mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-16 11:30:51 +00:00
cbbae7f41d
follows '~' in a clobber constraint string. Previously llc would hit an llvm_unreachable when compiling an inline-asm instruction with malformed constraint string "~x{21}". This commit enables LLParser to catch the error earlier and print a more helpful diagnostic. rdar://problem/14206559 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217288 91177308-0d34-0410-b5e6-96231b3b80d8
290 lines
9.1 KiB
C++
290 lines
9.1 KiB
C++
//===-- InlineAsm.cpp - Implement the InlineAsm class ---------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the InlineAsm class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/IR/InlineAsm.h"
|
|
#include "ConstantsContext.h"
|
|
#include "LLVMContextImpl.h"
|
|
#include "llvm/IR/DerivedTypes.h"
|
|
#include <algorithm>
|
|
#include <cctype>
|
|
using namespace llvm;
|
|
|
|
// Implement the first virtual method in this class in this file so the
|
|
// InlineAsm vtable is emitted here.
|
|
InlineAsm::~InlineAsm() {
|
|
}
|
|
|
|
|
|
InlineAsm *InlineAsm::get(FunctionType *Ty, StringRef AsmString,
|
|
StringRef Constraints, bool hasSideEffects,
|
|
bool isAlignStack, AsmDialect asmDialect) {
|
|
InlineAsmKeyType Key(AsmString, Constraints, hasSideEffects, isAlignStack,
|
|
asmDialect);
|
|
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, AsmDialect asmDialect)
|
|
: Value(Ty, Value::InlineAsmVal),
|
|
AsmString(asmString), Constraints(constraints),
|
|
HasSideEffects(hasSideEffects), IsAlignStack(isAlignStack),
|
|
Dialect(asmDialect) {
|
|
|
|
// Do various checks on the constraint string and type.
|
|
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());
|
|
}
|
|
|
|
///Default constructor.
|
|
InlineAsm::ConstraintInfo::ConstraintInfo() :
|
|
Type(isInput), isEarlyClobber(false),
|
|
MatchingInput(-1), isCommutative(false),
|
|
isIndirect(false), isMultipleAlternative(false),
|
|
currentAlternativeIndex(0) {
|
|
}
|
|
|
|
/// Parse - Analyze the specified string (e.g. "==&{eax}") and fill in the
|
|
/// fields in this structure. If the constraint string is not understood,
|
|
/// return true, otherwise return false.
|
|
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;
|
|
|
|
// Initialize
|
|
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;
|
|
|
|
// Parse prefixes.
|
|
if (*I == '~') {
|
|
Type = isClobber;
|
|
++I;
|
|
|
|
// '{' must immediately follow '~'.
|
|
if (I != E && *I != '{')
|
|
return true;
|
|
} else if (*I == '=') {
|
|
++I;
|
|
Type = isOutput;
|
|
}
|
|
|
|
if (*I == '*') {
|
|
isIndirect = true;
|
|
++I;
|
|
}
|
|
|
|
if (I == E) return true; // Just a prefix, like "==" or "~".
|
|
|
|
// Parse the modifiers.
|
|
bool DoneWithModifiers = false;
|
|
while (!DoneWithModifiers) {
|
|
switch (*I) {
|
|
default:
|
|
DoneWithModifiers = true;
|
|
break;
|
|
case '&': // Early clobber.
|
|
if (Type != isOutput || // Cannot early clobber anything but output.
|
|
isEarlyClobber) // Reject &&&&&&
|
|
return true;
|
|
isEarlyClobber = true;
|
|
break;
|
|
case '%': // Commutative.
|
|
if (Type == isClobber || // Cannot commute clobbers.
|
|
isCommutative) // Reject %%%%%
|
|
return true;
|
|
isCommutative = true;
|
|
break;
|
|
case '#': // Comment.
|
|
case '*': // Register preferencing.
|
|
return true; // Not supported.
|
|
}
|
|
|
|
if (!DoneWithModifiers) {
|
|
++I;
|
|
if (I == E) return true; // Just prefixes and modifiers!
|
|
}
|
|
}
|
|
|
|
// Parse the various constraints.
|
|
while (I != E) {
|
|
if (*I == '{') { // Physical register reference.
|
|
// Find the end of the register name.
|
|
StringRef::iterator ConstraintEnd = std::find(I+1, E, '}');
|
|
if (ConstraintEnd == E) return true; // "{foo"
|
|
pCodes->push_back(std::string(I, ConstraintEnd+1));
|
|
I = ConstraintEnd+1;
|
|
} else if (isdigit(static_cast<unsigned char>(*I))) { // Matching Constraint
|
|
// Maximal munch numbers.
|
|
StringRef::iterator NumStart = I;
|
|
while (I != E && isdigit(static_cast<unsigned char>(*I)))
|
|
++I;
|
|
pCodes->push_back(std::string(NumStart, I));
|
|
unsigned N = atoi(pCodes->back().c_str());
|
|
// Check that this is a valid matching constraint!
|
|
if (N >= ConstraintsSoFar.size() || ConstraintsSoFar[N].Type != isOutput||
|
|
Type != isInput)
|
|
return true; // Invalid constraint number.
|
|
|
|
// If Operand N already has a matching input, reject this. An output
|
|
// can't be constrained to the same value as multiple inputs.
|
|
if (isMultipleAlternative) {
|
|
InlineAsm::SubConstraintInfo &scInfo =
|
|
ConstraintsSoFar[N].multipleAlternatives[multipleAlternativeIndex];
|
|
if (scInfo.MatchingInput != -1)
|
|
return true;
|
|
// Note that operand #n has a matching input.
|
|
scInfo.MatchingInput = ConstraintsSoFar.size();
|
|
} else {
|
|
if (ConstraintsSoFar[N].hasMatchingInput())
|
|
return true;
|
|
// Note that operand #n has a matching input.
|
|
ConstraintsSoFar[N].MatchingInput = ConstraintsSoFar.size();
|
|
}
|
|
} else if (*I == '|') {
|
|
multipleAlternativeIndex++;
|
|
pCodes = &multipleAlternatives[multipleAlternativeIndex].Codes;
|
|
++I;
|
|
} else if (*I == '^') {
|
|
// Multi-letter constraint
|
|
// FIXME: For now assuming these are 2-character constraints.
|
|
pCodes->push_back(std::string(I+1, I+3));
|
|
I += 3;
|
|
} else {
|
|
// Single letter constraint.
|
|
pCodes->push_back(std::string(I, I+1));
|
|
++I;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// selectAlternative - Point this constraint to the alternative constraint
|
|
/// indicated by the index.
|
|
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;
|
|
|
|
// Scan the constraints string.
|
|
for (StringRef::iterator I = Constraints.begin(),
|
|
E = Constraints.end(); I != E; ) {
|
|
ConstraintInfo Info;
|
|
|
|
// Find the end of this constraint.
|
|
StringRef::iterator ConstraintEnd = std::find(I, E, ',');
|
|
|
|
if (ConstraintEnd == I || // Empty constraint like ",,"
|
|
Info.Parse(StringRef(I, ConstraintEnd-I), Result)) {
|
|
Result.clear(); // Erroneous constraint?
|
|
break;
|
|
}
|
|
|
|
Result.push_back(Info);
|
|
|
|
// ConstraintEnd may be either the next comma or the end of the string. In
|
|
// the former case, we skip the comma.
|
|
I = ConstraintEnd;
|
|
if (I != E) {
|
|
++I;
|
|
if (I == E) { Result.clear(); break; } // don't allow "xyz,"
|
|
}
|
|
}
|
|
|
|
return Result;
|
|
}
|
|
|
|
/// Verify - Verify that the specified constraint string is reasonable for the
|
|
/// specified function type, and otherwise validate the constraint string.
|
|
bool InlineAsm::Verify(FunctionType *Ty, StringRef ConstStr) {
|
|
if (Ty->isVarArg()) return false;
|
|
|
|
ConstraintInfoVector Constraints = ParseConstraints(ConstStr);
|
|
|
|
// Error parsing constraints.
|
|
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; // outputs before inputs and clobbers.
|
|
if (!Constraints[i].isIndirect) {
|
|
++NumOutputs;
|
|
break;
|
|
}
|
|
++NumIndirect;
|
|
// FALLTHROUGH for Indirect Outputs.
|
|
case InlineAsm::isInput:
|
|
if (NumClobbers) return false; // inputs before clobbers.
|
|
++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 || STy->getNumElements() != NumOutputs)
|
|
return false;
|
|
break;
|
|
}
|
|
|
|
if (Ty->getNumParams() != NumInputs) return false;
|
|
return true;
|
|
}
|
|
|