fix select grammar (#98)

Author: butterunderflow

benchmarks/wasm/select.wat

@@ -0,0 +1,34 @@
+(module
+  (type (;0;) (func (param i32)))
+  (type (;1;) (func))
+  (import "console" "assert" (func (;0;) (type 0)))
+  (func (;1;) (type 1)
+    i32.const 11
+    i32.const 22
+    i32.const 1
+    select
+    i32.const 11
+    i32.eq
+    call 0
+    i64.const 33
+    i64.const 44
+    i32.const 0
+    select
+    i64.const 44
+    i64.eq
+    call 0
+    f32.const 0x1.6p+2 (;=5.5;)
+    f32.const 0x1.ap+2 (;=6.5;)
+    i32.const 1
+    select
+    f32.const 0x1.6p+2 (;=5.5;)
+    f32.eq
+    call 0
+    f64.const 0x1.dp+2 (;=7.25;)
+    f64.const 0x1.08p+3 (;=8.25;)
+    i32.const 0
+    select
+    f64.const 0x1.08p+3 (;=8.25;)
+    f64.eq
+    call 0)
+  (export "real_main" (func 1)))

grammar/Makefile

@@ -1,5 +1,5 @@
 # Download ANTLR from https://www.antlr.org/download.html
-ANTLR4 = antlr-4.12.0-complete.jar
+ANTLR4 = antlr-4.13.0-complete.jar
 
 llvm:
 	java -jar $(ANTLR4) LLVMLexer.g4

grammar/WatLexer.g4

@@ -70,7 +70,7 @@ RETURN: 'return' ;
 IF: 'if' ;
 THEN: 'then' ;
 ELSE: 'else' ;
-SELECT: '.select' ;
+SELECT: 'select' ;
 CALL: 'call' ;
 CALL_INDIRECT: 'call_indirect' ;
 RETURN_CALL: 'return_call' ;

grammar/WatParser.g4

@@ -204,7 +204,7 @@ store
 ;
 
 selectInstr
-  : numType SELECT
+  : SELECT
 ;
 
 callIndirectInstr