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Bug 1025875 part 3 - Make CompareStrings and CompareAtoms work with Latin1 strings. r=njn

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This commit is contained in:
Jan de Mooij 2014-06-17 11:28:50 +02:00
parent 01cf5ea3fc
commit 2cbb0e1746
3 changed files with 52 additions and 17 deletions
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20
js/src/jit-test/tests/latin1/compare.js Normal file
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@ -0,0 +1,20 @@
function test() {
var arr = [
toLatin1("abc"),
toLatin1("abcd"),
toLatin1("123\u00ff")
];
for (var i = 0; i < arr.length; i++) {
for (var j = 0; j < arr.length; j++) {
var s1 = arr[i];
var s2 = arr[j];
var s1tb = "\u1200" + s1;
var s2tb = "\u1200" + s2;
assertEq(s1 < s2, s1tb < s2tb);
assertEq(s1 > s2, s1tb > s2tb);
assertEq(s1 <= s2, s1tb <= s2tb);
assertEq(s1 >= s2, s1tb >= s2tb);
}
}
}
test();

42
js/src/jsstr.cpp
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@ -4521,8 +4521,28 @@ js::EqualStrings(JSLinearString *str1, JSLinearString *str2)
return EqualChars(str1, str2);
}
static bool
CompareStringsImpl(JSContext *cx, JSString *str1, JSString *str2, int32_t *result)
static int32_t
CompareStringsImpl(JSLinearString *str1, JSLinearString *str2)
{
size_t len1 = str1->length();
size_t len2 = str2->length();
AutoCheckCannotGC nogc;
if (str1->hasLatin1Chars()) {
const Latin1Char *chars1 = str1->latin1Chars(nogc);
return str2->hasLatin1Chars()
? CompareChars(chars1, len1, str2->latin1Chars(nogc), len2)
: CompareChars(chars1, len1, str2->twoByteChars(nogc), len2);
}
const jschar *chars1 = str1->twoByteChars(nogc);
return str2->hasLatin1Chars()
? CompareChars(chars1, len1, str2->latin1Chars(nogc), len2)
: CompareChars(chars1, len1, str2->twoByteChars(nogc), len2);
}
bool
js::CompareStrings(JSContext *cx, JSString *str1, JSString *str2, int32_t *result)
{
JS_ASSERT(str1);
JS_ASSERT(str2);
@ -4532,28 +4552,22 @@ CompareStringsImpl(JSContext *cx, JSString *str1, JSString *str2, int32_t *resul
return true;
}
const jschar *s1 = str1->getChars(cx);
if (!s1)
JSLinearString *linear1 = str1->ensureLinear(cx);
if (!linear1)
return false;
const jschar *s2 = str2->getChars(cx);
if (!s2)
JSLinearString *linear2 = str2->ensureLinear(cx);
if (!linear2)
return false;
*result = CompareChars(s1, str1->length(), s2, str2->length());
*result = CompareStringsImpl(linear1, linear2);
return true;
}
bool
js::CompareStrings(JSContext *cx, JSString *str1, JSString *str2, int32_t *result)
{
return CompareStringsImpl(cx, str1, str2, result);
}
int32_t
js::CompareAtoms(JSAtom *atom1, JSAtom *atom2)
{
return CompareChars(atom1->chars(), atom1->length(), atom2->chars(), atom2->length());
return CompareStringsImpl(atom1, atom2);
}
bool

7
js/src/jsstr.h
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@ -48,16 +48,17 @@ SkipSpace(const CharT *s, const CharT *end)
// Return less than, equal to, or greater than zero depending on whether
// s1 is less than, equal to, or greater than s2.
template <typename Char1, typename Char2>
inline int32_t
CompareChars(const jschar *s1, size_t l1, const jschar *s2, size_t l2)
CompareChars(const Char1 *s1, size_t len1, const Char2 *s2, size_t len2)
{
size_t n = Min(l1, l2);
size_t n = Min(len1, len2);
for (size_t i = 0; i < n; i++) {
if (int32_t cmp = s1[i] - s2[i])
return cmp;
}
return (int32_t)(l1 - l2);
return int32_t(len1 - len2);
}
} /* namespace js */