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Bug 648526 - Constant folding in array and object literals. r=bhackett

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This commit is contained in:
Tom Schuster 2012-05-02 16:12:07 +02:00
parent 949d0ed298
commit 6446af5eb2
2 changed files with 37 additions and 2 deletions
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11
js/src/frontend/Parser.cpp
View File

@ -6759,8 +6759,12 @@ Parser::primaryExpr(TokenKind tt, bool afterDoubleDot)
pn->pn_xflags |= PNX_HOLEY | PNX_NONCONST;
} else {
pn2 = assignExpr();
if (pn2 && !pn2->isConstant())
pn->pn_xflags |= PNX_NONCONST;
if (pn2) {
if (foldConstants && !FoldConstants(context, pn2, tc))
return NULL;
if (!pn2->isConstant())
pn->pn_xflags |= PNX_NONCONST;
}
}
if (!pn2)
return NULL;
@ -6975,6 +6979,9 @@ Parser::primaryExpr(TokenKind tt, bool afterDoubleDot)
if (!pnval)
return NULL;
if (foldConstants && !FoldConstants(context, pnval, tc))
return NULL;
/*
* Treat initializers which mutate __proto__ as non-constant,
* so that we can later assume singleton objects delegate to

28
js/src/jit-test/tests/basic/testInitSingletons.js
View File

@ -29,3 +29,31 @@ assertEq(q[4294967295], 2);
try {
[1,2,3,{a:0,b:1}].foo.bar;
} catch (e) { assertEq(e.message, "[1, 2, 3, {a:0, b:1}].foo is undefined"); }
var a = [1 + 1, 3 * 2, 6 - 5, 14 % 6, 15 / 5, 1 << 3,
8 >> 2, 5 | 2, 5 ^ 3, ~3, -3,"a" + "b", !true, !false];
assertEq(String(a), "2,6,1,2,3,8,2,7,6,-4,-3,ab,false,true");
assertEq(a.length, 14);
var b = {
a: 1 + 1,
b: 3 * 2,
c: 6 - 5,
d: 14 % 6,
e: 15 / 5,
f: 1 << 3,
g: 8 >> 2,
h: 5 | 2,
i: 5 ^ 3,
j: ~3,
k: -3,
l: "a" + "b",
m: !true,
n: !false,
}
var char = "a".charCodeAt(0);
for (var i = 0; i < a.length; i++) {
assertEq(b[String.fromCharCode(char)], a[i]);
char++;
}