Report invalid octal numbers correctly.

Previously, we'd report them as an overflowed integer.

Change-Id: Ia3632b4bc880829fb04b08a002d7ce9523567a54
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/472056
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>

src/sksl/SkSLDSLParser.cpp

@@ -114,12 +114,32 @@ DSLParser::DSLParser(Compiler* compiler, const ProgramSettings& settings, Progra
 }
 
 Token DSLParser::nextRawToken() {
+    Token token;
     if (fPushback.fKind != Token::Kind::TK_NONE) {
-        Token result = fPushback;
+        // Retrieve the token from the pushback buffer.
+        token = fPushback;
         fPushback.fKind = Token::Kind::TK_NONE;
-        return result;
+    } else {
+        // Fetch a token from the lexer.
+        token = fLexer.next();
+
+        // Some tokens are always invalid, so we detect and report them here.
+        switch (token.fKind) {
+            case Token::Kind::TK_RESERVED:
+                this->error(token, "'" + this->text(token) + "' is a reserved word");
+                token.fKind = Token::Kind::TK_IDENTIFIER;  // reduces additional follow-up errors
+                break;
+
+            case Token::Kind::TK_BAD_OCTAL:
+                this->error(token, "'" + this->text(token) + "' is not a valid octal number");
+                break;
+
+            default:
+                break;
+        }
     }
-    return fLexer.next();
+
+    return token;
 }
 
 Token DSLParser::nextToken() {
@@ -131,11 +151,6 @@ Token DSLParser::nextToken() {
             case Token::Kind::TK_BLOCK_COMMENT:
                 continue;
 
-            case Token::Kind::TK_RESERVED:
-                this->error(token, "'" + this->text(token) + "' is a reserved word");
-                token.fKind = Token::Kind::TK_IDENTIFIER;
-                [[fallthrough]];
-
             default:
                 return token;
         }

src/sksl/SkSLLexer.h

@@ -19,6 +19,7 @@ struct Token {
         TK_END_OF_FILE,
         TK_FLOAT_LITERAL,
         TK_INT_LITERAL,
+        TK_BAD_OCTAL,
         TK_TRUE_LITERAL,
         TK_FALSE_LITERAL,
         TK_IF,

src/sksl/generated/sksl_public.dehydrated.sksl

@@ -2460,7 +2460,7 @@ static uint8_t SKSL_INCLUDE_sksl_public[] = {199,3,
 46,23,2,2,
 1,
 45,
-55,149,2,0,3,0,1,2,51,
+55,149,2,0,3,0,1,2,52,
 27,
 46,153,0,185,0,2,
 45,
@@ -2477,7 +2477,7 @@ static uint8_t SKSL_INCLUDE_sksl_public[] = {199,3,
 46,18,2,2,
 1,
 45,
-55,151,2,0,3,0,1,2,51,
+55,151,2,0,3,0,1,2,52,
 27,
 46,145,0,177,0,2,
 45,

src/sksl/lex/sksl.lex

@@ -10,7 +10,8 @@
 //    rebuild, and then set it back to 1.
 
 FLOAT_LITERAL  = [0-9]*\.[0-9]+([eE][+-]?[0-9]+)?|[0-9]+\.[0-9]*([eE][+-]?[0-9]+)?|[0-9]+([eE][+-]?[0-9]+)
-INT_LITERAL    = ([0-9]+|0[xX][0-9a-fA-F]+)[uU]?
+INT_LITERAL    = ([1-9][0-9]*|0[0-7]*|0[xX][0-9a-fA-F]+)[uU]?
+BAD_OCTAL      = (0[0-9]+)[uU]?
 TRUE_LITERAL   = "true"
 FALSE_LITERAL  = "false"
 IF             = "if"

tests/sksl/errors/BadOctal.glsl

@@ -1,5 +1,5 @@
 ### Compilation failed:
 
-error: 1: integer is too large: 08
-error: 2: integer is too large: 012349
+error: 1: '08' is not a valid octal number
+error: 1: expected expression, but found '08'
 2 errors