From: Devang Patel <dpatel@apple.com>
Date: Wed, 22 Sep 2010 21:10:38 +0000 (+0000)
Subject: Use DW_OP_fbreg when offset is based on frame register.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=be90c3a0ea66fb05dfe72fbe42cca2713c6c8b1a;p=oota-llvm.git

Use DW_OP_fbreg when offset is based on frame register.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114585 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 8e3c1f12ff1..ae193e6966f 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -811,6 +811,16 @@ void DwarfDebug::addAddress(DIE *Die, unsigned Attribute,
   const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
   unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false);
   DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
+  const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
+
+  if (TRI->getFrameRegister(*Asm->MF) == Location.getReg()
+      && Location.getOffset()) {
+    // If variable offset is based in frame register then use fbreg.
+    addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_fbreg);
+    addSInt(Block, 0, dwarf::DW_FORM_sdata, Location.getOffset());
+    addBlock(Die, Attribute, 0, Block);
+    return;
+  }
 
   if (Location.isReg()) {
     if (Reg < 32) {