DbgVariable: Add an accessor for the common case of a single expression

belonging to a single DBG_VALUE instruction.

NFC

llvm-svn: 261167

2 files changed, 5 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
index 9dd5040ce81..5febd9fb380 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -771,8 +771,7 @@ void DwarfCompileUnit::addComplexAddress(const DbgVariable &DV, DIE &Die,
                                          const MachineLocation &Location) {
   DIELoc *Loc = new (DIEValueAllocator) DIELoc;
   DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
-  assert(DV.getExpression().size() == 1);
-  const DIExpression *Expr = DV.getExpression().back();
+  const DIExpression *Expr = DV.getSingleExpression();
   bool ValidReg;
   if (Location.getOffset()) {
     ValidReg = DwarfExpr.AddMachineRegIndirect(Location.getReg(),
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 31303e4ba38..f0859ec1a8f 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -111,6 +111,10 @@ public:
   const DILocalVariable *getVariable() const { return Var; }
   const DILocation *getInlinedAt() const { return IA; }
   ArrayRef<const DIExpression *> getExpression() const { return Expr; }
+  const DIExpression *getSingleExpression() const {
+    assert(MInsn && Expr.size() <= 1);
+    return Expr.size() ? Expr[0] : nullptr;
+  }
   void setDIE(DIE &D) { TheDIE = &D; }
   DIE *getDIE() const { return TheDIE; }
   void setDebugLocListIndex(unsigned O) { DebugLocListIndex = O; }