MCStreamer.cpp revision 32a006e606742b1c5401e49607e33717bb5441f0
1a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar//===- lib/MC/MCStreamer.cpp - Streaming Machine Code Output --------------===// 2a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar// 3a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar// The LLVM Compiler Infrastructure 4a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar// 5a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar// This file is distributed under the University of Illinois Open Source 6a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar// License. See LICENSE.TXT for details. 7a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar// 8a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar//===----------------------------------------------------------------------===// 9a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar 10af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola#include "llvm/MC/MCContext.h" 11a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar#include "llvm/MC/MCStreamer.h" 12ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner#include "llvm/MC/MCExpr.h" 13c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#include "llvm/MC/MCObjectWriter.h" 14484291c27319668ad99cb87def000254357736fbRafael Espindola#include "llvm/Support/ErrorHandling.h" 15d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner#include "llvm/Support/raw_ostream.h" 1658bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner#include "llvm/ADT/SmallString.h" 1758bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner#include "llvm/ADT/Twine.h" 183580dea910d622f2a6dbb72e97f5f7d0ef979542Chris Lattner#include <cstdlib> 19a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbarusing namespace llvm; 20a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar 211674b0b0e4972b844833f253286cbf99a6e99d6eBenjamin KramerMCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx), CurSection(0), 221674b0b0e4972b844833f253286cbf99a6e99d6eBenjamin Kramer PrevSection(0) { 23a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar} 24a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar 25a11af531ec48ad84f790b9511f003ac5c934a999Daniel DunbarMCStreamer::~MCStreamer() { 26a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar} 27ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner 28d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattnerraw_ostream &MCStreamer::GetCommentOS() { 29d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner // By default, discard comments. 30d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner return nulls(); 31d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner} 32d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner 3332a006e606742b1c5401e49607e33717bb5441f0Rafael Espindolavoid MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta, 3432a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola const MCSymbol *Label, int PointerSize) { 3532a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola // emit the sequence to set the address 3632a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola EmitIntValue(dwarf::DW_LNS_extended_op, 1); 3732a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola EmitULEB128IntValue(PointerSize + 1); 3832a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola EmitIntValue(dwarf::DW_LNE_set_address, 1); 3932a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola EmitSymbolValue(Label, PointerSize); 4032a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola 4132a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola // emit the sequence for the LineDelta (from 1) and a zero address delta. 4232a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola MCDwarfLineAddr::Emit(this, LineDelta, 0); 4332a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola} 44d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner 4532ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner/// EmitIntValue - Special case of EmitValue that avoids the client having to 4632ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner/// pass in a MCExpr for constant integers. 4732ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattnervoid MCStreamer::EmitIntValue(uint64_t Value, unsigned Size, 4832ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner unsigned AddrSpace) { 4932ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace); 5032ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner} 5132ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner 523ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the 533ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola/// client having to pass in a MCExpr for constant integers. 543ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindolavoid MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) { 553ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola EmitULEB128Value(MCConstantExpr::Create(Value, getContext()), AddrSpace); 56c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 57c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 583ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola/// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the 593ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola/// client having to pass in a MCExpr for constant integers. 603ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindolavoid MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) { 613ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola EmitSLEB128Value(MCConstantExpr::Create(Value, getContext()), AddrSpace); 62c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 63c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 646cde3e6e993126df756e3be5b9ef43540b904644Chris Lattnervoid MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size, 656cde3e6e993126df756e3be5b9ef43540b904644Chris Lattner unsigned AddrSpace) { 666cde3e6e993126df756e3be5b9ef43540b904644Chris Lattner EmitValue(MCSymbolRefExpr::Create(Sym, getContext()), Size, AddrSpace); 676cde3e6e993126df756e3be5b9ef43540b904644Chris Lattner} 686cde3e6e993126df756e3be5b9ef43540b904644Chris Lattner 693e03211625bba5bbb70a193c140ebf4dd8388bb7Rafael Espindolavoid MCStreamer::EmitGPRel32Value(const MCExpr *Value) { 703e03211625bba5bbb70a193c140ebf4dd8388bb7Rafael Espindola report_fatal_error("unsupported directive in streamer"); 713e03211625bba5bbb70a193c140ebf4dd8388bb7Rafael Espindola} 723e03211625bba5bbb70a193c140ebf4dd8388bb7Rafael Espindola 73ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner/// EmitFill - Emit NumBytes bytes worth of the value specified by 74ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner/// FillValue. This implements directives such as '.space'. 75aaec205b87637cd0d59d4f11630db603686eb73dChris Lattnervoid MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue, 76aaec205b87637cd0d59d4f11630db603686eb73dChris Lattner unsigned AddrSpace) { 77ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner const MCExpr *E = MCConstantExpr::Create(FillValue, getContext()); 78ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner for (uint64_t i = 0, e = NumBytes; i != e; ++i) 79aaec205b87637cd0d59d4f11630db603686eb73dChris Lattner EmitValue(E, 1, AddrSpace); 80ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner} 8191bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner 82af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindolabool MCStreamer::EmitDwarfFileDirective(unsigned FileNo, 83af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola StringRef Filename) { 84af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola return getContext().GetDwarfFile(Filename, FileNo) == 0; 85af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola} 86af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola 87af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindolavoid MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line, 88af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola unsigned Column, unsigned Flags, 89af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola unsigned Isa, 90af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola unsigned Discriminator) { 91af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa, 92af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola Discriminator); 93af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola} 94af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola 95cdfecc8759941c2996214070478d30084b79d463Rafael Espindolabool MCStreamer::EmitCFIStartProc() { 96cdfecc8759941c2996214070478d30084b79d463Rafael Espindola return false; 97cdfecc8759941c2996214070478d30084b79d463Rafael Espindola} 98cdfecc8759941c2996214070478d30084b79d463Rafael Espindola 99cdfecc8759941c2996214070478d30084b79d463Rafael Espindolabool MCStreamer::EmitCFIEndProc() { 100cdfecc8759941c2996214070478d30084b79d463Rafael Espindola return false; 101cdfecc8759941c2996214070478d30084b79d463Rafael Espindola} 102cdfecc8759941c2996214070478d30084b79d463Rafael Espindola 103cdfecc8759941c2996214070478d30084b79d463Rafael Espindolabool MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) { 104cdfecc8759941c2996214070478d30084b79d463Rafael Espindola return false; 105cdfecc8759941c2996214070478d30084b79d463Rafael Espindola} 106cdfecc8759941c2996214070478d30084b79d463Rafael Espindola 107cdfecc8759941c2996214070478d30084b79d463Rafael Espindolabool MCStreamer::EmitCFIDefCfaRegister(int64_t Register) { 108cdfecc8759941c2996214070478d30084b79d463Rafael Espindola return false; 109cdfecc8759941c2996214070478d30084b79d463Rafael Espindola} 110cdfecc8759941c2996214070478d30084b79d463Rafael Espindola 111cdfecc8759941c2996214070478d30084b79d463Rafael Espindolabool MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) { 112cdfecc8759941c2996214070478d30084b79d463Rafael Espindola return false; 113cdfecc8759941c2996214070478d30084b79d463Rafael Espindola} 114cdfecc8759941c2996214070478d30084b79d463Rafael Espindola 115cdfecc8759941c2996214070478d30084b79d463Rafael Espindolabool MCStreamer::EmitCFIPersonality(const MCSymbol *Sym) { 116cdfecc8759941c2996214070478d30084b79d463Rafael Espindola return false; 117cdfecc8759941c2996214070478d30084b79d463Rafael Espindola} 118cdfecc8759941c2996214070478d30084b79d463Rafael Espindola 119cdfecc8759941c2996214070478d30084b79d463Rafael Espindolabool MCStreamer::EmitCFILsda(const MCSymbol *Sym) { 120cdfecc8759941c2996214070478d30084b79d463Rafael Espindola return false; 121cdfecc8759941c2996214070478d30084b79d463Rafael Espindola} 122cdfecc8759941c2996214070478d30084b79d463Rafael Espindola 123ab3b3651add0915a5a051b177029ad117a877f52Matt Fleming/// EmitRawText - If this file is backed by an assembly streamer, this dumps 12491bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner/// the specified string in the output .s file. This capability is 12591bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner/// indicated by the hasRawTextSupport() predicate. 12691bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattnervoid MCStreamer::EmitRawText(StringRef String) { 12791bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner errs() << "EmitRawText called on an MCStreamer that doesn't support it, " 12891bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner " something must not be fully mc'ized\n"; 12991bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner abort(); 13091bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner} 13158bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner 13258bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattnervoid MCStreamer::EmitRawText(const Twine &T) { 13358bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner SmallString<128> Str; 13458bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner T.toVector(Str); 13558bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner EmitRawText(Str.str()); 13658bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner} 137