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GP-2291 Support for unions through partial containers

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caheckman 2022-08-24 11:46:46 -04:00
parent d3efd60d54
commit cb9c12894e
21 changed files with 678 additions and 182 deletions
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27
Ghidra/Features/Decompiler/src/decompile/cpp/database.cc
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@ -1525,6 +1525,8 @@ SymbolEntry *Scope::addSymbol(const string &nm,Datatype *ct,
{
Symbol *sym;
if (ct->hasStripped())
ct = ct->getStripped();
sym = new Symbol(owner,nm,ct);
addSymbolInternal(sym);
return addMapPoint(sym,addr,usepoint);
@ -1713,6 +1715,29 @@ Symbol *Scope::addEquateSymbol(const string &nm,uint4 format,uintb value,const A
return sym;
}
/// \brief Create a symbol forcing a field interpretation for a specific access to a variable with \e union data-type
///
/// The symbol is attached to a specific Varnode and a PcodeOp that reads or writes to it. The Varnode,
/// in the context of the PcodeOp, is forced to have the data-type of the selected field, and field's name is used
/// to represent the Varnode in output.
/// \param nm is the name of the symbol
/// \param dt is the union data-type containing the field to force
/// \param fieldNum is the index of the desired field, or -1 if the whole union should be forced
/// \param addr is the address of the p-code op reading/writing the Varnode
/// \param hash is the dynamic hash identifying the Varnode
/// \return the new UnionFacetSymbol
Symbol *Scope::addUnionFacetSymbol(const string &nm,Datatype *dt,int4 fieldNum,const Address &addr,uint8 hash)
{
Symbol *sym = new UnionFacetSymbol(owner,nm,dt,fieldNum);
addSymbolInternal(sym);
RangeList rnglist;
if (!addr.isInvalid())
rnglist.insertRange(addr.getSpace(),addr.getOffset(),addr.getOffset());
addDynamicMapInternal(sym,Varnode::mapped,hash,0,1,rnglist);
return sym;
}
/// Create default name given information in the Symbol and possibly a representative Varnode.
/// This method extracts the crucial properties and then uses the buildVariableName method to
/// construct the actual name.
@ -2129,6 +2154,8 @@ void ScopeInternal::renameSymbol(Symbol *sym,const string &newname)
void ScopeInternal::retypeSymbol(Symbol *sym,Datatype *ct)
{
if (ct->hasStripped())
ct = ct->getStripped();
if ((sym->type->getSize() == ct->getSize())||(sym->mapentry.empty())) {
// If size is the same, or no mappings nothing special to do
sym->type = ct;