#include "test/jemalloc_test.h"

TEST_BEGIN(test_same_size)
{
	void *p;
	size_t sz, tsz;

	p = mallocx(42, 0);
	assert_ptr_not_null(p, "Unexpected mallocx() error");
	sz = sallocx(p, 0);

	tsz = xallocx(p, sz, 0, 0);
	assert_zu_eq(tsz, sz, "Unexpected size change: %zu --> %zu", sz, tsz);

	dallocx(p, 0);
}
TEST_END

TEST_BEGIN(test_extra_no_move)
{
	void *p;
	size_t sz, tsz;

	p = mallocx(42, 0);
	assert_ptr_not_null(p, "Unexpected mallocx() error");
	sz = sallocx(p, 0);

	tsz = xallocx(p, sz, sz-42, 0);
	assert_zu_eq(tsz, sz, "Unexpected size change: %zu --> %zu", sz, tsz);

	dallocx(p, 0);
}
TEST_END

TEST_BEGIN(test_no_move_fail)
{
	void *p;
	size_t sz, tsz;

	p = mallocx(42, 0);
	assert_ptr_not_null(p, "Unexpected mallocx() error");
	sz = sallocx(p, 0);

	tsz = xallocx(p, sz + 5, 0, 0);
	assert_zu_eq(tsz, sz, "Unexpected size change: %zu --> %zu", sz, tsz);

	dallocx(p, 0);
}
TEST_END

static unsigned
get_nsizes_impl(const char *cmd)
{
	unsigned ret;
	size_t z;

	z = sizeof(unsigned);
	assert_d_eq(mallctl(cmd, &ret, &z, NULL, 0), 0,
	    "Unexpected mallctl(\"%s\", ...) failure", cmd);

	return (ret);
}

static unsigned
get_nsmall(void)
{

	return (get_nsizes_impl("arenas.nbins"));
}

static unsigned
get_nlarge(void)
{

	return (get_nsizes_impl("arenas.nlruns"));
}

static unsigned
get_nhuge(void)
{

	return (get_nsizes_impl("arenas.nhchunks"));
}

static size_t
get_size_impl(const char *cmd, size_t ind)
{
	size_t ret;
	size_t z;
	size_t mib[4];
	size_t miblen = 4;

	z = sizeof(size_t);
	assert_d_eq(mallctlnametomib(cmd, mib, &miblen),
	    0, "Unexpected mallctlnametomib(\"%s\", ...) failure", cmd);
	mib[2] = ind;
	z = sizeof(size_t);
	assert_d_eq(mallctlbymib(mib, miblen, &ret, &z, NULL, 0),
	    0, "Unexpected mallctlbymib([\"%s\", %zu], ...) failure", cmd, ind);

	return (ret);
}

static size_t
get_small_size(size_t ind)
{

	return (get_size_impl("arenas.bin.0.size", ind));
}

static size_t
get_large_size(size_t ind)
{

	return (get_size_impl("arenas.lrun.0.size", ind));
}

static size_t
get_huge_size(size_t ind)
{

	return (get_size_impl("arenas.hchunk.0.size", ind));
}

TEST_BEGIN(test_extra_small)
{
	size_t small0, small1, hugemax;
	void *p;

	/* Get size classes. */
	small0 = get_small_size(0);
	small1 = get_small_size(1);
	hugemax = get_huge_size(get_nhuge()-1);

	p = mallocx(small0, 0);
	assert_ptr_not_null(p, "Unexpected mallocx() error");

	assert_zu_eq(xallocx(p, small1, 0, 0), small0,
	    "Unexpected xallocx() behavior");

	assert_zu_eq(xallocx(p, small1, 0, 0), small0,
	    "Unexpected xallocx() behavior");

	assert_zu_eq(xallocx(p, small0, small1 - small0, 0), small0,
	    "Unexpected xallocx() behavior");

	/* Test size+extra overflow. */
	assert_zu_eq(xallocx(p, small0, hugemax - small0 + 1, 0), small0,
	    "Unexpected xallocx() behavior");
	assert_zu_eq(xallocx(p, small0, SIZE_T_MAX - small0, 0), small0,
	    "Unexpected xallocx() behavior");

	dallocx(p, 0);
}
TEST_END

TEST_BEGIN(test_extra_large)
{
	size_t smallmax, large0, large1, large2, huge0, hugemax;
	void *p;

	/* Get size classes. */
	smallmax = get_small_size(get_nsmall()-1);
	large0 = get_large_size(0);
	large1 = get_large_size(1);
	large2 = get_large_size(2);
	huge0 = get_huge_size(0);
	hugemax = get_huge_size(get_nhuge()-1);

	p = mallocx(large2, 0);
	assert_ptr_not_null(p, "Unexpected mallocx() error");

	assert_zu_eq(xallocx(p, large2, 0, 0), large2,
	    "Unexpected xallocx() behavior");
	/* Test size decrease with zero extra. */
	assert_zu_eq(xallocx(p, large0, 0, 0), large0,
	    "Unexpected xallocx() behavior");
	assert_zu_eq(xallocx(p, smallmax, 0, 0), large0,
	    "Unexpected xallocx() behavior");

	assert_zu_eq(xallocx(p, large2, 0, 0), large2,
	    "Unexpected xallocx() behavior");
	/* Test size decrease with non-zero extra. */
	assert_zu_eq(xallocx(p, large0, large2 - large0, 0), large2,
	    "Unexpected xallocx() behavior");
	assert_zu_eq(xallocx(p, large1, large2 - large1, 0), large2,
	    "Unexpected xallocx() behavior");
	assert_zu_eq(xallocx(p, large0, large1 - large0, 0), large1,
	    "Unexpected xallocx() behavior");
	assert_zu_eq(xallocx(p, smallmax, large0 - smallmax, 0), large0,
	    "Unexpected xallocx() behavior");

	assert_zu_eq(xallocx(p, large0, 0, 0), large0,
	    "Unexpected xallocx() behavior");
	/* Test size increase with zero extra. */
	assert_zu_eq(xallocx(p, large2, 0, 0), large2,
	    "Unexpected xallocx() behavior");
	assert_zu_eq(xallocx(p, huge0, 0, 0), large2,
	    "Unexpected xallocx() behavior");

	assert_zu_eq(xallocx(p, large0, 0, 0), large0,
	    "Unexpected xallocx() behavior");
	/* Test size increase with non-zero extra. */
	assert_zu_lt(xallocx(p, large0, huge0 - large0, 0), huge0,
	    "Unexpected xallocx() behavior");

	assert_zu_eq(xallocx(p, large0, 0, 0), large0,
	    "Unexpected xallocx() behavior");
	/* Test size increase with non-zero extra. */
	assert_zu_eq(xallocx(p, large0, large2 - large0, 0), large2,
	    "Unexpected xallocx() behavior");

	assert_zu_eq(xallocx(p, large2, 0, 0), large2,
	    "Unexpected xallocx() behavior");
	/* Test size+extra overflow. */
	assert_zu_lt(xallocx(p, large2, hugemax - large2 + 1, 0), huge0,
	    "Unexpected xallocx() behavior");

	dallocx(p, 0);
}
TEST_END

TEST_BEGIN(test_extra_huge)
{
	size_t largemax, huge0, huge1, huge2, hugemax;
	void *p;

	/* Get size classes. */
	largemax = get_large_size(get_nlarge()-1);
	huge0 = get_huge_size(0);
	huge1 = get_huge_size(1);
	huge2 = get_huge_size(2);
	hugemax = get_huge_size(get_nhuge()-1);

	p = mallocx(huge2, 0);
	assert_ptr_not_null(p, "Unexpected mallocx() error");

	assert_zu_eq(xallocx(p, huge2, 0, 0), huge2,
	    "Unexpected xallocx() behavior");
	/* Test size decrease with zero extra. */
	assert_zu_eq(xallocx(p, huge0, 0, 0), huge0,
	    "Unexpected xallocx() behavior");
	assert_zu_eq(xallocx(p, largemax, 0, 0), huge0,
	    "Unexpected xallocx() behavior");

	assert_zu_eq(xallocx(p, huge2, 0, 0), huge2,
	    "Unexpected xallocx() behavior");
	/* Test size decrease with non-zero extra. */
	assert_zu_eq(xallocx(p, huge0, huge2 - huge0, 0), huge2,
	    "Unexpected xallocx() behavior");
	assert_zu_eq(xallocx(p, huge1, huge2 - huge1, 0), huge2,
	    "Unexpected xallocx() behavior");
	assert_zu_eq(xallocx(p, huge0, huge1 - huge0, 0), huge1,
	    "Unexpected xallocx() behavior");
	assert_zu_eq(xallocx(p, largemax, huge0 - largemax, 0), huge0,
	    "Unexpected xallocx() behavior");

	assert_zu_eq(xallocx(p, huge0, 0, 0), huge0,
	    "Unexpected xallocx() behavior");
	/* Test size increase with zero extra. */
	assert_zu_eq(xallocx(p, huge2, 0, 0), huge2,
	    "Unexpected xallocx() behavior");
	assert_zu_eq(xallocx(p, hugemax+1, 0, 0), huge2,
	    "Unexpected xallocx() behavior");

	assert_zu_eq(xallocx(p, huge0, 0, 0), huge0,
	    "Unexpected xallocx() behavior");
	/* Test size increase with non-zero extra. */
	assert_zu_le(xallocx(p, huge0, SIZE_T_MAX - huge0, 0), hugemax,
	    "Unexpected xallocx() behavior");

	assert_zu_eq(xallocx(p, huge0, 0, 0), huge0,
	    "Unexpected xallocx() behavior");
	/* Test size increase with non-zero extra. */
	assert_zu_eq(xallocx(p, huge0, huge2 - huge0, 0), huge2,
	    "Unexpected xallocx() behavior");

	assert_zu_eq(xallocx(p, huge2, 0, 0), huge2,
	    "Unexpected xallocx() behavior");
	/* Test size+extra overflow. */
	assert_zu_le(xallocx(p, huge2, hugemax - huge2 + 1, 0), hugemax,
	    "Unexpected xallocx() behavior");

	dallocx(p, 0);
}
TEST_END

int
main(void)
{

	return (test(
	    test_same_size,
	    test_extra_no_move,
	    test_no_move_fail,
	    test_extra_small,
	    test_extra_large,
	    test_extra_huge));
}