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4473c4ce87
Summary: Passing a nullptr to memcpy is UB. Reviewers: ioeric Subscribers: llvm-commits, cfe-commits Differential Revision: https://reviews.llvm.org/D50966 llvm-svn: 340170
28 lines
854 B
C++
28 lines
854 B
C++
//===-- StringSaver.cpp ---------------------------------------------------===//
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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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#include "llvm/Support/StringSaver.h"
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using namespace llvm;
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StringRef StringSaver::save(StringRef S) {
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char *P = Alloc.Allocate<char>(S.size() + 1);
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if (!S.empty())
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memcpy(P, S.data(), S.size());
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P[S.size()] = '\0';
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return StringRef(P, S.size());
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}
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StringRef UniqueStringSaver::save(StringRef S) {
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auto R = Unique.insert(S);
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if (R.second) // cache miss, need to actually save the string
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*R.first = Strings.save(S); // safe replacement with equal value
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return *R.first;
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}
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