1 /*
2 * Copyright (c) 2011, 2015, 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.
22 */
23
24 package jdk.vm.ci.hotspot;
25
26 import static jdk.vm.ci.common.InitTimer.timer;
27 import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime;
28
29 import java.lang.reflect.Executable;
30 import java.lang.reflect.Field;
31
32 import jdk.vm.ci.code.BytecodeFrame;
33 import jdk.vm.ci.code.InstalledCode;
34 import jdk.vm.ci.code.InvalidInstalledCodeException;
35 import jdk.vm.ci.code.TargetDescription;
36 import jdk.vm.ci.code.stack.InspectedFrameVisitor;
37 import jdk.vm.ci.common.InitTimer;
38 import jdk.vm.ci.common.JVMCIError;
39 import jdk.vm.ci.meta.JavaType;
40 import jdk.vm.ci.meta.ResolvedJavaMethod;
41 import jdk.vm.ci.meta.ResolvedJavaType;
42
43 /**
44 * Calls from Java into HotSpot. The behavior of all the methods in this class that take a native
45 * pointer as an argument (e.g., {@link #getSymbol(long)}) is undefined if the argument does not
46 * denote a valid native object.
47 */
48 final class CompilerToVM {
49 /**
50 * Initializes the native part of the JVMCI runtime.
51 */
52 private static native void registerNatives();
53
54 static {
55 initialize();
56 }
57
58 @SuppressWarnings("try")
59 private static void initialize() {
60 try (InitTimer t = timer("CompilerToVM.registerNatives")) {
61 registerNatives();
62 }
63 }
64
65 /**
66 * Gets the {@link CompilerToVM} instance associated with the singleton
67 * {@link HotSpotJVMCIRuntime} instance.
68 */
69 public static CompilerToVM compilerToVM() {
70 return runtime().getCompilerToVM();
71 }
72
73 /**
74 * Copies the original bytecode of {@code method} into a new byte array and returns it.
75 *
76 * @return a new byte array containing the original bytecode of {@code method}
77 */
78 native byte[] getBytecode(HotSpotResolvedJavaMethodImpl method);
79
80 /**
81 * Gets the number of entries in {@code method}'s exception handler table or 0 if it has no
82 * exception handler table.
83 */
84 native int getExceptionTableLength(HotSpotResolvedJavaMethodImpl method);
135 native HotSpotResolvedJavaMethodImpl findUniqueConcreteMethod(HotSpotResolvedObjectTypeImpl actualHolderType, HotSpotResolvedJavaMethodImpl method);
136
137 /**
138 * Gets the implementor for the interface class {@code type}.
139 *
140 * @return the implementor if there is a single implementor, {@code null} if there is no
141 * implementor, or {@code type} itself if there is more than one implementor
142 * @throws IllegalArgumentException if type is not an interface type
143 */
144 native HotSpotResolvedObjectTypeImpl getImplementor(HotSpotResolvedObjectTypeImpl type);
145
146 /**
147 * Determines if {@code method} is ignored by security stack walks.
148 */
149 native boolean methodIsIgnoredBySecurityStackWalk(HotSpotResolvedJavaMethodImpl method);
150
151 /**
152 * Converts a name to a type.
153 *
154 * @param name a well formed Java type in {@linkplain JavaType#getName() internal} format
155 * @param accessingClass the context of resolution (must not be null)
156 * @param resolve force resolution to a {@link ResolvedJavaType}. If true, this method will
157 * either return a {@link ResolvedJavaType} or throw an exception
158 * @return the type for {@code name} or 0 if resolution failed and {@code resolve == false}
159 * @throws ClassNotFoundException if {@code resolve == true} and the resolution failed
160 */
161 native HotSpotResolvedObjectTypeImpl lookupType(String name, Class<?> accessingClass, boolean resolve) throws ClassNotFoundException;
162
163 /**
164 * Resolves the entry at index {@code cpi} in {@code constantPool} to an object.
165 *
166 * The behavior of this method is undefined if {@code cpi} does not denote one of the following
167 * entry types: {@code JVM_CONSTANT_MethodHandle}, {@code JVM_CONSTANT_MethodHandleInError},
168 * {@code JVM_CONSTANT_MethodType} and {@code JVM_CONSTANT_MethodTypeInError}.
169 */
170 native Object resolveConstantInPool(HotSpotConstantPool constantPool, int cpi);
171
172 /**
173 * Resolves the entry at index {@code cpi} in {@code constantPool} to an object, looking in the
174 * constant pool cache first.
175 *
176 * The behavior of this method is undefined if {@code cpi} does not denote a
177 * {@code JVM_CONSTANT_String} entry.
178 */
179 native Object resolvePossiblyCachedConstantInPool(HotSpotConstantPool constantPool, int cpi);
180
181 /**
182 * Gets the {@code JVM_CONSTANT_NameAndType} index from the entry at index {@code cpi} in
183 * {@code constantPool}.
184 *
185 * The behavior of this method is undefined if {@code cpi} does not denote an entry containing a
186 * {@code JVM_CONSTANT_NameAndType} index.
187 */
188 native int lookupNameAndTypeRefIndexInPool(HotSpotConstantPool constantPool, int cpi);
189
190 /**
191 * Gets the name of the {@code JVM_CONSTANT_NameAndType} entry referenced by another entry
192 * denoted by {@code which} in {@code constantPool}.
193 *
194 * The behavior of this method is undefined if {@code which} does not denote a entry that
195 * references a {@code JVM_CONSTANT_NameAndType} entry.
196 */
197 native String lookupNameInPool(HotSpotConstantPool constantPool, int which);
198
199 /**
301 * {@code JVM_CONSTANT_Field} entry.
302 *
303 * @param info an array in which the details of the field are returned
304 * @return the type defining the field if resolution is successful, 0 otherwise
305 */
306 native HotSpotResolvedObjectTypeImpl resolveFieldInPool(HotSpotConstantPool constantPool, int cpi, HotSpotResolvedJavaMethodImpl method, byte opcode, int[] info);
307
308 /**
309 * Converts {@code cpci} from an index into the cache for {@code constantPool} to an index
310 * directly into {@code constantPool}.
311 *
312 * The behavior of this method is undefined if {@code ccpi} is an invalid constant pool cache
313 * index.
314 */
315 native int constantPoolRemapInstructionOperandFromCache(HotSpotConstantPool constantPool, int cpci);
316
317 /**
318 * Gets the appendix object (if any) associated with the entry at index {@code cpi} in
319 * {@code constantPool}.
320 */
321 native Object lookupAppendixInPool(HotSpotConstantPool constantPool, int cpi);
322
323 /**
324 * Installs the result of a compilation into the code cache.
325 *
326 * @param target the target where this code should be installed
327 * @param compiledCode the result of a compilation
328 * @param code the details of the installed CodeBlob are written to this object
329 * @return the outcome of the installation which will be one of
330 * {@link HotSpotVMConfig#codeInstallResultOk},
331 * {@link HotSpotVMConfig#codeInstallResultCacheFull},
332 * {@link HotSpotVMConfig#codeInstallResultCodeTooLarge},
333 * {@link HotSpotVMConfig#codeInstallResultDependenciesFailed} or
334 * {@link HotSpotVMConfig#codeInstallResultDependenciesInvalid}.
335 * @throws JVMCIError if there is something wrong with the compiled code or the associated
336 * metadata.
337 */
338 native int installCode(TargetDescription target, HotSpotCompiledCode compiledCode, InstalledCode code, HotSpotSpeculationLog speculationLog);
339
340 /**
341 * Generates the VM metadata for some compiled code and copies them into {@code metaData}. This
342 * method does not install anything into the code cache.
343 *
344 * @param target the target where this code would be installed
345 * @param compiledCode the result of a compilation
346 * @param metaData the metadata is written to this object
347 * @return the outcome of the installation which will be one of
348 * {@link HotSpotVMConfig#codeInstallResultOk},
349 * {@link HotSpotVMConfig#codeInstallResultCacheFull},
350 * {@link HotSpotVMConfig#codeInstallResultCodeTooLarge},
351 * {@link HotSpotVMConfig#codeInstallResultDependenciesFailed} or
352 * {@link HotSpotVMConfig#codeInstallResultDependenciesInvalid}.
353 * @throws JVMCIError if there is something wrong with the compiled code or the metadata
354 */
355 native int getMetadata(TargetDescription target, HotSpotCompiledCode compiledCode, HotSpotMetaData metaData);
356
357 /**
358 * Resets all compilation statistics.
416 */
417 native long getMaxCallTargetOffset(long address);
418
419 /**
420 * Gets a textual disassembly of {@code codeBlob}.
421 *
422 * @return a non-zero length string containing a disassembly of {@code codeBlob} or null if
423 * {@code codeBlob} could not be disassembled for some reason
424 */
425 // The HotSpot disassembler seems not to be thread safe so it's better to synchronize its usage
426 synchronized native String disassembleCodeBlob(InstalledCode installedCode);
427
428 /**
429 * Gets a stack trace element for {@code method} at bytecode index {@code bci}.
430 */
431 native StackTraceElement getStackTraceElement(HotSpotResolvedJavaMethodImpl method, int bci);
432
433 /**
434 * Executes some {@code installedCode} with arguments {@code args}.
435 *
436 * @return the result of executing {@code installedCode}
437 * @throws InvalidInstalledCodeException if {@code installedCode} has been invalidated
438 */
439 native Object executeInstalledCode(Object[] args, InstalledCode installedCode) throws InvalidInstalledCodeException;
440
441 /**
442 * Gets the line number table for {@code method}. The line number table is encoded as (bci,
443 * source line number) pairs.
444 *
445 * @return the line number table for {@code method} or null if it doesn't have one
446 */
447 native long[] getLineNumberTable(HotSpotResolvedJavaMethodImpl method);
448
449 /**
450 * Gets the number of entries in the local variable table for {@code method}.
451 *
452 * @return the number of entries in the local variable table for {@code method}
453 */
454 native int getLocalVariableTableLength(HotSpotResolvedJavaMethodImpl method);
455
456 /**
457 * Gets the address of the first entry in the local variable table for {@code method}.
458 *
459 * Each entry is a native object described by these fields:
460 *
461 * <ul>
462 * <li>{@link HotSpotVMConfig#localVariableTableElementSize}</li>
463 * <li>{@link HotSpotVMConfig#localVariableTableElementLengthOffset}</li>
464 * <li>{@link HotSpotVMConfig#localVariableTableElementNameCpIndexOffset}</li>
465 * <li>{@link HotSpotVMConfig#localVariableTableElementDescriptorCpIndexOffset}</li>
466 * <li>{@link HotSpotVMConfig#localVariableTableElementSlotOffset}
467 * <li>{@link HotSpotVMConfig#localVariableTableElementStartBciOffset}
468 * </ul>
469 *
470 * @return 0 if {@code method} does not have a local variable table
471 */
472 native long getLocalVariableTableStart(HotSpotResolvedJavaMethodImpl method);
473
474 /**
475 * Sets flags on {@code method} indicating that it should never be inlined or compiled by the
476 * VM.
477 */
478 native void setNotInlinableOrCompilable(HotSpotResolvedJavaMethodImpl method);
479
480 /**
481 * Invalidates the profiling information for {@code method} and (re)initializes it such that
482 * profiling restarts upon its next invocation.
483 */
484 native void reprofile(HotSpotResolvedJavaMethodImpl method);
485
486 /**
487 * Invalidates {@code installedCode} such that {@link InvalidInstalledCodeException} will be
488 * raised the next time {@code installedCode} is executed.
489 */
490 native void invalidateInstalledCode(InstalledCode installedCode);
491
492 /**
493 * Collects the current values of all JVMCI benchmark counters, summed up over all threads.
494 */
495 native long[] collectCounters();
496
497 /**
498 * Determines if {@code metaspaceMethodData} is mature.
499 */
500 native boolean isMature(long metaspaceMethodData);
501
502 /**
503 * Generate a unique id to identify the result of the compile.
504 */
505 native int allocateCompileId(HotSpotResolvedJavaMethodImpl method, int entryBCI);
506
507 /**
508 * Determines if {@code method} has OSR compiled code identified by {@code entryBCI} for
509 * compilation level {@code level}.
510 */
555 /**
556 * Flush HotSpot's log stream.
557 */
558 native void flushDebugOutput();
559
560 /**
561 * Read a HotSpot Method* value from the memory location described by {@code base} plus
562 * {@code displacement} and return the {@link HotSpotResolvedJavaMethodImpl} wrapping it. This
563 * method does no checking that the memory location actually contains a valid pointer and may
564 * crash the VM if an invalid location is provided. If the {@code base} is null then
565 * {@code displacement} is used by itself. If {@code base} is a
566 * {@link HotSpotResolvedJavaMethodImpl}, {@link HotSpotConstantPool} or
567 * {@link HotSpotResolvedObjectTypeImpl} then the metaspace pointer is fetched from that object
568 * and added to {@code displacement}. Any other non-null object type causes an
569 * {@link IllegalArgumentException} to be thrown.
570 *
571 * @param base an object to read from or null
572 * @param displacement
573 * @return null or the resolved method for this location
574 */
575 native HotSpotResolvedJavaMethodImpl getResolvedJavaMethod(Object base, long displacement);
576
577 /**
578 * Gets the {@code ConstantPool*} associated with {@code object} and returns a
579 * {@link HotSpotConstantPool} wrapping it.
580 *
581 * @param object a {@link HotSpotResolvedJavaMethodImpl} or
582 * {@link HotSpotResolvedObjectTypeImpl} object
583 * @return a {@link HotSpotConstantPool} wrapping the {@code ConstantPool*} associated with
584 * {@code object}
585 * @throws NullPointerException if {@code object == null}
586 * @throws IllegalArgumentException if {@code object} is neither a
587 * {@link HotSpotResolvedJavaMethodImpl} nor a {@link HotSpotResolvedObjectTypeImpl}
588 */
589 native HotSpotConstantPool getConstantPool(Object object);
590
591 /**
592 * Read a HotSpot Klass* value from the memory location described by {@code base} plus
593 * {@code displacement} and return the {@link HotSpotResolvedObjectTypeImpl} wrapping it. This
594 * method does no checking that the memory location actually contains a valid pointer and may
595 * crash the VM if an invalid location is provided. If the {@code base} is null then
596 * {@code displacement} is used by itself. If {@code base} is a
597 * {@link HotSpotResolvedJavaMethodImpl}, {@link HotSpotConstantPool} or
598 * {@link HotSpotResolvedObjectTypeImpl} then the metaspace pointer is fetched from that object
599 * and added to {@code displacement}. Any other non-null object type causes an
600 * {@link IllegalArgumentException} to be thrown.
601 *
602 * @param base an object to read from or null
603 * @param displacement
604 * @param compressed true if the location contains a compressed Klass*
605 * @return null or the resolved method for this location
606 */
607 native HotSpotResolvedObjectTypeImpl getResolvedJavaType(Object base, long displacement, boolean compressed);
608
609 /**
610 * Return the size of the HotSpot ProfileData* pointed at by {@code position}. If
611 * {@code position} is outside the space of the MethodData then an
612 * {@link IllegalArgumentException} is thrown. A {@code position} inside the MethodData but that
613 * isn't pointing at a valid ProfileData will crash the VM.
614 *
615 * @param metaspaceMethodData
616 * @param position
617 * @return the size of the ProfileData item pointed at by {@code position}
618 * @throws IllegalArgumentException if an out of range position is given
619 */
620 native int methodDataProfileDataSize(long metaspaceMethodData, int position);
621
622 /**
623 * Gets the fingerprint for a given Klass*.
624 *
625 * @param metaspaceKlass
626 * @return the value of the fingerprint (zero for arrays and synthetic classes).
627 */
628 native long getFingerprint(long metaspaceKlass);
629
630 /**
631 * Return the amount of native stack required for the interpreter frames represented by
632 * {@code frame}. This is used when emitting the stack banging code to ensure that there is
633 * enough space for the frames during deoptimization.
634 *
635 * @param frame
636 * @return the number of bytes required for deoptimization of this frame state
637 */
638 native int interpreterFrameSize(BytecodeFrame frame);
639
640 /**
641 * Invokes non-public method {@code java.lang.invoke.LambdaForm.compileToBytecode()} on
642 * {@code lambdaForm} (which must be a {@code java.lang.invoke.LambdaForm} instance).
643 */
644 native void compileToBytecode(Object lambdaForm);
645
646 /**
647 * Gets the value of the VM flag named {@code name}.
648 *
649 * @param name name of a VM option
650 * @return {@code this} if the named VM option doesn't exist, a {@link String} or {@code null}
651 * if its type is {@code ccstr} or {@code ccstrlist}, a {@link Double} if its type is
652 * {@code double}, a {@link Boolean} if its type is {@code bool} otherwise a
653 * {@link Long}
654 */
655 native Object getFlagValue(String name);
656
657 /**
658 * Gets the host class for {@code type}.
659 */
660 native HotSpotResolvedObjectTypeImpl getHostClass(HotSpotResolvedObjectTypeImpl type);
661
662 /**
663 * Gets a {@link Executable} corresponding to {@code method}.
664 */
665 native Executable asReflectionExecutable(HotSpotResolvedJavaMethodImpl method);
666
667 /**
668 * Gets a {@link Field} denoted by {@code holder} and {@code index}.
669 *
670 * @param holder the class in which the requested field is declared
671 * @param fieldIndex the {@code fieldDescriptor::index()} denoting the field
672 */
673 native Field asReflectionField(HotSpotResolvedObjectTypeImpl holder, int fieldIndex);
674 }
|
1 /*
2 * Copyright (c) 2011, 2019, 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.
22 */
23
24 package jdk.vm.ci.hotspot;
25
26 import static jdk.vm.ci.common.InitTimer.timer;
27 import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime;
28
29 import java.lang.reflect.Executable;
30 import java.lang.reflect.Field;
31
32 import jdk.vm.ci.code.BytecodeFrame;
33 import jdk.vm.ci.code.InstalledCode;
34 import jdk.vm.ci.code.InvalidInstalledCodeException;
35 import jdk.vm.ci.code.TargetDescription;
36 import jdk.vm.ci.code.stack.InspectedFrameVisitor;
37 import jdk.vm.ci.common.InitTimer;
38 import jdk.vm.ci.common.JVMCIError;
39 import jdk.vm.ci.meta.Constant;
40 import jdk.vm.ci.meta.ConstantReflectionProvider;
41 import jdk.vm.ci.meta.JavaConstant;
42 import jdk.vm.ci.meta.JavaKind;
43 import jdk.vm.ci.meta.JavaType;
44 import jdk.vm.ci.meta.ResolvedJavaMethod;
45 import jdk.vm.ci.meta.ResolvedJavaType;
46
47 /**
48 * Calls from Java into HotSpot. The behavior of all the methods in this class that take a native
49 * pointer as an argument (e.g., {@link #getSymbol(long)}) is undefined if the argument does not
50 * denote a valid native object.
51 */
52 final class CompilerToVM {
53 /**
54 * Initializes the native part of the JVMCI runtime.
55 */
56 private static native void registerNatives();
57
58 /**
59 * These values mirror the equivalent values from {@link Unsafe} but are approriate for the JVM
60 * being compiled against.
61 */
62 // Checkstyle: stop
63 final int ARRAY_BOOLEAN_BASE_OFFSET;
64 final int ARRAY_BYTE_BASE_OFFSET;
65 final int ARRAY_SHORT_BASE_OFFSET;
66 final int ARRAY_CHAR_BASE_OFFSET;
67 final int ARRAY_INT_BASE_OFFSET;
68 final int ARRAY_LONG_BASE_OFFSET;
69 final int ARRAY_FLOAT_BASE_OFFSET;
70 final int ARRAY_DOUBLE_BASE_OFFSET;
71 final int ARRAY_OBJECT_BASE_OFFSET;
72 final int ARRAY_BOOLEAN_INDEX_SCALE;
73 final int ARRAY_BYTE_INDEX_SCALE;
74 final int ARRAY_SHORT_INDEX_SCALE;
75 final int ARRAY_CHAR_INDEX_SCALE;
76 final int ARRAY_INT_INDEX_SCALE;
77 final int ARRAY_LONG_INDEX_SCALE;
78 final int ARRAY_FLOAT_INDEX_SCALE;
79 final int ARRAY_DOUBLE_INDEX_SCALE;
80 final int ARRAY_OBJECT_INDEX_SCALE;
81 // Checkstyle: resume
82
83 @SuppressWarnings("try")
84 CompilerToVM() {
85 try (InitTimer t = timer("CompilerToVM.registerNatives")) {
86 registerNatives();
87 ARRAY_BOOLEAN_BASE_OFFSET = arrayBaseOffset(JavaKind.Boolean);
88 ARRAY_BYTE_BASE_OFFSET = arrayBaseOffset(JavaKind.Byte);
89 ARRAY_SHORT_BASE_OFFSET = arrayBaseOffset(JavaKind.Short);
90 ARRAY_CHAR_BASE_OFFSET = arrayBaseOffset(JavaKind.Char);
91 ARRAY_INT_BASE_OFFSET = arrayBaseOffset(JavaKind.Int);
92 ARRAY_LONG_BASE_OFFSET = arrayBaseOffset(JavaKind.Long);
93 ARRAY_FLOAT_BASE_OFFSET = arrayBaseOffset(JavaKind.Float);
94 ARRAY_DOUBLE_BASE_OFFSET = arrayBaseOffset(JavaKind.Double);
95 ARRAY_OBJECT_BASE_OFFSET = arrayBaseOffset(JavaKind.Object);
96 ARRAY_BOOLEAN_INDEX_SCALE = arrayIndexScale(JavaKind.Boolean);
97 ARRAY_BYTE_INDEX_SCALE = arrayIndexScale(JavaKind.Byte);
98 ARRAY_SHORT_INDEX_SCALE = arrayIndexScale(JavaKind.Short);
99 ARRAY_CHAR_INDEX_SCALE = arrayIndexScale(JavaKind.Char);
100 ARRAY_INT_INDEX_SCALE = arrayIndexScale(JavaKind.Int);
101 ARRAY_LONG_INDEX_SCALE = arrayIndexScale(JavaKind.Long);
102 ARRAY_FLOAT_INDEX_SCALE = arrayIndexScale(JavaKind.Float);
103 ARRAY_DOUBLE_INDEX_SCALE = arrayIndexScale(JavaKind.Double);
104 ARRAY_OBJECT_INDEX_SCALE = arrayIndexScale(JavaKind.Object);
105 }
106 }
107
108 native int arrayBaseOffset(JavaKind kind);
109
110 native int arrayIndexScale(JavaKind kind);
111
112 /**
113 * Gets the {@link CompilerToVM} instance associated with the singleton
114 * {@link HotSpotJVMCIRuntime} instance.
115 */
116 public static CompilerToVM compilerToVM() {
117 return runtime().getCompilerToVM();
118 }
119
120 /**
121 * Copies the original bytecode of {@code method} into a new byte array and returns it.
122 *
123 * @return a new byte array containing the original bytecode of {@code method}
124 */
125 native byte[] getBytecode(HotSpotResolvedJavaMethodImpl method);
126
127 /**
128 * Gets the number of entries in {@code method}'s exception handler table or 0 if it has no
129 * exception handler table.
130 */
131 native int getExceptionTableLength(HotSpotResolvedJavaMethodImpl method);
182 native HotSpotResolvedJavaMethodImpl findUniqueConcreteMethod(HotSpotResolvedObjectTypeImpl actualHolderType, HotSpotResolvedJavaMethodImpl method);
183
184 /**
185 * Gets the implementor for the interface class {@code type}.
186 *
187 * @return the implementor if there is a single implementor, {@code null} if there is no
188 * implementor, or {@code type} itself if there is more than one implementor
189 * @throws IllegalArgumentException if type is not an interface type
190 */
191 native HotSpotResolvedObjectTypeImpl getImplementor(HotSpotResolvedObjectTypeImpl type);
192
193 /**
194 * Determines if {@code method} is ignored by security stack walks.
195 */
196 native boolean methodIsIgnoredBySecurityStackWalk(HotSpotResolvedJavaMethodImpl method);
197
198 /**
199 * Converts a name to a type.
200 *
201 * @param name a well formed Java type in {@linkplain JavaType#getName() internal} format
202 * @param accessingClass the context of resolution. A value of {@code null} implies that the
203 * class should be resolved with the class loader.
204 * @param resolve force resolution to a {@link ResolvedJavaType}. If true, this method will
205 * either return a {@link ResolvedJavaType} or throw an exception
206 * @return the type for {@code name} or 0 if resolution failed and {@code resolve == false}
207 * @throws ClassNotFoundException if {@code resolve == true} and the resolution failed
208 */
209 native HotSpotResolvedJavaType lookupType(String name, HotSpotResolvedObjectTypeImpl accessingClass, boolean resolve) throws ClassNotFoundException;
210
211 native HotSpotResolvedJavaType lookupClass(Class<?> javaClass);
212
213 /**
214 * Resolves the entry at index {@code cpi} in {@code constantPool} to an object.
215 *
216 * The behavior of this method is undefined if {@code cpi} does not denote one of the following
217 * entry types: {@code JVM_CONSTANT_MethodHandle}, {@code JVM_CONSTANT_MethodHandleInError},
218 * {@code JVM_CONSTANT_MethodType} and {@code JVM_CONSTANT_MethodTypeInError}.
219 */
220 native HotSpotObjectConstantImpl resolveConstantInPool(HotSpotConstantPool constantPool, int cpi);
221
222 /**
223 * Resolves the entry at index {@code cpi} in {@code constantPool} to an object, looking in the
224 * constant pool cache first.
225 *
226 * The behavior of this method is undefined if {@code cpi} does not denote a
227 * {@code JVM_CONSTANT_String} entry.
228 */
229 native HotSpotObjectConstantImpl resolvePossiblyCachedConstantInPool(HotSpotConstantPool constantPool, int cpi);
230
231 /**
232 * Gets the {@code JVM_CONSTANT_NameAndType} index from the entry at index {@code cpi} in
233 * {@code constantPool}.
234 *
235 * The behavior of this method is undefined if {@code cpi} does not denote an entry containing a
236 * {@code JVM_CONSTANT_NameAndType} index.
237 */
238 native int lookupNameAndTypeRefIndexInPool(HotSpotConstantPool constantPool, int cpi);
239
240 /**
241 * Gets the name of the {@code JVM_CONSTANT_NameAndType} entry referenced by another entry
242 * denoted by {@code which} in {@code constantPool}.
243 *
244 * The behavior of this method is undefined if {@code which} does not denote a entry that
245 * references a {@code JVM_CONSTANT_NameAndType} entry.
246 */
247 native String lookupNameInPool(HotSpotConstantPool constantPool, int which);
248
249 /**
351 * {@code JVM_CONSTANT_Field} entry.
352 *
353 * @param info an array in which the details of the field are returned
354 * @return the type defining the field if resolution is successful, 0 otherwise
355 */
356 native HotSpotResolvedObjectTypeImpl resolveFieldInPool(HotSpotConstantPool constantPool, int cpi, HotSpotResolvedJavaMethodImpl method, byte opcode, int[] info);
357
358 /**
359 * Converts {@code cpci} from an index into the cache for {@code constantPool} to an index
360 * directly into {@code constantPool}.
361 *
362 * The behavior of this method is undefined if {@code ccpi} is an invalid constant pool cache
363 * index.
364 */
365 native int constantPoolRemapInstructionOperandFromCache(HotSpotConstantPool constantPool, int cpci);
366
367 /**
368 * Gets the appendix object (if any) associated with the entry at index {@code cpi} in
369 * {@code constantPool}.
370 */
371 native HotSpotObjectConstantImpl lookupAppendixInPool(HotSpotConstantPool constantPool, int cpi);
372
373 /**
374 * Installs the result of a compilation into the code cache.
375 *
376 * @param target the target where this code should be installed
377 * @param compiledCode the result of a compilation
378 * @param code the details of the installed CodeBlob are written to this object
379 * @return the outcome of the installation which will be one of
380 * {@link HotSpotVMConfig#codeInstallResultOk},
381 * {@link HotSpotVMConfig#codeInstallResultCacheFull},
382 * {@link HotSpotVMConfig#codeInstallResultCodeTooLarge},
383 * {@link HotSpotVMConfig#codeInstallResultDependenciesFailed} or
384 * {@link HotSpotVMConfig#codeInstallResultDependenciesInvalid}.
385 * @throws JVMCIError if there is something wrong with the compiled code or the associated
386 * metadata.
387 */
388 native int installCode(TargetDescription target, HotSpotCompiledCode compiledCode, InstalledCode code, long failedSpeculationsAddress, byte[] speculations);
389
390 /**
391 * Generates the VM metadata for some compiled code and copies them into {@code metaData}. This
392 * method does not install anything into the code cache.
393 *
394 * @param target the target where this code would be installed
395 * @param compiledCode the result of a compilation
396 * @param metaData the metadata is written to this object
397 * @return the outcome of the installation which will be one of
398 * {@link HotSpotVMConfig#codeInstallResultOk},
399 * {@link HotSpotVMConfig#codeInstallResultCacheFull},
400 * {@link HotSpotVMConfig#codeInstallResultCodeTooLarge},
401 * {@link HotSpotVMConfig#codeInstallResultDependenciesFailed} or
402 * {@link HotSpotVMConfig#codeInstallResultDependenciesInvalid}.
403 * @throws JVMCIError if there is something wrong with the compiled code or the metadata
404 */
405 native int getMetadata(TargetDescription target, HotSpotCompiledCode compiledCode, HotSpotMetaData metaData);
406
407 /**
408 * Resets all compilation statistics.
466 */
467 native long getMaxCallTargetOffset(long address);
468
469 /**
470 * Gets a textual disassembly of {@code codeBlob}.
471 *
472 * @return a non-zero length string containing a disassembly of {@code codeBlob} or null if
473 * {@code codeBlob} could not be disassembled for some reason
474 */
475 // The HotSpot disassembler seems not to be thread safe so it's better to synchronize its usage
476 synchronized native String disassembleCodeBlob(InstalledCode installedCode);
477
478 /**
479 * Gets a stack trace element for {@code method} at bytecode index {@code bci}.
480 */
481 native StackTraceElement getStackTraceElement(HotSpotResolvedJavaMethodImpl method, int bci);
482
483 /**
484 * Executes some {@code installedCode} with arguments {@code args}.
485 *
486 * @return the result of executing {@code nmethodMirror}
487 * @throws InvalidInstalledCodeException if {@code nmethodMirror} has been invalidated
488 */
489 native Object executeHotSpotNmethod(Object[] args, HotSpotNmethod nmethodMirror) throws InvalidInstalledCodeException;
490
491 /**
492 * Gets the line number table for {@code method}. The line number table is encoded as (bci,
493 * source line number) pairs.
494 *
495 * @return the line number table for {@code method} or null if it doesn't have one
496 */
497 native long[] getLineNumberTable(HotSpotResolvedJavaMethodImpl method);
498
499 /**
500 * Gets the number of entries in the local variable table for {@code method}.
501 *
502 * @return the number of entries in the local variable table for {@code method}
503 */
504 native int getLocalVariableTableLength(HotSpotResolvedJavaMethodImpl method);
505
506 /**
507 * Gets the address of the first entry in the local variable table for {@code method}.
508 *
509 * Each entry is a native object described by these fields:
510 *
511 * <ul>
512 * <li>{@link HotSpotVMConfig#localVariableTableElementSize}</li>
513 * <li>{@link HotSpotVMConfig#localVariableTableElementLengthOffset}</li>
514 * <li>{@link HotSpotVMConfig#localVariableTableElementNameCpIndexOffset}</li>
515 * <li>{@link HotSpotVMConfig#localVariableTableElementDescriptorCpIndexOffset}</li>
516 * <li>{@link HotSpotVMConfig#localVariableTableElementSlotOffset}
517 * <li>{@link HotSpotVMConfig#localVariableTableElementStartBciOffset}
518 * </ul>
519 *
520 * @return 0 if {@code method} does not have a local variable table
521 */
522 native long getLocalVariableTableStart(HotSpotResolvedJavaMethodImpl method);
523
524 /**
525 * Reads an object pointer within a VM data structure. That is, any {@link VMField} whose
526 * {@link VMField#type type} is {@code "oop"} (e.g.,
527 * {@code Klass::_java_mirror}, {@code JavaThread::_threadObj}).
528 *
529 * Note that {@link Unsafe#getObject(Object, long)} cannot be used for this since it does a
530 * {@code narrowOop} read if the VM is using compressed oops whereas oops within VM data
531 * structures are (currently) always uncompressed.
532 *
533 * @param address address of an oop field within a VM data structure
534 */
535 native HotSpotObjectConstantImpl readUncompressedOop(long address);
536
537 /**
538 * Sets flags on {@code method} indicating that it should never be inlined or compiled by the
539 * VM.
540 */
541 native void setNotInlinableOrCompilable(HotSpotResolvedJavaMethodImpl method);
542
543 /**
544 * Invalidates the profiling information for {@code method} and (re)initializes it such that
545 * profiling restarts upon its next invocation.
546 */
547 native void reprofile(HotSpotResolvedJavaMethodImpl method);
548
549 /**
550 * Invalidates {@code nmethodMirror} such that {@link InvalidInstalledCodeException} will be
551 * raised the next time {@code nmethodMirror} is {@linkplain #executeHotSpotNmethod executed}.
552 * The {@code nmethod} associated with {@code nmethodMirror} is also made non-entrant and any
553 * current activations of the {@code nmethod} are deoptimized.
554 */
555 native void invalidateHotSpotNmethod(HotSpotNmethod nmethodMirror);
556
557 /**
558 * Collects the current values of all JVMCI benchmark counters, summed up over all threads.
559 */
560 native long[] collectCounters();
561
562 /**
563 * Determines if {@code metaspaceMethodData} is mature.
564 */
565 native boolean isMature(long metaspaceMethodData);
566
567 /**
568 * Generate a unique id to identify the result of the compile.
569 */
570 native int allocateCompileId(HotSpotResolvedJavaMethodImpl method, int entryBCI);
571
572 /**
573 * Determines if {@code method} has OSR compiled code identified by {@code entryBCI} for
574 * compilation level {@code level}.
575 */
620 /**
621 * Flush HotSpot's log stream.
622 */
623 native void flushDebugOutput();
624
625 /**
626 * Read a HotSpot Method* value from the memory location described by {@code base} plus
627 * {@code displacement} and return the {@link HotSpotResolvedJavaMethodImpl} wrapping it. This
628 * method does no checking that the memory location actually contains a valid pointer and may
629 * crash the VM if an invalid location is provided. If the {@code base} is null then
630 * {@code displacement} is used by itself. If {@code base} is a
631 * {@link HotSpotResolvedJavaMethodImpl}, {@link HotSpotConstantPool} or
632 * {@link HotSpotResolvedObjectTypeImpl} then the metaspace pointer is fetched from that object
633 * and added to {@code displacement}. Any other non-null object type causes an
634 * {@link IllegalArgumentException} to be thrown.
635 *
636 * @param base an object to read from or null
637 * @param displacement
638 * @return null or the resolved method for this location
639 */
640 native HotSpotResolvedJavaMethodImpl getResolvedJavaMethod(HotSpotObjectConstantImpl base, long displacement);
641
642 /**
643 * Gets the {@code ConstantPool*} associated with {@code object} and returns a
644 * {@link HotSpotConstantPool} wrapping it.
645 *
646 * @param object a {@link HotSpotResolvedJavaMethodImpl} or
647 * {@link HotSpotResolvedObjectTypeImpl} object
648 * @return a {@link HotSpotConstantPool} wrapping the {@code ConstantPool*} associated with
649 * {@code object}
650 * @throws NullPointerException if {@code object == null}
651 * @throws IllegalArgumentException if {@code object} is neither a
652 * {@link HotSpotResolvedJavaMethodImpl} nor a {@link HotSpotResolvedObjectTypeImpl}
653 */
654 native HotSpotConstantPool getConstantPool(MetaspaceObject object);
655
656 /**
657 * Read a HotSpot Klass* value from the memory location described by {@code base} plus
658 * {@code displacement} and return the {@link HotSpotResolvedObjectTypeImpl} wrapping it. This
659 * method does no checking that the memory location actually contains a valid pointer and may
660 * crash the VM if an invalid location is provided. If the {@code base} is null then
661 * {@code displacement} is used by itself. If {@code base} is a
662 * {@link HotSpotResolvedJavaMethodImpl}, {@link HotSpotConstantPool} or
663 * {@link HotSpotResolvedObjectTypeImpl} then the metaspace pointer is fetched from that object
664 * and added to {@code displacement}. Any other non-null object type causes an
665 * {@link IllegalArgumentException} to be thrown.
666 *
667 * @param base an object to read from or null
668 * @param displacement
669 * @param compressed true if the location contains a compressed Klass*
670 * @return null or the resolved method for this location
671 */
672 private native HotSpotResolvedObjectTypeImpl getResolvedJavaType0(Object base, long displacement, boolean compressed);
673
674 HotSpotResolvedObjectTypeImpl getResolvedJavaType(MetaspaceObject base, long displacement, boolean compressed) {
675 return getResolvedJavaType0(base, displacement, compressed);
676 }
677
678 HotSpotResolvedObjectTypeImpl getResolvedJavaType(HotSpotObjectConstantImpl base, long displacement, boolean compressed) {
679 return getResolvedJavaType0(base, displacement, compressed);
680 }
681
682 HotSpotResolvedObjectTypeImpl getResolvedJavaType(long displacement, boolean compressed) {
683 return getResolvedJavaType0(null, displacement, compressed);
684 }
685
686 /**
687 * Return the size of the HotSpot ProfileData* pointed at by {@code position}. If
688 * {@code position} is outside the space of the MethodData then an
689 * {@link IllegalArgumentException} is thrown. A {@code position} inside the MethodData but that
690 * isn't pointing at a valid ProfileData will crash the VM.
691 *
692 * @param metaspaceMethodData
693 * @param position
694 * @return the size of the ProfileData item pointed at by {@code position}
695 * @throws IllegalArgumentException if an out of range position is given
696 */
697 native int methodDataProfileDataSize(long metaspaceMethodData, int position);
698
699 /**
700 * Gets the fingerprint for a given Klass*.
701 *
702 * @param metaspaceKlass
703 * @return the value of the fingerprint (zero for arrays and synthetic classes).
704 */
705 native long getFingerprint(long metaspaceKlass);
706
707 /**
708 * Return the amount of native stack required for the interpreter frames represented by
709 * {@code frame}. This is used when emitting the stack banging code to ensure that there is
710 * enough space for the frames during deoptimization.
711 *
712 * @param frame
713 * @return the number of bytes required for deoptimization of this frame state
714 */
715 native int interpreterFrameSize(BytecodeFrame frame);
716
717 /**
718 * Invokes non-public method {@code java.lang.invoke.LambdaForm.compileToBytecode()} on
719 * {@code lambdaForm} (which must be a {@code java.lang.invoke.LambdaForm} instance).
720 */
721 native void compileToBytecode(HotSpotObjectConstantImpl lambdaForm);
722
723 /**
724 * Gets the value of the VM flag named {@code name}.
725 *
726 * @param name name of a VM option
727 * @return {@code this} if the named VM option doesn't exist, a {@link String} or {@code null}
728 * if its type is {@code ccstr} or {@code ccstrlist}, a {@link Double} if its type is
729 * {@code double}, a {@link Boolean} if its type is {@code bool} otherwise a
730 * {@link Long}
731 */
732 native Object getFlagValue(String name);
733
734 /**
735 * Gets the host class for {@code type}.
736 */
737 native HotSpotResolvedObjectTypeImpl getHostClass(HotSpotResolvedObjectTypeImpl type);
738
739 /**
740 * Gets the object at the address {@code oopAddress}.
741 *
742 * @param oopAddress a valid {@code oopDesc**} value
743 */
744 native Object getObjectAtAddress(long oopAddress);
745
746 /**
747 * @see ResolvedJavaType#getInterfaces()
748 */
749 native HotSpotResolvedObjectTypeImpl[] getInterfaces(HotSpotResolvedObjectTypeImpl type);
750
751 /**
752 * @see ResolvedJavaType#getComponentType()
753 */
754 native HotSpotResolvedJavaType getComponentType(HotSpotResolvedObjectTypeImpl type);
755
756 /**
757 * Forces initialization of {@code type}.
758 */
759 native void ensureInitialized(HotSpotResolvedObjectTypeImpl type);
760
761 /**
762 * Checks if {@code object} is a String and is an interned string value.
763 */
764 native boolean isInternedString(HotSpotObjectConstantImpl object);
765
766 /**
767 * Gets the {@linkplain System#identityHashCode(Object) identity} has code for the object
768 * represented by this constant.
769 */
770 native int getIdentityHashCode(HotSpotObjectConstantImpl object);
771
772 /**
773 * Converts a constant object representing a boxed primitive into a boxed primitive.
774 */
775 native Object unboxPrimitive(HotSpotObjectConstantImpl object);
776
777 /**
778 * Converts a boxed primitive into a JavaConstant representing the same value.
779 */
780 native HotSpotObjectConstantImpl boxPrimitive(Object source);
781
782 /**
783 * Gets the {@link ResolvedJavaMethod}s for all the constructors of the type {@code holder}.
784 */
785 native ResolvedJavaMethod[] getDeclaredConstructors(HotSpotResolvedObjectTypeImpl holder);
786
787 /**
788 * Gets the {@link ResolvedJavaMethod}s for all the non-constructor methods of the type
789 * {@code holder}.
790 */
791 native ResolvedJavaMethod[] getDeclaredMethods(HotSpotResolvedObjectTypeImpl holder);
792
793 /**
794 * Reads the current value of a static field.
795 */
796 native JavaConstant readFieldValue(HotSpotResolvedObjectTypeImpl resolvedObjectType, HotSpotResolvedJavaField field, boolean isVolatile);
797
798 /**
799 * Reads the current value of an instance field.
800 */
801 native JavaConstant readFieldValue(HotSpotObjectConstantImpl object, HotSpotResolvedJavaField field, boolean isVolatile);
802
803 /**
804 * @see ResolvedJavaType#isInstance(JavaConstant)
805 */
806 native boolean isInstance(HotSpotResolvedObjectTypeImpl holder, HotSpotObjectConstantImpl object);
807
808 /**
809 * @see ResolvedJavaType#isAssignableFrom(ResolvedJavaType)
810 */
811 native boolean isAssignableFrom(HotSpotResolvedObjectTypeImpl holder, HotSpotResolvedObjectTypeImpl otherType);
812
813 /**
814 * @see ConstantReflectionProvider#asJavaType(Constant)
815 */
816 native HotSpotResolvedJavaType asJavaType(HotSpotObjectConstantImpl object);
817
818 /**
819 * Converts a String constant into a String.
820 */
821 native String asString(HotSpotObjectConstantImpl object);
822
823 /**
824 * Compares the contents of {@code xHandle} and {@code yHandle} for pointer equality.
825 */
826 native boolean equals(HotSpotObjectConstantImpl x, long xHandle, HotSpotObjectConstantImpl y, long yHandle);
827
828 /**
829 * Gets a {@link JavaConstant} wrapping the {@link java.lang.Class} mirror for {@code type}.
830 */
831 native HotSpotObjectConstantImpl getJavaMirror(HotSpotResolvedJavaType type);
832
833 /**
834 * Returns the length of the array if {@code object} represents an array or -1 otherwise.
835 */
836 native int getArrayLength(HotSpotObjectConstantImpl object);
837
838 /**
839 * Reads the element at {@code index} if {@code object} is an array. Elements of an object array
840 * are returned as {@link JavaConstant}s and primitives are returned as boxed values. The value
841 * {@code null} is returned if the {@code index} is out of range or object is not an array.
842 */
843 native Object readArrayElement(HotSpotObjectConstantImpl object, int index);
844
845 /**
846 * Reads a byte sized value from {@code displacement} in {@code object}.
847 */
848 native byte getByte(HotSpotObjectConstantImpl object, long displacement);
849
850 /**
851 * Reads a short sized value from {@code displacement} in {@code object}.
852 */
853 native short getShort(HotSpotObjectConstantImpl object, long displacement);
854
855 /**
856 * Reads an int sized value from {@code displacement} in {@code object}.
857 */
858 native int getInt(HotSpotObjectConstantImpl object, long displacement);
859
860 /**
861 * Reads a long sized value from {@code displacement} in {@code object}.
862 */
863 native long getLong(HotSpotObjectConstantImpl object, long displacement);
864
865 /**
866 * Reads a Java object from {@code displacement} in {@code object}.
867 */
868 native HotSpotObjectConstantImpl getObject(HotSpotObjectConstantImpl object, long displacement);
869
870 /**
871 * @see HotSpotJVMCIRuntime#registerNativeMethods
872 */
873 native long[] registerNativeMethods(Class<?> clazz);
874
875 /**
876 * @see HotSpotJVMCIRuntime#translate(Object)
877 */
878 native long translate(Object obj);
879
880 /**
881 * @see HotSpotJVMCIRuntime#unhand(Class, long)
882 */
883 native Object unhand(long handle);
884
885 /**
886 * Updates {@code address} and {@code entryPoint} fields of {@code nmethodMirror} based on the
887 * current state of the {@code nmethod} identified by {@code address} and
888 * {@code nmethodMirror.compileId} in the code cache.
889 */
890 native void updateHotSpotNmethod(HotSpotNmethod nmethodMirror);
891
892 /**
893 * @see InstalledCode#getCode()
894 */
895 native byte[] getCode(HotSpotInstalledCode code);
896
897 /**
898 * Gets a {@link Executable} corresponding to {@code method}.
899 */
900 native Executable asReflectionExecutable(HotSpotResolvedJavaMethodImpl method);
901
902 /**
903 * Gets a {@link Field} denoted by {@code holder} and {@code index}.
904 *
905 * @param holder the class in which the requested field is declared
906 * @param fieldIndex the {@code fieldDescriptor::index()} denoting the field
907 */
908 native Field asReflectionField(HotSpotResolvedObjectTypeImpl holder, int fieldIndex);
909
910 /**
911 * @see HotSpotJVMCIRuntime#getIntrinsificationTrustPredicate(Class...)
912 */
913 native boolean isTrustedForIntrinsics(HotSpotResolvedObjectTypeImpl type);
914
915 /**
916 * Releases the resources backing the global JNI {@code handle}. This is equivalent to the
917 * {@code DeleteGlobalRef} JNI function.
918 */
919 native void deleteGlobalHandle(long handle);
920
921 /**
922 * Gets the failed speculations pointed to by {@code *failedSpeculationsAddress}.
923 *
924 * @param currentFailures the known failures at {@code failedSpeculationsAddress}
925 * @return the list of failed speculations with each entry being a single speculation in the
926 * format emitted by {@link HotSpotSpeculationEncoding#toByteArray()}
927 */
928 native byte[][] getFailedSpeculations(long failedSpeculationsAddress, byte[][] currentFailures);
929
930 /**
931 * Gets the address of the {@code MethodData::_failed_speculations} field in the
932 * {@code MethodData} associated with {@code method}. This will create and install the
933 * {@code MethodData} if it didn't already exist.
934 */
935 native long getFailedSpeculationsAddress(HotSpotResolvedJavaMethodImpl method);
936
937 /**
938 * Frees the failed speculations pointed to by {@code *failedSpeculationsAddress}.
939 */
940 native void releaseFailedSpeculations(long failedSpeculationsAddress);
941
942 /**
943 * Adds a speculation to the failed speculations pointed to by
944 * {@code *failedSpeculationsAddress}.
945 *
946 * @return {@code false} if the speculation could not be appended to the list
947 */
948 native boolean addFailedSpeculation(long failedSpeculationsAddress, byte[] speculation);
949
950 }
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