forked from OSchip/llvm-project
131 lines
4.0 KiB
C++
131 lines
4.0 KiB
C++
//===--------------- LLVMContextImpl.cpp - Implementation ------*- C++ -*--===//
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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 LLVMContextImpl, the opaque implementation
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// of LLVMContext.
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//
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//===----------------------------------------------------------------------===//
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#include "LLVMContextImpl.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/MDNode.h"
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using namespace llvm;
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// Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
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// as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
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// operator== and operator!= to ensure that the DenseMap doesn't attempt to
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// compare APInt's of different widths, which would violate an APInt class
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// invariant which generates an assertion.
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ConstantInt *LLVMContextImpl::getConstantInt(const APInt& V) {
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// Get the corresponding integer type for the bit width of the value.
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const IntegerType *ITy = Context.getIntegerType(V.getBitWidth());
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// get an existing value or the insertion position
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DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
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ConstantsLock.reader_acquire();
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ConstantInt *&Slot = IntConstants[Key];
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ConstantsLock.reader_release();
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if (!Slot) {
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sys::SmartScopedWriter<true> Writer(ConstantsLock);
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ConstantInt *&NewSlot = IntConstants[Key];
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if (!Slot) {
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NewSlot = new ConstantInt(ITy, V);
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}
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return NewSlot;
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} else {
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return Slot;
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}
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}
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ConstantFP *LLVMContextImpl::getConstantFP(const APFloat &V) {
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DenseMapAPFloatKeyInfo::KeyTy Key(V);
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ConstantsLock.reader_acquire();
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ConstantFP *&Slot = FPConstants[Key];
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ConstantsLock.reader_release();
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if (!Slot) {
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sys::SmartScopedWriter<true> Writer(ConstantsLock);
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ConstantFP *&NewSlot = FPConstants[Key];
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if (!NewSlot) {
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const Type *Ty;
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if (&V.getSemantics() == &APFloat::IEEEsingle)
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Ty = Type::FloatTy;
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else if (&V.getSemantics() == &APFloat::IEEEdouble)
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Ty = Type::DoubleTy;
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else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
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Ty = Type::X86_FP80Ty;
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else if (&V.getSemantics() == &APFloat::IEEEquad)
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Ty = Type::FP128Ty;
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else {
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assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
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"Unknown FP format");
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Ty = Type::PPC_FP128Ty;
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}
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NewSlot = new ConstantFP(Ty, V);
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}
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return NewSlot;
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}
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return Slot;
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}
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MDString *LLVMContextImpl::getMDString(const char *StrBegin,
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const char *StrEnd) {
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sys::SmartScopedWriter<true> Writer(ConstantsLock);
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StringMapEntry<MDString *> &Entry = MDStringCache.GetOrCreateValue(
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StrBegin, StrEnd);
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MDString *&S = Entry.getValue();
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if (!S) S = new MDString(Entry.getKeyData(),
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Entry.getKeyData() + Entry.getKeyLength());
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return S;
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}
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MDNode *LLVMContextImpl::getMDNode(Value*const* Vals, unsigned NumVals) {
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FoldingSetNodeID ID;
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for (unsigned i = 0; i != NumVals; ++i)
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ID.AddPointer(Vals[i]);
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ConstantsLock.reader_acquire();
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void *InsertPoint;
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MDNode *N = MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
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ConstantsLock.reader_release();
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if (!N) {
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sys::SmartScopedWriter<true> Writer(ConstantsLock);
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N = MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
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if (!N) {
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// InsertPoint will have been set by the FindNodeOrInsertPos call.
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N = new(0) MDNode(Vals, NumVals);
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MDNodeSet.InsertNode(N, InsertPoint);
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}
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}
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return N;
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}
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// *** erase methods ***
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void LLVMContextImpl::erase(MDString *M) {
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sys::SmartScopedWriter<true> Writer(ConstantsLock);
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MDStringCache.erase(MDStringCache.find(M->StrBegin, M->StrEnd));
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}
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void LLVMContextImpl::erase(MDNode *M) {
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sys::SmartScopedWriter<true> Writer(ConstantsLock);
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MDNodeSet.RemoveNode(M);
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}
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