[llvm-rc] Add integer expressions parsing ability. [7/8]

This allows the ints to be written as integer expressions evaluating to
unsigned 16-bit/32-bit integers.

All the expressions may use the following operators: + - & | ~, and
parentheses. Minus token - can be also unary. There is no precedence of
the operators other than the unary operators binding stronger than their
binary counterparts.

Differential Revision: https://reviews.llvm.org/D37022

llvm-svn: 314477

1 files changed, 12 insertions, 0 deletions

diff --git a/llvm/tools/llvm-rc/ResourceScriptToken.cpp b/llvm/tools/llvm-rc/ResourceScriptToken.cpp
index ba1ed5d416a..df9e3d9caab 100644
--- a/llvm/tools/llvm-rc/ResourceScriptToken.cpp
+++ b/llvm/tools/llvm-rc/ResourceScriptToken.cpp
@@ -60,6 +60,18 @@ StringRef RCToken::value() const { return TokenValue; }
 
 Kind RCToken::kind() const { return TokenKind; }
 
+bool RCToken::isBinaryOp() const {
+  switch (TokenKind) {
+  case Kind::Plus:
+  case Kind::Minus:
+  case Kind::Pipe:
+  case Kind::Amp:
+    return true;
+  default:
+    return false;
+  }
+}
+
 static Error getStringError(const Twine &message) {
   return make_error<StringError>("Error parsing file: " + message,
                                  inconvertibleErrorCode());