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8e27cb2f34
This was originally a pointer to support pass managers which didn't use AnalysisManagers. However, that doesn't realistically come up much and the complexity of supporting it doesn't really make sense. In fact, *many* parts of the pass manager were just assuming the pointer was never null already. This at least makes it much more explicit and clear. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@263219 91177308-0d34-0410-b5e6-96231b3b80d8
43 lines
1.7 KiB
C++
43 lines
1.7 KiB
C++
//===-- FunctionAttrs.h - Compute function attrs --------------------------===//
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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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/// \file
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/// Provides passes for computing function attributes based on interprocedural
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/// analyses.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_IPO_FUNCTIONATTRS_H
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#define LLVM_TRANSFORMS_IPO_FUNCTIONATTRS_H
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#include "llvm/Analysis/LazyCallGraph.h"
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#include "llvm/Analysis/CGSCCPassManager.h"
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#include "llvm/IR/PassManager.h"
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namespace llvm {
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/// Computes function attributes in post-order over the call graph.
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///
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/// By operating in post-order, this pass computes precise attributes for
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/// called functions prior to processsing their callers. This "bottom-up"
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/// approach allows powerful interprocedural inference of function attributes
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/// like memory access patterns, etc. It can discover functions that do not
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/// access memory, or only read memory, and give them the readnone/readonly
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/// attribute. It also discovers function arguments that are not captured by
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/// the function and marks them with the nocapture attribute.
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struct PostOrderFunctionAttrsPass : PassInfoMixin<PostOrderFunctionAttrsPass> {
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PreservedAnalyses run(LazyCallGraph::SCC &C, CGSCCAnalysisManager &AM);
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};
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/// Create a legacy pass manager instance of a pass to compute function attrs
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/// in post-order.
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Pass *createPostOrderFunctionAttrsLegacyPass();
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}
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#endif // LLVM_TRANSFORMS_IPO_FUNCTIONATTRS_H
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