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py: Calculate maximum exception stack size in compiler.

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Damien George
2014-03-27 10:55:21 +00:00
parent 945a01c4e3
commit 8dcc0c7924
5 changed files with 77 additions and 44 deletions
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42
py/vm.c
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@@ -45,6 +45,16 @@ typedef enum {
#define SET_TOP(val) *sp = (val)
mp_vm_return_kind_t mp_execute_byte_code(const byte *code, const mp_obj_t *args, uint n_args, const mp_obj_t *args2, uint n_args2, uint n_state, mp_obj_t *ret) {
const byte *ip = code;
// get code info size, and skip line number table
machine_uint_t code_info_size = ip[0] | (ip[1] << 8) | (ip[2] << 16) | (ip[3] << 24);
ip += code_info_size;
// bytecode prelude: exception stack size; 16 bit uint for now
machine_uint_t n_exc_stack = ip[0] | (ip[1] << 8);
ip += 2;
// allocate state for locals and stack
mp_obj_t temp_state[10];
mp_obj_t *state = &temp_state[0];
@@ -53,6 +63,14 @@ mp_vm_return_kind_t mp_execute_byte_code(const byte *code, const mp_obj_t *args,
}
mp_obj_t *sp = &state[0] - 1;
// allocate state for exceptions
mp_exc_stack exc_state[4];
mp_exc_stack *exc_stack = &exc_state[0];
if (n_exc_stack > 4) {
exc_stack = m_new(mp_exc_stack, n_exc_stack);
}
mp_exc_stack *exc_sp = &exc_stack[0] - 1;
// init args
for (uint i = 0; i < n_args; i++) {
state[n_state - 1 - i] = args[i];
@@ -61,26 +79,16 @@ mp_vm_return_kind_t mp_execute_byte_code(const byte *code, const mp_obj_t *args,
state[n_state - 1 - n_args - i] = args2[i];
}
const byte *ip = code;
// get code info size
machine_uint_t code_info_size = ip[0] | (ip[1] << 8) | (ip[2] << 16) | (ip[3] << 24);
ip += code_info_size;
// execute prelude to make any cells (closed over variables)
{
for (uint n_local = *ip++; n_local > 0; n_local--) {
uint local_num = *ip++;
if (local_num < n_args + n_args2) {
state[n_state - 1 - local_num] = mp_obj_new_cell(state[n_state - 1 - local_num]);
} else {
state[n_state - 1 - local_num] = mp_obj_new_cell(MP_OBJ_NULL);
}
// bytecode prelude: initialise closed over variables
for (uint n_local = *ip++; n_local > 0; n_local--) {
uint local_num = *ip++;
if (local_num < n_args + n_args2) {
state[n_state - 1 - local_num] = mp_obj_new_cell(state[n_state - 1 - local_num]);
} else {
state[n_state - 1 - local_num] = mp_obj_new_cell(MP_OBJ_NULL);
}
}
mp_exc_stack exc_stack[4];
mp_exc_stack *exc_sp = &exc_stack[0] - 1;
// execute the byte code
mp_vm_return_kind_t vm_return_kind = mp_execute_byte_code_2(code, &ip, &state[n_state - 1], &sp, exc_stack, &exc_sp, MP_OBJ_NULL);