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

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

diff --git a/lib/MC/MCSymbol.cpp b/lib/MC/MCSymbol.cpp
index 3fb12336c4fc8f967fc6ef423962d0238ca49882..1c71f267a4b5cbd711fbc6ef9602d90777a55c64 100644 (file)
--- a/lib/MC/MCSymbol.cpp
+++ b/lib/MC/MCSymbol.cpp
@@ -8,6 +8,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCExpr.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
 using namespace llvm;
@@ -38,6 +39,30 @@ static bool NameNeedsQuoting(StringRef Str) {
   return false;
 }
 
+const MCSymbol &MCSymbol::AliasedSymbol() const {
+  const MCSymbol *S = this;
+  while (S->isVariable()) {
+    const MCExpr *Value = S->getVariableValue();
+    if (Value->getKind() != MCExpr::SymbolRef)
+      return *S;
+    const MCSymbolRefExpr *Ref = static_cast<const MCSymbolRefExpr*>(Value);
+    S = &Ref->getSymbol();
+  }
+  return *S;
+}
+
+void MCSymbol::setVariableValue(const MCExpr *Value) {
+  assert(!IsUsed && "Cannot set a variable that has already been used.");
+  assert(Value && "Invalid variable value!");
+  assert((isUndefined() || (isAbsolute() && isa<MCConstantExpr>(Value))) &&
+         "Invalid redefinition!");
+  this->Value = Value;
+
+  // Mark the variable as absolute as appropriate.
+  if (isa<MCConstantExpr>(Value))
+    setAbsolute();
+}
+
 void MCSymbol::print(raw_ostream &OS) const {
   // The name for this MCSymbol is required to be a valid target name.  However,
   // some targets support quoting names with funny characters.  If the name