[Clang Interpreter] Initial patch for the constexpr interpreter

Summary:
This patch introduces the skeleton of the constexpr interpreter,
capable of evaluating a simple constexpr functions consisting of
if statements. The interpreter is described in more detail in the
RFC. Further patches will add more features.

Reviewers: Bigcheese, jfb, rsmith

Subscribers: bruno, uenoku, ldionne, Tyker, thegameg, tschuett, dexonsmith, mgorny, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D64146

llvm-svn: 370636

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/utils/TableGen/TableGen.cpp b/clang/utils/TableGen/TableGen.cpp
index b9ec90fd5bc..a9237001933 100644
--- a/clang/utils/TableGen/TableGen.cpp
+++ b/clang/utils/TableGen/TableGen.cpp
@@ -47,6 +47,7 @@ enum ActionType {
   GenClangCommentNodes,
   GenClangDeclNodes,
   GenClangStmtNodes,
+  GenClangOpcodes,
   GenClangSACheckers,
   GenClangCommentHTMLTags,
   GenClangCommentHTMLTagsProperties,
@@ -129,6 +130,8 @@ cl::opt<ActionType> Action(
                    "Generate Clang AST declaration nodes"),
         clEnumValN(GenClangStmtNodes, "gen-clang-stmt-nodes",
                    "Generate Clang AST statement nodes"),
+        clEnumValN(GenClangOpcodes, "gen-clang-opcodes",
+                   "Generate Clang constexpr interpreter opcodes"),
         clEnumValN(GenClangSACheckers, "gen-clang-sa-checkers",
                    "Generate Clang Static Analyzer checkers"),
         clEnumValN(GenClangCommentHTMLTags, "gen-clang-comment-html-tags",
@@ -251,6 +254,9 @@ bool ClangTableGenMain(raw_ostream &OS, RecordKeeper &Records) {
   case GenClangStmtNodes:
     EmitClangASTNodes(Records, OS, "Stmt", "");
     break;
+  case GenClangOpcodes:
+    EmitClangOpcodes(Records, OS);
+    break;
   case GenClangSACheckers:
     EmitClangSACheckers(Records, OS);
     break;