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py: In VM, for selective ip saving, store 1 byte past last opcode. 

This is for efficiency, so we don't need to subtract 1 from the ip
before storing it to code_state->ip.  It saves a lot of ROM bytes on
unix and stmhal.
This commit is contained in:
Damien George 2014-12-29 00:29:59 +00:00
parent 23f1b5ff66
commit f89d659e3b
1 changed files with 12 additions and 3 deletions
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15
py/vm.c
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@ -103,11 +103,11 @@ typedef enum {
mp_vm_return_kind_t mp_execute_bytecode(mp_code_state *code_state, volatile mp_obj_t inject_exc) {
#define SELECTIVE_EXC_IP (0)
#if SELECTIVE_EXC_IP
#define MARK_EXC_IP_SELECTIVE() { code_state->ip = ip - 1; }
#define MARK_EXC_IP_SELECTIVE() { code_state->ip = ip; } /* stores ip 1 byte past last opcode */
#define MARK_EXC_IP_GLOBAL()
#else
#define MARK_EXC_IP_SELECTIVE()
#define MARK_EXC_IP_GLOBAL() { code_state->ip = ip; }
#define MARK_EXC_IP_GLOBAL() { code_state->ip = ip; } /* stores ip pointing to last opcode */
#endif
#if MICROPY_OPT_COMPUTED_GOTO
#include "vmentrytable.h"
@ -545,7 +545,11 @@ unwind_jump:;
ENTRY(MP_BC_SETUP_EXCEPT):
ENTRY(MP_BC_SETUP_FINALLY): {
MARK_EXC_IP_SELECTIVE();
PUSH_EXC_BLOCK((*code_state->ip == MP_BC_SETUP_FINALLY) ? 1 : 0);
#if SELECTIVE_EXC_IP
PUSH_EXC_BLOCK((code_state->ip[-1] == MP_BC_SETUP_FINALLY) ? 1 : 0);
#else
PUSH_EXC_BLOCK((code_state->ip[0] == MP_BC_SETUP_FINALLY) ? 1 : 0);
#endif
DISPATCH();
}
@ -1005,6 +1009,11 @@ pending_exception_check:
exception_handler:
// exception occurred
#if SELECTIVE_EXC_IP
// with selective ip, we store the ip 1 byte past the opcode, so move ptr back
code_state->ip -= 1;
#endif
// check if it's a StopIteration within a for block
if (*code_state->ip == MP_BC_FOR_ITER && mp_obj_is_subclass_fast(mp_obj_get_type(nlr.ret_val), &mp_type_StopIteration)) {
const byte *ip = code_state->ip + 1;