static bool
Quote(StringBuffer& sb, JSLinearString* str)
{
size_t len = str->length();
/* Step 1. */
if (!sb.append('"'))
return false;
/* Step 2. */
JS::AutoCheckCannotGC nogc;
const RangedPtr<const CharT> buf(str->chars<CharT>(nogc), len);
for (size_t i = 0; i < len; ++i) {
/* Batch-append maximal character sequences containing no escapes. */
size_t mark = i;
do {
if (IsQuoteSpecialCharacter(buf[i]))
break;
} while (++i < len);
if (i > mark) {
if (!sb.appendSubstring(str, mark, i - mark))
return false;
if (i == len)
break;
}
char16_t c = buf[i];
if (c == '"' || c == '\\') {
if (!sb.append('\\') || !sb.append(c))
return false;
} else if (c == '\b' || c == '\f' || c == '\n' || c == '\r' || c == '\t') {
char16_t abbrev = (c == '\b')
? 'b'
: (c == '\f')
? 'f'
: (c == '\n')
? 'n'
: (c == '\r')
? 'r'
: 't';
if (!sb.append('\\') || !sb.append(abbrev))
return false;
} else {
MOZ_ASSERT(c < ' ');
if (!sb.append("\\u00"))
return false;
MOZ_ASSERT((c >> 4) < 10);
uint8_t x = c >> 4, y = c % 16;
if (!sb.append(Latin1Char('0' + x)) ||
!sb.append(Latin1Char(y < 10 ? '0' + y : 'a' + (y - 10))))
{
return false;
}
}
}
/* Steps 3-4. */
return sb.append('"');
}
static bool
AppendUseStrictSource(JSContext *cx, HandleFunction fun, Handle<JSFlatString*> src, StringBuffer &out)
{
// We need to add "use strict" in the body right after the opening
// brace.
size_t bodyStart = 0, bodyEnd;
// No need to test for functions created with the Function ctor as
// these don't implicitly inherit the "use strict" context. Strict mode is
// enabled for functions created with the Function ctor only if they begin with
// the "use strict" directive, but these functions won't validate as asm.js
// modules.
if (!FindBody(cx, fun, src, &bodyStart, &bodyEnd))
return false;
return out.appendSubstring(src, 0, bodyStart) &&
out.append("\n\"use strict\";\n") &&
out.appendSubstring(src, bodyStart, src->length() - bodyStart);
}