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9a61a42713
Expose enough of the IR-level `SlotTracker` so that `MachineFunction::print()` can use a single one for printing `BasicBlock`s. Next step would be to lift this through a few more APIs so that we can make other print methods faster. Fixes PR23865, changing the runtime of `llc -print-machineinstrs` from many minutes (killed after 3 minutes, but it wasn't very close) to 13 seconds for a 502185 line dump. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240842 91177308-0d34-0410-b5e6-96231b3b80d8
64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
//===-- llvm/IR/ModuleSlotTracker.h -----------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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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/// 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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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.
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explicit ModuleSlotTracker(const Module *M);
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/// Destructor to clean up storage.
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~ModuleSlotTracker();
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SlotTracker *getMachine() const { return Machine; }
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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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};
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} // end namespace llvm
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#endif
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