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Merge remote-tracking branch 'origin/GP-5718_LeftShiftSubvar' into patch

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This commit is contained in:
Ryan Kurtz 2025-07-14 16:09:18 -04:00
commit 9ddc746e6f
1 changed files with 9 additions and 4 deletions
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13
Ghidra/Features/Decompiler/src/decompile/cpp/subflow.cc
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@ -731,10 +731,15 @@ bool SubvariableFlow::traceBackward(ReplaceVarnode *rvn)
addNewConstant(rop,0,(uintb)0);
return true;
}
if ((newmask<<sa) != rvn->mask)
break; // subvariable is truncated by shift
rop = createOp(CPUI_COPY,1,rvn);
if (!createLink(rop,newmask,0,op->getIn(0))) return false;
if ((newmask<<sa) == rvn->mask) {
rop = createOp(CPUI_COPY,1,rvn);
if (!createLink(rop,newmask,0,op->getIn(0))) return false;
return true;
}
if ((rvn->mask & 1)==0) return false; // Can't assume zeroes are shifted into least sig bits
rop = createOp(CPUI_INT_LEFT,2,rvn);
if (!createLink(rop,rvn->mask,0,op->getIn(0))) return false;
addConstant(rop,calc_mask(op->getIn(1)->getSize()),1,op->getIn(1)); // Preserve the shift amount
return true;
case CPUI_INT_RIGHT:
if (!op->getIn(1)->isConstant()) break; // Dynamic shift