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3a5b1043d0
This moves most of GlobalOpt's constructor optimization
code out of GlobalOpt into Transforms/Utils/CDtorUtils.{h,cpp}. The
public interface is a single function OptimizeGlobalCtorsList() that
takes a predicate returning which constructors to remove.
GlobalOpt calls this with a function that statically evaluates all
constructors, just like it did before. This part of the change is
behavior-preserving.
Also add a call to this from GlobalDCE with a filter that removes global
constructors that contain a "ret" instruction and nothing else – this
fixes PR19590.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207856 91177308-0d34-0410-b5e6-96231b3b80d8
36 lines
1.0 KiB
C++
36 lines
1.0 KiB
C++
//===- CtorUtils.h - Helpers for working with global_ctors ------*- 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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//
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// This file defines functions that are used to process llvm.global_ctors.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_CTOR_UTILS_H
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#define LLVM_TRANSFORMS_UTILS_CTOR_UTILS_H
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#include <functional>
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#include <vector>
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namespace llvm {
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class GlobalVariable;
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class Function;
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class Module;
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typedef bool (*ShouldRemoveCtor)(void *, Function *);
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/// Call "ShouldRemove" for every entry in M's global_ctor list and remove the
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/// entries for which it returns true. Return true if anything changed.
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bool optimizeGlobalCtorsList(Module &M, ShouldRemoveCtor ShouldRemove,
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void *Context);
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} // End llvm namespace
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#endif
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