[clang-repl] Lay the basic infrastructure for pretty printing of types (#148701)

The idea is to store a type-value pair in clang::Value which is updated
by the interpreter runtime. The class copies builtin types and boxes
non-builtin types to provide some lifetime control.

The patch enables default printers for C and C++ using a very
minimalistic approach. We handle enums, arrays and user types. Once we
land this we can focus on enabling user-defined pretty-printers which
take control over printing of types

The work started as part of https://reviews.llvm.org/D146809, then we
created a giant in https://github.com/llvm/llvm-project/pull/84769

1 files changed, 20 insertions, 0 deletions

diff --git a/clang/unittests/Interpreter/InterpreterTest.cpp b/clang/unittests/Interpreter/InterpreterTest.cpp
index b97f5ae..8711f66 100644
--- a/clang/unittests/Interpreter/InterpreterTest.cpp
+++ b/clang/unittests/Interpreter/InterpreterTest.cpp
@@ -389,6 +389,26 @@ TEST_F(InterpreterTest, Value) {
   EXPECT_TRUE(V9.getType()->isMemberFunctionPointerType());
   EXPECT_EQ(V9.getKind(), Value::K_PtrOrObj);
   EXPECT_TRUE(V9.isManuallyAlloc());
+
+  Value V10;
+  llvm::cantFail(Interp->ParseAndExecute(
+      "enum D : unsigned int {Zero = 0, One}; One", &V10));
+
+  std::string prettyType;
+  llvm::raw_string_ostream OSType(prettyType);
+  V10.printType(OSType);
+  EXPECT_STREQ(prettyType.c_str(), "D");
+
+  // FIXME: We should print only the value or the constant not the type.
+  std::string prettyData;
+  llvm::raw_string_ostream OSData(prettyData);
+  V10.printData(OSData);
+  EXPECT_STREQ(prettyData.c_str(), "(One) : unsigned int 1");
+
+  std::string prettyPrint;
+  llvm::raw_string_ostream OSPrint(prettyPrint);
+  V10.print(OSPrint);
+  EXPECT_STREQ(prettyPrint.c_str(), "(D) (One) : unsigned int 1\n");
 }
 
 TEST_F(InterpreterTest, TranslationUnit_CanonicalDecl) {