forked from GoogleCloudPlatform/cloud-debug-java
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathjava_expression.h
More file actions
446 lines (316 loc) · 11.5 KB
/
java_expression.h
File metadata and controls
446 lines (316 loc) · 11.5 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
/**
* Copyright 2015 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef DEVTOOLS_CDBG_DEBUGLETS_JAVA_JAVA_EXPRESSION_H_
#define DEVTOOLS_CDBG_DEBUGLETS_JAVA_JAVA_EXPRESSION_H_
#include <list>
#include <memory>
#include "common.h"
#include "expression_util.h"
namespace devtools {
namespace cdbg {
class ExpressionEvaluator;
struct FormatMessageModel;
// Interface representing a node in parsed expression tree.
class JavaExpression {
public:
virtual ~JavaExpression() { }
// Prints the expression subtree to the stream. When "concise" is true, the
// function prints expression in Java format. When "concise" is false, a
// much more verbose format is used (this mode is used by unit test to
// disambiguate different types of expressions that might look the same in
// concise format).
virtual void Print(std::ostream* os, bool concise) = 0;
// Tries to convert the expression subtree into a type name. For
// example: Member("String", Member("lang", Identifier("java")) can be
// converted to "java.lang.String". At the same time (a+b) cannot.
virtual bool TryGetTypeName(string* name) const = 0;
// Compiles the expression into executable format. The caller owns the
// returned instance. If a particular language feature is not yet supported,
// the function returns null and prints description in "error_message".
virtual CompiledExpression CreateEvaluator() = 0;
};
// Represents (a ? b : c) conditional expression.
class ConditionalJavaExpression : public JavaExpression {
public:
// Takes ownership over the passed instances of "JavaExpression";
ConditionalJavaExpression(
JavaExpression* condition,
JavaExpression* if_true,
JavaExpression* if_false);
void Print(std::ostream* os, bool concise) override;
bool TryGetTypeName(string* name) const override { return false; }
CompiledExpression CreateEvaluator() override;
private:
std::unique_ptr<JavaExpression> condition_;
std::unique_ptr<JavaExpression> if_true_;
std::unique_ptr<JavaExpression> if_false_;
DISALLOW_COPY_AND_ASSIGN(ConditionalJavaExpression);
};
// Represents any kind of binary expression (like a + b).
class BinaryJavaExpression : public JavaExpression {
public:
enum class Type {
add,
sub,
mul,
div,
mod,
conditional_and,
conditional_or,
eq,
ne,
le,
ge,
lt,
gt,
bitwise_and,
bitwise_or,
bitwise_xor,
shl,
shr_s,
shr_u
};
// Takes ownership over "a" and "b" expression subtrees.
BinaryJavaExpression(Type type, JavaExpression* a, JavaExpression* b);
void Print(std::ostream* os, bool concise) override;
bool TryGetTypeName(string* name) const override { return false; }
CompiledExpression CreateEvaluator() override;
private:
const Type type_;
std::unique_ptr<JavaExpression> a_;
std::unique_ptr<JavaExpression> b_;
DISALLOW_COPY_AND_ASSIGN(BinaryJavaExpression);
};
// Represents unary expression (like ~a).
class UnaryJavaExpression : public JavaExpression {
public:
enum class Type {
plus,
minus,
bitwise_complement,
logical_complement
};
// Takes ownership over "a" expression subtree.
UnaryJavaExpression(Type type, JavaExpression* a);
void Print(std::ostream* os, bool concise) override;
bool TryGetTypeName(string* name) const override { return false; }
CompiledExpression CreateEvaluator() override;
private:
const Type type_;
std::unique_ptr<JavaExpression> a_;
DISALLOW_COPY_AND_ASSIGN(UnaryJavaExpression);
};
class JavaIntLiteral : public JavaExpression {
public:
JavaIntLiteral() : is_long_(false) { }
// Parses an integer in the given base from the given string.
bool ParseString(const string& str, int base);
void Print(std::ostream* os, bool concise) override;
bool TryGetTypeName(string* name) const override { return false; }
CompiledExpression CreateEvaluator() override;
private:
// Returns true if this is a long integer.
bool IsLong() const { return is_long_; }
private:
// Indicates whether this is an int or a long.
bool is_long_;
jlong n_;
DISALLOW_COPY_AND_ASSIGN(JavaIntLiteral);
};
class JavaFloatLiteral : public JavaExpression {
public:
JavaFloatLiteral() : is_double_(true) { }
// Parses a floating point number from the given string.
bool ParseString(const string& str);
void Print(std::ostream* os, bool concise) override;
bool TryGetTypeName(string* name) const override { return false; }
CompiledExpression CreateEvaluator() override;
// Returns true if this is a double.
bool IsDouble() const { return is_double_; }
private:
// Indicates whether this is an float or a double.
bool is_double_;
jdouble d_;
DISALLOW_COPY_AND_ASSIGN(JavaFloatLiteral);
};
// Represents character constant. All characters in Java are Unicode, so
// this is a 16 bit integer.
class JavaCharLiteral : public JavaExpression {
public:
JavaCharLiteral() : ch_('\0') { }
// Decodes the potentially escaped character into a Unicode character.
// Examples for encoding are: '\n', '\\', '\293', '\u5C7f'.
bool ParseString(const string& str);
void Print(std::ostream* os, bool concise) override;
bool TryGetTypeName(string* name) const override { return false; }
CompiledExpression CreateEvaluator() override;
private:
jchar ch_;
DISALLOW_COPY_AND_ASSIGN(JavaCharLiteral);
};
// Represents a Java string constant.
class JavaStringLiteral : public JavaExpression {
public:
JavaStringLiteral() { }
// Decodes the potentially escaped characters sequence into Java string.
// Example of encoded string: "This\n is\t an\" \u1E3B encoded \88 string".
bool ParseString(const string& str);
void Print(std::ostream* os, bool concise) override;
bool TryGetTypeName(string* name) const override { return false; }
CompiledExpression CreateEvaluator() override;
private:
std::vector<jchar> str_;
DISALLOW_COPY_AND_ASSIGN(JavaStringLiteral);
};
// Represents a boolean constant.
class JavaBooleanLiteral : public JavaExpression {
public:
explicit JavaBooleanLiteral(jboolean n) : n_(n) { }
void Print(std::ostream* os, bool concise) override;
bool TryGetTypeName(string* name) const override { return false; }
CompiledExpression CreateEvaluator() override;
private:
const jboolean n_;
DISALLOW_COPY_AND_ASSIGN(JavaBooleanLiteral);
};
// Represents Java "null".
class JavaNullLiteral : public JavaExpression {
public:
JavaNullLiteral() { }
void Print(std::ostream* os, bool concise) override;
bool TryGetTypeName(string* name) const override { return false; }
CompiledExpression CreateEvaluator() override;
private:
DISALLOW_COPY_AND_ASSIGN(JavaNullLiteral);
};
// Represents a local or a static variable.
class JavaIdentifier : public JavaExpression {
public:
explicit JavaIdentifier(string identifier)
: identifier_(identifier) {
}
void Print(std::ostream* os, bool concise) override;
bool TryGetTypeName(string* name) const override;
CompiledExpression CreateEvaluator() override;
private:
const string identifier_;
DISALLOW_COPY_AND_ASSIGN(JavaIdentifier);
};
// Represents a type cast for classes or interfaces.
class TypeCastJavaExpression : public JavaExpression {
public:
explicit TypeCastJavaExpression(string type, JavaExpression* source)
: type_(type),
source_(std::unique_ptr<JavaExpression>(source)) {
}
void Print(std::ostream* os, bool concise) override;
bool TryGetTypeName(string* name) const override { return false; }
CompiledExpression CreateEvaluator() override;
private:
const string type_;
std::unique_ptr<JavaExpression> source_;
DISALLOW_COPY_AND_ASSIGN(TypeCastJavaExpression);
};
// Base class representing additional transformation applied to an object. Two
// types of selectors are currently supported:
// 1. Array indexer: a[8].
// 2. Dereferencing a member: a.member.
class JavaExpressionSelector : public JavaExpression {
public:
// Setter for "source_". See "source_" comments for explanation. Takes
// ownership over the "source" expression subtree.
void set_source(JavaExpression* source) {
source_.reset(source);
}
protected:
// Represents the base expression on which the selector is applied. In the
// two examples above, "source_" will be "a". A more complicated example:
// (flag ? a1 : a2)[8]
// In this case "source_" will be the expression corresponding to
// "flag ? a1 : a2".
std::unique_ptr<JavaExpression> source_;
};
// Selector for array item. The index is also expression to support
// constructions like a[x + y].
class JavaExpressionIndexSelector : public JavaExpressionSelector {
public:
// Takes ownership over the "index" expression subtree.
explicit JavaExpressionIndexSelector(JavaExpression* index) : index_(index) {
}
void Print(std::ostream* os, bool concise) override;
bool TryGetTypeName(string* name) const override { return false; }
CompiledExpression CreateEvaluator() override;
private:
std::unique_ptr<JavaExpression> index_;
DISALLOW_COPY_AND_ASSIGN(JavaExpressionIndexSelector);
};
// Selector for a class member.
class JavaExpressionMemberSelector : public JavaExpressionSelector {
public:
explicit JavaExpressionMemberSelector(const string& member)
: member_(member) {
}
void Print(std::ostream* os, bool concise) override;
bool TryGetTypeName(string* name) const override;
CompiledExpression CreateEvaluator() override;
private:
const string member_;
DISALLOW_COPY_AND_ASSIGN(JavaExpressionMemberSelector);
};
// List of arguments for method invocation.
class MethodArguments {
public:
// Empty arguments list.
MethodArguments() {}
// Single argument. Takes ownership over "argument".
MethodArguments(JavaExpression* argument, MethodArguments* tail) {
if (tail) {
arguments_.swap(tail->arguments_);
delete tail;
}
arguments_.push_front(std::unique_ptr<JavaExpression>(argument));
}
std::list<std::unique_ptr<JavaExpression>>::iterator begin() {
return arguments_.begin();
}
std::list<std::unique_ptr<JavaExpression>>::iterator end() {
return arguments_.end();
}
private:
std::list<std::unique_ptr<JavaExpression>> arguments_;
DISALLOW_COPY_AND_ASSIGN(MethodArguments);
};
// Represents method call (with arguments). The method call can be either
// direct like f(1) or through selectors like my.util.f(1) or a.getY().f(1).
// In case of direct method call, "source_" will be null.
class MethodCallExpression : public JavaExpressionSelector {
public:
// Takes ownership over "method" and "arguments".
MethodCallExpression(const string& method, MethodArguments* arguments)
: method_(method),
arguments_(std::unique_ptr<MethodArguments>(arguments)) {
}
void Print(std::ostream* os, bool concise) override;
bool TryGetTypeName(string* name) const override { return false; }
CompiledExpression CreateEvaluator() override;
private:
const string method_;
std::unique_ptr<MethodArguments> arguments_;
DISALLOW_COPY_AND_ASSIGN(MethodCallExpression);
};
} // namespace cdbg
} // namespace devtools
#endif // DEVTOOLS_CDBG_DEBUGLETS_JAVA_JAVA_EXPRESSION_H_