MachineInstr.cpp revision a284cbf667e11660840dc7bae3ee9eeaa3c7cbd2 
1//===-- MachineInstr.cpp --------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file was developed by the LLVM research group and is distributed under
6// the University of Illinois Open Source License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// Methods common to all machine instructions.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/CodeGen/MachineInstr.h"
15#include "llvm/CodeGen/MachineFunction.h"
16#include "llvm/Target/TargetMachine.h"
17#include "llvm/Target/TargetInstrInfo.h"
18#include "llvm/Target/MRegisterInfo.h"
19#include "llvm/Support/LeakDetector.h"
20#include "llvm/Support/Streams.h"
21#include <ostream>
22using namespace llvm;
23
24/// MachineInstr ctor - This constructor creates a dummy MachineInstr with
25/// TID NULL and no operands.
26MachineInstr::MachineInstr()
27  : TID(0), NumImplicitOps(0), parent(0) {
28  // Make sure that we get added to a machine basicblock
29  LeakDetector::addGarbageObject(this);
30}
31
32void MachineInstr::addImplicitDefUseOperands() {
33  if (TID->ImplicitDefs)
34    for (const unsigned *ImpDefs = TID->ImplicitDefs; *ImpDefs; ++ImpDefs) {
35      MachineOperand Op;
36      Op.opType = MachineOperand::MO_Register;
37      Op.IsDef = true;
38      Op.IsImp = true;
39      Op.IsKill = false;
40      Op.IsDead = false;
41      Op.contents.RegNo = *ImpDefs;
42      Op.offset = 0;
43      Operands.push_back(Op);
44    }
45  if (TID->ImplicitUses)
46    for (const unsigned *ImpUses = TID->ImplicitUses; *ImpUses; ++ImpUses) {
47      MachineOperand Op;
48      Op.opType = MachineOperand::MO_Register;
49      Op.IsDef = false;
50      Op.IsImp = true;
51      Op.IsKill = false;
52      Op.IsDead = false;
53      Op.contents.RegNo = *ImpUses;
54      Op.offset = 0;
55      Operands.push_back(Op);
56    }
57}
58
59/// MachineInstr ctor - This constructor create a MachineInstr and add the
60/// implicit operands. It reserves space for number of operands specified by
61/// TargetInstrDescriptor or the numOperands if it is not zero. (for
62/// instructions with variable number of operands).
63MachineInstr::MachineInstr(const TargetInstrDescriptor &tid)
64  : TID(&tid), NumImplicitOps(0), parent(0) {
65  if (TID->ImplicitDefs)
66    for (const unsigned *ImpDefs = TID->ImplicitDefs; *ImpDefs; ++ImpDefs)
67      NumImplicitOps++;
68  if (TID->ImplicitUses)
69    for (const unsigned *ImpUses = TID->ImplicitUses; *ImpUses; ++ImpUses)
70      NumImplicitOps++;
71  Operands.reserve(NumImplicitOps + TID->numOperands);
72  addImplicitDefUseOperands();
73  // Make sure that we get added to a machine basicblock
74  LeakDetector::addGarbageObject(this);
75}
76
77/// MachineInstr ctor - Work exactly the same as the ctor above, except that the
78/// MachineInstr is created and added to the end of the specified basic block.
79///
80MachineInstr::MachineInstr(MachineBasicBlock *MBB,
81                           const TargetInstrDescriptor &tid)
82  : TID(&tid), NumImplicitOps(0), parent(0) {
83  assert(MBB && "Cannot use inserting ctor with null basic block!");
84  if (TID->ImplicitDefs)
85    for (const unsigned *ImpDefs = TID->ImplicitDefs; *ImpDefs; ++ImpDefs)
86      NumImplicitOps++;
87  if (TID->ImplicitUses)
88    for (const unsigned *ImpUses = TID->ImplicitUses; *ImpUses; ++ImpUses)
89      NumImplicitOps++;
90  Operands.reserve(NumImplicitOps + TID->numOperands);
91  addImplicitDefUseOperands();
92  // Make sure that we get added to a machine basicblock
93  LeakDetector::addGarbageObject(this);
94  MBB->push_back(this);  // Add instruction to end of basic block!
95}
96
97/// MachineInstr ctor - Copies MachineInstr arg exactly
98///
99MachineInstr::MachineInstr(const MachineInstr &MI) {
100  TID = MI.getInstrDescriptor();
101  NumImplicitOps = MI.NumImplicitOps;
102  Operands.reserve(MI.getNumOperands());
103
104  // Add operands
105  for (unsigned i = 0; i != MI.getNumOperands(); ++i)
106    Operands.push_back(MI.getOperand(i));
107
108  // Set parent, next, and prev to null
109  parent = 0;
110  prev = 0;
111  next = 0;
112}
113
114
115MachineInstr::~MachineInstr() {
116  LeakDetector::removeGarbageObject(this);
117}
118
119/// getOpcode - Returns the opcode of this MachineInstr.
120///
121const int MachineInstr::getOpcode() const {
122  return TID->Opcode;
123}
124
125/// removeFromParent - This method unlinks 'this' from the containing basic
126/// block, and returns it, but does not delete it.
127MachineInstr *MachineInstr::removeFromParent() {
128  assert(getParent() && "Not embedded in a basic block!");
129  getParent()->remove(this);
130  return this;
131}
132
133
134/// OperandComplete - Return true if it's illegal to add a new operand
135///
136bool MachineInstr::OperandsComplete() const {
137  unsigned short NumOperands = TID->numOperands;
138  if ((TID->Flags & M_VARIABLE_OPS) == 0 &&
139      getNumOperands()-NumImplicitOps >= NumOperands)
140    return true;  // Broken: we have all the operands of this instruction!
141  return false;
142}
143
144/// isIdenticalTo - Return true if this operand is identical to the specified
145/// operand.
146bool MachineOperand::isIdenticalTo(const MachineOperand &Other) const {
147  if (getType() != Other.getType()) return false;
148
149  switch (getType()) {
150  default: assert(0 && "Unrecognized operand type");
151  case MachineOperand::MO_Register:
152    return getReg() == Other.getReg() && isDef() == Other.isDef();
153  case MachineOperand::MO_Immediate:
154    return getImm() == Other.getImm();
155  case MachineOperand::MO_MachineBasicBlock:
156    return getMBB() == Other.getMBB();
157  case MachineOperand::MO_FrameIndex:
158    return getFrameIndex() == Other.getFrameIndex();
159  case MachineOperand::MO_ConstantPoolIndex:
160    return getConstantPoolIndex() == Other.getConstantPoolIndex() &&
161           getOffset() == Other.getOffset();
162  case MachineOperand::MO_JumpTableIndex:
163    return getJumpTableIndex() == Other.getJumpTableIndex();
164  case MachineOperand::MO_GlobalAddress:
165    return getGlobal() == Other.getGlobal() && getOffset() == Other.getOffset();
166  case MachineOperand::MO_ExternalSymbol:
167    return !strcmp(getSymbolName(), Other.getSymbolName()) &&
168           getOffset() == Other.getOffset();
169  }
170}
171
172/// findRegisterUseOperand() - Returns the MachineOperand that is a use of
173/// the specific register or NULL if it is not found.
174MachineOperand *MachineInstr::findRegisterUseOperand(unsigned Reg) {
175  for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
176    MachineOperand &MO = getOperand(i);
177    if (MO.isReg() && MO.isUse() && MO.getReg() == Reg)
178      return &MO;
179  }
180  return NULL;
181}
182
183/// copyKillDeadInfo - Copies kill / dead operand properties from MI.
184///
185void MachineInstr::copyKillDeadInfo(const MachineInstr *MI) {
186  for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
187    const MachineOperand &MO = MI->getOperand(i);
188    if (!MO.isReg() || (!MO.isKill() && !MO.isDead()))
189      continue;
190    for (unsigned j = 0, ee = getNumOperands(); j != ee; ++j) {
191      MachineOperand &MOp = getOperand(j);
192      if (!MOp.isIdenticalTo(MO))
193        continue;
194      if (MO.isKill())
195        MOp.setIsKill();
196      else
197        MOp.setIsDead();
198      break;
199    }
200  }
201}
202
203void MachineInstr::dump() const {
204  cerr << "  " << *this;
205}
206
207static inline void OutputReg(std::ostream &os, unsigned RegNo,
208                             const MRegisterInfo *MRI = 0) {
209  if (!RegNo || MRegisterInfo::isPhysicalRegister(RegNo)) {
210    if (MRI)
211      os << "%" << MRI->get(RegNo).Name;
212    else
213      os << "%mreg(" << RegNo << ")";
214  } else
215    os << "%reg" << RegNo;
216}
217
218static void print(const MachineOperand &MO, std::ostream &OS,
219                  const TargetMachine *TM) {
220  const MRegisterInfo *MRI = 0;
221
222  if (TM) MRI = TM->getRegisterInfo();
223
224  switch (MO.getType()) {
225  case MachineOperand::MO_Register:
226    OutputReg(OS, MO.getReg(), MRI);
227    break;
228  case MachineOperand::MO_Immediate:
229    OS << MO.getImmedValue();
230    break;
231  case MachineOperand::MO_MachineBasicBlock:
232    OS << "mbb<"
233       << ((Value*)MO.getMachineBasicBlock()->getBasicBlock())->getName()
234       << "," << (void*)MO.getMachineBasicBlock() << ">";
235    break;
236  case MachineOperand::MO_FrameIndex:
237    OS << "<fi#" << MO.getFrameIndex() << ">";
238    break;
239  case MachineOperand::MO_ConstantPoolIndex:
240    OS << "<cp#" << MO.getConstantPoolIndex() << ">";
241    break;
242  case MachineOperand::MO_JumpTableIndex:
243    OS << "<jt#" << MO.getJumpTableIndex() << ">";
244    break;
245  case MachineOperand::MO_GlobalAddress:
246    OS << "<ga:" << ((Value*)MO.getGlobal())->getName();
247    if (MO.getOffset()) OS << "+" << MO.getOffset();
248    OS << ">";
249    break;
250  case MachineOperand::MO_ExternalSymbol:
251    OS << "<es:" << MO.getSymbolName();
252    if (MO.getOffset()) OS << "+" << MO.getOffset();
253    OS << ">";
254    break;
255  default:
256    assert(0 && "Unrecognized operand type");
257  }
258}
259
260void MachineInstr::print(std::ostream &OS, const TargetMachine *TM) const {
261  unsigned StartOp = 0;
262
263   // Specialize printing if op#0 is definition
264  if (getNumOperands() && getOperand(0).isReg() && getOperand(0).isDef()) {
265    ::print(getOperand(0), OS, TM);
266    if (getOperand(0).isDead())
267      OS << "<dead>";
268    OS << " = ";
269    ++StartOp;   // Don't print this operand again!
270  }
271
272  if (TID)
273    OS << TID->Name;
274
275  for (unsigned i = StartOp, e = getNumOperands(); i != e; ++i) {
276    const MachineOperand& mop = getOperand(i);
277    if (i != StartOp)
278      OS << ",";
279    OS << " ";
280    ::print(mop, OS, TM);
281
282    if (mop.isReg()) {
283      if (mop.isDef() || mop.isKill() || mop.isDead() || mop.isImplicit()) {
284        OS << "<";
285        bool NeedComma = false;
286        if (mop.isImplicit()) {
287          OS << (mop.isDef() ? "imp-def" : "imp-use");
288          NeedComma = true;
289        } else if (mop.isDef()) {
290          OS << "def";
291          NeedComma = true;
292        }
293        if (mop.isKill() || mop.isDead()) {
294          if (NeedComma)
295            OS << ",";
296          if (mop.isKill())
297            OS << "kill";
298          if (mop.isDead())
299            OS << "dead";
300        }
301        OS << ">";
302      }
303    }
304  }
305
306  OS << "\n";
307}
308
309void MachineInstr::print(std::ostream &os) const {
310  // If the instruction is embedded into a basic block, we can find the target
311  // info for the instruction.
312  if (const MachineBasicBlock *MBB = getParent()) {
313    const MachineFunction *MF = MBB->getParent();
314    if (MF)
315      print(os, &MF->getTarget());
316    else
317      print(os, 0);
318  }
319
320  // Otherwise, print it out in the "raw" format without symbolic register names
321  // and such.
322  os << getInstrDescriptor()->Name;
323
324  for (unsigned i = 0, N = getNumOperands(); i < N; i++) {
325    os << "\t" << getOperand(i);
326    if (getOperand(i).isReg() && getOperand(i).isDef())
327      os << "<d>";
328  }
329
330  os << "\n";
331}
332
333void MachineOperand::print(std::ostream &OS) const {
334  switch (getType()) {
335  case MO_Register:
336    OutputReg(OS, getReg());
337    break;
338  case MO_Immediate:
339    OS << (long)getImmedValue();
340    break;
341  case MO_MachineBasicBlock:
342    OS << "<mbb:"
343       << ((Value*)getMachineBasicBlock()->getBasicBlock())->getName()
344       << "@" << (void*)getMachineBasicBlock() << ">";
345    break;
346  case MO_FrameIndex:
347    OS << "<fi#" << getFrameIndex() << ">";
348    break;
349  case MO_ConstantPoolIndex:
350    OS << "<cp#" << getConstantPoolIndex() << ">";
351    break;
352  case MO_JumpTableIndex:
353    OS << "<jt#" << getJumpTableIndex() << ">";
354    break;
355  case MO_GlobalAddress:
356    OS << "<ga:" << ((Value*)getGlobal())->getName() << ">";
357    break;
358  case MO_ExternalSymbol:
359    OS << "<es:" << getSymbolName() << ">";
360    break;
361  default:
362    assert(0 && "Unrecognized operand type");
363    break;
364  }
365}
366
367