src/hotspot/share/compiler/abstractCompiler.hpp
author coleenp
Fri, 09 Mar 2018 20:01:38 -0500
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child 51333 f6641fcf7b7e
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8199283: Remove ValueObj class for allocation subclassing for compiler code Reviewed-by: stefank, tschatzl
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/*
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 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP
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#define SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP
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#include "ci/compilerInterface.hpp"
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#include "compiler/compilerDefinitions.hpp"
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#include "compiler/compilerDirectives.hpp"
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typedef void (*initializer)(void);
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#if INCLUDE_JVMCI
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// Per-compiler statistics
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class CompilerStatistics {
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  friend class VMStructs;
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  class Data {
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    friend class VMStructs;
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  public:
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    elapsedTimer _time;  // time spent compiling
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    int _bytes;          // number of bytecodes compiled, including inlined bytecodes
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    int _count;          // number of compilations
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    Data() : _bytes(0), _count(0) {}
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    void update(elapsedTimer time, int bytes) {
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      _time.add(time);
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      _bytes += bytes;
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      _count++;
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    }
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    void reset() {
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      _time.reset();
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    }
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  };
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 public:
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  Data _standard;  // stats for non-OSR compilations
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  Data _osr;       // stats for OSR compilations
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  int _nmethods_size; //
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  int _nmethods_code_size;
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  int bytes_per_second() {
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    int bytes = _standard._bytes + _osr._bytes;
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    if (bytes == 0) {
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      return 0;
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    }
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    double seconds = _standard._time.seconds() + _osr._time.seconds();
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    return seconds == 0.0 ? 0 : (int) (bytes / seconds);
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  }
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  CompilerStatistics() : _nmethods_size(0), _nmethods_code_size(0) {}
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};
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#endif // INCLUDE_JVMCI
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class AbstractCompiler : public CHeapObj<mtCompiler> {
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 private:
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  volatile int _num_compiler_threads;
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 protected:
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  volatile int _compiler_state;
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  // Used for tracking global state of compiler runtime initialization
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  enum { uninitialized, initializing, initialized, failed, shut_down };
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  // This method returns true for the first compiler thread that reaches that methods.
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  // This thread will initialize the compiler runtime.
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  bool should_perform_init();
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  const CompilerType _type;
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#if INCLUDE_JVMCI
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  CompilerStatistics _stats;
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#endif
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  AbstractCompiler(CompilerType type) : _type(type), _compiler_state(uninitialized), _num_compiler_threads(0) {}
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  // This function determines the compiler thread that will perform the
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  // shutdown of the corresponding compiler runtime.
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  bool should_perform_shutdown();
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  // Name of this compiler
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  virtual const char* name() = 0;
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  // Missing feature tests
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  virtual bool supports_native()                 { return true; }
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  virtual bool supports_osr   ()                 { return true; }
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  virtual bool can_compile_method(const methodHandle& method)  { return true; }
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  // Determine if the current compiler provides an intrinsic
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  // for method 'method'. An intrinsic is available if:
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  //  - the intrinsic is enabled (by using the appropriate command-line flag,
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  //    the command-line compile ommand, or a compiler directive)
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  //  - the platform on which the VM is running supports the intrinsic
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  //    (i.e., the platform provides the instructions necessary for the compiler
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  //    to generate the intrinsic code).
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  //
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  // The directive provides the compilation context and includes pre-evaluated values
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  // dependent on VM flags, compile commands, and compiler directives.
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  //
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  // Usually, the compilation context is the caller of the method 'method'.
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  // The only case when for a non-recursive method 'method' the compilation context
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  // is not the caller of the 'method' (but it is the method itself) is
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  // java.lang.ref.Referene::get.
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  // For java.lang.ref.Reference::get, the intrinsic version is used
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  // instead of the compiled version so that the value in the referent
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  // field can be registered by the G1 pre-barrier code. The intrinsified
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  // version of Reference::get also adds a memory barrier to prevent
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  // commoning reads from the referent field across safepoint since GC
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  // can change the referent field's value. See Compile::Compile()
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  // in src/share/vm/opto/compile.cpp or
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  // GraphBuilder::GraphBuilder() in src/share/vm/c1/c1_GraphBuilder.cpp
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  // for more details.
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  virtual bool is_intrinsic_available(const methodHandle& method, DirectiveSet* directive) {
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    return is_intrinsic_supported(method) &&
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           !directive->is_intrinsic_disabled(method) &&
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           !vmIntrinsics::is_disabled_by_flags(method);
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  }
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  // Determines if an intrinsic is supported by the compiler, that is,
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  // the compiler provides the instructions necessary to generate
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  // the intrinsic code for method 'method'.
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  //
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  // The 'is_intrinsic_supported' method is a white list, that is,
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  // by default no intrinsics are supported by a compiler except
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  // the ones listed in the method. Overriding methods should conform
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  // to this behavior.
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  virtual bool is_intrinsic_supported(const methodHandle& method) {
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    return false;
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  }
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  // Compiler type queries.
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  const bool is_c1()                             { return _type == compiler_c1; }
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  const bool is_c2()                             { return _type == compiler_c2; }
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  const bool is_jvmci()                          { return _type == compiler_jvmci; }
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  const CompilerType type()                      { return _type; }
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  // Extra tests to identify trivial methods for the tiered compilation policy.
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  virtual bool is_trivial(Method* method) { return false; }
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  // Customization
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  virtual void initialize () = 0;
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  void set_num_compiler_threads(int num) { _num_compiler_threads = num;  }
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  int num_compiler_threads()             { return _num_compiler_threads; }
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  // Get/set state of compiler objects
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  bool is_initialized()           { return _compiler_state == initialized; }
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  bool is_failed     ()           { return _compiler_state == failed;}
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  void set_state     (int state);
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  void set_shut_down ()           { set_state(shut_down); }
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  // Compilation entry point for methods
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  virtual void compile_method(ciEnv* env, ciMethod* target, int entry_bci, DirectiveSet* directive) {
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    ShouldNotReachHere();
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  }
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  // Print compilation timers and statistics
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  virtual void print_timers() {
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    ShouldNotReachHere();
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  }
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#if INCLUDE_JVMCI
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  CompilerStatistics* stats() { return &_stats; }
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#endif
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};
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#endif // SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP