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57 lines
2.4 KiB
C++
57 lines
2.4 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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/// A pass to do RPO deduction and propagation of function attributes.
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///
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/// This pass provides a general RPO or "top down" propagation of
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/// function attributes. For a few (rare) cases, we can deduce significantly
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/// more about function attributes by working in RPO, so this pass
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/// provides the compliment to the post-order pass above where the majority of
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/// deduction is performed.
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// FIXME: Currently there is no RPO CGSCC pass structure to slide into and so
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// this is a boring module pass, but eventually it should be an RPO CGSCC pass
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// when such infrastructure is available.
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class ReversePostOrderFunctionAttrsPass
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: public PassInfoMixin<ReversePostOrderFunctionAttrsPass> {
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public:
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PreservedAnalyses run(Module &M, AnalysisManager<Module> &AM);
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};
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}
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#endif // LLVM_TRANSFORMS_IPO_FUNCTIONATTRS_H
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