[OpaquePtr][LLParser] Automatically detect opaque pointers in .ll files

This allows us to not have to specify -opaque-pointers when updating
IR tests from typed pointers to opaque pointers.

We detect opaque pointers in .ll files by looking for relevant tokens,
either "ptr" or "*".

Reviewed By: #opaque-pointers, nikic

Differential Revision: https://reviews.llvm.org/D119482

1 files changed, 4 insertions, 1 deletions

diff --git a/llvm/lib/AsmParser/LLLexer.cpp b/llvm/lib/AsmParser/LLLexer.cpp
index 6048066..8aac5a6 100644
--- a/llvm/lib/AsmParser/LLLexer.cpp
+++ b/llvm/lib/AsmParser/LLLexer.cpp
@@ -860,7 +860,10 @@ lltok::Kind LLLexer::LexIdentifier() {
   TYPEKEYWORD("token",     Type::getTokenTy(Context));
 
   if (Keyword == "ptr") {
-    if (Context.supportsTypedPointers()) {
+    // enableOpaquePointers() must be called before creating any pointer types.
+    if (!Context.hasSetOpaquePointersValue()) {
+      Context.enableOpaquePointers();
+    } else if (Context.supportsTypedPointers()) {
       Warning("ptr type is only supported in -opaque-pointers mode");
       return lltok::Error;
     }