1 //===-- SparcMCCodeEmitter.cpp - Convert Sparc code to machine code -------===//
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 implements the SparcMCCodeEmitter class.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "SparcMCExpr.h"
15 #include "MCTargetDesc/SparcFixupKinds.h"
16 #include "SparcMCTargetDesc.h"
17 #include "llvm/ADT/Statistic.h"
18 #include "llvm/MC/MCCodeEmitter.h"
19 #include "llvm/MC/MCContext.h"
20 #include "llvm/MC/MCExpr.h"
21 #include "llvm/MC/MCInst.h"
22 #include "llvm/MC/MCRegisterInfo.h"
23 #include "llvm/MC/MCSymbol.h"
24 #include "llvm/MC/MCAsmInfo.h"
25 #include "llvm/Support/raw_ostream.h"
26
27 using namespace llvm;
28
29 #define DEBUG_TYPE "mccodeemitter"
30
31 STATISTIC(MCNumEmitted, "Number of MC instructions emitted");
32
33 namespace {
34 class SparcMCCodeEmitter : public MCCodeEmitter {
35 SparcMCCodeEmitter(const SparcMCCodeEmitter &) = delete;
36 void operator=(const SparcMCCodeEmitter &) = delete;
37 MCContext &Ctx;
38
39 public:
SparcMCCodeEmitter(MCContext & ctx)40 SparcMCCodeEmitter(MCContext &ctx): Ctx(ctx) {}
41
~SparcMCCodeEmitter()42 ~SparcMCCodeEmitter() override {}
43
44 void encodeInstruction(const MCInst &MI, raw_ostream &OS,
45 SmallVectorImpl<MCFixup> &Fixups,
46 const MCSubtargetInfo &STI) const override;
47
48 // getBinaryCodeForInstr - TableGen'erated function for getting the
49 // binary encoding for an instruction.
50 uint64_t getBinaryCodeForInstr(const MCInst &MI,
51 SmallVectorImpl<MCFixup> &Fixups,
52 const MCSubtargetInfo &STI) const;
53
54 /// getMachineOpValue - Return binary encoding of operand. If the machine
55 /// operand requires relocation, record the relocation and return zero.
56 unsigned getMachineOpValue(const MCInst &MI, const MCOperand &MO,
57 SmallVectorImpl<MCFixup> &Fixups,
58 const MCSubtargetInfo &STI) const;
59
60 unsigned getCallTargetOpValue(const MCInst &MI, unsigned OpNo,
61 SmallVectorImpl<MCFixup> &Fixups,
62 const MCSubtargetInfo &STI) const;
63 unsigned getBranchTargetOpValue(const MCInst &MI, unsigned OpNo,
64 SmallVectorImpl<MCFixup> &Fixups,
65 const MCSubtargetInfo &STI) const;
66 unsigned getBranchPredTargetOpValue(const MCInst &MI, unsigned OpNo,
67 SmallVectorImpl<MCFixup> &Fixups,
68 const MCSubtargetInfo &STI) const;
69 unsigned getBranchOnRegTargetOpValue(const MCInst &MI, unsigned OpNo,
70 SmallVectorImpl<MCFixup> &Fixups,
71 const MCSubtargetInfo &STI) const;
72
73 };
74 } // end anonymous namespace
75
createSparcMCCodeEmitter(const MCInstrInfo & MCII,const MCRegisterInfo & MRI,MCContext & Ctx)76 MCCodeEmitter *llvm::createSparcMCCodeEmitter(const MCInstrInfo &MCII,
77 const MCRegisterInfo &MRI,
78 MCContext &Ctx) {
79 return new SparcMCCodeEmitter(Ctx);
80 }
81
encodeInstruction(const MCInst & MI,raw_ostream & OS,SmallVectorImpl<MCFixup> & Fixups,const MCSubtargetInfo & STI) const82 void SparcMCCodeEmitter::encodeInstruction(const MCInst &MI, raw_ostream &OS,
83 SmallVectorImpl<MCFixup> &Fixups,
84 const MCSubtargetInfo &STI) const {
85 unsigned Bits = getBinaryCodeForInstr(MI, Fixups, STI);
86
87 if (Ctx.getAsmInfo()->isLittleEndian()) {
88 // Output the bits in little-endian byte order.
89 support::endian::Writer<support::little>(OS).write<uint32_t>(Bits);
90 } else {
91 // Output the bits in big-endian byte order.
92 support::endian::Writer<support::big>(OS).write<uint32_t>(Bits);
93 }
94 unsigned tlsOpNo = 0;
95 switch (MI.getOpcode()) {
96 default: break;
97 case SP::TLS_CALL: tlsOpNo = 1; break;
98 case SP::TLS_ADDrr:
99 case SP::TLS_ADDXrr:
100 case SP::TLS_LDrr:
101 case SP::TLS_LDXrr: tlsOpNo = 3; break;
102 }
103 if (tlsOpNo != 0) {
104 const MCOperand &MO = MI.getOperand(tlsOpNo);
105 uint64_t op = getMachineOpValue(MI, MO, Fixups, STI);
106 assert(op == 0 && "Unexpected operand value!");
107 (void)op; // suppress warning.
108 }
109
110 ++MCNumEmitted; // Keep track of the # of mi's emitted.
111 }
112
113
114 unsigned SparcMCCodeEmitter::
getMachineOpValue(const MCInst & MI,const MCOperand & MO,SmallVectorImpl<MCFixup> & Fixups,const MCSubtargetInfo & STI) const115 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
116 SmallVectorImpl<MCFixup> &Fixups,
117 const MCSubtargetInfo &STI) const {
118
119 if (MO.isReg())
120 return Ctx.getRegisterInfo()->getEncodingValue(MO.getReg());
121
122 if (MO.isImm())
123 return MO.getImm();
124
125 assert(MO.isExpr());
126 const MCExpr *Expr = MO.getExpr();
127 if (const SparcMCExpr *SExpr = dyn_cast<SparcMCExpr>(Expr)) {
128 MCFixupKind Kind = (MCFixupKind)SExpr->getFixupKind();
129 Fixups.push_back(MCFixup::create(0, Expr, Kind));
130 return 0;
131 }
132
133 int64_t Res;
134 if (Expr->evaluateAsAbsolute(Res))
135 return Res;
136
137 llvm_unreachable("Unhandled expression!");
138 return 0;
139 }
140
141 unsigned SparcMCCodeEmitter::
getCallTargetOpValue(const MCInst & MI,unsigned OpNo,SmallVectorImpl<MCFixup> & Fixups,const MCSubtargetInfo & STI) const142 getCallTargetOpValue(const MCInst &MI, unsigned OpNo,
143 SmallVectorImpl<MCFixup> &Fixups,
144 const MCSubtargetInfo &STI) const {
145 const MCOperand &MO = MI.getOperand(OpNo);
146 if (MO.isReg() || MO.isImm())
147 return getMachineOpValue(MI, MO, Fixups, STI);
148
149 if (MI.getOpcode() == SP::TLS_CALL) {
150 // No fixups for __tls_get_addr. Will emit for fixups for tls_symbol in
151 // encodeInstruction.
152 #ifndef NDEBUG
153 // Verify that the callee is actually __tls_get_addr.
154 const SparcMCExpr *SExpr = dyn_cast<SparcMCExpr>(MO.getExpr());
155 assert(SExpr && SExpr->getSubExpr()->getKind() == MCExpr::SymbolRef &&
156 "Unexpected expression in TLS_CALL");
157 const MCSymbolRefExpr *SymExpr = cast<MCSymbolRefExpr>(SExpr->getSubExpr());
158 assert(SymExpr->getSymbol().getName() == "__tls_get_addr" &&
159 "Unexpected function for TLS_CALL");
160 #endif
161 return 0;
162 }
163
164 MCFixupKind fixupKind = (MCFixupKind)Sparc::fixup_sparc_call30;
165
166 if (const SparcMCExpr *SExpr = dyn_cast<SparcMCExpr>(MO.getExpr())) {
167 if (SExpr->getKind() == SparcMCExpr::VK_Sparc_WPLT30)
168 fixupKind = (MCFixupKind)Sparc::fixup_sparc_wplt30;
169 }
170
171 Fixups.push_back(MCFixup::create(0, MO.getExpr(), fixupKind));
172
173 return 0;
174 }
175
176 unsigned SparcMCCodeEmitter::
getBranchTargetOpValue(const MCInst & MI,unsigned OpNo,SmallVectorImpl<MCFixup> & Fixups,const MCSubtargetInfo & STI) const177 getBranchTargetOpValue(const MCInst &MI, unsigned OpNo,
178 SmallVectorImpl<MCFixup> &Fixups,
179 const MCSubtargetInfo &STI) const {
180 const MCOperand &MO = MI.getOperand(OpNo);
181 if (MO.isReg() || MO.isImm())
182 return getMachineOpValue(MI, MO, Fixups, STI);
183
184 Fixups.push_back(MCFixup::create(0, MO.getExpr(),
185 (MCFixupKind)Sparc::fixup_sparc_br22));
186 return 0;
187 }
188
189 unsigned SparcMCCodeEmitter::
getBranchPredTargetOpValue(const MCInst & MI,unsigned OpNo,SmallVectorImpl<MCFixup> & Fixups,const MCSubtargetInfo & STI) const190 getBranchPredTargetOpValue(const MCInst &MI, unsigned OpNo,
191 SmallVectorImpl<MCFixup> &Fixups,
192 const MCSubtargetInfo &STI) const {
193 const MCOperand &MO = MI.getOperand(OpNo);
194 if (MO.isReg() || MO.isImm())
195 return getMachineOpValue(MI, MO, Fixups, STI);
196
197 Fixups.push_back(MCFixup::create(0, MO.getExpr(),
198 (MCFixupKind)Sparc::fixup_sparc_br19));
199 return 0;
200 }
201 unsigned SparcMCCodeEmitter::
getBranchOnRegTargetOpValue(const MCInst & MI,unsigned OpNo,SmallVectorImpl<MCFixup> & Fixups,const MCSubtargetInfo & STI) const202 getBranchOnRegTargetOpValue(const MCInst &MI, unsigned OpNo,
203 SmallVectorImpl<MCFixup> &Fixups,
204 const MCSubtargetInfo &STI) const {
205 const MCOperand &MO = MI.getOperand(OpNo);
206 if (MO.isReg() || MO.isImm())
207 return getMachineOpValue(MI, MO, Fixups, STI);
208
209 Fixups.push_back(MCFixup::create(0, MO.getExpr(),
210 (MCFixupKind)Sparc::fixup_sparc_br16_2));
211 Fixups.push_back(MCFixup::create(0, MO.getExpr(),
212 (MCFixupKind)Sparc::fixup_sparc_br16_14));
213
214 return 0;
215 }
216
217
218
219 #include "SparcGenMCCodeEmitter.inc"
220