Elaborate on comment.

[oota-llvm.git] / lib / CodeGen / AsmPrinter / DIE.h

diff --git a/lib/CodeGen/AsmPrinter/DIE.h b/lib/CodeGen/AsmPrinter/DIE.h
index bb58915f03d4d51c7350666d00dcac76cd314a76..3b04e206254b728a41ea55c8399d59442b6d973c 100644 (file)
--- a/lib/CodeGen/AsmPrinter/DIE.h
+++ b/lib/CodeGen/AsmPrinter/DIE.h
@@ -18,15 +18,17 @@
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/Dwarf.h"
+#include "llvm/MC/MCExpr.h"
 #include <vector>
 
 namespace llvm {
   class AsmPrinter;
   class MCSymbol;
+  class MCSymbolRefExpr;
   class raw_ostream;
 
   //===--------------------------------------------------------------------===//
-  /// DIEAbbrevData - Dwarf abbreviation data, describes the one attribute of a
+  /// DIEAbbrevData - Dwarf abbreviation data, describes one attribute of a
   /// Dwarf abbreviation.
   class DIEAbbrevData {
     /// Attribute - Dwarf attribute code.
@@ -188,6 +190,7 @@ namespace llvm {
     enum {
       isInteger,
       isString,
+      isExpr,
       isLabel,
       isDelta,
       isEntry,
@@ -261,7 +264,35 @@ namespace llvm {
   };
 
   //===--------------------------------------------------------------------===//
-  /// DIELabel - A label expression DIE.
+  /// DIEExpr - An expression DIE.
+  //
+  class DIEExpr : public DIEValue {
+    const MCExpr *Expr;
+  public:
+    explicit DIEExpr(const MCExpr *E) : DIEValue(isExpr), Expr(E) {}
+
+    /// EmitValue - Emit expression value.
+    ///
+    virtual void EmitValue(AsmPrinter *AP, unsigned Form) const;
+
+    /// getValue - Get MCExpr.
+    ///
+    const MCExpr *getValue() const { return Expr; }
+
+    /// SizeOf - Determine size of expression value in bytes.
+    ///
+    virtual unsigned SizeOf(AsmPrinter *AP, unsigned Form) const;
+
+    // Implement isa/cast/dyncast.
+    static bool classof(const DIEValue *E) { return E->getType() == isExpr; }
+
+#ifndef NDEBUG
+    virtual void print(raw_ostream &O) const;
+#endif
+  };
+
+  //===--------------------------------------------------------------------===//
+  /// DIELabel - A label DIE.
   //
   class DIELabel : public DIEValue {
     const MCSymbol *Label;
@@ -274,7 +305,7 @@ namespace llvm {
 
     /// getValue - Get MCSymbol.
     ///
-    const MCSymbol *getValue()       const { return Label; }
+    const MCSymbol *getValue() const { return Label; }
 
     /// SizeOf - Determine size of label value in bytes.
     ///
@@ -334,9 +365,13 @@ namespace llvm {
     /// SizeOf - Determine size of debug information entry in bytes.
     ///
     virtual unsigned SizeOf(AsmPrinter *AP, unsigned Form) const {
-      return sizeof(int32_t);
+      return Form == dwarf::DW_FORM_ref_addr ? getRefAddrSize(AP) :
+                                               sizeof(int32_t);
     }
 
+    /// Returns size of a ref_addr entry.
+    static unsigned getRefAddrSize(AsmPrinter *AP);
+
     // Implement isa/cast/dyncast.
     static bool classof(const DIEValue *E) { return E->getType() == isEntry; }