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013daef6ec
This patch moves some common utility functions out of IPSCCP and makes them available globally. The functions determine if interprocedural data-flow analyses can propagate information through function returns, arguments, and global variables. Differential Revision: https://reviews.llvm.org/D37638 llvm-svn: 315719
42 lines
1.6 KiB
C++
42 lines
1.6 KiB
C++
//===-- ValueLatticeUtils.h - Utils for solving lattices --------*- 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 declares common functions useful for performing data-flow analyses
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// that propagate values across function boundaries.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_VALUELATTICEUTILS_H
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#define LLVM_ANALYSIS_VALUELATTICEUTILS_H
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namespace llvm {
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class Function;
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class GlobalVariable;
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/// Determine if the values of the given function's arguments can be tracked
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/// interprocedurally. The value of an argument can be tracked if the function
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/// has local linkage and its address is not taken.
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bool canTrackArgumentsInterprocedurally(Function *F);
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/// Determine if the values of the given function's returns can be tracked
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/// interprocedurally. Return values can be tracked if the function has an
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/// exact definition and it doesn't have the "naked" attribute. Naked functions
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/// may contain assembly code that returns untrackable values.
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bool canTrackReturnsInterprocedurally(Function *F);
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/// Determine if the value maintained in the given global variable can be
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/// tracked interprocedurally. A value can be tracked if the global variable
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/// has local linkage and is only used by non-volatile loads and stores.
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bool canTrackGlobalVariableInterprocedurally(GlobalVariable *GV);
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} // end namespace llvm
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#endif // LLVM_ANALYSIS_VALUELATTICEUTILS_H
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