1 /*
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  3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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  6  * under the terms of the GNU General Public License version 2 only, as
  7  * published by the Free Software Foundation.
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  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  *
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 24 
 25 #ifndef SHARE_INTERPRETER_ABSTRACTINTERPRETER_HPP
 26 #define SHARE_INTERPRETER_ABSTRACTINTERPRETER_HPP
 27 
 28 #include "asm/macroAssembler.hpp"
 29 #include "classfile/vmIntrinsics.hpp"
 30 #include "code/stubs.hpp"
 31 #include "interpreter/bytecodes.hpp"
 32 #include "oops/method.hpp"
 33 #include "runtime/frame.hpp"
 34 #include "runtime/javaThread.hpp"
 35 #include "runtime/vmThread.hpp"
 36 
 37 // This file contains the platform-independent parts
 38 // of the abstract interpreter and the abstract interpreter generator.
 39 
 40 // Organization of the interpreter(s). There exists two different interpreters in hotpot
 41 // an assembly language version (aka template interpreter) and a high level language version
 42 // (aka c++ interpreter). Th division of labor is as follows:
 43 
 44 // Template Interpreter          Zero Interpreter       Functionality
 45 //
 46 // templateTable*                bytecodeInterpreter*   actual interpretation of bytecodes
 47 //
 48 // templateInterpreter*          zeroInterpreter*       generation of assembly code that creates
 49 //                                                      and manages interpreter runtime frames.
 50 //
 51 
 52 class InterpreterMacroAssembler;
 53 
 54 class AbstractInterpreter: AllStatic {
 55   friend class VMStructs;
 56   friend class ZeroInterpreterGenerator;
 57   friend class TemplateInterpreterGenerator;
 58  public:
 59   enum MethodKind {
 60     zerolocals,                                                 // method needs locals initialization
 61     zerolocals_synchronized,                                    // method needs locals initialization & is synchronized
 62     native,                                                     // native method
 63     native_synchronized,                                        // native method & is synchronized
 64     empty,                                                      // empty method (code: _return)
 65     getter,                                                     // getter method
 66     setter,                                                     // setter method
 67     abstract,                                                   // abstract method (throws an AbstractMethodException)
 68     method_handle_invoke_FIRST,                                 // java.lang.invoke.MethodHandles::invokeExact, etc.
 69     method_handle_invoke_LAST                                   = (method_handle_invoke_FIRST
 70                                                                    + (static_cast<int>(vmIntrinsics::LAST_MH_SIG_POLY)
 71                                                                       - static_cast<int>(vmIntrinsics::FIRST_MH_SIG_POLY))),
 72     java_lang_math_sin,                                         // implementation of java.lang.Math.sin   (x)
 73     java_lang_math_cos,                                         // implementation of java.lang.Math.cos   (x)
 74     java_lang_math_tan,                                         // implementation of java.lang.Math.tan   (x)
 75     java_lang_math_abs,                                         // implementation of java.lang.Math.abs   (x)
 76     java_lang_math_sqrt,                                        // implementation of java.lang.Math.sqrt  (x)
 77     java_lang_math_sqrt_strict,                                 // implementation of java.lang.StrictMath.sqrt(x)
 78     java_lang_math_log,                                         // implementation of java.lang.Math.log   (x)
 79     java_lang_math_log10,                                       // implementation of java.lang.Math.log10 (x)
 80     java_lang_math_pow,                                         // implementation of java.lang.Math.pow   (x,y)
 81     java_lang_math_exp,                                         // implementation of java.lang.Math.exp   (x)
 82     java_lang_math_fmaF,                                        // implementation of java.lang.Math.fma   (x, y, z)
 83     java_lang_math_fmaD,                                        // implementation of java.lang.Math.fma   (x, y, z)
 84     java_lang_ref_reference_get,                                // implementation of java.lang.ref.Reference.get()
 85     java_util_zip_CRC32_update,                                 // implementation of java.util.zip.CRC32.update()
 86     java_util_zip_CRC32_updateBytes,                            // implementation of java.util.zip.CRC32.updateBytes()
 87     java_util_zip_CRC32_updateByteBuffer,                       // implementation of java.util.zip.CRC32.updateByteBuffer()
 88     java_util_zip_CRC32C_updateBytes,                           // implementation of java.util.zip.CRC32C.updateBytes(crc, b[], off, end)
 89     java_util_zip_CRC32C_updateDirectByteBuffer,                // implementation of java.util.zip.CRC32C.updateDirectByteBuffer(crc, address, off, end)
 90     java_lang_Float_intBitsToFloat,                             // implementation of java.lang.Float.intBitsToFloat()
 91     java_lang_Float_floatToRawIntBits,                          // implementation of java.lang.Float.floatToRawIntBits()
 92     java_lang_Float_float16ToFloat,                             // implementation of java.lang.Float.float16ToFloat()
 93     java_lang_Float_floatToFloat16,                             // implementation of java.lang.Float.floatToFloat16()
 94     java_lang_Double_longBitsToDouble,                          // implementation of java.lang.Double.longBitsToDouble()
 95     java_lang_Double_doubleToRawLongBits,                       // implementation of java.lang.Double.doubleToRawLongBits()
 96     java_lang_Thread_currentThread,                             // implementation of java.lang.Thread.currentThread()
 97     number_of_method_entries,
 98     invalid = -1
 99   };
100 
101   // Conversion from the part of the above enum to vmIntrinsics::_invokeExact, etc.
102   static vmIntrinsics::ID method_handle_intrinsic(MethodKind kind) {
103     if (kind >= method_handle_invoke_FIRST && kind <= method_handle_invoke_LAST)
104       return vmIntrinsics::ID_from(static_cast<int>(vmIntrinsics::FIRST_MH_SIG_POLY) + (kind - method_handle_invoke_FIRST));
105     else
106       return vmIntrinsics::_none;
107   }
108 
109   // Conversion from the above enum to vmIntrinsics::ID
110   static vmIntrinsics::ID method_intrinsic(MethodKind kind);
111 
112   enum SomeConstants {
113     number_of_result_handlers = 11                              // number of result handlers for native calls
114   };
115 
116  protected:
117   static StubQueue* _code;                                      // the interpreter code (codelets)
118 
119   static bool       _notice_safepoints;                         // true if safepoints are activated
120 
121   // method entry points
122   static address    _entry_table[number_of_method_entries];     // entry points for a given method
123   static address    _native_abi_to_tosca[number_of_result_handlers];  // for native method result handlers
124   static address    _slow_signature_handler;                              // the native method generic (slow) signature handler
125 
126   static address    _rethrow_exception_entry;                   // rethrows an activation in previous frame
127 
128   friend class      AbstractInterpreterGenerator;
129   friend class      InterpreterMacroAssembler;
130 
131  public:
132   // Initialization/debugging
133   static void       initialize();
134   static StubQueue* code()                                      { return _code; }
135 
136 
137   // Method activation
138   static MethodKind method_kind(const methodHandle& m);
139   static address    entry_for_kind(MethodKind k)                { assert(0 <= k && k < number_of_method_entries, "illegal kind"); return _entry_table[k]; }
140   static address    entry_for_method(const methodHandle& m)     { return entry_for_kind(method_kind(m)); }
141 
142   // used for bootstrapping method handles:
143   static void       set_entry_for_kind(MethodKind k, address e);
144 
145   static void       print_method_kind(MethodKind kind)          PRODUCT_RETURN;
146 
147   // These should never be compiled since the interpreter will prefer
148   // the compiled version to the intrinsic version.
149   static bool       can_be_compiled(const methodHandle& m) {
150     switch (m->intrinsic_id()) {
151       case vmIntrinsics::_dsin  : // fall thru
152       case vmIntrinsics::_dcos  : // fall thru
153       case vmIntrinsics::_dtan  : // fall thru
154       case vmIntrinsics::_dabs  : // fall thru
155       case vmIntrinsics::_dsqrt : // fall thru
156       case vmIntrinsics::_dsqrt_strict : // fall thru
157       case vmIntrinsics::_dlog  : // fall thru
158       case vmIntrinsics::_dlog10: // fall thru
159       case vmIntrinsics::_dpow  : // fall thru
160       case vmIntrinsics::_dexp  : // fall thru
161       case vmIntrinsics::_fmaD  : // fall thru
162       case vmIntrinsics::_fmaF  : // fall thru
163       case vmIntrinsics::_floatToFloat16       : // fall thru
164       case vmIntrinsics::_float16ToFloat       : // fall thru
165       case vmIntrinsics::_Continuation_doYield : // fall thru
166         return false;
167 
168       default:
169         return true;
170     }
171   }
172 
173   // Runtime support
174 
175   // length = invoke bytecode length (to advance to next bytecode)
176   static address deopt_entry(TosState state, int length) { ShouldNotReachHere(); return nullptr; }
177   static address return_entry(TosState state, int length, Bytecodes::Code code) { ShouldNotReachHere(); return nullptr; }
178 
179   static address    rethrow_exception_entry()                   { return _rethrow_exception_entry; }
180 
181   // Activation size in words for a method that is just being called.
182   // Parameters haven't been pushed so count them too.
183   static int        size_top_interpreter_activation(Method* method);
184 
185   // Deoptimization support
186   // Compute the entry address for continuation after
187   static address deopt_continue_after_entry(Method* method,
188                                             address bcp,
189                                             int callee_parameters,
190                                             bool is_top_frame);
191   // Compute the entry address for reexecution
192   static address deopt_reexecute_entry(Method* method, address bcp);
193   // Deoptimization should reexecute this bytecode
194   static bool    bytecode_should_reexecute(Bytecodes::Code code);
195 
196   // deoptimization support
197   static int        size_activation(int max_stack,
198                                     int temps,
199                                     int extra_args,
200                                     int monitors,
201                                     int callee_params,
202                                     int callee_locals,
203                                     bool is_top_frame);
204 
205   static void      layout_activation(Method* method,
206                                      int temps,
207                                      int popframe_args,
208                                      int monitors,
209                                      int caller_actual_parameters,
210                                      int callee_params,
211                                      int callee_locals,
212                                      frame* caller,
213                                      frame* interpreter_frame,
214                                      bool is_top_frame,
215                                      bool is_bottom_frame);
216 
217   // Runtime support
218   static bool       is_not_reached(const methodHandle& method, int bci);
219   // Safepoint support
220   static void       notice_safepoints()                         { ShouldNotReachHere(); } // stops the thread when reaching a safepoint
221   static void       ignore_safepoints()                         { ShouldNotReachHere(); } // ignores safepoints
222 
223   // Support for native calls
224   static address    slow_signature_handler()                    { return _slow_signature_handler; }
225   static address    result_handler(BasicType type)              { return _native_abi_to_tosca[BasicType_as_index(type)]; }
226   static int        BasicType_as_index(BasicType type);         // computes index into result_handler_by_index table
227   // Debugging/printing
228   static void       print();                                    // prints the interpreter code
229 
230  public:
231   // Interpreter helpers
232   const static int stackElementWords   = 1;
233   const static int stackElementSize    = stackElementWords * wordSize;
234   const static int logStackElementSize = LogBytesPerWord;
235 
236   static int expr_index_at(int i) {
237     return stackElementWords * i;
238   }
239 
240   static int expr_offset_in_bytes(int i) {
241 #if !defined(ZERO) && (defined(PPC) || defined(S390))
242     return stackElementSize * i + wordSize;  // both point to one word past TOS
243 #else
244     return stackElementSize * i;
245 #endif
246   }
247 
248   static int local_index_at(int i) {
249     assert(i <= 0, "local direction already negated");
250     return stackElementWords * i;
251   }
252 
253 #if !defined(ZERO) && (defined(IA32) || defined(AMD64))
254   static Address::ScaleFactor stackElementScale() {
255     return NOT_LP64(Address::times_4) LP64_ONLY(Address::times_8);
256   }
257 #endif
258 
259   // Local values relative to locals[n]
260   static int  local_offset_in_bytes(int n) {
261     return ((frame::interpreter_frame_expression_stack_direction() * n) * stackElementSize);
262   }
263 
264   // access to stacked values according to type:
265   static oop* oop_addr_in_slot(intptr_t* slot_addr) {
266     return (oop*) slot_addr;
267   }
268   static jint* int_addr_in_slot(intptr_t* slot_addr) {
269     if ((int) sizeof(jint) < wordSize && !Endian::is_Java_byte_ordering_different())
270       // big-endian LP64
271       return (jint*)(slot_addr + 1) - 1;
272     else
273       return (jint*) slot_addr;
274   }
275   static jlong long_in_slot(intptr_t* slot_addr) {
276     if (sizeof(intptr_t) >= sizeof(jlong)) {
277       return *(jlong*) slot_addr;
278     } else {
279       return Bytes::get_native_u8((address)slot_addr);
280     }
281   }
282   static void set_long_in_slot(intptr_t* slot_addr, jlong value) {
283     if (sizeof(intptr_t) >= sizeof(jlong)) {
284       *(jlong*) slot_addr = value;
285     } else {
286       Bytes::put_native_u8((address)slot_addr, value);
287     }
288   }
289 
290   static void initialize_method_handle_entries();
291 };
292 
293 //------------------------------------------------------------------------------------------------------------------------
294 // The interpreter generator.
295 
296 class Template;
297 class AbstractInterpreterGenerator: public StackObj {
298  protected:
299   InterpreterMacroAssembler* _masm;
300 
301  public:
302   AbstractInterpreterGenerator();
303 };
304 
305 #endif // SHARE_INTERPRETER_ABSTRACTINTERPRETER_HPP