1 /*
2 * Copyright (c) 2024, 2026, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package jdk.incubator.code.internal;
27
28 import com.sun.source.tree.LambdaExpressionTree;
29 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
30 import com.sun.tools.javac.code.Kinds.Kind;
31 import com.sun.tools.javac.code.Symbol;
32 import com.sun.tools.javac.code.Symbol.ClassSymbol;
33 import com.sun.tools.javac.code.Symbol.MethodSymbol;
34 import com.sun.tools.javac.code.Symbol.TypeVariableSymbol;
35 import com.sun.tools.javac.code.Symbol.VarSymbol;
36 import com.sun.tools.javac.code.Symtab;
37 import com.sun.tools.javac.code.Type;
38 import com.sun.tools.javac.code.Type.ArrayType;
39 import com.sun.tools.javac.code.Type.IntersectionClassType;
40 import com.sun.tools.javac.code.Type.MethodType;
41 import com.sun.tools.javac.code.Type.StructuralTypeMapping;
42 import com.sun.tools.javac.code.Type.TypeVar;
43 import com.sun.tools.javac.code.Type.UnionClassType;
44 import com.sun.tools.javac.code.TypeTag;
45 import com.sun.tools.javac.code.Types;
46 import com.sun.tools.javac.comp.AttrContext;
47 import com.sun.tools.javac.comp.CaptureScanner;
48 import com.sun.tools.javac.comp.DeferredAttr.FilterScanner;
49 import com.sun.tools.javac.comp.Env;
50 import com.sun.tools.javac.comp.Flow;
51 import com.sun.tools.javac.comp.Lower;
52 import com.sun.tools.javac.comp.CodeReflectionTransformer;
53 import com.sun.tools.javac.comp.TypeEnvs;
54 import com.sun.tools.javac.file.PathFileObject;
55 import com.sun.tools.javac.jvm.ByteCodes;
56 import com.sun.tools.javac.jvm.Gen;
57 import com.sun.tools.javac.resources.CompilerProperties.*;
58 import com.sun.tools.javac.tree.JCTree;
59 import com.sun.tools.javac.tree.JCTree.JCAnnotation;
60 import com.sun.tools.javac.tree.JCTree.JCArrayAccess;
61 import com.sun.tools.javac.tree.JCTree.JCAssign;
62 import com.sun.tools.javac.tree.JCTree.JCBinary;
63 import com.sun.tools.javac.tree.JCTree.JCBlock;
64 import com.sun.tools.javac.tree.JCTree.JCCaseLabel;
65 import com.sun.tools.javac.tree.JCTree.JCClassDecl;
66 import com.sun.tools.javac.tree.JCTree.JCConstantCaseLabel;
67 import com.sun.tools.javac.tree.JCTree.JCDefaultCaseLabel;
68 import com.sun.tools.javac.tree.JCTree.JCExpression;
69 import com.sun.tools.javac.tree.JCTree.JCFieldAccess;
70 import com.sun.tools.javac.tree.JCTree.JCFunctionalExpression;
71 import com.sun.tools.javac.tree.JCTree.JCFunctionalExpression.CodeReflectionInfo;
72 import com.sun.tools.javac.tree.JCTree.JCIdent;
73 import com.sun.tools.javac.tree.JCTree.JCLambda;
74 import com.sun.tools.javac.tree.JCTree.JCLiteral;
75 import com.sun.tools.javac.tree.JCTree.JCMemberReference;
76 import com.sun.tools.javac.tree.JCTree.JCMemberReference.ReferenceKind;
77 import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
78 import com.sun.tools.javac.tree.JCTree.JCMethodInvocation;
79 import com.sun.tools.javac.tree.JCTree.JCModuleDecl;
80 import com.sun.tools.javac.tree.JCTree.JCNewArray;
81 import com.sun.tools.javac.tree.JCTree.JCNewClass;
82 import com.sun.tools.javac.tree.JCTree.JCReturn;
83 import com.sun.tools.javac.tree.JCTree.JCTypeCast;
84 import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
85 import com.sun.tools.javac.tree.JCTree.JCAssert;
86 import com.sun.tools.javac.tree.JCTree.Tag;
87 import com.sun.tools.javac.tree.TreeInfo;
88 import com.sun.tools.javac.tree.TreeMaker;
89 import com.sun.tools.javac.util.Assert;
90 import com.sun.tools.javac.util.Context;
91 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
92 import com.sun.tools.javac.util.ListBuffer;
93 import com.sun.tools.javac.util.Log;
94 import com.sun.tools.javac.util.Name;
95 import com.sun.tools.javac.util.Names;
96 import com.sun.tools.javac.util.Options;
97 import jdk.incubator.code.*;
98 import jdk.incubator.code.extern.DialectFactory;
99 import jdk.incubator.code.dialect.core.*;
100 import jdk.incubator.code.dialect.java.*;
101 import jdk.incubator.code.dialect.java.WildcardType.BoundKind;
102
103 import javax.lang.model.element.Modifier;
104 import javax.tools.JavaFileObject;
105 import java.lang.constant.ClassDesc;
106 import java.util.*;
107 import java.util.List;
108 import java.util.function.Function;
109 import java.util.function.Supplier;
110
111 import static com.sun.tools.javac.code.Flags.*;
112 import static com.sun.tools.javac.code.Kinds.Kind.MTH;
113 import static com.sun.tools.javac.code.Kinds.Kind.TYP;
114 import static com.sun.tools.javac.code.Kinds.Kind.VAR;
115 import static com.sun.tools.javac.code.TypeTag.BOT;
116 import static com.sun.tools.javac.code.TypeTag.CLASS;
117 import static com.sun.tools.javac.code.TypeTag.INT;
118 import static com.sun.tools.javac.code.TypeTag.METHOD;
119 import static com.sun.tools.javac.code.TypeTag.NONE;
120 import static com.sun.tools.javac.main.Option.G_CUSTOM;
121
122 import java.io.IOException;
123 import java.io.OutputStream;
124 import java.lang.classfile.ClassFile;
125 import java.lang.classfile.ClassTransform;
126 import java.lang.classfile.attribute.InnerClassInfo;
127 import java.lang.classfile.attribute.InnerClassesAttribute;
128 import java.lang.classfile.attribute.NestHostAttribute;
129 import java.lang.invoke.MethodHandles;
130 import javax.tools.JavaFileManager;
131 import javax.tools.StandardLocation;
132 import jdk.incubator.code.bytecode.BytecodeGenerator;
133
134 /**
135 * This a tree translator that adds the code model to all method declaration marked
136 * with the {@code Reflect} annotation. The model is expressed using the code
137 * reflection API (see {@code jdk.incubator.code}).
138 */
139 public class ReflectMethods extends TreeTranslatorPrev {
140 protected static final Context.Key<ReflectMethods> reflectMethodsKey = new Context.Key<>();
141
142 public static ReflectMethods instance(Context context) {
143 ReflectMethods instance = context.get(reflectMethodsKey);
144 if (instance == null)
145 instance = new ReflectMethods(context);
146 return instance;
147 }
148
149 private final Types types;
150 private final Names names;
151 private final Symtab syms;
152 private final Gen gen;
153 private final Log log;
154 private final Lower lower;
155 private final TypeEnvs typeEnvs;
156 private final Flow flow;
157 private final CodeReflectionSymbols crSyms;
158 private final boolean dumpIR;
159 private final boolean lineDebugInfo;
160 private final boolean reflectAll;
161
162 private TreeMaker make;
163 private ListBuffer<JCTree> opMethodDecls;
164 private SequencedMap<String, Op> ops;
165 private Symbol.ClassSymbol currentClassSym;
166 private Symbol.ClassSymbol codeModelsClassSym;
167 private int lambdaCount;
168 private boolean codeReflectionEnabled = false;
169 private final Map<Symbol, List<Symbol>> localCaptures = new HashMap<>();
170
171 @SuppressWarnings("this-escape")
172 protected ReflectMethods(Context context) {
173 context.put(reflectMethodsKey, this);
174 Options options = Options.instance(context);
175 dumpIR = options.isSet("dumpIR");
176 lineDebugInfo =
177 options.isUnset(G_CUSTOM) ||
178 options.isSet(G_CUSTOM, "lines");
179 reflectAll = options.isSet("reflectAll");
180 names = Names.instance(context);
181 syms = Symtab.instance(context);
182 types = Types.instance(context);
183 gen = Gen.instance(context);
184 log = Log.instance(context);
185 lower = Lower.instance(context);
186 typeEnvs = TypeEnvs.instance(context);
187 flow = Flow.instance(context);
188 crSyms = new CodeReflectionSymbols(context);
189 }
190
191 @Override
192 public void visitVarDef(JCVariableDecl tree) {
193 boolean prevCodeReflectionEnabled = codeReflectionEnabled;
194 try {
195 codeReflectionEnabled = codeReflectionEnabled ||
196 tree.sym.attribute(crSyms.codeReflectionType.tsym) != null;
197 super.visitVarDef(tree);
198 } finally {
199 codeReflectionEnabled = prevCodeReflectionEnabled;
200 }
201 }
202
203 boolean isInsideInnerOrLocalClass() {
204 return currentClassSym.type.getEnclosingType().hasTag(CLASS) ||
205 currentClassSym.isDirectlyOrIndirectlyLocal();
206 }
207
208 @Override
209 public void visitMethodDef(JCMethodDecl tree) {
210 boolean isReflectable = !tree.sym.isConstructor() && isReflectable(tree);
211 if (isReflectable) {
212 if (isInsideInnerOrLocalClass()) {
213 // Reflectable methods in local classes are not supported
214 log.warning(tree, Warnings.ReflectableMethodInnerClass(currentClassSym.enclClass()));
215 super.visitMethodDef(tree);
216 return;
217 } else {
218 // if the method is annotated, scan it
219 BodyScanner bodyScanner = new BodyScanner(tree);
220 CoreOp.FuncOp funcOp = bodyScanner.scanMethod();
221 if (dumpIR) {
222 // dump the method IR if requested
223 log.note(Notes.ReflectableMethodIrDump(tree.sym.enclClass(), tree.sym, funcOp.toText()));
224 }
225 // create a static method that returns the op
226 Name methodName = methodName(symbolToMethodRef(tree.sym));
227 opMethodDecls.add(opMethodDecl(methodName));
228 ops.put(methodName.toString(), funcOp);
229 }
230 }
231 boolean prevCodeReflectionEnabled = codeReflectionEnabled;
232 try {
233 codeReflectionEnabled = isReflectable;
234 super.visitMethodDef(tree);
235 } finally {
236 codeReflectionEnabled = prevCodeReflectionEnabled;
237 }
238 }
239
240 @Override
241 public void visitModuleDef(JCModuleDecl that) {
242 // do nothing
243 }
244
245 @Override
246 public void visitClassDef(JCClassDecl tree) {
247 ListBuffer<JCTree> prevOpMethodDecls = opMethodDecls;
248 SequencedMap<String, Op> prevOps = ops;
249 Symbol.ClassSymbol prevClassSym = currentClassSym;
250 Symbol.ClassSymbol prevCodeModelsClassSym = codeModelsClassSym;
251 int prevLambdaCount = lambdaCount;
252 JavaFileObject prev = log.useSource(tree.sym.sourcefile);
253 computeCapturesIfNeeded(tree);
254 try {
255 lambdaCount = 0;
256 currentClassSym = tree.sym;
257 opMethodDecls = new ListBuffer<>();
258 codeModelsClassSym = new ClassSymbol(0, names.fromString("$CM"), currentClassSym);
259 ops = new LinkedHashMap<>();
260 super.visitClassDef(tree);
261 if (!ops.isEmpty()) {
262 tree.defs = tree.defs.prependList(opMethodDecls.toList());
263 tree = new JCReflectMethodsClassDecl(tree, ops);
264 // store the tree for later phases
265 Env<AttrContext> classEnv = typeEnvs.get(tree.sym);
266 classEnv.tree = tree;
267 classEnv.enclClass = tree;
268 currentClassSym.members().enter(codeModelsClassSym);
269 }
270 } finally {
271 lambdaCount = prevLambdaCount;
272 opMethodDecls = prevOpMethodDecls;
273 ops = prevOps;
274 currentClassSym = prevClassSym;
275 codeModelsClassSym = prevCodeModelsClassSym;
276 result = tree;
277 log.useSource(prev);
278 }
279 }
280
281 void computeCapturesIfNeeded(JCClassDecl tree) {
282 if (tree.sym.isDirectlyOrIndirectlyLocal() && !localCaptures.containsKey(tree.sym)) {
283 // we need to keep track of captured locals using same strategy as Lower
284 class FreeVarScanner extends Lower.FreeVarCollector {
285 FreeVarScanner() {
286 lower.super(tree);
287 }
288
289 @Override
290 protected void addFreeVars(ClassSymbol c) {
291 localCaptures.getOrDefault(c, List.of())
292 .forEach(s -> addFreeVar((VarSymbol)s));
293 }
294 }
295 FreeVarScanner fvs = new FreeVarScanner();
296 localCaptures.put(tree.sym, List.copyOf(fvs.analyzeCaptures()));
297 }
298 }
299
300 @Override
301 public void visitLambda(JCLambda tree) {
302 boolean isReflectable = isReflectable(tree);
303 if (isReflectable) {
304 if (isInsideInnerOrLocalClass()) {
305 // Reflectable lambdas in local classes are not supported
306 log.warning(tree, Warnings.ReflectableLambdaInnerClass(currentClassSym.enclClass()));
307 super.visitLambda(tree);
308 return;
309 }
310
311 // quoted lambda - scan it
312 BodyScanner bodyScanner = new BodyScanner(tree);
313 CoreOp.FuncOp funcOp = bodyScanner.scanLambda();
314 if (dumpIR) {
315 // dump the method IR if requested
316 log.note(Notes.ReflectableLambdaIrDump(funcOp.toText()));
317 }
318 // create a static method that returns the FuncOp representing the lambda
319 Name lambdaName = lambdaName();
320 JCMethodDecl opMethod = opMethodDecl(lambdaName);
321 opMethodDecls.add(opMethod);
322 ops.put(lambdaName.toString(), funcOp);
323
324 // leave the lambda in place, but also leave a trail for LambdaToMethod
325 tree.codeReflectionInfo = new CodeReflectionInfo(opMethod.sym, crSyms.reflectableLambdaMetafactory);
326 }
327 boolean prevCodeReflectionEnabled = codeReflectionEnabled;
328 try {
329 codeReflectionEnabled = isReflectable;
330 super.visitLambda(tree);
331 } finally {
332 codeReflectionEnabled = prevCodeReflectionEnabled;
333 }
334 }
335
336 @Override
337 public void visitReference(JCMemberReference tree) {
338 MemberReferenceToLambda memberReferenceToLambda = new MemberReferenceToLambda(tree, currentClassSym);
339 JCLambda lambdaTree = memberReferenceToLambda.lambda();
340
341 if (isReflectable(tree)) {
342 if (isInsideInnerOrLocalClass()) {
343 // Reflectable method references in local classes are not supported
344 log.warning(tree, Warnings.ReflectableMrefInnerClass(currentClassSym.enclClass()));
345 super.visitReference(tree);
346 return;
347 }
348
349 // quoted lambda - scan it
350 BodyScanner bodyScanner = new BodyScanner(lambdaTree);
351 CoreOp.FuncOp funcOp = bodyScanner.scanLambda();
352 if (dumpIR) {
353 // dump the method IR if requested
354 log.note(Notes.ReflectableMrefIrDump(funcOp.toText()));
355 }
356 // create a method that returns the FuncOp representing the lambda
357 Name lambdaName = lambdaName();
358 ops.put(lambdaName.toString(), funcOp);
359 JCMethodDecl opMethod = opMethodDecl(lambdaName);
360 opMethodDecls.add(opMethod);
361 tree.codeReflectionInfo = new CodeReflectionInfo(opMethod.sym, crSyms.reflectableLambdaMetafactory);
362 }
363 super.visitReference(tree);
364 }
365
366 Name lambdaName() {
367 return names.fromString("lambda").append('$', names.fromString(String.valueOf(lambdaCount++)));
368 }
369
370 Name methodName(MethodRef method) {
371 char[] sigCh = method.toString().toCharArray();
372 for (int i = 0; i < sigCh.length; i++) {
373 switch (sigCh[i]) {
374 case '.', ';', '[', '/' -> sigCh[i] = '$';
375 }
376 }
377 return names.fromChars(sigCh, 0, sigCh.length);
378 }
379
380 // @@@ Retain enum for when we might add another storage to test
381 // and compare
382 private enum CodeModelStorageOption {
383 CODE_BUILDER;
384
385 public static CodeModelStorageOption parse(String s) {
386 if (s == null) {
387 return CodeModelStorageOption.CODE_BUILDER;
388 }
389 return CodeModelStorageOption.valueOf(s);
390 }
391 }
392
393 private JCMethodDecl opMethodDecl(Name methodName) {
394 var mt = new MethodType(com.sun.tools.javac.util.List.nil(), crSyms.opType,
395 com.sun.tools.javac.util.List.nil(), syms.methodClass);
396 var ms = new MethodSymbol(PRIVATE | STATIC | SYNTHETIC, methodName, mt, currentClassSym);
397 currentClassSym.members().enter(ms);
398
399 // Create the method body calling the synthetic inner class method of the same name
400 var body = make.Return(make.App(make.Ident(new MethodSymbol(PRIVATE | STATIC | SYNTHETIC, methodName, mt, codeModelsClassSym))));
401 var md = make.MethodDef(ms, make.Block(0, com.sun.tools.javac.util.List.of(body)));
402 return md;
403 }
404
405 public JCTree translateTopLevelClass(JCTree cdef, TreeMaker make) {
406 // note that this method does NOT support recursion.
407 this.make = make;
408 return translate(cdef);
409 }
410
411 public CoreOp.FuncOp getMethodBody(Symbol.ClassSymbol classSym, JCMethodDecl methodDecl, JCBlock attributedBody, TreeMaker make) {
412 // if the method is annotated, scan it
413 // Called from JavacElements::getBody
414 try {
415 this.make = make;
416 currentClassSym = classSym;
417 // same checks as in ReflectMethods::visitMethodDef
418 boolean isReflectable = !methodDecl.sym.isConstructor() && isReflectable(methodDecl);
419 if (isReflectable && !isInsideInnerOrLocalClass()) {
420 BodyScanner bodyScanner = new BodyScanner(methodDecl);
421 return bodyScanner.scanMethod(attributedBody);
422 } else {
423 return null;
424 }
425 } finally {
426 currentClassSym = null;
427 this.make = null;
428 }
429 }
430
431 static class BodyStack {
432 final BodyStack parent;
433
434 // Tree associated with body
435 final JCTree tree;
436
437 // Body to add blocks
438 final Body.Builder body;
439 // Current block to add operations
440 Block.Builder block;
441
442 // Map of symbols (method arguments and local variables) to varOp values
443 final Map<Symbol, Value> localToOp;
444
445 // Label
446 Map.Entry<String, Op.Result> label;
447
448 BodyStack(BodyStack parent, JCTree tree, FunctionType bodySignature) {
449 this.parent = parent;
450
451 this.tree = tree;
452
453 this.body = Body.Builder.of(parent != null ? parent.body : null, bodySignature);
454 this.block = body.entryBlock();
455
456 this.localToOp = new LinkedHashMap<>(); // order is important for captured values
457 }
458
459 public void setLabel(String labelName, Op.Result labelValue) {
460 if (label != null) {
461 throw new IllegalStateException("Label already defined: " + labelName);
462 }
463 label = Map.entry(labelName, labelValue);
464 }
465 }
466
467 class BodyScanner extends TreeScannerPrev {
468 private final JCTree tree;
469 private final Name name;
470 private final BodyStack top;
471 private BodyStack stack;
472 private Op lastOp;
473 private Value result;
474 private Type pt = Type.noType;
475 private final boolean isLambdaReflectable;
476 private Type bodyTarget;
477
478 BodyScanner(JCMethodDecl tree) {
479 this.tree = tree;
480 this.name = tree.name;
481 this.isLambdaReflectable = false;
482
483 List<CodeType> parameters = new ArrayList<>();
484 int blockArgOffset = 0;
485 // Instance methods model "this" as an additional argument occurring
486 // before all other arguments.
487 // @@@ Inner classes.
488 // We need to capture all "this", in nested order, as arguments.
489 if (!tree.getModifiers().getFlags().contains(Modifier.STATIC)) {
490 parameters.add(typeToCodeType(tree.sym.owner.type));
491 blockArgOffset++;
492 }
493 tree.sym.type.getParameterTypes().stream().map(ReflectMethods.this::typeToCodeType).forEach(parameters::add);
494
495 FunctionType bodySignature = CoreType.functionType(
496 typeToCodeType(tree.sym.type.getReturnType()), parameters);
497
498 this.stack = this.top = new BodyStack(null, tree.body, bodySignature);
499
500 // @@@ this as local variable? (it can never be stored to)
501 for (int i = 0 ; i < tree.params.size() ; i++) {
502 Op.Result paramOp = append(CoreOp.var(
503 tree.params.get(i).name.toString(),
504 top.block.parameters().get(blockArgOffset + i)));
505 top.localToOp.put(tree.params.get(i).sym, paramOp);
506 }
507
508 bodyTarget = tree.sym.type.getReturnType();
509 }
510
511 BodyScanner(JCLambda tree) {
512 this.tree = tree;
513 this.name = names.fromString("quotedLambda");
514 this.isLambdaReflectable = true;
515
516 ReflectableLambdaCaptureScanner lambdaCaptureScanner =
517 new ReflectableLambdaCaptureScanner(tree);
518
519 List<VarSymbol> capturedSymbols = lambdaCaptureScanner.analyzeCaptures();
520 int blockParamOffset = 0;
521
522 ListBuffer<Type> capturedTypes = new ListBuffer<>();
523 if (lambdaCaptureScanner.capturesThis) {
524 capturedTypes.add(currentClassSym.type);
525 blockParamOffset++;
526 }
527 for (Symbol s : capturedSymbols) {
528 capturedTypes.add(s.type);
529 }
530
531 FunctionType mtDesc = CoreType.functionType(CoreOp.QuotedOp.QUOTED_OP_TYPE,
532 capturedTypes.toList().map(ReflectMethods.this::typeToCodeType));
533
534 this.stack = this.top = new BodyStack(null, tree.body, mtDesc);
535
536 // add captured variables mappings
537 for (int i = 0 ; i < capturedSymbols.size() ; i++) {
538 Symbol capturedSymbol = capturedSymbols.get(i);
539 var capturedArg = top.block.parameters().get(blockParamOffset + i);
540 top.localToOp.put(capturedSymbol,
541 append(CoreOp.var(capturedSymbol.name.toString(), capturedArg)));
542 }
543
544 // add captured constant mappings
545 for (Map.Entry<Symbol, Object> constantCapture : lambdaCaptureScanner.constantCaptures.entrySet()) {
546 Symbol capturedSymbol = constantCapture.getKey();
547 var capturedArg = append(CoreOp.constant(typeToCodeType(capturedSymbol.type),
548 constantCapture.getValue()));
549 top.localToOp.put(capturedSymbol,
550 append(CoreOp.var(capturedSymbol.name.toString(), capturedArg)));
551 }
552
553 bodyTarget = tree.target.getReturnType();
554 }
555
556 /**
557 * Compute the set of local variables captured by a reflectable lambda expression.
558 * Inspired from LambdaToMethod's LambdaCaptureScanner.
559 */
560 class ReflectableLambdaCaptureScanner extends CaptureScanner {
561 boolean capturesThis;
562 Set<ClassSymbol> seenClasses = new HashSet<>();
563 Map<Symbol, Object> constantCaptures = new HashMap<>();
564
565 ReflectableLambdaCaptureScanner(JCLambda ownerTree) {
566 super(ownerTree);
567 }
568
569 @Override
570 public void visitClassDef(JCClassDecl tree) {
571 computeCapturesIfNeeded(tree);
572 seenClasses.add(tree.sym);
573 super.visitClassDef(tree);
574 }
575
576 @Override
577 public void visitIdent(JCIdent tree) {
578 if (!tree.sym.isStatic() &&
579 tree.sym.owner.kind == TYP &&
580 (tree.sym.kind == VAR || tree.sym.kind == MTH) &&
581 !seenClasses.contains(tree.sym.owner)) {
582 // a reference to an enclosing field or method, we need to capture 'this'
583 capturesThis = true;
584 } else if (tree.sym instanceof VarSymbol vsym &&
585 vsym.getConstValue() != null &&
586 !isVarSeen(vsym)) {
587 // record the constant value associated with this
588 constantCaptures.put(tree.sym, vsym.getConstValue());
589 } else {
590 // might be a local capture
591 super.visitIdent(tree);
592 }
593 }
594
595 @Override
596 public void visitSelect(JCFieldAccess tree) {
597 if (tree.sym.kind == VAR &&
598 (tree.sym.name == names._this ||
599 tree.sym.name == names._super) &&
600 !seenClasses.contains(tree.sym.type.tsym)) {
601 capturesThis = true;
602 }
603 super.visitSelect(tree);
604 }
605
606 @Override
607 public void visitNewClass(JCNewClass tree) {
608 super.visitNewClass(tree); // this might scan an anon class def, so we need to do that first
609 if (tree.type.tsym.isDirectlyOrIndirectlyLocal()) {
610 for (Symbol c : localCaptures.get(tree.type.tsym)) {
611 addFreeVar((VarSymbol) c);
612 }
613 }
614 if (tree.encl == null && tree.type.tsym.hasOuterInstance()) {
615 capturesThis = true;
616 }
617 }
618
619 @Override
620 public void visitAnnotation(JCAnnotation tree) {
621 // do nothing (annotation values look like captured instance fields)
622 }
623 }
624
625 void pushBody(JCTree tree, FunctionType bodySignature) {
626 stack = new BodyStack(stack, tree, bodySignature);
627 lastOp = null; // reset
628 }
629
630 void popBody() {
631 stack = stack.parent;
632 }
633
634 Value varOpValue(Symbol sym) {
635 BodyStack s = stack;
636 while (s != null) {
637 Value v = s.localToOp.get(sym);
638 if (v != null) {
639 return v;
640 }
641 s = s.parent;
642 }
643 throw new NoSuchElementException(sym.toString());
644 }
645
646 Value thisValue() { // @@@: outer this?
647 return top.block.parameters().get(0);
648 }
649
650 Value getLabel(String labelName) {
651 BodyStack s = stack;
652 while (s != null) {
653 if (s.label != null && s.label.getKey().equals(labelName)) {
654 return s.label.getValue();
655 }
656 s = s.parent;
657 }
658 throw new NoSuchElementException(labelName);
659 }
660
661 private DiagnosticPosition pos() {
662 JCTree current = currentNode();
663 return current != null ? current : tree;
664 }
665
666 private Op.Result append(Op op) {
667 return append(op, generateLocation(pos(), false), stack);
668 }
669
670 private Op.Result append(Op op, Op.Location l) {
671 return append(op, l, stack);
672 }
673
674 private Op.Result append(Op op, Op.Location l, BodyStack stack) {
675 lastOp = op;
676 op.setLocation(l);
677 return stack.block.add(op);
678 }
679
680 Op.Location generateLocation(DiagnosticPosition pos, boolean includeSourceReference) {
681 if (!lineDebugInfo) {
682 return Op.Location.NO_LOCATION;
683 }
684
685 int startPos = pos.getStartPosition();
686 int line = log.currentSource().getLineNumber(startPos);
687 int col = log.currentSource().getColumnNumber(startPos, false);
688 String path;
689 if (includeSourceReference) {
690 path = PathFileObject.getSimpleName(log.currentSourceFile());
691 } else {
692 path = null;
693 }
694 return new Op.Location(path, line, col);
695 }
696
697 private void appendReturnOrUnreachable(JCTree body) {
698 // Append only if an existing terminating operation is not present
699 if (lastOp == null || !(lastOp instanceof Op.Terminating)) {
700 // If control can continue after the body append return.
701 // Otherwise, append unreachable.
702 if (isAliveAfter(body)) {
703 append(CoreOp.return_());
704 } else {
705 append(CoreOp.unreachable());
706 }
707 }
708 }
709
710 private boolean isAliveAfter(JCTree node) {
711 return flow.aliveAfter(typeEnvs.get(currentClassSym), node, make);
712 }
713
714 private void appendTerminating(Supplier<Op.Terminating> sop) {
715 // Append only if an existing terminating operation is not present
716 if (lastOp == null || !(lastOp instanceof Op.Terminating)) {
717 append(sop.get());
718 }
719 }
720
721 public Value toValue(JCExpression expression, Type targetType) {
722 result = null; // reset
723 Type prevPt = pt;
724 try {
725 pt = targetType;
726 scan(expression);
727 return (result == null || targetType.hasTag(TypeTag.VOID) || targetType.hasTag(NONE)) ?
728 result : coerce(result, expression.type, targetType);
729 } finally {
730 pt = prevPt;
731 }
732 }
733
734 public Value toValue(JCExpression expression) {
735 return toValue(expression, Type.noType);
736 }
737
738 public Value toValue(JCTree.JCStatement statement) {
739 result = null; // reset
740 scan(statement);
741 return result;
742 }
743
744 Value coerce(Value sourceValue, Type sourceType, Type targetType) {
745 if (sourceType.isReference() && targetType.isReference() &&
746 !types.isSubtype(types.erasure(sourceType), types.erasure(targetType))) {
747 return append(JavaOp.cast(typeToCodeType(targetType), sourceValue));
748 }
749 return convert(sourceValue, targetType);
750 }
751
752 Value boxIfNeeded(Value exprVal) {
753 Type source = codeTypeToType(exprVal.type());
754 return source.hasTag(NONE) ?
755 exprVal : convert(exprVal, types.boxedTypeOrType(source));
756 }
757
758 Value unboxIfNeeded(Value exprVal) {
759 Type source = codeTypeToType(exprVal.type());
760 return source.hasTag(NONE) ?
761 exprVal : convert(exprVal, types.unboxedTypeOrType(source));
762 }
763
764 Value convert(Value exprVal, Type target) {
765 Type source = codeTypeToType(exprVal.type());
766 boolean sourcePrimitive = source.isPrimitive();
767 boolean targetPrimitive = target.isPrimitive();
768 if (target.hasTag(NONE)) {
769 return exprVal;
770 } else if (sourcePrimitive == targetPrimitive) {
771 if (!sourcePrimitive || types.isSameType(source, target)) {
772 return exprVal;
773 } else {
774 // implicit primitive conversion
775 return append(JavaOp.conv(typeToCodeType(target), exprVal));
776 }
777 } else if (sourcePrimitive) {
778 // we need to box
779 Type unboxedTarget = types.unboxedType(target);
780 if (!unboxedTarget.hasTag(NONE)) {
781 // non-Object target
782 if (!types.isConvertible(source, unboxedTarget)) {
783 exprVal = convert(exprVal, unboxedTarget);
784 }
785 return box(exprVal, target);
786 } else {
787 // Object target
788 return box(exprVal, types.boxedClass(source).type);
789 }
790 } else {
791 // we need to unbox
792 return unbox(exprVal, source, target, types.unboxedType(source));
793 }
794 }
795
796 Value box(Value valueExpr, Type box) {
797 // Boxing is a static method e.g., java.lang.Integer::valueOf(int)java.lang.Integer
798 MethodRef boxMethod = MethodRef.method(typeToCodeType(box), names.valueOf.toString(),
799 CoreType.functionType(typeToCodeType(box), typeToCodeType(types.unboxedType(box))));
800 return append(JavaOp.invoke(boxMethod, valueExpr));
801 }
802
803 Value unbox(Value valueExpr, Type box, Type primitive, Type unboxedType) {
804 if (unboxedType.hasTag(NONE)) {
805 // Object target, first downcast to correct wrapper type
806 unboxedType = primitive;
807 box = types.boxedClass(unboxedType).type;
808 valueExpr = append(JavaOp.cast(typeToCodeType(box), valueExpr));
809 }
810 // Unboxing is a virtual method e.g., java.lang.Integer::intValue()int
811 MethodRef unboxMethod = MethodRef.method(typeToCodeType(box),
812 unboxedType.tsym.name.append(names.Value).toString(),
813 CoreType.functionType(typeToCodeType(unboxedType)));
814 return append(JavaOp.invoke(unboxMethod, valueExpr));
815 }
816
817 @Override
818 public void visitVarDef(JCVariableDecl tree) {
819 JavaType javaType = typeToCodeType(tree.type);
820 if (tree.init != null) {
821 Value initOp = toValue(tree.init, tree.type);
822 result = append(CoreOp.var(tree.name.toString(), javaType, initOp));
823 } else {
824 // Uninitialized
825 result = append(CoreOp.var(tree.name.toString(), javaType));
826 }
827 stack.localToOp.put(tree.sym, result);
828 }
829
830 @Override
831 public void visitAssign(JCAssign tree) {
832 // Consume top node that applies to write access
833 JCTree lhs = TreeInfo.skipParens(tree.lhs);
834 Type target = tree.lhs.type;
835 switch (lhs.getTag()) {
836 case IDENT: {
837 JCIdent assign = (JCIdent) lhs;
838
839 // Scan the rhs, the assign expression result is its input
840 result = toValue(tree.rhs, target);
841
842 Symbol sym = assign.sym;
843 switch (sym.getKind()) {
844 case LOCAL_VARIABLE, PARAMETER, EXCEPTION_PARAMETER -> {
845 Value varOp = varOpValue(sym);
846 append(CoreOp.varStore(varOp, result));
847 }
848 case FIELD -> {
849 FieldRef fd = symbolToFieldRef(sym, symbolSiteType(sym));
850 if (sym.isStatic()) {
851 append(JavaOp.fieldStore(fd, result));
852 } else {
853 append(JavaOp.fieldStore(fd, thisValue(), result));
854 }
855 }
856 default -> throw unreachable();
857 }
858 break;
859 }
860 case SELECT: {
861 JCFieldAccess assign = (JCFieldAccess) lhs;
862
863 Value receiver = toValue(assign.selected);
864
865 // Scan the rhs, the assign expression result is its input
866 result = toValue(tree.rhs, target);
867
868 Symbol sym = assign.sym;
869 FieldRef fr = symbolToFieldRef(sym, assign.selected.type);
870 if (sym.isStatic()) {
871 append(JavaOp.fieldStore(fr, result));
872 } else {
873 append(JavaOp.fieldStore(fr, receiver, result));
874 }
875 break;
876 }
877 case INDEXED: {
878 JCArrayAccess assign = (JCArrayAccess) lhs;
879
880 Value array = toValue(assign.indexed);
881 Value index = toValue(assign.index, syms.intType);
882
883 // Scan the rhs, the assign expression result is its input
884 result = toValue(tree.rhs, target);
885
886 append(JavaOp.arrayStoreOp(array, index, result));
887 break;
888 }
889 default:
890 throw unreachable();
891 }
892 }
893
894 @Override
895 public void visitAssignop(JCTree.JCAssignOp tree) {
896 if (tree.operator.opcode == ByteCodes.string_add) {
897 // string concat
898 applyCompoundAssign(tree.lhs, lhs -> {
899 Type rhsType = tree.rhs.type;
900 Value rhs = toValue(tree.rhs,
901 rhsType.hasTag(BOT) ? syms.stringType : rhsType);
902 // lhs cannot have null type, no target type needed
903 Value assignOpResult = append(JavaOp.concat(lhs, rhs));
904 return result = convert(assignOpResult, tree.type);
905 });
906 } else {
907 // arithmetic op
908 applyCompoundAssign(tree.lhs, lhs -> {
909 Type lhsType = tree.operator.type.getParameterTypes().head;
910 Type rhsType = tree.operator.type.getParameterTypes().tail.head;
911
912 // We need to first convert LHS, then process RHS
913 // as described in JLS 15.26.2
914 lhs = convert(lhs, lhsType);
915 Value rhs = toValue(tree.rhs, rhsType);
916
917 Value assignOpResult = switch (tree.getTag()) {
918
919 // Arithmetic operations
920 case PLUS_ASG -> append(JavaOp.add(lhs, rhs));
921 case MINUS_ASG -> append(JavaOp.sub(lhs, rhs));
922 case MUL_ASG -> append(JavaOp.mul(lhs, rhs));
923 case DIV_ASG -> append(JavaOp.div(lhs, rhs));
924 case MOD_ASG -> append(JavaOp.mod(lhs, rhs));
925
926 // Bitwise operations (including their boolean variants)
927 case BITOR_ASG -> append(JavaOp.or(lhs, rhs));
928 case BITAND_ASG -> append(JavaOp.and(lhs, rhs));
929 case BITXOR_ASG -> append(JavaOp.xor(lhs, rhs));
930
931 // Shift operations
932 case SL_ASG -> append(JavaOp.lshl(lhs, rhs));
933 case SR_ASG -> append(JavaOp.ashr(lhs, rhs));
934 case USR_ASG -> append(JavaOp.lshr(lhs, rhs));
935
936
937 default -> throw unreachable();
938 };
939 return result = convert(assignOpResult, tree.type);
940 });
941 }
942 }
943
944 void applyCompoundAssign(JCTree.JCExpression lhs, Function<Value, Value> scanRhs) {
945 // Consume top node that applies to access
946 lhs = TreeInfo.skipParens(lhs);
947 switch (lhs.getTag()) {
948 case IDENT -> {
949 JCIdent assign = (JCIdent) lhs;
950
951 Symbol sym = assign.sym;
952 switch (sym.getKind()) {
953 case LOCAL_VARIABLE, PARAMETER -> { // exception parameters not valid here!
954 Value varOp = varOpValue(sym);
955
956 Op.Result lhsOpValue = append(CoreOp.varLoad(varOp));
957 // Scan the rhs
958 Value r = scanRhs.apply(lhsOpValue);
959
960 append(CoreOp.varStore(varOp, r));
961 }
962 case FIELD -> {
963 FieldRef fr = symbolToFieldRef(sym, symbolSiteType(sym));
964
965 Op.Result lhsOpValue;
966 CodeType resultType = typeToCodeType(sym.type);
967 if (sym.isStatic()) {
968 lhsOpValue = append(JavaOp.fieldLoad(resultType, fr));
969 } else {
970 lhsOpValue = append(JavaOp.fieldLoad(resultType, fr, thisValue()));
971 }
972 // Scan the rhs
973 Value r = scanRhs.apply(lhsOpValue);
974
975 if (sym.isStatic()) {
976 append(JavaOp.fieldStore(fr, r));
977 } else {
978 append(JavaOp.fieldStore(fr, thisValue(), r));
979 }
980 }
981 default -> throw unreachable();
982 }
983 }
984 case SELECT -> {
985 JCFieldAccess assign = (JCFieldAccess) lhs;
986
987 Value receiver = toValue(assign.selected);
988
989 Symbol sym = assign.sym;
990 FieldRef fr = symbolToFieldRef(sym, assign.selected.type);
991
992 Op.Result lhsOpValue;
993 CodeType resultType = typeToCodeType(sym.type);
994 if (sym.isStatic()) {
995 lhsOpValue = append(JavaOp.fieldLoad(resultType, fr));
996 } else {
997 lhsOpValue = append(JavaOp.fieldLoad(resultType, fr, receiver));
998 }
999 // Scan the rhs
1000 Value r = scanRhs.apply(lhsOpValue);
1001
1002 if (sym.isStatic()) {
1003 append(JavaOp.fieldStore(fr, r));
1004 } else {
1005 append(JavaOp.fieldStore(fr, receiver, r));
1006 }
1007 }
1008 case INDEXED -> {
1009 JCArrayAccess assign = (JCArrayAccess) lhs;
1010
1011 Value array = toValue(assign.indexed);
1012 Value index = toValue(assign.index, syms.intType);
1013
1014 Op.Result lhsOpValue = append(JavaOp.arrayLoadOp(array, index));
1015 // Scan the rhs
1016 Value r = scanRhs.apply(lhsOpValue);
1017
1018 append(JavaOp.arrayStoreOp(array, index, r));
1019 }
1020 default -> throw unreachable();
1021 }
1022 }
1023
1024 @Override
1025 public void visitIdent(JCIdent tree) {
1026 // Visited only for read access
1027
1028 Symbol sym = tree.sym;
1029 switch (sym.getKind()) {
1030 case LOCAL_VARIABLE, RESOURCE_VARIABLE, BINDING_VARIABLE, PARAMETER, EXCEPTION_PARAMETER ->
1031 result = loadVar(sym);
1032 case FIELD, ENUM_CONSTANT -> {
1033 if (sym.name.equals(names._this) || sym.name.equals(names._super)) {
1034 result = thisValue();
1035 } else if (top.localToOp.containsKey(sym)) {
1036 // if field symbol is a key in top.localToOp
1037 // we expect that we're producing the model of a lambda
1038 // we also expect that the field is a constant capture and sym was mapped to VarOp result
1039 Assert.check(isLambdaReflectable);
1040 Assert.check(sym.isStatic());
1041 Assert.check(sym.isFinal());
1042 result = loadVar(sym);
1043 } else {
1044 FieldRef fr = symbolToFieldRef(sym, symbolSiteType(sym));
1045 CodeType resultType = typeToCodeType(sym.type);
1046 if (sym.isStatic()) {
1047 result = append(JavaOp.fieldLoad(resultType, fr));
1048 } else {
1049 result = append(JavaOp.fieldLoad(resultType, fr, thisValue()));
1050 }
1051 }
1052 }
1053 case PACKAGE, INTERFACE, CLASS, ANNOTATION_TYPE, RECORD, ENUM -> {
1054 result = null;
1055 }
1056 default -> throw unreachable();
1057 }
1058 }
1059
1060 private Value loadVar(Symbol sym) {
1061 Value varOp = varOpValue(sym);
1062 Assert.check(varOp.type() instanceof VarType);
1063 return append(CoreOp.varLoad(varOp));
1064 }
1065
1066 @Override
1067 public void visitTypeIdent(JCTree.JCPrimitiveTypeTree tree) {
1068 result = null;
1069 }
1070
1071 @Override
1072 public void visitTypeArray(JCTree.JCArrayTypeTree tree) {
1073 result = null; // MyType[].class is handled in visitSelect just as MyType.class
1074 }
1075
1076 @Override
1077 public void visitSelect(JCFieldAccess tree) {
1078 // Visited only for read access
1079
1080 Type qualifierTarget = qualifierTarget(tree);
1081 // @@@: might cause redundant load if accessed symbol is static but the qualifier is not a type
1082 Value receiver = toValue(tree.selected);
1083
1084 if (tree.name.equals(names._class)) {
1085 result = append(CoreOp.constant(JavaType.J_L_CLASS, typeToCodeType(tree.selected.type)));
1086 } else if (types.isArray(tree.selected.type)) {
1087 if (tree.sym.equals(syms.lengthVar)) {
1088 result = append(JavaOp.arrayLength(receiver));
1089 } else {
1090 throw unreachable();
1091 }
1092 } else {
1093 Symbol sym = tree.sym;
1094 switch (sym.getKind()) {
1095 case FIELD, ENUM_CONSTANT -> {
1096 if (sym.name.equals(names._this) || sym.name.equals(names._super)) {
1097 result = thisValue();
1098 } else {
1099 FieldRef fr = symbolToFieldRef(sym, qualifierTarget.hasTag(NONE) ?
1100 tree.selected.type : qualifierTarget);
1101 CodeType resultType = typeToCodeType(types.memberType(tree.selected.type, sym));
1102 if (sym.isStatic()) {
1103 result = append(JavaOp.fieldLoad(resultType, fr));
1104 } else {
1105 result = append(JavaOp.fieldLoad(resultType, fr, receiver));
1106 }
1107 }
1108 }
1109 case PACKAGE, INTERFACE, CLASS, ANNOTATION_TYPE, RECORD, ENUM -> {
1110 result = null;
1111 }
1112 default -> throw unreachable();
1113 }
1114 }
1115 }
1116
1117 @Override
1118 public void visitIndexed(JCArrayAccess tree) {
1119 // Visited only for read access
1120
1121 Value array = toValue(tree.indexed);
1122
1123 Value index = toValue(tree.index, syms.intType);
1124
1125 result = append(JavaOp.arrayLoadOp(array, index));
1126 }
1127
1128 @Override
1129 public void visitApply(JCTree.JCMethodInvocation tree) {
1130 // @@@ Symbol.externalType, for use with inner classes
1131
1132 // @@@ this.xyz(...) calls in a constructor
1133
1134 JCTree meth = TreeInfo.skipParens(tree.meth);
1135 switch (meth.getTag()) {
1136 case IDENT: {
1137 JCIdent access = (JCIdent) meth;
1138
1139 Symbol sym = access.sym;
1140 List<Value> args = new ArrayList<>();
1141 JavaOp.InvokeOp.InvokeKind ik;
1142 if (!sym.isStatic()) {
1143 ik = JavaOp.InvokeOp.InvokeKind.INSTANCE;
1144 args.add(thisValue());
1145 } else {
1146 ik = JavaOp.InvokeOp.InvokeKind.STATIC;
1147 }
1148
1149 args.addAll(scanMethodArguments(tree.args, tree.meth.type, tree.varargsElement));
1150
1151 MethodRef mr = symbolToMethodRef(sym, symbolSiteType(sym));
1152 Value res = append(JavaOp.invoke(ik, tree.varargsElement != null,
1153 typeToCodeType(meth.type.getReturnType()), mr, args));
1154 if (sym.type.getReturnType().getTag() != TypeTag.VOID) {
1155 result = res;
1156 }
1157 break;
1158 }
1159 case SELECT: {
1160 JCFieldAccess access = (JCFieldAccess) meth;
1161
1162 Type qualifierTarget = qualifierTarget(access);
1163 Value receiver = toValue(access.selected, qualifierTarget);
1164
1165 Symbol sym = access.sym;
1166 List<Value> args = new ArrayList<>();
1167 JavaOp.InvokeOp.InvokeKind ik;
1168 if (!sym.isStatic()) {
1169 args.add(receiver);
1170 // @@@ expr.super(...) for inner class super constructor calls
1171 ik = switch (access.selected) {
1172 case JCIdent i when i.sym.name.equals(names._super) -> JavaOp.InvokeOp.InvokeKind.SUPER;
1173 case JCFieldAccess fa when fa.sym.name.equals(names._super) -> JavaOp.InvokeOp.InvokeKind.SUPER;
1174 default -> JavaOp.InvokeOp.InvokeKind.INSTANCE;
1175 };
1176 } else {
1177 ik = JavaOp.InvokeOp.InvokeKind.STATIC;
1178 }
1179
1180 args.addAll(scanMethodArguments(tree.args, tree.meth.type, tree.varargsElement));
1181
1182 MethodRef mr = symbolToMethodRef(sym, qualifierTarget.hasTag(NONE) ?
1183 access.selected.type : qualifierTarget);
1184 JavaType returnType = typeToCodeType(meth.type.getReturnType());
1185 JavaOp.InvokeOp iop = JavaOp.invoke(ik, tree.varargsElement != null,
1186 returnType, mr, args);
1187 Value res = append(iop);
1188 if (sym.type.getReturnType().getTag() != TypeTag.VOID) {
1189 result = res;
1190 }
1191 break;
1192 }
1193 default:
1194 throw unreachable();
1195 }
1196 }
1197
1198 List<Value> scanMethodArguments(List<JCExpression> args, Type methodType, Type varargsElement) {
1199 ListBuffer<Value> argValues = new ListBuffer<>();
1200 com.sun.tools.javac.util.List<Type> targetTypes = methodType.getParameterTypes();
1201 if (varargsElement != null) {
1202 targetTypes = targetTypes.reverse().tail;
1203 for (int i = 0 ; i < args.size() - (methodType.getParameterTypes().size() - 1) ; i++) {
1204 targetTypes = targetTypes.prepend(varargsElement);
1205 }
1206 targetTypes = targetTypes.reverse();
1207 }
1208
1209 for (JCTree.JCExpression arg : args) {
1210 argValues.add(toValue(arg, targetTypes.head));
1211 targetTypes = targetTypes.tail;
1212 }
1213 return argValues.toList();
1214 }
1215
1216 @Override
1217 public void visitReference(JCTree.JCMemberReference tree) {
1218 MemberReferenceToLambda memberReferenceToLambda = new MemberReferenceToLambda(tree, currentClassSym);
1219 JCVariableDecl recv = memberReferenceToLambda.receiverVar();
1220 if (recv != null) {
1221 scan(recv);
1222 }
1223 scan(memberReferenceToLambda.lambda());
1224 }
1225
1226 Type qualifierTarget(JCFieldAccess tree) {
1227 Type selectedType = types.skipTypeVars(tree.selected.type, true);
1228 return selectedType.isCompound() ?
1229 tree.sym.owner.type :
1230 Type.noType;
1231 }
1232
1233 @Override
1234 public void visitTypeCast(JCTree.JCTypeCast tree) {
1235 Value v = toValue(tree.expr);
1236
1237 Type expressionType = tree.expr.type;
1238 Type type = tree.type;
1239 if (expressionType.isPrimitive() && type.isPrimitive()) {
1240 if (expressionType.equals(type)) {
1241 // Redundant cast
1242 result = v;
1243 } else {
1244 result = append(JavaOp.conv(typeToCodeType(type), v));
1245 }
1246 } else if (expressionType.isPrimitive() || type.isPrimitive()) {
1247 result = convert(v, tree.type);
1248 } else if (!expressionType.hasTag(BOT) &&
1249 types.isAssignable(expressionType, type)) {
1250 // Redundant cast
1251 result = v;
1252 } else {
1253 // Reference cast
1254 JavaType jt = typeToCodeType(types.erasure(type));
1255 result = append(JavaOp.cast(typeToCodeType(type), jt, v));
1256 }
1257 }
1258
1259 @Override
1260 public void visitTypeTest(JCTree.JCInstanceOf tree) {
1261 Value target = toValue(tree.expr);
1262
1263 if (tree.pattern.getTag() != Tag.IDENT) {
1264 result = scanPattern(tree.getPattern(), target);
1265 } else {
1266 result = append(JavaOp.instanceOf(typeToCodeType(tree.pattern.type), target));
1267 }
1268 }
1269
1270 Body.Builder scanPatternAsBody(JCTree.JCPattern pattern, Value target) {
1271 pushBody(pattern, CoreType.functionType(JavaType.BOOLEAN));
1272 Value localTarget = boxIfNeeded(target);
1273 Value patVal = scanPattern(pattern, localTarget);
1274 append(CoreOp.core_yield(patVal));
1275 Body.Builder patternBody = stack.body;
1276 popBody();
1277 return patternBody;
1278 }
1279
1280 Value scanPattern(JCTree.JCPattern pattern, Value target) {
1281 // Type of pattern
1282 JavaType patternType;
1283 if (pattern instanceof JCTree.JCBindingPattern p) {
1284 patternType = JavaOp.Pattern.bindingType(typeToCodeType(p.type));
1285 } else if (pattern instanceof JCTree.JCRecordPattern p) {
1286 patternType = JavaOp.Pattern.recordType(typeToCodeType(p.record.type));
1287 } else {
1288 throw unreachable(); // toplevel patterns are type test/record
1289 }
1290
1291 // Push pattern body
1292 pushBody(pattern, CoreType.functionType(patternType));
1293
1294 // @@@ Assumes just pattern nodes, likely will change when method patterns are supported
1295 // that have expressions for any arguments (which perhaps in turn may have pattern expressions)
1296 List<JCVariableDecl> variables = new ArrayList<>();
1297 class PatternScanner extends FilterScanner {
1298
1299 private Value result;
1300
1301 public PatternScanner() {
1302 super(Set.of(Tag.BINDINGPATTERN, Tag.RECORDPATTERN, Tag.ANYPATTERN));
1303 }
1304
1305 @Override
1306 public void visitBindingPattern(JCTree.JCBindingPattern binding) {
1307 JCVariableDecl var = binding.var;
1308 variables.add(var);
1309 boolean unnamedPatternVariable = var.name.isEmpty();
1310 String bindingName = unnamedPatternVariable ? null : var.name.toString();
1311 result = append(JavaOp.typePattern(typeToCodeType(var.type), bindingName));
1312 }
1313
1314 @Override
1315 public void visitRecordPattern(JCTree.JCRecordPattern record) {
1316 // @@@ Is always Identifier to record?
1317 // scan(record.deconstructor);
1318
1319 List<Value> nestedValues = new ArrayList<>();
1320 for (JCTree.JCPattern jcPattern : record.nested) {
1321 // @@@ when we support ANYPATTERN, we must add result of toValue only if it's non-null
1322 // because passing null to recordPattern methods will cause an error
1323 nestedValues.add(toValue(jcPattern));
1324 }
1325
1326 result = append(JavaOp.recordPattern(symbolToRecordTypeRef(record.record), nestedValues));
1327 }
1328
1329 @Override
1330 public void visitAnyPattern(JCTree.JCAnyPattern anyPattern) {
1331 result = append(JavaOp.matchAllPattern());
1332 }
1333
1334 Value toValue(JCTree tree) {
1335 result = null;
1336 scan(tree);
1337 return result;
1338 }
1339 }
1340 // Scan pattern
1341 Value patternValue = new PatternScanner().toValue(pattern);
1342 append(CoreOp.core_yield(patternValue));
1343 Body.Builder patternBody = stack.body;
1344
1345 // Pop body
1346 popBody();
1347
1348 // Find nearest ancestor body stack element associated with a statement tree
1349 // @@@ Strengthen check of tree?
1350 BodyStack _variablesStack = stack;
1351 while (!(_variablesStack.tree instanceof JCTree.JCStatement)) {
1352 _variablesStack = _variablesStack.parent;
1353 }
1354 BodyStack variablesStack = _variablesStack;
1355
1356 // Create pattern var ops for pattern variables using the
1357 // builder associated with the nearest statement tree
1358 BodyStack previous = stack;
1359 // Temporarily position the stack to where the pattern variables are to be declared
1360 stack = variablesStack;
1361 try {
1362 for (JCVariableDecl jcVar : variables) {
1363 // @@@ use uninitialized variable
1364 Value defaultValue = append(defaultValue(jcVar.type));
1365 Value init = convert(defaultValue, jcVar.type);
1366 Op.Result op = append(CoreOp.var(jcVar.name.toString(), typeToCodeType(jcVar.type), init));
1367 stack.localToOp.put(jcVar.sym, op);
1368 }
1369 } finally {
1370 stack = previous;
1371 }
1372
1373 // Create pattern descriptor
1374 List<JavaType> patternDescParams = variables.stream().map(var -> typeToCodeType(var.type)).toList();
1375 FunctionType matchFuncType = CoreType.functionType(JavaType.VOID, patternDescParams);
1376
1377 // Create the match body, assigning pattern values to pattern variables
1378 Body.Builder matchBody = Body.Builder.of(patternBody.connectedAncestorBody(), matchFuncType);
1379 Block.Builder matchBuilder = matchBody.entryBlock();
1380 for (int i = 0; i < variables.size(); i++) {
1381 Value v = matchBuilder.parameters().get(i);
1382 Value var = variablesStack.localToOp.get(variables.get(i).sym);
1383 matchBuilder.add(CoreOp.varStore(var, v));
1384 }
1385 matchBuilder.add(CoreOp.core_yield());
1386
1387 // Create the match operation
1388 return append(JavaOp.match(target, patternBody, matchBody));
1389 }
1390
1391 @Override
1392 public void visitNewClass(JCTree.JCNewClass tree) {
1393 if (tree.def != null) {
1394 scan(tree.def);
1395 }
1396
1397 List<CodeType> argtypes = new ArrayList<>();
1398 Type type = tree.type;
1399 List<Value> args = new ArrayList<>();
1400 if (type.tsym.hasOuterInstance()) {
1401 // Obtain outer value for inner class, and add as first argument
1402 JCTree.JCExpression encl = tree.encl;
1403 Value outerInstance;
1404 if (encl == null) {
1405 outerInstance = thisValue();
1406 } else {
1407 outerInstance = toValue(tree.encl);
1408 }
1409 args.add(outerInstance);
1410 JavaType outerType = typeToCodeType(tree.constructor.innermostAccessibleEnclosingClass().erasure(types));
1411 argtypes.add(outerType);
1412 }
1413
1414 MethodRef methodRef = symbolToMethodRef(tree.constructor);
1415 argtypes.addAll(methodRef.signature().parameterTypes());
1416 args.addAll(scanMethodArguments(tree.args, tree.constructorType, tree.varargsElement));
1417
1418 if (tree.type.tsym.isDirectlyOrIndirectlyLocal()) {
1419 for (Symbol c : localCaptures.get(tree.type.tsym)) {
1420 args.add(loadVar(c));
1421 argtypes.add(symbolToErasedDesc(c));
1422 }
1423 }
1424
1425 // Create erased method type reference for constructor, where
1426 // the return type declares the class to instantiate
1427 // We need to manually construct the constructor reference,
1428 // as the signature of the constructor symbol is not augmented
1429 // with enclosing this and captured params.
1430 FunctionType constructorSignature = CoreType.functionType(
1431 symbolToErasedDesc(tree.constructor.owner),
1432 argtypes);
1433 MethodRef constructorRef = MethodRef.constructor(constructorSignature);
1434
1435 result = append(JavaOp.new_(tree.varargsElement != null, typeToCodeType(type), constructorRef, args));
1436 }
1437
1438 @Override
1439 public void visitNewArray(JCTree.JCNewArray tree) {
1440 if (tree.elems != null) {
1441 int length = tree.elems.size();
1442 Op.Result a = append(JavaOp.newArray(
1443 typeToCodeType(tree.type),
1444 append(CoreOp.constant(JavaType.INT, length))));
1445 int i = 0;
1446 for (JCExpression elem : tree.elems) {
1447 Value element = toValue(elem, types.elemtype(tree.type));
1448 append(JavaOp.arrayStoreOp(
1449 a,
1450 append(CoreOp.constant(JavaType.INT, i)),
1451 element));
1452 i++;
1453 }
1454
1455 result = a;
1456 } else {
1457 List<Value> indexes = new ArrayList<>();
1458 for (JCTree.JCExpression dim : tree.dims) {
1459 indexes.add(toValue(dim));
1460 }
1461
1462 JavaType arrayType = typeToCodeType(tree.type);
1463 MethodRef constructorRef = MethodRef.constructor(arrayType,
1464 indexes.stream().map(Value::type).toList());
1465 result = append(JavaOp.new_(constructorRef, indexes));
1466 }
1467 }
1468
1469 @Override
1470 public void visitLambda(JCTree.JCLambda tree) {
1471 final FunctionType lambdaType = typeToFunctionType(types.findDescriptorType(tree.target));
1472
1473 // Push quoted body
1474 // We can either be explicitly quoted or a structural quoted expression
1475 // within some larger reflected code
1476
1477 // a reflectable lambda is going to have its model wrapped in QuotedOp
1478 // only when we are producing the model of the lambda, thus the condition (isReflectable ...)
1479 // also, a lambda contained in a reflectable lambda, will not have its model wrapped in QuotedOp,
1480 // thus the condition (... body == tree)
1481 boolean toQuote = (isLambdaReflectable && this.tree == tree);
1482 if (toQuote) {
1483 pushBody(tree.body, CoreType.FUNCTION_TYPE_VOID);
1484 }
1485
1486 // Push lambda body
1487 pushBody(tree.body, lambdaType);
1488
1489 // Map lambda parameters to varOp values
1490 for (int i = 0; i < tree.params.size(); i++) {
1491 JCVariableDecl p = tree.params.get(i);
1492 Op.Result paramOp = append(CoreOp.var(
1493 p.name.toString(),
1494 stack.block.parameters().get(i)));
1495 stack.localToOp.put(p.sym, paramOp);
1496 }
1497
1498 // Scan the lambda body
1499 Type lambdaReturnType = tree.getDescriptorType(types).getReturnType();
1500 if (tree.getBodyKind() == LambdaExpressionTree.BodyKind.EXPRESSION) {
1501 Value exprVal = toValue(((JCExpression) tree.body), lambdaReturnType);
1502 if (!lambdaReturnType.hasTag(TypeTag.VOID)) {
1503 append(CoreOp.return_(exprVal));
1504 } else {
1505 appendTerminating(CoreOp::return_);
1506 }
1507 } else {
1508 Type prevBodyTarget = bodyTarget;
1509 try {
1510 bodyTarget = lambdaReturnType;
1511 toValue(((JCTree.JCStatement) tree.body));
1512 appendReturnOrUnreachable(tree.body);
1513 } finally {
1514 bodyTarget = prevBodyTarget;
1515 }
1516 }
1517
1518 // Get the functional interface type
1519 JavaType fiType = typeToCodeType(tree.target);
1520 // build functional lambda
1521 Op lambdaOp = JavaOp.lambda(fiType, stack.body, true);
1522
1523 // Pop lambda body
1524 popBody();
1525
1526 Value lambdaResult;
1527 if (toQuote) {
1528 lambdaResult = append(lambdaOp, generateLocation(tree, true));
1529 } else {
1530 lambdaResult = append(lambdaOp);
1531 }
1532
1533 if (toQuote) {
1534 append(CoreOp.core_yield(lambdaResult));
1535 CoreOp.QuotedOp quotedOp = CoreOp.quoted(stack.body);
1536
1537 // Pop quoted body
1538 popBody();
1539
1540 lambdaResult = append(quotedOp);
1541 }
1542
1543 result = lambdaResult;
1544 }
1545
1546 @Override
1547 public void visitIf(JCTree.JCIf tree) {
1548 List<Body.Builder> bodies = new ArrayList<>();
1549
1550 while (tree != null) {
1551 JCTree.JCExpression cond = TreeInfo.skipParens(tree.cond);
1552
1553 // Push if condition
1554 pushBody(cond,
1555 CoreType.functionType(JavaType.BOOLEAN));
1556 Value last = toValue(cond, syms.booleanType);
1557 // Yield the boolean result of the condition
1558 append(CoreOp.core_yield(last));
1559 bodies.add(stack.body);
1560
1561 // Pop if condition
1562 popBody();
1563
1564 // Push if body
1565 pushBody(tree.thenpart, CoreType.FUNCTION_TYPE_VOID);
1566
1567 scan(tree.thenpart);
1568 appendTerminating(CoreOp::core_yield);
1569 bodies.add(stack.body);
1570
1571 // Pop if body
1572 popBody();
1573
1574 JCTree.JCStatement elsepart = tree.elsepart;
1575 if (elsepart == null) {
1576 tree = null;
1577 } else if (elsepart.getTag() == Tag.IF) {
1578 tree = (JCTree.JCIf) elsepart;
1579 } else {
1580 // Push else body
1581 pushBody(elsepart, CoreType.FUNCTION_TYPE_VOID);
1582
1583 scan(elsepart);
1584 appendTerminating(CoreOp::core_yield);
1585 bodies.add(stack.body);
1586
1587 // Pop else body
1588 popBody();
1589
1590 tree = null;
1591 }
1592 }
1593
1594 append(JavaOp.if_(bodies));
1595 result = null;
1596 }
1597
1598 @Override
1599 public void visitSwitchExpression(JCTree.JCSwitchExpression tree) {
1600 Value target = toValue(tree.selector);
1601
1602 Type switchType = adaptBottom(tree.type);
1603 FunctionType caseBodyType = CoreType.functionType(typeToCodeType(switchType));
1604
1605 SwitchBodyInfo bodyInfo = visitSwitchStatAndExpr(tree, tree.selector, target, tree.cases, caseBodyType,
1606 !tree.hasUnconditionalPattern);
1607
1608 result = append(JavaOp.switchExpression(caseBodyType.returnType(), target, bodyInfo.handlesNull, bodyInfo.bodies));
1609 }
1610
1611 @Override
1612 public void visitSwitch(JCTree.JCSwitch tree) {
1613 Value target = toValue(tree.selector);
1614
1615 FunctionType actionType = CoreType.FUNCTION_TYPE_VOID;
1616
1617 SwitchBodyInfo bodyInfo = visitSwitchStatAndExpr(tree, tree.selector, target, tree.cases, actionType,
1618 tree.patternSwitch && !tree.hasUnconditionalPattern);
1619
1620 result = append(JavaOp.switchStatement(target, bodyInfo.handlesNull, bodyInfo.bodies));
1621 }
1622
1623 record SwitchBodyInfo(boolean handlesNull, List<Body.Builder> bodies) { }
1624
1625 private SwitchBodyInfo visitSwitchStatAndExpr(JCTree tree, JCExpression selector, Value target,
1626 List<JCTree.JCCase> cases, FunctionType caseBodyType,
1627 boolean isDefaultCaseNeeded) {
1628 List<Body.Builder> bodies = new ArrayList<>();
1629 boolean hasDefaultCase = false;
1630 boolean handlesNull = false;
1631
1632 for (JCTree.JCCase c : cases) {
1633 if (handlesNull(c)) {
1634 handlesNull = true;
1635 }
1636 if (isDefault(c)) {
1637 hasDefaultCase = true;
1638 }
1639 Body.Builder caseLabel = visitCaseLabel(tree, target, c);
1640 Body.Builder caseBody = visitCaseBody(tree, c, caseBodyType, cases.getLast() == c);
1641 bodies.add(caseLabel);
1642 bodies.add(caseBody);
1643 }
1644
1645 if (!hasDefaultCase && isDefaultCaseNeeded) {
1646 // label
1647 pushBody(tree, CoreType.functionType(JavaType.BOOLEAN));
1648 append(CoreOp.core_yield(append(CoreOp.constant(JavaType.BOOLEAN, true))));
1649 bodies.add(stack.body);
1650 popBody();
1651
1652 // body
1653 pushBody(tree, caseBodyType);
1654 append(JavaOp.throw_(
1655 append(JavaOp.new_(MethodRef.constructor(MatchException.class)))
1656 ));
1657 bodies.add(stack.body);
1658 popBody();
1659 }
1660
1661 return new SwitchBodyInfo(handlesNull, bodies);
1662 }
1663
1664 boolean handlesNull(JCTree.JCCase caseTree) {
1665 return caseTree.labels.stream().anyMatch(l -> l instanceof JCConstantCaseLabel constLabel &&
1666 TreeInfo.isNull(constLabel.expr));
1667 }
1668
1669 boolean isDefault(JCTree.JCCase caseTree) {
1670 return caseTree.labels.stream().anyMatch(l -> l instanceof JCDefaultCaseLabel);
1671 }
1672
1673 private Value processConstantLabel(Value target, JCTree.JCConstantCaseLabel label) {
1674 if (target.type().equals(JavaType.J_L_STRING)) {
1675 return append(JavaOp.invoke(
1676 MethodRef.method(Objects.class, "equals", boolean.class, Object.class, Object.class),
1677 target, toValue(label.expr)));
1678 } else {
1679 // target is primitive wrapper, primitive or enum
1680 // if target of type Character, Byte, Short or Integer, unbox it
1681 if (target.type().equals(JavaType.J_L_CHARACTER) || target.type().equals(JavaType.J_L_BYTE) ||
1682 target.type().equals(JavaType.J_L_SHORT) || target.type().equals(JavaType.J_L_INTEGER)) {
1683 PrimitiveType pt = ((ClassType) target.type()).unbox().get();
1684 target = convert(target, codeTypeToType(pt));
1685 }
1686 Value expr = toValue(label.expr);
1687 // conversion may be needed for primitive, e.g. label (byte) 1 and selector of type int
1688 expr = convert(expr, codeTypeToType(target.type()));
1689 return append(JavaOp.eq(target, expr));
1690 }
1691 }
1692
1693 private Body.Builder visitCaseLabel(JCTree tree, Value target, JCTree.JCCase c) {
1694 Body.Builder body;
1695 FunctionType caseLabelType = CoreType.functionType(JavaType.BOOLEAN, target.type());
1696
1697 JCTree.JCCaseLabel headCl = c.labels.head;
1698 if (isDefault(c)) {
1699 // @@@ Do we need to model the default label body?
1700 pushBody(headCl, CoreType.functionType(JavaType.BOOLEAN));
1701
1702 append(CoreOp.core_yield(append(CoreOp.constant(JavaType.BOOLEAN, true))));
1703 body = stack.body;
1704
1705 // Pop label
1706 popBody();
1707 } else if (headCl instanceof JCTree.JCPatternCaseLabel pcl) {
1708 boolean isMultiLabel = c.labels.size() > 1;
1709
1710 pushBody(pcl, caseLabelType);
1711
1712 Value localTarget = stack.block.parameters().get(0);
1713 final Value localResult;
1714 if (c.guard != null) {
1715 List<Body.Builder> clBodies = new ArrayList<>();
1716
1717 if (isMultiLabel) {
1718 // push a body for or-ing the patterns
1719 pushBody(pcl, CoreType.functionType(JavaType.BOOLEAN));
1720 }
1721
1722 for (JCCaseLabel l : c.labels) {
1723 JCTree.JCPatternCaseLabel pat = (JCTree.JCPatternCaseLabel)l;
1724 clBodies.add(scanPatternAsBody(pat.pat, localTarget));
1725 }
1726
1727 if (isMultiLabel) {
1728 // or the pattern bodies and replace clBodies with a single body
1729 Value patternOrResult = append(JavaOp.conditionalOr(clBodies));
1730 append(CoreOp.core_yield(patternOrResult));
1731 clBodies.clear();
1732 clBodies.add(stack.body);
1733 popBody();
1734 }
1735
1736 pushBody(c.guard, CoreType.functionType(JavaType.BOOLEAN));
1737 append(CoreOp.core_yield(toValue(c.guard, syms.booleanType)));
1738 clBodies.add(stack.body);
1739 popBody();
1740
1741 localResult = append(JavaOp.conditionalAnd(clBodies));
1742 } else if (isMultiLabel) {
1743 List<Body.Builder> clBodies = new ArrayList<>();
1744 for (JCCaseLabel l : c.labels) {
1745 JCTree.JCPatternCaseLabel pat = (JCTree.JCPatternCaseLabel)l;
1746 clBodies.add(scanPatternAsBody(pat.pat, localTarget));
1747 }
1748 localResult = append(JavaOp.conditionalOr(clBodies));
1749 } else {
1750 localTarget = boxIfNeeded(localTarget);
1751 localResult = scanPattern(pcl.pat, localTarget);
1752 }
1753 // Yield the boolean result of the condition
1754 append(CoreOp.core_yield(localResult));
1755 body = stack.body;
1756
1757 // Pop label
1758 popBody();
1759 } else if (headCl instanceof JCTree.JCConstantCaseLabel ccl) {
1760 pushBody(headCl, caseLabelType);
1761
1762 Value localTarget = stack.block.parameters().get(0);
1763 final Value localResult;
1764 if (c.labels.size() == 1) {
1765 localResult = processConstantLabel(localTarget, ccl);
1766 } else {
1767 List<Body.Builder> clBodies = new ArrayList<>();
1768 for (JCTree.JCCaseLabel cl : c.labels) {
1769 ccl = (JCTree.JCConstantCaseLabel) cl;
1770 pushBody(ccl, CoreType.functionType(JavaType.BOOLEAN));
1771
1772 final Value labelResult = processConstantLabel(localTarget, ccl);
1773
1774 append(CoreOp.core_yield(labelResult));
1775 clBodies.add(stack.body);
1776
1777 // Pop label
1778 popBody();
1779 }
1780
1781 localResult = append(JavaOp.conditionalOr(clBodies));
1782 }
1783
1784 append(CoreOp.core_yield(localResult));
1785 body = stack.body;
1786
1787 // Pop labels
1788 popBody();
1789 } else {
1790 throw unreachable();
1791 }
1792
1793 return body;
1794 }
1795
1796 private Body.Builder visitCaseBody(JCTree tree, JCTree.JCCase c, FunctionType caseBodyType, boolean isLastCase) {
1797 Body.Builder body = null;
1798 Type yieldType = tree.type != null ? adaptBottom(tree.type) : Type.noType;
1799
1800 JCTree.JCCaseLabel headCl = c.labels.head;
1801 switch (c.caseKind) {
1802 case RULE -> {
1803 pushBody(c.body, caseBodyType);
1804
1805 if (c.body instanceof JCTree.JCExpression e) {
1806 Value bodyVal = toValue(e, yieldType);
1807 append(CoreOp.core_yield(bodyVal));
1808 } else if (c.body instanceof JCTree.JCStatement s){ // this includes Block
1809 // Otherwise there is a yield statement
1810 Type prevBodyTarget = bodyTarget;
1811 try {
1812 bodyTarget = yieldType;
1813 toValue(s);
1814 } finally {
1815 bodyTarget = prevBodyTarget;
1816 }
1817 appendTerminating(c.completesNormally ? CoreOp::core_yield : CoreOp::unreachable);
1818 }
1819 body = stack.body;
1820
1821 // Pop block
1822 popBody();
1823 }
1824 case STATEMENT -> {
1825 // @@@ Avoid nesting for a single block? Goes against "say what you see"
1826 // boolean oneBlock = c.stats.size() == 1 && c.stats.head instanceof JCBlock;
1827 pushBody(c, caseBodyType);
1828
1829 scan(c.stats);
1830
1831 appendTerminating(c.completesNormally ?
1832 isLastCase ? CoreOp::core_yield : JavaOp::switchFallthroughOp
1833 : CoreOp::unreachable);
1834
1835 body = stack.body;
1836
1837 // Pop block
1838 popBody();
1839 }
1840 }
1841 return body;
1842 }
1843
1844 @Override
1845 public void visitYield(JCTree.JCYield tree) {
1846 Value retVal = toValue(tree.value, bodyTarget);
1847 result = append(JavaOp.java_yield(retVal));
1848 }
1849
1850 @Override
1851 public void visitWhileLoop(JCTree.JCWhileLoop tree) {
1852 // @@@ Patterns
1853 JCTree.JCExpression cond = TreeInfo.skipParens(tree.cond);
1854
1855 // Push while condition
1856 pushBody(cond, CoreType.functionType(JavaType.BOOLEAN));
1857 Value last = toValue(cond, syms.booleanType);
1858 // Yield the boolean result of the condition
1859 append(CoreOp.core_yield(last));
1860 Body.Builder condition = stack.body;
1861
1862 // Pop while condition
1863 popBody();
1864
1865 // Push while body
1866 pushBody(tree.body, CoreType.FUNCTION_TYPE_VOID);
1867 scan(tree.body);
1868 appendTerminating(JavaOp::continue_);
1869 Body.Builder body = stack.body;
1870
1871 // Pop while body
1872 popBody();
1873
1874 append(JavaOp.while_(condition, body));
1875 result = null;
1876 }
1877
1878 @Override
1879 public void visitDoLoop(JCTree.JCDoWhileLoop tree) {
1880 // @@@ Patterns
1881 JCTree.JCExpression cond = TreeInfo.skipParens(tree.cond);
1882
1883 // Push while body
1884 pushBody(tree.body, CoreType.FUNCTION_TYPE_VOID);
1885 scan(tree.body);
1886 appendTerminating(JavaOp::continue_);
1887 Body.Builder body = stack.body;
1888
1889 // Pop while body
1890 popBody();
1891
1892 // Push while condition
1893 pushBody(cond, CoreType.functionType(JavaType.BOOLEAN));
1894 Value last = toValue(cond, syms.booleanType);
1895 // Yield the boolean result of the condition
1896 append(CoreOp.core_yield(last));
1897 Body.Builder condition = stack.body;
1898
1899 // Pop while condition
1900 popBody();
1901
1902 append(JavaOp.doWhile(body, condition));
1903 result = null;
1904 }
1905
1906 @Override
1907 public void visitForeachLoop(JCTree.JCEnhancedForLoop tree) {
1908 // Push expression
1909 pushBody(tree.expr, CoreType.functionType(typeToCodeType(tree.expr.type)));
1910 Value last = toValue(tree.expr);
1911 // Yield the Iterable result of the expression
1912 append(CoreOp.core_yield(last));
1913 Body.Builder expression = stack.body;
1914
1915 // Pop expression
1916 popBody();
1917
1918 JCVariableDecl var = tree.getVariable();
1919 VarType varEType = CoreType.varType(typeToCodeType(var.type));
1920
1921 // Push init
1922 // @@@ When lhs assignment is a pattern we embed the pattern match into the init body and
1923 // return the bound variables
1924 Type exprType = types.cvarUpperBound(tree.expr.type);
1925 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1926 if (elemtype == null) {
1927 Type iterableType = types.asSuper(tree.expr.type, syms.iterableType.tsym);
1928 com.sun.tools.javac.util.List<Type> iterableParams = iterableType.allparams();
1929 elemtype = iterableParams.isEmpty()
1930 ? syms.objectType
1931 : types.wildUpperBound(iterableParams.head);
1932 }
1933 pushBody(var, CoreType.functionType(varEType, typeToCodeType(elemtype)));
1934 var initVarExpr = convert(stack.block.parameters().get(0), var.type);
1935 Op.Result varEResult = append(CoreOp.var(var.name.toString(), initVarExpr));
1936 append(CoreOp.core_yield(varEResult));
1937 Body.Builder init = stack.body;
1938 // Pop init
1939 popBody();
1940
1941 // Push body
1942 pushBody(tree.body, CoreType.functionType(JavaType.VOID, varEType));
1943 stack.localToOp.put(var.sym, stack.block.parameters().get(0));
1944
1945 scan(tree.body);
1946 appendTerminating(JavaOp::continue_);
1947 Body.Builder body = stack.body;
1948 // Pop body
1949 popBody();
1950
1951 append(JavaOp.enhancedFor(expression, init, body));
1952 result = null;
1953 }
1954
1955 @Override
1956 public void visitForLoop(JCTree.JCForLoop tree) {
1957 class VarDefScanner extends FilterScanner {
1958 final List<JCVariableDecl> decls;
1959
1960 public VarDefScanner() {
1961 super(Set.of(Tag.VARDEF));
1962 this.decls = new ArrayList<>();
1963 }
1964
1965 @Override
1966 public void visitVarDef(JCVariableDecl tree) {
1967 decls.add(tree);
1968 }
1969
1970 void mapVarsToBlockArguments() {
1971 for (int i = 0; i < decls.size(); i++) {
1972 stack.localToOp.put(decls.get(i).sym, stack.block.parameters().get(i));
1973 }
1974 }
1975
1976 List<VarType> varTypes() {
1977 return decls.stream()
1978 .map(t -> CoreType.varType(typeToCodeType(t.type)))
1979 .toList();
1980 }
1981
1982 List<Value> varValues() {
1983 return decls.stream()
1984 .map(t -> stack.localToOp.get(t.sym))
1985 .toList();
1986 }
1987 }
1988
1989 // Scan local variable declarations
1990 VarDefScanner vds = new VarDefScanner();
1991 vds.scan(tree.init);
1992 List<VarType> varTypes = vds.varTypes();
1993
1994 // Push init
1995 if (varTypes.size() > 1) {
1996 pushBody(null, CoreType.functionType(CoreType.tupleType(varTypes)));
1997 scan(tree.init);
1998
1999 // Capture all local variable declarations in tuple
2000 append(CoreOp.core_yield(append(CoreOp.tuple(vds.varValues()))));
2001 } else if (varTypes.size() == 1) {
2002 pushBody(null, CoreType.functionType(varTypes.get(0)));
2003 scan(tree.init);
2004
2005 append(CoreOp.core_yield(vds.varValues().get(0)));
2006 } else {
2007 pushBody(null, CoreType.FUNCTION_TYPE_VOID);
2008 scan(tree.init);
2009
2010 append(CoreOp.core_yield());
2011 }
2012 Body.Builder init = stack.body;
2013
2014 // Pop init
2015 popBody();
2016
2017 // Push cond
2018 pushBody(tree.cond, CoreType.functionType(JavaType.BOOLEAN, varTypes));
2019 if (tree.cond != null) {
2020 vds.mapVarsToBlockArguments();
2021
2022 Value last = toValue(tree.cond, syms.booleanType);
2023 // Yield the boolean result of the condition
2024 append(CoreOp.core_yield(last));
2025 } else {
2026 append(CoreOp.core_yield(append(CoreOp.constant(JavaType.BOOLEAN, true))));
2027 }
2028 Body.Builder cond = stack.body;
2029
2030 // Pop cond
2031 popBody();
2032
2033 // Push update
2034 // @@@ tree.step is a List<JCStatement>
2035 pushBody(null, CoreType.functionType(JavaType.VOID, varTypes));
2036 if (!tree.step.isEmpty()) {
2037 vds.mapVarsToBlockArguments();
2038
2039 scan(tree.step);
2040 }
2041 append(CoreOp.core_yield());
2042 Body.Builder update = stack.body;
2043
2044 // Pop update
2045 popBody();
2046
2047 // Push body
2048 pushBody(tree.body, CoreType.functionType(JavaType.VOID, varTypes));
2049 if (tree.body != null) {
2050 vds.mapVarsToBlockArguments();
2051
2052 scan(tree.body);
2053 }
2054 appendTerminating(JavaOp::continue_);
2055 Body.Builder body = stack.body;
2056
2057 // Pop update
2058 popBody();
2059
2060 append(JavaOp.for_(init, cond, update, body));
2061 result = null;
2062 }
2063
2064 @Override
2065 public void visitConditional(JCTree.JCConditional tree) {
2066 JCTree.JCExpression cond = TreeInfo.skipParens(tree.cond);
2067
2068 // Push condition
2069 pushBody(cond,
2070 CoreType.functionType(JavaType.BOOLEAN));
2071 Value condVal = toValue(cond, syms.booleanType);
2072 // Yield the boolean result of the condition
2073 append(CoreOp.core_yield(condVal));
2074 Body.Builder predicateBody = stack.body;
2075
2076 // Pop condition
2077 popBody();
2078
2079 JCTree.JCExpression truepart = TreeInfo.skipParens(tree.truepart);
2080
2081 Type condType = adaptBottom(tree.type);
2082
2083 // Push true body
2084 pushBody(truepart,
2085 CoreType.functionType(typeToCodeType(condType)));
2086
2087 Value trueVal = toValue(truepart, condType);
2088 // Yield the result
2089 append(CoreOp.core_yield(trueVal));
2090 Body.Builder trueBody = stack.body;
2091
2092 // Pop true body
2093 popBody();
2094
2095 JCTree.JCExpression falsepart = TreeInfo.skipParens(tree.falsepart);
2096
2097 // Push false body
2098 pushBody(falsepart,
2099 CoreType.functionType(typeToCodeType(condType)));
2100
2101 Value falseVal = toValue(falsepart, condType);
2102 // Yield the result
2103 append(CoreOp.core_yield(falseVal));
2104 Body.Builder falseBody = stack.body;
2105
2106 // Pop false body
2107 popBody();
2108
2109 result = append(JavaOp.conditionalExpression(typeToCodeType(condType), predicateBody, trueBody, falseBody));
2110 }
2111
2112 private Type condType(JCExpression tree, Type type) {
2113 if (type.hasTag(BOT)) {
2114 return adaptBottom(tree.type);
2115 } else {
2116 return type;
2117 }
2118 }
2119
2120 private Type adaptBottom(Type type) {
2121 return type.hasTag(BOT) ?
2122 (pt.hasTag(NONE) ? syms.objectType : pt) :
2123 type;
2124 }
2125
2126 @Override
2127 public void visitAssert(JCAssert tree) {
2128 // assert <cond:body1> [detail:body2]
2129
2130 List<Body.Builder> bodies = new ArrayList<>();
2131 JCTree.JCExpression cond = TreeInfo.skipParens(tree.cond);
2132
2133 // Push condition
2134 pushBody(cond,
2135 CoreType.functionType(JavaType.BOOLEAN));
2136 Value condVal = toValue(cond, syms.booleanType);
2137
2138 // Yield the boolean result of the condition
2139 append(CoreOp.core_yield(condVal));
2140 bodies.add(stack.body);
2141
2142 // Pop condition
2143 popBody();
2144
2145 if (tree.detail != null) {
2146 JCTree.JCExpression detail = TreeInfo.skipParens(tree.detail);
2147
2148 pushBody(detail,
2149 CoreType.functionType(typeToCodeType(tree.detail.type)));
2150 Value detailVal = toValue(detail);
2151
2152 append(CoreOp.core_yield(detailVal));
2153 bodies.add(stack.body);
2154
2155 //Pop detail
2156 popBody();
2157 }
2158
2159 result = append(JavaOp.assert_(bodies));
2160
2161 }
2162
2163 @Override
2164 public void visitBlock(JCTree.JCBlock tree) {
2165 if (stack.tree == tree) {
2166 // Block is associated with the visit of a parent structure
2167 scan(tree.stats);
2168 } else {
2169 // Otherwise, independent block structure
2170 // Push block
2171 pushBody(tree, CoreType.FUNCTION_TYPE_VOID);
2172 scan(tree.stats);
2173 appendTerminating(CoreOp::core_yield);
2174 Body.Builder body = stack.body;
2175
2176 // Pop block
2177 popBody();
2178
2179 append(JavaOp.block(body));
2180 }
2181 result = null;
2182 }
2183
2184 @Override
2185 public void visitSynchronized(JCTree.JCSynchronized tree) {
2186 // Push expr
2187 pushBody(tree.lock, CoreType.functionType(typeToCodeType(tree.lock.type)));
2188 Value last = toValue(tree.lock);
2189 append(CoreOp.core_yield(last));
2190 Body.Builder expr = stack.body;
2191
2192 // Pop expr
2193 popBody();
2194
2195 // Push body block
2196 pushBody(tree.body, CoreType.FUNCTION_TYPE_VOID);
2197 // Scan body block statements
2198 scan(tree.body.stats);
2199 appendTerminating(CoreOp::core_yield);
2200 Body.Builder blockBody = stack.body;
2201
2202 // Pop body block
2203 popBody();
2204
2205 append(JavaOp.synchronized_(expr, blockBody));
2206 }
2207
2208 @Override
2209 public void visitLabelled(JCTree.JCLabeledStatement tree) {
2210 // Push block
2211 pushBody(tree, CoreType.FUNCTION_TYPE_VOID);
2212 // Create constant for label
2213 String labelName = tree.label.toString();
2214 Op.Result label = append(CoreOp.constant(JavaType.J_L_STRING, labelName));
2215 // Set label on body stack
2216 stack.setLabel(labelName, label);
2217 scan(tree.body);
2218 appendTerminating(CoreOp::core_yield);
2219 Body.Builder body = stack.body;
2220
2221 // Pop block
2222 popBody();
2223
2224 result = append(JavaOp.labeled(body));
2225 }
2226
2227 @Override
2228 public void visitTry(JCTree.JCTry tree) {
2229 List<Symbol> rVariableDecls = new ArrayList<>();
2230 List<CodeType> rTypes = new ArrayList<>();
2231 List<Body.Builder> resources = new ArrayList<>();
2232 if (!tree.resources.isEmpty()) {
2233 // Resources bodies return the resource variables/values in order of declaration
2234 for (JCTree resource : tree.resources) {
2235 CodeType rType;
2236 if (resource instanceof JCVariableDecl vdecl) {
2237 rType = CoreType.varType(typeToCodeType(vdecl.type));
2238 } else {
2239 rType = typeToCodeType(resource.type);
2240 }
2241
2242 // Push resources body
2243 pushBody(null, CoreType.functionType(rType, rTypes));
2244 for (int i = 0; i < rVariableDecls.size(); i++) {
2245 Symbol rVariableDecl = rVariableDecls.get(i);
2246 if (rVariableDecl != null) {
2247 stack.localToOp.put(rVariableDecl, stack.block.parameters().get(i));
2248 }
2249 }
2250
2251 if (resource instanceof JCTree.JCExpression e) {
2252 append(CoreOp.core_yield(toValue(e)));
2253 } else if (resource instanceof JCTree.JCStatement s) {
2254 append(CoreOp.core_yield(toValue(s)));
2255 }
2256
2257 resources.add(stack.body);
2258
2259 // Pop resources body
2260 popBody();
2261
2262 // Null entries preserve positions for resource expressions, which have no variable declaration.
2263 rVariableDecls.add(resource instanceof JCVariableDecl vdecl ? vdecl.sym : null);
2264 rTypes.add(rType);
2265 }
2266 }
2267
2268 // Push body
2269 // Try body accepts the resource variables (in order of declaration).
2270 pushBody(tree.body, CoreType.functionType(JavaType.VOID, rTypes));
2271 for (int i = 0; i < rVariableDecls.size(); i++) {
2272 stack.localToOp.put(rVariableDecls.get(i), stack.block.parameters().get(i));
2273 }
2274 scan(tree.body);
2275 appendTerminating(CoreOp::core_yield);
2276 Body.Builder body = stack.body;
2277
2278 // Pop block
2279 popBody();
2280
2281 List<CodeType> catchTypes = new ArrayList<>();
2282 List<Body.Builder> catchers = new ArrayList<>();
2283 for (JCTree.JCCatch catcher : tree.catchers) {
2284
2285 catchTypes.add(TreeInfo.isMultiCatch(catcher)
2286 ? CoreType.tupleType(((JCTree.JCTypeUnion) catcher.param.vartype).alternatives.stream()
2287 .map(a -> typeToCodeType(a.type)).toList())
2288 : typeToCodeType(catcher.param.vartype.type));
2289
2290 // Push body
2291 pushBody(catcher.body, CoreType.functionType(JavaType.VOID, typeToCodeType(catcher.param.type)));
2292 Op.Result exVariable = append(CoreOp.var(
2293 catcher.param.name.toString(),
2294 stack.block.parameters().get(0)));
2295 stack.localToOp.put(catcher.param.sym, exVariable);
2296 scan(catcher.body);
2297 appendTerminating(CoreOp::core_yield);
2298 catchers.add(stack.body);
2299
2300 // Pop block
2301 popBody();
2302 }
2303
2304 Body.Builder finalizer;
2305 if (tree.finalizer != null) {
2306 // Push body
2307 pushBody(tree.finalizer, CoreType.FUNCTION_TYPE_VOID);
2308 scan(tree.finalizer);
2309 appendTerminating(CoreOp::core_yield);
2310 finalizer = stack.body;
2311
2312 // Pop block
2313 popBody();
2314 }
2315 else {
2316 finalizer = null;
2317 }
2318
2319 result = append(JavaOp.try_(resources, body, catchTypes, catchers, finalizer));
2320 }
2321
2322 @Override
2323 public void visitUnary(JCTree.JCUnary tree) {
2324 Tag tag = tree.getTag();
2325 switch (tag) {
2326 case POSTINC, POSTDEC, PREINC, PREDEC -> {
2327 // Capture applying rhs and operation
2328 Function<Value, Value> scanRhs = (lhs) -> {
2329 // arithmetic operators are all of kind (T, T)T
2330 Type opType = tree.operator.type.getReturnType();
2331 if (!opType.hasTag(INT) &&
2332 opType.getTag().isSubRangeOf(INT)) {
2333 // unary ++/-- can use sub-int operator types,
2334 // which doesn't make sense for the model
2335 opType = syms.intType;
2336 }
2337
2338 // We first convert LHS, then process RHS
2339 // While JLS doesn't require this, javac generates bytecode this way
2340 Value lhsConv = convert(lhs, opType);
2341 Value one = append(numericOneValue(opType));
2342
2343 Value lhsPlusOne = (tag == Tag.PREINC || tag == Tag.POSTINC) ?
2344 append(JavaOp.add(lhsConv, one)) :
2345 append(JavaOp.sub(lhsConv, one));
2346 lhsPlusOne = convert(lhsPlusOne, tree.type);
2347
2348 // Assign expression result
2349 result = (tag == Tag.POSTINC || tag == Tag.POSTDEC) ?
2350 lhs : lhsPlusOne;
2351 return lhsPlusOne;
2352 };
2353
2354 applyCompoundAssign(tree.arg, scanRhs);
2355 }
2356 case NEG -> {
2357 Value rhs = toValue(tree.arg, tree.type);
2358 result = append(JavaOp.neg(rhs));
2359 }
2360 case NOT -> {
2361 Value rhs = toValue(tree.arg, tree.type);
2362 result = append(JavaOp.not(rhs));
2363 }
2364 case COMPL -> {
2365 Value rhs = toValue(tree.arg, tree.type);
2366 result = append(JavaOp.compl(rhs));
2367 }
2368 case POS -> {
2369 // Result is value of the operand
2370 result = toValue(tree.arg, tree.type);
2371 }
2372 default -> throw unreachable(); // NULLCHK not possible
2373 }
2374 }
2375
2376 @Override
2377 public void visitBinary(JCBinary tree) {
2378 Tag tag = tree.getTag();
2379 if (tag == Tag.AND || tag == Tag.OR) {
2380 // Logical operations
2381 // @@@ Flatten nested sequences
2382
2383 // Push lhs
2384 pushBody(tree.lhs, CoreType.functionType(JavaType.BOOLEAN));
2385 Value lhs = toValue(tree.lhs, syms.booleanType);
2386 // Yield the boolean result of the condition
2387 append(CoreOp.core_yield(lhs));
2388 Body.Builder bodyLhs = stack.body;
2389
2390 // Pop lhs
2391 popBody();
2392
2393 // Push rhs
2394 pushBody(tree.rhs, CoreType.functionType(JavaType.BOOLEAN));
2395 Value rhs = toValue(tree.rhs, syms.booleanType);
2396 // Yield the boolean result of the condition
2397 append(CoreOp.core_yield(rhs));
2398 Body.Builder bodyRhs = stack.body;
2399
2400 // Pop lhs
2401 popBody();
2402
2403 List<Body.Builder> bodies = List.of(bodyLhs, bodyRhs);
2404 result = append(tag == Tag.AND
2405 ? JavaOp.conditionalAnd(bodies)
2406 : JavaOp.conditionalOr(bodies));
2407 } else if (tag == Tag.PLUS && tree.operator.opcode == ByteCodes.string_add) {
2408 //Ignore the operator and query both subexpressions for their type with concats
2409 Type lhsType = tree.lhs.type;
2410 Type rhsType = tree.rhs.type;
2411
2412 Value lhs = toValue(tree.lhs, lhsType.hasTag(BOT) ? syms.stringType : lhsType);
2413 Value rhs = toValue(tree.rhs, rhsType.hasTag(BOT) ? syms.stringType : rhsType);
2414
2415 result = append(JavaOp.concat(lhs, rhs));
2416 }
2417 else {
2418 Type lhsType = tree.operator.type.getParameterTypes().head;
2419 Type rhsType = tree.operator.type.getParameterTypes().tail.head;
2420 Value lhs = toValue(tree.lhs, lhsType);
2421 Value rhs = toValue(tree.rhs, rhsType);
2422
2423 result = switch (tag) {
2424 // Arithmetic operations
2425 case PLUS -> append(JavaOp.add(lhs, rhs));
2426 case MINUS -> append(JavaOp.sub(lhs, rhs));
2427 case MUL -> append(JavaOp.mul(lhs, rhs));
2428 case DIV -> append(JavaOp.div(lhs, rhs));
2429 case MOD -> append(JavaOp.mod(lhs, rhs));
2430
2431 // Test operations
2432 case EQ -> append(JavaOp.eq(lhs, rhs));
2433 case NE -> append(JavaOp.neq(lhs, rhs));
2434 //
2435 case LT -> append(JavaOp.lt(lhs, rhs));
2436 case LE -> append(JavaOp.le(lhs, rhs));
2437 case GT -> append(JavaOp.gt(lhs, rhs));
2438 case GE -> append(JavaOp.ge(lhs, rhs));
2439
2440 // Bitwise operations (including their boolean variants)
2441 case BITOR -> append(JavaOp.or(lhs, rhs));
2442 case BITAND -> append(JavaOp.and(lhs, rhs));
2443 case BITXOR -> append(JavaOp.xor(lhs, rhs));
2444
2445 // Shift operations
2446 case SL -> append(JavaOp.lshl(lhs, rhs));
2447 case SR -> append(JavaOp.ashr(lhs, rhs));
2448 case USR -> append(JavaOp.lshr(lhs, rhs));
2449
2450 default -> throw unreachable();
2451 };
2452 }
2453 }
2454
2455 @Override
2456 public void visitLiteral(JCLiteral tree) {
2457 Object value = switch (tree.type.getTag()) {
2458 case BOOLEAN -> tree.value instanceof Integer i && i == 1;
2459 case CHAR -> (char) (int) tree.value;
2460 default -> tree.value;
2461 };
2462 Type constantType = adaptBottom(tree.type);
2463 result = append(CoreOp.constant(typeToCodeType(constantType), value));
2464 }
2465
2466 @Override
2467 public void visitReturn(JCReturn tree) {
2468 Value retVal = toValue(tree.expr, bodyTarget);
2469 if (retVal == null) {
2470 result = append(CoreOp.return_());
2471 } else {
2472 result = append(CoreOp.return_(retVal));
2473 }
2474 }
2475
2476 @Override
2477 public void visitThrow(JCTree.JCThrow tree) {
2478 Value throwVal = toValue(tree.expr);
2479 result = append(JavaOp.throw_(throwVal));
2480 }
2481
2482 @Override
2483 public void visitBreak(JCTree.JCBreak tree) {
2484 Value label = tree.label != null
2485 ? getLabel(tree.label.toString())
2486 : null;
2487 result = append(JavaOp.break_(label));
2488 }
2489
2490 @Override
2491 public void visitContinue(JCTree.JCContinue tree) {
2492 Value label = tree.label != null
2493 ? getLabel(tree.label.toString())
2494 : null;
2495 result = append(JavaOp.continue_(label));
2496 }
2497
2498 @Override
2499 public void visitClassDef(JCClassDecl tree) {
2500 computeCapturesIfNeeded(tree);
2501 }
2502
2503 AssertionError unreachable() {
2504 return new AssertionError("Should not reach here!");
2505 }
2506
2507 CoreOp.FuncOp scanMethod(JCBlock body) {
2508 scan(body, ReflectMethods.this.currentNode());
2509 appendReturnOrUnreachable(body);
2510 CoreOp.FuncOp func = CoreOp.func(name.toString(), stack.body);
2511 func.setLocation(generateLocation(tree, true));
2512 return func;
2513 }
2514
2515 CoreOp.FuncOp scanMethod() {
2516 return scanMethod(((JCMethodDecl)tree).body);
2517 }
2518
2519 CoreOp.FuncOp scanLambda() {
2520 scan(tree, ReflectMethods.this.prevNode());
2521 // Return the quoted result
2522 append(CoreOp.return_(result));
2523 return CoreOp.func(name.toString(), stack.body);
2524 }
2525
2526 Op defaultValue(Type t) {
2527 return switch (t.getTag()) {
2528 case BYTE, SHORT, INT -> CoreOp.constant(JavaType.INT, 0);
2529 case CHAR -> CoreOp.constant(typeToCodeType(t), (char)0);
2530 case BOOLEAN -> CoreOp.constant(typeToCodeType(t), false);
2531 case FLOAT -> CoreOp.constant(typeToCodeType(t), 0f);
2532 case LONG -> CoreOp.constant(typeToCodeType(t), 0L);
2533 case DOUBLE -> CoreOp.constant(typeToCodeType(t), 0d);
2534 default -> CoreOp.constant(typeToCodeType(t), null);
2535 };
2536 }
2537
2538 Op numericOneValue(Type t) {
2539 return switch (t.getTag()) {
2540 case BYTE, SHORT, INT -> CoreOp.constant(JavaType.INT, 1);
2541 case CHAR -> CoreOp.constant(typeToCodeType(t), (char)1);
2542 case FLOAT -> CoreOp.constant(typeToCodeType(t), 1f);
2543 case LONG -> CoreOp.constant(typeToCodeType(t), 1L);
2544 case DOUBLE -> CoreOp.constant(typeToCodeType(t), 1d);
2545 default -> throw new UnsupportedOperationException(t.toString());
2546 };
2547 }
2548 }
2549
2550 boolean isReflectable(JCMethodDecl tree) {
2551 return codeReflectionEnabled ||
2552 (tree.body != null &&
2553 (reflectAll || tree.sym.attribute(crSyms.codeReflectionType.tsym) != null));
2554 }
2555
2556 boolean isReflectable(JCFunctionalExpression expr) {
2557 return reflectAll || codeReflectionEnabled ||
2558 (prevNode() instanceof JCTypeCast castTree && isReflectable(castTree.clazz.type));
2559 }
2560
2561 boolean isReflectable(Type target) {
2562 if (target.isCompound()) {
2563 return ((IntersectionClassType)target).getComponents().stream()
2564 .anyMatch(this::isReflectable);
2565 } else {
2566 return target.getAnnotationMirrors().stream()
2567 .anyMatch(tc -> tc.type.tsym == crSyms.codeReflectionType.tsym);
2568 }
2569 }
2570
2571 /*
2572 * Converts a method reference which cannot be used directly into a lambda.
2573 * This code has been derived from LambdaToMethod::MemberReferenceToLambda. The main
2574 * difference is that, while that code concerns with translation strategy, boxing
2575 * conversion and type erasure, this version does not and, as such, can remain
2576 * at a higher level. Note that this code needs to create a synthetic variable
2577 * declaration in case of a bounded method reference whose receiver expression
2578 * is other than 'this'/'super' (this is done to prevent the receiver expression
2579 * from being computed twice).
2580 */
2581 private class MemberReferenceToLambda {
2582
2583 private final JCMemberReference tree;
2584 private final Symbol owner;
2585 private final ListBuffer<JCExpression> args = new ListBuffer<>();
2586 private final ListBuffer<JCVariableDecl> params = new ListBuffer<>();
2587 private JCVariableDecl receiverVar = null;
2588
2589 MemberReferenceToLambda(JCMemberReference tree, Symbol currentClass) {
2590 this.tree = tree;
2591 this.owner = new MethodSymbol(0, names.lambda, tree.target, currentClass);
2592 if (tree.kind == ReferenceKind.BOUND && !TreeInfo.isThisQualifier(tree.getQualifierExpression())) {
2593 // true bound method reference, hoist receiver expression out
2594 Type recvType = types.asSuper(tree.getQualifierExpression().type, tree.sym.owner);
2595 VarSymbol vsym = makeSyntheticVar("rec$", recvType);
2596 receiverVar = make.VarDef(vsym, tree.getQualifierExpression());
2597 }
2598 }
2599
2600 JCVariableDecl receiverVar() {
2601 return receiverVar;
2602 }
2603
2604 JCLambda lambda() {
2605 int prevPos = make.pos;
2606 try {
2607 make.at(tree);
2608
2609 //body generation - this can be either a method call or a
2610 //new instance creation expression, depending on the member reference kind
2611 VarSymbol rcvr = addParametersReturnReceiver();
2612 JCExpression expr = (tree.getMode() == ReferenceMode.INVOKE)
2613 ? expressionInvoke(rcvr)
2614 : expressionNew();
2615
2616 JCLambda slam = make.Lambda(params.toList(), expr);
2617 slam.target = tree.target;
2618 slam.type = tree.type;
2619 slam.pos = tree.pos;
2620 return slam;
2621 } finally {
2622 make.at(prevPos);
2623 }
2624 }
2625
2626 /**
2627 * Generate the parameter list for the converted member reference.
2628 *
2629 * @return The receiver variable symbol, if any
2630 */
2631 VarSymbol addParametersReturnReceiver() {
2632 com.sun.tools.javac.util.List<Type> descPTypes = tree.getDescriptorType(types).getParameterTypes();
2633 VarSymbol receiverParam = null;
2634 switch (tree.kind) {
2635 case BOUND:
2636 if (receiverVar != null) {
2637 receiverParam = receiverVar.sym;
2638 }
2639 break;
2640 case UNBOUND:
2641 // The receiver is the first parameter, extract it and
2642 // adjust the SAM and unerased type lists accordingly
2643 receiverParam = addParameter("rec$", descPTypes.head, false);
2644 descPTypes = descPTypes.tail;
2645 break;
2646 }
2647 for (int i = 0; descPTypes.nonEmpty(); ++i) {
2648 // By default use the implementation method parameter type
2649 Type parmType = descPTypes.head;
2650 addParameter("x$" + i, parmType, true);
2651
2652 // Advance to the next parameter
2653 descPTypes = descPTypes.tail;
2654 }
2655
2656 return receiverParam;
2657 }
2658
2659 /**
2660 * determine the receiver of the method call - the receiver can
2661 * be a type qualifier, the synthetic receiver parameter or 'super'.
2662 */
2663 private JCExpression expressionInvoke(VarSymbol receiverParam) {
2664 JCExpression qualifier = receiverParam != null ?
2665 make.at(tree.pos).Ident(receiverParam) :
2666 tree.getQualifierExpression();
2667
2668 //create the qualifier expression
2669 JCFieldAccess select = make.Select(qualifier, tree.sym.name);
2670 select.sym = tree.sym;
2671 select.type = tree.referentType;
2672
2673 //create the method call expression
2674 JCMethodInvocation apply = make.Apply(com.sun.tools.javac.util.List.nil(), select, args.toList()).
2675 setType(tree.referentType.getReturnType());
2676
2677 apply.varargsElement = tree.varargsElement;
2678 return apply;
2679 }
2680
2681 /**
2682 * Lambda body to use for a 'new'.
2683 */
2684 private JCExpression expressionNew() {
2685 Type expectedType = tree.referentType.getReturnType().hasTag(TypeTag.VOID) ?
2686 tree.expr.type : tree.referentType.getReturnType();
2687 if (tree.kind == ReferenceKind.ARRAY_CTOR) {
2688 //create the array creation expression
2689 JCNewArray newArr = make.NewArray(
2690 make.Type(types.elemtype(expectedType)),
2691 com.sun.tools.javac.util.List.of(make.Ident(params.first())),
2692 null);
2693 newArr.type = tree.getQualifierExpression().type;
2694 return newArr;
2695 } else {
2696 //create the instance creation expression
2697 //note that method reference syntax does not allow an explicit
2698 //enclosing class (so the enclosing class is null)
2699 // but this may need to be patched up later with the proxy for the outer this
2700 JCExpression newType = make.Type(types.erasure(expectedType));
2701 if (expectedType.tsym.type.getTypeArguments().nonEmpty()) {
2702 newType = make.TypeApply(newType, com.sun.tools.javac.util.List.nil());
2703 }
2704 JCNewClass newClass = make.NewClass(null,
2705 com.sun.tools.javac.util.List.nil(),
2706 newType,
2707 args.toList(),
2708 null);
2709 newClass.constructor = tree.sym;
2710 newClass.constructorType = tree.referentType;
2711 newClass.type = expectedType;
2712 newClass.varargsElement = tree.varargsElement;
2713 return newClass;
2714 }
2715 }
2716
2717 private VarSymbol makeSyntheticVar(String name, Type type) {
2718 VarSymbol vsym = new VarSymbol(PARAMETER | SYNTHETIC, names.fromString(name), type, owner);
2719 vsym.pos = tree.pos;
2720 return vsym;
2721 }
2722
2723 private VarSymbol addParameter(String name, Type type, boolean genArg) {
2724 VarSymbol vsym = makeSyntheticVar(name, type);
2725 params.append(make.VarDef(vsym, null));
2726 if (genArg) {
2727 args.append(make.Ident(vsym));
2728 }
2729 return vsym;
2730 }
2731 }
2732
2733 static class JCReflectMethodsClassDecl extends JCClassDecl {
2734
2735 SequencedMap<String, Op> ops;
2736
2737 JCReflectMethodsClassDecl(JCClassDecl cls, SequencedMap<String, Op> ops) {
2738 super(cls.mods, cls.name, cls.typarams, cls.extending, cls.implementing, cls.permitting, cls.defs, cls.sym);
2739 this.pos = cls.pos;
2740 this.type = cls.type;
2741 this.ops = ops;
2742 }
2743 }
2744
2745 public static class Provider implements CodeReflectionTransformer {
2746 @Override
2747 public JCTree translateTopLevelClass(Context context, JCTree tree, TreeMaker make) {
2748 return ReflectMethods.instance(context).translateTopLevelClass(tree, make);
2749 }
2750
2751 @Override
2752 public void genCode(Context context, JCClassDecl cdef) throws IOException {
2753 if (cdef instanceof JCReflectMethodsClassDecl rmcdef) {
2754 JavaFileManager fileManager = context.get(JavaFileManager.class);
2755 JavaFileManager.Location outLocn;
2756 if (fileManager.hasLocation(StandardLocation.MODULE_SOURCE_PATH)) {
2757 outLocn = fileManager.getLocationForModule(StandardLocation.CLASS_OUTPUT, cdef.sym.packge().modle.name.toString());
2758 } else {
2759 outLocn = StandardLocation.CLASS_OUTPUT;
2760 }
2761 String className = cdef.sym.flatName().toString() + "$$CM";
2762 ClassDesc classDesc = ClassDesc.of(className);
2763 JavaFileObject outFile = fileManager.getJavaFileForOutput(outLocn, className, JavaFileObject.Kind.CLASS, cdef.sym.sourcefile);
2764 ClassDesc hostClass = ClassDesc.of(cdef.sym.flatName().toString());
2765
2766 CoreOp.ModuleOp module = OpBuilder.createBuilderFunctions(
2767 rmcdef.ops,
2768 b -> b.add(JavaOp.fieldLoad(
2769 FieldRef.field(JavaOp.class, "JAVA_DIALECT_FACTORY", DialectFactory.class))));
2770 byte[] data = BytecodeGenerator.generateClassData(MethodHandles.lookup(), classDesc, module);
2771 // inject InnerClassesAttribute and NestHostAttribute
2772 var clm = ClassFile.of().parse(data);
2773 data = ClassFile.of().transformClass(clm, ClassTransform.endHandler(clb ->
2774 clb.with(InnerClassesAttribute.of(InnerClassInfo.of(classDesc, Optional.of(hostClass), Optional.of("$CM"), ClassFile.ACC_STATIC)))
2775 .with(NestHostAttribute.of(hostClass))));
2776 try (OutputStream out = outFile.openOutputStream()) {
2777 out.write(data);
2778 }
2779 }
2780 }
2781 }
2782
2783 // type and ref conversion utils
2784
2785 JavaType symbolToErasedDesc(Symbol s) {
2786 return typeToCodeType(s.erasure(types));
2787 }
2788
2789 JavaType typeToCodeType(Type t) {
2790 Assert.check(!t.hasTag(METHOD));
2791 t = asDenotable(t);
2792 return switch (t.getTag()) {
2793 case VOID -> JavaType.VOID;
2794 case CHAR -> JavaType.CHAR;
2795 case BOOLEAN -> JavaType.BOOLEAN;
2796 case BYTE -> JavaType.BYTE;
2797 case SHORT -> JavaType.SHORT;
2798 case INT -> JavaType.INT;
2799 case FLOAT -> JavaType.FLOAT;
2800 case LONG -> JavaType.LONG;
2801 case DOUBLE -> JavaType.DOUBLE;
2802 case ARRAY -> {
2803 Type et = ((ArrayType)t).elemtype;
2804 yield JavaType.array(typeToCodeType(et));
2805 }
2806 case WILDCARD -> {
2807 Type.WildcardType wt = (Type.WildcardType)t;
2808 yield wt.isUnbound() ?
2809 JavaType.wildcard() :
2810 JavaType.wildcard(wt.isExtendsBound() ? BoundKind.EXTENDS : BoundKind.SUPER, typeToCodeType(wt.type));
2811 }
2812 case TYPEVAR -> {
2813 Type ub = t.getUpperBound();
2814 if (ub.contains(t)) {
2815 // @@@ stop infinite recursion, ex: <E extends Enum<E>>
2816 ub = types.erasure(ub);
2817 }
2818 yield t.tsym.owner.kind == Kind.MTH ?
2819 JavaType.typeVar(t.tsym.name.toString(), symbolToMethodRef(t.tsym.owner),
2820 typeToCodeType(ub)) :
2821 JavaType.typeVar(t.tsym.name.toString(),
2822 (jdk.incubator.code.dialect.java.ClassType)symbolToErasedDesc(t.tsym.owner),
2823 typeToCodeType(ub));
2824 }
2825 case CLASS -> {
2826 Assert.check(!t.isIntersection() && !t.isUnion());
2827 JavaType typ;
2828 if (t.getEnclosingType() != Type.noType) {
2829 Name innerName = t.tsym.flatName().subName(t.getEnclosingType().tsym.flatName().length() + 1);
2830 typ = JavaType.qualified(typeToCodeType(t.getEnclosingType()), innerName.toString());
2831 } else {
2832 typ = JavaType.type(ClassDesc.of(t.tsym.flatName().toString()));
2833 }
2834
2835 List<JavaType> typeArguments;
2836 if (t.getTypeArguments().nonEmpty()) {
2837 typeArguments = new ArrayList<>();
2838 for (Type ta : t.getTypeArguments()) {
2839 typeArguments.add(typeToCodeType(ta));
2840 }
2841 } else {
2842 typeArguments = List.of();
2843 }
2844
2845 // Use flat name to ensure demarcation of nested classes
2846 yield JavaType.parameterized(typ, typeArguments);
2847 }
2848 default -> throw new UnsupportedOperationException("Unsupported type: kind=" + t.getKind() + " type=" + t);
2849 };
2850 }
2851
2852 Type codeTypeToType(CodeType jt) {
2853 return switch (jt) {
2854 case PrimitiveType pt when pt == JavaType.BOOLEAN -> syms.booleanType;
2855 case PrimitiveType pt when pt == JavaType.CHAR -> syms.charType;
2856 case PrimitiveType pt when pt == JavaType.BYTE -> syms.byteType;
2857 case PrimitiveType pt when pt == JavaType.SHORT -> syms.shortType;
2858 case PrimitiveType pt when pt == JavaType.INT -> syms.intType;
2859 case PrimitiveType pt when pt == JavaType.LONG -> syms.longType;
2860 case PrimitiveType pt when pt == JavaType.FLOAT -> syms.floatType;
2861 case PrimitiveType pt when pt == JavaType.DOUBLE -> syms.doubleType;
2862 case ClassType ct when ct.hasTypeArguments() -> {
2863 Type enclosing = ct.enclosingType().map(this::codeTypeToType).orElse(Type.noType);
2864 com.sun.tools.javac.util.List<Type> typeArgs = com.sun.tools.javac.util.List.from(ct.typeArguments()).map(this::codeTypeToType);
2865 yield new Type.ClassType(enclosing, typeArgs, codeTypeToType(ct.rawType()).tsym);
2866 }
2867 case ClassType ct -> types.erasure(syms.enterClass(attrEnv().toplevel.modle, names.fromString(ct.toClassName())).type);
2868 case jdk.incubator.code.dialect.java.ArrayType at -> new Type.ArrayType(codeTypeToType(at.componentType()), syms.arrayClass);
2869 default -> Type.noType;
2870 };
2871 }
2872
2873 Type symbolSiteType(Symbol s) {
2874 boolean isMember = s.owner == syms.predefClass ||
2875 s.isMemberOf(currentClassSym, types);
2876 return isMember ? currentClassSym.type : s.owner.type;
2877 }
2878
2879 FieldRef symbolToFieldRef(Symbol s, Type site) {
2880 // @@@ Made Gen::binaryQualifier public, duplicate logic?
2881 // Ensure correct qualifying class is used in the reference, see JLS 13.1
2882 // https://docs.oracle.com/javase/specs/jls/se20/html/jls-13.html#jls-13.1
2883 return symbolFieldRef(gen.binaryQualifier(s, types.erasure(site)));
2884 }
2885
2886 FieldRef symbolFieldRef(Symbol s) {
2887 Type erasedType = s.erasure(types);
2888 return FieldRef.field(
2889 typeToCodeType(s.owner.erasure(types)),
2890 s.name.toString(),
2891 typeToCodeType(erasedType));
2892 }
2893
2894 MethodRef symbolToMethodRef(Symbol s, Type site) {
2895 // @@@ Made Gen::binaryQualifier public, duplicate logic?
2896 // Ensure correct qualifying class is used in the reference, see JLS 13.1
2897 // https://docs.oracle.com/javase/specs/jls/se20/html/jls-13.html#jls-13.1
2898 return symbolToMethodRef(gen.binaryQualifier(s, types.erasure(site)));
2899 }
2900
2901 MethodRef symbolToMethodRef(Symbol s) {
2902 Type erasedType = s.erasure(types);
2903 return MethodRef.method(
2904 typeToCodeType(s.owner.erasure(types)),
2905 s.name.toString(),
2906 typeToCodeType(erasedType.getReturnType()),
2907 erasedType.getParameterTypes().stream().map(this::typeToCodeType).toArray(CodeType[]::new));
2908 }
2909
2910 FunctionType typeToFunctionType(Type t) {
2911 return CoreType.functionType(
2912 typeToCodeType(t.getReturnType()),
2913 t.getParameterTypes().stream().map(this::typeToCodeType).toArray(CodeType[]::new));
2914 }
2915
2916 RecordTypeRef symbolToRecordTypeRef(Symbol.ClassSymbol s) {
2917 CodeType recordType = typeToCodeType(s.type);
2918 List<RecordTypeRef.ComponentRef> components = s.getRecordComponents().stream()
2919 .map(rc -> new RecordTypeRef.ComponentRef(typeToCodeType(rc.type), rc.name.toString()))
2920 .toList();
2921 return RecordTypeRef.recordType(recordType, components);
2922 }
2923
2924 Env<AttrContext> attrEnv() {
2925 return typeEnvs.get(currentClassSym);
2926 }
2927
2928 Type asDenotable(Type t) {
2929 // The goal of this type mapping is to replace occurrences of intersection and union types
2930 // with fresh type variables with appropriate upper bounds. For instance, consider the generic type
2931 // Foo<A & B & C>. We need to:
2932 // 1. replace A & B & C with a fresh type variable, so this becomes Foo<#1>, #1 <: A
2933 // 2. add #1 to the set of type-variables to be projected
2934 // 3. run upward projection on Foo<#1>, which gives Foo<? extends A>
2935 // In other words, by replacing intersection types with fresh type variables we make sure that the output
2936 // of this method is a type that is fully denotable -- e.g. can be fully represented in terms of the
2937 // CodeType API.
2938 class DenotableProjection extends StructuralTypeMapping<Void> {
2939 final ListBuffer<Type> tvars = new ListBuffer<>();
2940 final Type t;
2941
2942 DenotableProjection(Type t) {
2943 tvars.appendList(types.captures(t));
2944 this.t = t;
2945 }
2946
2947 Type asDenotable() {
2948 return types.upward(apply(t), tvars.toList());
2949 }
2950
2951 @Override
2952 public Type visitClassType(Type.ClassType t, Void unused) {
2953 if (t.isIntersection()) {
2954 Type bound = visit(((IntersectionClassType) t).getExplicitComponents().head, null);
2955 return addTypeVar(bound, t.tsym);
2956 } else if (t.isUnion()) {
2957 Type bound = visit(((UnionClassType)t).getLub(), null);
2958 return addTypeVar(bound, t.tsym);
2959 } else {
2960 return super.visitClassType(t, null);
2961 }
2962 }
2963
2964 Type addTypeVar(Type bound, Symbol owner) {
2965 var tvsym = new TypeVariableSymbol(0, names.empty, null, owner);
2966 tvsym.type = new TypeVar(tvsym, bound, syms.botType);
2967 tvars.append(tvsym.type);
2968 return tvsym.type;
2969 }
2970 }
2971
2972 return new DenotableProjection(t).asDenotable();
2973 }
2974 }