author | zmajo |
Tue, 28 Jul 2015 19:20:42 +0200 | |
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child 32085 | d869c505b624 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1999, 2014, 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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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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// The (closed set) of concrete compiler classes. |
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enum Type { |
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none, |
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c1, |
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c2, |
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shark |
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}; |
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private: |
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Type _type; |
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public: |
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AbstractCompiler(Type 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(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) and |
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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 second parameter, 'compilation_context', is needed to implement functionality |
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// related to the DisableIntrinsic command-line flag. The DisableIntrinsic flag can |
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// be used to prohibit the C2 compiler (but not the C1 compiler) to use an intrinsic. |
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// There are three ways to disable an intrinsic using the DisableIntrinsic flag: |
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// |
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// (1) -XX:DisableIntrinsic=_hashCode,_getClass |
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// Disables intrinsification of _hashCode and _getClass globally |
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// (i.e., the intrinsified version the methods will not be used at all). |
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// (2) -XX:CompileCommand=option,aClass::aMethod,ccstr,DisableIntrinsic,_hashCode |
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// Disables intrinsification of _hashCode if it is called from |
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// aClass::aMethod (but not for any other call site of _hashCode) |
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// (3) -XX:CompileCommand=option,java.lang.ref.Reference::get,ccstr,DisableIntrinsic,_Reference_get |
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// Some methods are not compiled by C2. Instead, the C2 compiler |
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// returns directly the intrinsified version of these methods. |
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// The command above forces C2 to compile _Reference_get, but |
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// allows using the intrinsified version of _Reference_get at all |
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// other call sites. |
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// |
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// From the modes above, (1) disable intrinsics globally, (2) and (3) |
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// disable intrinsics on a per-method basis. In cases (2) and (3) the |
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// compilation context is aClass::aMethod and java.lang.ref.Reference::get, |
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// respectively. |
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virtual bool is_intrinsic_available(methodHandle method, methodHandle compilation_context) { |
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return false; |
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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(methodHandle method) { |
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return false; |
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} |
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// Implements compiler-specific processing of command-line flags. |
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// Processing of command-line flags common to all compilers is implemented |
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// in vmIntrinsicss::is_disabled_by_flag. |
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virtual bool is_intrinsic_disabled_by_flag(methodHandle method) { |
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return false; |
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} |
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// Compiler type queries. |
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bool is_c1() { return _type == c1; } |
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bool is_c2() { return _type == c2; } |
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bool is_shark() { return _type == shark; } |
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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) { |
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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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}; |
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#endif // SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP |