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GP-1954 Refactor characterizeAsParam, AncestorRealistic adjustments

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This commit is contained in:
caheckman 2022-04-25 16:37:41 -04:00
parent 91eb96f109
commit b7955f2a79
15 changed files with 711 additions and 191 deletions
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24
Ghidra/Features/Decompiler/src/decompile/cpp/varnode.cc
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@ -1632,6 +1632,30 @@ void VarnodeBank::verifyIntegrity(void) const
}
#endif
/// \brief Return \b true if the alternate path looks more valid than the main path.
///
/// Two different paths from a common Varnode each terminate at a CALL, CALLIND, or RETURN.
/// Evaluate which path most likely represents actual parameter/return value passing,
/// based on traversal information about each path.
/// \param vn is the Varnode terminating the \e alternate path
/// \param flags indicates traversals for both paths
/// \return \b true if the alternate path is preferred
bool TraverseNode::isAlternatePathValid(const Varnode *vn,uint4 flags)
{
if ((flags & (indirect | indirectalt)) == indirect)
// If main path traversed an INDIRECT but the alternate did not
return true; // Main path traversed INDIRECT, alternate did not
if ((flags & (indirect | indirectalt)) == indirectalt)
return false; // Alternate path traversed INDIRECT, main did not
if ((flags & actionalt) != 0)
return true; // Alternate path traversed a dedicated COPY
if (vn->loneDescend() == (PcodeOp*)0) return false;
const PcodeOp *op = vn->getDef();
if (op == (PcodeOp*)0) return true;
return !op->isMarker(); // MULTIEQUAL or INDIRECT indicates multiple values
}
/// Return true if \b vn1 contains the high part and \b vn2 the low part
/// of what was(is) a single value.
/// \param vn1 is the putative high Varnode