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 java.lang.reflect.code.parser;
27
28 import java.io.IOException;
29 import java.io.InputStream;
30 import java.lang.reflect.code.*;
31 import java.lang.reflect.code.type.FunctionType;
32 import java.lang.reflect.code.op.*;
33 import java.lang.reflect.code.parser.impl.DescParser;
34 import java.lang.reflect.code.parser.impl.Lexer;
35 import java.lang.reflect.code.parser.impl.Scanner;
36 import java.lang.reflect.code.parser.impl.Tokens;
37 import java.lang.reflect.code.type.CoreTypeFactory;
38 import java.lang.reflect.code.type.TypeElementFactory;
39 import java.nio.charset.StandardCharsets;
40 import java.util.ArrayList;
41 import java.util.HashMap;
42 import java.util.List;
43 import java.util.Map;
44
45 /**
46 * A parser of serialized code models from their textual form.
47 * <p>
48 * The syntactic grammar of a code mode is specified in the grammar notation, and is a subset of the grammar,
49 * specified by the JLS, see section 2.4. (Except that we cannot express non-terminal symbols in italic type.)
50 * <p>
51 * {@snippet lang=text :
52 * Operation:
53 * [Value =] Name {Operands} {Successors} {Attributes} {Bodies} ;
54 *
55 * Operands:
56 * ValueIdentifier {ValueIdentifier}
57 *
58 * Successors:
59 * Successor {Successor}
60 *
61 * Successor:
62 * BlockIdentifier
63 * BlockIdentifier ()
64 * BlockIdentifier ( ValueIdentifier {, ValueIdentifier} )
65 *
66 * Attributes:
67 * Attribute {Attribute}
68 *
69 * Attribute:
70 * @ AttributeValue
71 * @ Name = AttributeValue
72 *
73 * AttributeValue:
74 * Name
75 * StringLiteral
76 * NullLiteral
77 *
78 * Bodies:
79 * Body {Body}
80 *
81 * Body:
82 * BlockIdentifier ( ) Type -> { Operations {Block} }
83 * BlockIdentifier ( Value {, Value} ) Type -> { Operations {Block} }
84 *
85 * Operations:
86 * Operation {Operation}
87 *
88 * Block:
89 * BlockIdentifier : Operations
90 * BlockIdentifier ( ) : Operations
91 * BlockIdentifier ( Value {, Value} ) : Operations
92 *
93 * BlockIdentifier:
94 * ^ Identifier
95 *
96 * Value:
97 * ValueIdentifier : Type
98 *
99 * ValueIdentifier:
100 * % JavaLetterOrDigit {JavaLetterOrDigit}
101 *
102 * Name:
103 * Identifier
104 * Name . Identifier
105 *
106 * Type:
107 * same as in section 4.1 of JLS but without any annotations
108 *
109 * Identifier:
110 * same as in section 3 of JLS
111 *
112 * JavaLetterOrDigit:
113 * same as in section 3 of JLS
114 *
115 * StringLiteral:
116 * same as in section 3 of JLS
117 *
118 * NullLiteral:
119 * same as in section 3 of JLS
120 * }
121 */
122 public final class OpParser {
123
124 static final TypeElement.ExternalizedTypeElement VOID =
125 new TypeElement.ExternalizedTypeElement("void", List.of());
126
127 /**
128 * Parse a code model from its serialized textual form obtained from an input stream.
129 *
130 * @param opFactory the operation factory used to construct operations from their general definition
131 * @param in the input stream
132 * @return the list of operations
133 * @throws IOException if parsing fails
134 */
135 public static List<Op> fromStream(OpFactory opFactory, InputStream in) throws IOException {
136 return fromStream(opFactory, CoreTypeFactory.CORE_TYPE_FACTORY, in);
137 }
138
139 public static List<Op> fromStream(OpFactory opFactory, TypeElementFactory typeFactory, InputStream in) throws IOException {
140 String s = new String(in.readAllBytes(), StandardCharsets.UTF_8);
141 return fromString(opFactory, typeFactory, s);
142 }
143
144 /**
145 * Parse a code model from its serialized textual form obtained from an input string.
146 *
147 * @param opFactory the operation factory used to construct operations from their general definition
148 * @param in the input string
149 * @return the list of operations
150 */
151 public static List<Op> fromString(OpFactory opFactory, String in) {
152 return parse(opFactory, CoreTypeFactory.CORE_TYPE_FACTORY, in);
153 }
154
155 public static List<Op> fromString(OpFactory opFactory, TypeElementFactory typeFactory, String in) {
156 return parse(opFactory, typeFactory, in);
157 }
158
159 /**
160 * Parse a code model, modeling a method, from its serialized textual form obtained from an input string.
161 *
162 * @param in the input string
163 * @return the func operation
164 */
165 public static Op fromStringOfFuncOp(String in) {
166 Op op = fromString(ExtendedOp.FACTORY, in).get(0);
167 if (!(op instanceof CoreOp.FuncOp)) {
168 throw new IllegalArgumentException("Op is not a FuncOp: " + op);
169 }
170 return op;
171 }
172
173 static List<Op> parse(OpFactory opFactory, TypeElementFactory typeFactory, String in) {
174 Lexer lexer = Scanner.factory().newScanner(in);
175 lexer.nextToken();
176
177 List<OpNode> opNodes = new OpParser(lexer).parseNodes();
178
179 Context c = new Context(opFactory, typeFactory);
180 return opNodes.stream().map(n -> nodeToOp(n, VOID, c, null)).toList();
181 }
182
183
184 static final class Context {
185 final Context parent;
186 final OpFactory opFactory;
187 final TypeElementFactory typeFactory;
188 final Map<String, Value> valueMap;
189 final Map<String, Block.Builder> blockMap;
190
191 Context(Context that, boolean isolated) {
192 this.parent = that;
193 this.opFactory = that.opFactory;
194 this.typeFactory = that.typeFactory;
195 this.valueMap = isolated ? new HashMap<>() : new HashMap<>(that.valueMap);
196 this.blockMap = new HashMap<>();
197 }
198
199 Context(OpFactory opFactory, TypeElementFactory typeFactory) {
200 this.parent = null;
201 this.opFactory = opFactory;
202 this.typeFactory = typeFactory;
203 this.valueMap = new HashMap<>();
204 this.blockMap = new HashMap<>();
205 }
206
207 Context fork(boolean isolated) {
208 return new Context(this, isolated);
209 }
210
211 void putValue(String name, Value opr) {
212 valueMap.put(name, opr);
213 }
214
215 Value getValue(String name) {
216 Value value = valueMap.get(name);
217 if (value == null) {
218 // @@@ location
219 throw new IllegalArgumentException("Undeclared value referenced: " + name);
220 }
221
222 return value;
223 }
224
225 void putBlock(String name, Block.Builder bm) {
226 blockMap.put(name, bm);
227 }
228
229 Block.Builder getBlock(String name) {
230 Block.Builder block = blockMap.get(name);
231 if (block == null) {
232 // @@@ location
233 throw new IllegalArgumentException("Undeclared block referenced: " + name);
234 }
235
236 return block;
237 }
238 }
239
240 static Op nodeToOp(OpNode opNode, TypeElement.ExternalizedTypeElement rtype, Context c, Body.Builder ancestorBody) {
241 ExternalizableOp.ExternalizedOp opdef = nodeToOpDef(opNode, rtype, c, ancestorBody);
242 return c.opFactory.constructOpOrFail(opdef);
243 }
244
245 static ExternalizableOp.ExternalizedOp nodeToOpDef(OpNode opNode, TypeElement.ExternalizedTypeElement rtype, Context c, Body.Builder ancestorBody) {
246 String operationName = opNode.name;
247 List<Value> operands = opNode.operands.stream().map(c::getValue).toList();
248 List<Block.Reference> successors = opNode.successors.stream()
249 .map(n -> nodeToSuccessor(n, c)).toList();
250 List<Body.Builder> bodies = opNode.bodies.stream()
251 .map(n -> nodeToBody(n, c.fork(false), ancestorBody)).toList();
252 return new ExternalizableOp.ExternalizedOp(operationName,
253 operands,
254 successors,
255 c.typeFactory.constructType(rtype),
256 opNode.attributes,
257 bodies);
258 }
259
260 static Body.Builder nodeToBody(BodyNode n, Context c, Body.Builder ancestorBody) {
261 Body.Builder body = Body.Builder.of(ancestorBody,
262 // Create function type with just the return type and add parameters afterward
263 FunctionType.functionType(c.typeFactory.constructType(n.rtype)));
264 Block.Builder eb = body.entryBlock();
265
266 // Create blocks upfront for forward referencing successors
267 for (int i = 0; i < n.blocks.size(); i++) {
268 BlockNode bn = n.blocks.get(i);
269 Block.Builder b;
270 if (i == 0) {
271 b = body.entryBlock();
272 } else {
273 b = eb.block();
274 c.putBlock(bn.name, b);
275 }
276
277 for (ValueNode a : bn.parameters) {
278 Block.Parameter v = b.parameter(c.typeFactory.constructType(a.type));
279 c.putValue(a.name, v);
280 }
281 }
282
283 // Create operations
284 for (int i = 0; i < n.blocks.size(); i++) {
285 BlockNode bn = n.blocks.get(i);
286 Block.Builder b;
287 if (i == 0) {
288 b = body.entryBlock();
289 } else {
290 b = c.getBlock(n.blocks.get(i).name);
291 }
292
293 for (OpNode on : bn.ops) {
294 ValueNode r = on.result;
295 if (r != null) {
296 Op.Result v = b.op(nodeToOp(on, r.type, c, body));
297 c.putValue(r.name, v);
298 } else {
299 b.op(nodeToOp(on, VOID, c, body));
300 }
301 }
302 }
303
304 return body;
305 }
306
307 static Block.Reference nodeToSuccessor(SuccessorNode n, Context c) {
308 return c.getBlock(n.blockName).successor(n.arguments().stream().map(c::getValue).toList());
309 }
310
311 // @@@ Add tokens to access position of nodes on error
312
313 record OpNode(ValueNode result,
314 String name,
315 List<String> operands,
316 List<SuccessorNode> successors,
317 Map<String, Object> attributes,
318 List<BodyNode> bodies) {
319 }
320
321 record SuccessorNode(String blockName,
322 List<String> arguments) {
323 }
324
325 record BodyNode(TypeElement.ExternalizedTypeElement rtype,
326 List<BlockNode> blocks) {
327 }
328
329 record BlockNode(String name,
330 List<ValueNode> parameters,
331 List<OpNode> ops) {
332 }
333
334 record ValueNode(String name,
335 TypeElement.ExternalizedTypeElement type) {
336 }
337
338 final Lexer lexer;
339
340 OpParser(Lexer lexer) {
341 this.lexer = lexer;
342 }
343
344 List<OpNode> parseNodes() {
345 List<OpNode> ops = new ArrayList<>();
346 while (lexer.token().kind != Tokens.TokenKind.EOF) {
347 ops.add(parseOperation());
348 }
349 return ops;
350 }
351
352 OpNode parseOperation() {
353 ValueNode operationResult;
354 if (lexer.is(Tokens.TokenKind.VALUE_IDENTIFIER)) {
355 operationResult = parseValueNode();
356 lexer.accept(Tokens.TokenKind.EQ);
357 } else {
358 operationResult = null;
359 }
360
361 String operationName = parseName();
362
363 // Operands
364 final List<String> operands;
365 if (lexer.is(Tokens.TokenKind.VALUE_IDENTIFIER)) {
366 operands = parseOperands();
367 } else {
368 operands = List.of();
369 }
370
371 // Successors
372 // ^name(%x, %d)
373 final List<SuccessorNode> successors;
374 if (lexer.is(Tokens.TokenKind.CARET)) {
375 successors = parseSuccessors();
376 } else {
377 successors = List.of();
378 }
379
380 // Attributes
381 final Map<String, Object> attributes;
382 if (lexer.is(Tokens.TokenKind.MONKEYS_AT)) {
383 attributes = parseAttributes();
384 } else {
385 attributes = Map.of();
386 }
387
388 // Bodies
389 List<BodyNode> bodies;
390 if (lexer.is(Tokens.TokenKind.CARET) || lexer.is(Tokens.TokenKind.LPAREN)) {
391 bodies = parseBodies();
392 } else {
393 bodies = List.of();
394 }
395
396 lexer.accept(Tokens.TokenKind.SEMI);
397
398 return new OpNode(operationResult, operationName, operands, successors, attributes, bodies);
399 }
400
401 Map<String, Object> parseAttributes() {
402 Map<String, Object> attributes = new HashMap<>();
403 while (lexer.acceptIf(Tokens.TokenKind.MONKEYS_AT)) {
404 String attributeName;
405 if (lexer.is(Tokens.TokenKind.IDENTIFIER)) {
406 attributeName = parseName();
407 lexer.accept(Tokens.TokenKind.EQ);
408 } else {
409 attributeName = "";
410 }
411 Object attributeValue = parseAttributeValue();
412 attributes.put(attributeName, attributeValue);
413 }
414 return attributes;
415 }
416
417 Object parseAttributeValue() {
418 if (lexer.is(Tokens.TokenKind.IDENTIFIER)) {
419 return parseName();
420 }
421
422 Object value = parseLiteral(lexer.token());
423 lexer.nextToken();
424
425 return value;
426 }
427
428 Object parseLiteral(Tokens.Token t) {
429 return switch (t.kind) {
430 case STRINGLITERAL -> t.stringVal();
431 case NULL -> ExternalizableOp.NULL_ATTRIBUTE_VALUE;
432 default -> throw lexer.unexpected();
433 };
434 }
435
436 List<String> parseOperands() {
437 List<String> operands = new ArrayList<>();
438 while (lexer.is(Tokens.TokenKind.VALUE_IDENTIFIER)) {
439 operands.add(lexer.token().name().substring(1));
440 lexer.nextToken();
441 }
442 return operands;
443 }
444
445 List<SuccessorNode> parseSuccessors() {
446 List<SuccessorNode> successors = new ArrayList<>();
447
448 while (lexer.is(Tokens.TokenKind.CARET) && !isBody()) {
449 lexer.nextToken();
450 successors.add(parseSuccessor());
451 }
452
453 return successors;
454 }
455
456 // Lookahead from "^" to determine if Body
457 boolean isBody() {
458 assert lexer.is(Tokens.TokenKind.CARET);
459
460 int pos = 1;
461 lexer.token(pos++);
462 assert lexer.token(1).kind == Tokens.TokenKind.IDENTIFIER;
463
464 if (lexer.token(pos++).kind != Tokens.TokenKind.LPAREN) {
465 return false;
466 }
467
468 Tokens.Token t;
469 while ((t = lexer.token(pos++)).kind != Tokens.TokenKind.RPAREN) {
470 if (t.kind == Tokens.TokenKind.EOF) {
471 return false;
472 } else if (t.kind == Tokens.TokenKind.COLON) {
473 // Encountered Value
474 return true;
475 }
476 }
477
478 // Encountered return type
479 return lexer.token(pos++).kind == Tokens.TokenKind.IDENTIFIER;
480 }
481
482 SuccessorNode parseSuccessor() {
483 String blockName = lexer.accept(Tokens.TokenKind.IDENTIFIER).name();
484
485 List<String> arguments = new ArrayList<>();
486 if (lexer.acceptIf(Tokens.TokenKind.LPAREN) && !lexer.acceptIf(Tokens.TokenKind.RPAREN)) {
487 do {
488 arguments.add(lexer.accept(Tokens.TokenKind.VALUE_IDENTIFIER).name().substring(1));
489 } while (lexer.acceptIf(Tokens.TokenKind.COMMA));
490 lexer.accept(Tokens.TokenKind.RPAREN);
491 }
492
493 return new SuccessorNode(blockName, arguments);
494 }
495
496 List<BodyNode> parseBodies() {
497 List<BodyNode> bodies = new ArrayList<>();
498 while (lexer.is(Tokens.TokenKind.CARET) || lexer.is(Tokens.TokenKind.LPAREN)) {
499 BodyNode body = parseBody();
500 bodies.add(body);
501 }
502 return bodies;
503 }
504
505 BodyNode parseBody() {
506 // Body name
507 final String bodyName;
508 if (lexer.acceptIf(Tokens.TokenKind.CARET)) {
509 bodyName = lexer.accept(Tokens.TokenKind.IDENTIFIER).name();
510 } else {
511 bodyName = null;
512 }
513
514 // Entry block header
515 List<ValueNode> arguments = parseBlockHeaderArguments(true);
516 // Body return type
517 TypeElement.ExternalizedTypeElement rtype = parseExTypeElem();
518
519 lexer.accept(Tokens.TokenKind.ARROW);
520 lexer.accept(Tokens.TokenKind.LBRACE);
521
522 List<BlockNode> blocks = parseBlocks(bodyName, arguments);
523
524 lexer.accept(Tokens.TokenKind.RBRACE);
525
526 return new BodyNode(rtype, blocks);
527 }
528
529 List<ValueNode> parseBlockHeaderArguments(boolean isEntryBlock) {
530 boolean parseArguments;
531 if (isEntryBlock) {
532 lexer.accept(Tokens.TokenKind.LPAREN);
533 parseArguments = true;
534 } else {
535 parseArguments = lexer.acceptIf(Tokens.TokenKind.LPAREN);
536 }
537 if (!parseArguments || lexer.acceptIf(Tokens.TokenKind.RPAREN)) {
538 return new ArrayList<>();
539 }
540
541 List<ValueNode> arguments = new ArrayList<>();
542 do {
543 arguments.add(parseValueNode());
544 } while (lexer.acceptIf(Tokens.TokenKind.COMMA));
545 lexer.accept(Tokens.TokenKind.RPAREN);
546
547 return arguments;
548 }
549
550 ValueNode parseValueNode() {
551 String valueName = lexer.accept(Tokens.TokenKind.VALUE_IDENTIFIER).name().substring(1);
552
553 lexer.accept(Tokens.TokenKind.COLON);
554
555 TypeElement.ExternalizedTypeElement type = parseExTypeElem();
556
557 return new ValueNode(valueName, type);
558 }
559
560 List<BlockNode> parseBlocks(String entryBlockName, List<ValueNode> entryBlockArguments) {
561 List<BlockNode> blocks = new ArrayList<>();
562
563 // Entry block ops
564 BlockNode entryBlock = new BlockNode(entryBlockName, entryBlockArguments, parseOperations());
565 blocks.add(entryBlock);
566
567 // Subsequent blocks
568 while (lexer.acceptIf(Tokens.TokenKind.CARET)) {
569 String blockName = lexer.accept(Tokens.TokenKind.IDENTIFIER).name();
570 List<ValueNode> blockArguments = parseBlockHeaderArguments(false);
571
572 lexer.accept(Tokens.TokenKind.COLON);
573
574 BlockNode block = new BlockNode(blockName, blockArguments, parseOperations());
575 blocks.add(block);
576 }
577
578 return blocks;
579 }
580
581 List<OpNode> parseOperations() {
582 List<OpNode> ops = new ArrayList<>();
583 while (lexer.is(Tokens.TokenKind.MONKEYS_AT) || lexer.is(Tokens.TokenKind.VALUE_IDENTIFIER) || lexer.is(Tokens.TokenKind.IDENTIFIER)) {
584 OpNode op = parseOperation();
585 ops.add(op);
586 }
587 return ops;
588 }
589
590 String parseName() {
591 Tokens.Token t = lexer.accept(Tokens.TokenKind.IDENTIFIER);
592 StringBuilder name = new StringBuilder();
593 name.append(t.name());
594 while (lexer.acceptIf(Tokens.TokenKind.DOT)) {
595 name.append(Tokens.TokenKind.DOT.name);
596 t = lexer.accept(Tokens.TokenKind.IDENTIFIER);
597 name.append(t.name());
598 }
599 return name.toString();
600 }
601
602 TypeElement.ExternalizedTypeElement parseExTypeElem() {
603 return DescParser.parseExTypeElem(lexer);
604 }
605 }
606