From 0db8cb01472f483ec676c9fc91f3d738365b1bb8 Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Thu, 15 Nov 2018 15:17:15 +0000
Subject: [PATCH] [X86] Fix MCNullStreamer support for modules with a CodeView
 flag

This fixes -filetype=null support when compiling for a Win32 target and the module has a CodeView flag.

The only places changed are the uses of getTargetStreamer function - this patch guards both of them with null checks.

Committed on behalf of @eush (Eugene Sharygin)

Differential Revision: https://reviews.llvm.org/D54008

llvm-svn: 346962
---
 llvm/lib/Target/X86/X86AsmPrinter.cpp  | 16 ++++++++--------
 llvm/test/CodeGen/X86/null-streamer.ll |  4 ++--
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/llvm/lib/Target/X86/X86AsmPrinter.cpp b/llvm/lib/Target/X86/X86AsmPrinter.cpp
index 74dbdcd..b164b4e 100644
--- a/llvm/lib/Target/X86/X86AsmPrinter.cpp
+++ b/llvm/lib/Target/X86/X86AsmPrinter.cpp
@@ -88,19 +88,19 @@ bool X86AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
 
 void X86AsmPrinter::EmitFunctionBodyStart() {
   if (EmitFPOData) {
-    X86TargetStreamer *XTS =
-        static_cast<X86TargetStreamer *>(OutStreamer->getTargetStreamer());
-    unsigned ParamsSize =
-        MF->getInfo<X86MachineFunctionInfo>()->getArgumentStackSize();
-    XTS->emitFPOProc(CurrentFnSym, ParamsSize);
+    if (auto *XTS =
+        static_cast<X86TargetStreamer *>(OutStreamer->getTargetStreamer()))
+      XTS->emitFPOProc(
+          CurrentFnSym,
+          MF->getInfo<X86MachineFunctionInfo>()->getArgumentStackSize());
   }
 }
 
 void X86AsmPrinter::EmitFunctionBodyEnd() {
   if (EmitFPOData) {
-    X86TargetStreamer *XTS =
-        static_cast<X86TargetStreamer *>(OutStreamer->getTargetStreamer());
-    XTS->emitFPOEndProc();
+    if (auto *XTS =
+            static_cast<X86TargetStreamer *>(OutStreamer->getTargetStreamer()))
+      XTS->emitFPOEndProc();
   }
 }
 
diff --git a/llvm/test/CodeGen/X86/null-streamer.ll b/llvm/test/CodeGen/X86/null-streamer.ll
index 8528be3..28a457f 100644
--- a/llvm/test/CodeGen/X86/null-streamer.ll
+++ b/llvm/test/CodeGen/X86/null-streamer.ll
@@ -14,7 +14,7 @@ define void @f1() {
 }
 
 !llvm.dbg.cu = !{!0}
-!llvm.module.flags = !{!7, !8}
+!llvm.module.flags = !{!7, !8, !9}
 
 !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: " ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2, globals: !3, imports: !2)
 !1 = !DIFile(filename: "file.c", directory: "")
@@ -25,4 +25,4 @@ define void @f1() {
 !6 = !DIBasicType(size: 32, align: 32, encoding: DW_ATE_signed)
 !7 = !{i32 2, !"Dwarf Version", i32 3}
 !8 = !{i32 1, !"Debug Info Version", i32 3}
-
+!9 = !{i32 2, !"CodeView", i32 1}
-- 
2.7.4