diff options
Diffstat (limited to 'test/src/test-c-machine.machine.c')
| -rw-r--r-- | test/src/test-c-machine.machine.c | 532 |
1 files changed, 532 insertions, 0 deletions
diff --git a/test/src/test-c-machine.machine.c b/test/src/test-c-machine.machine.c new file mode 100644 index 0000000..d4c924d --- /dev/null +++ b/test/src/test-c-machine.machine.c @@ -0,0 +1,532 @@ +#include <stdint.h> // explicit types +#include <stddef.h> // NULL + +#define IS_SET(idx, bitset) ((bitset[idx >> 3] & (1 << (idx & 7))) != 0) +#define SET_BIT(idx, bitset) bitset[idx >> 3] |= (1 << (idx & 7)); +#define CLEARBIT(idx, bitset) bitset[idx >> 3] &= (1 << (idx & 7)) ^ 0xFF; + +// error return codes +#define SCXML_ERR_OK 0 +#define SCXML_ERR_IDLE 1 +#define SCXML_ERR_DONE 2 +#define SCXML_ERR_MISSING_CALLBACK 3 +#define SCXML_ERR_FOREACH_DONE 4 +#define SCXML_ERR_EXEC_CONTENT 5 +#define SCXML_ERR_INVALID_TARGET 6 +#define SCXML_ERR_INVALID_TYPE 7 + +#define SCXML_NUMBER_STATES 5 +#define SCXML_NUMBER_TRANSITIONS 4 + +#define SCXML_TRANS_SPONTANEOUS 0x01 +#define SCXML_TRANS_TARGETLESS 0x02 +#define SCXML_TRANS_INTERNAL 0x04 + +#define SCXML_STATE_ATOMIC 0x01 +#define SCXML_STATE_PARALLEL 0x02 +#define SCXML_STATE_COMPOUND 0x03 +#define SCXML_STATE_FINAL 0x04 +#define SCXML_STATE_HISTORY_DEEP 0x05 +#define SCXML_STATE_HISTORY_SHALLOW 0x06 +#define SCXML_STATE_INITIAL 0x07 + +#define SCXML_CTX_PRISTINE 0x00 +#define SCXML_CTX_SPONTANEOUS 0x01 +#define SCXML_CTX_INITIALIZED 0x02 +#define SCXML_CTX_TOP_LEVEL_FINAL 0x04 +#define SCXML_CTX_TRANSITION_FOUND 0x08 + +#define ELEM_DATA_IS_SET(data) (data->id != NULL) +#define ELEM_PARAM_IS_SET(param) (param->name != NULL) + + +typedef struct scxml_transition scxml_transition; +typedef struct scxml_state scxml_state; +typedef struct scxml_ctx scxml_ctx; +typedef struct scxml_invoke scxml_invoke; + +typedef struct scxml_elem_send scxml_elem_send; +typedef struct scxml_elem_param scxml_elem_param; +typedef struct scxml_elem_data scxml_elem_data; +typedef struct scxml_elem_foreach scxml_elem_foreach; + +typedef void* (*dequeue_internal_cb_t)(const scxml_ctx* ctx); +typedef void* (*dequeue_external_cb_t)(const scxml_ctx* ctx); +typedef int (*is_enabled_cb_t)(const scxml_ctx* ctx, const scxml_transition* transition, const void* event); +typedef int (*is_true_cb_t)(const scxml_ctx* ctx, const char* expr); +typedef int (*exec_content_t)(const scxml_ctx* ctx, const scxml_state* state, const void* event); +typedef int (*raise_done_event_t)(const scxml_ctx* ctx, const scxml_state* state); +typedef int (*invoke_t)(const scxml_ctx* ctx, const scxml_state* s, const scxml_invoke* x); + +typedef int (*exec_content_log_t)(const scxml_ctx* ctx, const char* label, const char* expr); +typedef int (*exec_content_raise_t)(const scxml_ctx* ctx, const char* event); +typedef int (*exec_content_send_t)(const scxml_ctx* ctx, const scxml_elem_send* send); +typedef int (*exec_content_foreach_init_t)(const scxml_ctx* ctx, const scxml_elem_foreach* foreach); +typedef int (*exec_content_foreach_next_t)(const scxml_ctx* ctx, const scxml_elem_foreach* foreach); +typedef int (*exec_content_foreach_done_t)(const scxml_ctx* ctx, const scxml_elem_foreach* foreach); +typedef int (*exec_content_assign_t)(const scxml_ctx* ctx, const char* location, const char* expr); +typedef int (*exec_content_init_t)(const scxml_ctx* ctx, const scxml_elem_data* data); +typedef int (*exec_content_cancel_t)(const scxml_ctx* ctx, const char* sendid, const char* sendidexpr); +typedef int (*exec_content_finalize_t)(const scxml_ctx* ctx, const scxml_invoke* invoker, const void* event); +typedef int (*exec_content_script_t)(const scxml_ctx* ctx, const char* src, const char* content); + +struct scxml_elem_data { + const char* id; + const char* src; + const char* expr; + const char* content; +}; + +struct scxml_state { + const char* name; // eventual name + exec_content_t on_entry; // on entry handlers + exec_content_t on_exit; // on exit handlers + invoke_t invoke; // invocations + char children[1]; // all children + char completion[1]; // default completion + char ancestors[1]; // all ancestors + const scxml_elem_data* data; + uint8_t type; // atomic, parallel, compound, final, history +}; + +struct scxml_transition { + uint16_t source; + char target[1]; + const char* event; + const char* condition; + exec_content_t on_transition; + uint8_t type; + char conflicts[1]; + char exit_set[1]; +}; + +struct scxml_elem_foreach { + const char* array; + const char* item; + const char* index; +}; + +struct scxml_elem_param { + const char* name; + const char* expr; + const char* location; +}; + +struct scxml_elem_invoke { + const char* type; + const char* typeexpr; + const char* src; + const char* srcexpr; + const char* id; + const char* idlocation; + const char* namelist; + uint8_t autoforward; + const scxml_elem_param* params; + const exec_content_finalize_t* finalize; + const char* content; + void* user_data; +}; + +struct scxml_elem_send { + const char* event; + const char* eventexpr; + const char* target; + const char* targetexpr; + const char* type; + const char* typeexpr; + const char* id; + const char* idlocation; + const char* delay; + const char* delayexpr; + const char* namelist; + const char* content; + const scxml_elem_param* params; + void* user_data; +}; + +struct scxml_ctx { + uint8_t flags; + + char config[1]; + char history[1]; + char pending_invokes[1]; + char initialized_data[1]; + + void* user_data; + + dequeue_internal_cb_t dequeue_internal; + dequeue_external_cb_t dequeue_external; + is_enabled_cb_t is_enabled; + is_true_cb_t is_true; + raise_done_event_t raise_done_event; + + exec_content_log_t exec_content_log; + exec_content_raise_t exec_content_raise; + exec_content_send_t exec_content_send; + exec_content_foreach_init_t exec_content_foreach_init; + exec_content_foreach_next_t exec_content_foreach_next; + exec_content_foreach_done_t exec_content_foreach_done; + exec_content_assign_t exec_content_assign; + exec_content_init_t exec_content_init; + exec_content_cancel_t exec_content_cancel; + exec_content_script_t exec_content_script; + invoke_t invoke; +}; + +scxml_elem_data scxml_elem_datas[4] = { + { "Var1", NULL, NULL, NULL }, + { NULL, NULL, NULL, NULL }, + { "Var2", NULL, "1", NULL }, + { NULL, NULL, NULL, NULL } +}; + +int s1_on_entry_0(const scxml_ctx* ctx, const scxml_state* state, const void* event) { + int err = SCXML_ERR_OK; + if (ctx->exec_content_assign != NULL) { + if ((ctx->exec_content_assign(ctx, "Var1", "Var2")) != SCXML_ERR_OK) return err; + } else { + return SCXML_ERR_MISSING_CALLBACK; + } + return SCXML_ERR_OK; +} + +int s1_on_entry(const scxml_ctx* ctx, const scxml_state* state, const void* event) { + s1_on_entry_0(ctx, state, event); + return SCXML_ERR_OK; +} + +int pass_on_entry_0(const scxml_ctx* ctx, const scxml_state* state, const void* event) { + int err = SCXML_ERR_OK; + if (ctx->exec_content_log != NULL) { + if ((ctx->exec_content_log(ctx, "Outcome", "'pass'")) != SCXML_ERR_OK) return err; + } else { + return SCXML_ERR_MISSING_CALLBACK; + } + return SCXML_ERR_OK; +} + +int pass_on_entry(const scxml_ctx* ctx, const scxml_state* state, const void* event) { + pass_on_entry_0(ctx, state, event); + return SCXML_ERR_OK; +} + +int fail_on_entry_0(const scxml_ctx* ctx, const scxml_state* state, const void* event) { + int err = SCXML_ERR_OK; + if (ctx->exec_content_log != NULL) { + if ((ctx->exec_content_log(ctx, "Outcome", "'fail'")) != SCXML_ERR_OK) return err; + } else { + return SCXML_ERR_MISSING_CALLBACK; + } + return SCXML_ERR_OK; +} + +int fail_on_entry(const scxml_ctx* ctx, const scxml_state* state, const void* event) { + fail_on_entry_0(ctx, state, event); + return SCXML_ERR_OK; +} + +scxml_state scxml_states[5] = { + { NULL, NULL, NULL, NULL, { 0x1e /* 01111, 1 2 3 4 */ }, { 0x02 /* 01000, 1 */ }, { 0x00 /* 00000, */ }, (const scxml_elem_data*)&scxml_elem_datas[0], SCXML_STATE_COMPOUND }, + { "s0", NULL, NULL, NULL, { 0x00 /* 00000, */ }, { 0x00 /* 00000, */ }, { 0x01 /* 10000, 0 */ }, NULL, SCXML_STATE_ATOMIC }, + { "s1", s1_on_entry, NULL, NULL, { 0x00 /* 00000, */ }, { 0x00 /* 00000, */ }, { 0x01 /* 10000, 0 */ }, (const scxml_elem_data*)&scxml_elem_datas[1], SCXML_STATE_ATOMIC }, + { "pass", pass_on_entry, NULL, NULL, { 0x00 /* 00000, */ }, { 0x00 /* 00000, */ }, { 0x01 /* 10000, 0 */ }, NULL, SCXML_STATE_FINAL }, + { "fail", fail_on_entry, NULL, NULL, { 0x00 /* 00000, */ }, { 0x00 /* 00000, */ }, { 0x01 /* 10000, 0 */ }, NULL, SCXML_STATE_FINAL } +}; + +scxml_transition scxml_transitions[4] = { + { 1, { 0x04 /* 00100 */ }, NULL, "typeof Var2 === 'undefined' ", NULL, SCXML_TRANS_SPONTANEOUS, { 0x0f /* 1111 */ }, { 0x1e /* 01111 */ } }, + { 1, { 0x10 /* 00001 */ }, NULL, NULL, NULL, SCXML_TRANS_SPONTANEOUS, { 0x0f /* 1111 */ }, { 0x1e /* 01111 */ } }, + { 2, { 0x08 /* 00010 */ }, NULL, "Var1===Var2", NULL, SCXML_TRANS_SPONTANEOUS, { 0x0f /* 1111 */ }, { 0x1e /* 01111 */ } }, + { 2, { 0x10 /* 00001 */ }, NULL, NULL, NULL, SCXML_TRANS_SPONTANEOUS, { 0x0f /* 1111 */ }, { 0x1e /* 01111 */ } } +}; + +#ifdef SCXML_VERBOSE +void printStateNames(const char* a) { + const char* seperator = ""; + for (int i = 0; i < SCXML_NUMBER_STATES; i++) { + if (IS_SET(i, a)) { + printf("%s%s", seperator, (scxml_states[i].name != NULL ? scxml_states[i].name : "UNK")); + seperator = ", "; + } + } + printf("\n"); +} + +void printBitsetIndices(const char* a, size_t length) { + const char* seperator = ""; + for (int i = 0; i < length; i++) { + if (IS_SET(i, a)) { + printf("%s%d", seperator, i); + seperator = ", "; + } + } + printf("\n"); +} +#endif + +void bit_or(char* dest, const char* mask, size_t length) { + for (int i = 0; i < length; ++i) { + dest[i] |= mask[i]; + } +} + +void bit_copy(char* dest, const char* source, size_t length) { + for (int i = 0; i < length; ++i) { + dest[i] = source[i]; + } +} + +int bit_has_and(const char* a, const char* b, size_t length) { + for (int i = 0; i < length; ++i) { + if (a[i] & b[i]) + return true; + } + return false; +} + +void bit_and_not(char* dest, const char* mask, size_t length) { + for (int i = 0; i < length; ++i) { + dest[i] &= ~mask[i]; + } +} + +int bit_any_set(const char* a, size_t length) { + for (int i = 0; i < length; ++i) { + if (a[i] > 0) + return true; + } + return false; +} + +int scxml_step(scxml_ctx* ctx) { + +#ifdef SCXML_VERBOSE + printStateNames(ctx->config); +#endif + +MACRO_STEP: + ctx->flags &= ~SCXML_CTX_TRANSITION_FOUND; + + if (ctx->flags & SCXML_CTX_TOP_LEVEL_FINAL) + return SCXML_ERR_DONE; + + int err = SCXML_ERR_OK; + char conflicts[1] = {0}; + char target_set[1] = {0}; + char exit_set[1] = {0}; + char trans_set[1] = {0}; + char entry_set[1] = {0}; + + void* event; + if (ctx->flags == SCXML_CTX_PRISTINE) { + bit_or(target_set, scxml_states[0].completion, 1); + ctx->flags |= SCXML_CTX_SPONTANEOUS | SCXML_CTX_INITIALIZED; + goto COMPLETE_CONFIG; + } + + if (ctx->flags & SCXML_CTX_SPONTANEOUS) { + event = NULL; + goto SELECT_TRANSITIONS; + } + if ((event = ctx->dequeue_internal(ctx)) != NULL) { + goto SELECT_TRANSITIONS; + } + if ((event = ctx->dequeue_external(ctx)) != NULL) { + goto SELECT_TRANSITIONS; + } + +SELECT_TRANSITIONS: + for (int i = 0; i < SCXML_NUMBER_TRANSITIONS; i++) { + // is the transition active? + if (IS_SET(scxml_transitions[i].source, ctx->config)) { + // is it non-conflicting? + if (!IS_SET(i, conflicts)) { + // is it enabled? + if (ctx->is_enabled(ctx, &scxml_transitions[i], event) > 0) { + // remember that we found a transition + ctx->flags |= SCXML_CTX_TRANSITION_FOUND; + + // transitions that are pre-empted + bit_or(conflicts, scxml_transitions[i].conflicts, 1); + + // states that are directly targeted (resolve as entry-set later) + bit_or(target_set, scxml_transitions[i].target, 1); + + // states that will be left + bit_or(exit_set, scxml_transitions[i].exit_set, 1); + + SET_BIT(i, trans_set); + } + } + } + } + + if (ctx->flags & SCXML_CTX_TRANSITION_FOUND) { + ctx->flags |= SCXML_CTX_SPONTANEOUS; + } else { + ctx->flags &= ~SCXML_CTX_SPONTANEOUS; + goto MACRO_STEP; + } + +REMEMBER_HISTORY: + // are my ancestors in the exit set? + for (int i = 0; i < SCXML_NUMBER_STATES; i++) { + if (IS_SET(i, ctx->config) && bit_has_and(exit_set, scxml_states[i].ancestors, 1)) { + SET_BIT(i, ctx->history); + } + } + +#ifdef SCXML_VERBOSE + printf("Exiting: "); + printStateNames(exit_set); +#endif + +EXIT_STATES: + for (int i = SCXML_NUMBER_STATES - 1; i >= 0; i--) { + if (IS_SET(i, exit_set) && IS_SET(i, ctx->config)) { + // call all on exit handlers + if (scxml_states[i].on_exit != NULL) { + if((err = scxml_states[i].on_exit(ctx, &scxml_states[i], event)) != SCXML_ERR_OK) + return err; + } + CLEARBIT(i, ctx->config); + } + } + +COMPLETE_CONFIG: + // calculate new entry set + bit_copy(entry_set, target_set, 1); + + // iterate for ancestors + for (int i = 0; i < SCXML_NUMBER_STATES; i++) { + if (IS_SET(i, entry_set)) { + bit_or(entry_set, scxml_states[i].ancestors, 1); + } + } + +ADD_DESCENDANTS: + // iterate for descendants + for (int i = 0; i < SCXML_NUMBER_STATES; i++) { + if (IS_SET(i, entry_set)) { + switch (scxml_states[i].type) { + case SCXML_STATE_PARALLEL: { + bit_or(entry_set, scxml_states[i].completion, 1); + break; + } + case SCXML_STATE_INITIAL: { + for (int j = 0; j < SCXML_NUMBER_TRANSITIONS; j++) { + if (scxml_transitions[j].source == i) { + SET_BIT(j, trans_set); + CLEARBIT(i, entry_set); + bit_or(entry_set, scxml_transitions[j].target, 1); + // one target may have been above, reestablish completion + goto ADD_DESCENDANTS; + } + } + break; + } + case SCXML_STATE_COMPOUND: { // we need to check whether one child is already in entry_set + if (!bit_has_and(entry_set, scxml_states[i].children, 1)) { + bit_or(entry_set, scxml_states[i].completion, 1); + } + break; + } + } + } + } + +#ifdef SCXML_VERBOSE + printf("Transitions: "); + printBitsetIndices(trans_set, sizeof(char) * 8 * 1); +#endif + +TAKE_TRANSITIONS: + for (int i = 0; i < SCXML_NUMBER_TRANSITIONS; i++) { + if (IS_SET(i, trans_set)) { + // call executable content in transition + if (scxml_transitions[i].on_transition != NULL) { + if((err = scxml_transitions[i].on_transition(ctx, + &scxml_states[scxml_transitions[i].source], + event)) != SCXML_ERR_OK) + return err; + } + } + } + +#ifdef SCXML_VERBOSE + printf("Entering: "); + printStateNames(entry_set); +#endif + +ENTER_STATES: + for (int i = 0; i < SCXML_NUMBER_STATES; i++) { + if (IS_SET(i, entry_set) && !IS_SET(i, ctx->config)) { + SET_BIT(i, ctx->config); + if (scxml_states[i].on_entry != NULL) { + if((err = scxml_states[i].on_entry(ctx, &scxml_states[i], event)) != SCXML_ERR_OK) + return err; + } + + // initialize data + if(!IS_SET(i, ctx->initialized_data)) { + if (scxml_states[i].data != NULL && ctx->exec_content_init != NULL) { + ctx->exec_content_init(ctx, scxml_states[i].data); + } + SET_BIT(i, ctx->initialized_data); + } + + // handle final states + if (scxml_states[i].type == SCXML_STATE_FINAL) { + if (scxml_states[i].ancestors[0] == 0x01) { + ctx->flags |= SCXML_CTX_TOP_LEVEL_FINAL; + } else { + // raise done event + size_t parent = 0; + for (int j = 0; j < SCXML_NUMBER_STATES; j++) { + // we could trade runtime for memory here by saving the parent index + if (!IS_SET(j, scxml_states[i].ancestors)) { + if (parent != 0) { + break; + } + continue; + } else { + parent = j; + } + } + ctx->raise_done_event(ctx, &scxml_states[parent]); + } + + /** + * are we the last final state to leave a parallel state?: + * 1. Gather all parallel states in our ancestor chain + * 2. Find all states for which these parallels are ancestors + * 3. Iterate all active final states and remove their ancestors + * 4. If a state remains, not all children of a parallel are final + */ + for (int j = 0; j < SCXML_NUMBER_STATES; j++) { + if (scxml_states[j].type == SCXML_STATE_PARALLEL) { + char parallel_children[2] = {0, 0}; + size_t parallel = j; + for (int k = 0; k < SCXML_NUMBER_STATES; k++) { + if (IS_SET(parallel, scxml_states[k].ancestors) && IS_SET(k, ctx->config)) { + if (scxml_states[k].type == SCXML_STATE_FINAL) { + bit_and_not(parallel_children, scxml_states[k].ancestors, 2); + } else { + SET_BIT(k, parallel_children); + } + } + } + if (!bit_any_set(parallel_children, 2)) { + ctx->raise_done_event(ctx, &scxml_states[parallel]); + } + } + } + + } + + } + } + + return SCXML_ERR_OK; +} + |