[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, 8 insertions, 0 deletions

diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index 063c202cb63..dd88c919669 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -12,6 +12,7 @@
 
 #include "clang/AST/ASTContext.h"
 #include "CXXABI.h"
+#include "Interp/Context.h"
 #include "clang/AST/APValue.h"
 #include "clang/AST/ASTMutationListener.h"
 #include "clang/AST/ASTTypeTraits.h"
@@ -783,6 +784,13 @@ CXXABI *ASTContext::createCXXABI(const TargetInfo &T) {
   llvm_unreachable("Invalid CXXABI type!");
 }
 
+interp::Context &ASTContext::getInterpContext() {
+  if (!InterpContext) {
+    InterpContext.reset(new interp::Context(*this));
+  }
+  return *InterpContext.get();
+}
+
 static const LangASMap *getAddressSpaceMap(const TargetInfo &T,
                                            const LangOptions &LOpts) {
   if (LOpts.FakeAddressSpaceMap) {