commit b0da094983948c8a82f1a26eaa0702920c2b2b36
author Sid Manning <sidneym@quicinc.com> Tue Mar 03 08:19:59 2020 -0600
committer Sid Manning <sidneym@quicinc.com> Thu Mar 26 17:19:46 2020 -0500
tree d0e037ba521cea8756c4673f996fea694d492779
parent 4c4b71843b6fc77b67cd98a3bfbbba67392bfc2e

[Hexagon] Add support for Linux/Musl ABI (part 2)

A continuation of https://reviews.llvm.org/D72701.  This
adds support needed in clang.

Differential Revision: https://reviews.llvm.org/D75638

clang/lib/AST/ASTContext.cpp

diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index dca6523..19f67fc 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -7795,6 +7795,57 @@
   return Context->buildImplicitTypedef(VaListTagArrayType, "__builtin_va_list");
 }
 
+static TypedefDecl *CreateHexagonBuiltinVaListDecl(const ASTContext *Context) {
+  // typedef struct __va_list_tag {
+  RecordDecl *VaListTagDecl;
+  VaListTagDecl = Context->buildImplicitRecord("__va_list_tag");
+  VaListTagDecl->startDefinition();
+
+  const size_t NumFields = 3;
+  QualType FieldTypes[NumFields];
+  const char *FieldNames[NumFields];
+
+  //   void *CurrentSavedRegisterArea;
+  FieldTypes[0] = Context->getPointerType(Context->VoidTy);
+  FieldNames[0] = "__current_saved_reg_area_pointer";
+
+  //   void *SavedRegAreaEnd;
+  FieldTypes[1] = Context->getPointerType(Context->VoidTy);
+  FieldNames[1] = "__saved_reg_area_end_pointer";
+
+  //   void *OverflowArea;
+  FieldTypes[2] = Context->getPointerType(Context->VoidTy);
+  FieldNames[2] = "__overflow_area_pointer";
+
+  // Create fields
+  for (unsigned i = 0; i < NumFields; ++i) {
+    FieldDecl *Field = FieldDecl::Create(
+        const_cast<ASTContext &>(*Context), VaListTagDecl, SourceLocation(),
+        SourceLocation(), &Context->Idents.get(FieldNames[i]), FieldTypes[i],
+        /*TInfo=*/0,
+        /*BitWidth=*/0,
+        /*Mutable=*/false, ICIS_NoInit);
+    Field->setAccess(AS_public);
+    VaListTagDecl->addDecl(Field);
+  }
+  VaListTagDecl->completeDefinition();
+  Context->VaListTagDecl = VaListTagDecl;
+  QualType VaListTagType = Context->getRecordType(VaListTagDecl);
+
+  // } __va_list_tag;
+  TypedefDecl *VaListTagTypedefDecl =
+      Context->buildImplicitTypedef(VaListTagType, "__va_list_tag");
+
+  QualType VaListTagTypedefType = Context->getTypedefType(VaListTagTypedefDecl);
+
+  // typedef __va_list_tag __builtin_va_list[1];
+  llvm::APInt Size(Context->getTypeSize(Context->getSizeType()), 1);
+  QualType VaListTagArrayType = Context->getConstantArrayType(
+      VaListTagTypedefType, Size, nullptr, ArrayType::Normal, 0);
+
+  return Context->buildImplicitTypedef(VaListTagArrayType, "__builtin_va_list");
+}
+
 static TypedefDecl *CreateVaListDecl(const ASTContext *Context,
                                      TargetInfo::BuiltinVaListKind Kind) {
   switch (Kind) {
@@ -7814,6 +7865,8 @@
     return CreateAAPCSABIBuiltinVaListDecl(Context);
   case TargetInfo::SystemZBuiltinVaList:
     return CreateSystemZBuiltinVaListDecl(Context);
+  case TargetInfo::HexagonBuiltinVaList:
+    return CreateHexagonBuiltinVaListDecl(Context);
   }
 
   llvm_unreachable("Unhandled __builtin_va_list type kind");