SystemZAsmPrinter.cpp revision fff1ff91915a613c0c23a5bbf7acb4694654d694 
1//===-- SystemZAsmPrinter.cpp - SystemZ LLVM assembly printer -------------===//
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// Streams SystemZ assembly language and associated data, in the form of
11// MCInsts and MCExprs respectively.
12//
13//===----------------------------------------------------------------------===//
14
15#include "SystemZAsmPrinter.h"
16#include "InstPrinter/SystemZInstPrinter.h"
17#include "SystemZConstantPoolValue.h"
18#include "SystemZMCInstLower.h"
19#include "llvm/CodeGen/MachineModuleInfoImpls.h"
20#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
21#include "llvm/MC/MCExpr.h"
22#include "llvm/MC/MCInstBuilder.h"
23#include "llvm/MC/MCStreamer.h"
24#include "llvm/Support/TargetRegistry.h"
25#include "llvm/Target/Mangler.h"
26
27using namespace llvm;
28
29// Return an RI instruction like MI with opcode Opcode, but with the
30// GR64 register operands turned into GR32s.
31static MCInst lowerRILow(const MachineInstr *MI, unsigned Opcode) {
32  if (MI->isCompare())
33    return MCInstBuilder(Opcode)
34      .addReg(SystemZMC::getRegAsGR32(MI->getOperand(0).getReg()))
35      .addImm(MI->getOperand(1).getImm());
36  else
37    return MCInstBuilder(Opcode)
38      .addReg(SystemZMC::getRegAsGR32(MI->getOperand(0).getReg()))
39      .addReg(SystemZMC::getRegAsGR32(MI->getOperand(1).getReg()))
40      .addImm(MI->getOperand(2).getImm());
41}
42
43// Return an RI instruction like MI with opcode Opcode, but with the
44// GR64 register operands turned into GRH32s.
45static MCInst lowerRIHigh(const MachineInstr *MI, unsigned Opcode) {
46  if (MI->isCompare())
47    return MCInstBuilder(Opcode)
48      .addReg(SystemZMC::getRegAsGRH32(MI->getOperand(0).getReg()))
49      .addImm(MI->getOperand(1).getImm());
50  else
51    return MCInstBuilder(Opcode)
52      .addReg(SystemZMC::getRegAsGRH32(MI->getOperand(0).getReg()))
53      .addReg(SystemZMC::getRegAsGRH32(MI->getOperand(1).getReg()))
54      .addImm(MI->getOperand(2).getImm());
55}
56
57// Return an RI instruction like MI with opcode Opcode, but with the
58// R2 register turned into a GR64.
59static MCInst lowerRIEfLow(const MachineInstr *MI, unsigned Opcode) {
60  return MCInstBuilder(Opcode)
61    .addReg(MI->getOperand(0).getReg())
62    .addReg(MI->getOperand(1).getReg())
63    .addReg(SystemZMC::getRegAsGR64(MI->getOperand(2).getReg()))
64    .addImm(MI->getOperand(3).getImm())
65    .addImm(MI->getOperand(4).getImm())
66    .addImm(MI->getOperand(5).getImm());
67}
68
69void SystemZAsmPrinter::EmitInstruction(const MachineInstr *MI) {
70  SystemZMCInstLower Lower(MF->getContext(), *this);
71  MCInst LoweredMI;
72  switch (MI->getOpcode()) {
73  case SystemZ::Return:
74    LoweredMI = MCInstBuilder(SystemZ::BR).addReg(SystemZ::R14D);
75    break;
76
77  case SystemZ::CallBRASL:
78    LoweredMI = MCInstBuilder(SystemZ::BRASL)
79      .addReg(SystemZ::R14D)
80      .addExpr(Lower.getExpr(MI->getOperand(0), MCSymbolRefExpr::VK_PLT));
81    break;
82
83  case SystemZ::CallBASR:
84    LoweredMI = MCInstBuilder(SystemZ::BASR)
85      .addReg(SystemZ::R14D)
86      .addReg(MI->getOperand(0).getReg());
87    break;
88
89  case SystemZ::CallJG:
90    LoweredMI = MCInstBuilder(SystemZ::JG)
91      .addExpr(Lower.getExpr(MI->getOperand(0), MCSymbolRefExpr::VK_PLT));
92    break;
93
94  case SystemZ::CallBR:
95    LoweredMI = MCInstBuilder(SystemZ::BR).addReg(SystemZ::R1D);
96    break;
97
98  case SystemZ::IILF64:
99    LoweredMI = MCInstBuilder(SystemZ::IILF)
100      .addReg(SystemZMC::getRegAsGR32(MI->getOperand(0).getReg()))
101      .addImm(MI->getOperand(2).getImm());
102    break;
103
104  case SystemZ::IIHF64:
105    LoweredMI = MCInstBuilder(SystemZ::IIHF)
106      .addReg(SystemZMC::getRegAsGRH32(MI->getOperand(0).getReg()))
107      .addImm(MI->getOperand(2).getImm());
108    break;
109
110  case SystemZ::RISBHH:
111  case SystemZ::RISBHL:
112    LoweredMI = lowerRIEfLow(MI, SystemZ::RISBHG);
113    break;
114
115  case SystemZ::RISBLH:
116  case SystemZ::RISBLL:
117    LoweredMI = lowerRIEfLow(MI, SystemZ::RISBLG);
118    break;
119
120#define LOWER_LOW(NAME)                                                 \
121  case SystemZ::NAME##64: LoweredMI = lowerRILow(MI, SystemZ::NAME); break
122
123  LOWER_LOW(IILL);
124  LOWER_LOW(IILH);
125  LOWER_LOW(TMLL);
126  LOWER_LOW(TMLH);
127  LOWER_LOW(NILL);
128  LOWER_LOW(NILH);
129  LOWER_LOW(NILF);
130  LOWER_LOW(OILL);
131  LOWER_LOW(OILH);
132  LOWER_LOW(OILF);
133  LOWER_LOW(XILF);
134
135#undef LOWER_LOW
136
137#define LOWER_HIGH(NAME) \
138  case SystemZ::NAME##64: LoweredMI = lowerRIHigh(MI, SystemZ::NAME); break
139
140  LOWER_HIGH(IIHL);
141  LOWER_HIGH(IIHH);
142  LOWER_HIGH(TMHL);
143  LOWER_HIGH(TMHH);
144  LOWER_HIGH(NIHL);
145  LOWER_HIGH(NIHH);
146  LOWER_HIGH(NIHF);
147  LOWER_HIGH(OIHL);
148  LOWER_HIGH(OIHH);
149  LOWER_HIGH(OIHF);
150  LOWER_HIGH(XIHF);
151
152#undef LOWER_HIGH
153
154  default:
155    Lower.lower(MI, LoweredMI);
156    break;
157  }
158  OutStreamer.EmitInstruction(LoweredMI);
159}
160
161// Convert a SystemZ-specific constant pool modifier into the associated
162// MCSymbolRefExpr variant kind.
163static MCSymbolRefExpr::VariantKind
164getModifierVariantKind(SystemZCP::SystemZCPModifier Modifier) {
165  switch (Modifier) {
166  case SystemZCP::NTPOFF: return MCSymbolRefExpr::VK_NTPOFF;
167  }
168  llvm_unreachable("Invalid SystemCPModifier!");
169}
170
171void SystemZAsmPrinter::
172EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
173  SystemZConstantPoolValue *ZCPV =
174    static_cast<SystemZConstantPoolValue*>(MCPV);
175
176  const MCExpr *Expr =
177    MCSymbolRefExpr::Create(getSymbol(ZCPV->getGlobalValue()),
178                            getModifierVariantKind(ZCPV->getModifier()),
179                            OutContext);
180  uint64_t Size = TM.getDataLayout()->getTypeAllocSize(ZCPV->getType());
181
182  OutStreamer.EmitValue(Expr, Size);
183}
184
185bool SystemZAsmPrinter::PrintAsmOperand(const MachineInstr *MI,
186                                        unsigned OpNo,
187                                        unsigned AsmVariant,
188                                        const char *ExtraCode,
189                                        raw_ostream &OS) {
190  if (ExtraCode && *ExtraCode == 'n') {
191    if (!MI->getOperand(OpNo).isImm())
192      return true;
193    OS << -int64_t(MI->getOperand(OpNo).getImm());
194  } else {
195    SystemZMCInstLower Lower(MF->getContext(), *this);
196    MCOperand MO(Lower.lowerOperand(MI->getOperand(OpNo)));
197    SystemZInstPrinter::printOperand(MO, OS);
198  }
199  return false;
200}
201
202bool SystemZAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
203                                              unsigned OpNo,
204                                              unsigned AsmVariant,
205                                              const char *ExtraCode,
206                                              raw_ostream &OS) {
207  SystemZInstPrinter::printAddress(MI->getOperand(OpNo).getReg(),
208                                   MI->getOperand(OpNo + 1).getImm(),
209                                   MI->getOperand(OpNo + 2).getReg(), OS);
210  return false;
211}
212
213void SystemZAsmPrinter::EmitEndOfAsmFile(Module &M) {
214  if (Subtarget->isTargetELF()) {
215    const TargetLoweringObjectFileELF &TLOFELF =
216      static_cast<const TargetLoweringObjectFileELF &>(getObjFileLowering());
217
218    MachineModuleInfoELF &MMIELF = MMI->getObjFileInfo<MachineModuleInfoELF>();
219
220    // Output stubs for external and common global variables.
221    MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
222    if (!Stubs.empty()) {
223      OutStreamer.SwitchSection(TLOFELF.getDataRelSection());
224      const DataLayout *TD = TM.getDataLayout();
225
226      for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
227        OutStreamer.EmitLabel(Stubs[i].first);
228        OutStreamer.EmitSymbolValue(Stubs[i].second.getPointer(),
229                                    TD->getPointerSize(0));
230      }
231      Stubs.clear();
232    }
233  }
234}
235
236// Force static initialization.
237extern "C" void LLVMInitializeSystemZAsmPrinter() {
238  RegisterAsmPrinter<SystemZAsmPrinter> X(TheSystemZTarget);
239}
240