1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
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.
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23 */
24
25 #ifndef SHARE_VM_INTERPRETER_ABSTRACTINTERPRETER_HPP
26 #define SHARE_VM_INTERPRETER_ABSTRACTINTERPRETER_HPP
27
28 #include "asm/macroAssembler.hpp"
29 #include "code/stubs.hpp"
30 #include "interpreter/bytecodes.hpp"
31 #include "runtime/frame.hpp"
32 #include "runtime/thread.hpp"
33 #include "runtime/vmThread.hpp"
34
35 // This file contains the platform-independent parts
36 // of the abstract interpreter and the abstract interpreter generator.
37
38 // Organization of the interpreter(s). There exists two different interpreters in hotpot
39 // an assembly language version (aka template interpreter) and a high level language version
40 // (aka c++ interpreter). Th division of labor is as follows:
41
42 // Template Interpreter C++ Interpreter Functionality
43 //
44 // templateTable* bytecodeInterpreter* actual interpretation of bytecodes
45 //
46 // templateInterpreter* cppInterpreter* generation of assembly code that creates
47 // and manages interpreter runtime frames.
48 // Also code for populating interpreter
49 // frames created during deoptimization.
50 //
51
52 class InterpreterMacroAssembler;
53
54 class AbstractInterpreter: AllStatic {
55 friend class VMStructs;
56 friend class CppInterpreterGenerator;
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 accessor, // accessor method (code: _aload_0, _getfield, _(a|i)return)
66 abstract, // abstract method (throws an AbstractMethodException)
67 method_handle_invoke_FIRST, // java.lang.invoke.MethodHandles::invokeExact, etc.
68 method_handle_invoke_LAST = (method_handle_invoke_FIRST
69 + (vmIntrinsics::LAST_MH_SIG_POLY
70 - vmIntrinsics::FIRST_MH_SIG_POLY)),
71 java_lang_math_sin, // implementation of java.lang.Math.sin (x)
72 java_lang_math_cos, // implementation of java.lang.Math.cos (x)
73 java_lang_math_tan, // implementation of java.lang.Math.tan (x)
74 java_lang_math_abs, // implementation of java.lang.Math.abs (x)
75 java_lang_math_sqrt, // implementation of java.lang.Math.sqrt (x)
76 java_lang_math_log, // implementation of java.lang.Math.log (x)
77 java_lang_math_log10, // implementation of java.lang.Math.log10 (x)
78 java_lang_math_pow, // implementation of java.lang.Math.pow (x,y)
79 java_lang_math_exp, // implementation of java.lang.Math.exp (x)
80 java_lang_math_fmaF, // implementation of java.lang.Math.fma (x, y, z)
81 java_lang_math_fmaD, // implementation of java.lang.Math.fma (x, y, z)
82 java_lang_ref_reference_get, // implementation of java.lang.ref.Reference.get()
83 java_util_zip_CRC32_update, // implementation of java.util.zip.CRC32.update()
84 java_util_zip_CRC32_updateBytes, // implementation of java.util.zip.CRC32.updateBytes()
85 java_util_zip_CRC32_updateByteBuffer, // implementation of java.util.zip.CRC32.updateByteBuffer()
86 java_util_zip_CRC32C_updateBytes, // implementation of java.util.zip.CRC32C.updateBytes(crc, b[], off, end)
87 java_util_zip_CRC32C_updateDirectByteBuffer, // implementation of java.util.zip.CRC32C.updateDirectByteBuffer(crc, address, off, end)
88 java_lang_Float_intBitsToFloat, // implementation of java.lang.Float.intBitsToFloat()
89 java_lang_Float_floatToRawIntBits, // implementation of java.lang.Float.floatToRawIntBits()
90 java_lang_Double_longBitsToDouble, // implementation of java.lang.Double.longBitsToDouble()
91 java_lang_Double_doubleToRawLongBits, // implementation of java.lang.Double.doubleToRawLongBits()
92 java_lang_System_setBit,
93 java_lang_System_clrBit,
94 number_of_method_entries,
95 invalid = -1
96 };
97
98 // Conversion from the part of the above enum to vmIntrinsics::_invokeExact, etc.
99 static vmIntrinsics::ID method_handle_intrinsic(MethodKind kind) {
100 if (kind >= method_handle_invoke_FIRST && kind <= method_handle_invoke_LAST)
101 return (vmIntrinsics::ID)( vmIntrinsics::FIRST_MH_SIG_POLY + (kind - method_handle_invoke_FIRST) );
102 else
103 return vmIntrinsics::_none;
104 }
105
106 enum SomeConstants {
107 number_of_result_handlers = 10 // number of result handlers for native calls
108 };
109
110 protected:
111 static StubQueue* _code; // the interpreter code (codelets)
112
113 static bool _notice_safepoints; // true if safepoints are activated
114
115 static address _native_entry_begin; // Region for native entry code
116 static address _native_entry_end;
117
118 // method entry points
119 static address _entry_table[number_of_method_entries]; // entry points for a given method
120 static address _cds_entry_table[number_of_method_entries]; // entry points for methods in the CDS archive
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 friend class AbstractInterpreterGenerator;
127 friend class InterpreterMacroAssembler;
128
129 public:
130 // Initialization/debugging
131 static void initialize();
132 static StubQueue* code() { return _code; }
133
134
135 // Method activation
136 static MethodKind method_kind(const methodHandle& m);
137 static address entry_for_kind(MethodKind k) { assert(0 <= k && k < number_of_method_entries, "illegal kind"); return _entry_table[k]; }
138 static address entry_for_method(const methodHandle& m) { return entry_for_kind(method_kind(m)); }
139
140 static address entry_for_cds_method(const methodHandle& m) {
141 MethodKind k = method_kind(m);
142 assert(0 <= k && k < number_of_method_entries, "illegal kind");
143 return _cds_entry_table[k];
144 }
145
146 // used by class data sharing
147 static void update_cds_entry_table(MethodKind kind) NOT_CDS_RETURN;
148
149 static address get_trampoline_code_buffer(AbstractInterpreter::MethodKind kind) NOT_CDS_RETURN_(0);
150
151 // used for bootstrapping method handles:
152 static void set_entry_for_kind(MethodKind k, address e);
153
154 static void print_method_kind(MethodKind kind) PRODUCT_RETURN;
155
156 // These should never be compiled since the interpreter will prefer
157 // the compiled version to the intrinsic version.
158 static bool can_be_compiled(const methodHandle& m) {
159 switch (m->intrinsic_id()) {
160 case vmIntrinsics::_setBit: // fall thru
161 case vmIntrinsics::_clrBit: // fall thru
162 case vmIntrinsics::_dsin : // fall thru
163 case vmIntrinsics::_dcos : // fall thru
164 case vmIntrinsics::_dtan : // fall thru
165 case vmIntrinsics::_dabs : // fall thru
166 case vmIntrinsics::_dsqrt : // fall thru
167 case vmIntrinsics::_dlog : // fall thru
168 case vmIntrinsics::_dlog10: // fall thru
169 case vmIntrinsics::_dpow : // fall thru
170 case vmIntrinsics::_dexp : // fall thru
171 case vmIntrinsics::_fmaD : // fall thru
172 case vmIntrinsics::_fmaF : // fall thru
173 return false;
174 default:
175 return true;
176 }
177 }
178
179 // Runtime support
180
181 // length = invoke bytecode length (to advance to next bytecode)
182 static address deopt_entry(TosState state, int length) { ShouldNotReachHere(); return NULL; }
183 static address return_entry(TosState state, int length, Bytecodes::Code code) { ShouldNotReachHere(); return NULL; }
184
185 static address rethrow_exception_entry() { return _rethrow_exception_entry; }
186
187 // Activation size in words for a method that is just being called.
188 // Parameters haven't been pushed so count them too.
189 static int size_top_interpreter_activation(Method* method);
190
191 // Deoptimization support
192 // Compute the entry address for continuation after
193 static address deopt_continue_after_entry(Method* method,
194 address bcp,
195 int callee_parameters,
196 bool is_top_frame);
197 // Compute the entry address for reexecution
198 static address deopt_reexecute_entry(Method* method, address bcp);
199 // Deoptimization should reexecute this bytecode
200 static bool bytecode_should_reexecute(Bytecodes::Code code);
201
202 // deoptimization support
203 static int size_activation(int max_stack,
204 int temps,
205 int extra_args,
206 int monitors,
207 int callee_params,
208 int callee_locals,
209 bool is_top_frame);
210
211 static void layout_activation(Method* method,
212 int temps,
213 int popframe_args,
214 int monitors,
215 int caller_actual_parameters,
216 int callee_params,
217 int callee_locals,
218 frame* caller,
219 frame* interpreter_frame,
220 bool is_top_frame,
221 bool is_bottom_frame);
222
223 // Runtime support
224 static bool is_not_reached(const methodHandle& method, int bci);
225 // Safepoint support
226 static void notice_safepoints() { ShouldNotReachHere(); } // stops the thread when reaching a safepoint
227 static void ignore_safepoints() { ShouldNotReachHere(); } // ignores safepoints
228
229 // Support for native calls
230 static address slow_signature_handler() { return _slow_signature_handler; }
231 static address result_handler(BasicType type) { return _native_abi_to_tosca[BasicType_as_index(type)]; }
232 static int BasicType_as_index(BasicType type); // computes index into result_handler_by_index table
233 static bool in_native_entry(address pc) { return _native_entry_begin <= pc && pc < _native_entry_end; }
234 // Debugging/printing
235 static void print(); // prints the interpreter code
236
237 public:
238 // Interpreter helpers
239 const static int stackElementWords = 1;
240 const static int stackElementSize = stackElementWords * wordSize;
241 const static int logStackElementSize = LogBytesPerWord;
242
243 static int expr_index_at(int i) {
244 return stackElementWords * i;
245 }
246
247 static int expr_offset_in_bytes(int i) {
248 #if !defined(ZERO) && (defined(PPC) || defined(S390) || defined(SPARC))
249 return stackElementSize * i + wordSize; // both point to one word past TOS
250 #else
251 return stackElementSize * i;
252 #endif
253 }
254
255 static int local_index_at(int i) {
256 assert(i <= 0, "local direction already negated");
257 return stackElementWords * i;
258 }
259
260 #if !defined(ZERO) && (defined(IA32) || defined(AMD64))
261 static Address::ScaleFactor stackElementScale() {
262 return NOT_LP64(Address::times_4) LP64_ONLY(Address::times_8);
263 }
264 #endif
265
266 // Local values relative to locals[n]
267 static int local_offset_in_bytes(int n) {
268 return ((frame::interpreter_frame_expression_stack_direction() * n) * stackElementSize);
269 }
270
271 // access to stacked values according to type:
272 static oop* oop_addr_in_slot(intptr_t* slot_addr) {
273 return (oop*) slot_addr;
274 }
275 static jint* int_addr_in_slot(intptr_t* slot_addr) {
276 if ((int) sizeof(jint) < wordSize && !Endian::is_Java_byte_ordering_different())
277 // big-endian LP64
278 return (jint*)(slot_addr + 1) - 1;
279 else
280 return (jint*) slot_addr;
281 }
282 static jlong long_in_slot(intptr_t* slot_addr) {
283 if (sizeof(intptr_t) >= sizeof(jlong)) {
284 return *(jlong*) slot_addr;
285 } else {
286 return Bytes::get_native_u8((address)slot_addr);
287 }
288 }
289 static void set_long_in_slot(intptr_t* slot_addr, jlong value) {
290 if (sizeof(intptr_t) >= sizeof(jlong)) {
291 *(jlong*) slot_addr = value;
292 } else {
293 Bytes::put_native_u8((address)slot_addr, value);
294 }
295 }
296 static void get_jvalue_in_slot(intptr_t* slot_addr, BasicType type, jvalue* value) {
297 switch (type) {
298 case T_BOOLEAN: value->z = *int_addr_in_slot(slot_addr); break;
299 case T_CHAR: value->c = *int_addr_in_slot(slot_addr); break;
300 case T_BYTE: value->b = *int_addr_in_slot(slot_addr); break;
301 case T_SHORT: value->s = *int_addr_in_slot(slot_addr); break;
302 case T_INT: value->i = *int_addr_in_slot(slot_addr); break;
303 case T_LONG: value->j = long_in_slot(slot_addr); break;
304 case T_FLOAT: value->f = *(jfloat*)int_addr_in_slot(slot_addr); break;
305 case T_DOUBLE: value->d = jdouble_cast(long_in_slot(slot_addr)); break;
306 case T_OBJECT: value->l = (jobject)*oop_addr_in_slot(slot_addr); break;
307 default: ShouldNotReachHere();
308 }
309 }
310 static void set_jvalue_in_slot(intptr_t* slot_addr, BasicType type, jvalue* value) {
311 switch (type) {
312 case T_BOOLEAN: *int_addr_in_slot(slot_addr) = (value->z != 0); break;
313 case T_CHAR: *int_addr_in_slot(slot_addr) = value->c; break;
314 case T_BYTE: *int_addr_in_slot(slot_addr) = value->b; break;
315 case T_SHORT: *int_addr_in_slot(slot_addr) = value->s; break;
316 case T_INT: *int_addr_in_slot(slot_addr) = value->i; break;
317 case T_LONG: set_long_in_slot(slot_addr, value->j); break;
318 case T_FLOAT: *(jfloat*)int_addr_in_slot(slot_addr) = value->f; break;
319 case T_DOUBLE: set_long_in_slot(slot_addr, jlong_cast(value->d)); break;
320 case T_OBJECT: *oop_addr_in_slot(slot_addr) = (oop) value->l; break;
321 default: ShouldNotReachHere();
322 }
323 }
324
325 static void initialize_method_handle_entries();
326 };
327
328 //------------------------------------------------------------------------------------------------------------------------
329 // The interpreter generator.
330
331 class Template;
332 class AbstractInterpreterGenerator: public StackObj {
333 protected:
334 InterpreterMacroAssembler* _masm;
335
336 public:
337 AbstractInterpreterGenerator(StubQueue* _code);
338 };
339
340 #endif // SHARE_VM_INTERPRETER_ABSTRACTINTERPRETER_HPP