LLVM  4.0.0
LanaiMCInstLower.cpp
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1 //=-- LanaiMCInstLower.cpp - Convert Lanai MachineInstr to an MCInst --------=//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file contains code to lower Lanai MachineInstrs to their corresponding
11 // MCInst records.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "LanaiMCInstLower.h"
16 
19 #include "llvm/ADT/SmallString.h"
23 #include "llvm/IR/Constants.h"
24 #include "llvm/MC/MCAsmInfo.h"
25 #include "llvm/MC/MCContext.h"
26 #include "llvm/MC/MCExpr.h"
27 #include "llvm/MC/MCInst.h"
30 
31 using namespace llvm;
32 
33 MCSymbol *
35  return Printer.getSymbol(MO.getGlobal());
36 }
37 
38 MCSymbol *
40  return Printer.GetBlockAddressSymbol(MO.getBlockAddress());
41 }
42 
43 MCSymbol *
45  return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
46 }
47 
50  raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
51  << Printer.getFunctionNumber() << '_'
52  << MO.getIndex();
53  // Create a symbol for the name.
54  return Ctx.getOrCreateSymbol(Name.str());
55 }
56 
57 MCSymbol *
60  raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
61  << Printer.getFunctionNumber() << '_'
62  << MO.getIndex();
63  // Create a symbol for the name.
64  return Ctx.getOrCreateSymbol(Name.str());
65 }
66 
68  MCSymbol *Sym) const {
70 
71  switch (MO.getTargetFlags()) {
74  break;
75  case LanaiII::MO_ABS_HI:
77  break;
78  case LanaiII::MO_ABS_LO:
80  break;
81  default:
82  llvm_unreachable("Unknown target flag on GV operand");
83  }
84 
85  const MCExpr *Expr =
87  if (!MO.isJTI() && MO.getOffset())
89  Expr, MCConstantExpr::create(MO.getOffset(), Ctx), Ctx);
90  Expr = LanaiMCExpr::create(Kind, Expr, Ctx);
91  return MCOperand::createExpr(Expr);
92 }
93 
94 void LanaiMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
95  OutMI.setOpcode(MI->getOpcode());
96 
97  for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) {
98  const MachineOperand &MO = MI->getOperand(I);
99 
100  MCOperand MCOp;
101  switch (MO.getType()) {
103  // Ignore all implicit register operands.
104  if (MO.isImplicit())
105  continue;
106  MCOp = MCOperand::createReg(MO.getReg());
107  break;
109  MCOp = MCOperand::createImm(MO.getImm());
110  break;
112  MCOp = MCOperand::createExpr(
114  break;
116  continue;
119  break;
122  break;
125  break;
127  MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
128  break;
131  break;
132  default:
133  MI->dump();
134  llvm_unreachable("unknown operand type");
135  }
136 
137  OutMI.addOperand(MCOp);
138  }
139 }
bool isImplicit() const
MCSymbol * GetGlobalAddressSymbol(const MachineOperand &MO) const
const GlobalValue * getGlobal() const
static const MCSymbolRefExpr * create(const MCSymbol *Symbol, MCContext &Ctx)
Definition: MCExpr.h:298
MCSymbol * getSymbol(const GlobalValue *GV) const
Definition: AsmPrinter.cpp:371
MachineBasicBlock * getMBB() const
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:39
static MCOperand createExpr(const MCExpr *Val)
Definition: MCInst.h:129
Address of indexed Jump Table for switch.
MCSymbol * GetJumpTableSymbol(const MachineOperand &MO) const
MCOperand LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const
A raw_ostream that writes to an SmallVector or SmallString.
Definition: raw_ostream.h:490
MachineBasicBlock reference.
unsigned getFunctionNumber() const
Return a unique ID for the current function.
Definition: AsmPrinter.cpp:140
const char * getSymbolName() const
static const LanaiMCExpr * create(VariantKind Kind, const MCExpr *Expr, MCContext &Ctx)
Definition: LanaiMCExpr.cpp:18
Mask of preserved registers.
bool isJTI() const
isJTI - Tests if this is a MO_JumpTableIndex operand.
static MCOperand createReg(unsigned Reg)
Definition: MCInst.h:111
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:34
Name of external global symbol.
StringRef getPrivateGlobalPrefix() const
Definition: MCAsmInfo.h:476
unsigned getNumOperands() const
Access to explicit operands of the instruction.
Definition: MachineInstr.h:277
MCSymbol * GetConstantPoolIndexSymbol(const MachineOperand &MO) const
int64_t getImm() const
static const MCBinaryExpr * createAdd(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:429
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:150
unsigned getOpcode() const
Returns the opcode of this MachineInstr.
Definition: MachineInstr.h:273
static GCRegistry::Add< CoreCLRGC > E("coreclr","CoreCLR-compatible GC")
Address of a global value.
unsigned getTargetFlags() const
const MCAsmInfo * MAI
Target Asm Printer information.
Definition: AsmPrinter.h:75
This file contains the declarations for the subclasses of Constant, which represent the different fla...
const MachineOperand & getOperand(unsigned i) const
Definition: MachineInstr.h:279
Address of a basic block.
int64_t getOffset() const
Return the offset from the symbol in this operand.
MCSymbol * getSymbol() const
Return the MCSymbol for this basic block.
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
void setOpcode(unsigned Op)
Definition: MCInst.h:158
void Lower(const MachineInstr *MI, MCInst &OutMI) const
MCSymbol * GetBlockAddressSymbol(const MachineOperand &MO) const
MachineOperand class - Representation of each machine instruction operand.
MCSymbol * GetExternalSymbolSymbol(const MachineOperand &MO) const
void dump(const TargetInstrInfo *TII=nullptr) const
StringRef str() const
Explicit conversion to StringRef.
Definition: SmallString.h:267
Representation of each machine instruction.
Definition: MachineInstr.h:52
MachineOperandType getType() const
getType - Returns the MachineOperandType for this operand.
MCSymbol * getOrCreateSymbol(const Twine &Name)
Lookup the symbol inside with the specified Name.
Definition: MCContext.cpp:114
#define I(x, y, z)
Definition: MD5.cpp:54
MCSymbol * GetBlockAddressSymbol(const BlockAddress *BA) const
Return the MCSymbol used to satisfy BlockAddress uses of the specified basic block.
const unsigned Kind
unsigned getReg() const
getReg - Returns the register number.
IRTranslator LLVM IR MI
void addOperand(const MCOperand &Op)
Definition: MCInst.h:168
const BlockAddress * getBlockAddress() const
Address of indexed Constant in Constant Pool.
Instances of this class represent operands of the MCInst class.
Definition: MCInst.h:33
MCSymbol * GetExternalSymbolSymbol(StringRef Sym) const
Return the MCSymbol for the specified ExternalSymbol.
static MCOperand createImm(int64_t Val)
Definition: MCInst.h:117
static const MCConstantExpr * create(int64_t Value, MCContext &Ctx)
Definition: MCExpr.cpp:149