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GP-1518 Decompiler support for unions

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This commit is contained in:
caheckman 2021-11-19 14:39:42 -05:00
parent 53e2c4dc4f
commit 3fdbbbb231
65 changed files with 5119 additions and 1068 deletions
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42
Ghidra/Features/Decompiler/src/decompile/cpp/cast.cc
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@ -58,10 +58,10 @@ bool CastStrategyC::checkIntPromotionForExtension(const PcodeOp *op) const
return true; // Otherwise we need a cast before we extend
}
int4 CastStrategyC::localExtensionType(const Varnode *vn) const
int4 CastStrategyC::localExtensionType(const Varnode *vn,const PcodeOp *op) const
{
type_metatype meta = vn->getHigh()->getType()->getMetatype();
type_metatype meta = vn->getHighTypeReadFacing(op)->getMetatype();
int4 natural; // 1= natural zero extension, 2= natural sign extension
if ((meta == TYPE_UINT)||(meta == TYPE_BOOL)||(meta == TYPE_UNKNOWN))
natural = UNSIGNED_EXTENSION;
@ -78,14 +78,14 @@ int4 CastStrategyC::localExtensionType(const Varnode *vn) const
return natural;
if (!vn->isWritten())
return UNKNOWN_PROMOTION;
const PcodeOp *op = vn->getDef();
if (op->isBoolOutput())
const PcodeOp *defOp = vn->getDef();
if (defOp->isBoolOutput())
return EITHER_EXTENSION;
OpCode opc = op->code();
if ((opc == CPUI_CAST)||(opc == CPUI_LOAD)||op->isCall())
OpCode opc = defOp->code();
if ((opc == CPUI_CAST)||(opc == CPUI_LOAD)||defOp->isCall())
return natural;
if (opc == CPUI_INT_AND) { // This is kind of recursing
const Varnode *tmpvn = op->getIn(1);
const Varnode *tmpvn = defOp->getIn(1);
if (tmpvn->isConstant()) {
if (!signbit_negative(tmpvn->getOffset(),tmpvn->getSize()))
return EITHER_EXTENSION;
@ -102,7 +102,7 @@ int4 CastStrategyC::intPromotionType(const Varnode *vn) const
if (vn->getSize() >= promoteSize)
return NO_PROMOTION;
if (vn->isConstant())
return localExtensionType(vn);
return localExtensionType(vn,vn->loneDescend());
if (vn->isExplicit())
return NO_PROMOTION;
if (!vn->isWritten()) return UNKNOWN_PROMOTION;
@ -111,21 +111,21 @@ int4 CastStrategyC::intPromotionType(const Varnode *vn) const
switch(op->code()) {
case CPUI_INT_AND:
othervn = op->getIn(1);
if ((localExtensionType(othervn) & UNSIGNED_EXTENSION) != 0)
if ((localExtensionType(othervn,op) & UNSIGNED_EXTENSION) != 0)
return UNSIGNED_EXTENSION;
othervn = op->getIn(0);
if ((localExtensionType(othervn) & UNSIGNED_EXTENSION) != 0)
if ((localExtensionType(othervn,op) & UNSIGNED_EXTENSION) != 0)
return UNSIGNED_EXTENSION; // If either side has zero extension, result has zero extension
break;
case CPUI_INT_RIGHT:
othervn = op->getIn(0);
val = localExtensionType(othervn);
val = localExtensionType(othervn,op);
if ((val & UNSIGNED_EXTENSION) != 0) // If the input provably zero extends
return val; // then the result is a zero extension (plus possibly a sign extension)
break;
case CPUI_INT_SRIGHT:
othervn = op->getIn(0);
val = localExtensionType(othervn);
val = localExtensionType(othervn,op);
if ((val & SIGNED_EXTENSION) != 0) // If input can be construed as a sign-extension
return val; // then the result is a sign extension (plus possibly a zero extension)
break;
@ -134,25 +134,25 @@ int4 CastStrategyC::intPromotionType(const Varnode *vn) const
case CPUI_INT_DIV:
case CPUI_INT_REM:
othervn = op->getIn(0);
if ((localExtensionType(othervn) & UNSIGNED_EXTENSION) == 0)
if ((localExtensionType(othervn,op) & UNSIGNED_EXTENSION) == 0)
return UNKNOWN_PROMOTION;
othervn = op->getIn(1);
if ((localExtensionType(othervn) & UNSIGNED_EXTENSION) == 0)
if ((localExtensionType(othervn,op) & UNSIGNED_EXTENSION) == 0)
return UNKNOWN_PROMOTION;
return UNSIGNED_EXTENSION; // If both sides have zero extension, result has zero extension
case CPUI_INT_SDIV:
case CPUI_INT_SREM:
othervn = op->getIn(0);
if ((localExtensionType(othervn) & SIGNED_EXTENSION) == 0)
if ((localExtensionType(othervn,op) & SIGNED_EXTENSION) == 0)
return UNKNOWN_PROMOTION;
othervn = op->getIn(1);
if ((localExtensionType(othervn) & SIGNED_EXTENSION) == 0)
if ((localExtensionType(othervn,op) & SIGNED_EXTENSION) == 0)
return UNKNOWN_PROMOTION;
return SIGNED_EXTENSION; // If both sides have sign extension, result has sign extension
case CPUI_INT_NEGATE:
case CPUI_INT_2COMP:
othervn = op->getIn(0);
if ((localExtensionType(othervn) & SIGNED_EXTENSION) != 0)
if ((localExtensionType(othervn,op) & SIGNED_EXTENSION) != 0)
return SIGNED_EXTENSION;
break;
case CPUI_INT_ADD:
@ -176,7 +176,7 @@ bool CastStrategyC::isExtensionCastImplied(const PcodeOp *op,const PcodeOp *read
else {
if (readOp == (PcodeOp *) 0)
return false;
type_metatype metatype = outVn->getHigh()->getType()->getMetatype();
type_metatype metatype = outVn->getHighTypeReadFacing(readOp)->getMetatype();
const Varnode *otherVn;
int4 slot;
switch (readOp->code()) {
@ -206,7 +206,7 @@ bool CastStrategyC::isExtensionCastImplied(const PcodeOp *op,const PcodeOp *read
}
else if (!otherVn->isExplicit())
return false;
if (otherVn->getHigh()->getType()->getMetatype() != metatype)
if (otherVn->getHighTypeReadFacing(readOp)->getMetatype() != metatype)
return false;
break;
default:
@ -298,13 +298,13 @@ Datatype *CastStrategyC::castStandard(Datatype *reqtype,Datatype *curtype,
Datatype *CastStrategyC::arithmeticOutputStandard(const PcodeOp *op)
{
Datatype *res1 = op->getIn(0)->getHigh()->getType();
Datatype *res1 = op->getIn(0)->getHighTypeReadFacing(op);
if (res1->getMetatype() == TYPE_BOOL) // Treat boolean as if it is cast to an integer
res1 = tlst->getBase(res1->getSize(),TYPE_INT);
Datatype *res2;
for(int4 i=1;i<op->numInput();++i) {
res2 = op->getIn(i)->getHigh()->getType();
res2 = op->getIn(i)->getHighTypeReadFacing(op);
if (res2->getMetatype() == TYPE_BOOL) continue;
if (0>res2->typeOrder(*res1))
res1 = res2;