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py/emitnative: Use macros instead of raw offsetof for slot locations. 

Old globals are now stored in the second slot (ip in mp_code_state_t) to
make things simpler for viper.
This commit is contained in:
Damien George 2018-09-15 22:27:58 +10:00
parent a676b5acf6
commit f12e039c2b
1 changed files with 7 additions and 5 deletions
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12
py/emitnative.c
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@ -84,6 +84,8 @@
#define CAN_USE_REGS_FOR_LOCALS(emit) ((emit)->scope->exc_stack_size == 0)
// Indices within the local C stack for various variables
#define LOCAL_IDX_FUN_OBJ(emit) (offsetof(mp_code_state_t, fun_bc) / sizeof(uintptr_t))
#define LOCAL_IDX_OLD_GLOBALS(emit) (offsetof(mp_code_state_t, ip) / sizeof(uintptr_t))
#define LOCAL_IDX_EXC_VAL(emit) ((emit)->stack_start + NLR_BUF_IDX_RET_VAL)
#define LOCAL_IDX_EXC_HANDLER_PC(emit) ((emit)->stack_start + NLR_BUF_IDX_LOCAL_1)
#define LOCAL_IDX_EXC_HANDLER_UNWIND(emit) ((emit)->stack_start + NLR_BUF_IDX_LOCAL_2)
@ -392,7 +394,7 @@ STATIC void emit_native_start_pass(emit_t *emit, pass_kind_t pass, scope_t *scop
#endif
// set code_state.fun_bc
ASM_MOV_LOCAL_REG(emit->as, offsetof(mp_code_state_t, fun_bc) / sizeof(uintptr_t), REG_ARG_1);
ASM_MOV_LOCAL_REG(emit->as, LOCAL_IDX_FUN_OBJ(emit), REG_ARG_1);
// set code_state.ip (offset from start of this function to prelude info)
// XXX this encoding may change size
@ -931,12 +933,12 @@ STATIC void emit_native_global_exc_entry(emit_t *emit) {
if (!emit->do_viper_types) {
// Set new globals
ASM_MOV_REG_LOCAL(emit->as, REG_ARG_1, offsetof(mp_code_state_t, fun_bc) / sizeof(uintptr_t));
ASM_MOV_REG_LOCAL(emit->as, REG_ARG_1, LOCAL_IDX_FUN_OBJ(emit));
ASM_LOAD_REG_REG_OFFSET(emit->as, REG_ARG_1, REG_ARG_1, offsetof(mp_obj_fun_bc_t, globals) / sizeof(uintptr_t));
emit_call(emit, MP_F_NATIVE_SWAP_GLOBALS);
// Save old globals (or NULL if globals didn't change)
ASM_MOV_LOCAL_REG(emit->as, offsetof(mp_code_state_t, old_globals) / sizeof(uintptr_t), REG_RET);
ASM_MOV_LOCAL_REG(emit->as, LOCAL_IDX_OLD_GLOBALS(emit), REG_RET);
}
if (emit->scope->exc_stack_size == 0) {
@ -976,7 +978,7 @@ STATIC void emit_native_global_exc_entry(emit_t *emit) {
if (!emit->do_viper_types) {
// Restore old globals
ASM_MOV_REG_LOCAL(emit->as, REG_ARG_1, offsetof(mp_code_state_t, old_globals) / sizeof(uintptr_t));
ASM_MOV_REG_LOCAL(emit->as, REG_ARG_1, LOCAL_IDX_OLD_GLOBALS(emit));
emit_call(emit, MP_F_NATIVE_SWAP_GLOBALS);
}
@ -996,7 +998,7 @@ STATIC void emit_native_global_exc_exit(emit_t *emit) {
if (NEED_GLOBAL_EXC_HANDLER(emit)) {
if (!emit->do_viper_types) {
// Get old globals
ASM_MOV_REG_LOCAL(emit->as, REG_ARG_1, offsetof(mp_code_state_t, old_globals) / sizeof(uintptr_t));
ASM_MOV_REG_LOCAL(emit->as, REG_ARG_1, LOCAL_IDX_OLD_GLOBALS(emit));
if (emit->scope->exc_stack_size == 0) {
// Optimisation: if globals didn't change then don't restore them and don't do nlr_pop