1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
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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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23 */
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). The 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_tanh, // implementation of java.lang.Math.tanh (x)
76 java_lang_math_cbrt, // implementation of java.lang.Math.cbrt (x)
77 java_lang_math_abs, // implementation of java.lang.Math.abs (x)
78 java_lang_math_sqrt, // implementation of java.lang.Math.sqrt (x)
79 java_lang_math_sqrt_strict, // implementation of java.lang.StrictMath.sqrt(x)
80 java_lang_math_log, // implementation of java.lang.Math.log (x)
81 java_lang_math_log10, // implementation of java.lang.Math.log10 (x)
82 java_lang_math_pow, // implementation of java.lang.Math.pow (x,y)
83 java_lang_math_exp, // implementation of java.lang.Math.exp (x)
84 java_lang_math_fmaF, // implementation of java.lang.Math.fma (x, y, z)
85 java_lang_math_fmaD, // implementation of java.lang.Math.fma (x, y, z)
86 java_lang_ref_reference_get, // implementation of java.lang.ref.Reference.get()
87 java_util_zip_CRC32_update, // implementation of java.util.zip.CRC32.update()
88 java_util_zip_CRC32_updateBytes, // implementation of java.util.zip.CRC32.updateBytes()
89 java_util_zip_CRC32_updateByteBuffer, // implementation of java.util.zip.CRC32.updateByteBuffer()
90 java_util_zip_CRC32C_updateBytes, // implementation of java.util.zip.CRC32C.updateBytes(crc, b[], off, end)
91 java_util_zip_CRC32C_updateDirectByteBuffer, // implementation of java.util.zip.CRC32C.updateDirectByteBuffer(crc, address, off, end)
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_Thread_currentThread, // implementation of java.lang.Thread.currentThread()
95 number_of_method_entries,
96 invalid = -1
97 };
98
99 // Conversion from the part of the above enum to vmIntrinsics::_invokeExact, etc.
100 static vmIntrinsics::ID method_handle_intrinsic(MethodKind kind) {
101 if (kind >= method_handle_invoke_FIRST && kind <= method_handle_invoke_LAST)
102 return vmIntrinsics::ID_from(static_cast<int>(vmIntrinsics::FIRST_MH_SIG_POLY) + (kind - method_handle_invoke_FIRST));
103 else
104 return vmIntrinsics::_none;
105 }
106
107 // Conversion from the above enum to vmIntrinsics::ID
108 static vmIntrinsics::ID method_intrinsic(MethodKind kind);
109
110 enum SomeConstants {
111 number_of_result_handlers = 10 // number of result handlers for native calls
112 };
113
114 protected:
115 static StubQueue* _code; // the interpreter code (codelets)
116
117 static bool _notice_safepoints; // true if safepoints are activated
118
119 // method entry points
120 static address _entry_table[number_of_method_entries]; // entry points for a given method
121 static address _native_abi_to_tosca[number_of_result_handlers]; // for native method result handlers
122 static address _slow_signature_handler; // the native method generic (slow) signature handler
123
124 static address _rethrow_exception_entry; // rethrows an activation in previous frame
125
126 static bool _should_print_instructions; // only with PrintInterpreter and when printing all InterpreterCodelet
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 static bool should_print_instructions() { return _should_print_instructions; }
136
137
138 // Method activation
139 static MethodKind method_kind(const methodHandle& m);
140 static address entry_for_kind(MethodKind k) { assert(0 <= k && k < number_of_method_entries, "illegal kind"); return _entry_table[k]; }
141 static address entry_for_method(const methodHandle& m) { return entry_for_kind(method_kind(m)); }
142
143 // used for bootstrapping method handles:
144 static void set_entry_for_kind(MethodKind k, address e);
145
146 static void print_method_kind(MethodKind kind) PRODUCT_RETURN;
147
148 // These should never be compiled since the interpreter will prefer
149 // the compiled version to the intrinsic version.
150 static bool can_be_compiled(const methodHandle& m) {
151 switch (m->intrinsic_id()) {
152 case vmIntrinsics::_dsin : // fall thru
153 case vmIntrinsics::_dcos : // fall thru
154 case vmIntrinsics::_dtan : // fall thru
155 case vmIntrinsics::_dtanh : // fall thru
156 case vmIntrinsics::_dcbrt : // fall thru
157 case vmIntrinsics::_dabs : // fall thru
158 case vmIntrinsics::_dsqrt : // fall thru
159 case vmIntrinsics::_dsqrt_strict : // fall thru
160 case vmIntrinsics::_dlog : // fall thru
161 case vmIntrinsics::_dlog10: // fall thru
162 case vmIntrinsics::_dpow : // fall thru
163 case vmIntrinsics::_dexp : // fall thru
164 case vmIntrinsics::_fmaD : // fall thru
165 case vmIntrinsics::_fmaF : // fall thru
166 case vmIntrinsics::_floatToFloat16 : // fall thru
167 case vmIntrinsics::_float16ToFloat : // fall thru
168 case vmIntrinsics::_Continuation_doYield : // fall thru
169 return false;
170
171 default:
172 return true;
173 }
174 }
175
176 // Runtime support
177
178 // length = invoke bytecode length (to advance to next bytecode)
179 static address deopt_entry(TosState state, int length) { ShouldNotReachHere(); return nullptr; }
180 static address return_entry(TosState state, int length, Bytecodes::Code code) { ShouldNotReachHere(); return nullptr; }
181
182 static address rethrow_exception_entry() { return _rethrow_exception_entry; }
183
184 // Activation size in words for a method that is just being called.
185 // Parameters haven't been pushed so count them too.
186 static int size_top_interpreter_activation(Method* method);
187
188 // Deoptimization support
189 // Compute the entry address for continuation after
190 static address deopt_continue_after_entry(Method* method,
191 address bcp,
192 int callee_parameters,
193 bool is_top_frame);
194 // Compute the entry address for reexecution
195 static address deopt_reexecute_entry(Method* method, address bcp);
196 // Deoptimization should reexecute this bytecode
197 static bool bytecode_should_reexecute(Bytecodes::Code code);
198
199 // deoptimization support
200 static int size_activation(int max_stack,
201 int temps,
202 int extra_args,
203 int monitors,
204 int callee_params,
205 int callee_locals,
206 bool is_top_frame);
207
208 static void layout_activation(Method* method,
209 int temps,
210 int popframe_args,
211 int monitors,
212 int caller_actual_parameters,
213 int callee_params,
214 int callee_locals,
215 frame* caller,
216 frame* interpreter_frame,
217 bool is_top_frame,
218 bool is_bottom_frame);
219
220 // Runtime support
221 static bool is_not_reached(const methodHandle& method, int bci);
222 // Safepoint support
223 static void notice_safepoints() { ShouldNotReachHere(); } // stops the thread when reaching a safepoint
224 static void ignore_safepoints() { ShouldNotReachHere(); } // ignores safepoints
225
226 // Support for native calls
227 static address slow_signature_handler() { return _slow_signature_handler; }
228 static address result_handler(BasicType type) { return _native_abi_to_tosca[BasicType_as_index(type)]; }
229 static int BasicType_as_index(BasicType type); // computes index into result_handler_by_index table
230 // Debugging/printing
231 static void print(); // prints the interpreter code
232
233 public:
234 // Interpreter helpers
235 const static int stackElementWords = 1;
236 const static int stackElementSize = stackElementWords * wordSize;
237 const static int logStackElementSize = LogBytesPerWord;
238
239 static int expr_index_at(int i) {
240 return stackElementWords * i;
241 }
242
243 static int expr_offset_in_bytes(int i) {
244 #if !defined(ZERO) && (defined(PPC) || defined(S390))
245 return stackElementSize * i + wordSize; // both point to one word past TOS
246 #else
247 return stackElementSize * i;
248 #endif
249 }
250
251 static int local_index_at(int i) {
252 assert(i <= 0, "local direction already negated");
253 return stackElementWords * i;
254 }
255
256 #if !defined(ZERO) && (defined(IA32) || defined(AMD64))
257 static Address::ScaleFactor stackElementScale() {
258 return NOT_LP64(Address::times_4) LP64_ONLY(Address::times_8);
259 }
260 #endif
261
262 // Local values relative to locals[n]
263 static int local_offset_in_bytes(int n) {
264 return ((frame::interpreter_frame_expression_stack_direction() * n) * stackElementSize);
265 }
266
267 // access to stacked values according to type:
268 static oop* oop_addr_in_slot(intptr_t* slot_addr) {
269 return (oop*) slot_addr;
270 }
271 static jint* int_addr_in_slot(intptr_t* slot_addr) {
272 if ((int) sizeof(jint) < wordSize && !Endian::is_Java_byte_ordering_different())
273 // big-endian LP64
274 return (jint*)(slot_addr + 1) - 1;
275 else
276 return (jint*) slot_addr;
277 }
278 static jlong long_in_slot(intptr_t* slot_addr) {
279 if (sizeof(intptr_t) >= sizeof(jlong)) {
280 return *(jlong*) slot_addr;
281 } else {
282 return Bytes::get_native_u8((address)slot_addr);
283 }
284 }
285 static void set_long_in_slot(intptr_t* slot_addr, jlong value) {
286 if (sizeof(intptr_t) >= sizeof(jlong)) {
287 *(jlong*) slot_addr = value;
288 } else {
289 Bytes::put_native_u8((address)slot_addr, value);
290 }
291 }
292
293 static void initialize_method_handle_entries();
294 };
295
296 //------------------------------------------------------------------------------------------------------------------------
297 // The interpreter generator.
298
299 class Template;
300 class AbstractInterpreterGenerator: public StackObj {
301 protected:
302 InterpreterMacroAssembler* _masm;
303
304 public:
305 AbstractInterpreterGenerator();
306 };
307
308 #endif // SHARE_INTERPRETER_ABSTRACTINTERPRETER_HPP