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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12294 91177308-0d34-0410-b5e6-96231b3b80d8
64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
//===- llvm/Analysis/Expressions.h - Expression Analysis Utils --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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 a package of expression analysis utilties:
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//
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// ClassifyExpr: Analyze an expression to determine the complexity of the
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// expression, and which other variables it depends on.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_EXPRESSIONS_H
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#define LLVM_ANALYSIS_EXPRESSIONS_H
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namespace llvm {
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class Type;
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class Value;
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class ConstantInt;
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struct ExprType;
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/// ClassifyExpr - Analyze an expression to determine the complexity of the
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/// expression, and which other values it depends on.
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///
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ExprType ClassifyExpr(Value *Expr);
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/// ExprType Class - Represent an expression of the form CONST*VAR+CONST
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/// or simpler. The expression form that yields the least information about the
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/// expression is just the Linear form with no offset.
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///
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struct ExprType {
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enum ExpressionType {
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Constant, // Expr is a simple constant, Offset is value
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Linear, // Expr is linear expr, Value is Var+Offset
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ScaledLinear, // Expr is scaled linear exp, Value is Scale*Var+Offset
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} ExprTy;
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const ConstantInt *Offset; // Offset of expr, or null if 0
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Value *Var; // Var referenced, if Linear or above (null if 0)
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const ConstantInt *Scale; // Scale of var if ScaledLinear expr (null if 1)
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inline ExprType(const ConstantInt *CPV = 0) {
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Offset = CPV; Var = 0; Scale = 0;
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ExprTy = Constant;
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}
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ExprType(Value *Val); // Create a linear or constant expression
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ExprType(const ConstantInt *scale, Value *var, const ConstantInt *offset);
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/// If this expression has an intrinsic type, return it. If it is zero,
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/// return the specified type.
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///
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const Type *getExprType(const Type *Default) const;
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};
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} // End llvm namespace
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#endif
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