/[svn]/linuxsampler/trunk/src/scriptvm/ScriptVM.cpp
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Contents of /linuxsampler/trunk/src/scriptvm/ScriptVM.cpp

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Revision 3690 - (show annotations) (download)
Fri Jan 3 10:18:21 2020 UTC (9 months, 2 weeks ago) by schoenebeck
File size: 24352 byte(s)
NKSP: Added support for RPN and NRPN event handlers:

* NKSP language: Added support for RPN event handler
  ("on rpn ... end on" in instrument scripts).

* NKSP language: Added support for NRPN event handler
  ("on nrpn ... end on" in instrument scripts).

* Added built-in read-only variables "$RPN_ADDRESS" and "$RPN_VALUE" which
  may be read from the new RPN/NRPN script handlers to get the (N)RPN
  parameter that had been changed and its new value.

* Added built-in const variables "$NI_CB_TYPE_RPN" and "$NI_CB_TYPE_NRPN"
  which are identifying the new (N)RPN handlers as such at script runtime.

* Bumped version (2.1.1.svn30).

1 /*
2 * Copyright (c) 2014 - 2020 Christian Schoenebeck
3 *
4 * http://www.linuxsampler.org
5 *
6 * This file is part of LinuxSampler and released under the same terms.
7 * See README file for details.
8 */
9
10 #include "ScriptVM.h"
11
12 #include <string.h>
13 #include <assert.h>
14 #include "../common/global_private.h"
15 #include "tree.h"
16 #include "CoreVMFunctions.h"
17 #include "CoreVMDynVars.h"
18 #include "editor/NkspScanner.h"
19
20 #define DEBUG_SCRIPTVM_CORE 0
21
22 /**
23 * Maximum amount of VM instructions to be executed per ScriptVM::exec() call
24 * in case loops are involved, before the script got automatically suspended
25 * for a certain amount of time to avoid any RT instability issues.
26 *
27 * The following value takes a max. execution time of 300 microseconds as aimed
28 * target, assuming an execution time of approximately 5 microseconds per
29 * instruction this leads to the very approximate value set below.
30 */
31 #define SCRIPTVM_MAX_INSTR_PER_CYCLE_SOFT 70
32
33 /**
34 * Absolute maximum amount of VM instructions to be executed per
35 * ScriptVM::exec() call (even if no loops are involved), before the script got
36 * automatically suspended for a certain amount of time to avoid any RT
37 * instability issues.
38 *
39 * A distinction between "soft" and "hard" limit is done here ATM because a
40 * script author typically expects that his script might be interrupted
41 * automatically if he is using while() loops, however he might not be
42 * prepared that his script might also be interrupted if no loop is involved
43 * (i.e. on very large scripts).
44 *
45 * The following value takes a max. execution time of 1000 microseconds as
46 * aimed target, assuming an execution time of approximately 5 microseconds per
47 * instruction this leads to the very approximate value set below.
48 */
49 #define SCRIPTVM_MAX_INSTR_PER_CYCLE_HARD 210
50
51 /**
52 * In case either SCRIPTVM_MAX_INSTR_PER_CYCLE_SOFT or
53 * SCRIPTVM_MAX_INSTR_PER_CYCLE_HARD was exceeded when calling
54 * ScriptVM::exec() : the amount of microseconds the respective script
55 * execution instance should be automatically suspended by the VM.
56 */
57 #define SCRIPT_VM_FORCE_SUSPENSION_MICROSECONDS 1000
58
59 int InstrScript_parse(LinuxSampler::ParserContext*);
60
61 namespace LinuxSampler {
62
63 #if DEBUG_SCRIPTVM_CORE
64 static void _printIndents(int n) {
65 for (int i = 0; i < n; ++i) printf(" ");
66 fflush(stdout);
67 }
68 #endif
69
70 static vmint _requiredMaxStackSizeFor(Statement* statement, vmint depth = 0) {
71 if (!statement) return 1;
72
73 switch (statement->statementType()) {
74 case STMT_LEAF:
75 #if DEBUG_SCRIPTVM_CORE
76 _printIndents(depth);
77 printf("-> STMT_LEAF\n");
78 #endif
79 return 1;
80
81 case STMT_LIST: {
82 #if DEBUG_SCRIPTVM_CORE
83 _printIndents(depth);
84 printf("-> STMT_LIST\n");
85 #endif
86 Statements* stmts = (Statements*) statement;
87 vmint max = 0;
88 for (int i = 0; stmts->statement(i); ++i) {
89 vmint size = _requiredMaxStackSizeFor( stmts->statement(i), depth+1 );
90 if (max < size) max = size;
91 }
92 return max + 1;
93 }
94
95 case STMT_BRANCH: {
96 #if DEBUG_SCRIPTVM_CORE
97 _printIndents(depth);
98 printf("-> STMT_BRANCH\n");
99 #endif
100 BranchStatement* branchStmt = (BranchStatement*) statement;
101 vmint max = 0;
102 for (int i = 0; branchStmt->branch(i); ++i) {
103 vmint size = _requiredMaxStackSizeFor( branchStmt->branch(i), depth+1 );
104 if (max < size) max = size;
105 }
106 return max + 1;
107 }
108
109 case STMT_LOOP: {
110 #if DEBUG_SCRIPTVM_CORE
111 _printIndents(depth);
112 printf("-> STMT_LOOP\n");
113 #endif
114 While* whileStmt = (While*) statement;
115 if (whileStmt->statements())
116 return _requiredMaxStackSizeFor( whileStmt->statements() ) + 1;
117 else
118 return 1;
119 }
120
121 case STMT_SYNC: {
122 #if DEBUG_SCRIPTVM_CORE
123 _printIndents(depth);
124 printf("-> STMT_SYNC\n");
125 #endif
126 SyncBlock* syncStmt = (SyncBlock*) statement;
127 if (syncStmt->statements())
128 return _requiredMaxStackSizeFor( syncStmt->statements() ) + 1;
129 else
130 return 1;
131 }
132
133 case STMT_NOOP:
134 break; // no operation like the name suggests
135 }
136
137 return 1; // actually just to avoid compiler warning
138 }
139
140 static vmint _requiredMaxStackSizeFor(EventHandlers* handlers) {
141 vmint max = 1;
142 for (int i = 0; i < handlers->size(); ++i) {
143 vmint size = _requiredMaxStackSizeFor(handlers->eventHandler(i));
144 if (max < size) max = size;
145 }
146 return max;
147 }
148
149 ScriptVM::ScriptVM() :
150 m_eventHandler(NULL), m_parserContext(NULL), m_autoSuspend(true),
151 m_acceptExitRes(false)
152 {
153 m_fnMessage = new CoreVMFunction_message;
154 m_fnExit = new CoreVMFunction_exit(this);
155 m_fnWait = new CoreVMFunction_wait(this);
156 m_fnAbs = new CoreVMFunction_abs;
157 m_fnRandom = new CoreVMFunction_random;
158 m_fnNumElements = new CoreVMFunction_num_elements;
159 m_fnInc = new CoreVMFunction_inc;
160 m_fnDec = new CoreVMFunction_dec;
161 m_fnInRange = new CoreVMFunction_in_range;
162 m_varRealTimer = new CoreVMDynVar_NKSP_REAL_TIMER;
163 m_varPerfTimer = new CoreVMDynVar_NKSP_PERF_TIMER;
164 m_fnShLeft = new CoreVMFunction_sh_left;
165 m_fnShRight = new CoreVMFunction_sh_right;
166 m_fnMsb = new CoreVMFunction_msb;
167 m_fnLsb = new CoreVMFunction_lsb;
168 m_fnMin = new CoreVMFunction_min;
169 m_fnMax = new CoreVMFunction_max;
170 m_fnArrayEqual = new CoreVMFunction_array_equal;
171 m_fnSearch = new CoreVMFunction_search;
172 m_fnSort = new CoreVMFunction_sort;
173 m_fnIntToReal = new CoreVMFunction_int_to_real;
174 m_fnRealToInt = new CoreVMFunction_real_to_int;
175 m_fnRound = new CoreVMFunction_round;
176 m_fnCeil = new CoreVMFunction_ceil;
177 m_fnFloor = new CoreVMFunction_floor;
178 m_fnSqrt = new CoreVMFunction_sqrt;
179 m_fnLog = new CoreVMFunction_log;
180 m_fnLog2 = new CoreVMFunction_log2;
181 m_fnLog10 = new CoreVMFunction_log10;
182 m_fnExp = new CoreVMFunction_exp;
183 m_fnPow = new CoreVMFunction_pow;
184 m_fnSin = new CoreVMFunction_sin;
185 m_fnCos = new CoreVMFunction_cos;
186 m_fnTan = new CoreVMFunction_tan;
187 m_fnAsin = new CoreVMFunction_asin;
188 m_fnAcos = new CoreVMFunction_acos;
189 m_fnAtan = new CoreVMFunction_atan;
190 }
191
192 ScriptVM::~ScriptVM() {
193 delete m_fnMessage;
194 delete m_fnExit;
195 delete m_fnWait;
196 delete m_fnAbs;
197 delete m_fnRandom;
198 delete m_fnNumElements;
199 delete m_fnInc;
200 delete m_fnDec;
201 delete m_fnInRange;
202 delete m_fnShLeft;
203 delete m_fnShRight;
204 delete m_fnMsb;
205 delete m_fnLsb;
206 delete m_fnMin;
207 delete m_fnMax;
208 delete m_fnArrayEqual;
209 delete m_fnSearch;
210 delete m_fnSort;
211 delete m_fnIntToReal;
212 delete m_fnRealToInt;
213 delete m_fnRound;
214 delete m_fnCeil;
215 delete m_fnFloor;
216 delete m_fnSqrt;
217 delete m_fnLog;
218 delete m_fnLog2;
219 delete m_fnLog10;
220 delete m_fnExp;
221 delete m_fnPow;
222 delete m_fnSin;
223 delete m_fnCos;
224 delete m_fnTan;
225 delete m_fnAsin;
226 delete m_fnAcos;
227 delete m_fnAtan;
228 delete m_varRealTimer;
229 delete m_varPerfTimer;
230 }
231
232 VMParserContext* ScriptVM::loadScript(const String& s) {
233 std::istringstream iss(s);
234 return loadScript(&iss);
235 }
236
237 VMParserContext* ScriptVM::loadScript(std::istream* is) {
238 ParserContext* context = new ParserContext(this);
239 //printf("parserCtx=0x%lx\n", (uint64_t)context);
240
241 context->registerBuiltInConstIntVariables( builtInConstIntVariables() );
242 context->registerBuiltInConstRealVariables( builtInConstRealVariables() );
243 context->registerBuiltInIntVariables( builtInIntVariables() );
244 context->registerBuiltInIntArrayVariables( builtInIntArrayVariables() );
245 context->registerBuiltInDynVariables( builtInDynamicVariables() );
246
247 context->createScanner(is);
248
249 InstrScript_parse(context);
250 dmsg(2,("Allocating %lld bytes of global int VM memory.\n", context->globalIntVarCount * sizeof(vmint)));
251 dmsg(2,("Allocating %lld bytes of global real VM memory.\n", context->globalRealVarCount * sizeof(vmfloat)));
252 dmsg(2,("Allocating %lld bytes of global unit factor VM memory.\n", context->globalUnitFactorCount * sizeof(vmfloat)));
253 dmsg(2,("Allocating %lld of global VM string variables.\n", context->globalStrVarCount));
254 if (!context->globalIntMemory)
255 context->globalIntMemory = new ArrayList<vmint>();
256 if (!context->globalRealMemory)
257 context->globalRealMemory = new ArrayList<vmfloat>();
258 if (!context->globalUnitFactorMemory)
259 context->globalUnitFactorMemory = new ArrayList<vmfloat>();
260 if (!context->globalStrMemory)
261 context->globalStrMemory = new ArrayList<String>();
262 context->globalIntMemory->resize(context->globalIntVarCount);
263 context->globalRealMemory->resize(context->globalRealVarCount);
264 context->globalUnitFactorMemory->resize(context->globalUnitFactorCount);
265 memset(&((*context->globalIntMemory)[0]), 0, context->globalIntVarCount * sizeof(vmint));
266 memset(&((*context->globalRealMemory)[0]), 0, context->globalRealVarCount * sizeof(vmfloat));
267 for (vmint i = 0; i < context->globalUnitFactorCount; ++i)
268 (*context->globalUnitFactorMemory)[i] = VM_NO_FACTOR;
269 context->globalStrMemory->resize(context->globalStrVarCount);
270
271 context->destroyScanner();
272
273 return context;
274 }
275
276 void ScriptVM::dumpParsedScript(VMParserContext* context) {
277 ParserContext* ctx = dynamic_cast<ParserContext*>(context);
278 if (!ctx) {
279 std::cerr << "No VM context. So nothing to dump.\n";
280 return;
281 }
282 if (!ctx->handlers) {
283 std::cerr << "No event handlers defined in script. So nothing to dump.\n";
284 return;
285 }
286 if (!ctx->globalIntMemory) {
287 std::cerr << "Internal error: no global integer memory assigend to script VM.\n";
288 return;
289 }
290 if (!ctx->globalRealMemory) {
291 std::cerr << "Internal error: no global real number memory assigend to script VM.\n";
292 return;
293 }
294 ctx->handlers->dump();
295 }
296
297 VMExecContext* ScriptVM::createExecContext(VMParserContext* parserContext) {
298 ParserContext* parserCtx = dynamic_cast<ParserContext*>(parserContext);
299 ExecContext* execCtx = new ExecContext();
300
301 if (parserCtx->requiredMaxStackSize < 0) {
302 parserCtx->requiredMaxStackSize =
303 _requiredMaxStackSizeFor(&*parserCtx->handlers);
304 }
305 execCtx->stack.resize(parserCtx->requiredMaxStackSize);
306 dmsg(2,("Created VM exec context with %lld bytes VM stack size.\n",
307 parserCtx->requiredMaxStackSize * sizeof(ExecContext::StackFrame)));
308 //printf("execCtx=0x%lx\n", (uint64_t)execCtx);
309 const vmint polyIntSize = parserCtx->polyphonicIntVarCount;
310 execCtx->polyphonicIntMemory.resize(polyIntSize);
311 memset(&execCtx->polyphonicIntMemory[0], 0, polyIntSize * sizeof(vmint));
312
313 const vmint polyRealSize = parserCtx->polyphonicRealVarCount;
314 execCtx->polyphonicRealMemory.resize(polyRealSize);
315 memset(&execCtx->polyphonicRealMemory[0], 0, polyRealSize * sizeof(vmfloat));
316
317 const vmint polyFactorSize = parserCtx->polyphonicUnitFactorCount;
318 execCtx->polyphonicUnitFactorMemory.resize(polyFactorSize);
319 for (vmint i = 0; i < polyFactorSize; ++i)
320 execCtx->polyphonicUnitFactorMemory[i] = VM_NO_FACTOR;
321
322 dmsg(2,("Allocated %lld bytes polyphonic int memory.\n", polyIntSize * sizeof(vmint)));
323 dmsg(2,("Allocated %lld bytes polyphonic real memory.\n", polyRealSize * sizeof(vmfloat)));
324 dmsg(2,("Allocated %lld bytes unit factor memory.\n", polyFactorSize * sizeof(vmfloat)));
325 return execCtx;
326 }
327
328 std::vector<VMSourceToken> ScriptVM::syntaxHighlighting(const String& s) {
329 std::istringstream iss(s);
330 return syntaxHighlighting(&iss);
331 }
332
333 std::vector<VMSourceToken> ScriptVM::syntaxHighlighting(std::istream* is) {
334 try {
335 NkspScanner scanner(is);
336 std::vector<SourceToken> tokens = scanner.tokens();
337 std::vector<VMSourceToken> result;
338 result.resize(tokens.size());
339 for (vmint i = 0; i < tokens.size(); ++i) {
340 SourceToken* st = new SourceToken;
341 *st = tokens[i];
342 result[i] = VMSourceToken(st);
343 }
344 return result;
345 } catch (...) {
346 return std::vector<VMSourceToken>();
347 }
348 }
349
350 VMFunction* ScriptVM::functionByName(const String& name) {
351 if (name == "message") return m_fnMessage;
352 else if (name == "exit") return m_fnExit;
353 else if (name == "wait") return m_fnWait;
354 else if (name == "abs") return m_fnAbs;
355 else if (name == "random") return m_fnRandom;
356 else if (name == "num_elements") return m_fnNumElements;
357 else if (name == "inc") return m_fnInc;
358 else if (name == "dec") return m_fnDec;
359 else if (name == "in_range") return m_fnInRange;
360 else if (name == "sh_left") return m_fnShLeft;
361 else if (name == "sh_right") return m_fnShRight;
362 else if (name == "msb") return m_fnMsb;
363 else if (name == "lsb") return m_fnLsb;
364 else if (name == "min") return m_fnMin;
365 else if (name == "max") return m_fnMax;
366 else if (name == "array_equal") return m_fnArrayEqual;
367 else if (name == "search") return m_fnSearch;
368 else if (name == "sort") return m_fnSort;
369 else if (name == "int_to_real") return m_fnIntToReal;
370 else if (name == "real") return m_fnIntToReal;
371 else if (name == "real_to_int") return m_fnRealToInt;
372 else if (name == "int") return m_fnRealToInt;
373 else if (name == "round") return m_fnRound;
374 else if (name == "ceil") return m_fnCeil;
375 else if (name == "floor") return m_fnFloor;
376 else if (name == "sqrt") return m_fnSqrt;
377 else if (name == "log") return m_fnLog;
378 else if (name == "log2") return m_fnLog2;
379 else if (name == "log10") return m_fnLog10;
380 else if (name == "exp") return m_fnExp;
381 else if (name == "pow") return m_fnPow;
382 else if (name == "sin") return m_fnSin;
383 else if (name == "cos") return m_fnCos;
384 else if (name == "tan") return m_fnTan;
385 else if (name == "asin") return m_fnAsin;
386 else if (name == "acos") return m_fnAcos;
387 else if (name == "atan") return m_fnAtan;
388 return NULL;
389 }
390
391 bool ScriptVM::isFunctionDisabled(VMFunction* fn, VMParserContext* ctx) {
392 ParserContext* parserCtx = dynamic_cast<ParserContext*>(ctx);
393 if (!parserCtx) return false;
394
395 if (fn == m_fnMessage && parserCtx->userPreprocessorConditions.count("NKSP_NO_MESSAGE"))
396 return true;
397
398 return false;
399 }
400
401 std::map<String,VMIntPtr*> ScriptVM::builtInIntVariables() {
402 return std::map<String,VMIntPtr*>();
403 }
404
405 std::map<String,VMInt8Array*> ScriptVM::builtInIntArrayVariables() {
406 return std::map<String,VMInt8Array*>();
407 }
408
409 std::map<String,VMDynVar*> ScriptVM::builtInDynamicVariables() {
410 std::map<String,VMDynVar*> m;
411
412 m["$NKSP_PERF_TIMER"] = m_varPerfTimer;
413 m["$NKSP_REAL_TIMER"] = m_varRealTimer;
414 m["$KSP_TIMER"] = m_varRealTimer;
415
416 return m;
417 }
418
419 std::map<String,vmint> ScriptVM::builtInConstIntVariables() {
420 std::map<String,vmint> m;
421
422 m["$NI_CB_TYPE_INIT"] = VM_EVENT_HANDLER_INIT;
423 m["$NI_CB_TYPE_NOTE"] = VM_EVENT_HANDLER_NOTE;
424 m["$NI_CB_TYPE_RELEASE"] = VM_EVENT_HANDLER_RELEASE;
425 m["$NI_CB_TYPE_CONTROLLER"] = VM_EVENT_HANDLER_CONTROLLER;
426 m["$NI_CB_TYPE_RPN"] = VM_EVENT_HANDLER_RPN;
427 m["$NI_CB_TYPE_NRPN"] = VM_EVENT_HANDLER_NRPN;
428
429 return m;
430 }
431
432 std::map<String,vmfloat> ScriptVM::builtInConstRealVariables() {
433 std::map<String,vmfloat> m;
434
435 m["~NI_MATH_PI"] = M_PI;
436 m["~NI_MATH_E"] = M_E;
437
438 return m;
439 }
440
441 VMEventHandler* ScriptVM::currentVMEventHandler() {
442 return m_eventHandler;
443 }
444
445 VMParserContext* ScriptVM::currentVMParserContext() {
446 return m_parserContext;
447 }
448
449 VMExecContext* ScriptVM::currentVMExecContext() {
450 if (!m_parserContext) return NULL;
451 return m_parserContext->execContext;
452 }
453
454 void ScriptVM::setAutoSuspendEnabled(bool b) {
455 m_autoSuspend = b;
456 }
457
458 bool ScriptVM::isAutoSuspendEnabled() const {
459 return m_autoSuspend;
460 }
461
462 void ScriptVM::setExitResultEnabled(bool b) {
463 m_acceptExitRes = b;
464 }
465
466 bool ScriptVM::isExitResultEnabled() const {
467 return m_acceptExitRes;
468 }
469
470 VMExecStatus_t ScriptVM::exec(VMParserContext* parserContext, VMExecContext* execContex, VMEventHandler* handler) {
471 m_parserContext = dynamic_cast<ParserContext*>(parserContext);
472 if (!m_parserContext) {
473 std::cerr << "No VM parser context provided. Did you load a script?\n";
474 return VMExecStatus_t(VM_EXEC_NOT_RUNNING | VM_EXEC_ERROR);
475 }
476
477 // a ParserContext object is always tied to exactly one ScriptVM object
478 assert(m_parserContext->functionProvider == this);
479
480 ExecContext* ctx = dynamic_cast<ExecContext*>(execContex);
481 if (!ctx) {
482 std::cerr << "Invalid VM exec context.\n";
483 return VMExecStatus_t(VM_EXEC_NOT_RUNNING | VM_EXEC_ERROR);
484 }
485 EventHandler* h = dynamic_cast<EventHandler*>(handler);
486 if (!h) return VM_EXEC_NOT_RUNNING;
487 m_eventHandler = handler;
488
489 m_parserContext->execContext = ctx;
490
491 ctx->status = VM_EXEC_RUNNING;
492 ctx->instructionsCount = 0;
493 ctx->clearExitRes();
494 StmtFlags_t& flags = ctx->flags;
495 vmint instructionsCounter = 0;
496 vmint synced = m_autoSuspend ? 0 : 1;
497
498 int& frameIdx = ctx->stackFrame;
499 if (frameIdx < 0) { // start condition ...
500 frameIdx = -1;
501 ctx->pushStack(h);
502 }
503
504 while (flags == STMT_SUCCESS && frameIdx >= 0) {
505 if (frameIdx >= ctx->stack.size()) { // should never happen, otherwise it's a bug ...
506 std::cerr << "CRITICAL: VM stack overflow! (" << frameIdx << ")\n";
507 flags = StmtFlags_t(STMT_ABORT_SIGNALLED | STMT_ERROR_OCCURRED);
508 break;
509 }
510
511 ExecContext::StackFrame& frame = ctx->stack[frameIdx];
512 switch (frame.statement->statementType()) {
513 case STMT_LEAF: {
514 #if DEBUG_SCRIPTVM_CORE
515 _printIndents(frameIdx);
516 printf("-> STMT_LEAF\n");
517 #endif
518 LeafStatement* leaf = (LeafStatement*) frame.statement;
519 flags = leaf->exec();
520 ctx->popStack();
521 break;
522 }
523
524 case STMT_LIST: {
525 #if DEBUG_SCRIPTVM_CORE
526 _printIndents(frameIdx);
527 printf("-> STMT_LIST subidx=%d\n", frame.subindex);
528 #endif
529 Statements* stmts = (Statements*) frame.statement;
530 if (stmts->statement(frame.subindex)) {
531 ctx->pushStack(
532 stmts->statement(frame.subindex++)
533 );
534 } else {
535 #if DEBUG_SCRIPTVM_CORE
536 _printIndents(frameIdx);
537 printf("[END OF LIST] subidx=%d\n", frame.subindex);
538 #endif
539 ctx->popStack();
540 }
541 break;
542 }
543
544 case STMT_BRANCH: {
545 #if DEBUG_SCRIPTVM_CORE
546 _printIndents(frameIdx);
547 printf("-> STMT_BRANCH\n");
548 #endif
549 if (frame.subindex < 0) ctx->popStack();
550 else {
551 BranchStatement* branchStmt = (BranchStatement*) frame.statement;
552 frame.subindex =
553 (decltype(frame.subindex))
554 branchStmt->evalBranch();
555 if (frame.subindex >= 0) {
556 ctx->pushStack(
557 branchStmt->branch(frame.subindex)
558 );
559 frame.subindex = -1;
560 } else ctx->popStack();
561 }
562 break;
563 }
564
565 case STMT_LOOP: {
566 #if DEBUG_SCRIPTVM_CORE
567 _printIndents(frameIdx);
568 printf("-> STMT_LOOP\n");
569 #endif
570 While* whileStmt = (While*) frame.statement;
571 if (whileStmt->evalLoopStartCondition() && whileStmt->statements()) {
572 ctx->pushStack(
573 whileStmt->statements()
574 );
575 if (flags == STMT_SUCCESS && !synced &&
576 instructionsCounter > SCRIPTVM_MAX_INSTR_PER_CYCLE_SOFT)
577 {
578 flags = StmtFlags_t(STMT_SUSPEND_SIGNALLED);
579 ctx->suspendMicroseconds = SCRIPT_VM_FORCE_SUSPENSION_MICROSECONDS;
580 }
581 } else ctx->popStack();
582 break;
583 }
584
585 case STMT_SYNC: {
586 #if DEBUG_SCRIPTVM_CORE
587 _printIndents(frameIdx);
588 printf("-> STMT_SYNC\n");
589 #endif
590 SyncBlock* syncStmt = (SyncBlock*) frame.statement;
591 if (!frame.subindex++ && syncStmt->statements()) {
592 ++synced;
593 ctx->pushStack(
594 syncStmt->statements()
595 );
596 } else {
597 ctx->popStack();
598 --synced;
599 }
600 break;
601 }
602
603 case STMT_NOOP:
604 break; // no operation like the name suggests
605 }
606
607 if (flags == STMT_SUCCESS && !synced &&
608 instructionsCounter > SCRIPTVM_MAX_INSTR_PER_CYCLE_HARD)
609 {
610 flags = StmtFlags_t(STMT_SUSPEND_SIGNALLED);
611 ctx->suspendMicroseconds = SCRIPT_VM_FORCE_SUSPENSION_MICROSECONDS;
612 }
613
614 ++instructionsCounter;
615 }
616
617 if ((flags & STMT_SUSPEND_SIGNALLED) && !(flags & STMT_ABORT_SIGNALLED)) {
618 ctx->status = VM_EXEC_SUSPENDED;
619 ctx->flags = STMT_SUCCESS;
620 } else {
621 ctx->status = VM_EXEC_NOT_RUNNING;
622 if (flags & STMT_ERROR_OCCURRED)
623 ctx->status = VM_EXEC_ERROR;
624 ctx->reset();
625 }
626
627 ctx->instructionsCount = instructionsCounter;
628
629 m_eventHandler = NULL;
630 m_parserContext->execContext = NULL;
631 m_parserContext = NULL;
632 return ctx->status;
633 }
634
635 } // namespace LinuxSampler

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