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Code Issues Releases Wiki Activity

Refactor ParamEntry look-up allowing "contained by" discovery

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This commit is contained in:
caheckman 2019-07-08 13:54:03 -04:00
parent ef12c20829
commit 12d3da029b
13 changed files with 690 additions and 286 deletions
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26
Ghidra/Features/Decompiler/src/decompile/cpp/funcdata_varnode.cc
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@ -924,7 +924,7 @@ bool Funcdata::updateFlags(VarnodeLocSet::const_iterator &iter,uint4 flags,Datat
/// The Symbol is really attached to the Varnode's HighVariable (which must exist).
/// The only reason a Symbol doesn't get set is if, the HighVariable
/// is global and there is no pre-existing Symbol. (see mapGlobals())
/// \param is the given Varnode
/// \param vn is the given Varnode
/// \return the associated Symbol or NULL
Symbol *Funcdata::linkSymbol(Varnode *vn)
@ -1440,11 +1440,29 @@ int4 AncestorRealistic::enterNode(State &state)
stateStack.push_back(State(op,0));
return enter_node; // Enter the new node
case CPUI_SUBPIECE:
// Extracting to a temporary, or to the same storage location, or otherwise incidental
// are viewed as just another node on the path to traverse
if (op->getOut()->getSpace()->getType()==IPTR_INTERNAL||op->getIn(0)->isIncidentalCopy()
|| (op->getOut()->overlap(*op->getIn(0)) == (int4)op->getIn(1)->getOffset())) {
stateStack.push_back(State(op,0));
return enter_node; // Push into the new node
}
// For other SUBPIECES, do a minimal traversal to rule out unaffected or other invalid inputs,
// but otherwise treat it as valid, active, movement into the parameter
do {
Varnode *vn = op->getIn(0);
if ((!vn->isMark())&&(vn->isInput())) {
if (vn->isUnaffected()||(!vn->isDirectWrite()))
return pop_fail;
}
op = vn->getDef();
} while((op!=(PcodeOp *)0)&&((op->code() == CPUI_COPY)||(op->code()==CPUI_SUBPIECE)));
return pop_solid; // treat the COPY as a solid movement
case CPUI_COPY:
// Copies to a temporary, or between varnodes with same storage location, or otherwise incidental
// are viewed as just another node on the path to traverse
if ((op->getOut()->getSpace()->getType()==IPTR_INTERNAL)
||(op->getOut()->getAddr() == op->getIn(0)->getAddr())||(op->getIn(0)->isIncidentalCopy())) {
if (op->getOut()->getSpace()->getType()==IPTR_INTERNAL||op->getIn(0)->isIncidentalCopy()
|| (op->getOut()->getAddr() == op->getIn(0)->getAddr())) {
stateStack.push_back(State(op,0));
return enter_node; // Push into the new node
}
@ -1523,7 +1541,7 @@ int4 AncestorRealistic::uponPop(State &state,int4 pop_command)
/// \param op is the CALL or RETURN to test parameter passing for
/// \param slot is the index of the particular input varnode to test
/// \param t is the ParamTrial object corresponding to the varnode
/// \param allowFailingPath is true if we allow and test for failing paths due to conditional execution
/// \param allowFail is \b true if we allow and test for failing paths due to conditional execution
/// \return \b true if the varnode has realistic ancestors for a parameter passing location
bool AncestorRealistic::execute(PcodeOp *op,int4 slot,ParamTrial *t,bool allowFail)