forked from OSchip/llvm-project
76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
//===- NonRelocatableStringpool.h - A simple stringpool --------*- 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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#ifndef LLVM_TOOLS_DSYMUTIL_NONRELOCATABLESTRINGPOOL_H
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#define LLVM_TOOLS_DSYMUTIL_NONRELOCATABLESTRINGPOOL_H
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/Allocator.h"
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#include <cstdint>
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#include <utility>
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namespace llvm {
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namespace dsymutil {
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/// \brief A string table that doesn't need relocations.
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///
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/// We are doing a final link, no need for a string table that
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/// has relocation entries for every reference to it. This class
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/// provides this ablitity by just associating offsets with
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/// strings.
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class NonRelocatableStringpool {
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public:
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/// \brief Entries are stored into the StringMap and simply linked
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/// together through the second element of this pair in order to
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/// keep track of insertion order.
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using MapTy =
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StringMap<std::pair<uint32_t, StringMapEntryBase *>, BumpPtrAllocator>;
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NonRelocatableStringpool() : Sentinel(0), Last(&Sentinel) {
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// Legacy dsymutil puts an empty string at the start of the line
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// table.
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getStringOffset("");
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}
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/// \brief Get the offset of string \p S in the string table. This
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/// can insert a new element or return the offset of a preexisitng
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/// one.
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uint32_t getStringOffset(StringRef S);
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/// \brief Get permanent storage for \p S (but do not necessarily
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/// emit \p S in the output section).
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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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// \brief Return the first entry of the string table.
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const MapTy::MapEntryTy *getFirstEntry() const {
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return getNextEntry(&Sentinel);
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}
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// \brief Get the entry following \p E in the string table or null
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// if \p E was the last entry.
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const MapTy::MapEntryTy *getNextEntry(const MapTy::MapEntryTy *E) const {
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return static_cast<const MapTy::MapEntryTy *>(E->getValue().second);
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}
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uint64_t getSize() { return CurrentEndOffset; }
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private:
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MapTy Strings;
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uint32_t CurrentEndOffset = 0;
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MapTy::MapEntryTy Sentinel, *Last;
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};
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} // end namespace dsymutil
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} // end namespace llvm
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#endif // LLVM_TOOLS_DSYMUTIL_NONRELOCATABLESTRINGPOOL_H
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