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//===- lib/MC/MCStreamer.cpp - Streaming Machine Code Output --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.h"
#include <cstdlib>
using namespace llvm;
MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx), CurSection(0),
PrevSection(0) {
}
MCStreamer::~MCStreamer() {
}
raw_ostream &MCStreamer::GetCommentOS() {
// By default, discard comments.
return nulls();
}
void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
const MCSymbol *Label, int PointerSize) {
// emit the sequence to set the address
EmitIntValue(dwarf::DW_LNS_extended_op, 1);
EmitULEB128IntValue(PointerSize + 1);
EmitIntValue(dwarf::DW_LNE_set_address, 1);
EmitSymbolValue(Label, PointerSize);
// emit the sequence for the LineDelta (from 1) and a zero address delta.
MCDwarfLineAddr::Emit(this, LineDelta, 0);
}
/// EmitIntValue - Special case of EmitValue that avoids the client having to
/// pass in a MCExpr for constant integers.
void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size,
unsigned AddrSpace) {
assert(Size <= 8 && "Invalid size");
assert(!(Size == 1 && (signed)Value > 255) && "Invalid size");
char buf[8];
// FIXME: Endianness assumption.
for (unsigned i = 0; i != Size; ++i)
buf[i] = uint8_t(Value >> (i * 8));
EmitBytes(StringRef(buf, Size), AddrSpace);
}
/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
/// client having to pass in a MCExpr for constant integers.
void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) {
SmallString<32> Tmp;
raw_svector_ostream OSE(Tmp);
MCObjectWriter::EncodeULEB128(Value, OSE);
EmitBytes(OSE.str(), AddrSpace);
}
/// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
/// client having to pass in a MCExpr for constant integers.
void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) {
SmallString<32> Tmp;
raw_svector_ostream OSE(Tmp);
MCObjectWriter::EncodeSLEB128(Value, OSE);
EmitBytes(OSE.str(), AddrSpace);
}
void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size,
unsigned AddrSpace) {
if (!getContext().getAsmInfo().needsSetToChangeDiffSize()) {
EmitValue(Value, Size, AddrSpace);
return;
}
MCSymbol *ABS = getContext().CreateTempSymbol();
EmitAssignment(ABS, Value);
EmitSymbolValue(ABS, Size, AddrSpace);
}
void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
unsigned AddrSpace) {
EmitValueImpl(Value, Size, false, AddrSpace);
}
void MCStreamer::EmitPCRelValue(const MCExpr *Value, unsigned Size,
unsigned AddrSpace) {
EmitValueImpl(Value, Size, true, AddrSpace);
}
void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
bool isPCRel, unsigned AddrSpace) {
EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size, isPCRel,
AddrSpace);
}
void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
unsigned AddrSpace) {
EmitSymbolValue(Sym, Size, false, AddrSpace);
}
void MCStreamer::EmitPCRelSymbolValue(const MCSymbol *Sym, unsigned Size,
unsigned AddrSpace) {
EmitSymbolValue(Sym, Size, true, AddrSpace);
}
void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
report_fatal_error("unsupported directive in streamer");
}
/// EmitFill - Emit NumBytes bytes worth of the value specified by
/// FillValue. This implements directives such as '.space'.
void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
unsigned AddrSpace) {
const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
for (uint64_t i = 0, e = NumBytes; i != e; ++i)
EmitValue(E, 1, AddrSpace);
}
bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
StringRef Filename) {
return getContext().GetDwarfFile(Filename, FileNo) == 0;
}
void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
unsigned Column, unsigned Flags,
unsigned Isa,
unsigned Discriminator) {
getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
Discriminator);
}
MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
if (FrameInfos.empty())
return NULL;
return &FrameInfos.back();
}
void MCStreamer::EnsureValidFrame() {
MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
if (!CurFrame || CurFrame->End)
report_fatal_error("No open frame");
}
bool MCStreamer::EmitCFIStartProc() {
MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
if (CurFrame && !CurFrame->End) {
report_fatal_error("Starting a frame before finishing the previous one!");
return true;
}
MCDwarfFrameInfo Frame = {0, 0, 0, 0};
Frame.Begin = getContext().CreateTempSymbol();
EmitLabel(Frame.Begin);
FrameInfos.push_back(Frame);
return false;
}
bool MCStreamer::EmitCFIEndProc() {
EnsureValidFrame();
MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
CurFrame->End = getContext().CreateTempSymbol();
EmitLabel(CurFrame->End);
return false;
}
bool MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
EnsureValidFrame();
return false;
}
bool MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
EnsureValidFrame();
return false;
}
bool MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
EnsureValidFrame();
return false;
}
bool MCStreamer::EmitCFIPersonality(const MCSymbol *Sym) {
EnsureValidFrame();
MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
CurFrame->Personality = Sym;
return false;
}
bool MCStreamer::EmitCFILsda(const MCSymbol *Sym) {
EnsureValidFrame();
MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
CurFrame->Lsda = Sym;
return false;
}
/// EmitRawText - If this file is backed by an assembly streamer, this dumps
/// the specified string in the output .s file. This capability is
/// indicated by the hasRawTextSupport() predicate.
void MCStreamer::EmitRawText(StringRef String) {
errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
" something must not be fully mc'ized\n";
abort();
}
void MCStreamer::EmitRawText(const Twine &T) {
SmallString<128> Str;
T.toVector(Str);
EmitRawText(Str.str());
}
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