Chris Lattner | cf3056d | 2003-10-13 03:32:08 +0000 | [diff] [blame] | 1 | //===-- Instruction.cpp - Implement the Instruction class -----------------===// |
Misha Brukman | fd93908 | 2005-04-21 23:48:37 +0000 | [diff] [blame] | 2 | // |
John Criswell | b576c94 | 2003-10-20 19:43:21 +0000 | [diff] [blame] | 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
Chris Lattner | 4ee451d | 2007-12-29 20:36:04 +0000 | [diff] [blame] | 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
Misha Brukman | fd93908 | 2005-04-21 23:48:37 +0000 | [diff] [blame] | 7 | // |
John Criswell | b576c94 | 2003-10-20 19:43:21 +0000 | [diff] [blame] | 8 | //===----------------------------------------------------------------------===// |
Chris Lattner | 0095054 | 2001-06-06 20:29:01 +0000 | [diff] [blame] | 9 | // |
| 10 | // This file implements the Instruction class for the VMCore library. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
Reid Spencer | 45fb3f3 | 2006-11-20 01:22:35 +0000 | [diff] [blame] | 14 | #include "llvm/Type.h" |
Chris Lattner | 38f1455 | 2004-11-30 02:51:53 +0000 | [diff] [blame] | 15 | #include "llvm/Instructions.h" |
Chris Lattner | 2fbfdcf | 2002-04-07 20:49:59 +0000 | [diff] [blame] | 16 | #include "llvm/Function.h" |
Duncan Sands | a3355ff | 2007-12-03 20:06:50 +0000 | [diff] [blame] | 17 | #include "llvm/Support/CallSite.h" |
Reid Spencer | 551ccae | 2004-09-01 22:55:40 +0000 | [diff] [blame] | 18 | #include "llvm/Support/LeakDetector.h" |
Chris Lattner | 4b74c83 | 2003-11-20 17:45:12 +0000 | [diff] [blame] | 19 | using namespace llvm; |
Brian Gaeke | d0fde30 | 2003-11-11 22:41:34 +0000 | [diff] [blame] | 20 | |
Chris Lattner | 96d83f6 | 2005-01-29 00:35:33 +0000 | [diff] [blame] | 21 | Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps, |
Chris Lattner | 910c80a | 2007-02-24 00:55:48 +0000 | [diff] [blame] | 22 | Instruction *InsertBefore) |
Chris Lattner | dec628e | 2007-02-12 05:18:08 +0000 | [diff] [blame] | 23 | : User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(0) { |
Chris Lattner | d1e693f | 2002-09-08 18:59:35 +0000 | [diff] [blame] | 24 | // Make sure that we get added to a basicblock |
| 25 | LeakDetector::addGarbageObject(this); |
Chris Lattner | 2aa8311 | 2002-09-10 15:45:53 +0000 | [diff] [blame] | 26 | |
| 27 | // If requested, insert this instruction into a basic block... |
| 28 | if (InsertBefore) { |
| 29 | assert(InsertBefore->getParent() && |
| 30 | "Instruction to insert before is not in a basic block!"); |
| 31 | InsertBefore->getParent()->getInstList().insert(InsertBefore, this); |
| 32 | } |
Chris Lattner | 0095054 | 2001-06-06 20:29:01 +0000 | [diff] [blame] | 33 | } |
| 34 | |
Chris Lattner | 96d83f6 | 2005-01-29 00:35:33 +0000 | [diff] [blame] | 35 | Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps, |
Chris Lattner | 910c80a | 2007-02-24 00:55:48 +0000 | [diff] [blame] | 36 | BasicBlock *InsertAtEnd) |
Chris Lattner | dec628e | 2007-02-12 05:18:08 +0000 | [diff] [blame] | 37 | : User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(0) { |
Chris Lattner | 96d83f6 | 2005-01-29 00:35:33 +0000 | [diff] [blame] | 38 | // Make sure that we get added to a basicblock |
| 39 | LeakDetector::addGarbageObject(this); |
Alkis Evlogimenos | e5828f1 | 2004-05-26 21:41:09 +0000 | [diff] [blame] | 40 | |
| 41 | // append this instruction into the basic block |
| 42 | assert(InsertAtEnd && "Basic block to append to may not be NULL!"); |
| 43 | InsertAtEnd->getInstList().push_back(this); |
Chris Lattner | f00042a | 2007-02-13 07:54:42 +0000 | [diff] [blame] | 44 | } |
| 45 | |
| 46 | |
Chris Lattner | 70aa33e | 2006-06-21 16:53:47 +0000 | [diff] [blame] | 47 | // Out of line virtual method, so the vtable, etc has a home. |
Gordon Henriksen | afba8fe | 2007-12-10 02:14:30 +0000 | [diff] [blame] | 48 | Instruction::~Instruction() { |
| 49 | assert(Parent == 0 && "Instruction still linked in the program!"); |
Chris Lattner | 70aa33e | 2006-06-21 16:53:47 +0000 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | |
Chris Lattner | bded132 | 2002-09-06 21:33:15 +0000 | [diff] [blame] | 53 | void Instruction::setParent(BasicBlock *P) { |
Chris Lattner | 786993c | 2004-02-04 01:06:38 +0000 | [diff] [blame] | 54 | if (getParent()) { |
| 55 | if (!P) LeakDetector::addGarbageObject(this); |
| 56 | } else { |
| 57 | if (P) LeakDetector::removeGarbageObject(this); |
| 58 | } |
Chris Lattner | d1e693f | 2002-09-08 18:59:35 +0000 | [diff] [blame] | 59 | |
Chris Lattner | bded132 | 2002-09-06 21:33:15 +0000 | [diff] [blame] | 60 | Parent = P; |
| 61 | } |
| 62 | |
Chris Lattner | 4b83380 | 2004-10-11 22:21:39 +0000 | [diff] [blame] | 63 | void Instruction::removeFromParent() { |
| 64 | getParent()->getInstList().remove(this); |
| 65 | } |
| 66 | |
| 67 | void Instruction::eraseFromParent() { |
| 68 | getParent()->getInstList().erase(this); |
| 69 | } |
Vikram S. Adve | c105645 | 2002-07-14 23:09:40 +0000 | [diff] [blame] | 70 | |
Owen Anderson | 26bb50a | 2008-06-17 18:29:27 +0000 | [diff] [blame] | 71 | /// insertBefore - Insert an unlinked instructions into a basic block |
| 72 | /// immediately before the specified instruction. |
| 73 | void Instruction::insertBefore(Instruction *InsertPos) { |
| 74 | InsertPos->getParent()->getInstList().insert(InsertPos, this); |
| 75 | } |
| 76 | |
Chris Lattner | 3ff704f | 2009-01-13 07:43:51 +0000 | [diff] [blame] | 77 | /// insertAfter - Insert an unlinked instructions into a basic block |
| 78 | /// immediately after the specified instruction. |
| 79 | void Instruction::insertAfter(Instruction *InsertPos) { |
| 80 | InsertPos->getParent()->getInstList().insertAfter(InsertPos, this); |
| 81 | } |
| 82 | |
Chris Lattner | 0fe34d8 | 2005-08-08 05:21:50 +0000 | [diff] [blame] | 83 | /// moveBefore - Unlink this instruction from its current basic block and |
| 84 | /// insert it into the basic block that MovePos lives in, right before |
| 85 | /// MovePos. |
| 86 | void Instruction::moveBefore(Instruction *MovePos) { |
| 87 | MovePos->getParent()->getInstList().splice(MovePos,getParent()->getInstList(), |
| 88 | this); |
| 89 | } |
| 90 | |
| 91 | |
Vikram S. Adve | c105645 | 2002-07-14 23:09:40 +0000 | [diff] [blame] | 92 | const char *Instruction::getOpcodeName(unsigned OpCode) { |
| 93 | switch (OpCode) { |
| 94 | // Terminators |
Chris Lattner | 0513e9f | 2002-08-14 18:18:02 +0000 | [diff] [blame] | 95 | case Ret: return "ret"; |
| 96 | case Br: return "br"; |
Vikram S. Adve | c105645 | 2002-07-14 23:09:40 +0000 | [diff] [blame] | 97 | case Switch: return "switch"; |
| 98 | case Invoke: return "invoke"; |
Chris Lattner | a6ce898 | 2003-09-08 18:54:36 +0000 | [diff] [blame] | 99 | case Unwind: return "unwind"; |
Chris Lattner | b976e66 | 2004-10-16 18:08:06 +0000 | [diff] [blame] | 100 | case Unreachable: return "unreachable"; |
Misha Brukman | fd93908 | 2005-04-21 23:48:37 +0000 | [diff] [blame] | 101 | |
Vikram S. Adve | c105645 | 2002-07-14 23:09:40 +0000 | [diff] [blame] | 102 | // Standard binary operators... |
| 103 | case Add: return "add"; |
Dan Gohman | ae3a0be | 2009-06-04 22:49:04 +0000 | [diff] [blame] | 104 | case FAdd: return "fadd"; |
Vikram S. Adve | c105645 | 2002-07-14 23:09:40 +0000 | [diff] [blame] | 105 | case Sub: return "sub"; |
Dan Gohman | ae3a0be | 2009-06-04 22:49:04 +0000 | [diff] [blame] | 106 | case FSub: return "fsub"; |
Vikram S. Adve | c105645 | 2002-07-14 23:09:40 +0000 | [diff] [blame] | 107 | case Mul: return "mul"; |
Dan Gohman | ae3a0be | 2009-06-04 22:49:04 +0000 | [diff] [blame] | 108 | case FMul: return "fmul"; |
Reid Spencer | 1628cec | 2006-10-26 06:15:43 +0000 | [diff] [blame] | 109 | case UDiv: return "udiv"; |
| 110 | case SDiv: return "sdiv"; |
| 111 | case FDiv: return "fdiv"; |
Reid Spencer | 0a783f7 | 2006-11-02 01:53:59 +0000 | [diff] [blame] | 112 | case URem: return "urem"; |
| 113 | case SRem: return "srem"; |
| 114 | case FRem: return "frem"; |
Vikram S. Adve | c105645 | 2002-07-14 23:09:40 +0000 | [diff] [blame] | 115 | |
| 116 | // Logical operators... |
| 117 | case And: return "and"; |
| 118 | case Or : return "or"; |
| 119 | case Xor: return "xor"; |
| 120 | |
Vikram S. Adve | c105645 | 2002-07-14 23:09:40 +0000 | [diff] [blame] | 121 | // Memory instructions... |
| 122 | case Malloc: return "malloc"; |
| 123 | case Free: return "free"; |
| 124 | case Alloca: return "alloca"; |
| 125 | case Load: return "load"; |
| 126 | case Store: return "store"; |
| 127 | case GetElementPtr: return "getelementptr"; |
Misha Brukman | fd93908 | 2005-04-21 23:48:37 +0000 | [diff] [blame] | 128 | |
Reid Spencer | 3da59db | 2006-11-27 01:05:10 +0000 | [diff] [blame] | 129 | // Convert instructions... |
| 130 | case Trunc: return "trunc"; |
| 131 | case ZExt: return "zext"; |
| 132 | case SExt: return "sext"; |
| 133 | case FPTrunc: return "fptrunc"; |
| 134 | case FPExt: return "fpext"; |
| 135 | case FPToUI: return "fptoui"; |
| 136 | case FPToSI: return "fptosi"; |
| 137 | case UIToFP: return "uitofp"; |
| 138 | case SIToFP: return "sitofp"; |
| 139 | case IntToPtr: return "inttoptr"; |
| 140 | case PtrToInt: return "ptrtoint"; |
| 141 | case BitCast: return "bitcast"; |
| 142 | |
Vikram S. Adve | c105645 | 2002-07-14 23:09:40 +0000 | [diff] [blame] | 143 | // Other instructions... |
Reid Spencer | 74f1642 | 2006-12-03 06:27:29 +0000 | [diff] [blame] | 144 | case ICmp: return "icmp"; |
| 145 | case FCmp: return "fcmp"; |
Nate Begeman | ac80ade | 2008-05-12 19:01:56 +0000 | [diff] [blame] | 146 | case VICmp: return "vicmp"; |
| 147 | case VFCmp: return "vfcmp"; |
Reid Spencer | 3da59db | 2006-11-27 01:05:10 +0000 | [diff] [blame] | 148 | case PHI: return "phi"; |
| 149 | case Select: return "select"; |
| 150 | case Call: return "call"; |
| 151 | case Shl: return "shl"; |
| 152 | case LShr: return "lshr"; |
| 153 | case AShr: return "ashr"; |
| 154 | case VAArg: return "va_arg"; |
Robert Bocchino | b52ee7f | 2006-01-10 19:05:34 +0000 | [diff] [blame] | 155 | case ExtractElement: return "extractelement"; |
Reid Spencer | 3da59db | 2006-11-27 01:05:10 +0000 | [diff] [blame] | 156 | case InsertElement: return "insertelement"; |
| 157 | case ShuffleVector: return "shufflevector"; |
Matthijs Kooijman | 74b5e07 | 2008-05-30 10:31:54 +0000 | [diff] [blame] | 158 | case ExtractValue: return "extractvalue"; |
| 159 | case InsertValue: return "insertvalue"; |
Chris Lattner | 8f77dae | 2003-05-08 02:44:12 +0000 | [diff] [blame] | 160 | |
Vikram S. Adve | c105645 | 2002-07-14 23:09:40 +0000 | [diff] [blame] | 161 | default: return "<Invalid operator> "; |
| 162 | } |
Misha Brukman | fd93908 | 2005-04-21 23:48:37 +0000 | [diff] [blame] | 163 | |
Vikram S. Adve | c105645 | 2002-07-14 23:09:40 +0000 | [diff] [blame] | 164 | return 0; |
| 165 | } |
Chris Lattner | f2da724 | 2002-10-31 04:14:01 +0000 | [diff] [blame] | 166 | |
Chris Lattner | 38f1455 | 2004-11-30 02:51:53 +0000 | [diff] [blame] | 167 | /// isIdenticalTo - Return true if the specified instruction is exactly |
| 168 | /// identical to the current one. This means that all operands match and any |
| 169 | /// extra information (e.g. load is volatile) agree. |
Chris Lattner | e3a0884 | 2008-11-27 08:39:18 +0000 | [diff] [blame] | 170 | bool Instruction::isIdenticalTo(const Instruction *I) const { |
Chris Lattner | 38f1455 | 2004-11-30 02:51:53 +0000 | [diff] [blame] | 171 | if (getOpcode() != I->getOpcode() || |
| 172 | getNumOperands() != I->getNumOperands() || |
| 173 | getType() != I->getType()) |
| 174 | return false; |
| 175 | |
| 176 | // We have two instructions of identical opcode and #operands. Check to see |
| 177 | // if all operands are the same. |
| 178 | for (unsigned i = 0, e = getNumOperands(); i != e; ++i) |
| 179 | if (getOperand(i) != I->getOperand(i)) |
| 180 | return false; |
| 181 | |
| 182 | // Check special state that is a part of some instructions. |
| 183 | if (const LoadInst *LI = dyn_cast<LoadInst>(this)) |
Dan Gohman | 9a8af45 | 2008-10-16 01:24:45 +0000 | [diff] [blame] | 184 | return LI->isVolatile() == cast<LoadInst>(I)->isVolatile() && |
| 185 | LI->getAlignment() == cast<LoadInst>(I)->getAlignment(); |
Chris Lattner | 38f1455 | 2004-11-30 02:51:53 +0000 | [diff] [blame] | 186 | if (const StoreInst *SI = dyn_cast<StoreInst>(this)) |
Dan Gohman | 9a8af45 | 2008-10-16 01:24:45 +0000 | [diff] [blame] | 187 | return SI->isVolatile() == cast<StoreInst>(I)->isVolatile() && |
| 188 | SI->getAlignment() == cast<StoreInst>(I)->getAlignment(); |
Reid Spencer | e4d87aa | 2006-12-23 06:05:41 +0000 | [diff] [blame] | 189 | if (const CmpInst *CI = dyn_cast<CmpInst>(this)) |
| 190 | return CI->getPredicate() == cast<CmpInst>(I)->getPredicate(); |
Chris Lattner | ddb6db4 | 2005-05-06 05:51:46 +0000 | [diff] [blame] | 191 | if (const CallInst *CI = dyn_cast<CallInst>(this)) |
Dan Gohman | 9a8af45 | 2008-10-16 01:24:45 +0000 | [diff] [blame] | 192 | return CI->isTailCall() == cast<CallInst>(I)->isTailCall() && |
| 193 | CI->getCallingConv() == cast<CallInst>(I)->getCallingConv() && |
| 194 | CI->getAttributes().getRawPointer() == |
| 195 | cast<CallInst>(I)->getAttributes().getRawPointer(); |
| 196 | if (const InvokeInst *CI = dyn_cast<InvokeInst>(this)) |
Nick Lewycky | 41fe88b | 2008-10-27 07:28:44 +0000 | [diff] [blame] | 197 | return CI->getCallingConv() == cast<InvokeInst>(I)->getCallingConv() && |
Dan Gohman | 9a8af45 | 2008-10-16 01:24:45 +0000 | [diff] [blame] | 198 | CI->getAttributes().getRawPointer() == |
Nick Lewycky | 41fe88b | 2008-10-27 07:28:44 +0000 | [diff] [blame] | 199 | cast<InvokeInst>(I)->getAttributes().getRawPointer(); |
Dan Gohman | 9a8af45 | 2008-10-16 01:24:45 +0000 | [diff] [blame] | 200 | if (const InsertValueInst *IVI = dyn_cast<InsertValueInst>(this)) { |
| 201 | if (IVI->getNumIndices() != cast<InsertValueInst>(I)->getNumIndices()) |
| 202 | return false; |
| 203 | for (unsigned i = 0, e = IVI->getNumIndices(); i != e; ++i) |
| 204 | if (IVI->idx_begin()[i] != cast<InsertValueInst>(I)->idx_begin()[i]) |
| 205 | return false; |
| 206 | return true; |
| 207 | } |
| 208 | if (const ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(this)) { |
| 209 | if (EVI->getNumIndices() != cast<ExtractValueInst>(I)->getNumIndices()) |
| 210 | return false; |
| 211 | for (unsigned i = 0, e = EVI->getNumIndices(); i != e; ++i) |
| 212 | if (EVI->idx_begin()[i] != cast<ExtractValueInst>(I)->idx_begin()[i]) |
| 213 | return false; |
| 214 | return true; |
| 215 | } |
| 216 | |
Chris Lattner | 38f1455 | 2004-11-30 02:51:53 +0000 | [diff] [blame] | 217 | return true; |
| 218 | } |
| 219 | |
Reid Spencer | e4d87aa | 2006-12-23 06:05:41 +0000 | [diff] [blame] | 220 | // isSameOperationAs |
Chris Lattner | e3a0884 | 2008-11-27 08:39:18 +0000 | [diff] [blame] | 221 | bool Instruction::isSameOperationAs(const Instruction *I) const { |
Reid Spencer | e4d87aa | 2006-12-23 06:05:41 +0000 | [diff] [blame] | 222 | if (getOpcode() != I->getOpcode() || getType() != I->getType() || |
| 223 | getNumOperands() != I->getNumOperands()) |
| 224 | return false; |
| 225 | |
| 226 | // We have two instructions of identical opcode and #operands. Check to see |
| 227 | // if all operands are the same type |
| 228 | for (unsigned i = 0, e = getNumOperands(); i != e; ++i) |
| 229 | if (getOperand(i)->getType() != I->getOperand(i)->getType()) |
| 230 | return false; |
| 231 | |
| 232 | // Check special state that is a part of some instructions. |
| 233 | if (const LoadInst *LI = dyn_cast<LoadInst>(this)) |
Dan Gohman | 9a8af45 | 2008-10-16 01:24:45 +0000 | [diff] [blame] | 234 | return LI->isVolatile() == cast<LoadInst>(I)->isVolatile() && |
| 235 | LI->getAlignment() == cast<LoadInst>(I)->getAlignment(); |
Reid Spencer | e4d87aa | 2006-12-23 06:05:41 +0000 | [diff] [blame] | 236 | if (const StoreInst *SI = dyn_cast<StoreInst>(this)) |
Dan Gohman | 9a8af45 | 2008-10-16 01:24:45 +0000 | [diff] [blame] | 237 | return SI->isVolatile() == cast<StoreInst>(I)->isVolatile() && |
| 238 | SI->getAlignment() == cast<StoreInst>(I)->getAlignment(); |
Reid Spencer | e4d87aa | 2006-12-23 06:05:41 +0000 | [diff] [blame] | 239 | if (const CmpInst *CI = dyn_cast<CmpInst>(this)) |
| 240 | return CI->getPredicate() == cast<CmpInst>(I)->getPredicate(); |
| 241 | if (const CallInst *CI = dyn_cast<CallInst>(this)) |
Dan Gohman | 9a8af45 | 2008-10-16 01:24:45 +0000 | [diff] [blame] | 242 | return CI->isTailCall() == cast<CallInst>(I)->isTailCall() && |
| 243 | CI->getCallingConv() == cast<CallInst>(I)->getCallingConv() && |
| 244 | CI->getAttributes().getRawPointer() == |
| 245 | cast<CallInst>(I)->getAttributes().getRawPointer(); |
| 246 | if (const InvokeInst *CI = dyn_cast<InvokeInst>(this)) |
Nick Lewycky | 41fe88b | 2008-10-27 07:28:44 +0000 | [diff] [blame] | 247 | return CI->getCallingConv() == cast<InvokeInst>(I)->getCallingConv() && |
Dan Gohman | 9a8af45 | 2008-10-16 01:24:45 +0000 | [diff] [blame] | 248 | CI->getAttributes().getRawPointer() == |
Nick Lewycky | 41fe88b | 2008-10-27 07:28:44 +0000 | [diff] [blame] | 249 | cast<InvokeInst>(I)->getAttributes().getRawPointer(); |
Dan Gohman | 9a8af45 | 2008-10-16 01:24:45 +0000 | [diff] [blame] | 250 | if (const InsertValueInst *IVI = dyn_cast<InsertValueInst>(this)) { |
| 251 | if (IVI->getNumIndices() != cast<InsertValueInst>(I)->getNumIndices()) |
| 252 | return false; |
| 253 | for (unsigned i = 0, e = IVI->getNumIndices(); i != e; ++i) |
| 254 | if (IVI->idx_begin()[i] != cast<InsertValueInst>(I)->idx_begin()[i]) |
| 255 | return false; |
| 256 | return true; |
| 257 | } |
| 258 | if (const ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(this)) { |
| 259 | if (EVI->getNumIndices() != cast<ExtractValueInst>(I)->getNumIndices()) |
| 260 | return false; |
| 261 | for (unsigned i = 0, e = EVI->getNumIndices(); i != e; ++i) |
| 262 | if (EVI->idx_begin()[i] != cast<ExtractValueInst>(I)->idx_begin()[i]) |
| 263 | return false; |
| 264 | return true; |
| 265 | } |
Reid Spencer | e4d87aa | 2006-12-23 06:05:41 +0000 | [diff] [blame] | 266 | |
| 267 | return true; |
| 268 | } |
| 269 | |
Chris Lattner | 7ae40e7 | 2008-04-20 22:11:30 +0000 | [diff] [blame] | 270 | /// isUsedOutsideOfBlock - Return true if there are any uses of I outside of the |
| 271 | /// specified block. Note that PHI nodes are considered to evaluate their |
| 272 | /// operands in the corresponding predecessor block. |
| 273 | bool Instruction::isUsedOutsideOfBlock(const BasicBlock *BB) const { |
| 274 | for (use_const_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) { |
| 275 | // PHI nodes uses values in the corresponding predecessor block. For other |
| 276 | // instructions, just check to see whether the parent of the use matches up. |
| 277 | const PHINode *PN = dyn_cast<PHINode>(*UI); |
| 278 | if (PN == 0) { |
| 279 | if (cast<Instruction>(*UI)->getParent() != BB) |
| 280 | return true; |
| 281 | continue; |
| 282 | } |
| 283 | |
Gabor Greif | a36791d | 2009-01-23 19:40:15 +0000 | [diff] [blame] | 284 | if (PN->getIncomingBlock(UI) != BB) |
Chris Lattner | 7ae40e7 | 2008-04-20 22:11:30 +0000 | [diff] [blame] | 285 | return true; |
| 286 | } |
| 287 | return false; |
| 288 | } |
| 289 | |
Chris Lattner | d96288a | 2008-05-08 17:16:51 +0000 | [diff] [blame] | 290 | /// mayReadFromMemory - Return true if this instruction may read memory. |
| 291 | /// |
| 292 | bool Instruction::mayReadFromMemory() const { |
| 293 | switch (getOpcode()) { |
| 294 | default: return false; |
| 295 | case Instruction::Free: |
Chris Lattner | d96288a | 2008-05-08 17:16:51 +0000 | [diff] [blame] | 296 | case Instruction::VAArg: |
Chris Lattner | 748118d | 2008-05-08 21:58:49 +0000 | [diff] [blame] | 297 | case Instruction::Load: |
Chris Lattner | d96288a | 2008-05-08 17:16:51 +0000 | [diff] [blame] | 298 | return true; |
| 299 | case Instruction::Call: |
| 300 | return !cast<CallInst>(this)->doesNotAccessMemory(); |
| 301 | case Instruction::Invoke: |
| 302 | return !cast<InvokeInst>(this)->doesNotAccessMemory(); |
Chris Lattner | 748118d | 2008-05-08 21:58:49 +0000 | [diff] [blame] | 303 | case Instruction::Store: |
| 304 | return cast<StoreInst>(this)->isVolatile(); |
Chris Lattner | d96288a | 2008-05-08 17:16:51 +0000 | [diff] [blame] | 305 | } |
| 306 | } |
Chris Lattner | 7ae40e7 | 2008-04-20 22:11:30 +0000 | [diff] [blame] | 307 | |
Chris Lattner | bb5493d | 2007-02-15 23:15:00 +0000 | [diff] [blame] | 308 | /// mayWriteToMemory - Return true if this instruction may modify memory. |
| 309 | /// |
| 310 | bool Instruction::mayWriteToMemory() const { |
| 311 | switch (getOpcode()) { |
| 312 | default: return false; |
| 313 | case Instruction::Free: |
Duncan Sands | a3355ff | 2007-12-03 20:06:50 +0000 | [diff] [blame] | 314 | case Instruction::Store: |
Chris Lattner | bb5493d | 2007-02-15 23:15:00 +0000 | [diff] [blame] | 315 | case Instruction::VAArg: |
| 316 | return true; |
| 317 | case Instruction::Call: |
Duncan Sands | a3355ff | 2007-12-03 20:06:50 +0000 | [diff] [blame] | 318 | return !cast<CallInst>(this)->onlyReadsMemory(); |
Chris Lattner | d96288a | 2008-05-08 17:16:51 +0000 | [diff] [blame] | 319 | case Instruction::Invoke: |
| 320 | return !cast<InvokeInst>(this)->onlyReadsMemory(); |
Chris Lattner | bb5493d | 2007-02-15 23:15:00 +0000 | [diff] [blame] | 321 | case Instruction::Load: |
| 322 | return cast<LoadInst>(this)->isVolatile(); |
| 323 | } |
| 324 | } |
Chris Lattner | f2da724 | 2002-10-31 04:14:01 +0000 | [diff] [blame] | 325 | |
Duncan Sands | 7af1c78 | 2009-05-06 06:49:50 +0000 | [diff] [blame] | 326 | /// mayThrow - Return true if this instruction may throw an exception. |
| 327 | /// |
| 328 | bool Instruction::mayThrow() const { |
| 329 | if (const CallInst *CI = dyn_cast<CallInst>(this)) |
| 330 | return !CI->doesNotThrow(); |
| 331 | return false; |
| 332 | } |
| 333 | |
Chris Lattner | f2da724 | 2002-10-31 04:14:01 +0000 | [diff] [blame] | 334 | /// isAssociative - Return true if the instruction is associative: |
| 335 | /// |
Dan Gohman | ae3a0be | 2009-06-04 22:49:04 +0000 | [diff] [blame] | 336 | /// Associative operators satisfy: x op (y op z) === (x op y) op z |
Chris Lattner | f2da724 | 2002-10-31 04:14:01 +0000 | [diff] [blame] | 337 | /// |
Dan Gohman | ae3a0be | 2009-06-04 22:49:04 +0000 | [diff] [blame] | 338 | /// In LLVM, the Add, Mul, And, Or, and Xor operators are associative. |
Chris Lattner | f2da724 | 2002-10-31 04:14:01 +0000 | [diff] [blame] | 339 | /// |
| 340 | bool Instruction::isAssociative(unsigned Opcode, const Type *Ty) { |
Dan Gohman | ae3a0be | 2009-06-04 22:49:04 +0000 | [diff] [blame] | 341 | return Opcode == And || Opcode == Or || Opcode == Xor || |
| 342 | Opcode == Add || Opcode == Mul; |
Chris Lattner | f2da724 | 2002-10-31 04:14:01 +0000 | [diff] [blame] | 343 | } |
| 344 | |
| 345 | /// isCommutative - Return true if the instruction is commutative: |
| 346 | /// |
Misha Brukman | 6b63452 | 2003-10-10 17:54:14 +0000 | [diff] [blame] | 347 | /// Commutative operators satisfy: (x op y) === (y op x) |
Chris Lattner | f2da724 | 2002-10-31 04:14:01 +0000 | [diff] [blame] | 348 | /// |
| 349 | /// In LLVM, these are the associative operators, plus SetEQ and SetNE, when |
| 350 | /// applied to any type. |
| 351 | /// |
| 352 | bool Instruction::isCommutative(unsigned op) { |
| 353 | switch (op) { |
| 354 | case Add: |
Dan Gohman | ae3a0be | 2009-06-04 22:49:04 +0000 | [diff] [blame] | 355 | case FAdd: |
Chris Lattner | f2da724 | 2002-10-31 04:14:01 +0000 | [diff] [blame] | 356 | case Mul: |
Dan Gohman | ae3a0be | 2009-06-04 22:49:04 +0000 | [diff] [blame] | 357 | case FMul: |
Misha Brukman | fd93908 | 2005-04-21 23:48:37 +0000 | [diff] [blame] | 358 | case And: |
Chris Lattner | f2da724 | 2002-10-31 04:14:01 +0000 | [diff] [blame] | 359 | case Or: |
| 360 | case Xor: |
Chris Lattner | f2da724 | 2002-10-31 04:14:01 +0000 | [diff] [blame] | 361 | return true; |
| 362 | default: |
| 363 | return false; |
| 364 | } |
| 365 | } |
Tanya Lattner | 741bb00 | 2003-07-31 04:05:50 +0000 | [diff] [blame] | 366 | |
Dan Gohman | 95c2cc5 | 2008-10-15 22:56:21 +0000 | [diff] [blame] | 367 | /// isTrapping - Return true if the instruction may trap. |
Tanya Lattner | 741bb00 | 2003-07-31 04:05:50 +0000 | [diff] [blame] | 368 | /// |
Tanya Lattner | ec127bb | 2003-07-31 05:06:09 +0000 | [diff] [blame] | 369 | bool Instruction::isTrapping(unsigned op) { |
Tanya Lattner | 741bb00 | 2003-07-31 04:05:50 +0000 | [diff] [blame] | 370 | switch(op) { |
Reid Spencer | 1628cec | 2006-10-26 06:15:43 +0000 | [diff] [blame] | 371 | case UDiv: |
| 372 | case SDiv: |
| 373 | case FDiv: |
Reid Spencer | 0a783f7 | 2006-11-02 01:53:59 +0000 | [diff] [blame] | 374 | case URem: |
| 375 | case SRem: |
| 376 | case FRem: |
Tanya Lattner | 741bb00 | 2003-07-31 04:05:50 +0000 | [diff] [blame] | 377 | case Load: |
| 378 | case Store: |
| 379 | case Call: |
| 380 | case Invoke: |
Dan Gohman | d660f97 | 2008-04-14 15:07:08 +0000 | [diff] [blame] | 381 | case VAArg: |
Tanya Lattner | 741bb00 | 2003-07-31 04:05:50 +0000 | [diff] [blame] | 382 | return true; |
| 383 | default: |
| 384 | return false; |
| 385 | } |
| 386 | } |