6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
//===--- APNumericStorage.h - Store APInt/APFloat in ASTContext -*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_AST_APNUMERICSTORAGE_H
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#define LLVM_CLANG_AST_APNUMERICSTORAGE_H
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#include "llvm/ADT/APFloat.h"
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#include "llvm/ADT/APInt.h"
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namespace clang {
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class ASTContext;
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/// Used by IntegerLiteral/FloatingLiteral/EnumConstantDecl to store the
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/// numeric without leaking memory.
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///
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/// For large floats/integers, APFloat/APInt will allocate memory from the heap
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/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator
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/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with
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/// the APFloat/APInt values will never get freed. APNumericStorage uses
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/// ASTContext's allocator for memory allocation.
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class APNumericStorage {
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union {
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uint64_t VAL; ///< Used to store the <= 64 bits integer value.
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uint64_t *pVal; ///< Used to store the >64 bits integer value.
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};
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unsigned BitWidth;
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bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; }
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APNumericStorage(const APNumericStorage &) = delete;
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void operator=(const APNumericStorage &) = delete;
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protected:
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APNumericStorage() : VAL(0), BitWidth(0) {}
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llvm::APInt getIntValue() const {
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unsigned NumWords = llvm::APInt::getNumWords(BitWidth);
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if (NumWords > 1)
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return llvm::APInt(BitWidth, NumWords, pVal);
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else
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return llvm::APInt(BitWidth, VAL);
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}
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void setIntValue(const ASTContext &C, const llvm::APInt &Val);
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};
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class APIntStorage : private APNumericStorage {
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public:
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llvm::APInt getValue() const { return getIntValue(); }
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void setValue(const ASTContext &C, const llvm::APInt &Val) {
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setIntValue(C, Val);
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}
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};
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class APFloatStorage : private APNumericStorage {
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public:
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llvm::APFloat getValue(const llvm::fltSemantics &Semantics) const {
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return llvm::APFloat(Semantics, getIntValue());
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}
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void setValue(const ASTContext &C, const llvm::APFloat &Val) {
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setIntValue(C, Val.bitcastToAPInt());
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}
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};
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} // end namespace clang
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#endif // LLVM_CLANG_AST_APNUMERICSTORAGE_H
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