/*

 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

class CompilationResourceObj;

class XHandlers;

class ExceptionInfo;

class DebugInformationRecorder;

class FrameMap;

class IR;

class IRScope;

class Instruction;

class LinearScan;

class OopMap;

class LIR_Emitter;

class LIR_Assembler;

class CodeEmitInfo;

class ciEnv;

class ciMethod;

class ValueStack;

class LIR_OprDesc;

class C1_MacroAssembler;

class CFGPrinter;

typedef LIR_OprDesc* LIR_Opr;

define_array(BasicTypeArray, BasicType)

define_stack(BasicTypeList, BasicTypeArray)

define_array(ExceptionInfoArray, ExceptionInfo*)

define_stack(ExceptionInfoList,  ExceptionInfoArray)

class Compilation: public StackObj {

  friend class CompilationResourceObj;

 private:

  // compilation specifics

  Arena* _arena;

  int _next_id;

  int _next_block_id;

  AbstractCompiler*  _compiler;

  ciEnv*             _env;

  ciMethod*          _method;

  int                _osr_bci;

  IR*                _hir;

  int                _max_spills;

  FrameMap*          _frame_map;

  C1_MacroAssembler* _masm;

  bool               _has_exception_handlers;

  bool               _has_fpu_code;

  bool               _has_unsafe_access;

  bool               _would_profile;

  bool               _has_method_handle_invokes;  // True if this method has MethodHandle invokes.

  const char*        _bailout_msg;

  ExceptionInfoList* _exception_info_list;

  ExceptionHandlerTable _exception_handler_table;

  ImplicitExceptionTable _implicit_exception_table;

  LinearScan*        _allocator;

  CodeOffsets        _offsets;

  CodeBuffer         _code;

  // compilation helpers

  void initialize();

  void build_hir();

  void emit_lir();

  void emit_code_epilog(LIR_Assembler* assembler);

  int  emit_code_body();

  int  compile_java_method();

  void install_code(int frame_size);

  void compile_method();

  void generate_exception_handler_table();

  ExceptionInfoList* exception_info_list() const { return _exception_info_list; }

  ExceptionHandlerTable* exception_handler_table() { return &_exception_handler_table; }

  LinearScan* allocator()                          { return _allocator;      }

  void        set_allocator(LinearScan* allocator) { _allocator = allocator; }

  Instruction*       _current_instruction;       // the instruction currently being processed

#ifndef PRODUCT

  Instruction*       _last_instruction_printed;  // the last instruction printed during traversal

#endif // PRODUCT

 public:

  // creation

  Compilation(AbstractCompiler* compiler, ciEnv* env, ciMethod* method,

              int osr_bci, BufferBlob* buffer_blob);

  ~Compilation();

  static Compilation* current() {

    return (Compilation*) ciEnv::current()->compiler_data();

  }

  // accessors

  ciEnv* env() const                             { return _env; }

  AbstractCompiler* compiler() const             { return _compiler; }

  bool has_exception_handlers() const            { return _has_exception_handlers; }

  bool has_fpu_code() const                      { return _has_fpu_code; }

  bool has_unsafe_access() const                 { return _has_unsafe_access; }

  ciMethod* method() const                       { return _method; }

  int osr_bci() const                            { return _osr_bci; }

  bool is_osr_compile() const                    { return osr_bci() >= 0; }

  IR* hir() const                                { return _hir; }

  int max_spills() const                         { return _max_spills; }

  FrameMap* frame_map() const                    { return _frame_map; }

  CodeBuffer* code()                             { return &_code; }

  C1_MacroAssembler* masm() const                { return _masm; }

  CodeOffsets* offsets()                         { return &_offsets; }

  Arena* arena()                                 { return _arena; }

  // Instruction ids

  int get_next_id()                              { return _next_id++; }

  int number_of_instructions() const             { return _next_id; }

  // BlockBegin ids

  int get_next_block_id()                        { return _next_block_id++; }

  int number_of_blocks() const                   { return _next_block_id; }

  // setters

  void set_has_exception_handlers(bool f)        { _has_exception_handlers = f; }

  void set_has_fpu_code(bool f)                  { _has_fpu_code = f; }

  void set_has_unsafe_access(bool f)             { _has_unsafe_access = f; }

  void set_would_profile(bool f)                 { _would_profile = f; }

  // Add a set of exception handlers covering the given PC offset

  void add_exception_handlers_for_pco(int pco, XHandlers* exception_handlers);

  // Statistics gathering

  void notice_inlined_method(ciMethod* method);

  // JSR 292

  bool     has_method_handle_invokes() const { return _has_method_handle_invokes;     }

  void set_has_method_handle_invokes(bool z) {        _has_method_handle_invokes = z; }

  DebugInformationRecorder* debug_info_recorder() const; // = _env->debug_info();

  Dependencies* dependency_recorder() const; // = _env->dependencies()

  ImplicitExceptionTable* implicit_exception_table()     { return &_implicit_exception_table; }

  Instruction* current_instruction() const       { return _current_instruction; }

  Instruction* set_current_instruction(Instruction* instr) {

    Instruction* previous = _current_instruction;

    _current_instruction = instr;

    return previous;

  }

#ifndef PRODUCT

  void maybe_print_current_instruction();

#endif // PRODUCT

  // error handling

  void bailout(const char* msg);

  bool bailed_out() const                        { return _bailout_msg != NULL; }

  const char* bailout_msg() const                { return _bailout_msg; }

  static int desired_max_code_buffer_size() {

#ifndef PPC

    return (int) NMethodSizeLimit;  // default 256K or 512K

#else

    // conditional branches on PPC are restricted to 16 bit signed

    return MAX2((unsigned int)NMethodSizeLimit,32*K);

#endif

  }

  static int desired_max_constant_size() {

#ifndef PPC

    return (int) NMethodSizeLimit / 10;  // about 25K

#else

    return (MAX2((unsigned int)NMethodSizeLimit, 32*K)) / 10;

#endif

  }

  static void setup_code_buffer(CodeBuffer* cb, int call_stub_estimate);

  // timers

  static void print_timers();

#ifndef PRODUCT

  // debugging support.

  // produces a file named c1compileonly in the current directory with

  // directives to compile only the current method and it's inlines.

  // The file can be passed to the command line option -XX:Flags=<filename>

  void compile_only_this_method();

  void compile_only_this_scope(outputStream* st, IRScope* scope);

  void exclude_this_method();

#endif // PRODUCT

  bool is_profiling() {

    return env()->comp_level() == CompLevel_full_profile ||

           env()->comp_level() == CompLevel_limited_profile;

  }

  bool count_invocations() { return is_profiling(); }

  bool count_backedges()   { return is_profiling(); }

  // Helpers for generation of profile information

  bool profile_branches() {

    return env()->comp_level() == CompLevel_full_profile &&

      C1UpdateMethodData && C1ProfileBranches;

  }

  bool profile_calls() {

    return env()->comp_level() == CompLevel_full_profile &&

      C1UpdateMethodData && C1ProfileCalls;

  }

  bool profile_inlined_calls() {

    return profile_calls() && C1ProfileInlinedCalls;

  }

  bool profile_checkcasts() {

    return env()->comp_level() == CompLevel_full_profile &&

      C1UpdateMethodData && C1ProfileCheckcasts;

  }

};

// Macro definitions for unified bailout-support

// The methods bailout() and bailed_out() are present in all classes

// that might bailout, but forward all calls to Compilation

#define BAILOUT(msg)               { bailout(msg); return;              }

#define BAILOUT_(msg, res)         { bailout(msg); return res;          }

#define CHECK_BAILOUT()            { if (bailed_out()) return;          }

#define CHECK_BAILOUT_(res)        { if (bailed_out()) return res;      }

class InstructionMark: public StackObj {

 private:

  Compilation* _compilation;

  Instruction*  _previous;

 public:

  InstructionMark(Compilation* compilation, Instruction* instr) {

    _compilation = compilation;

    _previous = _compilation->set_current_instruction(instr);

  }

  ~InstructionMark() {

    _compilation->set_current_instruction(_previous);

  }

};

//----------------------------------------------------------------------

// Base class for objects allocated by the compiler in the compilation arena

class CompilationResourceObj ALLOCATION_SUPER_CLASS_SPEC {

 public:

  void* operator new(size_t size) { return Compilation::current()->arena()->Amalloc(size); }

  void* operator new(size_t size, Arena* arena) {

    return arena->Amalloc(size);

  }

  void  operator delete(void* p) {} // nothing to do

};

//----------------------------------------------------------------------

// Class for aggregating exception handler information.

// Effectively extends XHandlers class with PC offset of

// potentially exception-throwing instruction.

// This class is used at the end of the compilation to build the

// ExceptionHandlerTable.

class ExceptionInfo: public CompilationResourceObj {

 private:

  int             _pco;                // PC of potentially exception-throwing instruction

  XHandlers*      _exception_handlers; // flat list of exception handlers covering this PC

 public:

  ExceptionInfo(int pco, XHandlers* exception_handlers)

    : _pco(pco)

    , _exception_handlers(exception_handlers)

  { }

  int pco()                                      { return _pco; }

  XHandlers* exception_handlers()                { return _exception_handlers; }

};