[MC] Untangle MCContext and MCObjectFileInfo

This untangles the MCContext and the MCObjectFileInfo. There is a circular
dependency between MCContext and MCObjectFileInfo. Currently this dependency
also exists during construction: You can't contruct a MOFI without a MCContext
without constructing the MCContext with a dummy version of that MOFI first.
This removes this dependency during construction. In a perfect world,
MCObjectFileInfo wouldn't depend on MCContext at all, but only be stored in the
MCContext, like other MC information. This is future work.

This also shifts/adds more information to the MCContext making it more
available to the different targets. Namely:

- TargetTriple
- ObjectFileType
- SubtargetInfo

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D101462

1 files changed, 6 insertions, 3 deletions

diff --git a/llvm/unittests/CodeGen/MachineInstrTest.cpp b/llvm/unittests/CodeGen/MachineInstrTest.cpp
index 7c9faec..1616311 100644
--- a/llvm/unittests/CodeGen/MachineInstrTest.cpp
+++ b/llvm/unittests/CodeGen/MachineInstrTest.cpp
@@ -6,8 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineMemOperand.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
@@ -33,8 +34,10 @@ namespace {
 #include "MFCommon.inc"
 
 std::unique_ptr<MCContext> createMCContext(MCAsmInfo *AsmInfo) {
-  return std::make_unique<MCContext>(
-      AsmInfo, nullptr, nullptr, nullptr, nullptr, false);
+  Triple TheTriple(/*ArchStr=*/"", /*VendorStr=*/"", /*OSStr=*/"",
+                   /*EnvironmentStr=*/"elf");
+  return std::make_unique<MCContext>(TheTriple, AsmInfo, nullptr, nullptr,
+                                     nullptr, nullptr, nullptr, false);
 }
 
 // This test makes sure that MachineInstr::isIdenticalTo handles Defs correctly