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// |jit-test| skip-if: !('stringRepresentation' in this)
// This is to test the correctness of the string deduplication algorithm during
// the tenuring phase. Same strings below refer to the same character encoding
// (either latin1 or twobyte) and the same characters.
// Tests:
// 1. Same strings with same flags and zones should be deduplicated for
// all linear strings except atoms and external strings.
// 2. Same strings, but from different zones should not be deduplicated.
// 3. Same strings, but with different flags should not be deduplicated.
// We require predictable GC timing to make sure the correct
// strings are tenured together.
gczeal(0);
gcparam('semispaceNurseryEnabled', 0);
var helperCode = `
function makeInlineStr(isLatin1) {
var s = isLatin1 ? "123456789*1" : "一二三";
return s + s;
}
// Generic linear strings are non-atom, non-extensible, non-inline
// linear strings.
// Generic linear strings can only have latin1 characters.
function makeGenericLinearStr() {
return notes(() => 1);
}
function makeRopeStr(isLatin1) {
var left = isLatin1 ? "1" : "一";
var right = isLatin1 ? "123456789*123456789*123456" :
"一二三四五六七八九*一二三四五六七八";
return left + right;
}
function makeExtensibleStr(isLatin1) {
var r = makeRopeStr(isLatin1);
ensureLinearString(r);
return r;
}
function makeExtensibleStrFrom(str) {
var left = str.substr(0, str.length/2);
var right = str.substr(str.length/2, str.length);
var ropeStr = left + right;
return ensureLinearString(ropeStr);
}
function makeDependentStr(isLatin1) {
var e = makeExtensibleStr(isLatin1);
var r1 = e + "!";
var r2 = e + r1;
ensureLinearString(r2);
return r1;
}
function makeDependentStrFrom(str) {
var e = makeExtensibleStrFrom(str);
var r1 = e.substr(0, e.length/2) + e.substr(e.length/2, e.length);
var r2 = e + r1;
ensureLinearString(r2);
return r1;
}
function makeExternalStr(isLatin1) {
return isLatin1 ? newString("12345678", {external: true}) :
newString("一二三", {external: true});
}
function tenureStringsWithSameChars(str1, str2, isDeduplicatable) {
minorgc();
assertEq(stringRepresentation(str1) == stringRepresentation(str2),
isDeduplicatable);
}
function assertDiffStrRepAfterMinorGC(g1, g2) {
minorgc();
g1.eval(\`strRep = stringRepresentation(str);\`);
g2.eval(\`strRep = stringRepresentation(str);\`);
assertEq(g1.strRep == g2.strRep, false);
}
`;
eval(helperCode);
// test1:
// Same strings with same flags and zones should be deduplicated for all linear
// strings except atoms, external strings.
function test1(isLatin1) {
const isDeduplicatable = true;
// Deduplicatable:
// --> Inline Strings
var str1 = makeInlineStr(isLatin1);
var str2 = makeInlineStr(isLatin1);
tenureStringsWithSameChars(str1, str2, isDeduplicatable);
// --> Extensible Strings
str1 = makeExtensibleStr(isLatin1);
str2 = makeExtensibleStr(isLatin1);
tenureStringsWithSameChars(str1, str2, isDeduplicatable);
// --> Dependent Strings
str1 = makeDependentStr(isLatin1);
str2 = makeDependentStr(isLatin1);
tenureStringsWithSameChars(str1, str2, isDeduplicatable);
// --> Generic Linear Strings
if (isLatin1) {
var str1 = makeGenericLinearStr();
var str2 = makeGenericLinearStr();
tenureStringsWithSameChars(str1, str2, isDeduplicatable);
}
// Non-Deduplicatable:
// --> Rope Strings
str1 = makeRopeStr(isLatin1);
str2 = makeRopeStr(isLatin1);
tenureStringsWithSameChars(str1, str2, !isDeduplicatable);
// --> Atom strings are deduplicated already but not through string
// deduplication during tenuring.
// --> External strings are not nursery allocated.
}
// test2:
// Same strings, but from different zones should not be deduplicated.
function test2(isLatin1) {
var g1 = newGlobal({ newCompartment: true });
var g2 = newGlobal({ newCompartment: true });
g1.eval(helperCode);
g2.eval(helperCode);
// --> Inline Strings
g1.eval(`var str = makeInlineStr(${isLatin1}); `);
g2.eval(`var str = makeInlineStr(${isLatin1}); `);
assertDiffStrRepAfterMinorGC(g1, g2);
// --> Extensible Strings
g1.eval(`str = makeExtensibleStr(${isLatin1}); `);
g2.eval(`str = makeExtensibleStr(${isLatin1}); `);
assertDiffStrRepAfterMinorGC(g1, g2);
// --> Dependent Strings
g1.eval(`str = makeDependentStr(${isLatin1}); `);
g2.eval(`str = makeDependentStr(${isLatin1}); `);
assertDiffStrRepAfterMinorGC(g1, g2);
// --> Generic Linear Strings
if (isLatin1) {
g1.eval(`str = makeGenericLinearStr();`);
g2.eval(`str = makeGenericLinearStr();`);
assertDiffStrRepAfterMinorGC(g1, g2);
}
}
// test3:
// Same strings, but with different flags should not be deduplicated.
function test3(isLatin1) {
const isDeduplicatable = true;
// --> Dependent String and Extensible String
var dependentStr = makeDependentStr(isLatin1);
var extensibleStr = makeExtensibleStrFrom(dependentStr);
tenureStringsWithSameChars(dependentStr, extensibleStr, !isDeduplicatable);
if (isLatin1) {
// --> Generic Linear String and Extensible String
var genericLinearStr = makeGenericLinearStr();
var extensibleStr = makeExtensibleStrFrom(genericLinearStr);
tenureStringsWithSameChars(
genericLinearStr,
extensibleStr,
!isDeduplicatable
);
// --> Generic Linear String and Dependent String
var dependentStr = makeDependentStrFrom(genericLinearStr);
tenureStringsWithSameChars(
dependentStr,
genericLinearStr,
!isDeduplicatable
);
}
// --> Inline strings are too short to have the same chars as the extensible
// strings, generic linear strings and dependent strings
}
function runTests() {
var charEncoding = { TWOBYTE: 0, LATIN1: 1 };
test1(charEncoding.TWOBYTE);
test2(charEncoding.TWOBYTE);
test3(charEncoding.TWOBYTE);
test1(charEncoding.LATIN1);
test2(charEncoding.LATIN1);
test3(charEncoding.LATIN1);
}
runTests();
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