[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: 370584

utils/gn/secondary/clang/lib/AST/BUILD.gn

@@ -10,6 +10,7 @@ static_library("AST") {
     "//clang/include/clang/AST:CommentHTMLTags",
     "//clang/include/clang/AST:CommentHTMLTagsProperties",
     "//clang/include/clang/AST:DeclNodes",
+    "//clang/lib/AST/Interp",
     "//clang/lib/Basic",
     "//clang/lib/Lex",
     "//llvm/lib/BinaryFormat",

utils/gn/secondary/clang/lib/AST/Interp/BUILD.gn

@@ -0,0 +1,39 @@
+import("//clang/utils/TableGen/clang_tablegen.gni")
+
+clang_tablegen("Opcodes") {
+  args = [ "-gen-clang-opcodes" ]
+  td_file = "Opcodes.td"
+}
+
+static_library("Interp") {
+  output_name = "clangInterp"
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/AST/Interp:Opcodes",
+    "//clang/lib/Basic",
+    "//llvm/lib/Support",
+  ]
+  sources = [
+    "Block.cpp",
+    "ByteCodeEmitter.cpp",
+    "ByteCodeExprGen.cpp",
+    "ByteCodeGenError.cpp",
+    "ByteCodeStmtGen.cpp",
+    "Context.cpp",
+    "Descriptor.cpp",
+    "Disasm.cpp",
+    "EvalEmitter.cpp",
+    "Frame.cpp",
+    "Function.cpp",
+    "Interp.cpp",
+    "InterpFrame.cpp",
+    "InterpStack.cpp",
+    "InterpState.cpp",
+    "Pointer.cpp",
+    "Program.cpp",
+    "Record.cpp",
+    "Source.cpp",
+    "State.cpp",
+    "Type.cpp",
+  ]
+}

utils/gn/secondary/clang/utils/TableGen/BUILD.gn

@@ -14,6 +14,7 @@ executable("clang-tblgen") {
     "ClangOpenCLBuiltinEmitter.cpp",
     "ClangOptionDocEmitter.cpp",
     "ClangSACheckersEmitter.cpp",
+    "ClangOpcodesEmitter.cpp",
     "NeonEmitter.cpp",
     "TableGen.cpp",
   ]