fnasso_error fnasso_context_set_cache_name(fnasso_context *ctx, const char* ccache_name)
{
F_BEGIN();
if (!ctx) E_RETURN(FNASSO_ERR_NO_CONTEXT_SUPPLIED);
if (!ccache_name)
{
if (ctx->ccache_filename) free(ctx->ccache_filename);
ctx->ccache_filename = NULL;
EVENT("Credentials cache filename has been set to OS default");
}
else
{
if (strlen(ccache_name))
{
ctx->ccache_filename = (char *) realloc(ctx->ccache_filename, strlen(ccache_name) + 1);
strcpy(ctx->ccache_filename, ccache_name);
EVENT("Credentials cache filename is now (%s)", ctx->ccache_filename);
}
else
{
E_RETURN(FNASSO_ERR_NO_CCACHE_NAME);
}
}
RETURN(FNASSO_ERR_NONE);
}
ssod_error ssod_thread_start(ssod_iface *iface)
{
F_BEGIN();
int retval;
ssod_error error;
if (!iface) E_RETURN(SSOD_ERR_IFACE_NOT_SUPPLIED);
if (!iface->thread)
{
error = ssod_thread_init(iface);
if (error) E_THROW(error);
}
if (iface->thread->status == SSOD_THREAD_STATUS_RUNNING) RETURN(SSOD_ERR_NONE);
iface->thread->status = SSOD_THREAD_STATUS_RUNNING;
retval = pthread_create(&iface->thread->id, NULL, ssod_network_watcher, iface);
if (retval)
{
iface->thread->status = SSOD_THREAD_STATUS_STOPPED;
E_RETURN(SSOD_ERR_EXTERNAL, "pthread_create", error_message(retval));
}
EVENT("[%s] thread started", iface->name);
RETURN(SSOD_ERR_NONE);
}
fnasso_error fnasso_kdc_init(fnasso_context *ctx)
{
F_BEGIN();
krb5_error_code kerberos_error;
krb5_context *context;
if (!ctx->kdc)
{
ctx->kdc = (fnasso_kdc*) calloc(1, sizeof(fnasso_kdc));
}
if (!ctx->kdc->kctx)
{
context = ctx->kdc->kctx = (krb5_context *) malloc(sizeof (krb5_context));
kerberos_error = krb5_init_context(context);
if (kerberos_error)
{
fnasso_kdc_free(ctx);
E_RETURN(FNASSO_ERR_EXTERNAL, "krb5_init_context", error_message(kerberos_error));
}
DEBUG("krb5_init_context OK");
}
else
{
context = ctx->kdc->kctx;
DEBUG("context allready initialized");
}
// Setup the right roaming kerberos realm
if (ctx->roaming_realm)
{
EVENT("found kerberos roaming realm (%s), overwriting default realm", ctx->roaming_realm);
kerberos_error = krb5_set_default_realm(*context, ctx->roaming_realm);
if (kerberos_error)
{
fnasso_kdc_free(ctx);
E_RETURN(FNASSO_ERR_EXTERNAL, "krb5_set_default_realm", error_message(kerberos_error));
}
DEBUG("krb5_set_default_realm OK");
}
else
{
WARN("default realm not found in context, using default realm from /etc/krb5.conf");
}
RETURN(FNASSO_ERR_NONE);
}
/**
** Called to perform WordFinder creation and text extraction on a PDF document
**
** @param pdDoc IN The PDDoc object on which to perform text extraction.
** @param startPg IN The page to start text extraction.
** @param endPg IN The page to end text extraction (inclusive).
** @param toUnicode IN Whether to extract text to Unicode encoding.
** @param pConfig IN Pointer to a WordFinder Configuration Record.
** @param pOutput IN/OUT Pointer to an output FILE stream to which the extracted
** text will be written.
** @return true to indicate text extraction operation a success, false otherwise.
*/
bool ExtractText(PDDoc pdDoc, ASInt32 startPg, ASInt32 endPg,
ASBool toUnicode, PDWordFinderConfig pConfig, FILE* pOutput)
{
if (startPg < 0 || endPg <0 || startPg > endPg || endPg > PDDocGetNumPages(pdDoc) - 1)
{
AVAlertNote("Exceeding starting or ending page number limit of current document.");
return false;
}
PDWordFinder pdWordFinder = NULL;
DURING
pdWordFinder = PDDocCreateWordFinderEx(pdDoc, WF_LATEST_VERSION, toUnicode, pConfig);
if (toUnicode) fprintf(pOutput, "%c%c", 0xfe, 0xff);
for (int i = startPg; i <= endPg; i++)
PDWordFinderEnumWords(pdWordFinder, i, ASCallbackCreateProto(PDWordProc, &WordEnumProc), pOutput);
PDWordFinderDestroy(pdWordFinder);
E_RETURN(true);
HANDLER
char buf[256], errmsg[256];
sprintf(buf, "[ExtractText()]Error %d: %s", ErrGetCode(ERRORCODE), ASGetErrorString(ERRORCODE, errmsg, sizeof(errmsg)));
AVAlertNote(buf);
if (pdWordFinder) PDWordFinderDestroy(pdWordFinder);
if( pOutput) fclose(pOutput);
return false;
END_HANDLER
return true;
}
value_t read_file_to_blob(runtime_t *runtime, string_t *filename) {
FILE *handle = fopen(filename->chars, "r");
if (handle == NULL)
return new_system_error_condition(seFileNotFound);
E_BEGIN_TRY_FINALLY();
E_RETURN(read_handle_to_blob(runtime, handle));
E_FINALLY();
fclose(handle);
E_END_TRY_FINALLY();
}
ssod_error ssod_thread_stop(ssod_iface *iface)
{
F_BEGIN();
int retval;
if (!iface) E_RETURN(SSOD_ERR_IFACE_NOT_SUPPLIED);
if (!iface->thread) ssod_thread_init(iface);
//if (iface->thread->status) RETURN(SSOD_ERR_NONE);
iface->thread->status = SSOD_THREAD_STATUS_MUST_EXIT;
RETURN(SSOD_ERR_NONE);
}
// Returns the code that implements the given method object.
static value_t compile_method(runtime_t *runtime, value_t method) {
value_t method_ast = get_method_syntax(method);
value_t fragment = get_method_module_fragment(method);
assembler_t assm;
TRY(assembler_init(&assm, runtime, fragment, scope_get_bottom()));
E_BEGIN_TRY_FINALLY();
E_TRY_DEF(code, compile_method_body(&assm, method_ast));
E_RETURN(code);
E_FINALLY();
assembler_dispose(&assm);
E_END_TRY_FINALLY();
}
fnasso_error fnasso_context_set_roaming_realm(fnasso_context *ctx, const char* roaming_realm)
{
F_BEGIN();
krb5_error_code kerberos_error;
if (!ctx) E_RETURN(FNASSO_ERR_NO_CONTEXT_SUPPLIED);
if (!roaming_realm)
{
if (ctx->roaming_realm) free(ctx->roaming_realm);
ctx->roaming_realm = NULL;
EVENT("roaming realm restored to default realm in /etc/krb5.conf");
}
else
{
if (strlen(roaming_realm))
{
ctx->roaming_realm = (char *) realloc(ctx->roaming_realm, strlen(roaming_realm) + 1);
strcpy(ctx->roaming_realm, roaming_realm);
EVENT("roaming realm is now (%s)", ctx->roaming_realm);
}
else
{
E_RETURN(FNASSO_ERR_NO_ROAMING_REALM);
}
}
if (ctx->kdc && ctx->kdc->kctx)
{
EVENT("updating current KDC default realm");
kerberos_error = krb5_set_default_realm(*ctx->kdc->kctx, ctx->roaming_realm);
if (kerberos_error)
{
fnasso_kdc_free(ctx);
E_RETURN(FNASSO_ERR_EXTERNAL, "krb5_set_default_realm", error_message(kerberos_error));
}
DEBUG("krb5_set_default_realm OK");
}
RETURN(FNASSO_ERR_NONE);
}
ssod_error ssod_thread_init(ssod_iface *iface)
{
F_BEGIN();
ssod_error error;
if (!iface) E_RETURN(SSOD_ERR_IFACE_NOT_SUPPLIED);
error = ssod_thread_free(iface);
if (error) E_THROW(error);
iface->thread = (ssod_thread*) malloc(sizeof (ssod_thread));
iface->thread->status = SSOD_THREAD_STATUS_STOPPED;
RETURN(SSOD_ERR_NONE);
}
ssod_error ssod_thread_free(ssod_iface *iface)
{
F_BEGIN();
if (!iface) E_RETURN(SSOD_ERR_IFACE_NOT_SUPPLIED);
if (iface->thread)
{
ssod_thread_stop(iface);
free(iface->thread);
iface->thread = NULL;
}
RETURN(SSOD_ERR_NONE);
}
value_t compile_method_ast_to_method(runtime_t *runtime, value_t method_ast,
value_t fragment) {
reusable_scratch_memory_t scratch;
reusable_scratch_memory_init(&scratch);
TRY_FINALLY {
E_TRY_DEF(signature, build_method_signature(runtime, fragment, &scratch,
get_method_ast_signature(method_ast)));
E_TRY_DEF(method, new_heap_method(runtime, afMutable, signature, method_ast,
nothing(), fragment, new_flag_set(kFlagSetAllOff)));
E_RETURN(method);
} FINALLY {
reusable_scratch_memory_dispose(&scratch);
} YRT
}
value_t run_code_block(safe_value_t s_ambience, safe_value_t code) {
runtime_t *runtime = get_ambience_runtime(deref(s_ambience));
CREATE_SAFE_VALUE_POOL(runtime, 4, pool);
E_BEGIN_TRY_FINALLY();
// Build a stack to run the code on.
E_S_TRY_DEF(s_stack, protect(pool, new_heap_stack(runtime, 1024)));
{
frame_t frame = open_stack(deref(s_stack));
// Set up the initial frame.
size_t frame_size = get_code_block_high_water_mark(deref(code));
E_TRY(push_stack_frame(runtime, deref(s_stack), &frame, frame_size,
ROOT(runtime, empty_array)));
frame_set_code_block(&frame, deref(code));
close_frame(&frame);
}
// Run until completion.
E_RETURN(run_stack_until_signal(s_ambience, s_stack));
E_FINALLY();
DISPOSE_SAFE_VALUE_POOL(pool);
E_END_TRY_FINALLY();
}
// Runs the given stack within the given ambience until a condition is
// encountered or evaluation completes. This function also bails on and leaves
// it to the surrounding code to report error messages.
static value_t run_stack_pushing_signals(value_t ambience, value_t stack) {
CHECK_FAMILY(ofAmbience, ambience);
CHECK_FAMILY(ofStack, stack);
runtime_t *runtime = get_ambience_runtime(ambience);
frame_t frame = open_stack(stack);
code_cache_t cache;
code_cache_refresh(&cache, &frame);
E_BEGIN_TRY_FINALLY();
while (true) {
opcode_t opcode = (opcode_t) read_short(&cache, &frame, 0);
TOPIC_INFO(Interpreter, "Opcode: %s (%i)", get_opcode_name(opcode),
opcode_counter++);
IF_EXPENSIVE_CHECKS_ENABLED(MAYBE_INTERRUPT());
switch (opcode) {
case ocPush: {
value_t value = read_value(&cache, &frame, 1);
frame_push_value(&frame, value);
frame.pc += kPushOperationSize;
break;
}
case ocPop: {
size_t count = read_short(&cache, &frame, 1);
for (size_t i = 0; i < count; i++)
frame_pop_value(&frame);
frame.pc += kPopOperationSize;
break;
}
case ocCheckStackHeight: {
size_t expected = read_short(&cache, &frame, 1);
size_t height = frame.stack_pointer - frame.frame_pointer;
CHECK_EQ("stack height", expected, height);
frame.pc += kCheckStackHeightOperationSize;
break;
}
case ocNewArray: {
size_t length = read_short(&cache, &frame, 1);
E_TRY_DEF(array, new_heap_array(runtime, length));
for (size_t i = 0; i < length; i++) {
value_t element = frame_pop_value(&frame);
set_array_at(array, length - i - 1, element);
}
frame_push_value(&frame, array);
frame.pc += kNewArrayOperationSize;
break;
}
case ocInvoke: {
// Look up the method in the method space.
value_t tags = read_value(&cache, &frame, 1);
CHECK_FAMILY(ofCallTags, tags);
value_t fragment = read_value(&cache, &frame, 2);
CHECK_FAMILY(ofModuleFragment, fragment);
value_t helper = read_value(&cache, &frame, 3);
CHECK_FAMILY(ofSignatureMap, helper);
value_t arg_map;
value_t method = lookup_method_full(ambience, fragment, tags, &frame,
helper, &arg_map);
if (in_condition_cause(ccLookupError, method)) {
log_lookup_error(method, tags, &frame);
E_RETURN(method);
}
// The lookup may have failed with a different condition. Check for that.
E_TRY(method);
E_TRY_DEF(code_block, ensure_method_code(runtime, method));
// We should now have done everything that can fail so we advance the
// pc over this instruction. In reality we haven't, the frame push op
// below can fail so we should really push the next frame before
// storing the pc for this one. Laters.
frame.pc += kInvokeOperationSize;
// Push a new activation.
E_TRY(push_stack_frame(runtime, stack, &frame,
get_code_block_high_water_mark(code_block), arg_map));
frame_set_code_block(&frame, code_block);
code_cache_refresh(&cache, &frame);
break;
}
case ocSignalContinue:
case ocSignalEscape: {
// Look up the method in the method space.
value_t tags = read_value(&cache, &frame, 1);
CHECK_FAMILY(ofCallTags, tags);
frame.pc += kSignalEscapeOperationSize;
value_t arg_map = whatever();
value_t handler = whatever();
value_t method = lookup_signal_handler_method(ambience, tags, &frame,
&handler, &arg_map);
bool is_escape = (opcode == ocSignalEscape);
if (in_condition_cause(ccLookupError, method)) {
if (is_escape) {
// There was no handler for this so we have to escape out of the
// interpreter altogether. Push the signal frame onto the stack to
// record the state of it for the enclosing code.
E_TRY(push_stack_frame(runtime, stack, &frame, 1, nothing()));
// The stack tracing code expects all frames to have a valid code block
// object. The rest makes less of a difference.
frame_set_code_block(&frame, ROOT(runtime, empty_code_block));
E_RETURN(new_signal_condition(is_escape));
} else {
// There was no handler but this is not an escape so we skip over
// the post-handler goto to the default block.
CHECK_EQ("signal not followed by goto", ocGoto,
read_short(&cache, &frame, 0));
frame.pc += kGotoOperationSize;
}
} else {
// We found a method. Invoke it.
E_TRY(method);
E_TRY_DEF(code_block, ensure_method_code(runtime, method));
E_TRY(push_stack_frame(runtime, stack, &frame,
get_code_block_high_water_mark(code_block), arg_map));
frame_set_code_block(&frame, code_block);
CHECK_TRUE("subject not null", is_null(frame_get_argument(&frame, 0)));
frame_set_argument(&frame, 0, handler);
code_cache_refresh(&cache, &frame);
}
break;
}
case ocGoto: {
size_t delta = read_short(&cache, &frame, 1);
frame.pc += delta;
break;
}
case ocDelegateToLambda:
case ocDelegateToBlock: {
// This op only appears in the lambda and block delegator methods.
// They should never be executed because the delegation happens during
// method lookup. If we hit here something's likely wrong with the
// lookup process.
UNREACHABLE("delegate to lambda");
return new_condition(ccWat);
}
case ocBuiltin: {
value_t wrapper = read_value(&cache, &frame, 1);
builtin_method_t impl = (builtin_method_t) get_void_p_value(wrapper);
builtin_arguments_t args;
builtin_arguments_init(&args, runtime, &frame);
E_TRY_DEF(result, impl(&args));
frame_push_value(&frame, result);
frame.pc += kBuiltinOperationSize;
break;
}
case ocBuiltinMaybeEscape: {
value_t wrapper = read_value(&cache, &frame, 1);
builtin_method_t impl = (builtin_method_t) get_void_p_value(wrapper);
builtin_arguments_t args;
builtin_arguments_init(&args, runtime, &frame);
value_t result = impl(&args);
if (in_condition_cause(ccSignal, result)) {
// The builtin failed. Find the appropriate signal handler and call
// it. The invocation record is at the top of the stack.
value_t tags = frame_pop_value(&frame);
CHECK_FAMILY(ofCallTags, tags);
value_t arg_map = whatever();
value_t handler = whatever();
value_t method = lookup_signal_handler_method(ambience, tags, &frame,
&handler, &arg_map);
if (in_condition_cause(ccLookupError, method)) {
// Push the record back onto the stack to it's available to back
// tracing.
frame_push_value(&frame, tags);
frame.pc += kBuiltinMaybeEscapeOperationSize;
// There was no handler for this so we have to escape out of the
// interpreter altogether. Push the signal frame onto the stack to
// record the state of it for the enclosing code.
E_TRY(push_stack_frame(runtime, stack, &frame, 1, nothing()));
// The stack tracing code expects all frames to have a valid code block
// object. The rest makes less of a difference.
frame_set_code_block(&frame, ROOT(runtime, empty_code_block));
E_RETURN(new_signal_condition(true));
}
// Either found a signal or encountered a different condition.
E_TRY(method);
// Skip forward to the point we want the signal to return to, the
// leave-or-fire-barrier op that will do the leaving.
size_t dest_offset = read_short(&cache, &frame, 2);
frame.pc += dest_offset;
// Run the handler.
E_TRY_DEF(code_block, ensure_method_code(runtime, method));
E_TRY(push_stack_frame(runtime, stack, &frame,
get_code_block_high_water_mark(code_block), arg_map));
frame_set_code_block(&frame, code_block);
CHECK_TRUE("subject not null", is_null(frame_get_argument(&frame, 0)));
frame_set_argument(&frame, 0, handler);
code_cache_refresh(&cache, &frame);
} else {
// The builtin didn't cause a condition so we can just keep going.
E_TRY(result);
frame_push_value(&frame, result);
frame.pc += kBuiltinMaybeEscapeOperationSize;
}
break;
}
case ocReturn: {
value_t result = frame_pop_value(&frame);
frame_pop_within_stack_piece(&frame);
code_cache_refresh(&cache, &frame);
frame_push_value(&frame, result);
break;
}
case ocStackBottom: {
value_t result = frame_pop_value(&frame);
validate_stack_on_normal_exit(&frame);
E_RETURN(result);
}
case ocStackPieceBottom: {
value_t top_piece = frame.stack_piece;
value_t result = frame_pop_value(&frame);
value_t next_piece = get_stack_piece_previous(top_piece);
set_stack_top_piece(stack, next_piece);
frame = open_stack(stack);
code_cache_refresh(&cache, &frame);
frame_push_value(&frame, result);
break;
}
case ocSlap: {
value_t value = frame_pop_value(&frame);
size_t argc = read_short(&cache, &frame, 1);
for (size_t i = 0; i < argc; i++)
frame_pop_value(&frame);
frame_push_value(&frame, value);
frame.pc += kSlapOperationSize;
break;
}
case ocNewReference: {
// Create the reference first so that if it fails we haven't clobbered
// the stack yet.
E_TRY_DEF(ref, new_heap_reference(runtime, nothing()));
value_t value = frame_pop_value(&frame);
set_reference_value(ref, value);
frame_push_value(&frame, ref);
frame.pc += kNewReferenceOperationSize;
break;
}
case ocSetReference: {
value_t ref = frame_pop_value(&frame);
CHECK_FAMILY(ofReference, ref);
value_t value = frame_peek_value(&frame, 0);
set_reference_value(ref, value);
frame.pc += kSetReferenceOperationSize;
break;
}
case ocGetReference: {
value_t ref = frame_pop_value(&frame);
CHECK_FAMILY(ofReference, ref);
value_t value = get_reference_value(ref);
frame_push_value(&frame, value);
frame.pc += kGetReferenceOperationSize;
break;
}
case ocLoadLocal: {
size_t index = read_short(&cache, &frame, 1);
value_t value = frame_get_local(&frame, index);
frame_push_value(&frame, value);
frame.pc += kLoadLocalOperationSize;
break;
}
case ocLoadGlobal: {
value_t ident = read_value(&cache, &frame, 1);
CHECK_FAMILY(ofIdentifier, ident);
value_t fragment = read_value(&cache, &frame, 2);
CHECK_FAMILY(ofModuleFragment, fragment);
value_t module = get_module_fragment_module(fragment);
E_TRY_DEF(value, module_lookup_identifier(runtime, module,
get_identifier_stage(ident), get_identifier_path(ident)));
frame_push_value(&frame, value);
frame.pc += kLoadGlobalOperationSize;
break;
}
case ocLoadArgument: {
size_t param_index = read_short(&cache, &frame, 1);
value_t value = frame_get_argument(&frame, param_index);
frame_push_value(&frame, value);
frame.pc += kLoadArgumentOperationSize;
break;
}
case ocLoadRefractedArgument: {
size_t param_index = read_short(&cache, &frame, 1);
size_t block_depth = read_short(&cache, &frame, 2);
value_t subject = frame_get_argument(&frame, 0);
frame_t home = frame_empty();
get_refractor_refracted_frame(subject, block_depth, &home);
value_t value = frame_get_argument(&home, param_index);
frame_push_value(&frame, value);
frame.pc += kLoadRefractedArgumentOperationSize;
break;
}
case ocLoadRefractedLocal: {
size_t index = read_short(&cache, &frame, 1);
size_t block_depth = read_short(&cache, &frame, 2);
value_t subject = frame_get_argument(&frame, 0);
frame_t home = frame_empty();
get_refractor_refracted_frame(subject, block_depth, &home);
value_t value = frame_get_local(&home, index);
frame_push_value(&frame, value);
frame.pc += kLoadRefractedLocalOperationSize;
break;
}
case ocLoadLambdaCapture: {
size_t index = read_short(&cache, &frame, 1);
value_t subject = frame_get_argument(&frame, 0);
CHECK_FAMILY(ofLambda, subject);
value_t value = get_lambda_capture(subject, index);
frame_push_value(&frame, value);
frame.pc += kLoadLambdaCaptureOperationSize;
break;
}
case ocLoadRefractedCapture: {
size_t index = read_short(&cache, &frame, 1);
size_t block_depth = read_short(&cache, &frame, 2);
value_t subject = frame_get_argument(&frame, 0);
frame_t home = frame_empty();
get_refractor_refracted_frame(subject, block_depth, &home);
value_t lambda = frame_get_argument(&home, 0);
CHECK_FAMILY(ofLambda, lambda);
value_t value = get_lambda_capture(lambda, index);
frame_push_value(&frame, value);
frame.pc += kLoadRefractedLocalOperationSize;
break;
}
case ocLambda: {
value_t space = read_value(&cache, &frame, 1);
CHECK_FAMILY(ofMethodspace, space);
size_t capture_count = read_short(&cache, &frame, 2);
value_t captures;
E_TRY_DEF(lambda, new_heap_lambda(runtime, space, nothing()));
if (capture_count == 0) {
captures = ROOT(runtime, empty_array);
frame.pc += kLambdaOperationSize;
} else {
E_TRY_SET(captures, new_heap_array(runtime, capture_count));
// The pc gets incremented here because it is after we've done all
// the allocation but before anything has been popped off the stack.
// This way all the above is idempotent, and the below is guaranteed
// to succeed.
frame.pc += kLambdaOperationSize;
for (size_t i = 0; i < capture_count; i++)
set_array_at(captures, i, frame_pop_value(&frame));
}
set_lambda_captures(lambda, captures);
frame_push_value(&frame, lambda);
break;
}
case ocCreateBlock: {
value_t space = read_value(&cache, &frame, 1);
CHECK_FAMILY(ofMethodspace, space);
// Create the block object.
E_TRY_DEF(block, new_heap_block(runtime, nothing()));
// Create the stack section that describes the block.
value_t section = frame_alloc_derived_object(&frame, get_genus_descriptor(dgBlockSection));
set_barrier_state_payload(section, block);
refraction_point_init(section, &frame);
set_block_section_methodspace(section, space);
set_block_section(block, section);
value_validate(block);
value_validate(section);
// Push the block object.
frame_push_value(&frame, block);
frame.pc += kCreateBlockOperationSize;
break;
}
case ocCreateEnsurer: {
value_t code_block = read_value(&cache, &frame, 1);
value_t section = frame_alloc_derived_object(&frame,
get_genus_descriptor(dgEnsureSection));
set_barrier_state_payload(section, code_block);
refraction_point_init(section, &frame);
value_validate(section);
frame_push_value(&frame, section);
frame.pc += kCreateEnsurerOperationSize;
break;
}
case ocCallEnsurer: {
value_t value = frame_pop_value(&frame);
value_t shard = frame_pop_value(&frame);
frame_push_value(&frame, value);
frame_push_value(&frame, shard);
CHECK_GENUS(dgEnsureSection, shard);
value_t code_block = get_barrier_state_payload(shard);
CHECK_FAMILY(ofCodeBlock, code_block);
// Unregister the barrier before calling it, otherwise if we leave
// by escaping we'll end up calling it over again.
barrier_state_unregister(shard, stack);
frame.pc += kCallEnsurerOperationSize;
value_t argmap = ROOT(runtime, array_of_zero);
push_stack_frame(runtime, stack, &frame,
get_code_block_high_water_mark(code_block), argmap);
frame_set_code_block(&frame, code_block);
code_cache_refresh(&cache, &frame);
break;
}
case ocDisposeEnsurer: {
// Discard the result of the ensure block. If an ensure blocks needs
// to return a useful value it can do it via an escape.
frame_pop_value(&frame);
value_t shard = frame_pop_value(&frame);
CHECK_GENUS(dgEnsureSection, shard);
value_t value = frame_pop_value(&frame);
frame_destroy_derived_object(&frame, get_genus_descriptor(dgEnsureSection));
frame_push_value(&frame, value);
frame.pc += kDisposeEnsurerOperationSize;
break;
}
case ocInstallSignalHandler: {
value_t space = read_value(&cache, &frame, 1);
CHECK_FAMILY(ofMethodspace, space);
size_t dest_offset = read_short(&cache, &frame, 2);
// Allocate the derived object that's going to hold the signal handler
// state.
value_t section = frame_alloc_derived_object(&frame,
get_genus_descriptor(dgSignalHandlerSection));
// Initialize the handler.
set_barrier_state_payload(section, space);
refraction_point_init(section, &frame);
// Bring the frame state to the point we'll want to escape to (modulo
// the destination offset).
frame_push_value(&frame, section);
frame.pc += kInstallSignalHandlerOperationSize;
// Finally capture the escape state.
capture_escape_state(section, &frame, dest_offset);
value_validate(section);
break;
}
case ocUninstallSignalHandler: {
// The result has been left at the top of the stack.
value_t value = frame_pop_value(&frame);
value_t section = frame_pop_value(&frame);
CHECK_GENUS(dgSignalHandlerSection, section);
barrier_state_unregister(section, stack);
frame_destroy_derived_object(&frame, get_genus_descriptor(dgSignalHandlerSection));
frame_push_value(&frame, value);
frame.pc += kUninstallSignalHandlerOperationSize;
break;
}
case ocCreateEscape: {
size_t dest_offset = read_short(&cache, &frame, 1);
// Create an initially empty escape object.
E_TRY_DEF(escape, new_heap_escape(runtime, nothing()));
// Allocate the escape section on the stack, hooking the barrier into
// the barrier chain.
value_t section = frame_alloc_derived_object(&frame, get_genus_descriptor(dgEscapeSection));
// Point the state and object to each other.
set_barrier_state_payload(section, escape);
set_escape_section(escape, section);
// Get execution ready for the next operation.
frame_push_value(&frame, escape);
frame.pc += kCreateEscapeOperationSize;
// This is the execution state the escape will escape to (modulo the
// destination offset) so this is what we want to capture.
capture_escape_state(section, &frame,
dest_offset);
break;
}
case ocLeaveOrFireBarrier: {
size_t argc = read_short(&cache, &frame, 1);
// At this point the handler has been set as the subject of the call
// to the handler method. Above the arguments are also two scratch
// stack entries.
value_t handler = frame_peek_value(&frame, argc + 2);
CHECK_GENUS(dgSignalHandlerSection, handler);
if (maybe_fire_next_barrier(&cache, &frame, runtime, stack, handler)) {
// Pop the scratch entries off.
frame_pop_value(&frame);
frame_pop_value(&frame);
// Pop the value off.
value_t value = frame_pop_value(&frame);
// Escape to the handler's home.
restore_escape_state(&frame, stack, handler);
code_cache_refresh(&cache, &frame);
// Push the value back on, now in the handler's home frame.
frame_push_value(&frame, value);
} else {
// If a barrier was fired we'll want to let the interpreter loop
// around again so just break without touching .pc.
}
break;
}
case ocFireEscapeOrBarrier: {
value_t escape = frame_get_argument(&frame, 0);
CHECK_FAMILY(ofEscape, escape);
value_t section = get_escape_section(escape);
// Fire the next barrier or, if there are no more barriers, apply the
// escape.
if (maybe_fire_next_barrier(&cache, &frame, runtime, stack, section)) {
value_t value = frame_get_argument(&frame, 2);
restore_escape_state(&frame, stack, section);
code_cache_refresh(&cache, &frame);
frame_push_value(&frame, value);
} else {
// If a barrier was fired we'll want to let the interpreter loop
// around again so just break without touching .pc.
}
break;
}
case ocDisposeEscape: {
value_t value = frame_pop_value(&frame);
value_t escape = frame_pop_value(&frame);
CHECK_FAMILY(ofEscape, escape);
value_t section = get_escape_section(escape);
value_validate(section);
barrier_state_unregister(section, stack);
on_escape_section_exit(section);
frame_destroy_derived_object(&frame, get_genus_descriptor(dgEscapeSection));
frame_push_value(&frame, value);
frame.pc += kDisposeEscapeOperationSize;
break;
}
case ocDisposeBlock: {
value_t value = frame_pop_value(&frame);
value_t block = frame_pop_value(&frame);
CHECK_FAMILY(ofBlock, block);
value_t section = get_block_section(block);
barrier_state_unregister(section, stack);
on_block_section_exit(section);
frame_destroy_derived_object(&frame, get_genus_descriptor(dgBlockSection));
frame_push_value(&frame, value);
frame.pc += kDisposeBlockOperationSize;
break;
}
default:
ERROR("Unexpected opcode %i", opcode);
UNREACHABLE("unexpected opcode");
break;
}
}
E_FINALLY();
close_frame(&frame);
E_END_TRY_FINALLY();
}