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GP-1405 Create data-type recommendation for potential this parameter

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caheckman 2022-06-17 14:51:35 -04:00
parent 91e5259018
commit 4f6211859b
7 changed files with 64 additions and 1 deletions
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24
Ghidra/Features/Decompiler/src/decompile/cpp/funcdata_varnode.cc
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@ -1549,6 +1549,30 @@ void Funcdata::mapGlobals(void)
warningHeader("Globals starting with '_' overlap smaller symbols at the same address");
}
/// Make sure that if a Varnode exists representing the "this" pointer for the function, that it
/// is treated as pointer data-type.
void Funcdata::prepareThisPointer(void)
{
int4 numInputs = funcp.numParams();
for(int4 i=0;i<numInputs;++i) {
ProtoParameter *param = funcp.getParam(i);
if (param->isThisPointer() && param->isTypeLocked())
return; // Data-type will be obtained directly from symbol
}
// Its possible that a recommendation for the "this" pointer has already been been collected.
// Currently the only type recommendations are for the "this" pointer. If there any, it is for "this"
if (localmap->hasTypeRecommendations())
return;
Datatype *dt = glb->types->getTypeVoid();
AddrSpace *spc = glb->getDefaultDataSpace();
dt = glb->types->getTypePointer(spc->getAddrSize(),dt,spc->getWordSize());
Address addr = funcp.getThisPointerStorage(dt);
localmap->addTypeRecommendation(addr, dt);
}
/// \brief Test for legitimate double use of a parameter trial
///
/// The given trial is a \e putative input to first CALL, but can also trace its data-flow