[codeview] Add DISubprogram::ThisAdjustment

Summary:
This represents the adjustment applied to the implicit 'this' parameter
in the prologue of a virtual method in the MS C++ ABI. The adjustment is
always zero unless multiple inheritance is involved.

This increases the size of DISubprogram by 8 bytes, unfortunately. The
adjustment really is a signed 32-bit integer. If this size increase is
too much, we could probably win it back by splitting out a subclass with
info specific to virtual methods (virtuality, vindex, thisadjustment,
containingType).

Reviewers: aprantl, dexonsmith

Subscribers: aaboud, amccarth, llvm-commits

Differential Revision: http://reviews.llvm.org/D21614

llvm-svn: 274325

1 files changed, 8 insertions, 7 deletions

diff --git a/llvm/lib/IR/DIBuilder.cpp b/llvm/lib/IR/DIBuilder.cpp
index ce16fdd..faf6bf7 100644
--- a/llvm/lib/IR/DIBuilder.cpp
+++ b/llvm/lib/IR/DIBuilder.cpp
@@ -667,8 +667,8 @@ DISubprogram *DIBuilder::createFunction(
   auto *Node = getSubprogram(
       /* IsDistinct = */ isDefinition, VMContext,
       getNonCompileUnitScope(Context), Name, LinkageName, File, LineNo, Ty,
-      isLocalToUnit, isDefinition, ScopeLine, nullptr, 0, 0, Flags, isOptimized,
-      isDefinition ? CUNode : nullptr, TParams, Decl,
+      isLocalToUnit, isDefinition, ScopeLine, nullptr, 0, 0, 0, Flags,
+      isOptimized, isDefinition ? CUNode : nullptr, TParams, Decl,
       MDTuple::getTemporary(VMContext, None).release());
 
   if (isDefinition)
@@ -685,8 +685,8 @@ DISubprogram *DIBuilder::createTempFunctionFwdDecl(
   return DISubprogram::getTemporary(
              VMContext, getNonCompileUnitScope(Context), Name, LinkageName,
              File, LineNo, Ty, isLocalToUnit, isDefinition, ScopeLine, nullptr,
-             0, 0, Flags, isOptimized, isDefinition ? CUNode : nullptr, TParams,
-             Decl, nullptr)
+             0, 0, 0, Flags, isOptimized, isDefinition ? CUNode : nullptr,
+             TParams, Decl, nullptr)
       .release();
 }
 
@@ -694,8 +694,9 @@ DISubprogram *
 DIBuilder::createMethod(DIScope *Context, StringRef Name, StringRef LinkageName,
                         DIFile *F, unsigned LineNo, DISubroutineType *Ty,
                         bool isLocalToUnit, bool isDefinition, unsigned VK,
-                        unsigned VIndex, DIType *VTableHolder, unsigned Flags,
-                        bool isOptimized, DITemplateParameterArray TParams) {
+                        unsigned VIndex, int ThisAdjustment,
+                        DIType *VTableHolder, unsigned Flags, bool isOptimized,
+                        DITemplateParameterArray TParams) {
   assert(getNonCompileUnitScope(Context) &&
          "Methods should have both a Context and a context that isn't "
          "the compile unit.");
@@ -703,7 +704,7 @@ DIBuilder::createMethod(DIScope *Context, StringRef Name, StringRef LinkageName,
   auto *SP = getSubprogram(
       /* IsDistinct = */ isDefinition, VMContext, cast<DIScope>(Context), Name,
       LinkageName, F, LineNo, Ty, isLocalToUnit, isDefinition, LineNo,
-      VTableHolder, VK, VIndex, Flags, isOptimized,
+      VTableHolder, VK, VIndex, ThisAdjustment, Flags, isOptimized,
       isDefinition ? CUNode : nullptr, TParams, nullptr, nullptr);
 
   if (isDefinition)