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95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
//===--- ItaniumManglingCanonicalizer.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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//
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// This file defines a class for computing equivalence classes of mangled names
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// given a set of equivalences between name fragments.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_ITANIUMMANGLINGCANONICALIZER_H
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#define LLVM_SUPPORT_ITANIUMMANGLINGCANONICALIZER_H
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#include <cstddef>
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#include <cstdint>
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namespace llvm {
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class StringRef;
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/// Canonicalizer for mangled names.
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///
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/// This class allows specifying a list of "equivalent" manglings. For example,
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/// you can specify that Ss is equivalent to
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/// NSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE
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/// and then manglings that refer to libstdc++'s 'std::string' will be
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/// considered equivalent to manglings that are the same except that they refer
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/// to libc++'s 'std::string'.
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///
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/// This can be used when data (eg, profiling data) is available for a version
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/// of a program built in a different configuration, with correspondingly
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/// different manglings.
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class ItaniumManglingCanonicalizer {
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public:
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ItaniumManglingCanonicalizer();
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ItaniumManglingCanonicalizer(const ItaniumManglingCanonicalizer &) = delete;
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void operator=(const ItaniumManglingCanonicalizer &) = delete;
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~ItaniumManglingCanonicalizer();
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enum class EquivalenceError {
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Success,
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/// Both the equivalent manglings have already been used as components of
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/// some other mangling we've looked at. It's too late to add this
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/// equivalence.
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ManglingAlreadyUsed,
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/// The first equivalent mangling is invalid.
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InvalidFirstMangling,
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/// The second equivalent mangling is invalid.
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InvalidSecondMangling,
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};
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enum class FragmentKind {
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/// The mangling fragment is a <name> (or a predefined <substitution>).
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Name,
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/// The mangling fragment is a <type>.
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Type,
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/// The mangling fragment is an <encoding>.
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Encoding,
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};
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/// Add an equivalence between \p First and \p Second. Both manglings must
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/// live at least as long as the canonicalizer.
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EquivalenceError addEquivalence(FragmentKind Kind, StringRef First,
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StringRef Second);
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using Key = uintptr_t;
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/// Form a canonical key for the specified mangling. They key will be the
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/// same for all equivalent manglings, and different for any two
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/// non-equivalent manglings, but is otherwise unspecified.
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///
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/// Returns Key() if (and only if) the mangling is not a valid Itanium C++
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/// ABI mangling.
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///
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/// The string denoted by Mangling must live as long as the canonicalizer.
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Key canonicalize(StringRef Mangling);
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/// Find a canonical key for the specified mangling, if one has already been
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/// formed. Otherwise returns Key().
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Key lookup(StringRef Mangling);
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private:
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struct Impl;
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Impl *P;
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};
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} // namespace llvm
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#endif // LLVM_SUPPORT_ITANIUMMANGLINGCANONICALIZER_H
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