diff options
Diffstat (limited to 'mixlib')
| -rw-r--r-- | mixlib/mix_vm.c | 32 | ||||
| -rw-r--r-- | mixlib/mix_vm.h | 6 |
2 files changed, 26 insertions, 12 deletions
diff --git a/mixlib/mix_vm.c b/mixlib/mix_vm.c index 2c41097..38ce5a9 100644 --- a/mixlib/mix_vm.c +++ b/mixlib/mix_vm.c @@ -308,6 +308,25 @@ mix_vm_get_prog_count (const mix_vm_t *vm) return get_loc_ (vm); } +/* Reposition program counter and reset state so that a loaded + program can be restarted. +*/ +void +mix_vm_reset_program (mix_vm_t *vm) +{ + guint k; + g_return_if_fail (vm != NULL); + reset_loc_ (vm); + halt_ (vm, FALSE); + set_rA_ (vm, MIX_WORD_ZERO); + set_rX_ (vm, MIX_WORD_ZERO); + set_rJ_ (vm, MIX_WORD_ZERO); + for ( k = 1; k < IREG_NO_+1; ++k ) + set_rI_ (vm, k, MIX_WORD_ZERO); + set_over_ (vm, FALSE); + set_cmp_ (vm, mix_EQ); +} + /* continue execution of instructions in memory */ int mix_vm_run (mix_vm_t *vm) @@ -315,12 +334,6 @@ mix_vm_run (mix_vm_t *vm) mix_ins_t ins; g_return_val_if_fail (vm != NULL, MIX_VM_ERROR); - if ( is_halted_ (vm) ) - { - reset_loc_ (vm); /* set current location to start address */ - halt_ (vm, FALSE); - } - while ( !is_halted_ (vm) ) { mix_word_to_ins_uncheck (get_cell_ (vm, get_loc_ (vm)), ins); @@ -340,12 +353,7 @@ mix_vm_exec_next (mix_vm_t *vm) mix_ins_t ins; g_return_val_if_fail (vm != NULL, MIX_VM_ERROR); if (get_loc_ (vm) >= MIX_VM_CELL_NO) halt_ (vm, TRUE); - if (is_halted_ (vm)) - { - reset_loc_ (vm); /* set current location to start address */ - halt_ (vm, FALSE); - return MIX_VM_HALT; - } + if (is_halted_ (vm)) return MIX_VM_HALT; mix_word_to_ins_uncheck (get_cell_ (vm, get_loc_ (vm)), ins); if (!(*ins_handlers_[ins.opcode]) (vm, &ins)) return MIX_VM_ERROR; diff --git a/mixlib/mix_vm.h b/mixlib/mix_vm.h index cf4965c..62ba34d 100644 --- a/mixlib/mix_vm.h +++ b/mixlib/mix_vm.h @@ -127,6 +127,12 @@ mix_vm_get_symbol_table (const mix_vm_t *vm); extern mix_address_t mix_vm_get_prog_count (const mix_vm_t *vm); +/* Reposition program counter and reset state so that a loaded + program can be restarted. +*/ +extern void +mix_vm_reset_program (mix_vm_t *vm); + /* continue execution of instructions in memory */ /* Possible outcomes */ enum { |