[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
diff --git a/llvm/tools/llvm-rc/ResourceScriptParser.h b/llvm/tools/llvm-rc/ResourceScriptParser.h
index 132106f..56042f7 100644
--- a/llvm/tools/llvm-rc/ResourceScriptParser.h
+++ b/llvm/tools/llvm-rc/ResourceScriptParser.h
@@ -77,12 +77,18 @@
// The following methods try to read a single token, check if it has the
// correct type and then parse it.
+ // Each integer can be written as an arithmetic expression producing an
+ // unsigned 32-bit integer.
Expected<uint32_t> readInt(); // Parse an integer.
Expected<StringRef> readString(); // Parse a string.
Expected<StringRef> readIdentifier(); // Parse an identifier.
Expected<IntOrString> readIntOrString(); // Parse an integer or a string.
Expected<IntOrString> readTypeOrName(); // Parse an integer or an identifier.
+ // Helper integer expression parsing methods.
+ Expected<uint32_t> parseIntExpr1();
+ Expected<uint32_t> parseIntExpr2();
+
// Advance the state by one, discarding the current token.
// If the discarded token had an incorrect type, fail.
Error consumeType(Kind TokenKind);