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Add constants to analysis of hiding extension casts

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This commit is contained in:
caheckman 2020-02-20 14:42:40 -05:00
parent 36aebc2d9b
commit f28c377e9b
4 changed files with 64 additions and 58 deletions
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51
Ghidra/Features/Decompiler/src/decompile/cpp/cast.cc
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@ -166,6 +166,57 @@ int4 CastStrategyC::intPromotionType(const Varnode *vn) const
return UNKNOWN_PROMOTION;
}
bool CastStrategyC::isExtensionCastImplied(const PcodeOp *op,const PcodeOp *readOp) const
{
const Varnode *outVn = op->getOut();
if (outVn->isExplicit()) {
}
else {
if (readOp == (PcodeOp *) 0)
return false;
type_metatype metatype = outVn->getHigh()->getType()->getMetatype();
const Varnode *otherVn;
int4 slot;
switch (readOp->code()) {
case CPUI_PTRADD:
break;
case CPUI_INT_ADD:
case CPUI_INT_SUB:
case CPUI_INT_MULT:
case CPUI_INT_DIV:
case CPUI_INT_AND:
case CPUI_INT_OR:
case CPUI_INT_XOR:
case CPUI_INT_EQUAL:
case CPUI_INT_NOTEQUAL:
case CPUI_INT_LESS:
case CPUI_INT_LESSEQUAL:
case CPUI_INT_SLESS:
case CPUI_INT_SLESSEQUAL:
slot = readOp->getSlot(outVn);
otherVn = readOp->getIn(1 - slot);
// Check if the expression involves an explicit variable of the right integer type
if (otherVn->isConstant()) {
// Integer tokens do not naturally indicate their size, and
// integers that are bigger than the promotion size are NOT naturally extended.
if (otherVn->getSize() > promoteSize) // So if the integer is bigger than the promotion size
return false; // The extension cast on the other side must be explicit
}
else if (!otherVn->isExplicit())
return false;
if (otherVn->getHigh()->getType()->getMetatype() != metatype)
return false;
break;
default:
return false;
}
return true; // Everything is integer promotion
}
return false;
}
Datatype *CastStrategyC::castStandard(Datatype *reqtype,Datatype *curtype,
bool care_uint_int,bool care_ptr_uint) const