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
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
|
#include "generate_java.h"
#include "AST.h"
#include "Type.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// =================================================
class VariableFactory
{
public:
VariableFactory(const string& base); // base must be short
Variable* Get(Type* type);
Variable* Get(int index);
private:
vector<Variable*> m_vars;
string m_base;
int m_index;
};
VariableFactory::VariableFactory(const string& base)
:m_base(base),
m_index(0)
{
}
Variable*
VariableFactory::Get(Type* type)
{
char name[100];
sprintf(name, "%s%d", m_base.c_str(), m_index);
m_index++;
Variable* v = new Variable(type, name);
m_vars.push_back(v);
return v;
}
Variable*
VariableFactory::Get(int index)
{
return m_vars[index];
}
// =================================================
class StubClass : public Class
{
public:
StubClass(Type* type, Type* interfaceType);
virtual ~StubClass();
Variable* transact_code;
Variable* transact_data;
Variable* transact_reply;
Variable* transact_flags;
SwitchStatement* transact_switch;
private:
void make_as_interface(Type* interfaceType);
};
StubClass::StubClass(Type* type, Type* interfaceType)
:Class()
{
this->comment = "/** Local-side IPC implementation stub class. */";
this->modifiers = PUBLIC | ABSTRACT | STATIC;
this->what = Class::CLASS;
this->type = type;
this->extends = BINDER_NATIVE_TYPE;
this->interfaces.push_back(interfaceType);
// descriptor
Field* descriptor = new Field(STATIC | FINAL | PRIVATE,
new Variable(STRING_TYPE, "DESCRIPTOR"));
descriptor->value = "\"" + interfaceType->QualifiedName() + "\"";
this->elements.push_back(descriptor);
// ctor
Method* ctor = new Method;
ctor->modifiers = PUBLIC;
ctor->comment = "/** Construct the stub at attach it to the "
"interface. */";
ctor->name = "Stub";
ctor->statements = new StatementBlock;
MethodCall* attach = new MethodCall(THIS_VALUE, "attachInterface",
2, THIS_VALUE, new LiteralExpression("DESCRIPTOR"));
ctor->statements->Add(attach);
this->elements.push_back(ctor);
// asInterface
make_as_interface(interfaceType);
// asBinder
Method* asBinder = new Method;
asBinder->modifiers = PUBLIC;
asBinder->returnType = IBINDER_TYPE;
asBinder->name = "asBinder";
asBinder->statements = new StatementBlock;
asBinder->statements->Add(new ReturnStatement(THIS_VALUE));
this->elements.push_back(asBinder);
// onTransact
this->transact_code = new Variable(INT_TYPE, "code");
this->transact_data = new Variable(PARCEL_TYPE, "data");
this->transact_reply = new Variable(PARCEL_TYPE, "reply");
this->transact_flags = new Variable(INT_TYPE, "flags");
Method* onTransact = new Method;
onTransact->modifiers = PUBLIC;
onTransact->returnType = BOOLEAN_TYPE;
onTransact->name = "onTransact";
onTransact->parameters.push_back(this->transact_code);
onTransact->parameters.push_back(this->transact_data);
onTransact->parameters.push_back(this->transact_reply);
onTransact->parameters.push_back(this->transact_flags);
onTransact->statements = new StatementBlock;
onTransact->exceptions.push_back(REMOTE_EXCEPTION_TYPE);
this->elements.push_back(onTransact);
this->transact_switch = new SwitchStatement(this->transact_code);
onTransact->statements->Add(this->transact_switch);
MethodCall* superCall = new MethodCall(SUPER_VALUE, "onTransact", 4,
this->transact_code, this->transact_data,
this->transact_reply, this->transact_flags);
onTransact->statements->Add(new ReturnStatement(superCall));
}
StubClass::~StubClass()
{
}
void
StubClass::make_as_interface(Type *interfaceType)
{
Variable* obj = new Variable(IBINDER_TYPE, "obj");
Method* m = new Method;
m->comment = "/**\n * Cast an IBinder object into an ";
m->comment += interfaceType->Name();
m->comment += " interface,\n";
m->comment += " * generating a proxy if needed.\n */";
m->modifiers = PUBLIC | STATIC;
m->returnType = interfaceType;
m->name = "asInterface";
m->parameters.push_back(obj);
m->statements = new StatementBlock;
IfStatement* ifstatement = new IfStatement();
ifstatement->expression = new Comparison(obj, "==", NULL_VALUE);
ifstatement->statements = new StatementBlock;
ifstatement->statements->Add(new ReturnStatement(NULL_VALUE));
m->statements->Add(ifstatement);
// IInterface iin = obj.queryLocalInterface(DESCRIPTOR)
MethodCall* queryLocalInterface = new MethodCall(obj, "queryLocalInterface");
queryLocalInterface->arguments.push_back(new LiteralExpression("DESCRIPTOR"));
IInterfaceType* iinType = new IInterfaceType();
Variable *iin = new Variable(iinType, "iin");
VariableDeclaration* iinVd = new VariableDeclaration(iin, queryLocalInterface, iinType);
m->statements->Add(iinVd);
// Ensure the instance type of the local object is as expected.
// One scenario where this is needed is if another package (with a
// different class loader) runs in the same process as the service.
// if (iin != null && iin instanceof <interfaceType>) return (<interfaceType>) iin;
Comparison* iinNotNull = new Comparison(iin, "!=", NULL_VALUE);
Comparison* instOfCheck = new Comparison(iin, " instanceof ",
new LiteralExpression(interfaceType->QualifiedName()));
IfStatement* instOfStatement = new IfStatement();
instOfStatement->expression = new Comparison(iinNotNull, "&&", instOfCheck);
instOfStatement->statements = new StatementBlock;
instOfStatement->statements->Add(new ReturnStatement(new Cast(interfaceType, iin)));
m->statements->Add(instOfStatement);
string proxyType = interfaceType->QualifiedName();
proxyType += ".Stub.Proxy";
NewExpression* ne = new NewExpression(NAMES.Find(proxyType));
ne->arguments.push_back(obj);
m->statements->Add(new ReturnStatement(ne));
this->elements.push_back(m);
}
// =================================================
class ProxyClass : public Class
{
public:
ProxyClass(Type* type, InterfaceType* interfaceType);
virtual ~ProxyClass();
Variable* mRemote;
bool mOneWay;
};
ProxyClass::ProxyClass(Type* type, InterfaceType* interfaceType)
:Class()
{
this->modifiers = PRIVATE | STATIC;
this->what = Class::CLASS;
this->type = type;
this->interfaces.push_back(interfaceType);
mOneWay = interfaceType->OneWay();
// IBinder mRemote
mRemote = new Variable(IBINDER_TYPE, "mRemote");
this->elements.push_back(new Field(PRIVATE, mRemote));
// Proxy()
Variable* remote = new Variable(IBINDER_TYPE, "remote");
Method* ctor = new Method;
ctor->name = "Proxy";
ctor->statements = new StatementBlock;
ctor->parameters.push_back(remote);
ctor->statements->Add(new Assignment(mRemote, remote));
this->elements.push_back(ctor);
// IBinder asBinder()
Method* asBinder = new Method;
asBinder->modifiers = PUBLIC;
asBinder->returnType = IBINDER_TYPE;
asBinder->name = "asBinder";
asBinder->statements = new StatementBlock;
asBinder->statements->Add(new ReturnStatement(mRemote));
this->elements.push_back(asBinder);
}
ProxyClass::~ProxyClass()
{
}
// =================================================
static string
gather_comments(extra_text_type* extra)
{
string s;
while (extra) {
if (extra->which == SHORT_COMMENT) {
s += extra->data;
}
else if (extra->which == LONG_COMMENT) {
s += "/*";
s += extra->data;
s += "*/";
}
extra = extra->next;
}
return s;
}
static string
append(const char* a, const char* b)
{
string s = a;
s += b;
return s;
}
static void
generate_new_array(Type* t, StatementBlock* addTo, Variable* v,
Variable* parcel)
{
Variable* len = new Variable(INT_TYPE, v->name + "_length");
addTo->Add(new VariableDeclaration(len, new MethodCall(parcel, "readInt")));
IfStatement* lencheck = new IfStatement();
lencheck->expression = new Comparison(len, "<", new LiteralExpression("0"));
lencheck->statements->Add(new Assignment(v, NULL_VALUE));
lencheck->elseif = new IfStatement();
lencheck->elseif->statements->Add(new Assignment(v,
new NewArrayExpression(t, len)));
addTo->Add(lencheck);
}
static void
generate_write_to_parcel(Type* t, StatementBlock* addTo, Variable* v,
Variable* parcel, int flags)
{
if (v->dimension == 0) {
t->WriteToParcel(addTo, v, parcel, flags);
}
if (v->dimension == 1) {
t->WriteArrayToParcel(addTo, v, parcel, flags);
}
}
static void
generate_create_from_parcel(Type* t, StatementBlock* addTo, Variable* v,
Variable* parcel)
{
if (v->dimension == 0) {
t->CreateFromParcel(addTo, v, parcel);
}
if (v->dimension == 1) {
t->CreateArrayFromParcel(addTo, v, parcel);
}
}
static void
generate_read_from_parcel(Type* t, StatementBlock* addTo, Variable* v,
Variable* parcel)
{
if (v->dimension == 0) {
t->ReadFromParcel(addTo, v, parcel);
}
if (v->dimension == 1) {
t->ReadArrayFromParcel(addTo, v, parcel);
}
}
static void
generate_method(const method_type* method, Class* interface,
StubClass* stubClass, ProxyClass* proxyClass, int index)
{
arg_type* arg;
int i;
bool hasOutParams = false;
const bool oneway = proxyClass->mOneWay || method->oneway;
// == the TRANSACT_ constant =============================================
string transactCodeName = "TRANSACTION_";
transactCodeName += method->name.data;
char transactCodeValue[50];
sprintf(transactCodeValue, "(IBinder.FIRST_CALL_TRANSACTION + %d)", index);
Field* transactCode = new Field(STATIC | FINAL,
new Variable(INT_TYPE, transactCodeName));
transactCode->value = transactCodeValue;
stubClass->elements.push_back(transactCode);
// == the declaration in the interface ===================================
Method* decl = new Method;
decl->comment = gather_comments(method->comments_token->extra);
decl->modifiers = PUBLIC;
decl->returnType = NAMES.Search(method->type.type.data);
decl->returnTypeDimension = method->type.dimension;
decl->name = method->name.data;
arg = method->args;
while (arg != NULL) {
decl->parameters.push_back(new Variable(
NAMES.Search(arg->type.type.data), arg->name.data,
arg->type.dimension));
arg = arg->next;
}
decl->exceptions.push_back(REMOTE_EXCEPTION_TYPE);
interface->elements.push_back(decl);
// == the stub method ====================================================
Case* c = new Case(transactCodeName);
MethodCall* realCall = new MethodCall(THIS_VALUE, method->name.data);
// interface token validation is the very first thing we do
c->statements->Add(new MethodCall(stubClass->transact_data,
"enforceInterface", 1, new LiteralExpression("DESCRIPTOR")));
// args
VariableFactory stubArgs("_arg");
arg = method->args;
while (arg != NULL) {
Type* t = NAMES.Search(arg->type.type.data);
Variable* v = stubArgs.Get(t);
v->dimension = arg->type.dimension;
c->statements->Add(new VariableDeclaration(v));
if (convert_direction(arg->direction.data) & IN_PARAMETER) {
generate_create_from_parcel(t, c->statements, v,
stubClass->transact_data);
} else {
if (arg->type.dimension == 0) {
c->statements->Add(new Assignment(
v, new NewExpression(v->type)));
}
else if (arg->type.dimension == 1) {
generate_new_array(v->type, c->statements, v,
stubClass->transact_data);
}
else {
fprintf(stderr, "aidl:internal error %s:%d\n", __FILE__,
__LINE__);
}
}
realCall->arguments.push_back(v);
arg = arg->next;
}
// the real call
Variable* _result = NULL;
if (0 == strcmp(method->type.type.data, "void")) {
c->statements->Add(realCall);
if (!oneway) {
// report that there were no exceptions
MethodCall* ex = new MethodCall(stubClass->transact_reply,
"writeNoException", 0);
c->statements->Add(ex);
}
} else {
_result = new Variable(decl->returnType, "_result",
decl->returnTypeDimension);
c->statements->Add(new VariableDeclaration(_result, realCall));
if (!oneway) {
// report that there were no exceptions
MethodCall* ex = new MethodCall(stubClass->transact_reply,
"writeNoException", 0);
c->statements->Add(ex);
}
// marshall the return value
generate_write_to_parcel(decl->returnType, c->statements, _result,
stubClass->transact_reply,
Type::PARCELABLE_WRITE_RETURN_VALUE);
}
// out parameters
i = 0;
arg = method->args;
while (arg != NULL) {
Type* t = NAMES.Search(arg->type.type.data);
Variable* v = stubArgs.Get(i++);
if (convert_direction(arg->direction.data) & OUT_PARAMETER) {
generate_write_to_parcel(t, c->statements, v,
stubClass->transact_reply,
Type::PARCELABLE_WRITE_RETURN_VALUE);
hasOutParams = true;
}
arg = arg->next;
}
// return true
c->statements->Add(new ReturnStatement(TRUE_VALUE));
stubClass->transact_switch->cases.push_back(c);
// == the proxy method ===================================================
Method* proxy = new Method;
proxy->comment = gather_comments(method->comments_token->extra);
proxy->modifiers = PUBLIC;
proxy->returnType = NAMES.Search(method->type.type.data);
proxy->returnTypeDimension = method->type.dimension;
proxy->name = method->name.data;
proxy->statements = new StatementBlock;
arg = method->args;
while (arg != NULL) {
proxy->parameters.push_back(new Variable(
NAMES.Search(arg->type.type.data), arg->name.data,
arg->type.dimension));
arg = arg->next;
}
proxy->exceptions.push_back(REMOTE_EXCEPTION_TYPE);
proxyClass->elements.push_back(proxy);
// the parcels
Variable* _data = new Variable(PARCEL_TYPE, "_data");
proxy->statements->Add(new VariableDeclaration(_data,
new MethodCall(PARCEL_TYPE, "obtain")));
Variable* _reply = NULL;
if (!oneway) {
_reply = new Variable(PARCEL_TYPE, "_reply");
proxy->statements->Add(new VariableDeclaration(_reply,
new MethodCall(PARCEL_TYPE, "obtain")));
}
// the return value
_result = NULL;
if (0 != strcmp(method->type.type.data, "void")) {
_result = new Variable(proxy->returnType, "_result",
method->type.dimension);
proxy->statements->Add(new VariableDeclaration(_result));
}
// try and finally
TryStatement* tryStatement = new TryStatement();
proxy->statements->Add(tryStatement);
FinallyStatement* finallyStatement = new FinallyStatement();
proxy->statements->Add(finallyStatement);
// the interface identifier token: the DESCRIPTOR constant, marshalled as a string
tryStatement->statements->Add(new MethodCall(_data, "writeInterfaceToken",
1, new LiteralExpression("DESCRIPTOR")));
// the parameters
arg = method->args;
while (arg != NULL) {
Type* t = NAMES.Search(arg->type.type.data);
Variable* v = new Variable(t, arg->name.data, arg->type.dimension);
int dir = convert_direction(arg->direction.data);
if (dir == OUT_PARAMETER && arg->type.dimension != 0) {
IfStatement* checklen = new IfStatement();
checklen->expression = new Comparison(v, "==", NULL_VALUE);
checklen->statements->Add(new MethodCall(_data, "writeInt", 1,
new LiteralExpression("-1")));
checklen->elseif = new IfStatement();
checklen->elseif->statements->Add(new MethodCall(_data, "writeInt",
1, new FieldVariable(v, "length")));
tryStatement->statements->Add(checklen);
}
else if (dir & IN_PARAMETER) {
generate_write_to_parcel(t, tryStatement->statements, v, _data, 0);
}
arg = arg->next;
}
// the transact call
MethodCall* call = new MethodCall(proxyClass->mRemote, "transact", 4,
new LiteralExpression("Stub." + transactCodeName),
_data, _reply ? _reply : NULL_VALUE,
new LiteralExpression(
oneway ? "IBinder.FLAG_ONEWAY" : "0"));
tryStatement->statements->Add(call);
// throw back exceptions.
if (_reply) {
MethodCall* ex = new MethodCall(_reply, "readException", 0);
tryStatement->statements->Add(ex);
}
// returning and cleanup
if (_reply != NULL) {
if (_result != NULL) {
generate_create_from_parcel(proxy->returnType,
tryStatement->statements, _result, _reply);
}
// the out/inout parameters
arg = method->args;
while (arg != NULL) {
Type* t = NAMES.Search(arg->type.type.data);
Variable* v = new Variable(t, arg->name.data, arg->type.dimension);
if (convert_direction(arg->direction.data) & OUT_PARAMETER) {
generate_read_from_parcel(t, tryStatement->statements,
v, _reply);
}
arg = arg->next;
}
finallyStatement->statements->Add(new MethodCall(_reply, "recycle"));
}
finallyStatement->statements->Add(new MethodCall(_data, "recycle"));
if (_result != NULL) {
proxy->statements->Add(new ReturnStatement(_result));
}
}
static void
generate_interface_descriptors(StubClass* stub, ProxyClass* proxy)
{
// the interface descriptor transaction handler
Case* c = new Case("INTERFACE_TRANSACTION");
c->statements->Add(new MethodCall(stub->transact_reply, "writeString",
1, new LiteralExpression("DESCRIPTOR")));
c->statements->Add(new ReturnStatement(TRUE_VALUE));
stub->transact_switch->cases.push_back(c);
// and the proxy-side method returning the descriptor directly
Method* getDesc = new Method;
getDesc->modifiers = PUBLIC;
getDesc->returnType = STRING_TYPE;
getDesc->returnTypeDimension = 0;
getDesc->name = "getInterfaceDescriptor";
getDesc->statements = new StatementBlock;
getDesc->statements->Add(new ReturnStatement(new LiteralExpression("DESCRIPTOR")));
proxy->elements.push_back(getDesc);
}
static Class*
generate_interface_class(const interface_type* iface)
{
InterfaceType* interfaceType = static_cast<InterfaceType*>(
NAMES.Find(iface->package, iface->name.data));
// the interface class
Class* interface = new Class;
interface->comment = gather_comments(iface->comments_token->extra);
interface->modifiers = PUBLIC;
interface->what = Class::INTERFACE;
interface->type = interfaceType;
interface->interfaces.push_back(IINTERFACE_TYPE);
// the stub inner class
StubClass* stub = new StubClass(
NAMES.Find(iface->package, append(iface->name.data, ".Stub").c_str()),
interfaceType);
interface->elements.push_back(stub);
// the proxy inner class
ProxyClass* proxy = new ProxyClass(
NAMES.Find(iface->package,
append(iface->name.data, ".Stub.Proxy").c_str()),
interfaceType);
stub->elements.push_back(proxy);
// stub and proxy support for getInterfaceDescriptor()
generate_interface_descriptors(stub, proxy);
// all the declared methods of the interface
int index = 0;
interface_item_type* item = iface->interface_items;
while (item != NULL) {
if (item->item_type == METHOD_TYPE) {
generate_method((method_type*)item, interface, stub, proxy, index);
}
item = item->next;
index++;
}
return interface;
}
int
generate_java(const string& filename, const string& originalSrc,
interface_type* iface)
{
Document* document = new Document;
document->comment = "";
if (iface->package) document->package = iface->package;
document->originalSrc = originalSrc;
document->classes.push_back(generate_interface_class(iface));
// printf("outputting... filename=%s\n", filename.c_str());
FILE* to;
if (filename == "-") {
to = stdout;
} else {
/* open file in binary mode to ensure that the tool produces the
* same output on all platforms !!
*/
to = fopen(filename.c_str(), "wb");
if (to == NULL) {
fprintf(stderr, "unable to open %s for write\n", filename.c_str());
return 1;
}
}
document->Write(to);
fclose(to);
return 0;
}
|