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Use the new maskToBitWidth function to ensure that the results of

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computations do not overflow the intended bit width.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33326 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-01-18 02:12:51 +00:00
parent 90935f608d
commit 65367b26bf
1 changed files with 15 additions and 10 deletions
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25
lib/ExecutionEngine/Interpreter/Execution.cpp
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@ -216,6 +216,7 @@ void Interpreter::initializeExecutionEngine() {
Dest.Int64Val = Src1.Int64Val OP Src2.Int64Val; \
else \
cerr << "Integer types > 64 bits not supported: " << *Ty << "\n"; \
maskToBitWidth(Dest, BitWidth); \
break; \
}
@ -234,6 +235,7 @@ void Interpreter::initializeExecutionEngine() {
cerr << "Integer types > 64 bits not supported: " << *Ty << "\n"; \
abort(); \
} \
maskToBitWidth(Dest, BitWidth); \
} else { \
cerr << "Unhandled type for " #OP " operator: " << *Ty << "\n"; \
abort(); \
@ -254,6 +256,7 @@ void Interpreter::initializeExecutionEngine() {
cerr << "Integer types > 64 bits not supported: " << *Ty << "\n"; \
abort(); \
} \
maskToBitWidth(Dest, BitWidth); \
} else { \
cerr << "Unhandled type for " #OP " operator: " << *Ty << "\n"; \
abort(); \
@ -397,6 +400,7 @@ static GenericValue executeXorInst(GenericValue Src1, GenericValue Src2,
cerr << "Integer types > 64 bits not supported: " << *Ty << "\n"; \
abort(); \
} \
maskToBitWidth(Dest, BitWidth); \
break; \
}
@ -417,6 +421,7 @@ static GenericValue executeXorInst(GenericValue Src1, GenericValue Src2,
cerr << "Integer types > 64 bits not supported: " << *Ty << "\n"; \
abort(); \
} \
maskToBitWidth(Dest, BitWidth); \
break; \
}
@ -1187,23 +1192,19 @@ static GenericValue executeShlInst(GenericValue Src1, GenericValue Src2,
GenericValue Dest;
if (const IntegerType *ITy = cast<IntegerType>(Ty)) {
unsigned BitWidth = ITy->getBitWidth();
uint32_t BitMask = (1ull << BitWidth) - 1;
if (BitWidth <= 8) {
if (BitWidth <= 8)
Dest.Int8Val = ((uint8_t)Src1.Int8Val) << ((uint32_t)Src2.Int8Val);
Dest.Int8Val &= BitMask;
} else if (BitWidth <= 16) {
else if (BitWidth <= 16)
Dest.Int16Val = ((uint16_t)Src1.Int16Val) << ((uint32_t)Src2.Int8Val);
Dest.Int16Val &= BitMask;
} else if (BitWidth <= 32) {
else if (BitWidth <= 32)
Dest.Int32Val = ((uint32_t)Src1.Int32Val) << ((uint32_t)Src2.Int8Val);
Dest.Int32Val &= BitMask;
} else if (BitWidth <= 64) {
else if (BitWidth <= 64)
Dest.Int64Val = ((uint64_t)Src1.Int64Val) << ((uint32_t)Src2.Int8Val);
Dest.Int64Val &= BitMask;
} else {
else {
cerr << "Integer types > 64 bits not supported: " << *Ty << "\n";
abort();
}
maskToBitWidth(Dest, BitWidth);
} else {
cerr << "Unhandled type for Shl instruction: " << *Ty << "\n";
abort();
@ -1228,6 +1229,7 @@ static GenericValue executeLShrInst(GenericValue Src1, GenericValue Src2,
cerr << "Integer types > 64 bits not supported: " << *Ty << "\n";
abort();
}
maskToBitWidth(Dest, BitWidth);
} else {
cerr << "Unhandled type for LShr instruction: " << *Ty << "\n";
abort();
@ -1252,6 +1254,7 @@ static GenericValue executeAShrInst(GenericValue Src1, GenericValue Src2,
cerr << "Integer types > 64 bits not supported: " << *Ty << "\n"; \
abort();
}
maskToBitWidth(Dest, BitWidth);
} else {
cerr << "Unhandled type for AShr instruction: " << *Ty << "\n";
abort();
@ -1567,6 +1570,7 @@ GenericValue Interpreter::executeBitCastInst(Value *SrcVal, const Type *DstTy,
Dest.Int32Val = Src.Int32Val;
else
Dest.Int64Val = Src.Int64Val;
maskToBitWidth(Dest, DBitWidth);
} else
assert(0 && "Invalid BitCast");
} else if (DstTy == Type::FloatTy) {
@ -1673,6 +1677,7 @@ void Interpreter::visitVAArgInst(VAArgInst &I) {
Dest.Int64Val = Src.Int64Val;
else
assert("Integer types > 64 bits not supported");
maskToBitWidth(Dest, BitWidth);
}
IMPLEMENT_VAARG(Pointer);
IMPLEMENT_VAARG(Float);