1 //===--- ItaniumManglingCanonicalizer.h -------------------------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file defines a class for computing equivalence classes of mangled names
10 // given a set of equivalences between name fragments.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_SUPPORT_ITANIUMMANGLINGCANONICALIZER_H
15 #define LLVM_SUPPORT_ITANIUMMANGLINGCANONICALIZER_H
24 /// Canonicalizer for mangled names.
26 /// This class allows specifying a list of "equivalent" manglings. For example,
27 /// you can specify that Ss is equivalent to
28 /// NSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE
29 /// and then manglings that refer to libstdc++'s 'std::string' will be
30 /// considered equivalent to manglings that are the same except that they refer
31 /// to libc++'s 'std::string'.
33 /// This can be used when data (eg, profiling data) is available for a version
34 /// of a program built in a different configuration, with correspondingly
35 /// different manglings.
36 class ItaniumManglingCanonicalizer {
38 ItaniumManglingCanonicalizer();
39 ItaniumManglingCanonicalizer(const ItaniumManglingCanonicalizer &) = delete;
40 void operator=(const ItaniumManglingCanonicalizer &) = delete;
41 ~ItaniumManglingCanonicalizer();
43 enum class EquivalenceError {
46 /// Both the equivalent manglings have already been used as components of
47 /// some other mangling we've looked at. It's too late to add this
51 /// The first equivalent mangling is invalid.
54 /// The second equivalent mangling is invalid.
55 InvalidSecondMangling,
58 enum class FragmentKind {
59 /// The mangling fragment is a <name> (or a predefined <substitution>).
61 /// The mangling fragment is a <type>.
63 /// The mangling fragment is an <encoding>.
67 /// Add an equivalence between \p First and \p Second. Both manglings must
68 /// live at least as long as the canonicalizer.
69 EquivalenceError addEquivalence(FragmentKind Kind, StringRef First,
72 using Key = uintptr_t;
74 /// Form a canonical key for the specified mangling. They key will be the
75 /// same for all equivalent manglings, and different for any two
76 /// non-equivalent manglings, but is otherwise unspecified.
78 /// Returns Key() if (and only if) the mangling is not a valid Itanium C++
81 /// The string denoted by Mangling must live as long as the canonicalizer.
82 Key canonicalize(StringRef Mangling);
84 /// Find a canonical key for the specified mangling, if one has already been
85 /// formed. Otherwise returns Key().
86 Key lookup(StringRef Mangling);
94 #endif // LLVM_SUPPORT_ITANIUMMANGLINGCANONICALIZER_H