1 //===-- X86ATTInstPrinter.cpp - AT&T assembly instruction printing --------===//
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 includes code for rendering MCInst instances as AT&T-style
11 // assembly.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "X86ATTInstPrinter.h"
16 #include "MCTargetDesc/X86BaseInfo.h"
17 #include "MCTargetDesc/X86MCTargetDesc.h"
18 #include "X86InstComments.h"
19 #include "llvm/MC/MCAsmInfo.h"
20 #include "llvm/MC/MCExpr.h"
21 #include "llvm/MC/MCInst.h"
22 #include "llvm/MC/MCInstrInfo.h"
23 #include "llvm/MC/MCRegisterInfo.h"
24 #include "llvm/MC/MCSubtargetInfo.h"
25 #include "llvm/Support/ErrorHandling.h"
26 #include "llvm/Support/Format.h"
27 #include "llvm/Support/FormattedStream.h"
28 using namespace llvm;
29
30 #define DEBUG_TYPE "asm-printer"
31
32 // Include the auto-generated portion of the assembly writer.
33 #define PRINT_ALIAS_INSTR
34 #include "X86GenAsmWriter.inc"
35
printRegName(raw_ostream & OS,unsigned RegNo) const36 void X86ATTInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
37 OS << markup("<reg:") << '%' << getRegisterName(RegNo) << markup(">");
38 }
39
printInst(const MCInst * MI,raw_ostream & OS,StringRef Annot,const MCSubtargetInfo & STI)40 void X86ATTInstPrinter::printInst(const MCInst *MI, raw_ostream &OS,
41 StringRef Annot, const MCSubtargetInfo &STI) {
42 const MCInstrDesc &Desc = MII.get(MI->getOpcode());
43 uint64_t TSFlags = Desc.TSFlags;
44
45 // If verbose assembly is enabled, we can print some informative comments.
46 if (CommentStream)
47 HasCustomInstComment =
48 EmitAnyX86InstComments(MI, *CommentStream, getRegisterName);
49
50 if (TSFlags & X86II::LOCK)
51 OS << "\tlock\t";
52
53 // Output CALLpcrel32 as "callq" in 64-bit mode.
54 // In Intel annotation it's always emitted as "call".
55 //
56 // TODO: Probably this hack should be redesigned via InstAlias in
57 // InstrInfo.td as soon as Requires clause is supported properly
58 // for InstAlias.
59 if (MI->getOpcode() == X86::CALLpcrel32 &&
60 (STI.getFeatureBits()[X86::Mode64Bit])) {
61 OS << "\tcallq\t";
62 printPCRelImm(MI, 0, OS);
63 }
64 // Try to print any aliases first.
65 else if (!printAliasInstr(MI, OS))
66 printInstruction(MI, OS);
67
68 // Next always print the annotation.
69 printAnnotation(OS, Annot);
70 }
71
printSSEAVXCC(const MCInst * MI,unsigned Op,raw_ostream & O)72 void X86ATTInstPrinter::printSSEAVXCC(const MCInst *MI, unsigned Op,
73 raw_ostream &O) {
74 int64_t Imm = MI->getOperand(Op).getImm();
75 switch (Imm) {
76 default: llvm_unreachable("Invalid ssecc/avxcc argument!");
77 case 0: O << "eq"; break;
78 case 1: O << "lt"; break;
79 case 2: O << "le"; break;
80 case 3: O << "unord"; break;
81 case 4: O << "neq"; break;
82 case 5: O << "nlt"; break;
83 case 6: O << "nle"; break;
84 case 7: O << "ord"; break;
85 case 8: O << "eq_uq"; break;
86 case 9: O << "nge"; break;
87 case 0xa: O << "ngt"; break;
88 case 0xb: O << "false"; break;
89 case 0xc: O << "neq_oq"; break;
90 case 0xd: O << "ge"; break;
91 case 0xe: O << "gt"; break;
92 case 0xf: O << "true"; break;
93 case 0x10: O << "eq_os"; break;
94 case 0x11: O << "lt_oq"; break;
95 case 0x12: O << "le_oq"; break;
96 case 0x13: O << "unord_s"; break;
97 case 0x14: O << "neq_us"; break;
98 case 0x15: O << "nlt_uq"; break;
99 case 0x16: O << "nle_uq"; break;
100 case 0x17: O << "ord_s"; break;
101 case 0x18: O << "eq_us"; break;
102 case 0x19: O << "nge_uq"; break;
103 case 0x1a: O << "ngt_uq"; break;
104 case 0x1b: O << "false_os"; break;
105 case 0x1c: O << "neq_os"; break;
106 case 0x1d: O << "ge_oq"; break;
107 case 0x1e: O << "gt_oq"; break;
108 case 0x1f: O << "true_us"; break;
109 }
110 }
111
printXOPCC(const MCInst * MI,unsigned Op,raw_ostream & O)112 void X86ATTInstPrinter::printXOPCC(const MCInst *MI, unsigned Op,
113 raw_ostream &O) {
114 int64_t Imm = MI->getOperand(Op).getImm();
115 switch (Imm) {
116 default: llvm_unreachable("Invalid xopcc argument!");
117 case 0: O << "lt"; break;
118 case 1: O << "le"; break;
119 case 2: O << "gt"; break;
120 case 3: O << "ge"; break;
121 case 4: O << "eq"; break;
122 case 5: O << "neq"; break;
123 case 6: O << "false"; break;
124 case 7: O << "true"; break;
125 }
126 }
127
printRoundingControl(const MCInst * MI,unsigned Op,raw_ostream & O)128 void X86ATTInstPrinter::printRoundingControl(const MCInst *MI, unsigned Op,
129 raw_ostream &O) {
130 int64_t Imm = MI->getOperand(Op).getImm() & 0x3;
131 switch (Imm) {
132 case 0: O << "{rn-sae}"; break;
133 case 1: O << "{rd-sae}"; break;
134 case 2: O << "{ru-sae}"; break;
135 case 3: O << "{rz-sae}"; break;
136 }
137 }
138 /// printPCRelImm - This is used to print an immediate value that ends up
139 /// being encoded as a pc-relative value (e.g. for jumps and calls). These
140 /// print slightly differently than normal immediates. For example, a $ is not
141 /// emitted.
printPCRelImm(const MCInst * MI,unsigned OpNo,raw_ostream & O)142 void X86ATTInstPrinter::printPCRelImm(const MCInst *MI, unsigned OpNo,
143 raw_ostream &O) {
144 const MCOperand &Op = MI->getOperand(OpNo);
145 if (Op.isImm())
146 O << formatImm(Op.getImm());
147 else {
148 assert(Op.isExpr() && "unknown pcrel immediate operand");
149 // If a symbolic branch target was added as a constant expression then print
150 // that address in hex.
151 const MCConstantExpr *BranchTarget = dyn_cast<MCConstantExpr>(Op.getExpr());
152 int64_t Address;
153 if (BranchTarget && BranchTarget->evaluateAsAbsolute(Address)) {
154 O << formatHex((uint64_t)Address);
155 } else {
156 // Otherwise, just print the expression.
157 Op.getExpr()->print(O, &MAI);
158 }
159 }
160 }
161
printOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O)162 void X86ATTInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
163 raw_ostream &O) {
164 const MCOperand &Op = MI->getOperand(OpNo);
165 if (Op.isReg()) {
166 printRegName(O, Op.getReg());
167 } else if (Op.isImm()) {
168 // Print immediates as signed values.
169 int64_t Imm = Op.getImm();
170 O << markup("<imm:") << '$' << formatImm(Imm) << markup(">");
171
172 // TODO: This should be in a helper function in the base class, so it can
173 // be used by other printers.
174
175 // If there are no instruction-specific comments, add a comment clarifying
176 // the hex value of the immediate operand when it isn't in the range
177 // [-256,255].
178 if (CommentStream && !HasCustomInstComment && (Imm > 255 || Imm < -256)) {
179 // Don't print unnecessary hex sign bits.
180 if (Imm == (int16_t)(Imm))
181 *CommentStream << format("imm = 0x%" PRIX16 "\n", (uint16_t)Imm);
182 else if (Imm == (int32_t)(Imm))
183 *CommentStream << format("imm = 0x%" PRIX32 "\n", (uint32_t)Imm);
184 else
185 *CommentStream << format("imm = 0x%" PRIX64 "\n", (uint64_t)Imm);
186 }
187 } else {
188 assert(Op.isExpr() && "unknown operand kind in printOperand");
189 O << markup("<imm:") << '$';
190 Op.getExpr()->print(O, &MAI);
191 O << markup(">");
192 }
193 }
194
printMemReference(const MCInst * MI,unsigned Op,raw_ostream & O)195 void X86ATTInstPrinter::printMemReference(const MCInst *MI, unsigned Op,
196 raw_ostream &O) {
197 const MCOperand &BaseReg = MI->getOperand(Op + X86::AddrBaseReg);
198 const MCOperand &IndexReg = MI->getOperand(Op + X86::AddrIndexReg);
199 const MCOperand &DispSpec = MI->getOperand(Op + X86::AddrDisp);
200 const MCOperand &SegReg = MI->getOperand(Op + X86::AddrSegmentReg);
201
202 O << markup("<mem:");
203
204 // If this has a segment register, print it.
205 if (SegReg.getReg()) {
206 printOperand(MI, Op + X86::AddrSegmentReg, O);
207 O << ':';
208 }
209
210 if (DispSpec.isImm()) {
211 int64_t DispVal = DispSpec.getImm();
212 if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
213 O << formatImm(DispVal);
214 } else {
215 assert(DispSpec.isExpr() && "non-immediate displacement for LEA?");
216 DispSpec.getExpr()->print(O, &MAI);
217 }
218
219 if (IndexReg.getReg() || BaseReg.getReg()) {
220 O << '(';
221 if (BaseReg.getReg())
222 printOperand(MI, Op + X86::AddrBaseReg, O);
223
224 if (IndexReg.getReg()) {
225 O << ',';
226 printOperand(MI, Op + X86::AddrIndexReg, O);
227 unsigned ScaleVal = MI->getOperand(Op + X86::AddrScaleAmt).getImm();
228 if (ScaleVal != 1) {
229 O << ',' << markup("<imm:") << ScaleVal // never printed in hex.
230 << markup(">");
231 }
232 }
233 O << ')';
234 }
235
236 O << markup(">");
237 }
238
printSrcIdx(const MCInst * MI,unsigned Op,raw_ostream & O)239 void X86ATTInstPrinter::printSrcIdx(const MCInst *MI, unsigned Op,
240 raw_ostream &O) {
241 const MCOperand &SegReg = MI->getOperand(Op + 1);
242
243 O << markup("<mem:");
244
245 // If this has a segment register, print it.
246 if (SegReg.getReg()) {
247 printOperand(MI, Op + 1, O);
248 O << ':';
249 }
250
251 O << "(";
252 printOperand(MI, Op, O);
253 O << ")";
254
255 O << markup(">");
256 }
257
printDstIdx(const MCInst * MI,unsigned Op,raw_ostream & O)258 void X86ATTInstPrinter::printDstIdx(const MCInst *MI, unsigned Op,
259 raw_ostream &O) {
260 O << markup("<mem:");
261
262 O << "%es:(";
263 printOperand(MI, Op, O);
264 O << ")";
265
266 O << markup(">");
267 }
268
printMemOffset(const MCInst * MI,unsigned Op,raw_ostream & O)269 void X86ATTInstPrinter::printMemOffset(const MCInst *MI, unsigned Op,
270 raw_ostream &O) {
271 const MCOperand &DispSpec = MI->getOperand(Op);
272 const MCOperand &SegReg = MI->getOperand(Op + 1);
273
274 O << markup("<mem:");
275
276 // If this has a segment register, print it.
277 if (SegReg.getReg()) {
278 printOperand(MI, Op + 1, O);
279 O << ':';
280 }
281
282 if (DispSpec.isImm()) {
283 O << formatImm(DispSpec.getImm());
284 } else {
285 assert(DispSpec.isExpr() && "non-immediate displacement?");
286 DispSpec.getExpr()->print(O, &MAI);
287 }
288
289 O << markup(">");
290 }
291
printU8Imm(const MCInst * MI,unsigned Op,raw_ostream & O)292 void X86ATTInstPrinter::printU8Imm(const MCInst *MI, unsigned Op,
293 raw_ostream &O) {
294 O << markup("<imm:") << '$' << formatImm(MI->getOperand(Op).getImm() & 0xff)
295 << markup(">");
296 }
297