[DebugInfo] Add calling convention support for DWARF and CodeView

Summary:
Now DISubroutineType has a 'cc' field which should be a DW_CC_ enum.  If
it is present and non-zero, the backend will emit it as a
DW_AT_calling_convention attribute. On the CodeView side, we translate
it to the appropriate enum for the LF_PROCEDURE record.

I added a new LLVM vendor specific enum to the list of DWARF calling
conventions. DWARF does not appear to attempt to standardize these, so I
assume it's OK to do this until we coordinate with GCC on how to emit
vectorcall convention functions.

Reviewers: dexonsmith, majnemer, aaboud, amccarth

Subscribers: mehdi_amini, llvm-commits

Differential Revision: http://reviews.llvm.org/D21114

llvm-svn: 272197

1 files changed, 4 insertions, 3 deletions

diff --git a/llvm/lib/IR/DebugInfoMetadata.cpp b/llvm/lib/IR/DebugInfoMetadata.cpp
index 81e20f4e1b9..4cbe838f87d 100644
--- a/llvm/lib/IR/DebugInfoMetadata.cpp
+++ b/llvm/lib/IR/DebugInfoMetadata.cpp
@@ -327,12 +327,13 @@ DICompositeType *DICompositeType::getODRTypeIfExists(LLVMContext &Context,
 }
 
 DISubroutineType *DISubroutineType::getImpl(LLVMContext &Context,
-                                            unsigned Flags, Metadata *TypeArray,
+                                            unsigned Flags, uint8_t CC,
+                                            Metadata *TypeArray,
                                             StorageType Storage,
                                             bool ShouldCreate) {
-  DEFINE_GETIMPL_LOOKUP(DISubroutineType, (Flags, TypeArray));
+  DEFINE_GETIMPL_LOOKUP(DISubroutineType, (Flags, CC, TypeArray));
   Metadata *Ops[] = {nullptr, nullptr, nullptr, TypeArray};
-  DEFINE_GETIMPL_STORE(DISubroutineType, (Flags), Ops);
+  DEFINE_GETIMPL_STORE(DISubroutineType, (Flags, CC), Ops);
 }
 
 DIFile *DIFile::getImpl(LLVMContext &Context, MDString *Filename,