MCStreamer.cpp revision dea914bed9fb1d5c08e944557989ccddb6849000
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 100bbe0b440ee2cef47dcb7b281825eb70341c16ddRafael Espindola#include "llvm/MC/MCAsmInfo.h" 11af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola#include "llvm/MC/MCContext.h" 12a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar#include "llvm/MC/MCStreamer.h" 13ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner#include "llvm/MC/MCExpr.h" 14c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#include "llvm/MC/MCObjectWriter.h" 15484291c27319668ad99cb87def000254357736fbRafael Espindola#include "llvm/Support/ErrorHandling.h" 16d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner#include "llvm/Support/raw_ostream.h" 1758bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner#include "llvm/ADT/SmallString.h" 1858bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner#include "llvm/ADT/Twine.h" 193580dea910d622f2a6dbb72e97f5f7d0ef979542Chris Lattner#include <cstdlib> 20a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbarusing namespace llvm; 21a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar 221674b0b0e4972b844833f253286cbf99a6e99d6eBenjamin KramerMCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx), CurSection(0), 231674b0b0e4972b844833f253286cbf99a6e99d6eBenjamin Kramer PrevSection(0) { 24a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar} 25a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar 26a11af531ec48ad84f790b9511f003ac5c934a999Daniel DunbarMCStreamer::~MCStreamer() { 27a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar} 28ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner 29d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattnerraw_ostream &MCStreamer::GetCommentOS() { 30d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner // By default, discard comments. 31d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner return nulls(); 32d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner} 33d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner 3432a006e606742b1c5401e49607e33717bb5441f0Rafael Espindolavoid MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta, 3532a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola const MCSymbol *Label, int PointerSize) { 3632a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola // emit the sequence to set the address 3732a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola EmitIntValue(dwarf::DW_LNS_extended_op, 1); 3832a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola EmitULEB128IntValue(PointerSize + 1); 3932a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola EmitIntValue(dwarf::DW_LNE_set_address, 1); 4032a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola EmitSymbolValue(Label, PointerSize); 4132a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola 4232a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola // emit the sequence for the LineDelta (from 1) and a zero address delta. 4332a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola MCDwarfLineAddr::Emit(this, LineDelta, 0); 4432a006e606742b1c5401e49607e33717bb5441f0Rafael Espindola} 45d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner 4632ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner/// EmitIntValue - Special case of EmitValue that avoids the client having to 4732ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner/// pass in a MCExpr for constant integers. 4832ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattnervoid MCStreamer::EmitIntValue(uint64_t Value, unsigned Size, 4932ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner unsigned AddrSpace) { 50dea914bed9fb1d5c08e944557989ccddb6849000Devang Patel assert(Size <= 8 && "Invalid size"); 51dea914bed9fb1d5c08e944557989ccddb6849000Devang Patel assert(!(Size == 1 && (signed)Value > 255) && "Invalid size"); 522df042cb32ecb8d2e1d499dfa27d5074c8b40e13Rafael Espindola char buf[8]; 532df042cb32ecb8d2e1d499dfa27d5074c8b40e13Rafael Espindola // FIXME: Endianness assumption. 542df042cb32ecb8d2e1d499dfa27d5074c8b40e13Rafael Espindola for (unsigned i = 0; i != Size; ++i) 552df042cb32ecb8d2e1d499dfa27d5074c8b40e13Rafael Espindola buf[i] = uint8_t(Value >> (i * 8)); 562df042cb32ecb8d2e1d499dfa27d5074c8b40e13Rafael Espindola EmitBytes(StringRef(buf, Size), AddrSpace); 5732ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner} 5832ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner 593ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the 603ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola/// client having to pass in a MCExpr for constant integers. 613ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindolavoid MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) { 62660b5fc4d019bf22fbe14dfb81c5b59444fa3506Rafael Espindola SmallString<32> Tmp; 63660b5fc4d019bf22fbe14dfb81c5b59444fa3506Rafael Espindola raw_svector_ostream OSE(Tmp); 64660b5fc4d019bf22fbe14dfb81c5b59444fa3506Rafael Espindola MCObjectWriter::EncodeULEB128(Value, OSE); 65660b5fc4d019bf22fbe14dfb81c5b59444fa3506Rafael Espindola EmitBytes(OSE.str(), AddrSpace); 66c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 67c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 683ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola/// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the 693ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindola/// client having to pass in a MCExpr for constant integers. 703ff57094a7d176a759ddb1e1668489d89064f56cRafael Espindolavoid MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) { 71660b5fc4d019bf22fbe14dfb81c5b59444fa3506Rafael Espindola SmallString<32> Tmp; 72660b5fc4d019bf22fbe14dfb81c5b59444fa3506Rafael Espindola raw_svector_ostream OSE(Tmp); 73660b5fc4d019bf22fbe14dfb81c5b59444fa3506Rafael Espindola MCObjectWriter::EncodeSLEB128(Value, OSE); 74660b5fc4d019bf22fbe14dfb81c5b59444fa3506Rafael Espindola EmitBytes(OSE.str(), AddrSpace); 75c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 76c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 770bbe0b440ee2cef47dcb7b281825eb70341c16ddRafael Espindolavoid MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size, 780bbe0b440ee2cef47dcb7b281825eb70341c16ddRafael Espindola unsigned AddrSpace) { 790bbe0b440ee2cef47dcb7b281825eb70341c16ddRafael Espindola if (!getContext().getAsmInfo().needsSetToChangeDiffSize()) { 800bbe0b440ee2cef47dcb7b281825eb70341c16ddRafael Espindola EmitValue(Value, Size, AddrSpace); 810bbe0b440ee2cef47dcb7b281825eb70341c16ddRafael Espindola return; 820bbe0b440ee2cef47dcb7b281825eb70341c16ddRafael Espindola } 830bbe0b440ee2cef47dcb7b281825eb70341c16ddRafael Espindola MCSymbol *ABS = getContext().CreateTempSymbol(); 840bbe0b440ee2cef47dcb7b281825eb70341c16ddRafael Espindola EmitAssignment(ABS, Value); 850bbe0b440ee2cef47dcb7b281825eb70341c16ddRafael Espindola EmitSymbolValue(ABS, Size, AddrSpace); 860bbe0b440ee2cef47dcb7b281825eb70341c16ddRafael Espindola} 870bbe0b440ee2cef47dcb7b281825eb70341c16ddRafael Espindola 886cde3e6e993126df756e3be5b9ef43540b904644Chris Lattnervoid MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size, 896cde3e6e993126df756e3be5b9ef43540b904644Chris Lattner unsigned AddrSpace) { 906cde3e6e993126df756e3be5b9ef43540b904644Chris Lattner EmitValue(MCSymbolRefExpr::Create(Sym, getContext()), Size, AddrSpace); 916cde3e6e993126df756e3be5b9ef43540b904644Chris Lattner} 926cde3e6e993126df756e3be5b9ef43540b904644Chris Lattner 933e03211625bba5bbb70a193c140ebf4dd8388bb7Rafael Espindolavoid MCStreamer::EmitGPRel32Value(const MCExpr *Value) { 943e03211625bba5bbb70a193c140ebf4dd8388bb7Rafael Espindola report_fatal_error("unsupported directive in streamer"); 953e03211625bba5bbb70a193c140ebf4dd8388bb7Rafael Espindola} 963e03211625bba5bbb70a193c140ebf4dd8388bb7Rafael Espindola 97ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner/// EmitFill - Emit NumBytes bytes worth of the value specified by 98ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner/// FillValue. This implements directives such as '.space'. 99aaec205b87637cd0d59d4f11630db603686eb73dChris Lattnervoid MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue, 100aaec205b87637cd0d59d4f11630db603686eb73dChris Lattner unsigned AddrSpace) { 101ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner const MCExpr *E = MCConstantExpr::Create(FillValue, getContext()); 102ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner for (uint64_t i = 0, e = NumBytes; i != e; ++i) 103aaec205b87637cd0d59d4f11630db603686eb73dChris Lattner EmitValue(E, 1, AddrSpace); 104ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner} 10591bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner 106af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindolabool MCStreamer::EmitDwarfFileDirective(unsigned FileNo, 107af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola StringRef Filename) { 108af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola return getContext().GetDwarfFile(Filename, FileNo) == 0; 109af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola} 110af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola 111af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindolavoid MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line, 112af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola unsigned Column, unsigned Flags, 113af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola unsigned Isa, 114af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola unsigned Discriminator) { 115af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa, 116af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola Discriminator); 117af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola} 118af6b5808756d6ce335df9eb158efa33894b401c4Rafael Espindola 119cdfecc8759941c2996214070478d30084b79d463Rafael Espindolabool MCStreamer::EmitCFIStartProc() { 120cdfecc8759941c2996214070478d30084b79d463Rafael Espindola return false; 121cdfecc8759941c2996214070478d30084b79d463Rafael Espindola} 122cdfecc8759941c2996214070478d30084b79d463Rafael Espindola 123cdfecc8759941c2996214070478d30084b79d463Rafael Espindolabool MCStreamer::EmitCFIEndProc() { 124cdfecc8759941c2996214070478d30084b79d463Rafael Espindola return false; 125cdfecc8759941c2996214070478d30084b79d463Rafael Espindola} 126cdfecc8759941c2996214070478d30084b79d463Rafael Espindola 127cdfecc8759941c2996214070478d30084b79d463Rafael Espindolabool MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) { 128cdfecc8759941c2996214070478d30084b79d463Rafael Espindola return false; 129cdfecc8759941c2996214070478d30084b79d463Rafael Espindola} 130cdfecc8759941c2996214070478d30084b79d463Rafael Espindola 131cdfecc8759941c2996214070478d30084b79d463Rafael Espindolabool MCStreamer::EmitCFIDefCfaRegister(int64_t Register) { 132cdfecc8759941c2996214070478d30084b79d463Rafael Espindola return false; 133cdfecc8759941c2996214070478d30084b79d463Rafael Espindola} 134cdfecc8759941c2996214070478d30084b79d463Rafael Espindola 135cdfecc8759941c2996214070478d30084b79d463Rafael Espindolabool MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) { 136cdfecc8759941c2996214070478d30084b79d463Rafael Espindola return false; 137cdfecc8759941c2996214070478d30084b79d463Rafael Espindola} 138cdfecc8759941c2996214070478d30084b79d463Rafael Espindola 139cdfecc8759941c2996214070478d30084b79d463Rafael Espindolabool MCStreamer::EmitCFIPersonality(const MCSymbol *Sym) { 140cdfecc8759941c2996214070478d30084b79d463Rafael Espindola return false; 141cdfecc8759941c2996214070478d30084b79d463Rafael Espindola} 142cdfecc8759941c2996214070478d30084b79d463Rafael Espindola 143cdfecc8759941c2996214070478d30084b79d463Rafael Espindolabool MCStreamer::EmitCFILsda(const MCSymbol *Sym) { 144cdfecc8759941c2996214070478d30084b79d463Rafael Espindola return false; 145cdfecc8759941c2996214070478d30084b79d463Rafael Espindola} 146cdfecc8759941c2996214070478d30084b79d463Rafael Espindola 147ab3b3651add0915a5a051b177029ad117a877f52Matt Fleming/// EmitRawText - If this file is backed by an assembly streamer, this dumps 14891bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner/// the specified string in the output .s file. This capability is 14991bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner/// indicated by the hasRawTextSupport() predicate. 15091bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattnervoid MCStreamer::EmitRawText(StringRef String) { 15191bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner errs() << "EmitRawText called on an MCStreamer that doesn't support it, " 15291bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner " something must not be fully mc'ized\n"; 15391bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner abort(); 15491bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner} 15558bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner 15658bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattnervoid MCStreamer::EmitRawText(const Twine &T) { 15758bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner SmallString<128> Str; 15858bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner T.toVector(Str); 15958bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner EmitRawText(Str.str()); 16058bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner} 161