9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP
26 #define SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP
27
28 #include "ci/compilerInterface.hpp"
29
30 class AbstractCompiler : public CHeapObj<mtCompiler> {
31 private:
32 volatile int _num_compiler_threads;
33
34 protected:
35 volatile int _compiler_state;
36 // Used for tracking global state of compiler runtime initialization
37 enum { uninitialized, initializing, initialized, failed, shut_down };
38
39 // This method returns true for the first compiler thread that reaches that methods.
40 // This thread will initialize the compiler runtime.
41 bool should_perform_init();
42
43 // The (closed set) of concrete compiler classes.
44 enum Type {
45 none,
46 c1,
47 c2,
48 shark
51 private:
52 Type _type;
53
54 public:
55 AbstractCompiler(Type type) : _type(type), _compiler_state(uninitialized), _num_compiler_threads(0) {}
56
57 // This function determines the compiler thread that will perform the
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
132 virtual void compile_method(ciEnv* env, ciMethod* target, int entry_bci) {
133 ShouldNotReachHere();
134 }
135
136
137 // Print compilation timers and statistics
138 virtual void print_timers() {
139 ShouldNotReachHere();
140 }
141 };
142
143 #endif // SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP
|
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP
26 #define SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP
27
28 #include "ci/compilerInterface.hpp"
29 #include "compiler/compilerDirectives.hpp"
30
31 class AbstractCompiler : public CHeapObj<mtCompiler> {
32 private:
33 volatile int _num_compiler_threads;
34
35 protected:
36 volatile int _compiler_state;
37 // Used for tracking global state of compiler runtime initialization
38 enum { uninitialized, initializing, initialized, failed, shut_down };
39
40 // This method returns true for the first compiler thread that reaches that methods.
41 // This thread will initialize the compiler runtime.
42 bool should_perform_init();
43
44 // The (closed set) of concrete compiler classes.
45 enum Type {
46 none,
47 c1,
48 c2,
49 shark
52 private:
53 Type _type;
54
55 public:
56 AbstractCompiler(Type type) : _type(type), _compiler_state(uninitialized), _num_compiler_threads(0) {}
57
58 // This function determines the compiler thread that will perform the
59 // shutdown of the corresponding compiler runtime.
60 bool should_perform_shutdown();
61
62 // Name of this compiler
63 virtual const char* name() = 0;
64
65 // Missing feature tests
66 virtual bool supports_native() { return true; }
67 virtual bool supports_osr () { return true; }
68 virtual bool can_compile_method(methodHandle method) { return true; }
69
70 // Determine if the current compiler provides an intrinsic
71 // for method 'method'. An intrinsic is available if:
72 // - the intrinsic is enabled (by using the appropriate command-line flag
73 // , the command-line compile ommand, or a compiler directive)
74 // - the platform on which the VM is running supports the intrinsic
75 // (i.e., the platform provides the instructions necessary for the compiler
76 // to generate the intrinsic code).
77 //
78 // The directive provides the compilation context and includes pre-evaluated values
79 // dependent on VM flags, compile commands, and compiler directives.
80 //
81 // Usually, the compilation context is the caller of the method 'method'.
82 // The only case when for a non-recursive method 'method' the compilation context
83 // is not the caller of the 'method' (but it is the method itself) is
84 // java.lang.ref.Referene::get.
85 // For java.lang.ref.Reference::get, the intrinsic version is used
86 // instead of the compiled version so that the value in the referent
87 // field can be registered by the G1 pre-barrier code. The intrinsified
88 // version of Reference::get also adds a memory barrier to prevent
89 // commoning reads from the referent field across safepoint since GC
90 // can change the referent field's value. See Compile::Compile()
91 // in src/share/vm/opto/compile.cpp or
92 // GraphBuilder::GraphBuilder() in src/share/vm/c1/c1_GraphBuilder.cpp
93 // for more details.
94
95 virtual bool is_intrinsic_available(methodHandle method, DirectiveSet* directive) {
96 return is_intrinsic_supported(method) &&
97 !directive->is_intrinsic_disabled(method) &&
98 !vmIntrinsics::is_disabled_by_flags(method);
99 }
100
101 // Determines if an intrinsic is supported by the compiler, that is,
102 // the compiler provides the instructions necessary to generate
103 // the intrinsic code for method 'method'.
104 //
105 // The 'is_intrinsic_supported' method is a white list, that is,
106 // by default no intrinsics are supported by a compiler except
107 // the ones listed in the method. Overriding methods should conform
108 // to this behavior.
109 virtual bool is_intrinsic_supported(methodHandle method) {
110 return false;
111 }
112
113 // Compiler type queries.
114 bool is_c1() { return _type == c1; }
115 bool is_c2() { return _type == c2; }
116 bool is_shark() { return _type == shark; }
117
118 // Customization
119 virtual void initialize () = 0;
120
121 void set_num_compiler_threads(int num) { _num_compiler_threads = num; }
122 int num_compiler_threads() { return _num_compiler_threads; }
123
124 // Get/set state of compiler objects
125 bool is_initialized() { return _compiler_state == initialized; }
126 bool is_failed () { return _compiler_state == failed;}
127 void set_state (int state);
128 void set_shut_down () { set_state(shut_down); }
129 // Compilation entry point for methods
130 virtual void compile_method(ciEnv* env, ciMethod* target, int entry_bci, DirectiveSet* directive) {
131 ShouldNotReachHere();
132 }
133
134
135 // Print compilation timers and statistics
136 virtual void print_timers() {
137 ShouldNotReachHere();
138 }
139 };
140
141 #endif // SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP
|