Make EmitIntValue more efficient and more like what we do for leb128. The

[oota-llvm.git] / lib / MC / MCObjectStreamer.cpp

diff --git a/lib/MC/MCObjectStreamer.cpp b/lib/MC/MCObjectStreamer.cpp
index e2cd96433ecce6fc44f9469e279e074270fd27ee..1538a58996656fe7da4eb26355ae3f05324926b8 100644 (file)
--- a/lib/MC/MCObjectStreamer.cpp
+++ b/lib/MC/MCObjectStreamer.cpp
@@ -76,6 +76,23 @@ const MCExpr *MCObjectStreamer::AddValueSymbols(const MCExpr *Value) {
   return Value;
 }
 
+void MCObjectStreamer::EmitValue(const MCExpr *Value, unsigned Size,
+                                 unsigned AddrSpace, bool UseSet) {
+  assert(AddrSpace == 0 && "Address space must be 0!");
+  MCDataFragment *DF = getOrCreateDataFragment();
+
+  // Avoid fixups when possible.
+  int64_t AbsValue;
+  if (AddValueSymbols(Value)->EvaluateAsAbsolute(AbsValue, &getAssembler())) {
+    EmitIntValue(AbsValue, Size, AddrSpace);
+    return;
+  }
+  DF->addFixup(MCFixup::Create(DF->getContents().size(),
+                               AddValueSymbols(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!");
@@ -96,11 +113,21 @@ void MCObjectStreamer::EmitLabel(MCSymbol *Symbol) {
 
 void MCObjectStreamer::EmitULEB128Value(const MCExpr *Value,
                                         unsigned AddrSpace) {
+  int64_t IntValue;
+  if (Value->EvaluateAsAbsolute(IntValue, &getAssembler())) {
+    EmitULEB128IntValue(IntValue, AddrSpace);
+    return;
+  }
   new MCLEBFragment(*Value, false, getCurrentSectionData());
 }
 
 void MCObjectStreamer::EmitSLEB128Value(const MCExpr *Value,
                                         unsigned AddrSpace) {
+  int64_t IntValue;
+  if (Value->EvaluateAsAbsolute(IntValue, &getAssembler())) {
+    EmitSLEB128IntValue(IntValue, AddrSpace);
+    return;
+  }
   new MCLEBFragment(*Value, true, getCurrentSectionData());
 }
 
@@ -153,6 +180,42 @@ void MCObjectStreamer::EmitInstruction(const MCInst &Inst) {
   EmitInstToFragment(Inst);
 }
 
+void MCObjectStreamer::EmitInstToFragment(const MCInst &Inst) {
+  MCInstFragment *IF = new MCInstFragment(Inst, getCurrentSectionData());
+
+  raw_svector_ostream VecOS(IF->getCode());
+  getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, IF->getFixups());
+}
+
+void MCObjectStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
+                                                const MCSymbol *LastLabel,
+                                                const MCSymbol *Label) {
+  if (!LastLabel) {
+    int PointerSize = getAssembler().getBackend().getPointerSize();
+    EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
+    return;
+  }
+  MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
+  const MCExpr *LabelRef =
+    MCSymbolRefExpr::Create(Label, Variant, getContext());
+  const MCExpr *LastLabelRef =
+    MCSymbolRefExpr::Create(LastLabel, Variant, getContext());
+  const MCExpr *AddrDelta =
+    MCBinaryExpr::Create(MCBinaryExpr::Sub, LabelRef, LastLabelRef,
+                         getContext());
+  int64_t Res;
+  if (AddrDelta->EvaluateAsAbsolute(Res, &getAssembler())) {
+    MCDwarfLineAddr::Emit(this, LineDelta, Res);
+    return;
+  }
+  new MCDwarfLineAddrFragment(LineDelta, *AddrDelta, getCurrentSectionData());
+}
+
+void MCObjectStreamer::EmitValueToOffset(const MCExpr *Offset,
+                                        unsigned char Value) {
+  new MCOrgFragment(*Offset, Value, getCurrentSectionData());
+}
+
 void MCObjectStreamer::Finish() {
   getAssembler().Finish();
 }