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enable interpose separate from zones on macOS

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daan 2020-02-08 20:08:52 -08:00
parent e676062103
commit 9062f39764
3 changed files with 28 additions and 10 deletions
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20
src/alloc-override-osx.c
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@ -14,7 +14,6 @@ terms of the MIT license. A copy of the license can be found in the file
#error "this file should only be included on macOS"
#endif
#warning "malloc zones do not seem to work for now; use MI_INTERPOSE instead"
/* ------------------------------------------------------
Override system malloc on macOS
This is done through the malloc zone interface.
@ -182,8 +181,10 @@ static malloc_zone_t* mi_get_default_zone()
}
}
#if 0
// directly overwrite the default zone as per:
// <https://lists.apple.com/archives/darwin-dev/2005/Apr/msg00050.html>
#include <mach/mach.h>
static void __attribute__((constructor)) _mi_macos_override_malloc_direct()
{
@ -199,13 +200,18 @@ static void __attribute__((constructor)) _mi_macos_override_malloc_direct()
intro.force_unlock = &intro_force_unlock;
static malloc_zone_t oldzone;
static malloc_zone_t* zone = malloc_default_zone(); // get the `malloc` backing default zone
static malloc_zone_t* zone;
zone = mi_get_default_zone(); // get the `malloc` backing default zone
if (zone == NULL) return;
// save the default zone in oldzone
memset(&oldzone, 0, sizeof(oldzone));
if (zone->version >= 9) memcpy(&oldzone, zone, sizeof(oldzone));
if (zone->version >= 8) {
vm_protect(mach_task_self(), (uintptr_t)zone, sizeof(*zone), 0,
VM_PROT_READ|VM_PROT_WRITE);
}
// overwrite default zone functions in-place
zone->zone_name = "mimalloc";
zone->size = &zone_size;
@ -237,6 +243,11 @@ static void __attribute__((constructor)) _mi_macos_override_malloc_direct()
}
*/
#endif
if (zone->version >= 8) {
vm_protect(mach_task_self(), (uintptr_t)zone, sizeof(*zone), 0,
VM_PROT_READ);
}
/*
// Unregister, and re-register the purgeable_zone to avoid bugs if it occurs
// earlier than the default zone.
@ -247,7 +258,8 @@ static void __attribute__((constructor)) _mi_macos_override_malloc_direct()
*/
}
/*
#else
static void __attribute__((constructor)) _mi_macos_override_malloc()
{
static malloc_introspection_t intro;
@ -314,6 +326,6 @@ static void __attribute__((constructor)) _mi_macos_override_malloc()
}
}
*/
#endif
#endif // MI_MALLOC_OVERRIDE