1 //===- lib/MC/MCStreamer.cpp - Streaming Machine Code Output --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/MC/MCAsmInfo.h"
11 #include "llvm/MC/MCContext.h"
12 #include "llvm/MC/MCStreamer.h"
13 #include "llvm/MC/MCExpr.h"
14 #include "llvm/MC/MCObjectWriter.h"
15 #include "llvm/MC/MCSymbol.h"
16 #include "llvm/Support/ErrorHandling.h"
17 #include "llvm/Support/raw_ostream.h"
18 #include "llvm/ADT/SmallString.h"
19 #include "llvm/ADT/Twine.h"
23 MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx) {
24 const MCSection *section = NULL;
25 SectionStack.push_back(std::make_pair(section, section));
28 MCStreamer::~MCStreamer() {
31 raw_ostream &MCStreamer::GetCommentOS() {
32 // By default, discard comments.
36 void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
37 const MCSymbol *Label, int PointerSize) {
38 // emit the sequence to set the address
39 EmitIntValue(dwarf::DW_LNS_extended_op, 1);
40 EmitULEB128IntValue(PointerSize + 1);
41 EmitIntValue(dwarf::DW_LNE_set_address, 1);
42 EmitSymbolValue(Label, PointerSize);
44 // emit the sequence for the LineDelta (from 1) and a zero address delta.
45 MCDwarfLineAddr::Emit(this, LineDelta, 0);
48 /// EmitIntValue - Special case of EmitValue that avoids the client having to
49 /// pass in a MCExpr for constant integers.
50 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size,
52 assert(Size <= 8 && "Invalid size");
53 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
56 // FIXME: Endianness assumption.
57 for (unsigned i = 0; i != Size; ++i)
58 buf[i] = uint8_t(Value >> (i * 8));
59 EmitBytes(StringRef(buf, Size), AddrSpace);
62 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
63 /// client having to pass in a MCExpr for constant integers.
64 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) {
66 raw_svector_ostream OSE(Tmp);
67 MCObjectWriter::EncodeULEB128(Value, OSE);
68 EmitBytes(OSE.str(), AddrSpace);
71 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
72 /// client having to pass in a MCExpr for constant integers.
73 void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) {
75 raw_svector_ostream OSE(Tmp);
76 MCObjectWriter::EncodeSLEB128(Value, OSE);
77 EmitBytes(OSE.str(), AddrSpace);
80 void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size,
82 if (getContext().getAsmInfo().hasAggressiveSymbolFolding()) {
83 EmitValue(Value, Size, AddrSpace);
86 MCSymbol *ABS = getContext().CreateTempSymbol();
87 EmitAssignment(ABS, Value);
88 EmitSymbolValue(ABS, Size, AddrSpace);
92 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
94 EmitValueImpl(Value, Size, false, AddrSpace);
97 void MCStreamer::EmitPCRelValue(const MCExpr *Value, unsigned Size,
99 EmitValueImpl(Value, Size, true, AddrSpace);
102 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
103 bool isPCRel, unsigned AddrSpace) {
104 EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size, isPCRel,
108 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
109 unsigned AddrSpace) {
110 EmitSymbolValue(Sym, Size, false, AddrSpace);
113 void MCStreamer::EmitPCRelSymbolValue(const MCSymbol *Sym, unsigned Size,
114 unsigned AddrSpace) {
115 EmitSymbolValue(Sym, Size, true, AddrSpace);
118 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
119 report_fatal_error("unsupported directive in streamer");
122 /// EmitFill - Emit NumBytes bytes worth of the value specified by
123 /// FillValue. This implements directives such as '.space'.
124 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
125 unsigned AddrSpace) {
126 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
127 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
128 EmitValue(E, 1, AddrSpace);
131 bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
132 StringRef Filename) {
133 return getContext().GetDwarfFile(Filename, FileNo) == 0;
136 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
137 unsigned Column, unsigned Flags,
139 unsigned Discriminator,
140 StringRef FileName) {
141 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
145 MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
146 if (FrameInfos.empty())
148 return &FrameInfos.back();
151 void MCStreamer::EnsureValidFrame() {
152 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
153 if (!CurFrame || CurFrame->End)
154 report_fatal_error("No open frame");
157 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
158 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
159 assert(getCurrentSection() && "Cannot emit before setting section!");
160 Symbol->setSection(*getCurrentSection());
162 StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix();
163 if (!Symbol->getName().startswith(Prefix))
164 LastNonPrivate = Symbol;
167 void MCStreamer::EmitCFIStartProc() {
168 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
169 if (CurFrame && !CurFrame->End)
170 report_fatal_error("Starting a frame before finishing the previous one!");
171 MCDwarfFrameInfo Frame;
172 Frame.Begin = getContext().CreateTempSymbol();
173 Frame.Function = LastNonPrivate;
174 EmitLabel(Frame.Begin);
175 FrameInfos.push_back(Frame);
178 void MCStreamer::EmitCFIEndProc() {
180 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
181 CurFrame->End = getContext().CreateTempSymbol();
182 EmitLabel(CurFrame->End);
185 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
187 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
188 MCSymbol *Label = getContext().CreateTempSymbol();
190 MachineLocation Dest(MachineLocation::VirtualFP);
191 MachineLocation Source(Register, -Offset);
192 MCCFIInstruction Instruction(Label, Dest, Source);
193 CurFrame->Instructions.push_back(Instruction);
196 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
198 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
199 MCSymbol *Label = getContext().CreateTempSymbol();
201 MachineLocation Dest(MachineLocation::VirtualFP);
202 MachineLocation Source(MachineLocation::VirtualFP, -Offset);
203 MCCFIInstruction Instruction(Label, Dest, Source);
204 CurFrame->Instructions.push_back(Instruction);
207 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
209 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
210 MCSymbol *Label = getContext().CreateTempSymbol();
212 MachineLocation Dest(MachineLocation::VirtualFP);
213 MachineLocation Source(MachineLocation::VirtualFP, Adjustment);
214 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source);
215 CurFrame->Instructions.push_back(Instruction);
218 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
220 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
221 MCSymbol *Label = getContext().CreateTempSymbol();
223 MachineLocation Dest(Register);
224 MachineLocation Source(MachineLocation::VirtualFP);
225 MCCFIInstruction Instruction(Label, Dest, Source);
226 CurFrame->Instructions.push_back(Instruction);
229 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
231 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
232 MCSymbol *Label = getContext().CreateTempSymbol();
234 MachineLocation Dest(Register, Offset);
235 MachineLocation Source(Register, Offset);
236 MCCFIInstruction Instruction(Label, Dest, Source);
237 CurFrame->Instructions.push_back(Instruction);
240 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
242 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
243 MCSymbol *Label = getContext().CreateTempSymbol();
245 MachineLocation Dest(Register, Offset);
246 MachineLocation Source(Register, Offset);
247 MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source);
248 CurFrame->Instructions.push_back(Instruction);
251 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
254 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
255 CurFrame->Personality = Sym;
256 CurFrame->PersonalityEncoding = Encoding;
259 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
261 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
262 CurFrame->Lsda = Sym;
263 CurFrame->LsdaEncoding = Encoding;
266 void MCStreamer::EmitCFIRememberState() {
268 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
269 MCSymbol *Label = getContext().CreateTempSymbol();
271 MCCFIInstruction Instruction(MCCFIInstruction::Remember, Label);
272 CurFrame->Instructions.push_back(Instruction);
275 void MCStreamer::EmitCFIRestoreState() {
276 // FIXME: Error if there is no matching cfi_remember_state.
278 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
279 MCSymbol *Label = getContext().CreateTempSymbol();
281 MCCFIInstruction Instruction(MCCFIInstruction::Restore, Label);
282 CurFrame->Instructions.push_back(Instruction);
285 void MCStreamer::EmitCFISameValue(int64_t Register) {
287 MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
288 MCSymbol *Label = getContext().CreateTempSymbol();
290 MCCFIInstruction Instruction(MCCFIInstruction::SameValue, Label, Register);
291 CurFrame->Instructions.push_back(Instruction);
294 void MCStreamer::EmitFnStart() {
295 errs() << "Not implemented yet\n";
299 void MCStreamer::EmitFnEnd() {
300 errs() << "Not implemented yet\n";
304 void MCStreamer::EmitCantUnwind() {
305 errs() << "Not implemented yet\n";
309 void MCStreamer::EmitHandlerData() {
310 errs() << "Not implemented yet\n";
314 void MCStreamer::EmitPersonality(const MCSymbol *Personality) {
315 errs() << "Not implemented yet\n";
319 void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
320 errs() << "Not implemented yet\n";
324 void MCStreamer::EmitPad(int64_t Offset) {
325 errs() << "Not implemented yet\n";
329 void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) {
330 errs() << "Not implemented yet\n";
334 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
335 /// the specified string in the output .s file. This capability is
336 /// indicated by the hasRawTextSupport() predicate.
337 void MCStreamer::EmitRawText(StringRef String) {
338 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
339 " something must not be fully mc'ized\n";
343 void MCStreamer::EmitRawText(const Twine &T) {
344 SmallString<128> Str;
346 EmitRawText(Str.str());