AliasAnalysis.h revision 42c31a70735e55bf82e66a9315c97d1821c9a798
14df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner//===- llvm/Analysis/AliasAnalysis.h - Alias Analysis Interface -*- C++ -*-===// 29769ab22265b313171d201b5928688524a01bd87Misha Brukman// 36fbcc26f1460eaee4e0eb8b426fc1ff0c7af11beJohn Criswell// The LLVM Compiler Infrastructure 46fbcc26f1460eaee4e0eb8b426fc1ff0c7af11beJohn Criswell// 57ed47a13356daed2a34cd2209a31f92552e3bdd8Chris Lattner// This file is distributed under the University of Illinois Open Source 67ed47a13356daed2a34cd2209a31f92552e3bdd8Chris Lattner// License. See LICENSE.TXT for details. 79769ab22265b313171d201b5928688524a01bd87Misha Brukman// 86fbcc26f1460eaee4e0eb8b426fc1ff0c7af11beJohn Criswell//===----------------------------------------------------------------------===// 94df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner// 104df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner// This file defines the generic AliasAnalysis interface, which is used as the 114df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner// common interface used by all clients of alias analysis information, and 121c56b730a6313886076d7b293a126ae5576f5288Chris Lattner// implemented by all alias analysis implementations. Mod/Ref information is 131c56b730a6313886076d7b293a126ae5576f5288Chris Lattner// also captured by this interface. 144df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner// 154df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner// Implementations of this interface must implement the various virtual methods, 164df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner// which automatically provides functionality for the entire suite of client 174df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner// APIs. 184df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner// 191c56b730a6313886076d7b293a126ae5576f5288Chris Lattner// This API represents memory as a (Pointer, Size) pair. The Pointer component 201c56b730a6313886076d7b293a126ae5576f5288Chris Lattner// specifies the base memory address of the region, the Size specifies how large 21e53e3772f3c8b4cba69b7d77c8b2148a080fe9aeDan Gohman// of an area is being queried, or UnknownSize if the size is not known. 22e53e3772f3c8b4cba69b7d77c8b2148a080fe9aeDan Gohman// Pointers that point to two completely different objects in memory never 23e53e3772f3c8b4cba69b7d77c8b2148a080fe9aeDan Gohman// alias, regardless of the value of the Size component. 241c56b730a6313886076d7b293a126ae5576f5288Chris Lattner// 254df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner//===----------------------------------------------------------------------===// 264df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner 274df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner#ifndef LLVM_ANALYSIS_ALIAS_ANALYSIS_H 284df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner#define LLVM_ANALYSIS_ALIAS_ANALYSIS_H 294df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner 301c56b730a6313886076d7b293a126ae5576f5288Chris Lattner#include "llvm/Support/CallSite.h" 3136f78c8935da34074ccd06d5674e45b9cd45da8bChris Lattner#include <vector> 32d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 33d0fde30ce850b78371fd1386338350591f9ff494Brian Gaekenamespace llvm { 34d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 351c56b730a6313886076d7b293a126ae5576f5288Chris Lattnerclass LoadInst; 361c56b730a6313886076d7b293a126ae5576f5288Chris Lattnerclass StoreInst; 3714f1703ae33e13dbcadd701603fd4d7a6f7010b9Andrew Lenharthclass VAArgInst; 381c56b730a6313886076d7b293a126ae5576f5288Chris Lattnerclass TargetData; 396df60a9effe4d20a48cfd9d105c0ab3c5dc3e690Reid Spencerclass Pass; 406df60a9effe4d20a48cfd9d105c0ab3c5dc3e690Reid Spencerclass AnalysisUsage; 411c56b730a6313886076d7b293a126ae5576f5288Chris Lattner 421c56b730a6313886076d7b293a126ae5576f5288Chris Lattnerclass AliasAnalysis { 431c56b730a6313886076d7b293a126ae5576f5288Chris Lattnerprotected: 44ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner const TargetData *TD; 45cb74993bdc37681ddbb80fa361575107afae1350Dan Gohman 46cb74993bdc37681ddbb80fa361575107afae1350Dan Gohmanprivate: 47ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner AliasAnalysis *AA; // Previous Alias Analysis to chain to. 48ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner 49cb74993bdc37681ddbb80fa361575107afae1350Dan Gohmanprotected: 501c56b730a6313886076d7b293a126ae5576f5288Chris Lattner /// InitializeAliasAnalysis - Subclasses must call this method to initialize 511c56b730a6313886076d7b293a126ae5576f5288Chris Lattner /// the AliasAnalysis interface before any other methods are called. This is 521c56b730a6313886076d7b293a126ae5576f5288Chris Lattner /// typically called by the run* methods of these subclasses. This may be 531c56b730a6313886076d7b293a126ae5576f5288Chris Lattner /// called multiple times. 541c56b730a6313886076d7b293a126ae5576f5288Chris Lattner /// 551c56b730a6313886076d7b293a126ae5576f5288Chris Lattner void InitializeAliasAnalysis(Pass *P); 569769ab22265b313171d201b5928688524a01bd87Misha Brukman 5764d237cfae6bcb11157d525c79b5a5335e30370bDan Gohman /// getAnalysisUsage - All alias analysis implementations should invoke this 58fc2a3ed0c9e32cf7edaf5030fa0972b916cc5f0bDan Gohman /// directly (using AliasAnalysis::getAnalysisUsage(AU)). 591c56b730a6313886076d7b293a126ae5576f5288Chris Lattner virtual void getAnalysisUsage(AnalysisUsage &AU) const; 601c56b730a6313886076d7b293a126ae5576f5288Chris Lattner 611c56b730a6313886076d7b293a126ae5576f5288Chris Lattnerpublic: 621997473cf72957d0e70322e2fe6fe2ab141c58a6Devang Patel static char ID; // Class identification, replacement for typeinfo 63ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner AliasAnalysis() : TD(0), AA(0) {} 641c56b730a6313886076d7b293a126ae5576f5288Chris Lattner virtual ~AliasAnalysis(); // We want to be subclassed 651c56b730a6313886076d7b293a126ae5576f5288Chris Lattner 66ef1cfac9e50def9097cd3e3ab3c5cad7f4c758ccDan Gohman /// UnknownSize - This is a special value which can be used with the 67ef1cfac9e50def9097cd3e3ab3c5cad7f4c758ccDan Gohman /// size arguments in alias queries to indicate that the caller does not 68ef1cfac9e50def9097cd3e3ab3c5cad7f4c758ccDan Gohman /// know the sizes of the potential memory references. 693da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman static uint64_t const UnknownSize = ~UINT64_C(0); 70ef1cfac9e50def9097cd3e3ab3c5cad7f4c758ccDan Gohman 71fc2a3ed0c9e32cf7edaf5030fa0972b916cc5f0bDan Gohman /// getTargetData - Return a pointer to the current TargetData object, or 72fc2a3ed0c9e32cf7edaf5030fa0972b916cc5f0bDan Gohman /// null if no TargetData object is available. 73dd298c8c6eb036baf35bf5a559c59d2afd2c7944Misha Brukman /// 74fc2a3ed0c9e32cf7edaf5030fa0972b916cc5f0bDan Gohman const TargetData *getTargetData() const { return TD; } 75fc2a3ed0c9e32cf7edaf5030fa0972b916cc5f0bDan Gohman 76fc2a3ed0c9e32cf7edaf5030fa0972b916cc5f0bDan Gohman /// getTypeStoreSize - Return the TargetData store size for the given type, 77fc2a3ed0c9e32cf7edaf5030fa0972b916cc5f0bDan Gohman /// if known, or a conservative value otherwise. 78fc2a3ed0c9e32cf7edaf5030fa0972b916cc5f0bDan Gohman /// 793da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman uint64_t getTypeStoreSize(const Type *Ty); 804df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner 811c56b730a6313886076d7b293a126ae5576f5288Chris Lattner //===--------------------------------------------------------------------===// 821c56b730a6313886076d7b293a126ae5576f5288Chris Lattner /// Alias Queries... 831c56b730a6313886076d7b293a126ae5576f5288Chris Lattner /// 844df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner 85b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// Location - A description of a memory location. 86b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman struct Location { 87b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// Ptr - The address of the start of the location. 88b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman const Value *Ptr; 896c25c920e66aa2d8f6b48454bc9770087ff7939aDan Gohman /// Size - The maximum size of the location, or UnknownSize if the size is 906c25c920e66aa2d8f6b48454bc9770087ff7939aDan Gohman /// not known. Note that an unknown size does not mean the pointer aliases 916c25c920e66aa2d8f6b48454bc9770087ff7939aDan Gohman /// the entire virtual address space, because there are restrictions on 926c25c920e66aa2d8f6b48454bc9770087ff7939aDan Gohman /// stepping out of one object and into another. 936c25c920e66aa2d8f6b48454bc9770087ff7939aDan Gohman /// See http://llvm.org/docs/LangRef.html#pointeraliasing 943da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman uint64_t Size; 95b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// TBAATag - The metadata node which describes the TBAA type of 966c25c920e66aa2d8f6b48454bc9770087ff7939aDan Gohman /// the location, or null if there is no known unique tag. 97b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman const MDNode *TBAATag; 98b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman 99b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman explicit Location(const Value *P = 0, 1003da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman uint64_t S = UnknownSize, 101b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman const MDNode *N = 0) 102b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman : Ptr(P), Size(S), TBAATag(N) {} 1039f27074f42f03af640977006dc7c05005fb77991Dan Gohman 1049f27074f42f03af640977006dc7c05005fb77991Dan Gohman Location getWithNewPtr(const Value *NewPtr) const { 1059f27074f42f03af640977006dc7c05005fb77991Dan Gohman Location Copy(*this); 1069f27074f42f03af640977006dc7c05005fb77991Dan Gohman Copy.Ptr = NewPtr; 1079f27074f42f03af640977006dc7c05005fb77991Dan Gohman return Copy; 1089f27074f42f03af640977006dc7c05005fb77991Dan Gohman } 1099f27074f42f03af640977006dc7c05005fb77991Dan Gohman 1109f27074f42f03af640977006dc7c05005fb77991Dan Gohman Location getWithoutTBAATag() const { 1119f27074f42f03af640977006dc7c05005fb77991Dan Gohman Location Copy(*this); 1129f27074f42f03af640977006dc7c05005fb77991Dan Gohman Copy.TBAATag = 0; 1139f27074f42f03af640977006dc7c05005fb77991Dan Gohman return Copy; 1149f27074f42f03af640977006dc7c05005fb77991Dan Gohman } 115b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman }; 116b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman 117f12c2c28bd72091f2d7fff5718265c5ad52e7af8Chris Lattner /// Alias analysis result - Either we know for sure that it does not alias, we 118f12c2c28bd72091f2d7fff5718265c5ad52e7af8Chris Lattner /// know for sure it must alias, or we don't know anything: The two pointers 119f12c2c28bd72091f2d7fff5718265c5ad52e7af8Chris Lattner /// _might_ alias. This enum is designed so you can do things like: 120f12c2c28bd72091f2d7fff5718265c5ad52e7af8Chris Lattner /// if (AA.alias(P1, P2)) { ... } 121f12c2c28bd72091f2d7fff5718265c5ad52e7af8Chris Lattner /// to check to see if two pointers might alias. 122f12c2c28bd72091f2d7fff5718265c5ad52e7af8Chris Lattner /// 123e53e3772f3c8b4cba69b7d77c8b2148a080fe9aeDan Gohman /// See docs/AliasAnalysis.html for more information on the specific meanings 124e53e3772f3c8b4cba69b7d77c8b2148a080fe9aeDan Gohman /// of these values. 125e53e3772f3c8b4cba69b7d77c8b2148a080fe9aeDan Gohman /// 1261c56b730a6313886076d7b293a126ae5576f5288Chris Lattner enum AliasResult { NoAlias = 0, MayAlias = 1, MustAlias = 2 }; 1274df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner 128f12c2c28bd72091f2d7fff5718265c5ad52e7af8Chris Lattner /// alias - The main low level interface to the alias analysis implementation. 1296c25c920e66aa2d8f6b48454bc9770087ff7939aDan Gohman /// Returns an AliasResult indicating whether the two pointers are aliased to 1306c25c920e66aa2d8f6b48454bc9770087ff7939aDan Gohman /// each other. This is the interface that must be implemented by specific 1316c25c920e66aa2d8f6b48454bc9770087ff7939aDan Gohman /// alias analysis implementations. 132b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman virtual AliasResult alias(const Location &LocA, const Location &LocB); 1334df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner 134b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// alias - A convenience wrapper. 1353da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman AliasResult alias(const Value *V1, uint64_t V1Size, 1363da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman const Value *V2, uint64_t V2Size) { 137b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman return alias(Location(V1, V1Size), Location(V2, V2Size)); 138b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman } 139b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman 140b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// alias - A convenience wrapper. 141847a84efd23a2c7d90429b82f6e0f19d1f913d9aDan Gohman AliasResult alias(const Value *V1, const Value *V2) { 142ef1cfac9e50def9097cd3e3ab3c5cad7f4c758ccDan Gohman return alias(V1, UnknownSize, V2, UnknownSize); 143847a84efd23a2c7d90429b82f6e0f19d1f913d9aDan Gohman } 144847a84efd23a2c7d90429b82f6e0f19d1f913d9aDan Gohman 145c46530b6a32a53edf0d6d32bcd09ea5d76940472Chris Lattner /// isNoAlias - A trivial helper function to check to see if the specified 146c46530b6a32a53edf0d6d32bcd09ea5d76940472Chris Lattner /// pointers are no-alias. 147b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman bool isNoAlias(const Location &LocA, const Location &LocB) { 148b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman return alias(LocA, LocB) == NoAlias; 149b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman } 150b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman 151b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// isNoAlias - A convenience wrapper. 1523da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman bool isNoAlias(const Value *V1, uint64_t V1Size, 1533da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman const Value *V2, uint64_t V2Size) { 154b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman return isNoAlias(Location(V1, V1Size), Location(V2, V2Size)); 155c46530b6a32a53edf0d6d32bcd09ea5d76940472Chris Lattner } 156c46530b6a32a53edf0d6d32bcd09ea5d76940472Chris Lattner 157a25e5dbcc2371352386a01e3c1b8e76dd890272bDan Gohman /// pointsToConstantMemory - If the specified memory location is 158a25e5dbcc2371352386a01e3c1b8e76dd890272bDan Gohman /// known to be constant, return true. If OrLocal is true and the 159a25e5dbcc2371352386a01e3c1b8e76dd890272bDan Gohman /// specified memory location is known to be "local" (derived from 160a25e5dbcc2371352386a01e3c1b8e76dd890272bDan Gohman /// an alloca), return true. Otherwise return false. 161a25e5dbcc2371352386a01e3c1b8e76dd890272bDan Gohman virtual bool pointsToConstantMemory(const Location &Loc, 162a25e5dbcc2371352386a01e3c1b8e76dd890272bDan Gohman bool OrLocal = false); 163b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman 164b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// pointsToConstantMemory - A convenient wrapper. 165a25e5dbcc2371352386a01e3c1b8e76dd890272bDan Gohman bool pointsToConstantMemory(const Value *P, bool OrLocal = false) { 166a25e5dbcc2371352386a01e3c1b8e76dd890272bDan Gohman return pointsToConstantMemory(Location(P), OrLocal); 167b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman } 16862b5c167de0ca5883a7ad5eb0900eb0c15ad3707Chris Lattner 169248e8ebeff834db9b78917b1531eeee7035eb113Chris Lattner //===--------------------------------------------------------------------===// 170248e8ebeff834db9b78917b1531eeee7035eb113Chris Lattner /// Simple mod/ref information... 171248e8ebeff834db9b78917b1531eeee7035eb113Chris Lattner /// 172248e8ebeff834db9b78917b1531eeee7035eb113Chris Lattner 173248e8ebeff834db9b78917b1531eeee7035eb113Chris Lattner /// ModRefResult - Represent the result of a mod/ref query. Mod and Ref are 174248e8ebeff834db9b78917b1531eeee7035eb113Chris Lattner /// bits which may be or'd together. 175248e8ebeff834db9b78917b1531eeee7035eb113Chris Lattner /// 176248e8ebeff834db9b78917b1531eeee7035eb113Chris Lattner enum ModRefResult { NoModRef = 0, Ref = 1, Mod = 2, ModRef = 3 }; 1779769ab22265b313171d201b5928688524a01bd87Misha Brukman 17842c31a70735e55bf82e66a9315c97d1821c9a798Dan Gohman /// These values define additional bits used to define the 17942c31a70735e55bf82e66a9315c97d1821c9a798Dan Gohman /// ModRefBehavior values. 18042c31a70735e55bf82e66a9315c97d1821c9a798Dan Gohman enum { Nowhere = 0, ArgumentPointees = 4, Anywhere = 8 | ArgumentPointees }; 1819769ab22265b313171d201b5928688524a01bd87Misha Brukman 182248e8ebeff834db9b78917b1531eeee7035eb113Chris Lattner /// ModRefBehavior - Summary of how a function affects memory in the program. 183248e8ebeff834db9b78917b1531eeee7035eb113Chris Lattner /// Loads from constant globals are not considered memory accesses for this 184248e8ebeff834db9b78917b1531eeee7035eb113Chris Lattner /// interface. Also, functions may freely modify stack space local to their 185248e8ebeff834db9b78917b1531eeee7035eb113Chris Lattner /// invocation without having to report it through these interfaces. 186248e8ebeff834db9b78917b1531eeee7035eb113Chris Lattner enum ModRefBehavior { 18750a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// DoesNotAccessMemory - This function does not perform any non-local loads 18850a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// or stores to memory. 18950a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// 19050a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// This property corresponds to the GCC 'const' attribute. 19150a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// This property corresponds to the LLVM IR 'readnone' attribute. 19250a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// This property corresponds to the IntrNoMem LLVM intrinsic flag. 19342c31a70735e55bf82e66a9315c97d1821c9a798Dan Gohman DoesNotAccessMemory = Nowhere | NoModRef, 1949769ab22265b313171d201b5928688524a01bd87Misha Brukman 19550a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// AccessesArgumentsReadonly - This function loads through function 19650a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// arguments and does not perform any non-local stores or volatile 19750a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// loads. 19850a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// 19950a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// This property corresponds to the IntrReadArgMem LLVM intrinsic flag. 20042c31a70735e55bf82e66a9315c97d1821c9a798Dan Gohman AccessesArgumentsReadonly = ArgumentPointees | Ref, 201db78c4873ea8c4b3dce90d761a1ad59d5bcdd6e7Dan Gohman 20250a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// AccessesArguments - This function accesses function arguments in well 20350a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// known (possibly volatile) ways, but does not access any other memory. 20450a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// 20550a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// This property corresponds to the IntrReadWriteArgMem LLVM intrinsic flag. 20642c31a70735e55bf82e66a9315c97d1821c9a798Dan Gohman AccessesArguments = ArgumentPointees | ModRef, 2079769ab22265b313171d201b5928688524a01bd87Misha Brukman 20850a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// OnlyReadsMemory - This function does not perform any non-local stores or 20950a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// volatile loads, but may read from any memory location. 21050a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// 21150a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// This property corresponds to the GCC 'pure' attribute. 21250a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// This property corresponds to the LLVM IR 'readonly' attribute. 21350a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// This property corresponds to the IntrReadMem LLVM intrinsic flag. 21442c31a70735e55bf82e66a9315c97d1821c9a798Dan Gohman OnlyReadsMemory = Anywhere | Ref, 2159769ab22265b313171d201b5928688524a01bd87Misha Brukman 21650a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// UnknownModRefBehavior - This indicates that the function could not be 21750a04d067f8803d52cababdabe5c188844c5c210Dan Gohman /// classified into one of the behaviors above. 21842c31a70735e55bf82e66a9315c97d1821c9a798Dan Gohman UnknownModRefBehavior = Anywhere | ModRef 219248e8ebeff834db9b78917b1531eeee7035eb113Chris Lattner }; 2209769ab22265b313171d201b5928688524a01bd87Misha Brukman 221dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// getModRefBehavior - Return the behavior when calling the given call site. 222a41af344c2964573318a77e2b43eafd4d3804003Dan Gohman virtual ModRefBehavior getModRefBehavior(ImmutableCallSite CS); 223dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands 224dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// getModRefBehavior - Return the behavior when calling the given function. 225dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// For use when the call site is not known. 226a41af344c2964573318a77e2b43eafd4d3804003Dan Gohman virtual ModRefBehavior getModRefBehavior(const Function *F); 227dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands 228dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// doesNotAccessMemory - If the specified call is known to never read or 229dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// write memory, return true. If the call only reads from known-constant 230dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// memory, it is also legal to return true. Calls that unwind the stack 231dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// are legal for this predicate. 2323e295b1b59e47916c8ae5d42eb27a23bd580cabeChris Lattner /// 233dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// Many optimizations (such as CSE and LICM) can be performed on such calls 234dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// without worrying about aliasing properties, and many calls have this 235dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// property (e.g. calls to 'sin' and 'cos'). 2363e295b1b59e47916c8ae5d42eb27a23bd580cabeChris Lattner /// 2373e295b1b59e47916c8ae5d42eb27a23bd580cabeChris Lattner /// This property corresponds to the GCC 'const' attribute. 2383e295b1b59e47916c8ae5d42eb27a23bd580cabeChris Lattner /// 23979fca6fea87be7221843031870bbf2c9ae1fc555Dan Gohman bool doesNotAccessMemory(ImmutableCallSite CS) { 240652f7ea955bb433d6b7a4d33685dca9485fd7b8bEvan Cheng return getModRefBehavior(CS) == DoesNotAccessMemory; 241dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands } 242dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands 243dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// doesNotAccessMemory - If the specified function is known to never read or 244dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// write memory, return true. For use when the call site is not known. 245dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// 24679fca6fea87be7221843031870bbf2c9ae1fc555Dan Gohman bool doesNotAccessMemory(const Function *F) { 247dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands return getModRefBehavior(F) == DoesNotAccessMemory; 248248e8ebeff834db9b78917b1531eeee7035eb113Chris Lattner } 2493e295b1b59e47916c8ae5d42eb27a23bd580cabeChris Lattner 250dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// onlyReadsMemory - If the specified call is known to only read from 251dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// non-volatile memory (or not access memory at all), return true. Calls 252dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// that unwind the stack are legal for this predicate. 2533e295b1b59e47916c8ae5d42eb27a23bd580cabeChris Lattner /// 2543e295b1b59e47916c8ae5d42eb27a23bd580cabeChris Lattner /// This property allows many common optimizations to be performed in the 2553e295b1b59e47916c8ae5d42eb27a23bd580cabeChris Lattner /// absence of interfering store instructions, such as CSE of strlen calls. 2563e295b1b59e47916c8ae5d42eb27a23bd580cabeChris Lattner /// 2573e295b1b59e47916c8ae5d42eb27a23bd580cabeChris Lattner /// This property corresponds to the GCC 'pure' attribute. 2583e295b1b59e47916c8ae5d42eb27a23bd580cabeChris Lattner /// 25979fca6fea87be7221843031870bbf2c9ae1fc555Dan Gohman bool onlyReadsMemory(ImmutableCallSite CS) { 260467a0adfc8b6bd4b114e024c200c159497a4cd86Dan Gohman return onlyReadsMemory(getModRefBehavior(CS)); 261dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands } 262dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands 263dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// onlyReadsMemory - If the specified function is known to only read from 264dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// non-volatile memory (or not access memory at all), return true. For use 265dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// when the call site is not known. 266dff6710717b159f089c76a07eda074eb6347eb92Duncan Sands /// 26779fca6fea87be7221843031870bbf2c9ae1fc555Dan Gohman bool onlyReadsMemory(const Function *F) { 268467a0adfc8b6bd4b114e024c200c159497a4cd86Dan Gohman return onlyReadsMemory(getModRefBehavior(F)); 269467a0adfc8b6bd4b114e024c200c159497a4cd86Dan Gohman } 270467a0adfc8b6bd4b114e024c200c159497a4cd86Dan Gohman 271467a0adfc8b6bd4b114e024c200c159497a4cd86Dan Gohman /// onlyReadsMemory - If the functions with the specified behavior are known 272467a0adfc8b6bd4b114e024c200c159497a4cd86Dan Gohman /// to only read from non-volatile memory (or not access memory at all), return 273467a0adfc8b6bd4b114e024c200c159497a4cd86Dan Gohman /// true. For use when the call site is not known. 274467a0adfc8b6bd4b114e024c200c159497a4cd86Dan Gohman /// 275467a0adfc8b6bd4b114e024c200c159497a4cd86Dan Gohman static bool onlyReadsMemory(ModRefBehavior MRB) { 27642c31a70735e55bf82e66a9315c97d1821c9a798Dan Gohman return !(MRB & Mod); 277248e8ebeff834db9b78917b1531eeee7035eb113Chris Lattner } 2784df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner 2791c56b730a6313886076d7b293a126ae5576f5288Chris Lattner /// getModRefInfo - Return information about whether or not an instruction may 280b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// read or write the specified memory location. An instruction 2811c56b730a6313886076d7b293a126ae5576f5288Chris Lattner /// that doesn't read or write memory may be trivially LICM'd for example. 282fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman ModRefResult getModRefInfo(const Instruction *I, 283b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman const Location &Loc) { 284fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman switch (I->getOpcode()) { 285b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman case Instruction::VAArg: return getModRefInfo((const VAArgInst*)I, Loc); 286b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman case Instruction::Load: return getModRefInfo((const LoadInst*)I, Loc); 287b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman case Instruction::Store: return getModRefInfo((const StoreInst*)I, Loc); 288b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman case Instruction::Call: return getModRefInfo((const CallInst*)I, Loc); 289b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman case Instruction::Invoke: return getModRefInfo((const InvokeInst*)I,Loc); 290fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman default: return NoModRef; 291fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman } 292fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman } 2931c56b730a6313886076d7b293a126ae5576f5288Chris Lattner 294b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// getModRefInfo - A convenience wrapper. 295b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman ModRefResult getModRefInfo(const Instruction *I, 2963da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman const Value *P, uint64_t Size) { 297b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman return getModRefInfo(I, Location(P, Size)); 298b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman } 299b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman 3001c56b730a6313886076d7b293a126ae5576f5288Chris Lattner /// getModRefInfo (for call sites) - Return whether information about whether 301b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// a particular call site modifies or reads the specified memory location. 30279fca6fea87be7221843031870bbf2c9ae1fc555Dan Gohman virtual ModRefResult getModRefInfo(ImmutableCallSite CS, 303b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman const Location &Loc); 304b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman 305b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// getModRefInfo (for call sites) - A convenience wrapper. 306b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman ModRefResult getModRefInfo(ImmutableCallSite CS, 3073da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman const Value *P, uint64_t Size) { 308b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman return getModRefInfo(CS, Location(P, Size)); 309b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman } 3101c56b730a6313886076d7b293a126ae5576f5288Chris Lattner 311fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman /// getModRefInfo (for calls) - Return whether information about whether 312b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// a particular call modifies or reads the specified memory location. 313b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman ModRefResult getModRefInfo(const CallInst *C, const Location &Loc) { 314b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman return getModRefInfo(ImmutableCallSite(C), Loc); 315b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman } 316b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman 317b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// getModRefInfo (for calls) - A convenience wrapper. 3183da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman ModRefResult getModRefInfo(const CallInst *C, const Value *P, uint64_t Size) { 319b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman return getModRefInfo(C, Location(P, Size)); 3201c56b730a6313886076d7b293a126ae5576f5288Chris Lattner } 321fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman 322fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman /// getModRefInfo (for invokes) - Return whether information about whether 323b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// a particular invoke modifies or reads the specified memory location. 324b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman ModRefResult getModRefInfo(const InvokeInst *I, 325b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman const Location &Loc) { 326b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman return getModRefInfo(ImmutableCallSite(I), Loc); 327b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman } 328b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman 329b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// getModRefInfo (for invokes) - A convenience wrapper. 33079fca6fea87be7221843031870bbf2c9ae1fc555Dan Gohman ModRefResult getModRefInfo(const InvokeInst *I, 3313da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman const Value *P, uint64_t Size) { 332b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman return getModRefInfo(I, Location(P, Size)); 3331c56b730a6313886076d7b293a126ae5576f5288Chris Lattner } 334fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman 335fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman /// getModRefInfo (for loads) - Return whether information about whether 336b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// a particular load modifies or reads the specified memory location. 337b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman ModRefResult getModRefInfo(const LoadInst *L, const Location &Loc); 338b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman 339b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// getModRefInfo (for loads) - A convenience wrapper. 3403da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman ModRefResult getModRefInfo(const LoadInst *L, const Value *P, uint64_t Size) { 341b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman return getModRefInfo(L, Location(P, Size)); 342b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman } 343fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman 344fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman /// getModRefInfo (for stores) - Return whether information about whether 345b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// a particular store modifies or reads the specified memory location. 346b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman ModRefResult getModRefInfo(const StoreInst *S, const Location &Loc); 347b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman 348b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// getModRefInfo (for stores) - A convenience wrapper. 3493da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman ModRefResult getModRefInfo(const StoreInst *S, const Value *P, uint64_t Size) { 350b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman return getModRefInfo(S, Location(P, Size)); 351b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman } 352fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman 353fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman /// getModRefInfo (for va_args) - Return whether information about whether 354b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// a particular va_arg modifies or reads the specified memory location. 355b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman ModRefResult getModRefInfo(const VAArgInst* I, const Location &Loc); 356b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman 357b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// getModRefInfo (for va_args) - A convenience wrapper. 3583da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman ModRefResult getModRefInfo(const VAArgInst* I, const Value* P, uint64_t Size) { 359b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman return getModRefInfo(I, Location(P, Size)); 360b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman } 361fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman 362fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman /// getModRefInfo - Return information about whether two call sites may refer 363fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman /// to the same set of memory locations. See 364fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman /// http://llvm.org/docs/AliasAnalysis.html#ModRefInfo 365fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman /// for details. 366fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman virtual ModRefResult getModRefInfo(ImmutableCallSite CS1, 367fa6cb8d8211579f1370e80b7bac54ebe3fbe35c8Dan Gohman ImmutableCallSite CS2); 3684df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner 369ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner //===--------------------------------------------------------------------===// 370ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// Higher level methods for querying mod/ref information. 371ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// 372ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner 373f12c2c28bd72091f2d7fff5718265c5ad52e7af8Chris Lattner /// canBasicBlockModify - Return true if it is possible for execution of the 374f12c2c28bd72091f2d7fff5718265c5ad52e7af8Chris Lattner /// specified basic block to modify the value pointed to by Ptr. 375b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman bool canBasicBlockModify(const BasicBlock &BB, const Location &Loc); 376b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman 377b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// canBasicBlockModify - A convenience wrapper. 3783da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman bool canBasicBlockModify(const BasicBlock &BB, const Value *P, uint64_t Size){ 379b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman return canBasicBlockModify(BB, Location(P, Size)); 380b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman } 3814df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner 382f12c2c28bd72091f2d7fff5718265c5ad52e7af8Chris Lattner /// canInstructionRangeModify - Return true if it is possible for the 383f12c2c28bd72091f2d7fff5718265c5ad52e7af8Chris Lattner /// execution of the specified instructions to modify the value pointed to by 384f12c2c28bd72091f2d7fff5718265c5ad52e7af8Chris Lattner /// Ptr. The instructions to consider are all of the instructions in the 385f12c2c28bd72091f2d7fff5718265c5ad52e7af8Chris Lattner /// range of [I1,I2] INCLUSIVE. I1 and I2 must be in the same basic block. 3864df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner bool canInstructionRangeModify(const Instruction &I1, const Instruction &I2, 387b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman const Location &Loc); 388b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman 389b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman /// canInstructionRangeModify - A convenience wrapper. 390b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman bool canInstructionRangeModify(const Instruction &I1, const Instruction &I2, 3913da848bbda62b25c12335998aaa44ab361f0bf15Dan Gohman const Value *Ptr, uint64_t Size) { 392b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman return canInstructionRangeModify(I1, I2, Location(Ptr, Size)); 393b2143b6247901ae4eca2192ee134564c4f5f7853Dan Gohman } 394ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner 395ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner //===--------------------------------------------------------------------===// 396ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// Methods that clients should call when they transform the program to allow 397ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// alias analyses to update their internal data structures. Note that these 398ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// methods may be called on any instruction, regardless of whether or not 399ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// they have pointer-analysis implications. 400ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// 401ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner 402ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// deleteValue - This method should be called whenever an LLVM Value is 403ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// deleted from the program, for example when an instruction is found to be 404ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// redundant and is eliminated. 405ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// 406ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner virtual void deleteValue(Value *V); 407ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner 408ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// copyValue - This method should be used whenever a preexisting value in the 409ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// program is copied or cloned, introducing a new value. Note that analysis 410ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// implementations should tolerate clients that use this method to introduce 411ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// the same value multiple times: if the analysis already knows about a 412ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// value, it should ignore the request. 413ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// 414ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner virtual void copyValue(Value *From, Value *To); 415ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner 416ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// replaceWithNewValue - This method is the obvious combination of the two 417ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// above, and it provided as a helper to simplify client code. 418ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner /// 419ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner void replaceWithNewValue(Value *Old, Value *New) { 420ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner copyValue(Old, New); 421ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner deleteValue(Old); 422ab8c565768ff7485f40cbb65e2914f9046e743d4Chris Lattner } 4234df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner}; 4244df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner 425a5f81bba4ab18d6129774d4d67495f14b6f64375Dan Gohman/// isNoAliasCall - Return true if this pointer is returned by a noalias 426a5f81bba4ab18d6129774d4d67495f14b6f64375Dan Gohman/// function. 427a5f81bba4ab18d6129774d4d67495f14b6f64375Dan Gohmanbool isNoAliasCall(const Value *V); 428a5f81bba4ab18d6129774d4d67495f14b6f64375Dan Gohman 4293311a1f8f0d8a2c6d940802bbb95eba0b801a615Dan Gohman/// isIdentifiedObject - Return true if this pointer refers to a distinct and 430a5f81bba4ab18d6129774d4d67495f14b6f64375Dan Gohman/// identifiable object. This returns true for: 4315753a4a0033da4add45f2e9930a4e1159d92a869Dan Gohman/// Global Variables and Functions (but not Global Aliases) 432a5f81bba4ab18d6129774d4d67495f14b6f64375Dan Gohman/// Allocas and Mallocs 4339e86f4364b912ae743490ba01d6989acfd12c046Dan Gohman/// ByVal and NoAlias Arguments 4349e86f4364b912ae743490ba01d6989acfd12c046Dan Gohman/// NoAlias returns 4353311a1f8f0d8a2c6d940802bbb95eba0b801a615Dan Gohman/// 4369e86f4364b912ae743490ba01d6989acfd12c046Dan Gohmanbool isIdentifiedObject(const Value *V); 4373311a1f8f0d8a2c6d940802bbb95eba0b801a615Dan Gohman 4384f1bd9e9963239c119db70070db1d68286b3de7eReid Spencer} // End llvm namespace 4394f1bd9e9963239c119db70070db1d68286b3de7eReid Spencer 4404df22c0100fe27f19e6f4874f24eedd0742b9cf4Chris Lattner#endif 441