#include "llvm/InlineAsm.h"
#include "ConstantsContext.h"
#include "LLVMContextImpl.h"
#include "llvm/DerivedTypes.h"
#include <algorithm>
#include <cctype>
using namespace llvm;
InlineAsm::~InlineAsm() {
}
InlineAsm *InlineAsm::get(FunctionType *Ty, StringRef AsmString,
StringRef Constraints, bool hasSideEffects,
bool isAlignStack) {
InlineAsmKeyType Key(AsmString, Constraints, hasSideEffects, isAlignStack);
LLVMContextImpl *pImpl = Ty->getContext().pImpl;
return pImpl->InlineAsms.getOrCreate(PointerType::getUnqual(Ty), Key);
}
InlineAsm::InlineAsm(PointerType *Ty, const std::string &asmString,
const std::string &constraints, bool hasSideEffects,
bool isAlignStack)
: Value(Ty, Value::InlineAsmVal),
AsmString(asmString),
Constraints(constraints), HasSideEffects(hasSideEffects),
IsAlignStack(isAlignStack) {
assert(Verify(getFunctionType(), constraints) &&
"Function type not legal for constraints!");
}
void InlineAsm::destroyConstant() {
getType()->getContext().pImpl->InlineAsms.remove(this);
delete this;
}
FunctionType *InlineAsm::getFunctionType() const {
return cast<FunctionType>(getType()->getElementType());
}
InlineAsm::ConstraintInfo::ConstraintInfo() :
Type(isInput), isEarlyClobber(false),
MatchingInput(-1), isCommutative(false),
isIndirect(false), isMultipleAlternative(false),
currentAlternativeIndex(0) {
}
InlineAsm::ConstraintInfo::ConstraintInfo(const ConstraintInfo &other) :
Type(other.Type), isEarlyClobber(other.isEarlyClobber),
MatchingInput(other.MatchingInput), isCommutative(other.isCommutative),
isIndirect(other.isIndirect), Codes(other.Codes),
isMultipleAlternative(other.isMultipleAlternative),
multipleAlternatives(other.multipleAlternatives),
currentAlternativeIndex(other.currentAlternativeIndex) {
}
bool InlineAsm::ConstraintInfo::Parse(StringRef Str,
InlineAsm::ConstraintInfoVector &ConstraintsSoFar) {
StringRef::iterator I = Str.begin(), E = Str.end();
unsigned multipleAlternativeCount = Str.count('|') + 1;
unsigned multipleAlternativeIndex = 0;
ConstraintCodeVector *pCodes = &Codes;
isMultipleAlternative = (multipleAlternativeCount > 1 ? true : false);
if (isMultipleAlternative) {
multipleAlternatives.resize(multipleAlternativeCount);
pCodes = &multipleAlternatives[0].Codes;
}
Type = isInput;
isEarlyClobber = false;
MatchingInput = -1;
isCommutative = false;
isIndirect = false;
currentAlternativeIndex = 0;
if (*I == '~') {
Type = isClobber;
++I;
} else if (*I == '=') {
++I;
Type = isOutput;
}
if (*I == '*') {
isIndirect = true;
++I;
}
if (I == E) return true;
bool DoneWithModifiers = false;
while (!DoneWithModifiers) {
switch (*I) {
default:
DoneWithModifiers = true;
break;
case '&': if (Type != isOutput || isEarlyClobber) return true;
isEarlyClobber = true;
break;
case '%': if (Type == isClobber || isCommutative) return true;
isCommutative = true;
break;
case '#': case '*': return true; }
if (!DoneWithModifiers) {
++I;
if (I == E) return true; }
}
while (I != E) {
if (*I == '{') { StringRef::iterator ConstraintEnd = std::find(I+1, E, '}');
if (ConstraintEnd == E) return true; pCodes->push_back(std::string(I, ConstraintEnd+1));
I = ConstraintEnd+1;
} else if (isdigit(*I)) { StringRef::iterator NumStart = I;
while (I != E && isdigit(*I))
++I;
pCodes->push_back(std::string(NumStart, I));
unsigned N = atoi(pCodes->back().c_str());
if (N >= ConstraintsSoFar.size() || ConstraintsSoFar[N].Type != isOutput||
Type != isInput)
return true;
if (isMultipleAlternative) {
InlineAsm::SubConstraintInfo &scInfo =
ConstraintsSoFar[N].multipleAlternatives[multipleAlternativeIndex];
if (scInfo.MatchingInput != -1)
return true;
scInfo.MatchingInput = ConstraintsSoFar.size();
} else {
if (ConstraintsSoFar[N].hasMatchingInput())
return true;
ConstraintsSoFar[N].MatchingInput = ConstraintsSoFar.size();
}
} else if (*I == '|') {
multipleAlternativeIndex++;
pCodes = &multipleAlternatives[multipleAlternativeIndex].Codes;
++I;
} else if (*I == '^') {
pCodes->push_back(std::string(I+1, I+3));
I += 3;
} else {
pCodes->push_back(std::string(I, I+1));
++I;
}
}
return false;
}
void InlineAsm::ConstraintInfo::selectAlternative(unsigned index) {
if (index < multipleAlternatives.size()) {
currentAlternativeIndex = index;
InlineAsm::SubConstraintInfo &scInfo =
multipleAlternatives[currentAlternativeIndex];
MatchingInput = scInfo.MatchingInput;
Codes = scInfo.Codes;
}
}
InlineAsm::ConstraintInfoVector
InlineAsm::ParseConstraints(StringRef Constraints) {
ConstraintInfoVector Result;
for (StringRef::iterator I = Constraints.begin(),
E = Constraints.end(); I != E; ) {
ConstraintInfo Info;
StringRef::iterator ConstraintEnd = std::find(I, E, ',');
if (ConstraintEnd == I || Info.Parse(StringRef(I, ConstraintEnd-I), Result)) {
Result.clear(); break;
}
Result.push_back(Info);
I = ConstraintEnd;
if (I != E) {
++I;
if (I == E) { Result.clear(); break; } }
}
return Result;
}
bool InlineAsm::Verify(FunctionType *Ty, StringRef ConstStr) {
if (Ty->isVarArg()) return false;
ConstraintInfoVector Constraints = ParseConstraints(ConstStr);
if (Constraints.empty() && !ConstStr.empty()) return false;
unsigned NumOutputs = 0, NumInputs = 0, NumClobbers = 0;
unsigned NumIndirect = 0;
for (unsigned i = 0, e = Constraints.size(); i != e; ++i) {
switch (Constraints[i].Type) {
case InlineAsm::isOutput:
if ((NumInputs-NumIndirect) != 0 || NumClobbers != 0)
return false; if (!Constraints[i].isIndirect) {
++NumOutputs;
break;
}
++NumIndirect;
case InlineAsm::isInput:
if (NumClobbers) return false; ++NumInputs;
break;
case InlineAsm::isClobber:
++NumClobbers;
break;
}
}
switch (NumOutputs) {
case 0:
if (!Ty->getReturnType()->isVoidTy()) return false;
break;
case 1:
if (Ty->getReturnType()->isStructTy()) return false;
break;
default:
StructType *STy = dyn_cast<StructType>(Ty->getReturnType());
if (STy == 0 || STy->getNumElements() != NumOutputs)
return false;
break;
}
if (Ty->getNumParams() != NumInputs) return false;
return true;
}