mirror of
https://github.com/c64scene-ar/llvm-6502.git
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into their new header subdirectory: include/llvm/IR. This matches the directory structure of lib, and begins to correct a long standing point of file layout clutter in LLVM. There are still more header files to move here, but I wanted to handle them in separate commits to make tracking what files make sense at each layer easier. The only really questionable files here are the target intrinsic tablegen files. But that's a battle I'd rather not fight today. I've updated both CMake and Makefile build systems (I think, and my tests think, but I may have missed something). I've also re-sorted the includes throughout the project. I'll be committing updates to Clang, DragonEgg, and Polly momentarily. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171366 91177308-0d34-0410-b5e6-96231b3b80d8
296 lines
9.4 KiB
C++
296 lines
9.4 KiB
C++
//===-- InlineAsm.cpp - Implement the InlineAsm class ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the InlineAsm class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/InlineAsm.h"
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#include "ConstantsContext.h"
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#include "LLVMContextImpl.h"
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#include "llvm/IR/DerivedTypes.h"
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#include <algorithm>
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#include <cctype>
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using namespace llvm;
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// Implement the first virtual method in this class in this file so the
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// InlineAsm vtable is emitted here.
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InlineAsm::~InlineAsm() {
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}
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InlineAsm *InlineAsm::get(FunctionType *Ty, StringRef AsmString,
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StringRef Constraints, bool hasSideEffects,
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bool isAlignStack, AsmDialect asmDialect) {
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InlineAsmKeyType Key(AsmString, Constraints, hasSideEffects, isAlignStack,
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asmDialect);
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LLVMContextImpl *pImpl = Ty->getContext().pImpl;
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return pImpl->InlineAsms.getOrCreate(PointerType::getUnqual(Ty), Key);
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}
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InlineAsm::InlineAsm(PointerType *Ty, const std::string &asmString,
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const std::string &constraints, bool hasSideEffects,
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bool isAlignStack, AsmDialect asmDialect)
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: Value(Ty, Value::InlineAsmVal),
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AsmString(asmString), Constraints(constraints),
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HasSideEffects(hasSideEffects), IsAlignStack(isAlignStack),
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Dialect(asmDialect) {
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// Do various checks on the constraint string and type.
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assert(Verify(getFunctionType(), constraints) &&
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"Function type not legal for constraints!");
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}
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void InlineAsm::destroyConstant() {
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getType()->getContext().pImpl->InlineAsms.remove(this);
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delete this;
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}
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FunctionType *InlineAsm::getFunctionType() const {
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return cast<FunctionType>(getType()->getElementType());
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}
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///Default constructor.
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InlineAsm::ConstraintInfo::ConstraintInfo() :
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Type(isInput), isEarlyClobber(false),
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MatchingInput(-1), isCommutative(false),
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isIndirect(false), isMultipleAlternative(false),
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currentAlternativeIndex(0) {
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}
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/// Copy constructor.
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InlineAsm::ConstraintInfo::ConstraintInfo(const ConstraintInfo &other) :
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Type(other.Type), isEarlyClobber(other.isEarlyClobber),
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MatchingInput(other.MatchingInput), isCommutative(other.isCommutative),
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isIndirect(other.isIndirect), Codes(other.Codes),
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isMultipleAlternative(other.isMultipleAlternative),
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multipleAlternatives(other.multipleAlternatives),
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currentAlternativeIndex(other.currentAlternativeIndex) {
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}
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/// Parse - Analyze the specified string (e.g. "==&{eax}") and fill in the
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/// fields in this structure. If the constraint string is not understood,
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/// return true, otherwise return false.
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bool InlineAsm::ConstraintInfo::Parse(StringRef Str,
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InlineAsm::ConstraintInfoVector &ConstraintsSoFar) {
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StringRef::iterator I = Str.begin(), E = Str.end();
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unsigned multipleAlternativeCount = Str.count('|') + 1;
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unsigned multipleAlternativeIndex = 0;
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ConstraintCodeVector *pCodes = &Codes;
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// Initialize
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isMultipleAlternative = (multipleAlternativeCount > 1 ? true : false);
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if (isMultipleAlternative) {
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multipleAlternatives.resize(multipleAlternativeCount);
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pCodes = &multipleAlternatives[0].Codes;
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}
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Type = isInput;
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isEarlyClobber = false;
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MatchingInput = -1;
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isCommutative = false;
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isIndirect = false;
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currentAlternativeIndex = 0;
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// Parse prefixes.
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if (*I == '~') {
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Type = isClobber;
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++I;
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} else if (*I == '=') {
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++I;
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Type = isOutput;
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}
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if (*I == '*') {
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isIndirect = true;
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++I;
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}
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if (I == E) return true; // Just a prefix, like "==" or "~".
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// Parse the modifiers.
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bool DoneWithModifiers = false;
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while (!DoneWithModifiers) {
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switch (*I) {
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default:
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DoneWithModifiers = true;
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break;
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case '&': // Early clobber.
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if (Type != isOutput || // Cannot early clobber anything but output.
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isEarlyClobber) // Reject &&&&&&
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return true;
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isEarlyClobber = true;
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break;
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case '%': // Commutative.
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if (Type == isClobber || // Cannot commute clobbers.
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isCommutative) // Reject %%%%%
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return true;
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isCommutative = true;
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break;
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case '#': // Comment.
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case '*': // Register preferencing.
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return true; // Not supported.
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}
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if (!DoneWithModifiers) {
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++I;
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if (I == E) return true; // Just prefixes and modifiers!
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}
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}
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// Parse the various constraints.
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while (I != E) {
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if (*I == '{') { // Physical register reference.
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// Find the end of the register name.
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StringRef::iterator ConstraintEnd = std::find(I+1, E, '}');
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if (ConstraintEnd == E) return true; // "{foo"
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pCodes->push_back(std::string(I, ConstraintEnd+1));
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I = ConstraintEnd+1;
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} else if (isdigit(*I)) { // Matching Constraint
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// Maximal munch numbers.
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StringRef::iterator NumStart = I;
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while (I != E && isdigit(*I))
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++I;
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pCodes->push_back(std::string(NumStart, I));
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unsigned N = atoi(pCodes->back().c_str());
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// Check that this is a valid matching constraint!
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if (N >= ConstraintsSoFar.size() || ConstraintsSoFar[N].Type != isOutput||
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Type != isInput)
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return true; // Invalid constraint number.
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// If Operand N already has a matching input, reject this. An output
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// can't be constrained to the same value as multiple inputs.
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if (isMultipleAlternative) {
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InlineAsm::SubConstraintInfo &scInfo =
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ConstraintsSoFar[N].multipleAlternatives[multipleAlternativeIndex];
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if (scInfo.MatchingInput != -1)
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return true;
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// Note that operand #n has a matching input.
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scInfo.MatchingInput = ConstraintsSoFar.size();
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} else {
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if (ConstraintsSoFar[N].hasMatchingInput())
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return true;
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// Note that operand #n has a matching input.
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ConstraintsSoFar[N].MatchingInput = ConstraintsSoFar.size();
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}
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} else if (*I == '|') {
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multipleAlternativeIndex++;
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pCodes = &multipleAlternatives[multipleAlternativeIndex].Codes;
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++I;
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} else if (*I == '^') {
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// Multi-letter constraint
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// FIXME: For now assuming these are 2-character constraints.
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pCodes->push_back(std::string(I+1, I+3));
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I += 3;
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} else {
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// Single letter constraint.
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pCodes->push_back(std::string(I, I+1));
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++I;
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}
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}
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return false;
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}
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/// selectAlternative - Point this constraint to the alternative constraint
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/// indicated by the index.
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void InlineAsm::ConstraintInfo::selectAlternative(unsigned index) {
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if (index < multipleAlternatives.size()) {
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currentAlternativeIndex = index;
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InlineAsm::SubConstraintInfo &scInfo =
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multipleAlternatives[currentAlternativeIndex];
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MatchingInput = scInfo.MatchingInput;
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Codes = scInfo.Codes;
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}
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}
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InlineAsm::ConstraintInfoVector
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InlineAsm::ParseConstraints(StringRef Constraints) {
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ConstraintInfoVector Result;
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// Scan the constraints string.
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for (StringRef::iterator I = Constraints.begin(),
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E = Constraints.end(); I != E; ) {
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ConstraintInfo Info;
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// Find the end of this constraint.
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StringRef::iterator ConstraintEnd = std::find(I, E, ',');
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if (ConstraintEnd == I || // Empty constraint like ",,"
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Info.Parse(StringRef(I, ConstraintEnd-I), Result)) {
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Result.clear(); // Erroneous constraint?
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break;
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}
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Result.push_back(Info);
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// ConstraintEnd may be either the next comma or the end of the string. In
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// the former case, we skip the comma.
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I = ConstraintEnd;
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if (I != E) {
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++I;
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if (I == E) { Result.clear(); break; } // don't allow "xyz,"
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}
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}
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return Result;
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}
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/// Verify - Verify that the specified constraint string is reasonable for the
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/// specified function type, and otherwise validate the constraint string.
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bool InlineAsm::Verify(FunctionType *Ty, StringRef ConstStr) {
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if (Ty->isVarArg()) return false;
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ConstraintInfoVector Constraints = ParseConstraints(ConstStr);
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// Error parsing constraints.
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if (Constraints.empty() && !ConstStr.empty()) return false;
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unsigned NumOutputs = 0, NumInputs = 0, NumClobbers = 0;
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unsigned NumIndirect = 0;
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for (unsigned i = 0, e = Constraints.size(); i != e; ++i) {
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switch (Constraints[i].Type) {
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case InlineAsm::isOutput:
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if ((NumInputs-NumIndirect) != 0 || NumClobbers != 0)
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return false; // outputs before inputs and clobbers.
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if (!Constraints[i].isIndirect) {
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++NumOutputs;
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break;
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}
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++NumIndirect;
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// FALLTHROUGH for Indirect Outputs.
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case InlineAsm::isInput:
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if (NumClobbers) return false; // inputs before clobbers.
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++NumInputs;
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break;
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case InlineAsm::isClobber:
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++NumClobbers;
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break;
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}
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}
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switch (NumOutputs) {
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case 0:
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if (!Ty->getReturnType()->isVoidTy()) return false;
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break;
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case 1:
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if (Ty->getReturnType()->isStructTy()) return false;
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break;
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default:
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StructType *STy = dyn_cast<StructType>(Ty->getReturnType());
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if (STy == 0 || STy->getNumElements() != NumOutputs)
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return false;
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break;
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}
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if (Ty->getNumParams() != NumInputs) return false;
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return true;
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}
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