#include "test/jemalloc_test.h"
#include "jemalloc/jemalloc_macros.h"

#define STR_HELPER(x) #x
#define STR(x) STR_HELPER(x)

#ifndef JEMALLOC_VERSION_GID_IDENT
 #error "JEMALLOC_VERSION_GID_IDENT not defined"
#endif

#define JOIN(x, y) x ## y
#define JOIN2(x, y) JOIN(x, y)
#define smallocx JOIN2(smallocx_, JEMALLOC_VERSION_GID_IDENT)

typedef struct {
       void *ptr;
       size_t size;
} smallocx_return_t;

extern smallocx_return_t
smallocx(size_t size, int flags);

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

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

       return ret;
}

static unsigned
get_nlarge(void) {
       return get_nsizes_impl("arenas.nlextents");
}

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

       return ret;
}

static size_t
get_large_size(size_t ind) {
       return get_size_impl("arenas.lextent.0.size", ind);
}

/*
* On systems which can't merge extents, tests that call this function generate
* a lot of dirty memory very quickly.  Purging between cycles mitigates
* potential OOM on e.g. 32-bit Windows.
*/
static void
purge(void) {
       expect_d_eq(mallctl("arena.0.purge", NULL, NULL, NULL, 0), 0,
           "Unexpected mallctl error");
}

/*
* GCC "-Walloc-size-larger-than" warning detects when one of the memory
* allocation functions is called with a size larger than the maximum size that
* they support. Here we want to explicitly test that the allocation functions
* do indeed fail properly when this is the case, which triggers the warning.
* Therefore we disable the warning for these tests.
*/
JEMALLOC_DIAGNOSTIC_PUSH
JEMALLOC_DIAGNOSTIC_IGNORE_ALLOC_SIZE_LARGER_THAN

TEST_BEGIN(test_overflow) {
       size_t largemax;

       largemax = get_large_size(get_nlarge()-1);

       expect_ptr_null(smallocx(largemax+1, 0).ptr,
           "Expected OOM for smallocx(size=%#zx, 0)", largemax+1);

       expect_ptr_null(smallocx(ZU(PTRDIFF_MAX)+1, 0).ptr,
           "Expected OOM for smallocx(size=%#zx, 0)", ZU(PTRDIFF_MAX)+1);

       expect_ptr_null(smallocx(SIZE_T_MAX, 0).ptr,
           "Expected OOM for smallocx(size=%#zx, 0)", SIZE_T_MAX);

       expect_ptr_null(smallocx(1, MALLOCX_ALIGN(ZU(PTRDIFF_MAX)+1)).ptr,
           "Expected OOM for smallocx(size=1, MALLOCX_ALIGN(%#zx))",
           ZU(PTRDIFF_MAX)+1);
}
TEST_END

static void *
remote_alloc(void *arg) {
       unsigned arena;
       size_t sz = sizeof(unsigned);
       expect_d_eq(mallctl("arenas.create", (void *)&arena, &sz, NULL, 0), 0,
           "Unexpected mallctl() failure");
       size_t large_sz;
       sz = sizeof(size_t);
       expect_d_eq(mallctl("arenas.lextent.0.size", (void *)&large_sz, &sz,
           NULL, 0), 0, "Unexpected mallctl failure");

       smallocx_return_t r
           = smallocx(large_sz, MALLOCX_ARENA(arena) | MALLOCX_TCACHE_NONE);
       void *ptr = r.ptr;
       expect_zu_eq(r.size,
           nallocx(large_sz, MALLOCX_ARENA(arena) | MALLOCX_TCACHE_NONE),
           "Expected smalloc(size,flags).size == nallocx(size,flags)");
       void **ret = (void **)arg;
       *ret = ptr;

       return NULL;
}

TEST_BEGIN(test_remote_free) {
       thd_t thd;
       void *ret;
       thd_create(&thd, remote_alloc, (void *)&ret);
       thd_join(thd, NULL);
       expect_ptr_not_null(ret, "Unexpected smallocx failure");

       /* Avoid TCACHE_NONE to explicitly test tcache_flush(). */
       dallocx(ret, 0);
       mallctl("thread.tcache.flush", NULL, NULL, NULL, 0);
}
TEST_END

TEST_BEGIN(test_oom) {
       size_t largemax;
       bool oom;
       void *ptrs[3];
       unsigned i;

       /*
        * It should be impossible to allocate three objects that each consume
        * nearly half the virtual address space.
        */
       largemax = get_large_size(get_nlarge()-1);
       oom = false;
       for (i = 0; i < sizeof(ptrs) / sizeof(void *); i++) {
               ptrs[i] = smallocx(largemax, 0).ptr;
               if (ptrs[i] == NULL) {
                       oom = true;
               }
       }
       expect_true(oom,
           "Expected OOM during series of calls to smallocx(size=%zu, 0)",
           largemax);
       for (i = 0; i < sizeof(ptrs) / sizeof(void *); i++) {
               if (ptrs[i] != NULL) {
                       dallocx(ptrs[i], 0);
               }
       }
       purge();

#if LG_SIZEOF_PTR == 3
       expect_ptr_null(smallocx(0x8000000000000000ULL,
           MALLOCX_ALIGN(0x8000000000000000ULL)).ptr,
           "Expected OOM for smallocx()");
       expect_ptr_null(smallocx(0x8000000000000000ULL,
           MALLOCX_ALIGN(0x80000000)).ptr,
           "Expected OOM for smallocx()");
#else
       expect_ptr_null(smallocx(0x80000000UL, MALLOCX_ALIGN(0x80000000UL)).ptr,
           "Expected OOM for smallocx()");
#endif
}
TEST_END

/* Re-enable the "-Walloc-size-larger-than=" warning */
JEMALLOC_DIAGNOSTIC_POP

TEST_BEGIN(test_basic) {
#define MAXSZ (((size_t)1) << 23)
       size_t sz;

       for (sz = 1; sz < MAXSZ; sz = nallocx(sz, 0) + 1) {
               smallocx_return_t ret;
               size_t nsz, rsz, smz;
               void *p;
               nsz = nallocx(sz, 0);
               expect_zu_ne(nsz, 0, "Unexpected nallocx() error");
               ret = smallocx(sz, 0);
               p = ret.ptr;
               smz = ret.size;
               expect_ptr_not_null(p,
                   "Unexpected smallocx(size=%zx, flags=0) error", sz);
               rsz = sallocx(p, 0);
               expect_zu_ge(rsz, sz, "Real size smaller than expected");
               expect_zu_eq(nsz, rsz, "nallocx()/sallocx() size mismatch");
               expect_zu_eq(nsz, smz, "nallocx()/smallocx() size mismatch");
               dallocx(p, 0);

               ret = smallocx(sz, 0);
               p = ret.ptr;
               smz = ret.size;
               expect_ptr_not_null(p,
                   "Unexpected smallocx(size=%zx, flags=0) error", sz);
               dallocx(p, 0);

               nsz = nallocx(sz, MALLOCX_ZERO);
               expect_zu_ne(nsz, 0, "Unexpected nallocx() error");
               expect_zu_ne(smz, 0, "Unexpected smallocx() error");
               ret = smallocx(sz, MALLOCX_ZERO);
               p = ret.ptr;
               expect_ptr_not_null(p,
                   "Unexpected smallocx(size=%zx, flags=MALLOCX_ZERO) error",
                   nsz);
               rsz = sallocx(p, 0);
               expect_zu_eq(nsz, rsz, "nallocx()/sallocx() rsize mismatch");
               expect_zu_eq(nsz, smz, "nallocx()/smallocx() size mismatch");
               dallocx(p, 0);
               purge();
       }
#undef MAXSZ
}
TEST_END

TEST_BEGIN(test_alignment_and_size) {
       const char *percpu_arena;
       size_t sz = sizeof(percpu_arena);

       if(mallctl("opt.percpu_arena", (void *)&percpu_arena, &sz, NULL, 0) ||
           strcmp(percpu_arena, "disabled") != 0) {
               test_skip("test_alignment_and_size skipped: "
                   "not working with percpu arena.");
       };
#define MAXALIGN (((size_t)1) << 23)
#define NITER 4
       size_t nsz, rsz, smz, alignment, total;
       unsigned i;
       void *ps[NITER];

       for (i = 0; i < NITER; i++) {
               ps[i] = NULL;
       }

       for (alignment = 8;
           alignment <= MAXALIGN;
           alignment <<= 1) {
               total = 0;
               for (sz = 1;
                   sz < 3 * alignment && sz < (1U << 31);
                   sz += (alignment >> (LG_SIZEOF_PTR-1)) - 1) {
                       for (i = 0; i < NITER; i++) {
                               nsz = nallocx(sz, MALLOCX_ALIGN(alignment) |
                                   MALLOCX_ZERO);
                               expect_zu_ne(nsz, 0,
                                   "nallocx() error for alignment=%zu, "
                                   "size=%zu (%#zx)", alignment, sz, sz);
                               smallocx_return_t ret
                                   = smallocx(sz, MALLOCX_ALIGN(alignment) | MALLOCX_ZERO);
                               ps[i] = ret.ptr;
                               expect_ptr_not_null(ps[i],
                                   "smallocx() error for alignment=%zu, "
                                   "size=%zu (%#zx)", alignment, sz, sz);
                               rsz = sallocx(ps[i], 0);
                               smz = ret.size;
                               expect_zu_ge(rsz, sz,
                                   "Real size smaller than expected for "
                                   "alignment=%zu, size=%zu", alignment, sz);
                               expect_zu_eq(nsz, rsz,
                                   "nallocx()/sallocx() size mismatch for "
                                   "alignment=%zu, size=%zu", alignment, sz);
                               expect_zu_eq(nsz, smz,
                                   "nallocx()/smallocx() size mismatch for "
                                   "alignment=%zu, size=%zu", alignment, sz);
                               expect_ptr_null(
                                   (void *)((uintptr_t)ps[i] & (alignment-1)),
                                   "%p inadequately aligned for"
                                   " alignment=%zu, size=%zu", ps[i],
                                   alignment, sz);
                               total += rsz;
                               if (total >= (MAXALIGN << 1)) {
                                       break;
                               }
                       }
                       for (i = 0; i < NITER; i++) {
                               if (ps[i] != NULL) {
                                       dallocx(ps[i], 0);
                                       ps[i] = NULL;
                               }
                       }
               }
               purge();
       }
#undef MAXALIGN
#undef NITER
}
TEST_END

int
main(void) {
       return test(
           test_overflow,
           test_oom,
           test_remote_free,
           test_basic,
           test_alignment_and_size);
}

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