IR: Stop abusing DW_TAG_base_type for compile unit arrays

The sub-arrays for compile units have for a long time been initialized
to distinct temporary nodes with the `DW_TAG_base_type` tag, with no
other operands.  These invalid `DIBasicType`s are later replaced with
appropriate arrays.

This seems like a poor man's assertion that the arrays do eventually get
replaced.  These days, temporaries in the graph will cause assertions
when writing bitcode or assembly, so this isn't necessary.  Use
temporary empty tuples instead.

Note that the whole idea of using temporaries and then replacing them
later is wasteful here.  We never actually want to merge compile units
by uniquing based on content.  Compile units should use `getDistinct()`
instead of `get()`, and then their operands can be freely replaced later
on.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228967 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/IR/DIBuilder.cpp b/lib/IR/DIBuilder.cpp
index 5217a4e..3394cff 100644 (file)
--- a/lib/IR/DIBuilder.cpp
+++ b/lib/IR/DIBuilder.cpp
@@ -150,16 +150,14 @@ DICompileUnit DIBuilder::createCompileUnit(unsigned Lang, StringRef Filename,
          "Invalid Language tag");
   assert(!Filename.empty() &&
          "Unable to create compile unit without filename");
-  Metadata *TElts[] = {HeaderBuilder::get(DW_TAG_base_type).get(VMContext)};
-  TempEnumTypes = MDNode::getTemporary(VMContext, TElts).release();
 
-  TempRetainTypes = MDNode::getTemporary(VMContext, TElts).release();
-
-  TempSubprograms = MDNode::getTemporary(VMContext, TElts).release();
-
-  TempGVs = MDNode::getTemporary(VMContext, TElts).release();
-
-  TempImportedModules = MDNode::getTemporary(VMContext, TElts).release();
+  // TODO: Once we make MDCompileUnit distinct, stop using temporaries here
+  // (just start with operands assigned to nullptr).
+  TempEnumTypes = MDTuple::getTemporary(VMContext, None).release();
+  TempRetainTypes = MDTuple::getTemporary(VMContext, None).release();
+  TempSubprograms = MDTuple::getTemporary(VMContext, None).release();
+  TempGVs = MDTuple::getTemporary(VMContext, None).release();
+  TempImportedModules = MDTuple::getTemporary(VMContext, None).release();
 
   Metadata *Elts[] = {HeaderBuilder::get(dwarf::DW_TAG_compile_unit)
                           .concat(Lang)
@@ -174,6 +172,8 @@ DICompileUnit DIBuilder::createCompileUnit(unsigned Lang, StringRef Filename,
                       TempEnumTypes, TempRetainTypes, TempSubprograms, TempGVs,
                       TempImportedModules};
 
+  // TODO: Switch to getDistinct().  We never want to merge compile units based
+  // on contents.
   MDNode *CUNode = MDNode::get(VMContext, Elts);
 
   // Create a named metadata so that it is easier to find cu in a module.