discard block comments delimited with /* */

src/asm/lexer.c

@@ -921,6 +921,33 @@ void lexer_DumpStringExpansions(void)
 	free(stack);
 }
 
+/* Discards an block comment */
+static void discardBlockComment(void)
+{
+	dbgPrint("Discarding block comment\n");
+	for (;;) {
+		switch (nextChar()) {
+		case EOF:
+			error("Unterminated block comment\n");
+			return;
+		case '/':
+			if (peek(0) == '*') {
+				warning(WARNING_NESTED_COMMENT,
+					"/* in block comment\n");
+			}
+			continue;
+		case '*':
+			if (peek(0) == '/') {
+				shiftChars(1);
+				return;
+			}
+			/* fallthrough */
+		default:
+			continue;
+		}
+	}
+}
+
 /* Function to discard all of a line's comments */
 
 static void discardComment(void)
@@ -1476,8 +1503,6 @@ static int yylex_NORMAL(void)
 			return T_OP_ADD;
 		case '-':
 			return T_OP_SUB;
-		case '/':
-			return T_OP_DIV;
 		case '~':
 			return T_OP_NOT;
 
@@ -1498,7 +1523,14 @@ static int yylex_NORMAL(void)
 
 		/* Handle ambiguous 1- or 2-char tokens */
 		char secondChar;
-
+		case '/': /* Either division or a block comment */
+			secondChar = peek(0);
+			if (secondChar == '*') {
+				shiftChars(1);
+				discardBlockComment();
+				break;
+			}
+			return T_OP_DIV;
 		case '|': /* Either binary or logical OR */
 			secondChar = peek(0);
 			if (secondChar == '|') {

src/asm/warning.c

@@ -36,6 +36,7 @@ static enum WarningState const defaultWarnings[NB_WARNINGS] = {
 	[WARNING_EMPTY_ENTRY]		= WARNING_DISABLED,
 	[WARNING_LARGE_CONSTANT]	= WARNING_DISABLED,
 	[WARNING_LONG_STR]		= WARNING_DISABLED,
+	[WARNING_NESTED_COMMENT]	= WARNING_ENABLED,
 	[WARNING_OBSOLETE]		= WARNING_ENABLED,
 	[WARNING_SHIFT]			= WARNING_DISABLED,
 	[WARNING_SHIFT_AMOUNT]		= WARNING_DISABLED,
@@ -75,6 +76,7 @@ static char const *warningFlags[NB_WARNINGS_ALL] = {
 	"empty-entry",
 	"large-constant",
 	"long-string",
+	"nested-comment",
 	"obsolete",
 	"shift",
 	"shift-amount",
@@ -104,6 +106,7 @@ static uint8_t const _wallCommands[] = {
 /* Warnings that are less likely to indicate an error */
 static uint8_t const _wextraCommands[] = {
 	WARNING_EMPTY_ENTRY,
+	WARNING_NESTED_COMMENT,
 	META_WARNING_DONE
 };
 
@@ -115,6 +118,7 @@ static uint8_t const _weverythingCommands[] = {
 	WARNING_EMPTY_ENTRY,
 	WARNING_LARGE_CONSTANT,
 	WARNING_LONG_STR,
+	WARNING_NESTED_COMMENT,
 	WARNING_OBSOLETE,
 	WARNING_SHIFT,
 	WARNING_SHIFT_AMOUNT,