forked from ethereum/solidity
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathExpressionCompiler.cpp
2984 lines (2760 loc) · 105 KB
/
ExpressionCompiler.cpp
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
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
This file is part of solidity.
solidity is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
solidity is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with solidity. If not, see <http://www.gnu.org/licenses/>.
*/
// SPDX-License-Identifier: GPL-3.0
/**
* @author Christian <[email protected]>
* @date 2014
* Solidity AST to EVM bytecode compiler for expressions.
*/
#include <libsolidity/codegen/ExpressionCompiler.h>
#include <libsolidity/codegen/ReturnInfo.h>
#include <libsolidity/codegen/CompilerContext.h>
#include <libsolidity/codegen/CompilerUtils.h>
#include <libsolidity/codegen/LValue.h>
#include <libsolidity/ast/AST.h>
#include <libsolidity/ast/ASTUtils.h>
#include <libsolidity/ast/TypeProvider.h>
#include <libevmasm/GasMeter.h>
#include <libsolutil/Common.h>
#include <libsolutil/FunctionSelector.h>
#include <libsolutil/Keccak256.h>
#include <libsolutil/Whiskers.h>
#include <libsolutil/StackTooDeepString.h>
#include <boost/algorithm/string/replace.hpp>
#include <numeric>
#include <utility>
using namespace solidity;
using namespace solidity::evmasm;
using namespace solidity::frontend;
using namespace solidity::langutil;
using namespace solidity::util;
namespace
{
Type const* closestType(Type const* _type, Type const* _targetType, bool _isShiftOp)
{
if (_isShiftOp)
return _type->mobileType();
else if (auto const* tupleType = dynamic_cast<TupleType const*>(_type))
{
solAssert(_targetType, "");
TypePointers const& targetComponents = dynamic_cast<TupleType const&>(*_targetType).components();
solAssert(tupleType->components().size() == targetComponents.size(), "");
TypePointers tempComponents(targetComponents.size());
for (size_t i = 0; i < targetComponents.size(); ++i)
{
if (tupleType->components()[i] && targetComponents[i])
{
tempComponents[i] = closestType(tupleType->components()[i], targetComponents[i], _isShiftOp);
solAssert(tempComponents[i], "");
}
}
return TypeProvider::tuple(std::move(tempComponents));
}
else
return _targetType->dataStoredIn(DataLocation::Storage) ? _type->mobileType() : _targetType;
}
}
void ExpressionCompiler::compile(Expression const& _expression)
{
_expression.accept(*this);
}
void ExpressionCompiler::appendStateVariableInitialization(VariableDeclaration const& _varDecl)
{
if (!_varDecl.value())
return;
Type const* type = _varDecl.value()->annotation().type;
solAssert(!!type, "Type information not available.");
CompilerContext::LocationSetter locationSetter(m_context, _varDecl);
_varDecl.value()->accept(*this);
if (_varDecl.annotation().type->dataStoredIn(DataLocation::Storage))
{
// reference type, only convert value to mobile type and do final conversion in storeValue.
auto mt = type->mobileType();
solAssert(mt, "");
utils().convertType(*type, *mt);
type = mt;
}
else
{
utils().convertType(*type, *_varDecl.annotation().type);
type = _varDecl.annotation().type;
}
if (_varDecl.immutable())
ImmutableItem(m_context, _varDecl).storeValue(*type, _varDecl.location(), true);
else
StorageItem(m_context, _varDecl).storeValue(*type, _varDecl.location(), true);
}
void ExpressionCompiler::appendConstStateVariableAccessor(VariableDeclaration const& _varDecl)
{
solAssert(_varDecl.isConstant(), "");
acceptAndConvert(*_varDecl.value(), *_varDecl.annotation().type);
// append return
m_context << dupInstruction(_varDecl.annotation().type->sizeOnStack() + 1);
m_context.appendJump(evmasm::AssemblyItem::JumpType::OutOfFunction);
}
void ExpressionCompiler::appendStateVariableAccessor(VariableDeclaration const& _varDecl)
{
solAssert(!_varDecl.isConstant(), "");
CompilerContext::LocationSetter locationSetter(m_context, _varDecl);
FunctionType accessorType(_varDecl);
TypePointers paramTypes = accessorType.parameterTypes();
if (_varDecl.immutable())
solAssert(paramTypes.empty(), "");
m_context.adjustStackOffset(static_cast<int>(1 + CompilerUtils::sizeOnStack(paramTypes)));
if (!_varDecl.immutable())
{
// retrieve the position of the variable
auto const& location = m_context.storageLocationOfVariable(_varDecl);
m_context << location.first << u256(location.second);
}
Type const* returnType = _varDecl.annotation().type;
for (size_t i = 0; i < paramTypes.size(); ++i)
{
if (auto mappingType = dynamic_cast<MappingType const*>(returnType))
{
solAssert(CompilerUtils::freeMemoryPointer >= 0x40, "");
// pop offset
m_context << Instruction::POP;
if (paramTypes[i]->isDynamicallySized())
{
solAssert(
dynamic_cast<ArrayType const&>(*paramTypes[i]).isByteArrayOrString(),
"Expected string or byte array for mapping key type"
);
// stack: <keys..> <slot position>
// copy key[i] to top.
utils().copyToStackTop(static_cast<unsigned>(paramTypes.size() - i + 1), 1);
m_context.appendInlineAssembly(R"({
let key_len := mload(key_ptr)
// Temp. use the memory after the array data for the slot
// position
let post_data_ptr := add(key_ptr, add(key_len, 0x20))
let orig_data := mload(post_data_ptr)
mstore(post_data_ptr, slot_pos)
let hash := keccak256(add(key_ptr, 0x20), add(key_len, 0x20))
mstore(post_data_ptr, orig_data)
slot_pos := hash
})", {"slot_pos", "key_ptr"});
m_context << Instruction::POP;
}
else
{
solAssert(paramTypes[i]->isValueType(), "Expected value type for mapping key");
// move storage offset to memory.
utils().storeInMemory(32);
// move key to memory.
utils().copyToStackTop(static_cast<unsigned>(paramTypes.size() - i), 1);
utils().storeInMemory(0);
m_context << u256(64) << u256(0);
m_context << Instruction::KECCAK256;
}
// push offset
m_context << u256(0);
returnType = mappingType->valueType();
}
else if (auto arrayType = dynamic_cast<ArrayType const*>(returnType))
{
// pop offset
m_context << Instruction::POP;
utils().copyToStackTop(static_cast<unsigned>(paramTypes.size() - i + 1), 1);
ArrayUtils(m_context).retrieveLength(*arrayType, 1);
// Stack: ref [length] index length
// check out-of-bounds access
m_context << Instruction::DUP2 << Instruction::LT;
auto tag = m_context.appendConditionalJump();
m_context << u256(0) << Instruction::DUP1 << Instruction::REVERT;
m_context << tag;
ArrayUtils(m_context).accessIndex(*arrayType, false);
returnType = arrayType->baseType();
}
else
solAssert(false, "Index access is allowed only for \"mapping\" and \"array\" types.");
}
// remove index arguments.
if (paramTypes.size() == 1)
m_context << Instruction::SWAP2 << Instruction::POP << Instruction::SWAP1;
else if (paramTypes.size() >= 2)
{
m_context << swapInstruction(static_cast<unsigned>(paramTypes.size()));
m_context << Instruction::POP;
m_context << swapInstruction(static_cast<unsigned>(paramTypes.size()));
utils().popStackSlots(paramTypes.size() - 1);
}
unsigned retSizeOnStack = 0;
auto returnTypes = accessorType.returnParameterTypes();
solAssert(returnTypes.size() >= 1, "");
if (StructType const* structType = dynamic_cast<StructType const*>(returnType))
{
solAssert(!_varDecl.immutable(), "");
// remove offset
m_context << Instruction::POP;
auto const& names = accessorType.returnParameterNames();
// struct
for (size_t i = 0; i < names.size(); ++i)
{
if (returnTypes[i]->category() == Type::Category::Mapping)
continue;
if (auto arrayType = dynamic_cast<ArrayType const*>(returnTypes[i]))
if (!arrayType->isByteArrayOrString())
continue;
std::pair<u256, unsigned> const& offsets = structType->storageOffsetsOfMember(names[i]);
m_context << Instruction::DUP1 << u256(offsets.first) << Instruction::ADD << u256(offsets.second);
Type const* memberType = structType->memberType(names[i]);
StorageItem(m_context, *memberType).retrieveValue(SourceLocation(), true);
utils().convertType(*memberType, *returnTypes[i]);
utils().moveToStackTop(returnTypes[i]->sizeOnStack());
retSizeOnStack += returnTypes[i]->sizeOnStack();
}
// remove slot
m_context << Instruction::POP;
}
else
{
// simple value or array
solAssert(returnTypes.size() == 1, "");
if (_varDecl.immutable())
ImmutableItem(m_context, _varDecl).retrieveValue(SourceLocation());
else
StorageItem(m_context, *returnType).retrieveValue(SourceLocation(), true);
utils().convertType(*returnType, *returnTypes.front());
retSizeOnStack = returnTypes.front()->sizeOnStack();
}
solAssert(retSizeOnStack == utils().sizeOnStack(returnTypes), "");
if (retSizeOnStack > 15)
BOOST_THROW_EXCEPTION(
StackTooDeepError() <<
errinfo_sourceLocation(_varDecl.location()) <<
util::errinfo_comment(util::stackTooDeepString)
);
m_context << dupInstruction(retSizeOnStack + 1);
m_context.appendJump(evmasm::AssemblyItem::JumpType::OutOfFunction);
}
bool ExpressionCompiler::visit(Conditional const& _condition)
{
CompilerContext::LocationSetter locationSetter(m_context, _condition);
_condition.condition().accept(*this);
evmasm::AssemblyItem trueTag = m_context.appendConditionalJump();
acceptAndConvert(_condition.falseExpression(), *_condition.annotation().type);
evmasm::AssemblyItem endTag = m_context.appendJumpToNew();
m_context << trueTag;
int offset = static_cast<int>(_condition.annotation().type->sizeOnStack());
m_context.adjustStackOffset(-offset);
acceptAndConvert(_condition.trueExpression(), *_condition.annotation().type);
m_context << endTag;
return false;
}
bool ExpressionCompiler::visit(Assignment const& _assignment)
{
CompilerContext::LocationSetter locationSetter(m_context, _assignment);
Token op = _assignment.assignmentOperator();
Token binOp = op == Token::Assign ? op : TokenTraits::AssignmentToBinaryOp(op);
Type const& leftType = *_assignment.leftHandSide().annotation().type;
if (leftType.category() == Type::Category::Tuple)
{
solAssert(*_assignment.annotation().type == TupleType(), "");
solAssert(op == Token::Assign, "");
}
else
solAssert(*_assignment.annotation().type == leftType, "");
bool cleanupNeeded = false;
if (op != Token::Assign)
cleanupNeeded = cleanupNeededForOp(leftType.category(), binOp, m_context.arithmetic());
_assignment.rightHandSide().accept(*this);
// Perform some conversion already. This will convert storage types to memory and literals
// to their actual type, but will not convert e.g. memory to storage.
Type const* rightIntermediateType = closestType(
_assignment.rightHandSide().annotation().type,
_assignment.leftHandSide().annotation().type,
op != Token::Assign && TokenTraits::isShiftOp(binOp)
);
solAssert(rightIntermediateType, "");
utils().convertType(*_assignment.rightHandSide().annotation().type, *rightIntermediateType, cleanupNeeded);
_assignment.leftHandSide().accept(*this);
solAssert(!!m_currentLValue, "LValue not retrieved.");
if (op == Token::Assign)
m_currentLValue->storeValue(*rightIntermediateType, _assignment.location());
else // compound assignment
{
solAssert(binOp != Token::Exp, "Compound exp is not possible.");
solAssert(leftType.isValueType(), "Compound operators only available for value types.");
unsigned lvalueSize = m_currentLValue->sizeOnStack();
unsigned itemSize = _assignment.annotation().type->sizeOnStack();
if (lvalueSize > 0)
{
utils().copyToStackTop(lvalueSize + itemSize, itemSize);
utils().copyToStackTop(itemSize + lvalueSize, lvalueSize);
// value lvalue_ref value lvalue_ref
}
m_currentLValue->retrieveValue(_assignment.location(), true);
utils().convertType(leftType, leftType, cleanupNeeded);
if (TokenTraits::isShiftOp(binOp))
appendShiftOperatorCode(binOp, leftType, *rightIntermediateType);
else
{
solAssert(leftType == *rightIntermediateType, "");
appendOrdinaryBinaryOperatorCode(binOp, leftType);
}
if (lvalueSize > 0)
{
if (itemSize + lvalueSize > 16)
BOOST_THROW_EXCEPTION(
StackTooDeepError() <<
errinfo_sourceLocation(_assignment.location()) <<
util::errinfo_comment(util::stackTooDeepString)
);
// value [lvalue_ref] updated_value
for (unsigned i = 0; i < itemSize; ++i)
m_context << swapInstruction(itemSize + lvalueSize) << Instruction::POP;
}
m_currentLValue->storeValue(*_assignment.annotation().type, _assignment.location());
}
m_currentLValue.reset();
return false;
}
bool ExpressionCompiler::visit(TupleExpression const& _tuple)
{
if (_tuple.isInlineArray())
{
ArrayType const& arrayType = dynamic_cast<ArrayType const&>(*_tuple.annotation().type);
solAssert(!arrayType.isDynamicallySized(), "Cannot create dynamically sized inline array.");
utils().allocateMemory(std::max(u256(32u), arrayType.memoryDataSize()));
m_context << Instruction::DUP1;
for (auto const& component: _tuple.components())
{
acceptAndConvert(*component, *arrayType.baseType(), true);
utils().storeInMemoryDynamic(*arrayType.baseType(), true);
}
m_context << Instruction::POP;
}
else
{
std::vector<std::unique_ptr<LValue>> lvalues;
for (auto const& component: _tuple.components())
if (component)
{
component->accept(*this);
if (_tuple.annotation().willBeWrittenTo)
{
solAssert(!!m_currentLValue, "");
lvalues.push_back(std::move(m_currentLValue));
}
}
else if (_tuple.annotation().willBeWrittenTo)
lvalues.push_back(std::unique_ptr<LValue>());
if (_tuple.annotation().willBeWrittenTo)
{
if (_tuple.components().size() == 1)
m_currentLValue = std::move(lvalues[0]);
else
m_currentLValue = std::make_unique<TupleObject>(m_context, std::move(lvalues));
}
}
return false;
}
bool ExpressionCompiler::visit(UnaryOperation const& _unaryOperation)
{
CompilerContext::LocationSetter locationSetter(m_context, _unaryOperation);
FunctionDefinition const* function = *_unaryOperation.annotation().userDefinedFunction;
if (function)
{
solAssert(function->isFree());
FunctionType const* functionType = _unaryOperation.userDefinedFunctionType();
solAssert(functionType);
solAssert(functionType->parameterTypes().size() == 1);
solAssert(functionType->returnParameterTypes().size() == 1);
solAssert(functionType->kind() == FunctionType::Kind::Internal);
evmasm::AssemblyItem returnLabel = m_context.pushNewTag();
acceptAndConvert(
_unaryOperation.subExpression(),
*functionType->parameterTypes()[0],
false // _cleanupNeeded
);
m_context << m_context.functionEntryLabel(*function).pushTag();
m_context.appendJump(evmasm::AssemblyItem::JumpType::IntoFunction);
m_context << returnLabel;
unsigned parameterSize = CompilerUtils::sizeOnStack(functionType->parameterTypes());
unsigned returnParametersSize = CompilerUtils::sizeOnStack(functionType->returnParameterTypes());
// callee adds return parameters, but removes arguments and return label
m_context.adjustStackOffset(static_cast<int>(returnParametersSize - parameterSize) - 1);
return false;
}
Type const& type = *_unaryOperation.annotation().type;
if (type.category() == Type::Category::RationalNumber)
{
m_context << type.literalValue(nullptr);
return false;
}
_unaryOperation.subExpression().accept(*this);
switch (_unaryOperation.getOperator())
{
case Token::Not: // !
m_context << Instruction::ISZERO;
break;
case Token::BitNot: // ~
m_context << Instruction::NOT;
break;
case Token::Delete: // delete
solAssert(!!m_currentLValue, "LValue not retrieved.");
m_currentLValue->setToZero(_unaryOperation.location());
m_currentLValue.reset();
break;
case Token::Inc: // ++ (pre- or postfix)
case Token::Dec: // -- (pre- or postfix)
solAssert(!!m_currentLValue, "LValue not retrieved.");
solUnimplementedAssert(
type.category() != Type::Category::FixedPoint,
"Not yet implemented - FixedPointType."
);
m_currentLValue->retrieveValue(_unaryOperation.location());
if (!_unaryOperation.isPrefixOperation())
{
// store value for later
solUnimplementedAssert(type.sizeOnStack() == 1, "Stack size != 1 not implemented.");
m_context << Instruction::DUP1;
if (m_currentLValue->sizeOnStack() > 0)
for (unsigned i = 1 + m_currentLValue->sizeOnStack(); i > 0; --i)
m_context << swapInstruction(i);
}
if (_unaryOperation.getOperator() == Token::Inc)
{
if (m_context.arithmetic() == Arithmetic::Checked)
m_context.callYulFunction(m_context.utilFunctions().incrementCheckedFunction(type), 1, 1);
else
{
m_context << u256(1);
m_context << Instruction::ADD;
}
}
else
{
if (m_context.arithmetic() == Arithmetic::Checked)
m_context.callYulFunction(m_context.utilFunctions().decrementCheckedFunction(type), 1, 1);
else
{
m_context << u256(1);
m_context << Instruction::SWAP1 << Instruction::SUB;
}
}
// Stack for prefix: [ref...] (*ref)+-1
// Stack for postfix: *ref [ref...] (*ref)+-1
for (unsigned i = m_currentLValue->sizeOnStack(); i > 0; --i)
m_context << swapInstruction(i);
m_currentLValue->storeValue(
*_unaryOperation.annotation().type, _unaryOperation.location(),
!_unaryOperation.isPrefixOperation());
m_currentLValue.reset();
break;
case Token::Add: // +
// According to SyntaxChecker...
solAssert(false, "Use of unary + is disallowed.");
case Token::Sub: // -
solUnimplementedAssert(
type.category() != Type::Category::FixedPoint,
"Not yet implemented - FixedPointType."
);
if (m_context.arithmetic() == Arithmetic::Checked)
m_context.callYulFunction(m_context.utilFunctions().negateNumberCheckedFunction(type), 1, 1);
else
m_context << u256(0) << Instruction::SUB;
break;
default:
solAssert(false, "Invalid unary operator: " + std::string(TokenTraits::toString(_unaryOperation.getOperator())));
}
return false;
}
bool ExpressionCompiler::visit(BinaryOperation const& _binaryOperation)
{
CompilerContext::LocationSetter locationSetter(m_context, _binaryOperation);
Expression const& leftExpression = _binaryOperation.leftExpression();
Expression const& rightExpression = _binaryOperation.rightExpression();
FunctionDefinition const* function = *_binaryOperation.annotation().userDefinedFunction;
if (function)
{
solAssert(function->isFree());
FunctionType const* functionType = _binaryOperation.userDefinedFunctionType();
solAssert(functionType);
solAssert(functionType->parameterTypes().size() == 2);
solAssert(functionType->returnParameterTypes().size() == 1);
solAssert(functionType->kind() == FunctionType::Kind::Internal);
evmasm::AssemblyItem returnLabel = m_context.pushNewTag();
acceptAndConvert(
leftExpression,
*functionType->parameterTypes()[0],
false // _cleanupNeeded
);
acceptAndConvert(
rightExpression,
*functionType->parameterTypes()[1],
false // _cleanupNeeded
);
m_context << m_context.functionEntryLabel(*function).pushTag();
m_context.appendJump(evmasm::AssemblyItem::JumpType::IntoFunction);
m_context << returnLabel;
unsigned parameterSize = CompilerUtils::sizeOnStack(functionType->parameterTypes());
unsigned returnParametersSize = CompilerUtils::sizeOnStack(functionType->returnParameterTypes());
// callee adds return parameters, but removes arguments and return label
m_context.adjustStackOffset(static_cast<int>(returnParametersSize - parameterSize) - 1);
return false;
}
solAssert(!!_binaryOperation.annotation().commonType);
Type const* commonType = _binaryOperation.annotation().commonType;
Token const c_op = _binaryOperation.getOperator();
if (c_op == Token::And || c_op == Token::Or) // special case: short-circuiting
appendAndOrOperatorCode(_binaryOperation);
else if (commonType->category() == Type::Category::RationalNumber)
m_context << commonType->literalValue(nullptr);
else
{
bool cleanupNeeded = cleanupNeededForOp(commonType->category(), c_op, m_context.arithmetic());
Type const* leftTargetType = commonType;
Type const* rightTargetType =
TokenTraits::isShiftOp(c_op) || c_op == Token::Exp ?
rightExpression.annotation().type->mobileType() :
commonType;
solAssert(rightTargetType, "");
// for commutative operators, push the literal as late as possible to allow improved optimization
auto isLiteral = [](Expression const& _e)
{
return dynamic_cast<Literal const*>(&_e) || _e.annotation().type->category() == Type::Category::RationalNumber;
};
bool swap = m_optimiseOrderLiterals && TokenTraits::isCommutativeOp(c_op) && isLiteral(rightExpression) && !isLiteral(leftExpression);
if (swap)
{
acceptAndConvert(leftExpression, *leftTargetType, cleanupNeeded);
acceptAndConvert(rightExpression, *rightTargetType, cleanupNeeded);
}
else
{
acceptAndConvert(rightExpression, *rightTargetType, cleanupNeeded);
acceptAndConvert(leftExpression, *leftTargetType, cleanupNeeded);
}
if (TokenTraits::isShiftOp(c_op))
// shift only cares about the signedness of both sides
appendShiftOperatorCode(c_op, *leftTargetType, *rightTargetType);
else if (c_op == Token::Exp)
appendExpOperatorCode(*leftTargetType, *rightTargetType);
else if (TokenTraits::isCompareOp(c_op))
appendCompareOperatorCode(c_op, *commonType);
else
appendOrdinaryBinaryOperatorCode(c_op, *commonType);
}
// do not visit the child nodes, we already did that explicitly
return false;
}
bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
{
auto functionCallKind = *_functionCall.annotation().kind;
CompilerContext::LocationSetter locationSetter(m_context, _functionCall);
if (functionCallKind == FunctionCallKind::TypeConversion)
{
solAssert(_functionCall.arguments().size() == 1, "");
solAssert(_functionCall.names().empty(), "");
auto const& expression = *_functionCall.arguments().front();
auto const& targetType = *_functionCall.annotation().type;
if (auto const* typeType = dynamic_cast<TypeType const*>(expression.annotation().type))
if (auto const* addressType = dynamic_cast<AddressType const*>(&targetType))
{
auto const* contractType = dynamic_cast<ContractType const*>(typeType->actualType());
solAssert(
contractType &&
contractType->contractDefinition().isLibrary() &&
addressType->stateMutability() == StateMutability::NonPayable,
""
);
m_context.appendLibraryAddress(contractType->contractDefinition().fullyQualifiedName());
return false;
}
acceptAndConvert(expression, targetType);
return false;
}
FunctionTypePointer functionType;
if (functionCallKind == FunctionCallKind::StructConstructorCall)
{
auto const& type = dynamic_cast<TypeType const&>(*_functionCall.expression().annotation().type);
auto const& structType = dynamic_cast<StructType const&>(*type.actualType());
functionType = structType.constructorType();
}
else
functionType = dynamic_cast<FunctionType const*>(_functionCall.expression().annotation().type);
TypePointers parameterTypes = functionType->parameterTypes();
std::vector<ASTPointer<Expression const>> const& arguments = _functionCall.sortedArguments();
if (functionCallKind == FunctionCallKind::StructConstructorCall)
{
TypeType const& type = dynamic_cast<TypeType const&>(*_functionCall.expression().annotation().type);
auto const& structType = dynamic_cast<StructType const&>(*type.actualType());
utils().allocateMemory(std::max(u256(32u), structType.memoryDataSize()));
m_context << Instruction::DUP1;
for (unsigned i = 0; i < arguments.size(); ++i)
{
acceptAndConvert(*arguments[i], *functionType->parameterTypes()[i]);
utils().storeInMemoryDynamic(*functionType->parameterTypes()[i]);
}
m_context << Instruction::POP;
}
else
{
FunctionType const& function = *functionType;
if (function.hasBoundFirstArgument())
solAssert(
function.kind() == FunctionType::Kind::DelegateCall ||
function.kind() == FunctionType::Kind::Internal ||
function.kind() == FunctionType::Kind::ArrayPush ||
function.kind() == FunctionType::Kind::ArrayPop,
"");
switch (function.kind())
{
case FunctionType::Kind::Declaration:
solAssert(false, "Attempted to generate code for calling a function definition.");
break;
case FunctionType::Kind::Internal:
{
// Calling convention: Caller pushes return address and arguments
// Callee removes them and pushes return values
evmasm::AssemblyItem returnLabel = m_context.pushNewTag();
for (unsigned i = 0; i < arguments.size(); ++i)
acceptAndConvert(*arguments[i], *function.parameterTypes()[i]);
_functionCall.expression().accept(*this);
unsigned parameterSize = CompilerUtils::sizeOnStack(function.parameterTypes());
if (function.hasBoundFirstArgument())
{
// stack: arg2, ..., argn, label, arg1
unsigned depth = parameterSize + 1;
utils().moveIntoStack(depth, function.selfType()->sizeOnStack());
parameterSize += function.selfType()->sizeOnStack();
}
if (m_context.runtimeContext())
// We have a runtime context, so we need the creation part.
utils().rightShiftNumberOnStack(32);
else
// Extract the runtime part.
m_context << ((u256(1) << 32) - 1) << Instruction::AND;
m_context.appendJump(evmasm::AssemblyItem::JumpType::IntoFunction);
m_context << returnLabel;
unsigned returnParametersSize = CompilerUtils::sizeOnStack(function.returnParameterTypes());
// callee adds return parameters, but removes arguments and return label
m_context.adjustStackOffset(static_cast<int>(returnParametersSize - parameterSize) - 1);
break;
}
case FunctionType::Kind::BareCall:
case FunctionType::Kind::BareDelegateCall:
case FunctionType::Kind::BareStaticCall:
solAssert(!_functionCall.annotation().tryCall, "");
[[fallthrough]];
case FunctionType::Kind::External:
case FunctionType::Kind::DelegateCall:
_functionCall.expression().accept(*this);
appendExternalFunctionCall(function, arguments, _functionCall.annotation().tryCall);
break;
case FunctionType::Kind::BareCallCode:
solAssert(false, "Callcode has been removed.");
case FunctionType::Kind::Creation:
{
_functionCall.expression().accept(*this);
// Stack: [salt], [value]
solAssert(!function.gasSet(), "Gas limit set for contract creation.");
solAssert(function.returnParameterTypes().size() == 1, "");
TypePointers argumentTypes;
for (auto const& arg: arguments)
{
arg->accept(*this);
argumentTypes.push_back(arg->annotation().type);
}
ContractDefinition const* contract =
&dynamic_cast<ContractType const&>(*function.returnParameterTypes().front()).contractDefinition();
utils().fetchFreeMemoryPointer();
utils().copyContractCodeToMemory(*contract, true);
utils().abiEncode(argumentTypes, function.parameterTypes());
// now on stack: [salt], [value], memory_end_ptr
// need: [salt], size, offset, value
if (function.saltSet())
{
m_context << dupInstruction(2 + (function.valueSet() ? 1 : 0));
m_context << Instruction::SWAP1;
}
// now: [salt], [value], [salt], memory_end_ptr
utils().toSizeAfterFreeMemoryPointer();
// now: [salt], [value], [salt], size, offset
if (function.valueSet())
m_context << dupInstruction(3 + (function.saltSet() ? 1 : 0));
else
m_context << u256(0);
// now: [salt], [value], [salt], size, offset, value
if (function.saltSet())
m_context << Instruction::CREATE2;
else
m_context << Instruction::CREATE;
// now: [salt], [value], address
if (function.valueSet())
m_context << swapInstruction(1) << Instruction::POP;
if (function.saltSet())
m_context << swapInstruction(1) << Instruction::POP;
// Check if zero (reverted)
m_context << Instruction::DUP1 << Instruction::ISZERO;
if (_functionCall.annotation().tryCall)
{
// If this is a try call, return "<address> 1" in the success case and
// "0" in the error case.
AssemblyItem errorCase = m_context.appendConditionalJump();
m_context << u256(1);
m_context << errorCase;
}
else
m_context.appendConditionalRevert(true);
break;
}
case FunctionType::Kind::SetGas:
{
// stack layout: contract_address function_id [gas] [value]
_functionCall.expression().accept(*this);
acceptAndConvert(*arguments.front(), *TypeProvider::uint256(), true);
// Note that function is not the original function, but the ".gas" function.
// Its values of gasSet and valueSet is equal to the original function's though.
unsigned stackDepth = (function.gasSet() ? 1u : 0u) + (function.valueSet() ? 1u : 0u);
if (stackDepth > 0)
m_context << swapInstruction(stackDepth);
if (function.gasSet())
m_context << Instruction::POP;
break;
}
case FunctionType::Kind::SetValue:
// stack layout: contract_address function_id [gas] [value]
_functionCall.expression().accept(*this);
// Note that function is not the original function, but the ".value" function.
// Its values of gasSet and valueSet is equal to the original function's though.
if (function.valueSet())
m_context << Instruction::POP;
arguments.front()->accept(*this);
break;
case FunctionType::Kind::Send:
case FunctionType::Kind::Transfer:
{
_functionCall.expression().accept(*this);
// Provide the gas stipend manually at first because we may send zero ether.
// Will be zeroed if we send more than zero ether.
m_context << u256(evmasm::GasCosts::callStipend);
acceptAndConvert(*arguments.front(), *function.parameterTypes().front(), true);
// gas <- gas * !value
m_context << Instruction::SWAP1 << Instruction::DUP2;
m_context << Instruction::ISZERO << Instruction::MUL << Instruction::SWAP1;
FunctionType::Options callOptions;
callOptions.valueSet = true;
callOptions.gasSet = true;
appendExternalFunctionCall(
FunctionType(
TypePointers{},
TypePointers{},
strings(),
strings(),
FunctionType::Kind::BareCall,
StateMutability::NonPayable,
nullptr,
callOptions
),
{},
false
);
if (function.kind() == FunctionType::Kind::Transfer)
{
// Check if zero (out of stack or not enough balance).
m_context << Instruction::ISZERO;
// Revert message bubbles up.
m_context.appendConditionalRevert(true);
}
break;
}
case FunctionType::Kind::Selfdestruct:
acceptAndConvert(*arguments.front(), *function.parameterTypes().front(), true);
m_context << Instruction::SELFDESTRUCT;
break;
case FunctionType::Kind::Revert:
{
if (arguments.empty())
m_context.appendRevert();
else
{
// function-sel(Error(string)) + encoding
solAssert(arguments.size() == 1, "");
solAssert(function.parameterTypes().size() == 1, "");
if (m_context.revertStrings() == RevertStrings::Strip)
{
if (!*arguments.front()->annotation().isPure)
{
arguments.front()->accept(*this);
utils().popStackElement(*arguments.front()->annotation().type);
}
m_context.appendRevert();
}
else
{
arguments.front()->accept(*this);
utils().revertWithStringData(*arguments.front()->annotation().type);
}
}
break;
}
case FunctionType::Kind::KECCAK256:
{
solAssert(arguments.size() == 1, "");
solAssert(!function.padArguments(), "");
Type const* argType = arguments.front()->annotation().type;
solAssert(argType, "");
arguments.front()->accept(*this);
if (auto const* stringLiteral = dynamic_cast<StringLiteralType const*>(argType))
// Optimization: Compute keccak256 on string literals at compile-time.
m_context << u256(keccak256(stringLiteral->value()));
else if (*argType == *TypeProvider::bytesMemory() || *argType == *TypeProvider::stringMemory())
{
// Optimization: If type is bytes or string, then do not encode,
// but directly compute keccak256 on memory.
ArrayUtils(m_context).retrieveLength(*TypeProvider::bytesMemory());
m_context << Instruction::SWAP1 << u256(0x20) << Instruction::ADD;
m_context << Instruction::KECCAK256;
}
else
{
utils().fetchFreeMemoryPointer();
utils().packedEncode({argType}, TypePointers());
utils().toSizeAfterFreeMemoryPointer();
m_context << Instruction::KECCAK256;
}
break;
}
case FunctionType::Kind::Event:
{
_functionCall.expression().accept(*this);
auto const& event = dynamic_cast<EventDefinition const&>(function.declaration());
unsigned numIndexed = 0;
TypePointers paramTypes = function.parameterTypes();
// All indexed arguments go to the stack
for (size_t arg = arguments.size(); arg > 0; --arg)
if (event.parameters()[arg - 1]->isIndexed())
{
++numIndexed;
arguments[arg - 1]->accept(*this);
if (auto const& referenceType = dynamic_cast<ReferenceType const*>(paramTypes[arg - 1]))
{
utils().fetchFreeMemoryPointer();
utils().packedEncode(
{arguments[arg - 1]->annotation().type},
{referenceType}
);
utils().toSizeAfterFreeMemoryPointer();
m_context << Instruction::KECCAK256;
}
else
{
solAssert(paramTypes[arg - 1]->isValueType(), "");
if (auto functionType = dynamic_cast<FunctionType const*>(paramTypes[arg - 1]))
{
auto argumentType =
dynamic_cast<FunctionType const*>(arguments[arg-1]->annotation().type);
solAssert(
argumentType &&
functionType->kind() == FunctionType::Kind::External &&
argumentType->kind() == FunctionType::Kind::External &&
!argumentType->hasBoundFirstArgument(),
""
);
utils().combineExternalFunctionType(true);
}
else
utils().convertType(
*arguments[arg - 1]->annotation().type,
*paramTypes[arg - 1],
true
);
}
}
if (!event.isAnonymous())
{
m_context << u256(h256::Arith(keccak256(function.externalSignature())));
++numIndexed;
}
solAssert(numIndexed <= 4, "Too many indexed arguments.");
// Copy all non-indexed arguments to memory (data)
// Memory position is only a hack and should be removed once we have free memory pointer.
TypePointers nonIndexedArgTypes;
TypePointers nonIndexedParamTypes;
for (unsigned arg = 0; arg < arguments.size(); ++arg)
if (!event.parameters()[arg]->isIndexed())
{
arguments[arg]->accept(*this);
nonIndexedArgTypes.push_back(arguments[arg]->annotation().type);
nonIndexedParamTypes.push_back(paramTypes[arg]);
}
utils().fetchFreeMemoryPointer();
utils().abiEncode(nonIndexedArgTypes, nonIndexedParamTypes);
// need: topic1 ... topicn memsize memstart
utils().toSizeAfterFreeMemoryPointer();
m_context << logInstruction(numIndexed);
break;
}
case FunctionType::Kind::Error:
{
_functionCall.expression().accept(*this);
std::vector<Type const*> argumentTypes;
for (ASTPointer<Expression const> const& arg: _functionCall.sortedArguments())
{
arg->accept(*this);
argumentTypes.push_back(arg->annotation().type);
}
solAssert(dynamic_cast<ErrorDefinition const*>(&function.declaration()), "");