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