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-rw-r--r--contrib/llvm/lib/MC/MCStreamer.cpp275
1 files changed, 275 insertions, 0 deletions
diff --git a/contrib/llvm/lib/MC/MCStreamer.cpp b/contrib/llvm/lib/MC/MCStreamer.cpp
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+++ b/contrib/llvm/lib/MC/MCStreamer.cpp
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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) {
+ PrevSectionStack.push_back(NULL);
+ CurSectionStack.push_back(NULL);
+}
+
+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((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
+ "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().hasAggressiveSymbolFolding()) {
+ 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;
+ 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::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
+ EnsureValidFrame();
+ MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+ MCSymbol *Label = getContext().CreateTempSymbol();
+ EmitLabel(Label);
+ MachineLocation Dest(MachineLocation::VirtualFP);
+ MachineLocation Source(Register, -Offset);
+ MCCFIInstruction Instruction(Label, Dest, Source);
+ CurFrame->Instructions.push_back(Instruction);
+ return false;
+}
+
+bool MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
+ EnsureValidFrame();
+ MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+ MCSymbol *Label = getContext().CreateTempSymbol();
+ EmitLabel(Label);
+ MachineLocation Dest(MachineLocation::VirtualFP);
+ MachineLocation Source(MachineLocation::VirtualFP, -Offset);
+ MCCFIInstruction Instruction(Label, Dest, Source);
+ CurFrame->Instructions.push_back(Instruction);
+ return false;
+}
+
+bool MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
+ EnsureValidFrame();
+ MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+ MCSymbol *Label = getContext().CreateTempSymbol();
+ EmitLabel(Label);
+ MachineLocation Dest(Register);
+ MachineLocation Source(MachineLocation::VirtualFP);
+ MCCFIInstruction Instruction(Label, Dest, Source);
+ CurFrame->Instructions.push_back(Instruction);
+ return false;
+}
+
+bool MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
+ EnsureValidFrame();
+ MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+ MCSymbol *Label = getContext().CreateTempSymbol();
+ EmitLabel(Label);
+ MachineLocation Dest(Register, Offset);
+ MachineLocation Source(Register, Offset);
+ MCCFIInstruction Instruction(Label, Dest, Source);
+ CurFrame->Instructions.push_back(Instruction);
+ return false;
+}
+
+bool MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
+ unsigned Encoding) {
+ EnsureValidFrame();
+ MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+ CurFrame->Personality = Sym;
+ CurFrame->PersonalityEncoding = Encoding;
+ return false;
+}
+
+bool MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
+ EnsureValidFrame();
+ MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+ CurFrame->Lsda = Sym;
+ CurFrame->LsdaEncoding = Encoding;
+ return false;
+}
+
+bool MCStreamer::EmitCFIRememberState() {
+ EnsureValidFrame();
+ MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+ MCSymbol *Label = getContext().CreateTempSymbol();
+ EmitLabel(Label);
+ MCCFIInstruction Instruction(MCCFIInstruction::Remember, Label);
+ CurFrame->Instructions.push_back(Instruction);
+ return false;
+}
+
+bool MCStreamer::EmitCFIRestoreState() {
+ // FIXME: Error if there is no matching cfi_remember_state.
+ EnsureValidFrame();
+ MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+ MCSymbol *Label = getContext().CreateTempSymbol();
+ EmitLabel(Label);
+ MCCFIInstruction Instruction(MCCFIInstruction::Restore, Label);
+ CurFrame->Instructions.push_back(Instruction);
+ 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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