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+// 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 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
+//   SetFunctionInfo
+//   masm
+//   frame
+//   has_valid_frame
+//   SetFrame
+//   DeleteFrame
+//   allocator
+//   AddDeferred
+//   in_spilled_code
+//   set_in_spilled_code
+//
+// These methods are either used privately by the shared code or implemented as
+// shared code:
+//   CodeGenerator
+//   ~CodeGenerator
+//   ProcessDeferred
+//   GenCode
+//   BuildBoilerplate
+//   ComputeCallInitialize
+//   ComputeCallInitializeInLoop
+//   ProcessDeclarations
+//   DeclareGlobals
+//   FindInlineRuntimeLUT
+//   CheckForInlineRuntimeCall
+//   PatchInlineRuntimeEntry
+//   CodeForFunctionPosition
+//   CodeForReturnPosition
+//   CodeForStatementPosition
+//   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"
+#else
+#error Unsupported target architecture.
+#endif
+
+#include "register-allocator.h"
+
+namespace v8 {
+namespace internal {
+
+
+// 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);
+};
+
+
+// RuntimeStub models code stubs calling entry points in the Runtime class.
+class RuntimeStub : public CodeStub {
+ public:
+  explicit RuntimeStub(Runtime::FunctionId id, int num_arguments)
+      : id_(id), num_arguments_(num_arguments) { }
+
+  void Generate(MacroAssembler* masm);
+
+  // Disassembler support.  It is useful to be able to print the name
+  // of the runtime function called through this stub.
+  static const char* GetNameFromMinorKey(int minor_key) {
+    return Runtime::FunctionForId(IdField::decode(minor_key))->stub_name;
+  }
+
+ private:
+  Runtime::FunctionId id_;
+  int num_arguments_;
+
+  class ArgumentField: public BitField<int,  0, 16> {};
+  class IdField: public BitField<Runtime::FunctionId, 16, kMinorBits - 16> {};
+
+  Major MajorKey() { return Runtime; }
+  int MinorKey() {
+    return IdField::encode(id_) | ArgumentField::encode(num_arguments_);
+  }
+
+  const char* GetName();
+
+#ifdef DEBUG
+  void Print() {
+    PrintF("RuntimeStub (id %s)\n", Runtime::FunctionForId(id_)->name);
+  }
+#endif
+};
+
+
+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 InstanceofStub: public CodeStub {
+ public:
+  InstanceofStub() { }
+
+  void Generate(MacroAssembler* masm);
+
+ private:
+  Major MajorKey() { return Instanceof; }
+  int MinorKey() { return 0; }
+};
+
+
+class UnarySubStub : public CodeStub {
+ public:
+  explicit UnarySubStub(bool overwrite)
+      : overwrite_(overwrite) { }
+
+ private:
+  bool overwrite_;
+  Major MajorKey() { return UnarySub; }
+  int MinorKey() { return overwrite_ ? 1 : 0; }
+  void Generate(MacroAssembler* masm);
+
+  const char* GetName() { return "UnarySubStub"; }
+};
+
+
+class CompareStub: public CodeStub {
+ public:
+  CompareStub(Condition cc, bool strict) : cc_(cc), strict_(strict) { }
+
+  void Generate(MacroAssembler* masm);
+
+ private:
+  Condition cc_;
+  bool strict_;
+
+  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);
+
+#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) : result_size_(result_size) { }
+
+  void Generate(MacroAssembler* masm) { GenerateBody(masm, false); }
+
+ protected:
+  void GenerateBody(MacroAssembler* masm, bool is_debug_break);
+  void GenerateCore(MacroAssembler* masm,
+                    Label* throw_normal_exception,
+                    Label* throw_termination_exception,
+                    Label* throw_out_of_memory_exception,
+                    StackFrame::Type frame_type,
+                    bool do_gc,
+                    bool always_allocate_scope);
+  void GenerateThrowTOS(MacroAssembler* masm);
+  void GenerateThrowUncatchable(MacroAssembler* masm,
+                                UncatchableExceptionType type);
+ private:
+  // Number of pointers/values returned.
+  int result_size_;
+
+  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 CEntryDebugBreakStub : public CEntryStub {
+ public:
+  CEntryDebugBreakStub() : CEntryStub(1) { }
+
+  void Generate(MacroAssembler* masm) { GenerateBody(masm, true); }
+
+ private:
+  int MinorKey() { return 1; }
+
+  const char* GetName() { return "CEntryDebugBreakStub"; }
+};
+
+
+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
+};
+
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_CODEGEN_H_