6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
//===- NonRelocatableStringpool.h -------------------------------*- 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_CODEGEN_NONRELOCATABLESTRINGPOOL_H
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#define LLVM_CODEGEN_NONRELOCATABLESTRINGPOOL_H
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#include "llvm/CodeGen/DwarfStringPoolEntry.h"
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#include "llvm/Support/Allocator.h"
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#include <cstdint>
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#include <vector>
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namespace llvm {
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/// A string table that doesn't need relocations.
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///
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/// Use this class when a string table doesn't need relocations.
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/// This class provides this ability by just associating offsets with strings.
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class NonRelocatableStringpool {
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public:
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/// Entries are stored into the StringMap and simply linked together through
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/// the second element of this pair in order to keep track of insertion
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/// order.
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using MapTy = StringMap<DwarfStringPoolEntry, BumpPtrAllocator>;
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NonRelocatableStringpool(bool PutEmptyString = false) {
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if (PutEmptyString)
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getEntry("");
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}
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DwarfStringPoolEntryRef getEntry(StringRef S);
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/// Get the offset of string \p S in the string table. This can insert a new
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/// element or return the offset of a pre-existing one.
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uint64_t getStringOffset(StringRef S) { return getEntry(S).getOffset(); }
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/// Get permanent storage for \p S (but do not necessarily emit \p S in the
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/// output section). A latter call to getStringOffset() with the same string
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/// will chain it though.
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///
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/// \returns The StringRef that points to permanent storage to use
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/// in place of \p S.
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StringRef internString(StringRef S);
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uint64_t getSize() { return CurrentEndOffset; }
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/// Return the list of strings to be emitted. This does not contain the
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/// strings which were added via internString only.
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std::vector<DwarfStringPoolEntryRef> getEntriesForEmission() const;
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private:
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MapTy Strings;
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uint64_t CurrentEndOffset = 0;
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unsigned NumEntries = 0;
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};
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/// Helper for making strong types.
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template <typename T, typename S> class StrongType : public T {
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public:
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template <typename... Args>
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explicit StrongType(Args... A) : T(std::forward<Args>(A)...) {}
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};
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/// It's very easy to introduce bugs by passing the wrong string pool.
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/// By using strong types the interface enforces that the right
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/// kind of pool is used.
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struct UniqueTag {};
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struct OffsetsTag {};
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using UniquingStringPool = StrongType<NonRelocatableStringpool, UniqueTag>;
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using OffsetsStringPool = StrongType<NonRelocatableStringpool, OffsetsTag>;
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} // end namespace llvm
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#endif // LLVM_CODEGEN_NONRELOCATABLESTRINGPOOL_H
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