2003-10-13 11:32:08 +08:00
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//===-- Instruction.cpp - Implement the Instruction class -----------------===//
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2005-04-22 07:48:37 +08:00
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//
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2003-10-21 03:43:21 +08:00
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// The LLVM Compiler Infrastructure
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//
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2007-12-30 04:36:04 +08:00
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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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2005-04-22 07:48:37 +08:00
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//
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2003-10-21 03:43:21 +08:00
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//===----------------------------------------------------------------------===//
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2001-06-07 04:29:01 +08:00
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//
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// This file implements the Instruction class for the VMCore library.
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//
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//===----------------------------------------------------------------------===//
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2006-11-20 09:22:35 +08:00
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#include "llvm/Type.h"
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2004-11-30 10:51:53 +08:00
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#include "llvm/Instructions.h"
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2002-04-08 04:49:59 +08:00
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#include "llvm/Function.h"
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2007-12-04 04:06:50 +08:00
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#include "llvm/Support/CallSite.h"
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2004-09-02 06:55:40 +08:00
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#include "llvm/Support/LeakDetector.h"
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2003-11-21 01:45:12 +08:00
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using namespace llvm;
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2003-11-12 06:41:34 +08:00
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2005-01-29 08:35:33 +08:00
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Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps,
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2007-02-24 08:55:48 +08:00
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Instruction *InsertBefore)
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2007-02-12 13:18:08 +08:00
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: User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(0) {
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2002-09-09 02:59:35 +08:00
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// Make sure that we get added to a basicblock
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LeakDetector::addGarbageObject(this);
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2002-09-10 23:45:53 +08:00
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// If requested, insert this instruction into a basic block...
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if (InsertBefore) {
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assert(InsertBefore->getParent() &&
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"Instruction to insert before is not in a basic block!");
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InsertBefore->getParent()->getInstList().insert(InsertBefore, this);
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}
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2001-06-07 04:29:01 +08:00
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}
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2005-01-29 08:35:33 +08:00
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Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps,
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2007-02-24 08:55:48 +08:00
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BasicBlock *InsertAtEnd)
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2007-02-12 13:18:08 +08:00
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: User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(0) {
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2005-01-29 08:35:33 +08:00
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// Make sure that we get added to a basicblock
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LeakDetector::addGarbageObject(this);
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2004-05-27 05:41:09 +08:00
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// append this instruction into the basic block
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assert(InsertAtEnd && "Basic block to append to may not be NULL!");
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InsertAtEnd->getInstList().push_back(this);
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2007-02-13 15:54:42 +08:00
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}
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2006-06-22 00:53:47 +08:00
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// Out of line virtual method, so the vtable, etc has a home.
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2007-12-10 10:14:30 +08:00
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Instruction::~Instruction() {
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assert(Parent == 0 && "Instruction still linked in the program!");
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2006-06-22 00:53:47 +08:00
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}
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2002-09-07 05:33:15 +08:00
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void Instruction::setParent(BasicBlock *P) {
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2004-02-04 09:06:38 +08:00
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if (getParent()) {
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if (!P) LeakDetector::addGarbageObject(this);
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} else {
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if (P) LeakDetector::removeGarbageObject(this);
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}
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2002-09-09 02:59:35 +08:00
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2002-09-07 05:33:15 +08:00
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Parent = P;
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}
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2004-10-12 06:21:39 +08:00
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void Instruction::removeFromParent() {
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getParent()->getInstList().remove(this);
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}
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void Instruction::eraseFromParent() {
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getParent()->getInstList().erase(this);
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}
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2002-07-15 07:09:40 +08:00
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2008-06-18 02:29:27 +08:00
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/// insertBefore - Insert an unlinked instructions into a basic block
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/// immediately before the specified instruction.
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void Instruction::insertBefore(Instruction *InsertPos) {
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InsertPos->getParent()->getInstList().insert(InsertPos, this);
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}
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2005-08-08 13:21:50 +08:00
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/// moveBefore - Unlink this instruction from its current basic block and
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/// insert it into the basic block that MovePos lives in, right before
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/// MovePos.
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void Instruction::moveBefore(Instruction *MovePos) {
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MovePos->getParent()->getInstList().splice(MovePos,getParent()->getInstList(),
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this);
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}
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2002-07-15 07:09:40 +08:00
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const char *Instruction::getOpcodeName(unsigned OpCode) {
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switch (OpCode) {
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// Terminators
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2002-08-15 02:18:02 +08:00
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case Ret: return "ret";
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case Br: return "br";
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2002-07-15 07:09:40 +08:00
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case Switch: return "switch";
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case Invoke: return "invoke";
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2003-09-09 02:54:36 +08:00
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case Unwind: return "unwind";
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2004-10-17 02:08:06 +08:00
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case Unreachable: return "unreachable";
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2005-04-22 07:48:37 +08:00
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2002-07-15 07:09:40 +08:00
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// Standard binary operators...
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case Add: return "add";
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case Sub: return "sub";
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case Mul: return "mul";
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2006-10-26 14:15:43 +08:00
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case UDiv: return "udiv";
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case SDiv: return "sdiv";
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case FDiv: return "fdiv";
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2006-11-02 09:53:59 +08:00
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case URem: return "urem";
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case SRem: return "srem";
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case FRem: return "frem";
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2002-07-15 07:09:40 +08:00
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// Logical operators...
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case And: return "and";
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case Or : return "or";
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case Xor: return "xor";
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// Memory instructions...
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case Malloc: return "malloc";
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case Free: return "free";
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case Alloca: return "alloca";
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case Load: return "load";
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case Store: return "store";
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case GetElementPtr: return "getelementptr";
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2005-04-22 07:48:37 +08:00
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2006-11-27 09:05:10 +08:00
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// Convert instructions...
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case Trunc: return "trunc";
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case ZExt: return "zext";
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case SExt: return "sext";
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case FPTrunc: return "fptrunc";
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case FPExt: return "fpext";
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case FPToUI: return "fptoui";
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case FPToSI: return "fptosi";
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case UIToFP: return "uitofp";
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case SIToFP: return "sitofp";
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case IntToPtr: return "inttoptr";
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case PtrToInt: return "ptrtoint";
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case BitCast: return "bitcast";
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2002-07-15 07:09:40 +08:00
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// Other instructions...
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2006-12-03 14:27:29 +08:00
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case ICmp: return "icmp";
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case FCmp: return "fcmp";
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2008-05-13 03:01:56 +08:00
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case VICmp: return "vicmp";
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case VFCmp: return "vfcmp";
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2006-11-27 09:05:10 +08:00
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case PHI: return "phi";
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case Select: return "select";
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case Call: return "call";
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case Shl: return "shl";
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case LShr: return "lshr";
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case AShr: return "ashr";
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case VAArg: return "va_arg";
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2006-01-11 03:05:34 +08:00
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case ExtractElement: return "extractelement";
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2006-11-27 09:05:10 +08:00
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case InsertElement: return "insertelement";
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case ShuffleVector: return "shufflevector";
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2008-05-30 18:31:54 +08:00
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case ExtractValue: return "extractvalue";
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case InsertValue: return "insertvalue";
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2003-05-08 10:44:12 +08:00
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2002-07-15 07:09:40 +08:00
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default: return "<Invalid operator> ";
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}
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2005-04-22 07:48:37 +08:00
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2002-07-15 07:09:40 +08:00
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return 0;
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}
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2002-10-31 12:14:01 +08:00
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2004-11-30 10:51:53 +08:00
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/// isIdenticalTo - Return true if the specified instruction is exactly
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/// identical to the current one. This means that all operands match and any
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/// extra information (e.g. load is volatile) agree.
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bool Instruction::isIdenticalTo(Instruction *I) const {
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if (getOpcode() != I->getOpcode() ||
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getNumOperands() != I->getNumOperands() ||
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getType() != I->getType())
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return false;
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// We have two instructions of identical opcode and #operands. Check to see
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// if all operands are the same.
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for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
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if (getOperand(i) != I->getOperand(i))
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return false;
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// Check special state that is a part of some instructions.
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if (const LoadInst *LI = dyn_cast<LoadInst>(this))
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2008-10-16 09:24:45 +08:00
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return LI->isVolatile() == cast<LoadInst>(I)->isVolatile() &&
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LI->getAlignment() == cast<LoadInst>(I)->getAlignment();
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2004-11-30 10:51:53 +08:00
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if (const StoreInst *SI = dyn_cast<StoreInst>(this))
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2008-10-16 09:24:45 +08:00
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return SI->isVolatile() == cast<StoreInst>(I)->isVolatile() &&
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SI->getAlignment() == cast<StoreInst>(I)->getAlignment();
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2006-12-23 14:05:41 +08:00
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if (const CmpInst *CI = dyn_cast<CmpInst>(this))
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return CI->getPredicate() == cast<CmpInst>(I)->getPredicate();
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if (const CallInst *CI = dyn_cast<CallInst>(this))
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2008-10-16 09:24:45 +08:00
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return CI->isTailCall() == cast<CallInst>(I)->isTailCall() &&
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CI->getCallingConv() == cast<CallInst>(I)->getCallingConv() &&
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CI->getAttributes().getRawPointer() ==
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cast<CallInst>(I)->getAttributes().getRawPointer();
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if (const InvokeInst *CI = dyn_cast<InvokeInst>(this))
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return CI->getCallingConv() == cast<CallInst>(I)->getCallingConv() &&
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CI->getAttributes().getRawPointer() ==
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cast<CallInst>(I)->getAttributes().getRawPointer();
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if (const InsertValueInst *IVI = dyn_cast<InsertValueInst>(this)) {
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if (IVI->getNumIndices() != cast<InsertValueInst>(I)->getNumIndices())
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return false;
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for (unsigned i = 0, e = IVI->getNumIndices(); i != e; ++i)
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if (IVI->idx_begin()[i] != cast<InsertValueInst>(I)->idx_begin()[i])
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return false;
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return true;
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}
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if (const ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(this)) {
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if (EVI->getNumIndices() != cast<ExtractValueInst>(I)->getNumIndices())
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return false;
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for (unsigned i = 0, e = EVI->getNumIndices(); i != e; ++i)
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if (EVI->idx_begin()[i] != cast<ExtractValueInst>(I)->idx_begin()[i])
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return false;
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return true;
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}
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2006-12-23 14:05:41 +08:00
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return true;
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}
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// isSameOperationAs
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bool Instruction::isSameOperationAs(Instruction *I) const {
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if (getOpcode() != I->getOpcode() || getType() != I->getType() ||
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getNumOperands() != I->getNumOperands())
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return false;
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// We have two instructions of identical opcode and #operands. Check to see
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// if all operands are the same type
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for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
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if (getOperand(i)->getType() != I->getOperand(i)->getType())
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return false;
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// Check special state that is a part of some instructions.
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if (const LoadInst *LI = dyn_cast<LoadInst>(this))
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2008-10-16 09:24:45 +08:00
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return LI->isVolatile() == cast<LoadInst>(I)->isVolatile() &&
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LI->getAlignment() == cast<LoadInst>(I)->getAlignment();
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2006-12-23 14:05:41 +08:00
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if (const StoreInst *SI = dyn_cast<StoreInst>(this))
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2008-10-16 09:24:45 +08:00
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return SI->isVolatile() == cast<StoreInst>(I)->isVolatile() &&
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SI->getAlignment() == cast<StoreInst>(I)->getAlignment();
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2006-12-23 14:05:41 +08:00
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if (const CmpInst *CI = dyn_cast<CmpInst>(this))
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return CI->getPredicate() == cast<CmpInst>(I)->getPredicate();
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2005-05-06 13:51:46 +08:00
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if (const CallInst *CI = dyn_cast<CallInst>(this))
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2008-10-16 09:24:45 +08:00
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return CI->isTailCall() == cast<CallInst>(I)->isTailCall() &&
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CI->getCallingConv() == cast<CallInst>(I)->getCallingConv() &&
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CI->getAttributes().getRawPointer() ==
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cast<CallInst>(I)->getAttributes().getRawPointer();
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if (const InvokeInst *CI = dyn_cast<InvokeInst>(this))
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return CI->getCallingConv() == cast<CallInst>(I)->getCallingConv() &&
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CI->getAttributes().getRawPointer() ==
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cast<CallInst>(I)->getAttributes().getRawPointer();
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if (const InsertValueInst *IVI = dyn_cast<InsertValueInst>(this)) {
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if (IVI->getNumIndices() != cast<InsertValueInst>(I)->getNumIndices())
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return false;
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for (unsigned i = 0, e = IVI->getNumIndices(); i != e; ++i)
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if (IVI->idx_begin()[i] != cast<InsertValueInst>(I)->idx_begin()[i])
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return false;
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return true;
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}
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if (const ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(this)) {
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if (EVI->getNumIndices() != cast<ExtractValueInst>(I)->getNumIndices())
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return false;
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for (unsigned i = 0, e = EVI->getNumIndices(); i != e; ++i)
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if (EVI->idx_begin()[i] != cast<ExtractValueInst>(I)->idx_begin()[i])
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return false;
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return true;
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}
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2006-12-23 14:05:41 +08:00
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2004-11-30 10:51:53 +08:00
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return true;
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}
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2008-04-21 06:11:30 +08:00
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/// isUsedOutsideOfBlock - Return true if there are any uses of I outside of the
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/// specified block. Note that PHI nodes are considered to evaluate their
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/// operands in the corresponding predecessor block.
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bool Instruction::isUsedOutsideOfBlock(const BasicBlock *BB) const {
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for (use_const_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
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// PHI nodes uses values in the corresponding predecessor block. For other
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// instructions, just check to see whether the parent of the use matches up.
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const PHINode *PN = dyn_cast<PHINode>(*UI);
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if (PN == 0) {
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if (cast<Instruction>(*UI)->getParent() != BB)
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return true;
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continue;
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}
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unsigned UseOperand = UI.getOperandNo();
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if (PN->getIncomingBlock(UseOperand/2) != BB)
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return true;
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}
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return false;
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}
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2008-05-09 01:16:51 +08:00
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/// mayReadFromMemory - Return true if this instruction may read memory.
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///
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bool Instruction::mayReadFromMemory() const {
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switch (getOpcode()) {
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default: return false;
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case Instruction::Free:
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case Instruction::VAArg:
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2008-05-09 05:58:49 +08:00
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case Instruction::Load:
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2008-05-09 01:16:51 +08:00
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return true;
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case Instruction::Call:
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return !cast<CallInst>(this)->doesNotAccessMemory();
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case Instruction::Invoke:
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return !cast<InvokeInst>(this)->doesNotAccessMemory();
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2008-05-09 05:58:49 +08:00
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case Instruction::Store:
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|
return cast<StoreInst>(this)->isVolatile();
|
2008-05-09 01:16:51 +08:00
|
|
|
}
|
|
|
|
}
|
2008-04-21 06:11:30 +08:00
|
|
|
|
2007-02-16 07:15:00 +08:00
|
|
|
/// mayWriteToMemory - Return true if this instruction may modify memory.
|
|
|
|
///
|
|
|
|
bool Instruction::mayWriteToMemory() const {
|
|
|
|
switch (getOpcode()) {
|
|
|
|
default: return false;
|
|
|
|
case Instruction::Free:
|
2007-12-04 04:06:50 +08:00
|
|
|
case Instruction::Store:
|
2007-02-16 07:15:00 +08:00
|
|
|
case Instruction::VAArg:
|
|
|
|
return true;
|
|
|
|
case Instruction::Call:
|
2007-12-04 04:06:50 +08:00
|
|
|
return !cast<CallInst>(this)->onlyReadsMemory();
|
2008-05-09 01:16:51 +08:00
|
|
|
case Instruction::Invoke:
|
|
|
|
return !cast<InvokeInst>(this)->onlyReadsMemory();
|
2007-02-16 07:15:00 +08:00
|
|
|
case Instruction::Load:
|
|
|
|
return cast<LoadInst>(this)->isVolatile();
|
|
|
|
}
|
|
|
|
}
|
2002-10-31 12:14:01 +08:00
|
|
|
|
|
|
|
/// isAssociative - Return true if the instruction is associative:
|
|
|
|
///
|
|
|
|
/// Associative operators satisfy: x op (y op z) === (x op y) op z)
|
|
|
|
///
|
|
|
|
/// In LLVM, the Add, Mul, And, Or, and Xor operators are associative, when not
|
|
|
|
/// applied to floating point types.
|
|
|
|
///
|
|
|
|
bool Instruction::isAssociative(unsigned Opcode, const Type *Ty) {
|
2006-10-27 02:27:26 +08:00
|
|
|
if (Opcode == And || Opcode == Or || Opcode == Xor)
|
|
|
|
return true;
|
|
|
|
|
|
|
|
// Add/Mul reassociate unless they are FP or FP vectors.
|
|
|
|
if (Opcode == Add || Opcode == Mul)
|
|
|
|
return !Ty->isFPOrFPVector();
|
2002-10-31 12:14:01 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/// isCommutative - Return true if the instruction is commutative:
|
|
|
|
///
|
2003-10-11 01:54:14 +08:00
|
|
|
/// Commutative operators satisfy: (x op y) === (y op x)
|
2002-10-31 12:14:01 +08:00
|
|
|
///
|
|
|
|
/// In LLVM, these are the associative operators, plus SetEQ and SetNE, when
|
|
|
|
/// applied to any type.
|
|
|
|
///
|
|
|
|
bool Instruction::isCommutative(unsigned op) {
|
|
|
|
switch (op) {
|
|
|
|
case Add:
|
|
|
|
case Mul:
|
2005-04-22 07:48:37 +08:00
|
|
|
case And:
|
2002-10-31 12:14:01 +08:00
|
|
|
case Or:
|
|
|
|
case Xor:
|
|
|
|
return true;
|
|
|
|
default:
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
}
|
2003-07-31 12:05:50 +08:00
|
|
|
|
2008-10-16 06:56:21 +08:00
|
|
|
/// isTrapping - Return true if the instruction may trap.
|
2003-07-31 12:05:50 +08:00
|
|
|
///
|
2003-07-31 13:06:09 +08:00
|
|
|
bool Instruction::isTrapping(unsigned op) {
|
2003-07-31 12:05:50 +08:00
|
|
|
switch(op) {
|
2006-10-26 14:15:43 +08:00
|
|
|
case UDiv:
|
|
|
|
case SDiv:
|
|
|
|
case FDiv:
|
2006-11-02 09:53:59 +08:00
|
|
|
case URem:
|
|
|
|
case SRem:
|
|
|
|
case FRem:
|
2003-07-31 12:05:50 +08:00
|
|
|
case Load:
|
|
|
|
case Store:
|
|
|
|
case Call:
|
|
|
|
case Invoke:
|
2008-04-14 23:07:08 +08:00
|
|
|
case VAArg:
|
2003-07-31 12:05:50 +08:00
|
|
|
return true;
|
|
|
|
default:
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
}
|