From b4601bd2ffdde372f1323f6b6ec98acd433501ce Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Wed, 29 Dec 2010 00:26:06 +0000
Subject: [PATCH] Implement cfi_def_cfa_register.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122612 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/MC/MCStreamer.cpp              |  8 ++++++
 test/MC/ELF/cfi-def-cfa-register.s | 41 ++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)
 create mode 100644 test/MC/ELF/cfi-def-cfa-register.s

diff --git a/lib/MC/MCStreamer.cpp b/lib/MC/MCStreamer.cpp
index f5e0d20e098..4d7d486ea91 100644
--- a/lib/MC/MCStreamer.cpp
+++ b/lib/MC/MCStreamer.cpp
@@ -186,6 +186,14 @@ bool MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
 
 bool MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
   EnsureValidFrame();
+  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  MCSymbol *Label = getContext().CreateTempSymbol();
+  EmitLabel(Label);
+  MachineLocation Dest(Register);
+  MachineLocation Source(MachineLocation::VirtualFP);
+  MCCFIInstruction Instruction(Label, Dest, Source);
+  CurFrame->Instructions.push_back(Instruction);
+  return false;
   return false;
 }
 
diff --git a/test/MC/ELF/cfi-def-cfa-register.s b/test/MC/ELF/cfi-def-cfa-register.s
new file mode 100644
index 00000000000..3df20218a27
--- /dev/null
+++ b/test/MC/ELF/cfi-def-cfa-register.s
@@ -0,0 +1,41 @@
+// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - | elf-dump  --dump-section-data | FileCheck %s
+
+f:
+	.cfi_startproc
+        nop
+	.cfi_def_cfa_register 6
+        nop
+	.cfi_endproc
+
+// CHECK:      (('sh_name', 0x00000012) # '.eh_frame'
+// CHECK-NEXT:  ('sh_type', 0x00000001)
+// CHECK-NEXT:  ('sh_flags', 0x00000002)
+// CHECK-NEXT:  ('sh_addr', 0x00000000)
+// CHECK-NEXT:  ('sh_offset', 0x00000048)
+// CHECK-NEXT:  ('sh_size', 0x00000030)
+// CHECK-NEXT:  ('sh_link', 0x00000000)
+// CHECK-NEXT:  ('sh_info', 0x00000000)
+// CHECK-NEXT:  ('sh_addralign', 0x00000008)
+// CHECK-NEXT:  ('sh_entsize', 0x00000000)
+// CHECK-NEXT:  ('_section_data', '14000000 00000000 017a5200 01781001 1b0c0708 90010000 14000000 1c000000 00000000 02000000 00410d06 00000000')
+// CHECK-NEXT: ),
+
+// CHECK:      (('sh_name', 0x00000036) # '.rela.eh_frame'
+// CHECK-NEXT:  ('sh_type', 0x00000004)
+// CHECK-NEXT:  ('sh_flags', 0x00000000)
+// CHECK-NEXT:  ('sh_addr', 0x00000000)
+// CHECK-NEXT:  ('sh_offset', 0x00000158)
+// CHECK-NEXT:  ('sh_size', 0x00000018)
+// CHECK-NEXT:  ('sh_link', 0x00000006)
+// CHECK-NEXT:  ('sh_info', 0x00000004)
+// CHECK-NEXT:  ('sh_addralign', 0x00000008)
+// CHECK-NEXT:  ('sh_entsize', 0x00000018)
+// CHECK-NEXT:  ('_relocations', [
+// CHECK-NEXT:   # Relocation 0x00000000
+// CHECK-NEXT:   (('r_offset', 0x00000020)
+// CHECK-NEXT:    ('r_sym', 0x00000002)
+// CHECK-NEXT:    ('r_type', 0x00000002)
+// CHECK-NEXT:    ('r_addend', 0x00000000)
+// CHECK-NEXT:   ),
+// CHECK-NEXT:  ])
+// CHECK-NEXT: ),