1 /*
2 * Copyright (c) 2024, 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.VarSymbol;
35 import com.sun.tools.javac.code.Symtab;
36 import com.sun.tools.javac.code.Type;
37 import com.sun.tools.javac.code.Type.ArrayType;
38 import com.sun.tools.javac.code.Type.MethodType;
39 import com.sun.tools.javac.code.TypeTag;
40 import com.sun.tools.javac.code.Types;
41 import com.sun.tools.javac.comp.AttrContext;
42 import com.sun.tools.javac.comp.CaptureScanner;
43 import com.sun.tools.javac.comp.DeferredAttr.FilterScanner;
44 import com.sun.tools.javac.comp.Env;
45 import com.sun.tools.javac.comp.Flow;
46 import com.sun.tools.javac.comp.Lower;
47 import com.sun.tools.javac.comp.CodeReflectionTransformer;
48 import com.sun.tools.javac.comp.Resolve;
49 import com.sun.tools.javac.comp.TypeEnvs;
50 import com.sun.tools.javac.jvm.ByteCodes;
51 import com.sun.tools.javac.jvm.Gen;
52 import com.sun.tools.javac.tree.JCTree;
53 import com.sun.tools.javac.tree.JCTree.JCAnnotation;
54 import com.sun.tools.javac.tree.JCTree.JCArrayAccess;
55 import com.sun.tools.javac.tree.JCTree.JCAssign;
56 import com.sun.tools.javac.tree.JCTree.JCBinary;
57 import com.sun.tools.javac.tree.JCTree.JCBlock;
58 import com.sun.tools.javac.tree.JCTree.JCClassDecl;
59 import com.sun.tools.javac.tree.JCTree.JCExpression;
60 import com.sun.tools.javac.tree.JCTree.JCFieldAccess;
61 import com.sun.tools.javac.tree.JCTree.JCFunctionalExpression;
62 import com.sun.tools.javac.tree.JCTree.JCIdent;
63 import com.sun.tools.javac.tree.JCTree.JCLambda;
64 import com.sun.tools.javac.tree.JCTree.JCLiteral;
65 import com.sun.tools.javac.tree.JCTree.JCMemberReference;
66 import com.sun.tools.javac.tree.JCTree.JCMemberReference.ReferenceKind;
67 import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
68 import com.sun.tools.javac.tree.JCTree.JCMethodInvocation;
69 import com.sun.tools.javac.tree.JCTree.JCModuleDecl;
70 import com.sun.tools.javac.tree.JCTree.JCNewArray;
71 import com.sun.tools.javac.tree.JCTree.JCNewClass;
72 import com.sun.tools.javac.tree.JCTree.JCReturn;
73 import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
74 import com.sun.tools.javac.tree.JCTree.JCAssert;
75 import com.sun.tools.javac.tree.JCTree.Tag;
76 import com.sun.tools.javac.tree.TreeInfo;
77 import com.sun.tools.javac.tree.TreeMaker;
78 import com.sun.tools.javac.tree.TreeScanner;
79 import com.sun.tools.javac.tree.TreeTranslator;
80 import com.sun.tools.javac.util.Assert;
81 import com.sun.tools.javac.util.Context;
82 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
83 import com.sun.tools.javac.util.ListBuffer;
84 import com.sun.tools.javac.util.Log;
85 import com.sun.tools.javac.util.Name;
86 import com.sun.tools.javac.util.Names;
87 import com.sun.tools.javac.util.Options;
88 import jdk.incubator.code.*;
89 import jdk.incubator.code.extern.DialectFactory;
90 import jdk.incubator.code.dialect.core.*;
91 import jdk.incubator.code.dialect.java.*;
92 import jdk.incubator.code.dialect.java.WildcardType.BoundKind;
93
94 import javax.lang.model.element.Modifier;
95 import javax.tools.JavaFileObject;
96 import java.lang.constant.ClassDesc;
97 import java.util.*;
98 import java.util.function.Function;
99 import java.util.function.Supplier;
100
101 import static com.sun.tools.javac.code.Flags.*;
102 import static com.sun.tools.javac.code.Kinds.Kind.MTH;
103 import static com.sun.tools.javac.code.Kinds.Kind.TYP;
104 import static com.sun.tools.javac.code.Kinds.Kind.VAR;
105 import static com.sun.tools.javac.code.TypeTag.BOT;
106 import static com.sun.tools.javac.code.TypeTag.CLASS;
107 import static com.sun.tools.javac.code.TypeTag.METHOD;
108 import static com.sun.tools.javac.code.TypeTag.NONE;
109 import static com.sun.tools.javac.main.Option.G_CUSTOM;
110
111 import static com.sun.tools.javac.resources.CompilerProperties.Errors.*;
112 import static com.sun.tools.javac.resources.CompilerProperties.Notes.*;
113
114 /**
115 * This a tree translator that adds the code model to all method declaration marked
116 * with the {@code CodeReflection} annotation. The model is expressed using the code
117 * reflection API (see jdk.internal.java.lang.reflect.code).
118 */
119 public class ReflectMethods extends TreeTranslator {
120 protected static final Context.Key<ReflectMethods> reflectMethodsKey = new Context.Key<>();
121
122 public static ReflectMethods instance(Context context) {
123 ReflectMethods instance = context.get(reflectMethodsKey);
124 if (instance == null)
125 instance = new ReflectMethods(context);
126 return instance;
127 }
128
129 private final Types types;
130 private final Names names;
131 private final Symtab syms;
132 private final Resolve resolve;
133 private final Gen gen;
134 private final Log log;
135 private final Lower lower;
136 private final TypeEnvs typeEnvs;
137 private final Flow flow;
138 private final CodeReflectionSymbols crSyms;
139 private final boolean dumpIR;
140 private final boolean lineDebugInfo;
141 private final CodeModelStorageOption codeModelStorageOption;
142
143 private TreeMaker make;
144 private ListBuffer<JCTree> classOps;
145 private Symbol.ClassSymbol currentClassSym;
146 private int lambdaCount;
147
148 @SuppressWarnings("this-escape")
149 protected ReflectMethods(Context context) {
150 context.put(reflectMethodsKey, this);
151 Options options = Options.instance(context);
152 dumpIR = options.isSet("dumpIR");
153 lineDebugInfo =
154 options.isUnset(G_CUSTOM) ||
155 options.isSet(G_CUSTOM, "lines");
156 codeModelStorageOption = CodeModelStorageOption.parse(options.get("codeModelStorageOption"));
157 names = Names.instance(context);
158 syms = Symtab.instance(context);
159 resolve = Resolve.instance(context);
160 types = Types.instance(context);
161 gen = Gen.instance(context);
162 log = Log.instance(context);
163 lower = Lower.instance(context);
164 typeEnvs = TypeEnvs.instance(context);
165 flow = Flow.instance(context);
166 crSyms = new CodeReflectionSymbols(context);
167 }
168
169 @Override
170 public void visitMethodDef(JCMethodDecl tree) {
171 if (tree.sym.attribute(crSyms.codeReflectionType.tsym) != null) {
172 if (currentClassSym.type.getEnclosingType().hasTag(CLASS)) {
173 // Reflectable methods in inner classes are not supported
174 log.error(tree, QuotedMethodInnerClass(currentClassSym.enclClass()));
175 } else {
176 // if the method is annotated, scan it
177 BodyScanner bodyScanner = new BodyScanner(tree);
178 CoreOp.FuncOp funcOp = bodyScanner.scanMethod();
179 if (dumpIR) {
180 // dump the method IR if requested
181 log.note(MethodIrDump(tree.sym.enclClass(), tree.sym, funcOp.toText()));
182 }
183 // create a static method that returns the op
184 classOps.add(opMethodDecl(methodName(symbolToMethodRef(tree.sym)), funcOp, codeModelStorageOption));
185 }
186 }
187 super.visitMethodDef(tree);
188 }
189
190 @Override
191 public void visitModuleDef(JCModuleDecl that) {
192 // do nothing
193 }
194
195 @Override
196 public void visitClassDef(JCClassDecl tree) {
197 ListBuffer<JCTree> prevClassOps = classOps;
198 Symbol.ClassSymbol prevClassSym = currentClassSym;
199 int prevLambdaCount = lambdaCount;
200 JavaFileObject prev = log.useSource(tree.sym.sourcefile);
201 try {
202 lambdaCount = 0;
203 currentClassSym = tree.sym;
204 classOps = new ListBuffer<>();
205 super.visitClassDef(tree);
206 tree.defs = tree.defs.prependList(classOps.toList());
207 } finally {
208 lambdaCount = prevLambdaCount;
209 classOps = prevClassOps;
210 currentClassSym = prevClassSym;
211 result = tree;
212 log.useSource(prev);
213 }
214 }
215
216 @Override
217 public void visitLambda(JCLambda tree) {
218 FunctionalExpressionKind kind = functionalKind(tree);
219 if (kind.isQuoted) {
220 if (currentClassSym.type.getEnclosingType().hasTag(CLASS)) {
221 // Quotable lambdas in inner classes are not supported
222 log.error(tree, QuotedLambdaInnerClass(currentClassSym.enclClass()));
223 result = tree;
224 return;
225 }
226
227 // quoted lambda - scan it
228 BodyScanner bodyScanner = new BodyScanner(tree, kind);
229 CoreOp.FuncOp funcOp = bodyScanner.scanLambda();
230 if (dumpIR) {
231 // dump the method IR if requested
232 log.note(QuotedIrDump(funcOp.toText()));
233 }
234 // create a static method that returns the FuncOp representing the lambda
235 JCMethodDecl opMethod = opMethodDecl(lambdaName(), funcOp, codeModelStorageOption);
236 classOps.add(opMethod);
237
238 switch (kind) {
239 case QUOTED_STRUCTURAL -> {
240 // @@@ Consider replacing with invokedynamic to quoted bootstrap method
241 // Thereby we avoid certain dependencies and hide specific details
242 ListBuffer<JCExpression> args = new ListBuffer<>();
243 // Get the func operation
244 JCIdent opMethodId = make.Ident(opMethod.sym);
245 JCExpression op = make.TypeCast(crSyms.funcOpType, make.App(opMethodId));
246 args.add(op);
247 // Append captured vars
248 ListBuffer<JCExpression> capturedArgs = quotedCapturedArgs(tree, bodyScanner);
249 args.appendList(capturedArgs.toList());
250 // Get the quoted instance by calling Quoted::quotedOp
251 JCMethodInvocation quotedInvoke = make.App(make.Ident(crSyms.quotedQuotedOp), args.toList());
252 quotedInvoke.varargsElement = syms.objectType;
253 super.visitLambda(tree);
254 result = quotedInvoke;
255 }
256 case QUOTABLE -> {
257 // leave the lambda in place, but also leave a trail for LambdaToMethod
258 tree.codeModel = opMethod.sym;
259 super.visitLambda(tree);
260 }
261 }
262 } else {
263 super.visitLambda(tree);
264 }
265 }
266
267 @Override
268 public void visitReference(JCMemberReference tree) {
269 FunctionalExpressionKind kind = functionalKind(tree);
270 Assert.check(kind != FunctionalExpressionKind.QUOTED_STRUCTURAL,
271 "structural quoting not supported for method references");
272 MemberReferenceToLambda memberReferenceToLambda = new MemberReferenceToLambda(tree, currentClassSym);
273 JCVariableDecl recvDecl = memberReferenceToLambda.receiverVar();
274 JCLambda lambdaTree = memberReferenceToLambda.lambda();
275
276 if (kind.isQuoted) {
277 if (currentClassSym.type.getEnclosingType().hasTag(CLASS)) {
278 // Quotable lambdas in inner classes are not supported
279 log.error(tree, QuotedMrefInnerClass(currentClassSym.enclClass()));
280 result = tree;
281 return;
282 }
283
284 // quoted lambda - scan it
285 BodyScanner bodyScanner = new BodyScanner(lambdaTree, kind);
286 CoreOp.FuncOp funcOp = bodyScanner.scanLambda();
287 if (dumpIR) {
288 // dump the method IR if requested
289 log.note(QuotedIrDump(funcOp.toText()));
290 }
291 // create a method that returns the FuncOp representing the lambda
292 JCMethodDecl opMethod = opMethodDecl(lambdaName(), funcOp, codeModelStorageOption);
293 classOps.add(opMethod);
294 tree.codeModel = opMethod.sym;
295 super.visitReference(tree);
296 if (recvDecl != null) {
297 result = copyReferenceWithReceiverVar(tree, recvDecl);
298 }
299 } else {
300 super.visitReference(tree);
301 }
302 }
303
304 // @@@: Only used for quoted lambda, not quotable ones. Remove?
305 ListBuffer<JCExpression> quotedCapturedArgs(DiagnosticPosition pos, BodyScanner bodyScanner) {
306 ListBuffer<JCExpression> capturedArgs = new ListBuffer<>();
307 for (Symbol capturedSym : bodyScanner.stack.localToOp.keySet()) {
308 if (capturedSym.kind == Kind.VAR) {
309 // captured var
310 VarSymbol var = (VarSymbol)capturedSym;
311 if (var.getConstValue() == null) {
312 capturedArgs.add(make.at(pos).Ident(capturedSym));
313 }
314 } else {
315 throw new AssertionError("Unexpected captured symbol: " + capturedSym);
316 }
317 }
318 if (capturedArgs.size() < bodyScanner.top.body.entryBlock().parameters().size()) {
319 // needs to capture 'this'
320 capturedArgs.prepend(make.at(pos).This(currentClassSym.type));
321 }
322 return capturedArgs;
323 }
324
325 /*
326 * Creates a let expression of the kind:
327 * let $recv in $recv::memberRef
328 *
329 * This is required to make sure that LambdaToMethod doesn't end up emitting the
330 * code for capturing the bound method reference receiver twice.
331 */
332 JCExpression copyReferenceWithReceiverVar(JCMemberReference ref, JCVariableDecl recvDecl) {
333 JCMemberReference newRef = make.at(ref).Reference(ref.mode, ref.name, make.Ident(recvDecl.sym), ref.typeargs);
334 newRef.type = ref.type;
335 newRef.target = ref.target;
336 newRef.refPolyKind = ref.refPolyKind;
337 newRef.referentType = ref.referentType;
338 newRef.kind = ref.kind;
339 newRef.varargsElement = ref.varargsElement;
340 newRef.ownerAccessible = ref.ownerAccessible;
341 newRef.sym = ref.sym;
342 newRef.codeModel = ref.codeModel;
343 return make.at(ref).LetExpr(recvDecl, newRef).setType(newRef.type);
344 }
345
346 Name lambdaName() {
347 return names.fromString("lambda").append('$', names.fromString(String.valueOf(lambdaCount++)));
348 }
349
350 Name methodName(MethodRef method) {
351 char[] sigCh = method.toString().toCharArray();
352 for (int i = 0; i < sigCh.length; i++) {
353 switch (sigCh[i]) {
354 case '.', ';', '[', '/' -> sigCh[i] = '$';
355 }
356 }
357 return names.fromChars(sigCh, 0, sigCh.length);
358 }
359
360 // @@@ Retain enum for when we might add another storage to test
361 // and compare
362 private enum CodeModelStorageOption {
363 CODE_BUILDER;
364
365 public static CodeModelStorageOption parse(String s) {
366 if (s == null) {
367 return CodeModelStorageOption.CODE_BUILDER;
368 }
369 return CodeModelStorageOption.valueOf(s);
370 }
371 }
372
373 private JCMethodDecl opMethodDecl(Name methodName, CoreOp.FuncOp op, CodeModelStorageOption codeModelStorageOption) {
374 // Create the method that constructs the code model stored in the class file
375 var mt = new MethodType(com.sun.tools.javac.util.List.nil(), crSyms.opType,
376 com.sun.tools.javac.util.List.nil(), syms.methodClass);
377 var ms = new MethodSymbol(PRIVATE | STATIC | SYNTHETIC, methodName, mt, currentClassSym);
378 currentClassSym.members().enter(ms);
379
380 // Create the method body
381 // Code model is stored as code that builds the code model
382 // using the builder API and public APIs
383 var opBuilder = OpBuilder.createBuilderFunction(op,
384 b -> b.op(JavaOp.fieldLoad(
385 FieldRef.field(JavaOp.class, "JAVA_DIALECT_FACTORY", DialectFactory.class))));
386 var codeModelTranslator = new CodeModelTranslator();
387 var body = codeModelTranslator.translateFuncOp(opBuilder, ms);
388
389 var md = make.MethodDef(ms, make.Block(0, com.sun.tools.javac.util.List.of(body)));
390 return md;
391 }
392
393 public JCTree translateTopLevelClass(JCTree cdef, TreeMaker make) {
394 // note that this method does NOT support recursion.
395 this.make = make;
396 return translate(cdef);
397 }
398
399 public CoreOp.FuncOp getMethodBody(Symbol.ClassSymbol classSym, JCMethodDecl methodDecl, JCBlock attributedBody, TreeMaker make) {
400 // if the method is annotated, scan it
401 // Called from JavacElements::getBody
402 try {
403 this.make = make;
404 currentClassSym = classSym;
405 BodyScanner bodyScanner = new BodyScanner(methodDecl, attributedBody);
406 return bodyScanner.scanMethod();
407 } finally {
408 currentClassSym = null;
409 this.make = null;
410 }
411 }
412
413 static class BodyStack {
414 final BodyStack parent;
415
416 // Tree associated with body
417 final JCTree tree;
418
419 // Body to add blocks
420 final Body.Builder body;
421 // Current block to add operations
422 Block.Builder block;
423
424 // Map of symbols (method arguments and local variables) to varOp values
425 final Map<Symbol, Value> localToOp;
426
427 // Label
428 Map.Entry<String, Op.Result> label;
429
430 BodyStack(BodyStack parent, JCTree tree, FunctionType bodyType) {
431 this.parent = parent;
432
433 this.tree = tree;
434
435 this.body = Body.Builder.of(parent != null ? parent.body : null, bodyType);
436 this.block = body.entryBlock();
437
438 this.localToOp = new LinkedHashMap<>(); // order is important for captured values
439 }
440
441 public void setLabel(String labelName, Op.Result labelValue) {
442 if (label != null) {
443 throw new IllegalStateException("Label already defined: " + labelName);
444 }
445 label = Map.entry(labelName, labelValue);
446 }
447 }
448
449 class BodyScanner extends TreeScanner {
450 private final JCTree body;
451 private final Name name;
452 private final BodyStack top;
453 private BodyStack stack;
454 private Op lastOp;
455 private Value result;
456 private Type pt = Type.noType;
457 private final boolean isQuoted;
458 private Type bodyTarget;
459 private JCTree currentNode;
460 private final Map<Symbol, List<Symbol>> localCaptures = new HashMap<>();
461
462 BodyScanner(JCMethodDecl tree) {
463 this(tree, tree.body);
464 }
465
466 BodyScanner(JCMethodDecl tree, JCBlock body) {
467 this.currentNode = tree;
468 this.body = body;
469 this.name = tree.name;
470 this.isQuoted = false;
471
472 List<TypeElement> parameters = new ArrayList<>();
473 int blockArgOffset = 0;
474 // Instance methods model "this" as an additional argument occurring
475 // before all other arguments.
476 // @@@ Inner classes.
477 // We need to capture all "this", in nested order, as arguments.
478 if (!tree.getModifiers().getFlags().contains(Modifier.STATIC)) {
479 parameters.add(typeToTypeElement(tree.sym.owner.type));
480 blockArgOffset++;
481 }
482 tree.sym.type.getParameterTypes().stream().map(ReflectMethods.this::typeToTypeElement).forEach(parameters::add);
483
484 FunctionType bodyType = CoreType.functionType(
485 typeToTypeElement(tree.sym.type.getReturnType()), parameters);
486
487 this.stack = this.top = new BodyStack(null, tree.body, bodyType);
488
489 // @@@ this as local variable? (it can never be stored to)
490 for (int i = 0 ; i < tree.params.size() ; i++) {
491 Op.Result paramOp = append(CoreOp.var(
492 tree.params.get(i).name.toString(),
493 top.block.parameters().get(blockArgOffset + i)));
494 top.localToOp.put(tree.params.get(i).sym, paramOp);
495 }
496
497 bodyTarget = tree.sym.type.getReturnType();
498 }
499
500 BodyScanner(JCLambda tree, FunctionalExpressionKind kind) {
501 Assert.check(kind != FunctionalExpressionKind.NOT_QUOTED);
502
503 this.currentNode = tree;
504 this.body = tree;
505 this.name = names.fromString("quotedLambda");
506 this.isQuoted = true;
507
508 QuotableLambdaCaptureScanner lambdaCaptureScanner =
509 new QuotableLambdaCaptureScanner(tree);
510
511 List<VarSymbol> capturedSymbols = lambdaCaptureScanner.analyzeCaptures();
512 int blockParamOffset = 0;
513
514 ListBuffer<Type> capturedTypes = new ListBuffer<>();
515 if (lambdaCaptureScanner.capturesThis) {
516 capturedTypes.add(currentClassSym.type);
517 blockParamOffset++;
518 }
519 for (Symbol s : capturedSymbols) {
520 capturedTypes.add(s.type);
521 }
522
523 MethodType mtype = new MethodType(capturedTypes.toList(), crSyms.quotedType,
524 com.sun.tools.javac.util.List.nil(), syms.methodClass);
525 FunctionType mtDesc = CoreType.functionType(typeToTypeElement(mtype.restype),
526 mtype.getParameterTypes().map(ReflectMethods.this::typeToTypeElement));
527
528 this.stack = this.top = new BodyStack(null, tree.body, mtDesc);
529
530 // add captured variables mappings
531 for (int i = 0 ; i < capturedSymbols.size() ; i++) {
532 Symbol capturedSymbol = capturedSymbols.get(i);
533 var capturedArg = top.block.parameters().get(blockParamOffset + i);
534 top.localToOp.put(capturedSymbol,
535 append(CoreOp.var(capturedSymbol.name.toString(), capturedArg)));
536 }
537
538 // add captured constant mappings
539 for (Map.Entry<Symbol, Object> constantCapture : lambdaCaptureScanner.constantCaptures.entrySet()) {
540 Symbol capturedSymbol = constantCapture.getKey();
541 var capturedArg = append(CoreOp.constant(typeToTypeElement(capturedSymbol.type),
542 constantCapture.getValue()));
543 top.localToOp.put(capturedSymbol,
544 append(CoreOp.var(capturedSymbol.name.toString(), capturedArg)));
545 }
546
547 bodyTarget = tree.target.getReturnType();
548 }
549
550 /**
551 * Compute the set of local variables captured by a quotable lambda expression.
552 * Inspired from LambdaToMethod's LambdaCaptureScanner.
553 */
554 class QuotableLambdaCaptureScanner extends CaptureScanner {
555 boolean capturesThis;
556 Set<ClassSymbol> seenClasses = new HashSet<>();
557 Map<Symbol, Object> constantCaptures = new HashMap<>();
558
559 QuotableLambdaCaptureScanner(JCLambda ownerTree) {
560 super(ownerTree);
561 }
562
563 @Override
564 public void visitClassDef(JCClassDecl tree) {
565 seenClasses.add(tree.sym);
566 super.visitClassDef(tree);
567 }
568
569 @Override
570 public void visitIdent(JCIdent tree) {
571 if (!tree.sym.isStatic() &&
572 tree.sym.owner.kind == TYP &&
573 (tree.sym.kind == VAR || tree.sym.kind == MTH) &&
574 !seenClasses.contains(tree.sym.owner)) {
575 // a reference to an enclosing field or method, we need to capture 'this'
576 capturesThis = true;
577 } else if (tree.sym.kind == VAR && ((VarSymbol)tree.sym).getConstValue() != null) {
578 // record the constant value associated with this
579 constantCaptures.put(tree.sym, ((VarSymbol)tree.sym).getConstValue());
580 } else {
581 // might be a local capture
582 super.visitIdent(tree);
583 }
584 }
585
586 @Override
587 public void visitSelect(JCFieldAccess tree) {
588 if (tree.sym.kind == VAR &&
589 (tree.sym.name == names._this ||
590 tree.sym.name == names._super) &&
591 !seenClasses.contains(tree.sym.type.tsym)) {
592 capturesThis = true;
593 }
594 super.visitSelect(tree);
595 }
596
597 @Override
598 public void visitNewClass(JCNewClass tree) {
599 if (tree.type.tsym.owner.kind == MTH &&
600 !seenClasses.contains(tree.type.tsym)) {
601 throw unsupported(tree);
602 }
603 super.visitNewClass(tree);
604 }
605
606 @Override
607 public void visitAnnotation(JCAnnotation tree) {
608 // do nothing (annotation values look like captured instance fields)
609 }
610 }
611
612 @Override
613 public void scan(JCTree tree) {
614 JCTree prev = currentNode;
615 currentNode = tree;
616 try {
617 super.scan(tree);
618 } finally {
619 currentNode = prev;
620 }
621 }
622
623 void pushBody(JCTree tree, FunctionType bodyType) {
624 stack = new BodyStack(stack, tree, bodyType);
625 lastOp = null; // reset
626 }
627
628 void popBody() {
629 stack = stack.parent;
630 }
631
632 Value varOpValue(Symbol sym) {
633 BodyStack s = stack;
634 while (s != null) {
635 Value v = s.localToOp.get(sym);
636 if (v != null) {
637 return v;
638 }
639 s = s.parent;
640 }
641 throw new NoSuchElementException(sym.toString());
642 }
643
644 Value thisValue() { // @@@: outer this?
645 return top.block.parameters().get(0);
646 }
647
648 Value getLabel(String labelName) {
649 BodyStack s = stack;
650 while (s != null) {
651 if (s.label != null && s.label.getKey().equals(labelName)) {
652 return s.label.getValue();
653 }
654 s = s.parent;
655 }
656 throw new NoSuchElementException(labelName);
657 }
658
659 private Op.Result append(Op op) {
660 return append(op, generateLocation(currentNode, false), stack);
661 }
662
663 private Op.Result append(Op op, Location l) {
664 return append(op, l, stack);
665 }
666
667 private Op.Result append(Op op, Location l, BodyStack stack) {
668 lastOp = op;
669 op.setLocation(l);
670 return stack.block.op(op);
671 }
672
673 Location generateLocation(JCTree node, boolean includeSourceReference) {
674 if (!lineDebugInfo) {
675 return Location.NO_LOCATION;
676 }
677
678 int pos = node.getStartPosition();
679 int line = log.currentSource().getLineNumber(pos);
680 int col = log.currentSource().getColumnNumber(pos, false);
681 String path;
682 if (includeSourceReference) {
683 path = log.currentSource().getFile().toUri().toString();
684 } else {
685 path = null;
686 }
687 return new Location(path, line, col);
688 }
689
690 private void appendReturnOrUnreachable(JCTree body) {
691 // Append only if an existing terminating operation is not present
692 if (lastOp == null || !(lastOp instanceof Op.Terminating)) {
693 // If control can continue after the body append return.
694 // Otherwise, append unreachable.
695 if (isAliveAfter(body)) {
696 append(CoreOp.return_());
697 } else {
698 append(CoreOp.unreachable());
699 }
700 }
701 }
702
703 private boolean isAliveAfter(JCTree node) {
704 return flow.aliveAfter(typeEnvs.get(currentClassSym), node, make);
705 }
706
707 private <O extends Op & Op.Terminating> void appendTerminating(Supplier<O> sop) {
708 // Append only if an existing terminating operation is not present
709 if (lastOp == null || !(lastOp instanceof Op.Terminating)) {
710 append(sop.get());
711 }
712 }
713
714 public Value toValue(JCExpression expression, Type targetType) {
715 result = null; // reset
716 Type prevPt = pt;
717 try {
718 pt = targetType;
719 scan(expression);
720 return result != null ?
721 coerce(result, expression.type, targetType) :
722 null;
723 } finally {
724 pt = prevPt;
725 }
726 }
727
728 public Value toValue(JCExpression expression) {
729 return toValue(expression, Type.noType);
730 }
731
732 public Value toValue(JCTree.JCStatement statement) {
733 result = null; // reset
734 scan(statement);
735 return result;
736 }
737
738 Value coerce(Value sourceValue, Type sourceType, Type targetType) {
739 if (sourceType.isReference() && targetType.isReference() &&
740 !types.isSubtype(types.erasure(sourceType), types.erasure(targetType))) {
741 return append(JavaOp.cast(typeToTypeElement(targetType), sourceValue));
742 } else {
743 return convert(sourceValue, targetType);
744 }
745 }
746
747 Value boxIfNeeded(Value exprVal) {
748 Type source = typeElementToType(exprVal.type());
749 return source.hasTag(NONE) ?
750 exprVal : convert(exprVal, types.boxedTypeOrType(source));
751 }
752
753 Value unboxIfNeeded(Value exprVal) {
754 Type source = typeElementToType(exprVal.type());
755 return source.hasTag(NONE) ?
756 exprVal : convert(exprVal, types.unboxedTypeOrType(source));
757 }
758
759 Value convert(Value exprVal, Type target) {
760 Type source = typeElementToType(exprVal.type());
761 boolean sourcePrimitive = source.isPrimitive();
762 boolean targetPrimitive = target.isPrimitive();
763 if (target.hasTag(NONE)) {
764 return exprVal;
765 } else if (sourcePrimitive == targetPrimitive) {
766 if (!sourcePrimitive || types.isSameType(source, target)) {
767 return exprVal;
768 } else {
769 // implicit primitive conversion
770 return append(JavaOp.conv(typeToTypeElement(target), exprVal));
771 }
772 } else if (sourcePrimitive) {
773 // we need to box
774 Type unboxedTarget = types.unboxedType(target);
775 if (!unboxedTarget.hasTag(NONE)) {
776 // non-Object target
777 if (!types.isConvertible(source, unboxedTarget)) {
778 exprVal = convert(exprVal, unboxedTarget);
779 }
780 return box(exprVal, target);
781 } else {
782 // Object target
783 return box(exprVal, types.boxedClass(source).type);
784 }
785 } else {
786 // we need to unbox
787 return unbox(exprVal, source, target, types.unboxedType(source));
788 }
789 }
790
791 Value box(Value valueExpr, Type box) {
792 // Boxing is a static method e.g., java.lang.Integer::valueOf(int)java.lang.Integer
793 MethodRef boxMethod = MethodRef.method(typeToTypeElement(box), names.valueOf.toString(),
794 CoreType.functionType(typeToTypeElement(box), typeToTypeElement(types.unboxedType(box))));
795 return append(JavaOp.invoke(boxMethod, valueExpr));
796 }
797
798 Value unbox(Value valueExpr, Type box, Type primitive, Type unboxedType) {
799 if (unboxedType.hasTag(NONE)) {
800 // Object target, first downcast to correct wrapper type
801 unboxedType = primitive;
802 box = types.boxedClass(unboxedType).type;
803 valueExpr = append(JavaOp.cast(typeToTypeElement(box), valueExpr));
804 }
805 // Unboxing is a virtual method e.g., java.lang.Integer::intValue()int
806 MethodRef unboxMethod = MethodRef.method(typeToTypeElement(box),
807 unboxedType.tsym.name.append(names.Value).toString(),
808 CoreType.functionType(typeToTypeElement(unboxedType)));
809 return append(JavaOp.invoke(unboxMethod, valueExpr));
810 }
811
812 @Override
813 public void visitVarDef(JCVariableDecl tree) {
814 JavaType javaType = typeToTypeElement(tree.type);
815 if (tree.init != null) {
816 Value initOp = toValue(tree.init, tree.type);
817 result = append(CoreOp.var(tree.name.toString(), javaType, initOp));
818 } else {
819 // Uninitialized
820 result = append(CoreOp.var(tree.name.toString(), javaType));
821 }
822 stack.localToOp.put(tree.sym, result);
823 }
824
825 @Override
826 public void visitAssign(JCAssign tree) {
827 // Consume top node that applies to write access
828 JCTree lhs = TreeInfo.skipParens(tree.lhs);
829 Type target = tree.lhs.type;
830 switch (lhs.getTag()) {
831 case IDENT: {
832 JCIdent assign = (JCIdent) lhs;
833
834 // Scan the rhs, the assign expression result is its input
835 result = toValue(tree.rhs, target);
836
837 Symbol sym = assign.sym;
838 switch (sym.getKind()) {
839 case LOCAL_VARIABLE, PARAMETER -> {
840 Value varOp = varOpValue(sym);
841 append(CoreOp.varStore(varOp, result));
842 }
843 case FIELD -> {
844 FieldRef fd = symbolToFieldRef(sym, symbolSiteType(sym));
845 if (sym.isStatic()) {
846 append(JavaOp.fieldStore(fd, result));
847 } else {
848 append(JavaOp.fieldStore(fd, thisValue(), result));
849 }
850 }
851 default -> {
852 // @@@ Cannot reach here?
853 throw unsupported(tree);
854 }
855 }
856 break;
857 }
858 case SELECT: {
859 JCFieldAccess assign = (JCFieldAccess) lhs;
860
861 Value receiver = toValue(assign.selected);
862
863 // Scan the rhs, the assign expression result is its input
864 result = toValue(tree.rhs, target);
865
866 Symbol sym = assign.sym;
867 FieldRef fr = symbolToFieldRef(sym, assign.selected.type);
868 if (sym.isStatic()) {
869 append(JavaOp.fieldStore(fr, result));
870 } else {
871 append(JavaOp.fieldStore(fr, receiver, result));
872 }
873 break;
874 }
875 case INDEXED: {
876 JCArrayAccess assign = (JCArrayAccess) lhs;
877
878 Value array = toValue(assign.indexed);
879 Value index = toValue(assign.index);
880
881 // Scan the rhs, the assign expression result is its input
882 result = toValue(tree.rhs, target);
883
884 append(JavaOp.arrayStoreOp(array, index, result));
885 break;
886 }
887 default:
888 throw unsupported(tree);
889 }
890 }
891
892 @Override
893 public void visitAssignop(JCTree.JCAssignOp tree) {
894 // Capture applying rhs and operation
895 Function<Value, Value> scanRhs = (lhs) -> {
896 Type unboxedType = types.unboxedTypeOrType(tree.type);
897 Value rhs;
898 if (tree.operator.opcode == ByteCodes.string_add && tree.rhs.type.isPrimitive()) {
899 rhs = toValue(tree.rhs);
900 } else {
901 rhs = toValue(tree.rhs, unboxedType);
902 }
903 lhs = unboxIfNeeded(lhs);
904
905 Value assignOpResult = switch (tree.getTag()) {
906
907 // Arithmetic operations
908 case PLUS_ASG -> {
909 if (tree.operator.opcode == ByteCodes.string_add) {
910 yield append(JavaOp.concat(lhs, rhs));
911 } else {
912 yield append(JavaOp.add(lhs, rhs));
913 }
914 }
915 case MINUS_ASG -> append(JavaOp.sub(lhs, rhs));
916 case MUL_ASG -> append(JavaOp.mul(lhs, rhs));
917 case DIV_ASG -> append(JavaOp.div(lhs, rhs));
918 case MOD_ASG -> append(JavaOp.mod(lhs, rhs));
919
920 // Bitwise operations (including their boolean variants)
921 case BITOR_ASG -> append(JavaOp.or(lhs, rhs));
922 case BITAND_ASG -> append(JavaOp.and(lhs, rhs));
923 case BITXOR_ASG -> append(JavaOp.xor(lhs, rhs));
924
925 // Shift operations
926 case SL_ASG -> append(JavaOp.lshl(lhs, rhs));
927 case SR_ASG -> append(JavaOp.ashr(lhs, rhs));
928 case USR_ASG -> append(JavaOp.lshr(lhs, rhs));
929
930
931 default -> throw unsupported(tree);
932 };
933 return result = convert(assignOpResult, tree.type);
934 };
935
936 applyCompoundAssign(tree.lhs, scanRhs);
937 }
938
939 void applyCompoundAssign(JCTree.JCExpression lhs, Function<Value, Value> scanRhs) {
940 // Consume top node that applies to access
941 lhs = TreeInfo.skipParens(lhs);
942 switch (lhs.getTag()) {
943 case IDENT -> {
944 JCIdent assign = (JCIdent) lhs;
945
946 Symbol sym = assign.sym;
947 switch (sym.getKind()) {
948 case LOCAL_VARIABLE, PARAMETER -> {
949 Value varOp = varOpValue(sym);
950
951 Op.Result lhsOpValue = append(CoreOp.varLoad(varOp));
952 // Scan the rhs
953 Value r = scanRhs.apply(lhsOpValue);
954
955 append(CoreOp.varStore(varOp, r));
956 }
957 case FIELD -> {
958 FieldRef fr = symbolToFieldRef(sym, symbolSiteType(sym));
959
960 Op.Result lhsOpValue;
961 TypeElement resultType = typeToTypeElement(sym.type);
962 if (sym.isStatic()) {
963 lhsOpValue = append(JavaOp.fieldLoad(resultType, fr));
964 } else {
965 lhsOpValue = append(JavaOp.fieldLoad(resultType, fr, thisValue()));
966 }
967 // Scan the rhs
968 Value r = scanRhs.apply(lhsOpValue);
969
970 if (sym.isStatic()) {
971 append(JavaOp.fieldStore(fr, r));
972 } else {
973 append(JavaOp.fieldStore(fr, thisValue(), r));
974 }
975 }
976 default -> {
977 // @@@ Cannot reach here?
978 throw unsupported(lhs);
979 }
980 }
981 }
982 case SELECT -> {
983 JCFieldAccess assign = (JCFieldAccess) lhs;
984
985 Value receiver = toValue(assign.selected);
986
987 Symbol sym = assign.sym;
988 FieldRef fr = symbolToFieldRef(sym, assign.selected.type);
989
990 Op.Result lhsOpValue;
991 TypeElement resultType = typeToTypeElement(sym.type);
992 if (sym.isStatic()) {
993 lhsOpValue = append(JavaOp.fieldLoad(resultType, fr));
994 } else {
995 lhsOpValue = append(JavaOp.fieldLoad(resultType, fr, receiver));
996 }
997 // Scan the rhs
998 Value r = scanRhs.apply(lhsOpValue);
999
1000 if (sym.isStatic()) {
1001 append(JavaOp.fieldStore(fr, r));
1002 } else {
1003 append(JavaOp.fieldStore(fr, receiver, r));
1004 }
1005 }
1006 case INDEXED -> {
1007 JCArrayAccess assign = (JCArrayAccess) lhs;
1008
1009 Value array = toValue(assign.indexed);
1010 Value index = toValue(assign.index);
1011
1012 Op.Result lhsOpValue = append(JavaOp.arrayLoadOp(array, index));
1013 // Scan the rhs
1014 Value r = scanRhs.apply(lhsOpValue);
1015
1016 append(JavaOp.arrayStoreOp(array, index, r));
1017 }
1018 default -> throw unsupported(lhs);
1019 }
1020 }
1021
1022 @Override
1023 public void visitIdent(JCIdent tree) {
1024 // Visited only for read access
1025
1026 Symbol sym = tree.sym;
1027 switch (sym.getKind()) {
1028 case LOCAL_VARIABLE, RESOURCE_VARIABLE, BINDING_VARIABLE, PARAMETER, EXCEPTION_PARAMETER ->
1029 result = loadVar(sym);
1030 case FIELD, ENUM_CONSTANT -> {
1031 if (sym.name.equals(names._this) || sym.name.equals(names._super)) {
1032 result = thisValue();
1033 } else {
1034 FieldRef fr = symbolToFieldRef(sym, symbolSiteType(sym));
1035 TypeElement resultType = typeToTypeElement(sym.type);
1036 if (sym.isStatic()) {
1037 result = append(JavaOp.fieldLoad(resultType, fr));
1038 } else {
1039 result = append(JavaOp.fieldLoad(resultType, fr, thisValue()));
1040 }
1041 }
1042 }
1043 case INTERFACE, CLASS, ENUM -> {
1044 result = null;
1045 }
1046 default -> {
1047 // @@@ Cannot reach here?
1048 throw unsupported(tree);
1049 }
1050 }
1051 }
1052
1053 private Value loadVar(Symbol sym) {
1054 Value varOp = varOpValue(sym);
1055 Assert.check(varOp.type() instanceof VarType);
1056 return append(CoreOp.varLoad(varOp));
1057 }
1058
1059 @Override
1060 public void visitTypeIdent(JCTree.JCPrimitiveTypeTree tree) {
1061 result = null;
1062 }
1063
1064 @Override
1065 public void visitTypeArray(JCTree.JCArrayTypeTree tree) {
1066 result = null; // MyType[].class is handled in visitSelect just as MyType.class
1067 }
1068
1069 @Override
1070 public void visitSelect(JCFieldAccess tree) {
1071 // Visited only for read access
1072
1073 Type qualifierTarget = qualifierTarget(tree);
1074 // @@@: might cause redundant load if accessed symbol is static but the qualifier is not a type
1075 Value receiver = toValue(tree.selected);
1076
1077 if (tree.name.equals(names._class)) {
1078 result = append(CoreOp.constant(JavaType.J_L_CLASS, typeToTypeElement(tree.selected.type)));
1079 } else if (types.isArray(tree.selected.type)) {
1080 if (tree.sym.equals(syms.lengthVar)) {
1081 result = append(JavaOp.arrayLength(receiver));
1082 } else {
1083 // Should not reach here
1084 throw unsupported(tree);
1085 }
1086 } else {
1087 Symbol sym = tree.sym;
1088 switch (sym.getKind()) {
1089 case FIELD, ENUM_CONSTANT -> {
1090 if (sym.name.equals(names._this) || sym.name.equals(names._super)) {
1091 result = thisValue();
1092 } else {
1093 FieldRef fr = symbolToFieldRef(sym, qualifierTarget.hasTag(NONE) ?
1094 tree.selected.type : qualifierTarget);
1095 TypeElement resultType = typeToTypeElement(types.memberType(tree.selected.type, sym));
1096 if (sym.isStatic()) {
1097 result = append(JavaOp.fieldLoad(resultType, fr));
1098 } else {
1099 result = append(JavaOp.fieldLoad(resultType, fr, receiver));
1100 }
1101 }
1102 }
1103 case INTERFACE, CLASS, ENUM -> {
1104 result = null;
1105 }
1106 default -> {
1107 // @@@ Cannot reach here?
1108 throw unsupported(tree);
1109 }
1110 }
1111 }
1112 }
1113
1114 @Override
1115 public void visitIndexed(JCArrayAccess tree) {
1116 // Visited only for read access
1117
1118 Value array = toValue(tree.indexed);
1119
1120 Value index = toValue(tree.index, typeElementToType(JavaType.INT));
1121
1122 result = append(JavaOp.arrayLoadOp(array, index));
1123 }
1124
1125 @Override
1126 public void visitApply(JCTree.JCMethodInvocation tree) {
1127 // @@@ Symbol.externalType, for use with inner classes
1128
1129 // @@@ this.xyz(...) calls in a constructor
1130
1131 JCTree meth = TreeInfo.skipParens(tree.meth);
1132 switch (meth.getTag()) {
1133 case IDENT: {
1134 JCIdent access = (JCIdent) meth;
1135
1136 Symbol sym = access.sym;
1137 List<Value> args = new ArrayList<>();
1138 JavaOp.InvokeOp.InvokeKind ik;
1139 if (!sym.isStatic()) {
1140 ik = JavaOp.InvokeOp.InvokeKind.INSTANCE;
1141 args.add(thisValue());
1142 } else {
1143 ik = JavaOp.InvokeOp.InvokeKind.STATIC;
1144 }
1145
1146 args.addAll(scanMethodArguments(tree.args, tree.meth.type, tree.varargsElement));
1147
1148 MethodRef mr = symbolToMethodRef(sym, symbolSiteType(sym));
1149 Value res = append(JavaOp.invoke(ik, tree.varargsElement != null,
1150 typeToTypeElement(meth.type.getReturnType()), mr, args));
1151 if (sym.type.getReturnType().getTag() != TypeTag.VOID) {
1152 result = res;
1153 }
1154 break;
1155 }
1156 case SELECT: {
1157 JCFieldAccess access = (JCFieldAccess) meth;
1158
1159 Type qualifierTarget = qualifierTarget(access);
1160 Value receiver = toValue(access.selected, qualifierTarget);
1161
1162 Symbol sym = access.sym;
1163 List<Value> args = new ArrayList<>();
1164 JavaOp.InvokeOp.InvokeKind ik;
1165 if (!sym.isStatic()) {
1166 args.add(receiver);
1167 // @@@ expr.super(...) for inner class super constructor calls
1168 ik = switch (access.selected) {
1169 case JCIdent i when i.sym.name.equals(names._super) -> JavaOp.InvokeOp.InvokeKind.SUPER;
1170 case JCFieldAccess fa when fa.sym.name.equals(names._super) -> JavaOp.InvokeOp.InvokeKind.SUPER;
1171 default -> JavaOp.InvokeOp.InvokeKind.INSTANCE;
1172 };
1173 } else {
1174 ik = JavaOp.InvokeOp.InvokeKind.STATIC;
1175 }
1176
1177 args.addAll(scanMethodArguments(tree.args, tree.meth.type, tree.varargsElement));
1178
1179 MethodRef mr = symbolToMethodRef(sym, qualifierTarget.hasTag(NONE) ?
1180 access.selected.type : qualifierTarget);
1181 JavaType returnType = typeToTypeElement(meth.type.getReturnType());
1182 JavaOp.InvokeOp iop = JavaOp.invoke(ik, tree.varargsElement != null,
1183 returnType, mr, args);
1184 Value res = append(iop);
1185 if (sym.type.getReturnType().getTag() != TypeTag.VOID) {
1186 result = res;
1187 }
1188 break;
1189 }
1190 default:
1191 unsupported(meth);
1192 }
1193 }
1194
1195 List<Value> scanMethodArguments(List<JCExpression> args, Type methodType, Type varargsElement) {
1196 ListBuffer<Value> argValues = new ListBuffer<>();
1197 com.sun.tools.javac.util.List<Type> targetTypes = methodType.getParameterTypes();
1198 if (varargsElement != null) {
1199 targetTypes = targetTypes.reverse().tail;
1200 for (int i = 0 ; i < args.size() - (methodType.getParameterTypes().size() - 1) ; i++) {
1201 targetTypes = targetTypes.prepend(varargsElement);
1202 }
1203 targetTypes = targetTypes.reverse();
1204 }
1205
1206 for (JCTree.JCExpression arg : args) {
1207 argValues.add(toValue(arg, targetTypes.head));
1208 targetTypes = targetTypes.tail;
1209 }
1210 return argValues.toList();
1211 }
1212
1213 @Override
1214 public void visitReference(JCTree.JCMemberReference tree) {
1215 MemberReferenceToLambda memberReferenceToLambda = new MemberReferenceToLambda(tree, currentClassSym);
1216 JCVariableDecl recv = memberReferenceToLambda.receiverVar();
1217 if (recv != null) {
1218 scan(recv);
1219 }
1220 scan(memberReferenceToLambda.lambda());
1221 }
1222
1223 Type qualifierTarget(JCFieldAccess tree) {
1224 Type selectedType = types.skipTypeVars(tree.selected.type, true);
1225 return selectedType.isCompound() ?
1226 tree.sym.owner.type :
1227 Type.noType;
1228 }
1229
1230 @Override
1231 public void visitTypeCast(JCTree.JCTypeCast tree) {
1232 Value v = toValue(tree.expr);
1233
1234 Type expressionType = tree.expr.type;
1235 Type type = tree.type;
1236 if (expressionType.isPrimitive() && type.isPrimitive()) {
1237 if (expressionType.equals(type)) {
1238 // Redundant cast
1239 result = v;
1240 } else {
1241 result = append(JavaOp.conv(typeToTypeElement(type), v));
1242 }
1243 } else if (expressionType.isPrimitive() || type.isPrimitive()) {
1244 result = convert(v, tree.type);
1245 } else if (!expressionType.hasTag(BOT) &&
1246 types.isAssignable(expressionType, type)) {
1247 // Redundant cast
1248 result = v;
1249 } else {
1250 // Reference cast
1251 JavaType jt = typeToTypeElement(types.erasure(type));
1252 result = append(JavaOp.cast(typeToTypeElement(type), jt, v));
1253 }
1254 }
1255
1256 @Override
1257 public void visitTypeTest(JCTree.JCInstanceOf tree) {
1258 Value target = toValue(tree.expr);
1259
1260 if (tree.pattern.getTag() != Tag.IDENT) {
1261 result = scanPattern(tree.getPattern(), target);
1262 } else {
1263 result = append(JavaOp.instanceOf(typeToTypeElement(tree.pattern.type), target));
1264 }
1265 }
1266
1267 Value scanPattern(JCTree.JCPattern pattern, Value target) {
1268 // Type of pattern
1269 JavaType patternType;
1270 if (pattern instanceof JCTree.JCBindingPattern p) {
1271 patternType = JavaOp.Pattern.bindingType(typeToTypeElement(p.type));
1272 } else if (pattern instanceof JCTree.JCRecordPattern p) {
1273 patternType = JavaOp.Pattern.recordType(typeToTypeElement(p.record.type));
1274 } else {
1275 throw unsupported(pattern);
1276 }
1277
1278 // Push pattern body
1279 pushBody(pattern, CoreType.functionType(patternType));
1280
1281 // @@@ Assumes just pattern nodes, likely will change when method patterns are supported
1282 // that have expressions for any arguments (which perhaps in turn may have pattern expressions)
1283 List<JCVariableDecl> variables = new ArrayList<>();
1284 class PatternScanner extends FilterScanner {
1285
1286 private Value result;
1287
1288 public PatternScanner() {
1289 super(Set.of(Tag.BINDINGPATTERN, Tag.RECORDPATTERN, Tag.ANYPATTERN));
1290 }
1291
1292 @Override
1293 public void visitBindingPattern(JCTree.JCBindingPattern binding) {
1294 JCVariableDecl var = binding.var;
1295 variables.add(var);
1296 boolean unnamedPatternVariable = var.name.isEmpty();
1297 String bindingName = unnamedPatternVariable ? null : var.name.toString();
1298 result = append(JavaOp.typePattern(typeToTypeElement(var.type), bindingName));
1299 }
1300
1301 @Override
1302 public void visitRecordPattern(JCTree.JCRecordPattern record) {
1303 // @@@ Is always Identifier to record?
1304 // scan(record.deconstructor);
1305
1306 List<Value> nestedValues = new ArrayList<>();
1307 for (JCTree.JCPattern jcPattern : record.nested) {
1308 // @@@ when we support ANYPATTERN, we must add result of toValue only if it's non-null
1309 // because passing null to recordPattern methods will cause an error
1310 nestedValues.add(toValue(jcPattern));
1311 }
1312
1313 result = append(JavaOp.recordPattern(symbolToRecordTypeRef(record.record), nestedValues));
1314 }
1315
1316 @Override
1317 public void visitAnyPattern(JCTree.JCAnyPattern anyPattern) {
1318 result = append(JavaOp.matchAllPattern());
1319 }
1320
1321 Value toValue(JCTree tree) {
1322 result = null;
1323 scan(tree);
1324 return result;
1325 }
1326 }
1327 // Scan pattern
1328 Value patternValue = new PatternScanner().toValue(pattern);
1329 append(CoreOp.core_yield(patternValue));
1330 Body.Builder patternBody = stack.body;
1331
1332 // Pop body
1333 popBody();
1334
1335 // Find nearest ancestor body stack element associated with a statement tree
1336 // @@@ Strengthen check of tree?
1337 BodyStack _variablesStack = stack;
1338 while (!(_variablesStack.tree instanceof JCTree.JCStatement)) {
1339 _variablesStack = _variablesStack.parent;
1340 }
1341 BodyStack variablesStack = _variablesStack;
1342
1343 // Create pattern var ops for pattern variables using the
1344 // builder associated with the nearest statement tree
1345 for (JCVariableDecl jcVar : variables) {
1346 // @@@ use uninitialized variable
1347 Value defaultValue = variablesStack.block.op(defaultValue(jcVar.type));
1348 Value init = convert(defaultValue, jcVar.type);
1349 Op.Result op = variablesStack.block.op(CoreOp.var(jcVar.name.toString(), typeToTypeElement(jcVar.type), init));
1350 variablesStack.localToOp.put(jcVar.sym, op);
1351 }
1352
1353 // Create pattern descriptor
1354 List<JavaType> patternDescParams = variables.stream().map(var -> typeToTypeElement(var.type)).toList();
1355 FunctionType matchFuncType = CoreType.functionType(JavaType.VOID, patternDescParams);
1356
1357 // Create the match body, assigning pattern values to pattern variables
1358 Body.Builder matchBody = Body.Builder.of(patternBody.ancestorBody(), matchFuncType);
1359 Block.Builder matchBuilder = matchBody.entryBlock();
1360 for (int i = 0; i < variables.size(); i++) {
1361 Value v = matchBuilder.parameters().get(i);
1362 Value var = variablesStack.localToOp.get(variables.get(i).sym);
1363 matchBuilder.op(CoreOp.varStore(var, v));
1364 }
1365 matchBuilder.op(CoreOp.core_yield());
1366
1367 // Create the match operation
1368 return append(JavaOp.match(target, patternBody, matchBody));
1369 }
1370
1371 @Override
1372 public void visitNewClass(JCTree.JCNewClass tree) {
1373 if (tree.def != null) {
1374 scan(tree.def);
1375 }
1376
1377 // @@@ Support local classes in pre-construction contexts
1378 if (tree.type.tsym.isDirectlyOrIndirectlyLocal() && (tree.type.tsym.flags() & NOOUTERTHIS) != 0) {
1379 throw unsupported(tree);
1380 }
1381
1382 List<TypeElement> argtypes = new ArrayList<>();
1383 Type type = tree.type;
1384 Type outer = type.getEnclosingType();
1385 List<Value> args = new ArrayList<>();
1386 if (!outer.hasTag(TypeTag.NONE)) {
1387 // Obtain outer value for inner class, and add as first argument
1388 JCTree.JCExpression encl = tree.encl;
1389 Value outerInstance;
1390 if (encl == null) {
1391 outerInstance = thisValue();
1392 } else {
1393 outerInstance = toValue(tree.encl);
1394 }
1395 args.add(outerInstance);
1396 argtypes.add(outerInstance.type());
1397 }
1398 if (tree.type.tsym.isDirectlyOrIndirectlyLocal()) {
1399 for (Symbol c : localCaptures.get(tree.type.tsym)) {
1400 args.add(loadVar(c));
1401 argtypes.add(symbolToErasedDesc(c));
1402 }
1403 }
1404
1405 // Create erased method type reference for constructor, where
1406 // the return type declares the class to instantiate
1407 // We need to manually construct the constructor reference,
1408 // as the signature of the constructor symbol is not augmented
1409 // with enclosing this and captured params.
1410 MethodRef methodRef = symbolToMethodRef(tree.constructor);
1411 argtypes.addAll(methodRef.type().parameterTypes());
1412 FunctionType constructorType = CoreType.functionType(
1413 symbolToErasedDesc(tree.constructor.owner),
1414 argtypes);
1415 ConstructorRef constructorRef = ConstructorRef.constructor(constructorType);
1416
1417 args.addAll(scanMethodArguments(tree.args, tree.constructorType, tree.varargsElement));
1418
1419 result = append(JavaOp.new_(tree.varargsElement != null, typeToTypeElement(type), constructorRef, args));
1420 }
1421
1422 @Override
1423 public void visitNewArray(JCTree.JCNewArray tree) {
1424 if (tree.elems != null) {
1425 int length = tree.elems.size();
1426 Op.Result a = append(JavaOp.newArray(
1427 typeToTypeElement(tree.type),
1428 append(CoreOp.constant(JavaType.INT, length))));
1429 int i = 0;
1430 for (JCExpression elem : tree.elems) {
1431 Value element = toValue(elem, types.elemtype(tree.type));
1432 append(JavaOp.arrayStoreOp(
1433 a,
1434 append(CoreOp.constant(JavaType.INT, i)),
1435 element));
1436 i++;
1437 }
1438
1439 result = a;
1440 } else {
1441 List<Value> indexes = new ArrayList<>();
1442 for (JCTree.JCExpression dim : tree.dims) {
1443 indexes.add(toValue(dim));
1444 }
1445
1446 JavaType arrayType = typeToTypeElement(tree.type);
1447 ConstructorRef constructorRef = ConstructorRef.constructor(arrayType,
1448 indexes.stream().map(Value::type).toList());
1449 result = append(JavaOp.new_(constructorRef, indexes));
1450 }
1451 }
1452
1453 @Override
1454 public void visitLambda(JCTree.JCLambda tree) {
1455 FunctionalExpressionKind kind = functionalKind(tree);
1456 final FunctionType lambdaType = switch (kind) {
1457 case QUOTED_STRUCTURAL -> typeToFunctionType(tree.target);
1458 default -> typeToFunctionType(types.findDescriptorType(tree.target));
1459 };
1460
1461 // Push quoted body
1462 // We can either be explicitly quoted or a structural quoted expression
1463 // within some larger reflected code
1464 if (isQuoted || kind == FunctionalExpressionKind.QUOTED_STRUCTURAL) {
1465 pushBody(tree.body, CoreType.FUNCTION_TYPE_VOID);
1466 }
1467
1468 // Push lambda body
1469 pushBody(tree.body, lambdaType);
1470
1471 // Map lambda parameters to varOp values
1472 for (int i = 0; i < tree.params.size(); i++) {
1473 JCVariableDecl p = tree.params.get(i);
1474 Op.Result paramOp = append(CoreOp.var(
1475 p.name.toString(),
1476 stack.block.parameters().get(i)));
1477 stack.localToOp.put(p.sym, paramOp);
1478 }
1479
1480 // Scan the lambda body
1481 if (tree.getBodyKind() == LambdaExpressionTree.BodyKind.EXPRESSION) {
1482 Value exprVal = toValue(((JCExpression) tree.body), tree.getDescriptorType(types).getReturnType());
1483 if (!tree.body.type.hasTag(TypeTag.VOID)) {
1484 append(CoreOp.return_(exprVal));
1485 } else {
1486 appendTerminating(CoreOp::return_);
1487 }
1488 } else {
1489 Type prevBodyTarget = bodyTarget;
1490 try {
1491 bodyTarget = tree.getDescriptorType(types).getReturnType();
1492 toValue(((JCTree.JCStatement) tree.body));
1493 appendReturnOrUnreachable(tree.body);
1494 } finally {
1495 bodyTarget = prevBodyTarget;
1496 }
1497 }
1498
1499 Op lambdaOp = switch (kind) {
1500 case QUOTED_STRUCTURAL -> {
1501 yield CoreOp.closure(stack.body);
1502 }
1503 case QUOTABLE, NOT_QUOTED -> {
1504 // Get the functional interface type
1505 JavaType fiType = typeToTypeElement(tree.target);
1506 // build functional lambda
1507 yield JavaOp.lambda(fiType, stack.body);
1508 }
1509 };
1510
1511 // Pop lambda body
1512 popBody();
1513
1514 Value lambdaResult;
1515 if (isQuoted) {
1516 lambdaResult = append(lambdaOp, generateLocation(tree, true));
1517 } else {
1518 lambdaResult = append(lambdaOp);
1519 }
1520
1521 if (isQuoted || kind == FunctionalExpressionKind.QUOTED_STRUCTURAL) {
1522 append(CoreOp.core_yield(lambdaResult));
1523 CoreOp.QuotedOp quotedOp = CoreOp.quoted(stack.body);
1524
1525 // Pop quoted body
1526 popBody();
1527
1528 lambdaResult = append(quotedOp);
1529 }
1530
1531 result = lambdaResult;
1532 }
1533
1534 @Override
1535 public void visitIf(JCTree.JCIf tree) {
1536 List<Body.Builder> bodies = new ArrayList<>();
1537
1538 while (tree != null) {
1539 JCTree.JCExpression cond = TreeInfo.skipParens(tree.cond);
1540
1541 // Push if condition
1542 pushBody(cond,
1543 CoreType.functionType(JavaType.BOOLEAN));
1544 Value last = toValue(cond);
1545 last = convert(last, typeElementToType(JavaType.BOOLEAN));
1546 // Yield the boolean result of the condition
1547 append(CoreOp.core_yield(last));
1548 bodies.add(stack.body);
1549
1550 // Pop if condition
1551 popBody();
1552
1553 // Push if body
1554 pushBody(tree.thenpart, CoreType.FUNCTION_TYPE_VOID);
1555
1556 scan(tree.thenpart);
1557 appendTerminating(CoreOp::core_yield);
1558 bodies.add(stack.body);
1559
1560 // Pop if body
1561 popBody();
1562
1563 JCTree.JCStatement elsepart = tree.elsepart;
1564 if (elsepart == null) {
1565 tree = null;
1566 } else if (elsepart.getTag() == Tag.IF) {
1567 tree = (JCTree.JCIf) elsepart;
1568 } else {
1569 // Push else body
1570 pushBody(elsepart, CoreType.FUNCTION_TYPE_VOID);
1571
1572 scan(elsepart);
1573 appendTerminating(CoreOp::core_yield);
1574 bodies.add(stack.body);
1575
1576 // Pop else body
1577 popBody();
1578
1579 tree = null;
1580 }
1581 }
1582
1583 append(JavaOp.if_(bodies));
1584 result = null;
1585 }
1586
1587 @Override
1588 public void visitSwitchExpression(JCTree.JCSwitchExpression tree) {
1589 Value target = toValue(tree.selector);
1590
1591 Type switchType = adaptBottom(tree.type);
1592 FunctionType caseBodyType = CoreType.functionType(typeToTypeElement(switchType));
1593
1594 List<Body.Builder> bodies = visitSwitchStatAndExpr(tree, tree.selector, target, tree.cases, caseBodyType,
1595 !tree.hasUnconditionalPattern);
1596
1597 result = append(JavaOp.switchExpression(caseBodyType.returnType(), target, bodies));
1598 }
1599
1600 @Override
1601 public void visitSwitch(JCTree.JCSwitch tree) {
1602 Value target = toValue(tree.selector);
1603
1604 FunctionType actionType = CoreType.FUNCTION_TYPE_VOID;
1605
1606 List<Body.Builder> bodies = visitSwitchStatAndExpr(tree, tree.selector, target, tree.cases, actionType,
1607 tree.patternSwitch && !tree.hasUnconditionalPattern);
1608
1609 result = append(JavaOp.switchStatement(target, bodies));
1610 }
1611
1612 private List<Body.Builder> visitSwitchStatAndExpr(JCTree tree, JCExpression selector, Value target,
1613 List<JCTree.JCCase> cases, FunctionType caseBodyType,
1614 boolean isDefaultCaseNeeded) {
1615 List<Body.Builder> bodies = new ArrayList<>();
1616 Body.Builder defaultLabel = null;
1617 Body.Builder defaultBody = null;
1618
1619 for (JCTree.JCCase c : cases) {
1620 Body.Builder caseLabel = visitCaseLabel(tree, selector, target, c);
1621 Body.Builder caseBody = visitCaseBody(tree, c, caseBodyType);
1622
1623 if (c.labels.head instanceof JCTree.JCDefaultCaseLabel) {
1624 defaultLabel = caseLabel;
1625 defaultBody = caseBody;
1626 } else {
1627 bodies.add(caseLabel);
1628 bodies.add(caseBody);
1629 }
1630 }
1631
1632 if (defaultLabel != null) {
1633 bodies.add(defaultLabel);
1634 bodies.add(defaultBody);
1635 } else if (isDefaultCaseNeeded) {
1636 // label
1637 pushBody(tree, CoreType.functionType(JavaType.BOOLEAN));
1638 append(CoreOp.core_yield(append(CoreOp.constant(JavaType.BOOLEAN, true))));
1639 bodies.add(stack.body);
1640 popBody();
1641
1642 // body
1643 pushBody(tree, caseBodyType);
1644 append(JavaOp.throw_(
1645 append(JavaOp.new_(ConstructorRef.constructor(MatchException.class)))
1646 ));
1647 bodies.add(stack.body);
1648 popBody();
1649 }
1650
1651 return bodies;
1652 }
1653
1654 private Body.Builder visitCaseLabel(JCTree tree, JCExpression selector, Value target, JCTree.JCCase c) {
1655 Body.Builder body;
1656 FunctionType caseLabelType = CoreType.functionType(JavaType.BOOLEAN, target.type());
1657
1658 JCTree.JCCaseLabel headCl = c.labels.head;
1659 if (headCl instanceof JCTree.JCPatternCaseLabel pcl) {
1660 if (c.labels.size() > 1) {
1661 throw unsupported(c);
1662 }
1663
1664 pushBody(pcl, caseLabelType);
1665
1666 Value localTarget = stack.block.parameters().get(0);
1667 final Value localResult;
1668 if (c.guard != null) {
1669 List<Body.Builder> clBodies = new ArrayList<>();
1670
1671 pushBody(pcl.pat, CoreType.functionType(JavaType.BOOLEAN));
1672 Value patVal = scanPattern(pcl.pat, localTarget);
1673 append(CoreOp.core_yield(patVal));
1674 clBodies.add(stack.body);
1675 popBody();
1676
1677 pushBody(c.guard, CoreType.functionType(JavaType.BOOLEAN));
1678 append(CoreOp.core_yield(toValue(c.guard)));
1679 clBodies.add(stack.body);
1680 popBody();
1681
1682 localResult = append(JavaOp.conditionalAnd(clBodies));
1683 } else {
1684 localResult = scanPattern(pcl.pat, localTarget);
1685 }
1686 // Yield the boolean result of the condition
1687 append(CoreOp.core_yield(localResult));
1688 body = stack.body;
1689
1690 // Pop label
1691 popBody();
1692 } else if (headCl instanceof JCTree.JCConstantCaseLabel ccl) {
1693 pushBody(headCl, caseLabelType);
1694
1695 Value localTarget = stack.block.parameters().get(0);
1696 final Value localResult;
1697 if (c.labels.size() == 1) {
1698 Value expr = toValue(ccl.expr);
1699 // per java spec, constant type is compatible with the type of the selector expression
1700 // so, we convert constant to the type of the selector expression
1701 expr = convert(expr, selector.type);
1702 if (selector.type.isPrimitive()) {
1703 localResult = append(JavaOp.eq(localTarget, expr));
1704 } else {
1705 localResult = append(JavaOp.invoke(
1706 MethodRef.method(Objects.class, "equals", boolean.class, Object.class, Object.class),
1707 localTarget, expr));
1708 }
1709 } else {
1710 List<Body.Builder> clBodies = new ArrayList<>();
1711 for (JCTree.JCCaseLabel cl : c.labels) {
1712 ccl = (JCTree.JCConstantCaseLabel) cl;
1713 pushBody(ccl, CoreType.functionType(JavaType.BOOLEAN));
1714
1715 Value expr = toValue(ccl.expr);
1716 expr = convert(expr, selector.type);
1717 final Value labelResult;
1718 if (selector.type.isPrimitive()) {
1719 labelResult = append(JavaOp.eq(localTarget, expr));
1720 } else {
1721 labelResult = append(JavaOp.invoke(
1722 MethodRef.method(Objects.class, "equals", boolean.class, Object.class, Object.class),
1723 localTarget, expr));
1724 }
1725
1726 append(CoreOp.core_yield(labelResult));
1727 clBodies.add(stack.body);
1728
1729 // Pop label
1730 popBody();
1731 }
1732
1733 localResult = append(JavaOp.conditionalOr(clBodies));
1734 }
1735
1736 append(CoreOp.core_yield(localResult));
1737 body = stack.body;
1738
1739 // Pop labels
1740 popBody();
1741 } else if (headCl instanceof JCTree.JCDefaultCaseLabel) {
1742 // @@@ Do we need to model the default label body?
1743 pushBody(headCl, CoreType.functionType(JavaType.BOOLEAN));
1744
1745 append(CoreOp.core_yield(append(CoreOp.constant(JavaType.BOOLEAN, true))));
1746 body = stack.body;
1747
1748 // Pop label
1749 popBody();
1750 } else {
1751 throw unsupported(tree);
1752 }
1753
1754 return body;
1755 }
1756
1757 private Body.Builder visitCaseBody(JCTree tree, JCTree.JCCase c, FunctionType caseBodyType) {
1758 Body.Builder body = null;
1759 Type yieldType = tree.type != null ? adaptBottom(tree.type) : null;
1760
1761 JCTree.JCCaseLabel headCl = c.labels.head;
1762 switch (c.caseKind) {
1763 case RULE -> {
1764 pushBody(c.body, caseBodyType);
1765
1766 if (c.body instanceof JCTree.JCExpression e) {
1767 Value bodyVal = toValue(e, yieldType);
1768 append(CoreOp.core_yield(bodyVal));
1769 } else if (c.body instanceof JCTree.JCStatement s){ // this includes Block
1770 // Otherwise there is a yield statement
1771 Type prevBodyTarget = bodyTarget;
1772 try {
1773 bodyTarget = yieldType;
1774 toValue(s);
1775 } finally {
1776 bodyTarget = prevBodyTarget;
1777 }
1778 appendTerminating(c.completesNormally ? CoreOp::core_yield : CoreOp::unreachable);
1779 }
1780 body = stack.body;
1781
1782 // Pop block
1783 popBody();
1784 }
1785 case STATEMENT -> {
1786 // @@@ Avoid nesting for a single block? Goes against "say what you see"
1787 // boolean oneBlock = c.stats.size() == 1 && c.stats.head instanceof JCBlock;
1788 pushBody(c, caseBodyType);
1789
1790 scan(c.stats);
1791
1792 appendTerminating(c.completesNormally ?
1793 headCl instanceof JCTree.JCDefaultCaseLabel ? CoreOp::core_yield : JavaOp::switchFallthroughOp
1794 : CoreOp::unreachable);
1795
1796 body = stack.body;
1797
1798 // Pop block
1799 popBody();
1800 }
1801 }
1802 return body;
1803 }
1804
1805 @Override
1806 public void visitYield(JCTree.JCYield tree) {
1807 Value retVal = toValue(tree.value, bodyTarget);
1808 if (retVal == null) {
1809 result = append(JavaOp.java_yield());
1810 } else {
1811 result = append(JavaOp.java_yield(retVal));
1812 }
1813 }
1814
1815 @Override
1816 public void visitWhileLoop(JCTree.JCWhileLoop tree) {
1817 // @@@ Patterns
1818 JCTree.JCExpression cond = TreeInfo.skipParens(tree.cond);
1819
1820 // Push while condition
1821 pushBody(cond, CoreType.functionType(JavaType.BOOLEAN));
1822 Value last = toValue(cond);
1823 // Yield the boolean result of the condition
1824 last = convert(last, typeElementToType(JavaType.BOOLEAN));
1825 append(CoreOp.core_yield(last));
1826 Body.Builder condition = stack.body;
1827
1828 // Pop while condition
1829 popBody();
1830
1831 // Push while body
1832 pushBody(tree.body, CoreType.FUNCTION_TYPE_VOID);
1833 scan(tree.body);
1834 appendTerminating(JavaOp::continue_);
1835 Body.Builder body = stack.body;
1836
1837 // Pop while body
1838 popBody();
1839
1840 append(JavaOp.while_(condition, body));
1841 result = null;
1842 }
1843
1844 @Override
1845 public void visitDoLoop(JCTree.JCDoWhileLoop tree) {
1846 // @@@ Patterns
1847 JCTree.JCExpression cond = TreeInfo.skipParens(tree.cond);
1848
1849 // Push while body
1850 pushBody(tree.body, CoreType.FUNCTION_TYPE_VOID);
1851 scan(tree.body);
1852 appendTerminating(JavaOp::continue_);
1853 Body.Builder body = stack.body;
1854
1855 // Pop while body
1856 popBody();
1857
1858 // Push while condition
1859 pushBody(cond, CoreType.functionType(JavaType.BOOLEAN));
1860 Value last = toValue(cond);
1861 last = convert(last, typeElementToType(JavaType.BOOLEAN));
1862 // Yield the boolean result of the condition
1863 append(CoreOp.core_yield(last));
1864 Body.Builder condition = stack.body;
1865
1866 // Pop while condition
1867 popBody();
1868
1869 append(JavaOp.doWhile(body, condition));
1870 result = null;
1871 }
1872
1873 @Override
1874 public void visitForeachLoop(JCTree.JCEnhancedForLoop tree) {
1875 // Push expression
1876 pushBody(tree.expr, CoreType.functionType(typeToTypeElement(tree.expr.type)));
1877 Value last = toValue(tree.expr);
1878 // Yield the Iterable result of the expression
1879 append(CoreOp.core_yield(last));
1880 Body.Builder expression = stack.body;
1881
1882 // Pop expression
1883 popBody();
1884
1885 JCVariableDecl var = tree.getVariable();
1886 JavaType eType = typeToTypeElement(var.type);
1887 VarType varEType = CoreType.varType(typeToTypeElement(var.type));
1888
1889 // Push init
1890 // @@@ When lhs assignment is a pattern we embed the pattern match into the init body and
1891 // return the bound variables
1892 pushBody(var, CoreType.functionType(varEType, eType));
1893 Op.Result varEResult = append(CoreOp.var(var.name.toString(), stack.block.parameters().get(0)));
1894 append(CoreOp.core_yield(varEResult));
1895 Body.Builder init = stack.body;
1896 // Pop init
1897 popBody();
1898
1899 // Push body
1900 pushBody(tree.body, CoreType.functionType(JavaType.VOID, varEType));
1901 stack.localToOp.put(var.sym, stack.block.parameters().get(0));
1902
1903 scan(tree.body);
1904 appendTerminating(JavaOp::continue_);
1905 Body.Builder body = stack.body;
1906 // Pop body
1907 popBody();
1908
1909 append(JavaOp.enhancedFor(expression, init, body));
1910 result = null;
1911 }
1912
1913 @Override
1914 public void visitForLoop(JCTree.JCForLoop tree) {
1915 class VarDefScanner extends FilterScanner {
1916 final List<JCVariableDecl> decls;
1917
1918 public VarDefScanner() {
1919 super(Set.of(Tag.VARDEF));
1920 this.decls = new ArrayList<>();
1921 }
1922
1923 @Override
1924 public void visitVarDef(JCVariableDecl tree) {
1925 decls.add(tree);
1926 }
1927
1928 void mapVarsToBlockArguments() {
1929 for (int i = 0; i < decls.size(); i++) {
1930 stack.localToOp.put(decls.get(i).sym, stack.block.parameters().get(i));
1931 }
1932 }
1933
1934 List<VarType> varTypes() {
1935 return decls.stream()
1936 .map(t -> CoreType.varType(typeToTypeElement(t.type)))
1937 .toList();
1938 }
1939
1940 List<Value> varValues() {
1941 return decls.stream()
1942 .map(t -> stack.localToOp.get(t.sym))
1943 .toList();
1944 }
1945 }
1946
1947 // Scan local variable declarations
1948 VarDefScanner vds = new VarDefScanner();
1949 vds.scan(tree.init);
1950 List<VarType> varTypes = vds.varTypes();
1951
1952 // Push init
1953 if (varTypes.size() > 1) {
1954 pushBody(null, CoreType.functionType(CoreType.tupleType(varTypes)));
1955 scan(tree.init);
1956
1957 // Capture all local variable declarations in tuple
1958 append(CoreOp.core_yield(append(CoreOp.tuple(vds.varValues()))));
1959 } else if (varTypes.size() == 1) {
1960 pushBody(null, CoreType.functionType(varTypes.get(0)));
1961 scan(tree.init);
1962
1963 append(CoreOp.core_yield(vds.varValues().get(0)));
1964 } else {
1965 pushBody(null, CoreType.FUNCTION_TYPE_VOID);
1966 scan(tree.init);
1967
1968 append(CoreOp.core_yield());
1969 }
1970 Body.Builder init = stack.body;
1971
1972 // Pop init
1973 popBody();
1974
1975 // Push cond
1976 pushBody(tree.cond, CoreType.functionType(JavaType.BOOLEAN, varTypes));
1977 if (tree.cond != null) {
1978 vds.mapVarsToBlockArguments();
1979
1980 Value last = toValue(tree.cond);
1981 // Yield the boolean result of the condition
1982 append(CoreOp.core_yield(last));
1983 } else {
1984 append(CoreOp.core_yield(append(CoreOp.constant(JavaType.BOOLEAN, true))));
1985 }
1986 Body.Builder cond = stack.body;
1987
1988 // Pop cond
1989 popBody();
1990
1991 // Push update
1992 // @@@ tree.step is a List<JCStatement>
1993 pushBody(null, CoreType.functionType(JavaType.VOID, varTypes));
1994 if (!tree.step.isEmpty()) {
1995 vds.mapVarsToBlockArguments();
1996
1997 scan(tree.step);
1998 }
1999 append(CoreOp.core_yield());
2000 Body.Builder update = stack.body;
2001
2002 // Pop update
2003 popBody();
2004
2005 // Push body
2006 pushBody(tree.body, CoreType.functionType(JavaType.VOID, varTypes));
2007 if (tree.body != null) {
2008 vds.mapVarsToBlockArguments();
2009
2010 scan(tree.body);
2011 }
2012 appendTerminating(JavaOp::continue_);
2013 Body.Builder body = stack.body;
2014
2015 // Pop update
2016 popBody();
2017
2018 append(JavaOp.for_(init, cond, update, body));
2019 result = null;
2020 }
2021
2022 @Override
2023 public void visitConditional(JCTree.JCConditional tree) {
2024 List<Body.Builder> bodies = new ArrayList<>();
2025
2026 JCTree.JCExpression cond = TreeInfo.skipParens(tree.cond);
2027
2028 // Push condition
2029 pushBody(cond,
2030 CoreType.functionType(JavaType.BOOLEAN));
2031 Value condVal = toValue(cond);
2032 // Yield the boolean result of the condition
2033 append(CoreOp.core_yield(condVal));
2034 bodies.add(stack.body);
2035
2036 // Pop condition
2037 popBody();
2038
2039 JCTree.JCExpression truepart = TreeInfo.skipParens(tree.truepart);
2040
2041 Type condType = adaptBottom(tree.type);
2042
2043 // Push true body
2044 pushBody(truepart,
2045 CoreType.functionType(typeToTypeElement(condType)));
2046
2047 Value trueVal = toValue(truepart, condType);
2048 // Yield the result
2049 append(CoreOp.core_yield(trueVal));
2050 bodies.add(stack.body);
2051
2052 // Pop true body
2053 popBody();
2054
2055 JCTree.JCExpression falsepart = TreeInfo.skipParens(tree.falsepart);
2056
2057 // Push false body
2058 pushBody(falsepart,
2059 CoreType.functionType(typeToTypeElement(condType)));
2060
2061 Value falseVal = toValue(falsepart, condType);
2062 // Yield the result
2063 append(CoreOp.core_yield(falseVal));
2064 bodies.add(stack.body);
2065
2066 // Pop false body
2067 popBody();
2068
2069 result = append(JavaOp.conditionalExpression(typeToTypeElement(condType), bodies));
2070 }
2071
2072 private Type condType(JCExpression tree, Type type) {
2073 if (type.hasTag(BOT)) {
2074 return adaptBottom(tree.type);
2075 } else {
2076 return type;
2077 }
2078 }
2079
2080 private Type adaptBottom(Type type) {
2081 return type.hasTag(BOT) ?
2082 (pt.hasTag(NONE) ? syms.objectType : pt) :
2083 type;
2084 }
2085
2086 @Override
2087 public void visitAssert(JCAssert tree) {
2088 // assert <cond:body1> [detail:body2]
2089
2090 List<Body.Builder> bodies = new ArrayList<>();
2091 JCTree.JCExpression cond = TreeInfo.skipParens(tree.cond);
2092
2093 // Push condition
2094 pushBody(cond,
2095 CoreType.functionType(JavaType.BOOLEAN));
2096 Value condVal = toValue(cond);
2097
2098 // Yield the boolean result of the condition
2099 append(CoreOp.core_yield(condVal));
2100 bodies.add(stack.body);
2101
2102 // Pop condition
2103 popBody();
2104
2105 if (tree.detail != null) {
2106 JCTree.JCExpression detail = TreeInfo.skipParens(tree.detail);
2107
2108 pushBody(detail,
2109 CoreType.functionType(typeToTypeElement(tree.detail.type)));
2110 Value detailVal = toValue(detail);
2111
2112 append(CoreOp.core_yield(detailVal));
2113 bodies.add(stack.body);
2114
2115 //Pop detail
2116 popBody();
2117 }
2118
2119 result = append(JavaOp.assert_(bodies));
2120
2121 }
2122
2123 @Override
2124 public void visitBlock(JCTree.JCBlock tree) {
2125 if (stack.tree == tree) {
2126 // Block is associated with the visit of a parent structure
2127 scan(tree.stats);
2128 } else {
2129 // Otherwise, independent block structure
2130 // Push block
2131 pushBody(tree, CoreType.FUNCTION_TYPE_VOID);
2132 scan(tree.stats);
2133 appendTerminating(CoreOp::core_yield);
2134 Body.Builder body = stack.body;
2135
2136 // Pop block
2137 popBody();
2138
2139 append(JavaOp.block(body));
2140 }
2141 result = null;
2142 }
2143
2144 @Override
2145 public void visitSynchronized(JCTree.JCSynchronized tree) {
2146 // Push expr
2147 pushBody(tree.lock, CoreType.functionType(typeToTypeElement(tree.lock.type)));
2148 Value last = toValue(tree.lock);
2149 append(CoreOp.core_yield(last));
2150 Body.Builder expr = stack.body;
2151
2152 // Pop expr
2153 popBody();
2154
2155 // Push body block
2156 pushBody(tree.body, CoreType.FUNCTION_TYPE_VOID);
2157 // Scan body block statements
2158 scan(tree.body.stats);
2159 appendTerminating(CoreOp::core_yield);
2160 Body.Builder blockBody = stack.body;
2161
2162 // Pop body block
2163 popBody();
2164
2165 append(JavaOp.synchronized_(expr, blockBody));
2166 }
2167
2168 @Override
2169 public void visitLabelled(JCTree.JCLabeledStatement tree) {
2170 // Push block
2171 pushBody(tree, CoreType.FUNCTION_TYPE_VOID);
2172 // Create constant for label
2173 String labelName = tree.label.toString();
2174 Op.Result label = append(CoreOp.constant(JavaType.J_L_STRING, labelName));
2175 // Set label on body stack
2176 stack.setLabel(labelName, label);
2177 scan(tree.body);
2178 appendTerminating(CoreOp::core_yield);
2179 Body.Builder body = stack.body;
2180
2181 // Pop block
2182 popBody();
2183
2184 result = append(JavaOp.labeled(body));
2185 }
2186
2187 @Override
2188 public void visitTry(JCTree.JCTry tree) {
2189 List<JCVariableDecl> rVariableDecls = new ArrayList<>();
2190 List<TypeElement> rTypes = new ArrayList<>();
2191 Body.Builder resources;
2192 if (!tree.resources.isEmpty()) {
2193 // Resources body returns a tuple that contains the resource variables/values
2194 // in order of declaration
2195 for (JCTree resource : tree.resources) {
2196 if (resource instanceof JCVariableDecl vdecl) {
2197 rVariableDecls.add(vdecl);
2198 rTypes.add(CoreType.varType(typeToTypeElement(vdecl.type)));
2199 } else {
2200 rTypes.add(typeToTypeElement(resource.type));
2201 }
2202 }
2203
2204 // Push resources body
2205 pushBody(null, CoreType.functionType(CoreType.tupleType(rTypes)));
2206
2207 List<Value> rValues = new ArrayList<>();
2208 for (JCTree resource : tree.resources) {
2209 if (resource instanceof JCTree.JCExpression e) {
2210 rValues.add(toValue(e));
2211 } else if (resource instanceof JCTree.JCStatement s) {
2212 rValues.add(toValue(s));
2213 }
2214 }
2215
2216 append(CoreOp.core_yield(append(CoreOp.tuple(rValues))));
2217 resources = stack.body;
2218
2219 // Pop resources body
2220 popBody();
2221 } else {
2222 resources = null;
2223 }
2224
2225 // Push body
2226 // Try body accepts the resource variables (in order of declaration).
2227 List<VarType> rVarTypes = rTypes.stream().<VarType>mapMulti((t, c) -> {
2228 if (t instanceof VarType vt) {
2229 c.accept(vt);
2230 }
2231 }).toList();
2232 pushBody(tree.body, CoreType.functionType(JavaType.VOID, rVarTypes));
2233 for (int i = 0; i < rVariableDecls.size(); i++) {
2234 stack.localToOp.put(rVariableDecls.get(i).sym, stack.block.parameters().get(i));
2235 }
2236 scan(tree.body);
2237 appendTerminating(CoreOp::core_yield);
2238 Body.Builder body = stack.body;
2239
2240 // Pop block
2241 popBody();
2242
2243 List<Body.Builder> catchers = new ArrayList<>();
2244 for (JCTree.JCCatch catcher : tree.catchers) {
2245 // Push body
2246 pushBody(catcher.body, CoreType.functionType(JavaType.VOID, typeToTypeElement(catcher.param.type)));
2247 Op.Result exVariable = append(CoreOp.var(
2248 catcher.param.name.toString(),
2249 stack.block.parameters().get(0)));
2250 stack.localToOp.put(catcher.param.sym, exVariable);
2251 scan(catcher.body);
2252 appendTerminating(CoreOp::core_yield);
2253 catchers.add(stack.body);
2254
2255 // Pop block
2256 popBody();
2257 }
2258
2259 Body.Builder finalizer;
2260 if (tree.finalizer != null) {
2261 // Push body
2262 pushBody(tree.finalizer, CoreType.FUNCTION_TYPE_VOID);
2263 scan(tree.finalizer);
2264 appendTerminating(CoreOp::core_yield);
2265 finalizer = stack.body;
2266
2267 // Pop block
2268 popBody();
2269 }
2270 else {
2271 finalizer = null;
2272 }
2273
2274 result = append(JavaOp.try_(resources, body, catchers, finalizer));
2275 }
2276
2277 @Override
2278 public void visitUnary(JCTree.JCUnary tree) {
2279 Tag tag = tree.getTag();
2280 switch (tag) {
2281 case POSTINC, POSTDEC, PREINC, PREDEC -> {
2282 // Capture applying rhs and operation
2283 Function<Value, Value> scanRhs = (lhs) -> {
2284 Type unboxedType = types.unboxedTypeOrType(tree.type);
2285 Value one = convert(append(numericOneValue(unboxedType)), unboxedType);
2286 Value unboxedLhs = unboxIfNeeded(lhs);
2287
2288 Value unboxedLhsPlusOne = switch (tree.getTag()) {
2289 // Arithmetic operations
2290 case POSTINC, PREINC -> append(JavaOp.add(unboxedLhs, one));
2291 case POSTDEC, PREDEC -> append(JavaOp.sub(unboxedLhs, one));
2292
2293 default -> throw unsupported(tree);
2294 };
2295 Value lhsPlusOne = convert(unboxedLhsPlusOne, tree.type);
2296
2297 // Assign expression result
2298 result = switch (tree.getTag()) {
2299 case POSTINC, POSTDEC -> lhs;
2300 case PREINC, PREDEC -> lhsPlusOne;
2301
2302 default -> throw unsupported(tree);
2303 };
2304 return lhsPlusOne;
2305 };
2306
2307 applyCompoundAssign(tree.arg, scanRhs);
2308 }
2309 case NEG -> {
2310 Value rhs = toValue(tree.arg, tree.type);
2311 result = append(JavaOp.neg(rhs));
2312 }
2313 case NOT -> {
2314 Value rhs = toValue(tree.arg, tree.type);
2315 result = append(JavaOp.not(rhs));
2316 }
2317 case COMPL -> {
2318 Value rhs = toValue(tree.arg, tree.type);
2319 result = append(JavaOp.compl(rhs));
2320 }
2321 case POS -> {
2322 // Result is value of the operand
2323 result = toValue(tree.arg, tree.type);
2324 }
2325 default -> throw unsupported(tree);
2326 }
2327 }
2328
2329 @Override
2330 public void visitBinary(JCBinary tree) {
2331 Tag tag = tree.getTag();
2332 if (tag == Tag.AND || tag == Tag.OR) {
2333 // Logical operations
2334 // @@@ Flatten nested sequences
2335
2336 // Push lhs
2337 pushBody(tree.lhs, CoreType.functionType(JavaType.BOOLEAN));
2338 Value lhs = toValue(tree.lhs);
2339 // Yield the boolean result of the condition
2340 append(CoreOp.core_yield(lhs));
2341 Body.Builder bodyLhs = stack.body;
2342
2343 // Pop lhs
2344 popBody();
2345
2346 // Push rhs
2347 pushBody(tree.rhs, CoreType.functionType(JavaType.BOOLEAN));
2348 Value rhs = toValue(tree.rhs);
2349 // Yield the boolean result of the condition
2350 append(CoreOp.core_yield(rhs));
2351 Body.Builder bodyRhs = stack.body;
2352
2353 // Pop lhs
2354 popBody();
2355
2356 List<Body.Builder> bodies = List.of(bodyLhs, bodyRhs);
2357 result = append(tag == Tag.AND
2358 ? JavaOp.conditionalAnd(bodies)
2359 : JavaOp.conditionalOr(bodies));
2360 } else if (tag == Tag.PLUS && tree.operator.opcode == ByteCodes.string_add) {
2361 //Ignore the operator and query both subexpressions for their type with concats
2362 Type lhsType = tree.lhs.type;
2363 Type rhsType = tree.rhs.type;
2364
2365 Value lhs = toValue(tree.lhs, lhsType);
2366 Value rhs = toValue(tree.rhs, rhsType);
2367
2368 result = append(JavaOp.concat(lhs, rhs));
2369 }
2370 else {
2371 Type opType = tree.operator.type.getParameterTypes().getFirst();
2372 // @@@ potentially handle shift input conversion like other binary ops
2373 boolean isShift = tag == Tag.SL || tag == Tag.SR || tag == Tag.USR;
2374 Value lhs = toValue(tree.lhs, opType);
2375 Value rhs = toValue(tree.rhs, isShift ? tree.operator.type.getParameterTypes().getLast() : opType);
2376
2377 result = switch (tag) {
2378 // Arithmetic operations
2379 case PLUS -> append(JavaOp.add(lhs, rhs));
2380 case MINUS -> append(JavaOp.sub(lhs, rhs));
2381 case MUL -> append(JavaOp.mul(lhs, rhs));
2382 case DIV -> append(JavaOp.div(lhs, rhs));
2383 case MOD -> append(JavaOp.mod(lhs, rhs));
2384
2385 // Test operations
2386 case EQ -> append(JavaOp.eq(lhs, rhs));
2387 case NE -> append(JavaOp.neq(lhs, rhs));
2388 //
2389 case LT -> append(JavaOp.lt(lhs, rhs));
2390 case LE -> append(JavaOp.le(lhs, rhs));
2391 case GT -> append(JavaOp.gt(lhs, rhs));
2392 case GE -> append(JavaOp.ge(lhs, rhs));
2393
2394 // Bitwise operations (including their boolean variants)
2395 case BITOR -> append(JavaOp.or(lhs, rhs));
2396 case BITAND -> append(JavaOp.and(lhs, rhs));
2397 case BITXOR -> append(JavaOp.xor(lhs, rhs));
2398
2399 // Shift operations
2400 case SL -> append(JavaOp.lshl(lhs, rhs));
2401 case SR -> append(JavaOp.ashr(lhs, rhs));
2402 case USR -> append(JavaOp.lshr(lhs, rhs));
2403
2404 default -> throw unsupported(tree);
2405 };
2406 }
2407 }
2408
2409 @Override
2410 public void visitLiteral(JCLiteral tree) {
2411 Object value = switch (tree.type.getTag()) {
2412 case BOOLEAN -> tree.value instanceof Integer i && i == 1;
2413 case CHAR -> (char) (int) tree.value;
2414 default -> tree.value;
2415 };
2416 Type constantType = adaptBottom(tree.type);
2417 result = append(CoreOp.constant(typeToTypeElement(constantType), value));
2418 }
2419
2420 @Override
2421 public void visitReturn(JCReturn tree) {
2422 Value retVal = toValue(tree.expr, bodyTarget);
2423 if (retVal == null) {
2424 result = append(CoreOp.return_());
2425 } else {
2426 result = append(CoreOp.return_(retVal));
2427 }
2428 }
2429
2430 @Override
2431 public void visitThrow(JCTree.JCThrow tree) {
2432 Value throwVal = toValue(tree.expr);
2433 result = append(JavaOp.throw_(throwVal));
2434 }
2435
2436 @Override
2437 public void visitBreak(JCTree.JCBreak tree) {
2438 Value label = tree.label != null
2439 ? getLabel(tree.label.toString())
2440 : null;
2441 result = append(JavaOp.break_(label));
2442 }
2443
2444 @Override
2445 public void visitContinue(JCTree.JCContinue tree) {
2446 Value label = tree.label != null
2447 ? getLabel(tree.label.toString())
2448 : null;
2449 result = append(JavaOp.continue_(label));
2450 }
2451
2452 @Override
2453 public void visitClassDef(JCClassDecl tree) {
2454 if (tree.sym.isDirectlyOrIndirectlyLocal()) {
2455 // we need to keep track of captured locals using same strategy as Lower
2456 class FreeVarScanner extends Lower.FreeVarCollector {
2457 FreeVarScanner() {
2458 lower.super(tree);
2459 }
2460
2461 @Override
2462 protected void addFreeVars(ClassSymbol c) {
2463 localCaptures.getOrDefault(c, List.of())
2464 .forEach(s -> addFreeVar((VarSymbol)s));
2465 }
2466 }
2467 FreeVarScanner fvs = new FreeVarScanner();
2468 localCaptures.put(tree.sym, List.copyOf(fvs.analyzeCaptures()));
2469 }
2470 }
2471
2472 UnsupportedASTException unsupported(JCTree tree) {
2473 return new UnsupportedASTException(tree);
2474 }
2475
2476 CoreOp.FuncOp scanMethod() {
2477 scan(body);
2478 appendReturnOrUnreachable(body);
2479 CoreOp.FuncOp func = CoreOp.func(name.toString(), stack.body);
2480 func.setLocation(generateLocation(currentNode, true));
2481 return func;
2482 }
2483
2484 CoreOp.FuncOp scanLambda() {
2485 scan(body);
2486 // Return the quoted result
2487 append(CoreOp.return_(result));
2488 return CoreOp.func(name.toString(), stack.body);
2489 }
2490
2491 Op defaultValue(Type t) {
2492 return switch (t.getTag()) {
2493 case BYTE, SHORT, INT -> CoreOp.constant(JavaType.INT, 0);
2494 case CHAR -> CoreOp.constant(typeToTypeElement(t), (char)0);
2495 case BOOLEAN -> CoreOp.constant(typeToTypeElement(t), false);
2496 case FLOAT -> CoreOp.constant(typeToTypeElement(t), 0f);
2497 case LONG -> CoreOp.constant(typeToTypeElement(t), 0L);
2498 case DOUBLE -> CoreOp.constant(typeToTypeElement(t), 0d);
2499 default -> CoreOp.constant(typeToTypeElement(t), null);
2500 };
2501 }
2502
2503 Op numericOneValue(Type t) {
2504 return switch (t.getTag()) {
2505 case BYTE, SHORT, INT -> CoreOp.constant(JavaType.INT, 1);
2506 case CHAR -> CoreOp.constant(typeToTypeElement(t), (char)1);
2507 case FLOAT -> CoreOp.constant(typeToTypeElement(t), 1f);
2508 case LONG -> CoreOp.constant(typeToTypeElement(t), 1L);
2509 case DOUBLE -> CoreOp.constant(typeToTypeElement(t), 1d);
2510 default -> throw new UnsupportedOperationException(t.toString());
2511 };
2512 }
2513 }
2514
2515 /**
2516 * An exception thrown when an unsupported AST node is found when building a method IR.
2517 */
2518 static class UnsupportedASTException extends RuntimeException {
2519
2520 private static final long serialVersionUID = 0;
2521 transient final JCTree tree;
2522
2523 public UnsupportedASTException(JCTree tree) {
2524 this.tree = tree;
2525 }
2526 }
2527
2528 enum FunctionalExpressionKind {
2529 QUOTED_STRUCTURAL(true), // this is transitional
2530 QUOTABLE(true),
2531 NOT_QUOTED(false);
2532
2533 final boolean isQuoted;
2534
2535 FunctionalExpressionKind(boolean isQuoted) {
2536 this.isQuoted = isQuoted;
2537 }
2538 }
2539
2540 FunctionalExpressionKind functionalKind(JCFunctionalExpression functionalExpression) {
2541 if (functionalExpression.target.hasTag(TypeTag.METHOD)) {
2542 return FunctionalExpressionKind.QUOTED_STRUCTURAL;
2543 } else if (types.asSuper(functionalExpression.target, crSyms.quotableType.tsym) != null) {
2544 return FunctionalExpressionKind.QUOTABLE;
2545 } else {
2546 return FunctionalExpressionKind.NOT_QUOTED;
2547 }
2548 }
2549
2550 /*
2551 * Converts a method reference which cannot be used directly into a lambda.
2552 * This code has been derived from LambdaToMethod::MemberReferenceToLambda. The main
2553 * difference is that, while that code concerns with translation strategy, boxing
2554 * conversion and type erasure, this version does not and, as such, can remain
2555 * at a higher level. Note that this code needs to create a synthetic variable
2556 * declaration in case of a bounded method reference whose receiver expression
2557 * is other than 'this'/'super' (this is done to prevent the receiver expression
2558 * from being computed twice).
2559 */
2560 private class MemberReferenceToLambda {
2561
2562 private final JCMemberReference tree;
2563 private final Symbol owner;
2564 private final ListBuffer<JCExpression> args = new ListBuffer<>();
2565 private final ListBuffer<JCVariableDecl> params = new ListBuffer<>();
2566 private JCVariableDecl receiverVar = null;
2567
2568 MemberReferenceToLambda(JCMemberReference tree, Symbol currentClass) {
2569 this.tree = tree;
2570 this.owner = new MethodSymbol(0, names.lambda, tree.target, currentClass);
2571 if (tree.kind == ReferenceKind.BOUND && !isThisOrSuper(tree.getQualifierExpression())) {
2572 // true bound method reference, hoist receiver expression out
2573 Type recvType = types.asSuper(tree.getQualifierExpression().type, tree.sym.owner);
2574 VarSymbol vsym = makeSyntheticVar("rec$", recvType);
2575 receiverVar = make.VarDef(vsym, tree.getQualifierExpression());
2576 }
2577 }
2578
2579 JCVariableDecl receiverVar() {
2580 return receiverVar;
2581 }
2582
2583 JCLambda lambda() {
2584 int prevPos = make.pos;
2585 try {
2586 make.at(tree);
2587
2588 //body generation - this can be either a method call or a
2589 //new instance creation expression, depending on the member reference kind
2590 VarSymbol rcvr = addParametersReturnReceiver();
2591 JCExpression expr = (tree.getMode() == ReferenceMode.INVOKE)
2592 ? expressionInvoke(rcvr)
2593 : expressionNew();
2594
2595 JCLambda slam = make.Lambda(params.toList(), expr);
2596 slam.target = tree.target;
2597 slam.type = tree.type;
2598 slam.pos = tree.pos;
2599 return slam;
2600 } finally {
2601 make.at(prevPos);
2602 }
2603 }
2604
2605 /**
2606 * Generate the parameter list for the converted member reference.
2607 *
2608 * @return The receiver variable symbol, if any
2609 */
2610 VarSymbol addParametersReturnReceiver() {
2611 com.sun.tools.javac.util.List<Type> descPTypes = tree.getDescriptorType(types).getParameterTypes();
2612 VarSymbol receiverParam = null;
2613 switch (tree.kind) {
2614 case BOUND:
2615 if (receiverVar != null) {
2616 receiverParam = receiverVar.sym;
2617 }
2618 break;
2619 case UNBOUND:
2620 // The receiver is the first parameter, extract it and
2621 // adjust the SAM and unerased type lists accordingly
2622 receiverParam = addParameter("rec$", descPTypes.head, false);
2623 descPTypes = descPTypes.tail;
2624 break;
2625 }
2626 for (int i = 0; descPTypes.nonEmpty(); ++i) {
2627 // By default use the implementation method parameter type
2628 Type parmType = descPTypes.head;
2629 addParameter("x$" + i, parmType, true);
2630
2631 // Advance to the next parameter
2632 descPTypes = descPTypes.tail;
2633 }
2634
2635 return receiverParam;
2636 }
2637
2638 /**
2639 * determine the receiver of the method call - the receiver can
2640 * be a type qualifier, the synthetic receiver parameter or 'super'.
2641 */
2642 private JCExpression expressionInvoke(VarSymbol receiverParam) {
2643 JCExpression qualifier = receiverParam != null ?
2644 make.at(tree.pos).Ident(receiverParam) :
2645 tree.getQualifierExpression();
2646
2647 //create the qualifier expression
2648 JCFieldAccess select = make.Select(qualifier, tree.sym.name);
2649 select.sym = tree.sym;
2650 select.type = tree.referentType;
2651
2652 //create the method call expression
2653 JCMethodInvocation apply = make.Apply(com.sun.tools.javac.util.List.nil(), select, args.toList()).
2654 setType(tree.referentType.getReturnType());
2655
2656 apply.varargsElement = tree.varargsElement;
2657 return apply;
2658 }
2659
2660 /**
2661 * Lambda body to use for a 'new'.
2662 */
2663 private JCExpression expressionNew() {
2664 Type expectedType = tree.referentType.getReturnType().hasTag(TypeTag.VOID) ?
2665 tree.expr.type : tree.referentType.getReturnType();
2666 if (tree.kind == ReferenceKind.ARRAY_CTOR) {
2667 //create the array creation expression
2668 JCNewArray newArr = make.NewArray(
2669 make.Type(types.elemtype(expectedType)),
2670 com.sun.tools.javac.util.List.of(make.Ident(params.first())),
2671 null);
2672 newArr.type = tree.getQualifierExpression().type;
2673 return newArr;
2674 } else {
2675 //create the instance creation expression
2676 //note that method reference syntax does not allow an explicit
2677 //enclosing class (so the enclosing class is null)
2678 // but this may need to be patched up later with the proxy for the outer this
2679 JCExpression newType = make.Type(types.erasure(expectedType));
2680 if (expectedType.tsym.type.getTypeArguments().nonEmpty()) {
2681 newType = make.TypeApply(newType, com.sun.tools.javac.util.List.nil());
2682 }
2683 JCNewClass newClass = make.NewClass(null,
2684 com.sun.tools.javac.util.List.nil(),
2685 newType,
2686 args.toList(),
2687 null);
2688 newClass.constructor = tree.sym;
2689 newClass.constructorType = tree.referentType;
2690 newClass.type = expectedType;
2691 newClass.varargsElement = tree.varargsElement;
2692 return newClass;
2693 }
2694 }
2695
2696 private VarSymbol makeSyntheticVar(String name, Type type) {
2697 VarSymbol vsym = new VarSymbol(PARAMETER | SYNTHETIC, names.fromString(name), type, owner);
2698 vsym.pos = tree.pos;
2699 return vsym;
2700 }
2701
2702 private VarSymbol addParameter(String name, Type type, boolean genArg) {
2703 VarSymbol vsym = makeSyntheticVar(name, type);
2704 params.append(make.VarDef(vsym, null));
2705 if (genArg) {
2706 args.append(make.Ident(vsym));
2707 }
2708 return vsym;
2709 }
2710
2711 boolean isThisOrSuper(JCExpression expression) {
2712 return TreeInfo.isThisQualifier(expression) || TreeInfo.isSuperQualifier(tree);
2713 }
2714 }
2715
2716 public static class Provider implements CodeReflectionTransformer {
2717 @Override
2718 public JCTree translateTopLevelClass(Context context, JCTree tree, TreeMaker make) {
2719 return ReflectMethods.instance(context).translateTopLevelClass(tree, make);
2720 }
2721 }
2722
2723 /**
2724 * Translate a code model (a function op) into the corresponding AST.
2725 * The input function op is assumed to be generated by {@code OpBuilder}.
2726 */
2727 class CodeModelTranslator {
2728 private static final MethodRef M_BLOCK_BUILDER_OP = MethodRef.method(Block.Builder.class, "op",
2729 Op.Result.class, Op.class);
2730 private static final MethodRef M_BLOCK_BUILDER_PARAM = MethodRef.method(Block.Builder.class, "parameter",
2731 Block.Parameter.class, TypeElement.class);
2732
2733 private final Map<Value, JCTree> valueToTree = new HashMap<>();
2734 private int localVarCount = 0; // used to name variables we introduce in the AST
2735
2736 private JCExpression toExpr(JCTree t) {
2737 return switch (t) {
2738 case JCExpression e -> e;
2739 case JCTree.JCVariableDecl vd -> make.Ident(vd);
2740 case null, default -> throw new IllegalArgumentException();
2741 };
2742 }
2743
2744 private JCTree translateInvokeOp(JavaOp.InvokeOp invokeOp) {
2745 Value receiver = (invokeOp.invokeKind() == JavaOp.InvokeOp.InvokeKind.INSTANCE) ?
2746 invokeOp.operands().get(0) : null;
2747 com.sun.tools.javac.util.List<Value> arguments = invokeOp.operands().stream()
2748 .skip(receiver == null ? 0 : 1)
2749 .collect(com.sun.tools.javac.util.List.collector());
2750 var methodSym = methodDescriptorToSymbol(invokeOp.invokeDescriptor());
2751 var meth = (receiver == null) ?
2752 make.Ident(methodSym) :
2753 make.Select(toExpr(translateOp(receiver)), methodSym);
2754 var args = new ListBuffer<JCTree.JCExpression>();
2755 for (Value operand : arguments) {
2756 args.add(toExpr(translateOp(operand)));
2757 }
2758 var methodInvocation = make.App(meth, args.toList());
2759 if (invokeOp.isVarArgs()) {
2760 setVarargs(methodInvocation, invokeOp.invokeDescriptor().type());
2761 }
2762 return methodInvocation;
2763 }
2764
2765 private void setVarargs(JCExpression tree, FunctionType type) {
2766 var lastParam = type.parameterTypes().getLast();
2767 if (lastParam instanceof jdk.incubator.code.dialect.java.ArrayType varargType) {
2768 TreeInfo.setVarargsElement(tree, typeElementToType(varargType.componentType()));
2769 } else {
2770 Assert.error("Expected trailing array type: " + type);
2771 }
2772 }
2773
2774 public JCTree.JCStatement translateFuncOp(CoreOp.FuncOp funcOp, MethodSymbol ms) {
2775 Assert.check(funcOp.parameters().isEmpty());
2776 Assert.check(funcOp.body().blocks().size() == 1);
2777
2778 java.util.List<Value> rootValues = funcOp.traverse(new ArrayList<>(), (l, ce) -> {
2779 boolean isRoot = switch (ce) {
2780 case JavaOp.InvokeOp invokeOp when invokeOp.invokeDescriptor().equals(M_BLOCK_BUILDER_OP)
2781 || invokeOp.invokeDescriptor().equals(M_BLOCK_BUILDER_PARAM) -> true;
2782 case CoreOp.ReturnOp _, JavaOp.ArrayAccessOp.ArrayStoreOp _ -> true;
2783 case Op op when op.result() != null && op.result().uses().size() > 1 -> true;
2784 default -> false;
2785 };
2786 if (isRoot) {
2787 l.add(((Op) ce).result());
2788 }
2789 return l;
2790 });
2791
2792 var stats = new ListBuffer<JCTree.JCStatement>();
2793 for (Value root : rootValues) {
2794 JCTree tree = translateOp(root);
2795 if (tree instanceof JCExpression e) {
2796 if (!root.uses().isEmpty()) {
2797 var vs = new Symbol.VarSymbol(LocalVarFlags | SYNTHETIC, names.fromString("_$" + localVarCount++), tree.type, ms);
2798 tree = make.VarDef(vs, e);
2799 valueToTree.put(root, tree);
2800 } else {
2801 tree = make.Exec(e);
2802 }
2803 }
2804 stats.add((JCTree.JCStatement) tree);
2805 }
2806 var mb = make.Block(0, stats.toList());
2807
2808 return mb;
2809 }
2810
2811 private JCTree translateOp(Value v) {
2812 if (valueToTree.containsKey(v)) {
2813 return valueToTree.get(v);
2814 }
2815 Op op = ((Op.Result) v).op();
2816 JCTree tree = switch (op) {
2817 case CoreOp.ConstantOp constantOp when constantOp.value() == null ->
2818 make.Literal(TypeTag.BOT, null).setType(syms.botType);
2819 case CoreOp.ConstantOp constantOp -> make.Literal(constantOp.value());
2820 case JavaOp.InvokeOp invokeOp -> translateInvokeOp(invokeOp);
2821 case JavaOp.NewOp newOp when newOp.resultType() instanceof jdk.incubator.code.dialect.java.ArrayType at -> {
2822 var elemType = make.Ident(typeElementToType(at.componentType()).tsym);
2823 var dims = new ListBuffer<JCTree.JCExpression>();
2824 for (int d = 0; d < at.dimensions(); d++) {
2825 dims.add(toExpr(translateOp(newOp.operands().get(d))));
2826 }
2827 var na = make.NewArray(elemType, dims.toList(), null);
2828 na.type = typeElementToType(at);
2829 yield na;
2830 }
2831 case JavaOp.NewOp newOp -> {
2832 var ownerType = typeElementToType(newOp.constructorDescriptor().refType());
2833 var clazz = make.Ident(ownerType.tsym);
2834 var args = new ListBuffer<JCTree.JCExpression>();
2835 for (Value operand : newOp.operands()) {
2836 args.add(toExpr(translateOp(operand)));
2837 }
2838 var nc = make.NewClass(null, null, clazz, args.toList(), null);
2839 if (newOp.isVarargs()) {
2840 setVarargs(nc, newOp.constructorDescriptor().type());
2841 }
2842 nc.type = ownerType;
2843 nc.constructor = constructorDescriptorToSymbol(newOp.constructorDescriptor());
2844 nc.constructorType = nc.constructor.type;
2845 yield nc;
2846 }
2847 case CoreOp.ReturnOp returnOp -> make.Return(toExpr(translateOp(returnOp.returnValue())));
2848 case JavaOp.FieldAccessOp.FieldLoadOp fieldLoadOp -> {
2849 var sym = fieldDescriptorToSymbol(fieldLoadOp.fieldDescriptor());
2850 Assert.check(sym.isStatic());
2851 yield make.Select(make.Ident(sym.owner), sym);
2852 }
2853 case JavaOp.ArrayAccessOp.ArrayStoreOp arrayStoreOp -> {
2854 var array = arrayStoreOp.operands().get(0);
2855 var index = arrayStoreOp.operands().get(1);
2856 var val = arrayStoreOp.operands().get(2);
2857 var as = make.Assign(
2858 make.Indexed(
2859 toExpr(translateOp(array)), toExpr(translateOp(index))), toExpr(translateOp(val))
2860 );
2861 as.type = typeElementToType(((jdk.incubator.code.dialect.java.ArrayType) array.type()).componentType());
2862 yield as;
2863 }
2864 default ->
2865 throw new IllegalStateException("Op -> JCTree not supported for :" + op.getClass().getName());
2866 };
2867 valueToTree.put(v, tree);
2868 return tree;
2869 }
2870 }
2871
2872 // type and ref conversion utils
2873
2874 JavaType symbolToErasedDesc(Symbol s) {
2875 return typeToTypeElement(s.erasure(types));
2876 }
2877
2878 JavaType typeToTypeElement(Type t) {
2879 Assert.check(!t.hasTag(METHOD));
2880 t = types.upward(t, false, types.captures(t));
2881 return switch (t.getTag()) {
2882 case VOID -> JavaType.VOID;
2883 case CHAR -> JavaType.CHAR;
2884 case BOOLEAN -> JavaType.BOOLEAN;
2885 case BYTE -> JavaType.BYTE;
2886 case SHORT -> JavaType.SHORT;
2887 case INT -> JavaType.INT;
2888 case FLOAT -> JavaType.FLOAT;
2889 case LONG -> JavaType.LONG;
2890 case DOUBLE -> JavaType.DOUBLE;
2891 case ARRAY -> {
2892 Type et = ((ArrayType)t).elemtype;
2893 yield JavaType.array(typeToTypeElement(et));
2894 }
2895 case WILDCARD -> {
2896 Type.WildcardType wt = (Type.WildcardType)t;
2897 yield wt.isUnbound() ?
2898 JavaType.wildcard() :
2899 JavaType.wildcard(wt.isExtendsBound() ? BoundKind.EXTENDS : BoundKind.SUPER, typeToTypeElement(wt.type));
2900 }
2901 case TYPEVAR -> t.tsym.owner.kind == Kind.MTH ?
2902 JavaType.typeVarRef(t.tsym.name.toString(), symbolToMethodRef(t.tsym.owner),
2903 typeToTypeElement(t.getUpperBound())) :
2904 JavaType.typeVarRef(t.tsym.name.toString(),
2905 (jdk.incubator.code.dialect.java.ClassType)symbolToErasedDesc(t.tsym.owner),
2906 typeToTypeElement(t.getUpperBound()));
2907 case CLASS -> {
2908 Assert.check(!t.isIntersection() && !t.isUnion());
2909 JavaType typ;
2910 if (t.getEnclosingType() != Type.noType) {
2911 Name innerName = t.tsym.flatName().subName(t.getEnclosingType().tsym.flatName().length() + 1);
2912 typ = JavaType.qualified(typeToTypeElement(t.getEnclosingType()), innerName.toString());
2913 } else {
2914 typ = JavaType.type(ClassDesc.of(t.tsym.flatName().toString()));
2915 }
2916
2917 List<JavaType> typeArguments;
2918 if (t.getTypeArguments().nonEmpty()) {
2919 typeArguments = new ArrayList<>();
2920 for (Type ta : t.getTypeArguments()) {
2921 typeArguments.add(typeToTypeElement(ta));
2922 }
2923 } else {
2924 typeArguments = List.of();
2925 }
2926
2927 // Use flat name to ensure demarcation of nested classes
2928 yield JavaType.parameterized(typ, typeArguments);
2929 }
2930 default -> throw new UnsupportedOperationException("Unsupported type: kind=" + t.getKind() + " type=" + t);
2931 };
2932 }
2933
2934 Type typeElementToType(TypeElement jt) {
2935 return switch (jt) {
2936 case PrimitiveType pt when pt == JavaType.BOOLEAN -> syms.booleanType;
2937 case PrimitiveType pt when pt == JavaType.CHAR -> syms.charType;
2938 case PrimitiveType pt when pt == JavaType.BYTE -> syms.byteType;
2939 case PrimitiveType pt when pt == JavaType.SHORT -> syms.shortType;
2940 case PrimitiveType pt when pt == JavaType.INT -> syms.intType;
2941 case PrimitiveType pt when pt == JavaType.LONG -> syms.longType;
2942 case PrimitiveType pt when pt == JavaType.FLOAT -> syms.floatType;
2943 case PrimitiveType pt when pt == JavaType.DOUBLE -> syms.doubleType;
2944 case ClassType ct when ct.hasTypeArguments() -> {
2945 Type enclosing = ct.enclosingType().map(this::typeElementToType).orElse(Type.noType);
2946 com.sun.tools.javac.util.List<Type> typeArgs = com.sun.tools.javac.util.List.from(ct.typeArguments()).map(this::typeElementToType);
2947 yield new Type.ClassType(enclosing, typeArgs, typeElementToType(ct.rawType()).tsym);
2948 }
2949 case ClassType ct -> types.erasure(syms.enterClass(attrEnv().toplevel.modle, ct.toClassName()));
2950 case jdk.incubator.code.dialect.java.ArrayType at -> new Type.ArrayType(typeElementToType(at.componentType()), syms.arrayClass);
2951 default -> Type.noType;
2952 };
2953 }
2954
2955 Type symbolSiteType(Symbol s) {
2956 boolean isMember = s.owner == syms.predefClass ||
2957 s.isMemberOf(currentClassSym, types);
2958 return isMember ? currentClassSym.type : s.owner.type;
2959 }
2960
2961 FieldRef symbolToFieldRef(Symbol s, Type site) {
2962 // @@@ Made Gen::binaryQualifier public, duplicate logic?
2963 // Ensure correct qualifying class is used in the reference, see JLS 13.1
2964 // https://docs.oracle.com/javase/specs/jls/se20/html/jls-13.html#jls-13.1
2965 return symbolFieldRef(gen.binaryQualifier(s, types.erasure(site)));
2966 }
2967
2968 FieldRef symbolFieldRef(Symbol s) {
2969 Type erasedType = s.erasure(types);
2970 return FieldRef.field(
2971 typeToTypeElement(s.owner.erasure(types)),
2972 s.name.toString(),
2973 typeToTypeElement(erasedType));
2974 }
2975
2976 MethodRef symbolToMethodRef(Symbol s, Type site) {
2977 // @@@ Made Gen::binaryQualifier public, duplicate logic?
2978 // Ensure correct qualifying class is used in the reference, see JLS 13.1
2979 // https://docs.oracle.com/javase/specs/jls/se20/html/jls-13.html#jls-13.1
2980 return symbolToMethodRef(gen.binaryQualifier(s, types.erasure(site)));
2981 }
2982
2983 MethodRef symbolToMethodRef(Symbol s) {
2984 Type erasedType = s.erasure(types);
2985 return MethodRef.method(
2986 typeToTypeElement(s.owner.erasure(types)),
2987 s.name.toString(),
2988 typeToTypeElement(erasedType.getReturnType()),
2989 erasedType.getParameterTypes().stream().map(this::typeToTypeElement).toArray(TypeElement[]::new));
2990 }
2991
2992 FunctionType typeToFunctionType(Type t) {
2993 return CoreType.functionType(
2994 typeToTypeElement(t.getReturnType()),
2995 t.getParameterTypes().stream().map(this::typeToTypeElement).toArray(TypeElement[]::new));
2996 }
2997
2998 RecordTypeRef symbolToRecordTypeRef(Symbol.ClassSymbol s) {
2999 TypeElement recordType = typeToTypeElement(s.type);
3000 List<RecordTypeRef.ComponentRef> components = s.getRecordComponents().stream()
3001 .map(rc -> new RecordTypeRef.ComponentRef(typeToTypeElement(rc.type), rc.name.toString()))
3002 .toList();
3003 return RecordTypeRef.recordType(recordType, components);
3004 }
3005
3006 Env<AttrContext> attrEnv() {
3007 return typeEnvs.get(currentClassSym);
3008 }
3009
3010 VarSymbol fieldDescriptorToSymbol(FieldRef fieldRef) {
3011 Name name = names.fromString(fieldRef.name());
3012 Type site = typeElementToType(fieldRef.refType());
3013 return resolve.resolveInternalField(attrEnv().enclClass, attrEnv(), site, name);
3014 }
3015
3016 MethodSymbol methodDescriptorToSymbol(MethodRef methodRef) {
3017 Name name = names.fromString(methodRef.name());
3018 Type site = typeElementToType(methodRef.refType());
3019 com.sun.tools.javac.util.List<Type> argtypes = methodRef.type().parameterTypes().stream()
3020 .map(this::typeElementToType).collect(com.sun.tools.javac.util.List.collector());
3021 return resolve.resolveInternalMethod(attrEnv().enclClass, attrEnv(), site, name, argtypes, com.sun.tools.javac.util.List.nil());
3022 }
3023
3024 MethodSymbol constructorDescriptorToSymbol(ConstructorRef constructorRef) {
3025 Type site = typeElementToType(constructorRef.refType());
3026 com.sun.tools.javac.util.List<Type> argtypes = constructorRef.type().parameterTypes().stream()
3027 .map(this::typeElementToType).collect(com.sun.tools.javac.util.List.collector());
3028 return resolve.resolveInternalConstructor(attrEnv().enclClass, attrEnv(), site, argtypes, com.sun.tools.javac.util.List.nil());
3029 }
3030 }