Actually respect suffixes on numeric literals.

- Add logic to extract the value and suffix from a numeric literal
  - This duplicates some of the lexing logic, but this is hard to avoid without redundant runtime work

- Note that I'm not using and stdlib string-to-number code. This should be more robust once it is working, but it is obviously error prone in the near term. The main up-sides to this are:
  - We can handle binary integer literals
  - We can handle hexadecimal floating-point literals without stdlib support
  - We can hypothetically support digit separators, if we ever wanted

- The parser looks at the suffix characters sliced off by the lexer, and tries to pick a type to use for a literal
  - It uses `NULL` if there is no suffix, to avoid some nasty order dependencies where the stdlib might need to parse a number before it has seen the definition of `int`
  - Right now I only handle a few cases, so there may be bugs lurking here

- The emit logic needs to handle the fact that a literal node in the AST might have a non-default type attached.
  - Right now I just quickly check for the most likely types, and emit the literal with a matching suffix. This doesn't seem robust if any source language supports a suffix for a type where a target has no corresponding suffix. In the long term some amount of casting is probably required.

1 files changed, 6 insertions, 0 deletions

diff --git a/source/slang/lexer.h b/source/slang/lexer.h
index 5bcfc0f4a..53bfc0999 100644
--- a/source/slang/lexer.h
+++ b/source/slang/lexer.h
@@ -91,6 +91,12 @@ namespace Slang
     // Helper routines for extracting values from tokens
     String getStringLiteralTokenValue(Token const& token);
     String getFileNameTokenValue(Token const& token);
+
+    typedef unsigned long long IntegerLiteralValue;
+    typedef double FloatingPointLiteralValue;
+
+    IntegerLiteralValue getIntegerLiteralValue(Token const& token, String* outSuffix = 0);
+    FloatingPointLiteralValue getFloatingPointLiteralValue(Token const& token, String* outSuffix = 0);
 }
 
 #endif
\ No newline at end of file