From 33966cf988cb9db5c8f839bf8b8509f12db4a529 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Tue, 21 Oct 2014 00:25:49 +0000
Subject: [PATCH] Make AsmPrinter::EmitLabelOffsetDifference a static helper
 and simplify.

It had exactly one caller in a position where we know hasSetDirective is true.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220250 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/AsmPrinter.h     |  6 ------
 lib/CodeGen/AsmPrinter/AsmPrinter.cpp | 30 ---------------------------
 lib/CodeGen/AsmPrinter/DIE.cpp        | 30 ++++++++++++++++++++++++---
 3 files changed, 27 insertions(+), 39 deletions(-)

diff --git a/include/llvm/CodeGen/AsmPrinter.h b/include/llvm/CodeGen/AsmPrinter.h
index 0208cbd17aa..25b99a2c697 100644
--- a/include/llvm/CodeGen/AsmPrinter.h
+++ b/include/llvm/CodeGen/AsmPrinter.h
@@ -349,12 +349,6 @@ public:
   void EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
                            unsigned Size) const;
 
-  /// Emit something like ".long Hi+Offset-Lo" where the size in bytes of the
-  /// directive is specified by Size and Hi/Lo specify the labels.  This
-  /// implicitly uses .set if it is available.
-  void EmitLabelOffsetDifference(const MCSymbol *Hi, uint64_t Offset,
-                                 const MCSymbol *Lo, unsigned Size) const;
-
   /// Emit something like ".long Label+Offset" where the size in bytes of the
   /// directive is specified by Size and Label specifies the label.  This
   /// implicitly uses .set if it is available.
diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 48f20ac39c2..dd0d40dc0c3 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -1463,36 +1463,6 @@ void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
   OutStreamer.EmitSymbolValue(SetLabel, Size);
 }
 
-/// EmitLabelOffsetDifference - Emit something like ".long Hi+Offset-Lo"
-/// where the size in bytes of the directive is specified by Size and Hi/Lo
-/// specify the labels.  This implicitly uses .set if it is available.
-void AsmPrinter::EmitLabelOffsetDifference(const MCSymbol *Hi, uint64_t Offset,
-                                           const MCSymbol *Lo,
-                                           unsigned Size) const {
-
-  // Emit Hi+Offset - Lo
-  // Get the Hi+Offset expression.
-  const MCExpr *Plus =
-    MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Hi, OutContext),
-                            MCConstantExpr::Create(Offset, OutContext),
-                            OutContext);
-
-  // Get the Hi+Offset-Lo expression.
-  const MCExpr *Diff =
-    MCBinaryExpr::CreateSub(Plus,
-                            MCSymbolRefExpr::Create(Lo, OutContext),
-                            OutContext);
-
-  if (!MAI->hasSetDirective())
-    OutStreamer.EmitValue(Diff, Size);
-  else {
-    // Otherwise, emit with .set (aka assignment).
-    MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
-    OutStreamer.EmitAssignment(SetLabel, Diff);
-    OutStreamer.EmitSymbolValue(SetLabel, Size);
-  }
-}
-
 /// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
 /// where the size in bytes of the directive is specified by Size and Label
 /// specifies the label.  This implicitly uses .set if it is available.
diff --git a/lib/CodeGen/AsmPrinter/DIE.cpp b/lib/CodeGen/AsmPrinter/DIE.cpp
index 25dec5893c6..50ea369b432 100644
--- a/lib/CodeGen/AsmPrinter/DIE.cpp
+++ b/lib/CodeGen/AsmPrinter/DIE.cpp
@@ -20,6 +20,7 @@
 #include "llvm/CodeGen/AsmPrinter.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSymbol.h"
 #include "llvm/Support/Debug.h"
@@ -372,6 +373,29 @@ void DIEString::print(raw_ostream &O) const {
 // DIEEntry Implementation
 //===----------------------------------------------------------------------===//
 
+/// Emit something like ".long Hi+Offset-Lo" where the size in bytes of the
+/// directive is specified by Size and Hi/Lo specify the labels.
+static void emitLabelOffsetDifference(MCStreamer &Streamer, const MCSymbol *Hi,
+                                      uint64_t Offset, const MCSymbol *Lo,
+                                      unsigned Size) {
+  MCContext &Context = Streamer.getContext();
+
+  // Emit Hi+Offset - Lo
+  // Get the Hi+Offset expression.
+  const MCExpr *Plus =
+      MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Hi, Context),
+                              MCConstantExpr::Create(Offset, Context), Context);
+
+  // Get the Hi+Offset-Lo expression.
+  const MCExpr *Diff = MCBinaryExpr::CreateSub(
+      Plus, MCSymbolRefExpr::Create(Lo, Context), Context);
+
+  // Otherwise, emit with .set (aka assignment).
+  MCSymbol *SetLabel = Context.CreateTempSymbol();
+  Streamer.EmitAssignment(SetLabel, Diff);
+  Streamer.EmitSymbolValue(SetLabel, Size);
+}
+
 /// EmitValue - Emit debug information entry offset.
 ///
 void DIEEntry::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
@@ -390,9 +414,9 @@ void DIEEntry::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
       AP->EmitLabelPlusOffset(CU->getSectionSym(), Addr,
                               DIEEntry::getRefAddrSize(AP));
     else
-      AP->EmitLabelOffsetDifference(CU->getSectionSym(), Addr,
-                                    CU->getSectionSym(),
-                                    DIEEntry::getRefAddrSize(AP));
+      emitLabelOffsetDifference(AP->OutStreamer, CU->getSectionSym(), Addr,
+                                CU->getSectionSym(),
+                                DIEEntry::getRefAddrSize(AP));
   } else
     AP->EmitInt32(Entry.getOffset());
 }
-- 
2.34.1