add scaffolding for target-specific MCExprs.

llvm-svn: 95559

2 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/MC/MCExpr.cpp b/llvm/lib/MC/MCExpr.cpp
index 1ee1b1bddb7..07546c1b29b 100644
--- a/llvm/lib/MC/MCExpr.cpp
+++ b/llvm/lib/MC/MCExpr.cpp
@@ -17,6 +17,8 @@ using namespace llvm;
 
 void MCExpr::print(raw_ostream &OS) const {
   switch (getKind()) {
+  case MCExpr::Target:
+    return cast<MCTargetExpr>(this)->PrintImpl(OS);
   case MCExpr::Constant:
     OS << cast<MCConstantExpr>(*this).getValue();
     return;
@@ -131,6 +133,7 @@ const MCSymbolRefExpr *MCSymbolRefExpr::Create(StringRef Name, MCContext &Ctx) {
   return Create(Ctx.GetOrCreateSymbol(Name), Ctx);
 }
 
+MCTargetExpr::~MCTargetExpr() {}
 
 /* *** */
 
@@ -168,6 +171,9 @@ static bool EvaluateSymbolicAdd(const MCValue &LHS, const MCSymbol *RHS_A,
 
 bool MCExpr::EvaluateAsRelocatable(MCValue &Res) const {
   switch (getKind()) {
+  case Target:
+    return cast<MCTargetExpr>(this)->EvaluateAsRelocatableImpl(Res);
+      
   case Constant:
     Res = MCValue::get(cast<MCConstantExpr>(this)->getValue());
     return true;
diff --git a/llvm/lib/MC/MCMachOStreamer.cpp b/llvm/lib/MC/MCMachOStreamer.cpp
index 981eb72d14c..40a21ad5dd2 100644
--- a/llvm/lib/MC/MCMachOStreamer.cpp
+++ b/llvm/lib/MC/MCMachOStreamer.cpp
@@ -87,6 +87,7 @@ public:
 
   const MCExpr *AddValueSymbols(const MCExpr *Value) {
     switch (Value->getKind()) {
+    case MCExpr::Target: assert(0 && "Can't handle target exprs yet!");
     case MCExpr::Constant:
       break;