MCStreamer.cpp revision c095793b4ab027181605c79c9808df12afe45d63
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 10a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar#include "llvm/MC/MCStreamer.h" 11ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner#include "llvm/MC/MCExpr.h" 12c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby#include "llvm/MC/MCObjectWriter.h" 13d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner#include "llvm/Support/raw_ostream.h" 1458bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner#include "llvm/ADT/SmallString.h" 1558bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner#include "llvm/ADT/Twine.h" 163580dea910d622f2a6dbb72e97f5f7d0ef979542Chris Lattner#include <cstdlib> 17a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbarusing namespace llvm; 18a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar 191674b0b0e4972b844833f253286cbf99a6e99d6eBenjamin KramerMCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx), CurSection(0), 201674b0b0e4972b844833f253286cbf99a6e99d6eBenjamin Kramer PrevSection(0) { 21a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar} 22a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar 23a11af531ec48ad84f790b9511f003ac5c934a999Daniel DunbarMCStreamer::~MCStreamer() { 24a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar} 25ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner 26d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattnerraw_ostream &MCStreamer::GetCommentOS() { 27d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner // By default, discard comments. 28d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner return nulls(); 29d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner} 30d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner 31d79d9dce47d505369662ae5111dba24f9ccdef68Chris Lattner 3232ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner/// EmitIntValue - Special case of EmitValue that avoids the client having to 3332ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner/// pass in a MCExpr for constant integers. 3432ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattnervoid MCStreamer::EmitIntValue(uint64_t Value, unsigned Size, 3532ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner unsigned AddrSpace) { 3632ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace); 3732ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner} 3832ae3fe0ba469240753e2342e36485f7c9acfb5cChris Lattner 39c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// EmitULEB128Value - Special case of EmitValue that emits a ULEB128 of the 40c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// Value as the sequence of ULEB128 encoded bytes. 41c095793b4ab027181605c79c9808df12afe45d63Kevin Enderbyvoid MCStreamer::EmitULEB128Value(uint64_t Value, unsigned AddrSpace) { 42c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby SmallString<32> Tmp; 43c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby raw_svector_ostream OS(Tmp); 44c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCObjectWriter::EncodeULEB128(Value, OS); 45c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby EmitBytes(OS.str(), AddrSpace); 46c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 47c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 48c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// EmitSLEB128Value - Special case of EmitValue that emits a SLEB128 of the 49c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby// Value as the sequence of ULEB128 encoded bytes. 50c095793b4ab027181605c79c9808df12afe45d63Kevin Enderbyvoid MCStreamer::EmitSLEB128Value(int64_t Value, unsigned AddrSpace) { 51c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby SmallString<32> Tmp; 52c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby raw_svector_ostream OS(Tmp); 53c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby MCObjectWriter::EncodeSLEB128(Value, OS); 54c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby EmitBytes(OS.str(), AddrSpace); 55c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby} 56c095793b4ab027181605c79c9808df12afe45d63Kevin Enderby 576cde3e6e993126df756e3be5b9ef43540b904644Chris Lattnervoid MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size, 586cde3e6e993126df756e3be5b9ef43540b904644Chris Lattner unsigned AddrSpace) { 596cde3e6e993126df756e3be5b9ef43540b904644Chris Lattner EmitValue(MCSymbolRefExpr::Create(Sym, getContext()), Size, AddrSpace); 606cde3e6e993126df756e3be5b9ef43540b904644Chris Lattner} 616cde3e6e993126df756e3be5b9ef43540b904644Chris Lattner 62ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner/// EmitFill - Emit NumBytes bytes worth of the value specified by 63ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner/// FillValue. This implements directives such as '.space'. 64aaec205b87637cd0d59d4f11630db603686eb73dChris Lattnervoid MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue, 65aaec205b87637cd0d59d4f11630db603686eb73dChris Lattner unsigned AddrSpace) { 66ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner const MCExpr *E = MCConstantExpr::Create(FillValue, getContext()); 67ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner for (uint64_t i = 0, e = NumBytes; i != e; ++i) 68aaec205b87637cd0d59d4f11630db603686eb73dChris Lattner EmitValue(E, 1, AddrSpace); 69ddf6bdde44287b5b559bc403a02ff971e15e8303Chris Lattner} 7091bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner 71ab3b3651add0915a5a051b177029ad117a877f52Matt Fleming/// EmitRawText - If this file is backed by an assembly streamer, this dumps 7291bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner/// the specified string in the output .s file. This capability is 7391bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner/// indicated by the hasRawTextSupport() predicate. 7491bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattnervoid MCStreamer::EmitRawText(StringRef String) { 7591bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner errs() << "EmitRawText called on an MCStreamer that doesn't support it, " 7691bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner " something must not be fully mc'ized\n"; 7791bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner abort(); 7891bead790518fcf5cb26019fb1ebf2372e8a5b3fChris Lattner} 7958bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner 8058bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattnervoid MCStreamer::EmitRawText(const Twine &T) { 8158bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner SmallString<128> Str; 8258bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner T.toVector(Str); 8358bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner EmitRawText(Str.str()); 8458bc4dd4a91443ddd3120b0a2f1801ad4d6aae1cChris Lattner} 85