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Fix for 1-field structure bug

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This commit is contained in:
caheckman 2019-04-09 10:41:52 -04:00
parent 1dcba64533
commit 20a59296d9
1 changed files with 16 additions and 8 deletions
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24
Ghidra/Features/Decompiler/src/decompile/cpp/ruleaction.cc
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@ -5659,19 +5659,27 @@ int4 RuleStructOffset0::applyOp(PcodeOp *op,Funcdata &data)
ct = op->getIn(1)->getType();
if (ct->getMetatype() != TYPE_PTR) return 0;
ct = ((TypePointer *)ct)->getPtrTo();
if (ct->getSize()<=movesize) {
// if ((ct->getSize() < movesize)||(ct->getMetatype() != TYPE_STRUCT))
return 0;
// If we reach here (ct->getSize() == movesize) && (ct->getMetatype() == TYPE_STRUCT)
// So the LOAD/STORE encompasses the entire structure. By not returning here, if the first
// field of the struct is the whole struct, we display the field reference
}
if (ct->getMetatype() == TYPE_STRUCT) {
if (ct->getSize() < movesize)
return 0; // Moving something bigger than entire structure
sub_ct = ct->getSubType(0,&offset); // Get field at offset 0
if (sub_ct==(Datatype *)0) return 0;
if (sub_ct->getSize() < movesize) return 0; // Subtype is too small to handle LOAD/STORE
// if (ct->getSize() == movesize) {
// If we reach here, move is same size as the structure, which is the same size as
// the first element.
// }
}
else if (ct->getMetatype() != TYPE_ARRAY)
else if (ct->getMetatype() == TYPE_ARRAY) {
if (ct->getSize() < movesize)
return 0; // Moving something bigger than entire array
if (ct->getSize() == movesize) { // Moving something the size of entire array
if (((TypeArray *)ct)->numElements() != 1)
return 0;
// If we reach here, moving something size of single element. Assume this is normal access.
}
}
else
return 0;
newop = data.newOpBefore(op,CPUI_PTRSUB,op->getIn(1),data.newConstant(op->getIn(1)->getSize(),0));