Bug 1326454 - Rename TokenStream::getBracedUnicode to TokenStream::matchBracedUnicode and make its signature fallible. r=arai

--HG--
extra : rebase_source : 18eedfc991915a241132960cf42efece21330a7f

js/src/frontend/TokenStream.cpp

@@ -815,6 +815,19 @@ TokenStream::error(unsigned errorNumber, ...)
     va_end(args);
 }
 
+void
+TokenStream::errorAt(uint32_t offset, unsigned errorNumber, ...)
+{
+    va_list args;
+    va_start(args, errorNumber);
+#ifdef DEBUG
+    bool result =
+#endif
+        reportCompileErrorNumberVA(offset, JSREPORT_ERROR, errorNumber, args);
+    MOZ_ASSERT(!result, "reporting an error returned true?");
+    va_end(args);
+}
+
 // We have encountered a '\': check for a Unicode escape sequence after it.
 // Return the length of the escape sequence and the character code point (by
 // value) if we found a Unicode escape sequence.  Otherwise, return 0.  In both
@@ -1863,32 +1876,48 @@ TokenStream::getTokenInternal(TokenKind* ttp, Modifier modifier)
 }
 
 bool
-TokenStream::getBracedUnicode(uint32_t* cp)
+TokenStream::matchBracedUnicode(bool* matched, uint32_t* cp)
 {
+    if (peekChar() != '{') {
+        *matched = false;
+        return true;
+    }
+
     consumeKnownChar('{');
 
+    uint32_t start = userbuf.offset();
+
     bool first = true;
-    int32_t c;
     uint32_t code = 0;
-    while (true) {
-        c = getCharIgnoreEOL();
-        if (c == EOF)
+    do {
+        int32_t c = getCharIgnoreEOL();
+        if (c == EOF) {
+            error(JSMSG_MALFORMED_ESCAPE, "Unicode");
             return false;
+        }
         if (c == '}') {
-            if (first)
+            if (first) {
+                error(JSMSG_MALFORMED_ESCAPE, "Unicode");
                 return false;
+            }
             break;
         }
 
-        if (!JS7_ISHEX(c))
+        if (!JS7_ISHEX(c)) {
+            error(JSMSG_MALFORMED_ESCAPE, "Unicode");
             return false;
+        }
 
         code = (code << 4) | JS7_UNHEX(c);
-        if (code > unicode::NonBMPMax)
+        if (code > unicode::NonBMPMax) {
+            errorAt(start, JSMSG_UNICODE_OVERFLOW, "escape sequence");
             return false;
-        first = false;
-    }
+        }
 
+        first = false;
+    } while (true);
+
+    *matched = true;
     *cp = code;
     return true;
 }
@@ -1930,13 +1959,11 @@ TokenStream::getStringOrTemplateToken(int untilChar, Token** tp)
 
               // Unicode character specification.
               case 'u': {
-                if (peekChar() == '{') {
-                    uint32_t code;
-                    if (!getBracedUnicode(&code)) {
-                        error(JSMSG_MALFORMED_ESCAPE, "Unicode");
-                        return false;
-                    }
-
+                bool matched;
+                uint32_t code;
+                if (!matchBracedUnicode(&matched, &code))
+                    return false;
+                if (matched) {
                     MOZ_ASSERT(code <= unicode::NonBMPMax);
                     if (code < unicode::NonBMPMin) {
                         c = code;

js/src/frontend/TokenStream.h

@@ -368,6 +368,9 @@ class MOZ_STACK_CLASS TokenStream
     // Report the given error at the current offset.
     void error(unsigned errorNumber, ...);
 
+    // Report the given error at the given offset.
+    void errorAt(uint32_t offset, unsigned errorNumber, ...);
+
     // Warn at the current offset.
     MOZ_MUST_USE bool warning(unsigned errorNumber, ...);
 
@@ -952,7 +955,7 @@ class MOZ_STACK_CLASS TokenStream
 
     MOZ_MUST_USE bool getTokenInternal(TokenKind* ttp, Modifier modifier);
 
-    MOZ_MUST_USE bool getBracedUnicode(uint32_t* code);
+    MOZ_MUST_USE bool matchBracedUnicode(bool* matched, uint32_t* code);
     MOZ_MUST_USE bool getStringOrTemplateToken(int untilChar, Token** tp);
 
     int32_t getChar();

js/src/irregexp/RegExpParser.cpp

@@ -243,10 +243,10 @@ RegExpParser<CharT>::RegExpParser(frontend::TokenStream& ts, LifoAlloc* alloc,
 
 template <typename CharT>
 RegExpTree*
-RegExpParser<CharT>::ReportError(unsigned errorNumber)
+RegExpParser<CharT>::ReportError(unsigned errorNumber, const char* param /* = nullptr */)
 {
     gc::AutoSuppressGC suppressGC(ts.context());
-    ts.reportError(errorNumber);
+    ts.reportError(errorNumber, param);
     return nullptr;
 }
 
@@ -350,7 +350,7 @@ RegExpParser<CharT>::ParseBracedHexEscape(widechar* value)
         }
         code = (code << 4) | d;
         if (code > unicode::NonBMPMax) {
-            ReportError(JSMSG_UNICODE_OVERFLOW);
+            ReportError(JSMSG_UNICODE_OVERFLOW, "regular expression");
             return false;
         }
         Advance();

js/src/irregexp/RegExpParser.h

@@ -211,7 +211,7 @@ class RegExpParser
     bool ParseBackReferenceIndex(int* index_out);
 
     bool ParseClassAtom(char16_t* char_class, widechar *value);
-    RegExpTree* ReportError(unsigned errorNumber);
+    RegExpTree* ReportError(unsigned errorNumber, const char* param = nullptr);
     void Advance();
     void Advance(int dist) {
         next_pos_ += dist - 1;

js/src/js.msg

@@ -503,7 +503,7 @@ MSG_DEF(JSMSG_RANGE_WITH_CLASS_ESCAPE, 0, JSEXN_SYNTAXERR, "character class esca
 MSG_DEF(JSMSG_RAW_BRACE_IN_REGEP,      0, JSEXN_SYNTAXERR, "raw brace is not allowed in regular expression with unicode flag")
 MSG_DEF(JSMSG_RAW_BRACKET_IN_REGEP,    0, JSEXN_SYNTAXERR, "raw bracket is not allowed in regular expression with unicode flag")
 MSG_DEF(JSMSG_TOO_MANY_PARENS,         0, JSEXN_INTERNALERR, "too many parentheses in regular expression")
-MSG_DEF(JSMSG_UNICODE_OVERFLOW,        0, JSEXN_SYNTAXERR, "unicode codepoint should not be greater than 0x10FFFF in regular expression")
+MSG_DEF(JSMSG_UNICODE_OVERFLOW,        1, JSEXN_SYNTAXERR, "Unicode codepoint must not be greater than 0x10FFFF in {0}")
 MSG_DEF(JSMSG_UNMATCHED_RIGHT_PAREN,   0, JSEXN_SYNTAXERR, "unmatched ) in regular expression")
 MSG_DEF(JSMSG_UNTERM_CLASS,            0, JSEXN_SYNTAXERR, "unterminated character class")