[llvm-commits] [llvm] r119510 - in /llvm/trunk: include/llvm/MC/MCStreamer.h lib/MC/CMakeLists.txt lib/MC/MCPureStreamer.cpp
Daniel Dunbar
daniel at zuster.org
Wed Nov 17 08:06:47 PST 2010
Author: ddunbar
Date: Wed Nov 17 10:06:47 2010
New Revision: 119510
URL: http://llvm.org/viewvc/llvm-project?rev=119510&view=rev
Log:
MC-JIT: Stub out "pure" streamer.
- No immediate use, but maybe someone feels like hacking on it.
Added:
llvm/trunk/lib/MC/MCPureStreamer.cpp
Modified:
llvm/trunk/include/llvm/MC/MCStreamer.h
llvm/trunk/lib/MC/CMakeLists.txt
Modified: llvm/trunk/include/llvm/MC/MCStreamer.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/MC/MCStreamer.h?rev=119510&r1=119509&r2=119510&view=diff
==============================================================================
--- llvm/trunk/include/llvm/MC/MCStreamer.h (original)
+++ llvm/trunk/include/llvm/MC/MCStreamer.h Wed Nov 17 10:06:47 2010
@@ -417,6 +417,13 @@
/// The new streamer takes ownership of the \arg Child.
MCStreamer *createLoggingStreamer(MCStreamer *Child, raw_ostream &OS);
+ /// createPureStreamer - Create a machine code streamer which will generate
+ /// "pure" MC object files, for use with MC-JIT and testing tools.
+ ///
+ /// Takes ownership of \arg TAB and \arg CE.
+ MCStreamer *createPureStreamer(MCContext &Ctx, TargetAsmBackend &TAB,
+ raw_ostream &OS, MCCodeEmitter *CE);
+
} // end namespace llvm
#endif
Modified: llvm/trunk/lib/MC/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/CMakeLists.txt?rev=119510&r1=119509&r2=119510&view=diff
==============================================================================
--- llvm/trunk/lib/MC/CMakeLists.txt (original)
+++ llvm/trunk/lib/MC/CMakeLists.txt Wed Nov 17 10:06:47 2010
@@ -20,6 +20,7 @@
MCObjectStreamer.cpp
MCObjectFormat.cpp
MCObjectWriter.cpp
+ MCPureStreamer.cpp
MCSection.cpp
MCSectionCOFF.cpp
MCSectionELF.cpp
Added: llvm/trunk/lib/MC/MCPureStreamer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/MCPureStreamer.cpp?rev=119510&view=auto
==============================================================================
--- llvm/trunk/lib/MC/MCPureStreamer.cpp (added)
+++ llvm/trunk/lib/MC/MCPureStreamer.cpp Wed Nov 17 10:06:47 2010
@@ -0,0 +1,259 @@
+//===- lib/MC/MCPureStreamer.cpp - MC "Pure" Object 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/MCStreamer.h"
+#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCObjectStreamer.h"
+// FIXME: Remove this.
+#include "llvm/MC/MCSectionMachO.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Support/ErrorHandling.h"
+
+using namespace llvm;
+
+namespace {
+
+class MCPureStreamer : public MCObjectStreamer {
+private:
+ virtual void EmitInstToFragment(const MCInst &Inst);
+ virtual void EmitInstToData(const MCInst &Inst);
+
+public:
+ MCPureStreamer(MCContext &Context, TargetAsmBackend &TAB,
+ raw_ostream &OS, MCCodeEmitter *Emitter)
+ : MCObjectStreamer(Context, TAB, OS, Emitter,
+ /*PadSectionToAlignment=*/true) {}
+
+ /// @name MCStreamer Interface
+ /// @{
+
+ virtual void InitSections();
+ virtual void EmitLabel(MCSymbol *Symbol);
+ virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
+ virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
+ unsigned Size = 0, unsigned ByteAlignment = 0);
+ virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
+ virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace);
+ virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
+ unsigned ValueSize = 1,
+ unsigned MaxBytesToEmit = 0);
+ virtual void EmitCodeAlignment(unsigned ByteAlignment,
+ unsigned MaxBytesToEmit = 0);
+ virtual void EmitValueToOffset(const MCExpr *Offset,
+ unsigned char Value = 0);
+ virtual void Finish();
+
+
+ virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) {
+ report_fatal_error("unsupported directive in pure streamer");
+ }
+ virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) {
+ report_fatal_error("unsupported directive in pure streamer");
+ }
+ virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
+ uint64_t Size, unsigned ByteAlignment = 0) {
+ report_fatal_error("unsupported directive in pure streamer");
+ }
+ virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
+ report_fatal_error("unsupported directive in pure streamer");
+ }
+ virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) {
+ report_fatal_error("unsupported directive in pure streamer");
+ }
+ virtual void EmitThumbFunc(MCSymbol *Func) {
+ report_fatal_error("unsupported directive in pure streamer");
+ }
+ virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {
+ report_fatal_error("unsupported directive in pure streamer");
+ }
+ virtual void EmitCOFFSymbolStorageClass(int StorageClass) {
+ report_fatal_error("unsupported directive in pure streamer");
+ }
+ virtual void EmitCOFFSymbolType(int Type) {
+ report_fatal_error("unsupported directive in pure streamer");
+ }
+ virtual void EndCOFFSymbolDef() {
+ report_fatal_error("unsupported directive in pure streamer");
+ }
+ virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
+ report_fatal_error("unsupported directive in pure streamer");
+ }
+ virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
+ report_fatal_error("unsupported directive in pure streamer");
+ }
+ virtual void EmitGPRel32Value(const MCExpr *Value) {
+ report_fatal_error("unsupported directive in pure streamer");
+ }
+ virtual void EmitFileDirective(StringRef Filename) {
+ report_fatal_error("unsupported directive in pure streamer");
+ }
+ virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Filename) {
+ report_fatal_error("unsupported directive in pure streamer");
+ return false;
+ }
+
+ /// @}
+};
+
+} // end anonymous namespace.
+
+void MCPureStreamer::InitSections() {
+ // FIMXE: To what!?
+ SwitchSection(getContext().getMachOSection("__TEXT", "__text",
+ MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
+ 0, SectionKind::getText()));
+
+}
+
+void MCPureStreamer::EmitLabel(MCSymbol *Symbol) {
+ assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
+ assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
+ assert(CurSection && "Cannot emit before setting section!");
+
+ Symbol->setSection(*CurSection);
+
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+
+ // We have to create a new fragment if this is an atom defining symbol,
+ // fragments cannot span atoms.
+ if (getAssembler().isSymbolLinkerVisible(SD.getSymbol()))
+ new MCDataFragment(getCurrentSectionData());
+
+ // FIXME: This is wasteful, we don't necessarily need to create a data
+ // fragment. Instead, we should mark the symbol as pointing into the data
+ // fragment if it exists, otherwise we should just queue the label and set its
+ // fragment pointer when we emit the next fragment.
+ MCDataFragment *F = getOrCreateDataFragment();
+ assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
+ SD.setFragment(F);
+ SD.setOffset(F->getContents().size());
+}
+
+void MCPureStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
+ // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
+ // MCObjectStreamer.
+ // FIXME: Lift context changes into super class.
+ getAssembler().getOrCreateSymbolData(*Symbol);
+ Symbol->setVariableValue(AddValueSymbols(Value));
+}
+
+void MCPureStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
+ unsigned Size, unsigned ByteAlignment) {
+ report_fatal_error("not yet implemented in pure streamer");
+}
+
+void MCPureStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
+ // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
+ // MCObjectStreamer.
+ getOrCreateDataFragment()->getContents().append(Data.begin(), Data.end());
+}
+
+void MCPureStreamer::EmitValue(const MCExpr *Value, unsigned Size,
+ unsigned AddrSpace) {
+ // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
+ // MCObjectStreamer.
+ MCDataFragment *DF = getOrCreateDataFragment();
+
+ // Avoid fixups when possible.
+ int64_t AbsValue;
+ if (AddValueSymbols(Value)->EvaluateAsAbsolute(AbsValue)) {
+ // FIXME: Endianness assumption.
+ for (unsigned i = 0; i != Size; ++i)
+ DF->getContents().push_back(uint8_t(AbsValue >> (i * 8)));
+ } else {
+ DF->addFixup(MCFixup::Create(DF->getContents().size(),
+ AddValueSymbols(Value),
+ MCFixup::getKindForSize(Size)));
+ DF->getContents().resize(DF->getContents().size() + Size, 0);
+ }
+}
+
+void MCPureStreamer::EmitValueToAlignment(unsigned ByteAlignment,
+ int64_t Value, unsigned ValueSize,
+ unsigned MaxBytesToEmit) {
+ // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
+ // MCObjectStreamer.
+ if (MaxBytesToEmit == 0)
+ MaxBytesToEmit = ByteAlignment;
+ new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit,
+ getCurrentSectionData());
+
+ // Update the maximum alignment on the current section if necessary.
+ if (ByteAlignment > getCurrentSectionData()->getAlignment())
+ getCurrentSectionData()->setAlignment(ByteAlignment);
+}
+
+void MCPureStreamer::EmitCodeAlignment(unsigned ByteAlignment,
+ unsigned MaxBytesToEmit) {
+ // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
+ // MCObjectStreamer.
+ if (MaxBytesToEmit == 0)
+ MaxBytesToEmit = ByteAlignment;
+ MCAlignFragment *F = new MCAlignFragment(ByteAlignment, 0, 1, MaxBytesToEmit,
+ getCurrentSectionData());
+ F->setEmitNops(true);
+
+ // Update the maximum alignment on the current section if necessary.
+ if (ByteAlignment > getCurrentSectionData()->getAlignment())
+ getCurrentSectionData()->setAlignment(ByteAlignment);
+}
+
+void MCPureStreamer::EmitValueToOffset(const MCExpr *Offset,
+ unsigned char Value) {
+ new MCOrgFragment(*Offset, Value, getCurrentSectionData());
+}
+
+void MCPureStreamer::EmitInstToFragment(const MCInst &Inst) {
+ MCInstFragment *IF = new MCInstFragment(Inst, getCurrentSectionData());
+
+ // Add the fixups and data.
+ //
+ // FIXME: Revisit this design decision when relaxation is done, we may be
+ // able to get away with not storing any extra data in the MCInst.
+ SmallVector<MCFixup, 4> Fixups;
+ SmallString<256> Code;
+ raw_svector_ostream VecOS(Code);
+ getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
+ VecOS.flush();
+
+ IF->getCode() = Code;
+ IF->getFixups() = Fixups;
+}
+
+void MCPureStreamer::EmitInstToData(const MCInst &Inst) {
+ MCDataFragment *DF = getOrCreateDataFragment();
+
+ SmallVector<MCFixup, 4> Fixups;
+ SmallString<256> Code;
+ raw_svector_ostream VecOS(Code);
+ getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
+ VecOS.flush();
+
+ // Add the fixups and data.
+ for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
+ Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
+ DF->addFixup(Fixups[i]);
+ }
+ DF->getContents().append(Code.begin(), Code.end());
+}
+
+void MCPureStreamer::Finish() {
+ // FIXME: Handle DWARF tables?
+
+ this->MCObjectStreamer::Finish();
+}
+
+MCStreamer *llvm::createPureStreamer(MCContext &Context, TargetAsmBackend &TAB,
+ raw_ostream &OS, MCCodeEmitter *CE) {
+ return new MCPureStreamer(Context, TAB, OS, CE);
+}
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