[PATCH] D141194: [clang][Interp] Implement bitcasts

[Timm Bäder via Phabricator via cfe-commits]

tbaeder created this revision.
tbaeder added reviewers: aaron.ballman, erichkeane, tahonermann, shafik.
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tbaeder requested review of this revision.
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I really don't know much about these, so limited tests included.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D141194

Files:
  clang/lib/AST/Interp/ByteCodeExprGen.cpp
  clang/test/AST/Interp/literals.cpp


Index: clang/test/AST/Interp/literals.cpp
===================================================================
--- clang/test/AST/Interp/literals.cpp
+++ clang/test/AST/Interp/literals.cpp
@@ -90,6 +90,11 @@
 static_assert(p != nullptr, "");
 static_assert(*p == 10, "");
 
+constexpr const void *cp = (void *)p;
+// FIXME: This should be an error in the new interpreter.
+constexpr const int *pm = (int*)cp; // ref-error {{ must be initialized by a constant expression}} \
+                                    // ref-note {{cast from 'const void *' is not allowed}}
+
 constexpr const int* getIntPointer() {
   return &m;
 }
Index: clang/lib/AST/Interp/ByteCodeExprGen.cpp
===================================================================
--- clang/lib/AST/Interp/ByteCodeExprGen.cpp
+++ clang/lib/AST/Interp/ByteCodeExprGen.cpp
@@ -150,6 +150,7 @@
   case CK_NonAtomicToAtomic:
   case CK_NoOp:
   case CK_UserDefinedConversion:
+  case CK_BitCast:
     return this->visit(SubExpr);
 
   case CK_IntegralToBoolean:


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