58 // shutdown of the corresponding compiler runtime.
59 bool should_perform_shutdown();
60
61 // Name of this compiler
62 virtual const char* name() = 0;
63
64 // Missing feature tests
65 virtual bool supports_native() { return true; }
66 virtual bool supports_osr () { return true; }
67 virtual bool can_compile_method(methodHandle method) { return true; }
68
69 // Determine if the current compiler provides an intrinsic
70 // for method 'method'. An intrinsic is available if:
71 // - the intrinsic is enabled (by using the appropriate command-line flag) and
72 // - the platform on which the VM is running supports the intrinsic
73 // (i.e., the platform provides the instructions necessary for the compiler
74 // to generate the intrinsic code).
75 //
76 // The second parameter, 'compilation_context', is needed to implement functionality
77 // related to the DisableIntrinsic command-line flag. The DisableIntrinsic flag can
78 // be used to prohibit the C2 compiler (but not the C1 compiler) to use an intrinsic.
79 // There are three ways to disable an intrinsic using the DisableIntrinsic flag:
80 //
81 // (1) -XX:DisableIntrinsic=_hashCode,_getClass
82 // Disables intrinsification of _hashCode and _getClass globally
83 // (i.e., the intrinsified version the methods will not be used at all).
84 // (2) -XX:CompileCommand=option,aClass::aMethod,ccstr,DisableIntrinsic,_hashCode
85 // Disables intrinsification of _hashCode if it is called from
86 // aClass::aMethod (but not for any other call site of _hashCode)
87 // (3) -XX:CompileCommand=option,java.lang.ref.Reference::get,ccstr,DisableIntrinsic,_Reference_get
88 // Some methods are not compiled by C2. Instead, the C2 compiler
89 // returns directly the intrinsified version of these methods.
90 // The command above forces C2 to compile _Reference_get, but
91 // allows using the intrinsified version of _Reference_get at all
92 // other call sites.
93 //
94 // From the modes above, (1) disable intrinsics globally, (2) and (3)
95 // disable intrinsics on a per-method basis. In cases (2) and (3) the
96 // compilation context is aClass::aMethod and java.lang.ref.Reference::get,
97 // respectively.
98 virtual bool is_intrinsic_available(methodHandle method, methodHandle compilation_context) {
99 return false;
100 }
101
102 // Determines if an intrinsic is supported by the compiler, that is,
103 // the compiler provides the instructions necessary to generate
104 // the intrinsic code for method 'method'.
105 //
106 // The 'is_intrinsic_supported' method is a white list, that is,
107 // by default no intrinsics are supported by a compiler except
108 // the ones listed in the method. Overriding methods should conform
109 // to this behavior.
110 virtual bool is_intrinsic_supported(methodHandle method) {
111 return false;
112 }
113
114 // Implements compiler-specific processing of command-line flags.
115 // Processing of command-line flags common to all compilers is implemented
116 // in vmIntrinsicss::is_disabled_by_flag.
117 virtual bool is_intrinsic_disabled_by_flag(methodHandle method) {
118 return false;
119 }
120
121 // Compiler type queries.
122 bool is_c1() { return _type == c1; }
123 bool is_c2() { return _type == c2; }
124 bool is_shark() { return _type == shark; }
125
126 // Customization
127 virtual void initialize () = 0;
128
129 void set_num_compiler_threads(int num) { _num_compiler_threads = num; }
130 int num_compiler_threads() { return _num_compiler_threads; }
131
132 // Get/set state of compiler objects
133 bool is_initialized() { return _compiler_state == initialized; }
134 bool is_failed () { return _compiler_state == failed;}
135 void set_state (int state);
136 void set_shut_down () { set_state(shut_down); }
137 // Compilation entry point for methods
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58 // shutdown of the corresponding compiler runtime.
59 bool should_perform_shutdown();
60
61 // Name of this compiler
62 virtual const char* name() = 0;
63
64 // Missing feature tests
65 virtual bool supports_native() { return true; }
66 virtual bool supports_osr () { return true; }
67 virtual bool can_compile_method(methodHandle method) { return true; }
68
69 // Determine if the current compiler provides an intrinsic
70 // for method 'method'. An intrinsic is available if:
71 // - the intrinsic is enabled (by using the appropriate command-line flag) and
72 // - the platform on which the VM is running supports the intrinsic
73 // (i.e., the platform provides the instructions necessary for the compiler
74 // to generate the intrinsic code).
75 //
76 // The second parameter, 'compilation_context', is needed to implement functionality
77 // related to the DisableIntrinsic command-line flag. The DisableIntrinsic flag can
78 // be used to prohibit the compilers to use an intrinsic. There are three ways to
79 // disable an intrinsic using the DisableIntrinsic flag:
80 //
81 // (1) -XX:DisableIntrinsic=_hashCode,_getClass
82 // Disables intrinsification of _hashCode and _getClass globally
83 // (i.e., the intrinsified version the methods will not be used at all).
84 // (2) -XX:CompileCommand=option,aClass::aMethod,ccstr,DisableIntrinsic,_hashCode
85 // Disables intrinsification of _hashCode if it is called from
86 // aClass::aMethod (but not for any other call site of _hashCode)
87 // (3) -XX:CompileCommand=option,java.lang.ref.Reference::get,ccstr,DisableIntrinsic,_Reference_get
88 // Some methods are not compiled by C2. Instead, the C2 compiler
89 // returns directly the intrinsified version of these methods.
90 // The command above forces C2 to compile _Reference_get, but
91 // allows using the intrinsified version of _Reference_get at all
92 // other call sites.
93 //
94 // From the modes above, (1) disable intrinsics globally, (2) and (3)
95 // disable intrinsics on a per-method basis. In cases (2) and (3) the
96 // compilation context is aClass::aMethod and java.lang.ref.Reference::get,
97 // respectively.
98 virtual bool is_intrinsic_available(methodHandle method, methodHandle compilation_context) {
99 return is_intrinsic_supported(method) &&
100 !vmIntrinsics::is_disabled_by_flags(method, compilation_context);
101 }
102
103 // Determines if an intrinsic is supported by the compiler, that is,
104 // the compiler provides the instructions necessary to generate
105 // the intrinsic code for method 'method'.
106 //
107 // The 'is_intrinsic_supported' method is a white list, that is,
108 // by default no intrinsics are supported by a compiler except
109 // the ones listed in the method. Overriding methods should conform
110 // to this behavior.
111 virtual bool is_intrinsic_supported(methodHandle method) {
112 return false;
113 }
114
115 // Compiler type queries.
116 bool is_c1() { return _type == c1; }
117 bool is_c2() { return _type == c2; }
118 bool is_shark() { return _type == shark; }
119
120 // Customization
121 virtual void initialize () = 0;
122
123 void set_num_compiler_threads(int num) { _num_compiler_threads = num; }
124 int num_compiler_threads() { return _num_compiler_threads; }
125
126 // Get/set state of compiler objects
127 bool is_initialized() { return _compiler_state == initialized; }
128 bool is_failed () { return _compiler_state == failed;}
129 void set_state (int state);
130 void set_shut_down () { set_state(shut_down); }
131 // Compilation entry point for methods
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