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GP-5240 Simplify late expressions where a SUBPIECE is taken of a PIECE

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caheckman 2025-01-06 21:51:28 +00:00
parent acf5ac688a
commit 53d8d182e3
15 changed files with 215 additions and 88 deletions
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18
Ghidra/Features/Decompiler/src/decompile/cpp/subflow.hh
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@ -353,6 +353,24 @@ public:
virtual int4 applyOp(PcodeOp *op,Funcdata &data);
};
/// \brief Simplify join and break apart based on data-types
///
/// Simplify expressions like:
/// - `sub( concat(V,W), 0) => W`
/// - `sub( concat(V,W), c) => V`
///
/// preserving the data-types and removing the SUBPIECE and PIECE operations that are discarded.
class RuleDumptyHumpLate : public Rule {
public:
RuleDumptyHumpLate(const string &g) : Rule( g, 0, "dumptyhumplate") {} ///< Constructor
virtual Rule *clone(const ActionGroupList &grouplist) const {
if (!grouplist.contains(getGroup())) return (Rule *)0;
return new RuleDumptyHumpLate(getGroup());
}
virtual void getOpList(vector<uint4> &oplist) const;
virtual int4 applyOp(PcodeOp *op,Funcdata &data);
};
/// \brief Class for tracing changes of precision in floating point variables
///
/// It follows the flow of a logical lower precision value stored in higher precision locations