diff options
Diffstat (limited to 'ports/unix/gccollect.c')
| -rw-r--r-- | ports/unix/gccollect.c | 137 |
1 files changed, 3 insertions, 134 deletions
diff --git a/ports/unix/gccollect.c b/ports/unix/gccollect.c index 231f016c2..f0441e4ea 100644 --- a/ports/unix/gccollect.c +++ b/ports/unix/gccollect.c @@ -29,146 +29,15 @@ #include "py/mpstate.h" #include "py/gc.h" -#if MICROPY_ENABLE_GC - -// Even if we have specific support for an architecture, it is -// possible to force use of setjmp-based implementation. -#if !MICROPY_GCREGS_SETJMP - -// We capture here callee-save registers, i.e. ones which may contain -// interesting values held there by our callers. It doesn't make sense -// to capture caller-saved registers, because they, well, put on the -// stack already by the caller. -#if defined(__x86_64__) -typedef mp_uint_t regs_t[6]; - -STATIC void gc_helper_get_regs(regs_t arr) { - register long rbx asm ("rbx"); - register long rbp asm ("rbp"); - register long r12 asm ("r12"); - register long r13 asm ("r13"); - register long r14 asm ("r14"); - register long r15 asm ("r15"); - #ifdef __clang__ - // TODO: - // This is dirty workaround for Clang. It tries to get around - // uncompliant (wrt to GCC) behavior of handling register variables. - // Application of this patch here is random, and done only to unbreak - // MacOS build. Better, cross-arch ways to deal with Clang issues should - // be found. - asm ("" : "=r" (rbx)); - asm ("" : "=r" (rbp)); - asm ("" : "=r" (r12)); - asm ("" : "=r" (r13)); - asm ("" : "=r" (r14)); - asm ("" : "=r" (r15)); - #endif - arr[0] = rbx; - arr[1] = rbp; - arr[2] = r12; - arr[3] = r13; - arr[4] = r14; - arr[5] = r15; -} - -#elif defined(__i386__) - -typedef mp_uint_t regs_t[4]; - -STATIC void gc_helper_get_regs(regs_t arr) { - register long ebx asm ("ebx"); - register long esi asm ("esi"); - register long edi asm ("edi"); - register long ebp asm ("ebp"); - #ifdef __clang__ - // TODO: - // This is dirty workaround for Clang. It tries to get around - // uncompliant (wrt to GCC) behavior of handling register variables. - // Application of this patch here is random, and done only to unbreak - // MacOS build. Better, cross-arch ways to deal with Clang issues should - // be found. - asm ("" : "=r" (ebx)); - asm ("" : "=r" (esi)); - asm ("" : "=r" (edi)); - asm ("" : "=r" (ebp)); - #endif - arr[0] = ebx; - arr[1] = esi; - arr[2] = edi; - arr[3] = ebp; -} - -#elif defined(__thumb2__) || defined(__thumb__) || defined(__arm__) - -typedef mp_uint_t regs_t[10]; +#include "lib/utils/gchelper.h" -STATIC void gc_helper_get_regs(regs_t arr) { - register long r4 asm ("r4"); - register long r5 asm ("r5"); - register long r6 asm ("r6"); - register long r7 asm ("r7"); - register long r8 asm ("r8"); - register long r9 asm ("r9"); - register long r10 asm ("r10"); - register long r11 asm ("r11"); - register long r12 asm ("r12"); - register long r13 asm ("r13"); - arr[0] = r4; - arr[1] = r5; - arr[2] = r6; - arr[3] = r7; - arr[4] = r8; - arr[5] = r9; - arr[6] = r10; - arr[7] = r11; - arr[8] = r12; - arr[9] = r13; -} - -#else - -// If we don't have architecture-specific optimized support, -// just fall back to setjmp-based implementation. -#undef MICROPY_GCREGS_SETJMP -#define MICROPY_GCREGS_SETJMP (1) - -#endif // Arch-specific selection -#endif // !MICROPY_GCREGS_SETJMP - -// If MICROPY_GCREGS_SETJMP was requested explicitly, or if -// we enabled it as a fallback above. -#if MICROPY_GCREGS_SETJMP -#include <setjmp.h> - -typedef jmp_buf regs_t; - -STATIC void gc_helper_get_regs(regs_t arr) { - setjmp(arr); -} - -#endif // MICROPY_GCREGS_SETJMP - -// this function is used by mpthreadport.c -MP_NOINLINE void gc_collect_regs_and_stack(void); - -// Explicitly mark this as noinline to make sure the regs variable -// is effectively at the top of the stack: otherwise, in builds where -// LTO is enabled and a lot of inlining takes place we risk a stack -// layout where regs is lower on the stack than pointers which have -// just been allocated but not yet marked, and get incorrectly sweeped. -MP_NOINLINE void gc_collect_regs_and_stack(void) { - regs_t regs; - gc_helper_get_regs(regs); - // GC stack (and regs because we captured them) - void **regs_ptr = (void **)(void *)®s; - gc_collect_root(regs_ptr, ((uintptr_t)MP_STATE_THREAD(stack_top) - (uintptr_t)®s) / sizeof(uintptr_t)); -} +#if MICROPY_ENABLE_GC void gc_collect(void) { // gc_dump_info(); gc_collect_start(); - gc_collect_regs_and_stack(); + gc_helper_collect_regs_and_stack(); #if MICROPY_PY_THREAD mp_thread_gc_others(); #endif |