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Iterate statement form

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This commit is contained in:
caheckman 2021-01-05 10:12:14 -05:00
parent b2bc1eb019
commit 3644c120c0
1 changed files with 25 additions and 13 deletions
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38
Ghidra/Features/Decompiler/src/decompile/cpp/block.cc
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@ -3058,23 +3058,35 @@ PcodeOp *BlockWhileDo::testTerminal(Funcdata &data,int4 slot) const
return resOp; return resOp;
} }
/// This is a final sanity check on the \e iterate statement. If statement is just a /// Make sure the loop variable is involved as input in the iterator statement.
/// CAST or COPY, we revert to displaying the whole loop using \e while /// \return \b true if the loop variable is an input to the iterator statement
/// \return \b true is the statement looks like a suitable for-loop iterator.
bool BlockWhileDo::testIterateForm(void) const bool BlockWhileDo::testIterateForm(void) const
{ {
PcodeOp *curOp = iterateOp; Varnode *targetVn = loopDef->getOut();
OpCode opc = curOp->code(); HighVariable *high = targetVn->getHigh();
while(opc == CPUI_COPY || opc == CPUI_CAST) {
Varnode *vn = curOp->getIn(0); vector<PcodeOpNode> path;
if (!curOp->notPrinted()) PcodeOp *op = iterateOp;
if (vn->isExplicit()) return false; // End of statement, no substantive op seen path.push_back(PcodeOpNode(op,0));
if (!vn->isWritten()) return false; while(!path.empty()) {
curOp = vn->getDef(); PcodeOpNode &node(path.back());
opc = curOp->code(); if (node.op->numInput() <= node.slot) {
path.pop_back();
continue;
}
Varnode *vn = node.op->getIn(node.slot);
node.slot += 1;
if (vn->isAnnotation()) continue;
if (vn->getHigh() == high) {
return true;
}
if (vn->isExplicit()) continue; // Truncate at explicit
if (!vn->isWritten()) continue;
op = vn->getDef();
path.push_back(PcodeOpNode(vn->getDef(),0));
} }
return true; return false;
} }
void BlockWhileDo::markLabelBumpUp(bool bump) void BlockWhileDo::markLabelBumpUp(bool bump)