[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

Author: RKSimon

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();
  }
 }
 

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}