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//===--------------- LLVMContextImpl.cpp - Implementation ------*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements LLVMContextImpl, the opaque implementation
// of LLVMContext.
//
//===----------------------------------------------------------------------===//
#include "LLVMContextImpl.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/LLVMContext.h"
using namespace llvm;
// Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
// as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
// operator== and operator!= to ensure that the DenseMap doesn't attempt to
// compare APInt's of different widths, which would violate an APInt class
// invariant which generates an assertion.
ConstantInt *LLVMContextImpl::getConstantInt(const APInt& V) {
// Get the corresponding integer type for the bit width of the value.
const IntegerType *ITy = Context.getIntegerType(V.getBitWidth());
// get an existing value or the insertion position
DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
ConstantsLock.reader_acquire();
ConstantInt *&Slot = IntConstants[Key];
ConstantsLock.reader_release();
if (!Slot) {
sys::SmartScopedWriter<true> Writer(ConstantsLock);
ConstantInt *&NewSlot = IntConstants[Key];
if (!Slot) {
NewSlot = new ConstantInt(ITy, V);
}
return NewSlot;
} else {
return Slot;
}
}
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