X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FMC%2FMCObjectStreamer.cpp;h=a04ae0812a3eca20ccc8acd9f876b572d4b814cc;hb=833a003da082ab0db343e0e640069dfc6813e7d6;hp=a514858545a127796d9c38b2ea5fdb312eacc7fb;hpb=ee4854faf3a4dc622dcb75fe352e33fb32385b3f;p=oota-llvm.git

diff --git a/lib/MC/MCObjectStreamer.cpp b/lib/MC/MCObjectStreamer.cpp
index a514858545a..a04ae0812a3 100644
--- a/lib/MC/MCObjectStreamer.cpp
+++ b/lib/MC/MCObjectStreamer.cpp
@@ -7,31 +7,40 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCObjectStreamer.h"
 
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/MC/MCAssembler.h"
 #include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCDwarf.h"
 #include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCSymbol.h"
-#include "llvm/Target/TargetAsmBackend.h"
+#include "llvm/MC/MCAsmBackend.h"
 using namespace llvm;
 
-MCObjectStreamer::MCObjectStreamer(MCContext &Context, TargetAsmBackend &TAB,
-                                   raw_ostream &_OS, MCCodeEmitter *_Emitter,
-                                   bool _PadSectionToAlignment)
-  : MCStreamer(Context), Assembler(new MCAssembler(Context, TAB,
-                                                   *_Emitter,
-                                                   _PadSectionToAlignment,
-                                                   _OS)),
+MCObjectStreamer::MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB,
+                                   raw_ostream &OS, MCCodeEmitter *Emitter_)
+  : MCStreamer(Context),
+    Assembler(new MCAssembler(Context, TAB,
+                              *Emitter_, *TAB.createObjectWriter(OS),
+                              OS)),
     CurSectionData(0)
 {
 }
 
+MCObjectStreamer::MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB,
+                                   raw_ostream &OS, MCCodeEmitter *Emitter_,
+                                   MCAssembler *_Assembler)
+  : MCStreamer(Context), Assembler(_Assembler), CurSectionData(0)
+{
+}
+
 MCObjectStreamer::~MCObjectStreamer() {
   delete &Assembler->getBackend();
   delete &Assembler->getEmitter();
+  delete &Assembler->getWriter();
   delete Assembler;
 }
 
@@ -53,7 +62,10 @@ MCDataFragment *MCObjectStreamer::getOrCreateDataFragment() const {
 
 const MCExpr *MCObjectStreamer::AddValueSymbols(const MCExpr *Value) {
   switch (Value->getKind()) {
-  case MCExpr::Target: llvm_unreachable("Can't handle target exprs yet!");
+  case MCExpr::Target:
+    cast<MCTargetExpr>(Value)->AddValueSymbols(Assembler);
+    break;
+
   case MCExpr::Constant:
     break;
 
@@ -76,30 +88,25 @@ const MCExpr *MCObjectStreamer::AddValueSymbols(const MCExpr *Value) {
   return Value;
 }
 
-void MCObjectStreamer::EmitValue(const MCExpr *Value, unsigned Size,
-                                 unsigned AddrSpace, bool UseSet) {
+void MCObjectStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
+                                     unsigned AddrSpace) {
   assert(AddrSpace == 0 && "Address space must be 0!");
   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, false)));
-    DF->getContents().resize(DF->getContents().size() + Size, 0);
+  if (AddValueSymbols(Value)->EvaluateAsAbsolute(AbsValue, getAssembler())) {
+    EmitIntValue(AbsValue, Size, AddrSpace);
+    return;
   }
+  DF->addFixup(MCFixup::Create(DF->getContents().size(),
+                               Value,
+                               MCFixup::getKindForSize(Size, false)));
+  DF->getContents().resize(DF->getContents().size() + Size, 0);
 }
 
 void MCObjectStreamer::EmitLabel(MCSymbol *Symbol) {
-  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
-  assert(CurSection && "Cannot emit before setting section!");
-
-  Symbol->setSection(*CurSection);
+  MCStreamer::EmitLabel(Symbol);
 
   MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
 
@@ -113,13 +120,23 @@ void MCObjectStreamer::EmitLabel(MCSymbol *Symbol) {
   SD.setOffset(F->getContents().size());
 }
 
-void MCObjectStreamer::EmitULEB128Value(const MCExpr *Value,
-                                        unsigned AddrSpace) {
+void MCObjectStreamer::EmitULEB128Value(const MCExpr *Value) {
+  int64_t IntValue;
+  if (Value->EvaluateAsAbsolute(IntValue, getAssembler())) {
+    EmitULEB128IntValue(IntValue);
+    return;
+  }
+  Value = ForceExpAbs(Value);
   new MCLEBFragment(*Value, false, getCurrentSectionData());
 }
 
-void MCObjectStreamer::EmitSLEB128Value(const MCExpr *Value,
-                                        unsigned AddrSpace) {
+void MCObjectStreamer::EmitSLEB128Value(const MCExpr *Value) {
+  int64_t IntValue;
+  if (Value->EvaluateAsAbsolute(IntValue, getAssembler())) {
+    EmitSLEB128IntValue(IntValue);
+    return;
+  }
+  Value = ForceExpAbs(Value);
   new MCLEBFragment(*Value, true, getCurrentSectionData());
 }
 
@@ -128,14 +145,9 @@ void MCObjectStreamer::EmitWeakReference(MCSymbol *Alias,
   report_fatal_error("This file format doesn't support weak aliases.");
 }
 
-void MCObjectStreamer::SwitchSection(const MCSection *Section) {
+void MCObjectStreamer::ChangeSection(const MCSection *Section) {
   assert(Section && "Cannot switch to a null section!");
 
-  // If already in this section, then this is a noop.
-  if (Section == CurSection) return;
-
-  PrevSection = CurSection;
-  CurSection = Section;
   CurSectionData = &getAssembler().getOrCreateSectionData(*Section);
 }
 
@@ -175,15 +187,68 @@ void MCObjectStreamer::EmitInstruction(const MCInst &Inst) {
 void MCObjectStreamer::EmitInstToFragment(const MCInst &Inst) {
   MCInstFragment *IF = new MCInstFragment(Inst, getCurrentSectionData());
 
-  raw_svector_ostream VecOS(IF->getCode());
+  SmallString<128> Code;
+  raw_svector_ostream VecOS(Code);
   getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, IF->getFixups());
+  VecOS.flush();
+  IF->getCode().append(Code.begin(), Code.end());
+}
+
+void MCObjectStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
+                                                const MCSymbol *LastLabel,
+                                                const MCSymbol *Label,
+                                                unsigned PointerSize) {
+  if (!LastLabel) {
+    EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
+    return;
+  }
+  const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
+  int64_t Res;
+  if (AddrDelta->EvaluateAsAbsolute(Res, getAssembler())) {
+    MCDwarfLineAddr::Emit(this, LineDelta, Res);
+    return;
+  }
+  AddrDelta = ForceExpAbs(AddrDelta);
+  new MCDwarfLineAddrFragment(LineDelta, *AddrDelta, getCurrentSectionData());
+}
+
+void MCObjectStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
+                                                 const MCSymbol *Label) {
+  const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
+  int64_t Res;
+  if (AddrDelta->EvaluateAsAbsolute(Res, getAssembler())) {
+    MCDwarfFrameEmitter::EmitAdvanceLoc(*this, Res);
+    return;
+  }
+  AddrDelta = ForceExpAbs(AddrDelta);
+  new MCDwarfCallFrameFragment(*AddrDelta, getCurrentSectionData());
 }
 
 void MCObjectStreamer::EmitValueToOffset(const MCExpr *Offset,
                                         unsigned char Value) {
-  new MCOrgFragment(*Offset, Value, getCurrentSectionData());
+  int64_t Res;
+  if (Offset->EvaluateAsAbsolute(Res, getAssembler())) {
+    new MCOrgFragment(*Offset, Value, getCurrentSectionData());
+    return;
+  }
+
+  MCSymbol *CurrentPos = getContext().CreateTempSymbol();
+  EmitLabel(CurrentPos);
+  MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
+  const MCExpr *Ref =
+    MCSymbolRefExpr::Create(CurrentPos, Variant, getContext());
+  const MCExpr *Delta =
+    MCBinaryExpr::Create(MCBinaryExpr::Sub, Offset, Ref, getContext());
+
+  if (!Delta->EvaluateAsAbsolute(Res, getAssembler()))
+    report_fatal_error("expected assembly-time absolute expression");
+  EmitFill(Res, Value, 0);
 }
 
 void MCObjectStreamer::Finish() {
+  // Dump out the dwarf file & directory tables and line tables.
+  if (getContext().hasDwarfFiles())
+    MCDwarfFileTable::Emit(this);
+
   getAssembler().Finish();
 }