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unix/gccollect: Fallback to setjmp-based register fetching automatically. 

Now, if we build for an architecture which doesn't have dedicated support
for getting registers for GC scanning, fallback to setjmp-based method
automatically. It's still possible to force setjmp-based implementation
on archs with dedicated support (e.g. for testing, or for peculiar calling
conventions/optimizations).
This commit is contained in:
Paul Sokolovsky 2015-11-07 23:04:42 +03:00
parent 57e00ef262
commit 6e68a68d18
1 changed files with 30 additions and 16 deletions
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46
unix/gccollect.c
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@ -31,22 +31,15 @@
#if MICROPY_ENABLE_GC
#if MICROPY_GCREGS_SETJMP
#include <setjmp.h>
typedef jmp_buf regs_t;
STATIC void gc_helper_get_regs(regs_t arr) {
setjmp(arr);
}
#else // !MICROPY_GCREGS_SETJMP
// 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.
#ifdef __x86_64__
#if defined(__x86_64__)
typedef mp_uint_t regs_t[6];
STATIC void gc_helper_get_regs(regs_t arr) {
@ -77,9 +70,9 @@ STATIC void gc_helper_get_regs(regs_t arr) {
arr[4] = r14;
arr[5] = r15;
}
#endif
#ifdef __i386__
#elif defined(__i386__)
typedef mp_uint_t regs_t[4];
STATIC void gc_helper_get_regs(regs_t arr) {
@ -92,9 +85,9 @@ STATIC void gc_helper_get_regs(regs_t arr) {
arr[2] = edi;
arr[3] = ebp;
}
#endif
#if defined(__thumb2__) || defined(__thumb__) || defined(__arm__)
#elif defined(__thumb2__) || defined(__thumb__) || defined(__arm__)
typedef mp_uint_t regs_t[10];
STATIC void gc_helper_get_regs(regs_t arr) {
@ -119,9 +112,30 @@ STATIC void gc_helper_get_regs(regs_t arr) {
arr[8] = r12;
arr[9] = r13;
}
#endif
#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
void gc_collect(void) {
//gc_dump_info();