forked from OSchip/llvm-project
57 lines
1.5 KiB
C++
57 lines
1.5 KiB
C++
#ifndef TOOLS_LLVM_DWP_DWPSTRINGPOOL
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#define TOOLS_LLVM_DWP_DWPSTRINGPOOL
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCStreamer.h"
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#include <cassert>
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namespace llvm {
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class DWPStringPool {
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struct CStrDenseMapInfo {
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static inline const char *getEmptyKey() {
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return reinterpret_cast<const char *>(~static_cast<uintptr_t>(0));
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}
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static inline const char *getTombstoneKey() {
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return reinterpret_cast<const char *>(~static_cast<uintptr_t>(1));
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}
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static unsigned getHashValue(const char *Val) {
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assert(Val != getEmptyKey() && "Cannot hash the empty key!");
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assert(Val != getTombstoneKey() && "Cannot hash the tombstone key!");
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return (unsigned)hash_value(StringRef(Val));
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}
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static bool isEqual(const char *LHS, const char *RHS) {
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if (RHS == getEmptyKey())
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return LHS == getEmptyKey();
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if (RHS == getTombstoneKey())
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return LHS == getTombstoneKey();
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return strcmp(LHS, RHS) == 0;
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}
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};
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MCStreamer &Out;
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MCSection *Sec;
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DenseMap<const char *, uint32_t, CStrDenseMapInfo> Pool;
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uint32_t Offset = 0;
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public:
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DWPStringPool(MCStreamer &Out, MCSection *Sec) : Out(Out), Sec(Sec) {}
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uint32_t getOffset(const char *Str, unsigned Length) {
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assert(strlen(Str) + 1 == Length && "Ensure length hint is correct");
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auto Pair = Pool.insert(std::make_pair(Str, Offset));
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if (Pair.second) {
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Out.SwitchSection(Sec);
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Out.emitBytes(StringRef(Str, Length));
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Offset += Length;
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}
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return Pair.first->second;
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}
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};
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}
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#endif
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