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Refactor extractBytes function to handle various input sizes correctly #32

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Merged
merged 1 commit into from
Aug 14, 2024
Merged

Refactor extractBytes function to handle various input sizes correctly #32

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35 changes: 13 additions & 22 deletions lifter/GEPTracker.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -234,35 +234,26 @@ class lifterMemoryBuffer {
}

private:
Value* extractBytes(IRBuilder<>& builder, Value* value, uint64_t startOffset,
uint64_t endOffset) {
Value* extractBytes(IRBuilder<>& builder, Value* value, uint64_t startOffset, uint64_t endOffset) {
LLVMContext& context = builder.getContext();

if (!value) {
return ConstantInt::get(
Type::getIntNTy(context, (endOffset - startOffset) * 8), 0);
}

uint64_t byteCount = endOffset - startOffset;
Type* resultType = Type::getIntNTy(context, byteCount * 8);

uint64_t shiftAmount = startOffset * 8;

printvalue2(endOffset);
printvalue(value);

printvalue2(startOffset);
printvalue2(byteCount);
printvalue2(shiftAmount);
// Shift right if needed
if (startOffset > 0) {
uint64_t shiftAmount = startOffset * 8;
value = createLShrFolder(builder, value, APInt(value->getType()->getIntegerBitWidth(), shiftAmount), "shiftedValue");
}

Value* shiftedValue = createLShrFolder(
builder, value,
APInt(value->getType()->getIntegerBitWidth(), shiftAmount),
"extractbytes");
printvalue(value);
printvalue(shiftedValue);

Value* truncatedValue = createTruncFolder(
builder, shiftedValue, Type::getIntNTy(context, byteCount * 8));
return truncatedValue;
// Extend or truncate to the required size
value = createZExtOrTruncFolder(builder, value, resultType);

printvalue(value);
return value;
}
};

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