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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
//===-- llvm/IR/ModuleSlotTracker.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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#ifndef LLVM_IR_MODULESLOTTRACKER_H
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#define LLVM_IR_MODULESLOTTRACKER_H
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#include <memory>
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namespace llvm {
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class Module;
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class Function;
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class SlotTracker;
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class Value;
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/// Manage lifetime of a slot tracker for printing IR.
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///
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/// Wrapper around the \a SlotTracker used internally by \a AsmWriter. This
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/// class allows callers to share the cost of incorporating the metadata in a
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/// module or a function.
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///
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/// If the IR changes from underneath \a ModuleSlotTracker, strings like
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/// "<badref>" will be printed, or, worse, the wrong slots entirely.
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class ModuleSlotTracker {
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/// Storage for a slot tracker.
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std::unique_ptr<SlotTracker> MachineStorage;
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bool ShouldCreateStorage = false;
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bool ShouldInitializeAllMetadata = false;
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const Module *M = nullptr;
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const Function *F = nullptr;
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SlotTracker *Machine = nullptr;
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public:
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/// Wrap a preinitialized SlotTracker.
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ModuleSlotTracker(SlotTracker &Machine, const Module *M,
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const Function *F = nullptr);
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/// Construct a slot tracker from a module.
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///
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/// If \a M is \c nullptr, uses a null slot tracker. Otherwise, initializes
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/// a slot tracker, and initializes all metadata slots. \c
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/// ShouldInitializeAllMetadata defaults to true because this is expected to
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/// be shared between multiple callers, and otherwise MDNode references will
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/// not match up.
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explicit ModuleSlotTracker(const Module *M,
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bool ShouldInitializeAllMetadata = true);
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/// Destructor to clean up storage.
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~ModuleSlotTracker();
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/// Lazily creates a slot tracker.
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SlotTracker *getMachine();
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const Module *getModule() const { return M; }
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const Function *getCurrentFunction() const { return F; }
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/// Incorporate the given function.
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///
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/// Purge the currently incorporated function and incorporate \c F. If \c F
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/// is currently incorporated, this is a no-op.
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void incorporateFunction(const Function &F);
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/// Return the slot number of the specified local value.
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///
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/// A function that defines this value should be incorporated prior to calling
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/// this method.
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/// Return -1 if the value is not in the function's SlotTracker.
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int getLocalSlot(const Value *V);
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};
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} // end namespace llvm
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#endif
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