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56 lines
1.4 KiB
56 lines
1.4 KiB
/*===
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top=0
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rc=1, result=Error: invalid index: 536870912
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top=0
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rc=1, result=Error: invalid index: 357913942
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===*/
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int test_1(duk_context *ctx) {
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printf("top=%d\n", duk_get_top(ctx));
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/* duk_set_top() uses pointer arithmetic internally, and because
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* duk_tval is a multibyte structure, it's possible to wrap the
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* pointers and allow incorrect duk_set_top() calls to work.
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*
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* For instance, on a 32-bit platform and 8-byte duk_tval values,
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* the top value (2**32 / 8) = 0x20000000 is equivalent to using
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* the top value 0. This should not be the case.
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*
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* This test case will NOT fail on a 64-bit platform.
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*/
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duk_push_string(ctx, "foo");
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duk_set_top(ctx, 0x20000000);
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printf("top=%d\n", duk_get_top(ctx));
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return 0;
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}
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int test_2(duk_context *ctx) {
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printf("top=%d\n", duk_get_top(ctx));
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/* On a 32-bit platform and 12-byte values there is no zero-
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* equivalent value: (2**32 / 12) = 0x15555555, but 0x1555555 * 12
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* = 0xfffffffc. This is even more harmful than simple wrapping.
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* Test value 0x15555556 = 0x100000008, wraps to 8.
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*/
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duk_push_string(ctx, "foo");
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duk_set_top(ctx, 0x15555556);
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printf("top=%d\n", duk_get_top(ctx));
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return 0;
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}
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void test(duk_context *ctx) {
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int rc;
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rc = duk_safe_call(ctx, test_1, 0, 1);
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printf("rc=%d, result=%s\n", rc, duk_to_string(ctx, -1));
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duk_pop(ctx);
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rc = duk_safe_call(ctx, test_2, 0, 1);
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printf("rc=%d, result=%s\n", rc, duk_to_string(ctx, -1));
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duk_pop(ctx);
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}
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