+++ /dev/null
-//===-- 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/InlineAsm.h"
-#include "ConstantsContext.h"
-#include "LLVMContextImpl.h"
-#include "llvm/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) {
-}
-
-/// Copy constructor.
-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) {
-}
-
-/// 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;
- } 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(*I)) { // Matching Constraint
- // Maximal munch numbers.
- StringRef::iterator NumStart = I;
- while (I != E && isdigit(*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 == 0 || STy->getNumElements() != NumOutputs)
- return false;
- break;
- }
-
- if (Ty->getNumParams() != NumInputs) return false;
- return true;
-}
-
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