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Code Issues Releases Wiki Activity

GP-5989 Fix ForceUnionAction "Could not recover p-code op"

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This commit is contained in:
caheckman 2025-09-24 19:05:30 +00:00
parent 8802befa22
commit 72344ce13e
1 changed files with 36 additions and 32 deletions
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64
Ghidra/Features/Decompiler/src/main/java/ghidra/app/plugin/core/decompile/actions/ForceUnionAction.java
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@ -128,28 +128,28 @@ public class ForceUnionAction extends AbstractDecompilerAction {
int opcode = accessOp.getOpcode();
if (opcode == PcodeOp.PTRSUB) {
parentDt = typeIsUnionRelated(accessOp.getInput(0));
if (parentDt == null) {
accessOp = null;
return;
}
accessVn = accessOp.getInput(0);
accessSlot = 0;
if (accessOp.getInput(1).getOffset() == 0) { // Artificial op
do {
Varnode tmpVn = accessOp.getOutput();
PcodeOp tmpOp = tmpVn.getLoneDescend();
if (tmpOp == null) {
break;
if (parentDt != null) {
accessVn = accessOp.getInput(0);
accessSlot = 0;
if (accessOp.getInput(1).getOffset() == 0) { // Artificial op
do {
Varnode tmpVn = accessOp.getOutput();
PcodeOp tmpOp = tmpVn.getLoneDescend();
if (tmpOp == null) {
break;
}
accessOp = tmpOp;
accessVn = tmpVn;
accessSlot = accessOp.getSlot(accessVn);
}
accessOp = tmpOp;
accessVn = tmpVn;
accessSlot = accessOp.getSlot(accessVn);
while (accessOp.getOpcode() == PcodeOp.PTRSUB &&
accessOp.getInput(1).getOffset() == 0);
}
while (accessOp.getOpcode() == PcodeOp.PTRSUB &&
accessOp.getInput(1).getOffset() == 0);
return;
}
}
else {
parentDt = null;
for (accessSlot = 0; accessSlot < accessOp.getNumInputs(); ++accessSlot) {
accessVn = accessOp.getInput(accessSlot);
parentDt = typeIsUnionRelated(accessVn);
@ -157,22 +157,26 @@ public class ForceUnionAction extends AbstractDecompilerAction {
break;
}
}
if (accessSlot >= accessOp.getNumInputs()) {
accessSlot = -1;
accessVn = accessOp.getOutput();
parentDt = typeIsUnionRelated(accessVn);
if (parentDt == null) {
accessOp = null;
return; // Give up, could not find type associated with field
if (parentDt != null) {
if (opcode == PcodeOp.SUBPIECE && accessSlot == 0 &&
!(parentDt instanceof Pointer)) {
// SUBPIECE acts directly as resolution operator
// Choose field based on output varnode, even though it isn't the union data-type
accessSlot = -1;
accessVn = accessOp.getOutput();
}
}
if (opcode == PcodeOp.SUBPIECE && accessSlot == 0 && !(parentDt instanceof Pointer)) {
// SUBPIECE acts directly as resolution operator
// Choose field based on output varnode, even though it isn't the union data-type
accessSlot = -1;
accessVn = accessOp.getOutput();
return;
}
}
accessSlot = -1;
accessVn = accessOp.getOutput();
if (accessVn != null) {
parentDt = typeIsUnionRelated(accessVn);
if (parentDt != null) {
return;
}
}
accessOp = null; // Give up, could not find type associated with field
}
/**