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GP-1518 Decompiler support for unions

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This commit is contained in:
caheckman 2021-11-19 14:39:42 -05:00
parent 53e2c4dc4f
commit 3fdbbbb231
65 changed files with 5119 additions and 1068 deletions
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52
Ghidra/Features/Decompiler/src/decompile/cpp/varnode.cc
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@ -564,6 +564,58 @@ Varnode::~Varnode(void)
}
}
/// This generally just returns the data-type of the Varnode itself unless it is a \e union data-type.
/// In this case, the data-type of the resolved field of the \e union, associated with writing to the Varnode,
/// is returned. The Varnode \b must be written to, to call this method.
/// \return the resolved data-type
Datatype *Varnode::getTypeDefFacing(void) const
{
if (!type->needsResolution())
return type;
return type->findResolve(def,-1);
}
/// This generally just returns the data-type of the Varnode itself unless it is a \e union data-type.
/// In this case, the data-type of the resolved field of the \e union, associated with reading the Varnode,
/// is returned.
/// \param op is the PcodeOp reading \b this Varnode
/// \return the resolved data-type
Datatype *Varnode::getTypeReadFacing(const PcodeOp *op) const
{
if (!type->needsResolution())
return type;
return type->findResolve(op, op->getSlot(this));
}
/// This generally just returns the data-type of the HighVariable associated with \b this, unless it is a
/// \e union data-type. In this case, the data-type of the resolved field of the \e union, associated with
/// writing to the Varnode, is returned.
/// \return the resolved data-type
Datatype *Varnode::getHighTypeDefFacing(void) const
{
Datatype *ct = high->getType();
if (!ct->needsResolution())
return ct;
return ct->findResolve(def,-1);
}
/// This generally just returns the data-type of the HighVariable associated with \b this, unless it is a
/// \e union data-type. In this case, the data-type of the resolved field of the \e union, associated with
/// reading the Varnode, is returned.
/// \param op is the PcodeOp reading \b this Varnode
/// \return the resolved data-type
Datatype *Varnode::getHighTypeReadFacing(const PcodeOp *op) const
{
Datatype *ct = high->getType();
if (!ct->needsResolution())
return ct;
return ct->findResolve(op, op->getSlot(this));
}
/// This is a convenience method for quickly finding the unique PcodeOp that reads this Varnode
/// \return only descendant (if there is 1 and ONLY 1) or \b null otherwise
PcodeOp *Varnode::loneDescend(void) const