src/v8/test/mjsunit/regress/splice-missing-wb.js

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// Flags: --expose-gc

// Create array large enough to span several page regions.
var a = new Array(500);

// Fill it with values.
for (var i = 0; i < a.length; i++) a[i] = {idx:i};

// Force it into oldspace.
gc();
gc();

// Array should be in old space now. Store young object into array.
// Region will be marked.
a[0] = {idx:0};

// Delete elements a[2] .. a[201]. Internally we will use
// trimming of backing store. a[0] a[1] will be moved to
// memory location previously occupied by a[200] a[201].
a.splice(2, 200);

// Force gc and heap verification.
gc();

// Try accessing a[0].idx. It will segfault if write-barrier was accidentally
// omitted.
assertEquals(0, a[0].idx);
assertEquals(1, a[1].idx);
assertEquals(202, a[2].idx);