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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#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];
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));
}
void gc_collect(void) {
//gc_dump_info();
gc_collect_start();
gc_collect_regs_and_stack();
#if MICROPY_PY_THREAD
mp_thread_gc_others();
#endif
#if MICROPY_EMIT_NATIVE
mp_unix_mark_exec();
#endif
gc_collect_end();
//printf("-----\n");
//gc_dump_info();
}
#endif //MICROPY_ENABLE_GC
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