;
+
+enum InitState { CONST_INIT, NOT_CONST_INIT };
+enum TypeofState { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };
+
+
+// -------------------------------------------------------------------------
+// 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:
+  // Compilation mode.  Either the compiler is used as the primary
+  // compiler and needs to setup everything or the compiler is used as
+  // the secondary compiler for split compilation and has to handle
+  // bailouts.
+  enum Mode {
+    PRIMARY,
+    SECONDARY
+  };
+
+  // Takes a function literal, generates code for it. This function should only
+  // be called by compiler.cc.
+  static Handle<Code> MakeCode(CompilationInfo* info);
+
+  // Printing of AST, etc. as requested by flags.
+  static void MakeCodePrologue(CompilationInfo* info);
+
+  // Allocate and install the code.
+  static Handle<Code> MakeCodeEpilogue(MacroAssembler* masm,
+                                       Code::Flags flags,
+                                       CompilationInfo* info);
+
+#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_; }
+  inline Handle<Script> 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.
+  explicit CodeGenerator(MacroAssembler* masm);
+  virtual ~CodeGenerator() { delete masm_; }
+
+  // Accessors.
+  inline bool is_eval();
+  Scope* scope() const { return scope_; }
+
+  // Generating deferred code.
+  void ProcessDeferred();
+
+  // 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
+
+  // Main code generation function
+  void Generate(CompilationInfo* info, Mode mode);
+
+  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);
+
+  // 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);
+
+  void GenerateIsObject(ZoneList<Expression*>* args);
+  void GenerateIsFunction(ZoneList<Expression*>* args);
+  void GenerateIsUndetectableObject(ZoneList<Expression*>* args);
+  void GenerateStringAdd(ZoneList<Expression*>* args);
+  void GenerateSubString(ZoneList<Expression*>* args);
+  void GenerateStringCompare(ZoneList<Expression*>* args);
+  void GenerateRegExpExec(ZoneList<Expression*>* args);
+
+  // Fast support for Math.sin and Math.cos.
+  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 CodeForDoWhileConditionPosition(DoWhileStatement* stmt);
+  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
+
+  CompilationInfo* info_;
+
+  // 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 FullCodeGenSyntaxChecker;
+
+  DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
+};
+
+
+} }  // namespace v8::internal
+
+#endif  // V8_MIPS_CODEGEN_MIPS_H_
+