Parse hex literals

ml-proto/src/host/lexer.mll

@@ -97,7 +97,8 @@ let escape = ['n''t''\\''\'''\"']
 let character = [^'"''\\''\n'] | '\\'escape | '\\'hexdigit hexdigit
 
 let num = ('+' | '-')? digit+
-let int = num
+let hexnum = ('+' | '-')? "0x" hexdigit+
+let int = num | hexnum
 let float = (num '.' digit+) | num ('.' digit+)? ('e' | 'E') num
 let text = '"' character* '"'
 let name = '$' (letter | digit | '_' | tick | symbol)+

ml-proto/test/hexnum.wasm

@@ -0,0 +1,39 @@
+(module
+  (func $test32 (result i32)
+    (return (i32.const 0x0badd00d))
+  )
+
+  (func $max32 (result i32)
+    (return (i32.const 0xffffffff))
+  )
+
+  (func $neg32 (result i32)
+    (return (i32.const -0x7fffffff))
+  )
+
+  (func $test64 (result i64)
+    (return (i64.const 0x0cabba6e0ba66a6e))
+  )
+
+  (func $max64 (result i64)
+    (return (i64.const 0xffffffffffffffff))
+  )
+
+  (func $neg64 (result i64)
+    (return (i64.const -0x7fffffffffffffff))
+  )
+
+  (export "test32" $test32)
+  (export "max32" $max32)
+  (export "neg32" $neg32)
+  (export "test64" $test64)
+  (export "max64" $max64)
+  (export "neg64" $neg64)
+)
+
+(assert_eq (invoke "test32") (i32.const 195940365))
+(assert_eq (invoke "max32") (i32.const -1))
+(assert_eq (invoke "neg32") (i32.const -2147483647))
+(assert_eq (invoke "test64") (i64.const 913028331277281902))
+(assert_eq (invoke "max64") (i64.const -1))
+(assert_eq (invoke "neg64") (i64.const -9223372036854775807))