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📄 AbsoluteAtom.h(1.27 KB)
📄 ArchiveLibraryFile.h(1.57 KB)
📄 Atom.h(3.7 KB)
📄 DefinedAtom.h(14.77 KB)
📄 Error.h(2.01 KB)
📄 File.h(9.15 KB)
📄 Instrumentation.h(3.26 KB)
📄 LinkingContext.h(10.19 KB)
📄 Node.h(1.82 KB)
📄 Pass.h(1.4 KB)
📄 PassManager.h(1.27 KB)
📄 Reader.h(5.84 KB)
📄 Reference.h(4.09 KB)
📄 Resolver.h(3.31 KB)
📄 SharedLibraryAtom.h(1.46 KB)
📄 SharedLibraryFile.h(1.99 KB)
📄 Simple.h(8.34 KB)
📄 SymbolTable.h(2.85 KB)
📄 UndefinedAtom.h(2.28 KB)
📄 Writer.h(1.46 KB)

Editing: UndefinedAtom.h

//===- Core/UndefinedAtom.h - An Undefined Atom ---------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef LLD_CORE_UNDEFINED_ATOM_H
#define LLD_CORE_UNDEFINED_ATOM_H

#include "lld/Core/Atom.h"

namespace lld {

/// An UndefinedAtom has no content.
/// It exists as a placeholder for a future atom.
class UndefinedAtom : public Atom {
public:
  /// Whether this undefined symbol needs to be resolved,
  /// or whether it can just evaluate to nullptr.
  /// This concept is often called "weak", but that term
  /// is overloaded to mean other things too.
  enum CanBeNull {
    /// Normal symbols must be resolved at build time
    canBeNullNever,

/// This symbol can be missing at runtime and will evaluate to nullptr.
    /// That is, the static linker still must find a definition (usually
    /// is some shared library), but at runtime, the dynamic loader
    /// will allow the symbol to be missing and resolved to nullptr.
    ///
    /// On Darwin this is generated using a function prototype with
    /// __attribute__((weak_import)).
    /// On linux this is generated using a function prototype with
    ///  __attribute__((weak)).
    /// On Windows this feature is not supported.
    canBeNullAtRuntime,

/// This symbol can be missing at build time.
    /// That is, the static linker will not error if a definition for
    /// this symbol is not found at build time. Instead, the linker
    /// will build an executable that lets the dynamic loader find the
    /// symbol at runtime.
    /// This feature is not supported on Darwin nor Windows.
    /// On linux this is generated using a function prototype with
    ///  __attribute__((weak)).
    canBeNullAtBuildtime
  };

virtual CanBeNull canBeNull() const = 0;

static bool classof(const Atom *a) {
    return a->definition() == definitionUndefined;
  }

static bool classof(const UndefinedAtom *) { return true; }

protected:
  UndefinedAtom() : Atom(definitionUndefined) {}

~UndefinedAtom() override = default;
};

} // namespace lld

#endif // LLD_CORE_UNDEFINED_ATOM_H

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