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

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Revision 3581 - (show annotations) (download)
Fri Aug 30 11:40:25 2019 UTC (4 years, 7 months ago) by schoenebeck
File size: 21967 byte(s) 
NKSP: Allow more wider support of standard measuring units & 'final'ness.

* Raised compiler requirement to be C++14 compliant (due to severe
  restrictions regarding C-style aggregate initializer lists in C++11
  which are now massively used throughout the code base).

* NKSP VM API: Allow units and 'final'ness to be returned as result from
  built-in functions (added methods VMFunction::returnUnitType() and
  VMFunction::returnsFinal() for that purpose which must be implemented by
  built-in function implementations).

* NKSP language: Allow metric unit prefixes of numeric scalar and array
  variables to be changed freely at runtime (unlike unit types like Hz etc.
  which are still sticky parse-time features of variables which cannot be
  changed at runtime for the intentional sake of determinism).

* NKSP language: 'final' values are prohibited for array variables for now
  (attempt causes a parsers error).

* NKSP language: expressions with unit types (e.g. Hz) are prohibited for
  conditions of runtime control structures like if(), while(), select()
  (attempt causes a parser error).

* NKSP VM API: Allow built-in functions to perform their own, individual
  parse time checks of arguments going to be passed to the function at
  runtime (added method VMFunction::checkArgs() for that purpose).

* NKSP language: raise parser warning if only one operand of binary
  operators (like logical 'or' comparison) contain a 'final' value (because
  it would always yield in a 'final' result in such cases).

* NKSP language: Allow comparison (=, #, <, >, <=, >=) of values with
  different metric unit prefixes, which will behave as expected (e.g.
  result of expression '1000us < 2ms' is true).

* NKSP language: Allow adding values with different metric unit prefixes
  (e.g. result of expression '100Hz + 5kHz' is '5100Hz').

* NKSP language: Allow subtracting values with different metric unit
  prefixes (e.g. result of expression '1ms - 20us' is '980us').

* NKSP language: Allow multiplying with any metric unit prefixes
  (e.g. result of expression '2k * 3ms' is '6s'), however multiplications
  with unit types on both sides (e.g. '2s * 2s') is still prohibited since
  we don't have any considerable practical use for a term like '4s^2'
  (hence any attempt multiplying two unit types still causes parser error).

* NKSP language: Allow dividing by any metric unit prefixes and allow
  division of same unit type on both sides (e.g. expression '8kHz / 1000Hz'
  yields in unit free result '8'). So this is now a way to cast units away
  e.g. for passing the result to other expressions, certain function calls
  or variables which are not accepting any units (or that specific unit).

* NKSP language: integer arrays and real number arrays can now be converted
  to strings (e.g. for dumping their content with message() calls for
  script debugging purposes).

* NKSP language: expressions and variables with units are now correctly
  casted to strings (e.g. with message() calls).

* NKSP language: comparing real numbers for equalness (e.g. '~foo = 3.1') or
  unequalness (e.g. '~foo # 3.1') is now less strict and takes the expected
  floating point tolerances into account.

* NKSP VM API: Added methods VMScalarNumberExpr::evalCastInt() and
  VMScalarNumberExpr::evalCastReal().

* NKSP VM API: Added base class 'VMNumberArrayExpr' for classes
  'VMIntArrayExpr' and 'VMRealArrayExpr'.

* NKSP VM API: replaced all unitPrefix() (parse time) methods by
  unitFactor() (runtime) methods.

* Built-in function "exit()" supports now returning units and 'final'ness
  exclusively for test cases.

* The following built-in functions support now units as well: "abs()",
  "random()", "inc()", "dec()", "in_range()", "min()", "max()",
  "real_to_int()", "int()", "int_to_real()" and "real()".

* Built-in functions "array_equal()", "search()" and "sort()" support now
  real number arrays (correctly) as well.

* Added individual parse time checks of arguments to be passed to built-in
  functions "random()", "inc()", "dec()", "in_range()", "min()", "max()",
  "array_equal()" and "search()" specific for their individual purposes.

* Test cases: Added massive amount of NKSP test cases for standard
  measuring units and 'final' operator usage cases.

* Test cases: Added NKSP test cases for (floating point tolerance aware)
  real number equalness / unequalness comparison.

* Bumped version (2.1.1.svn8).
1 /*
2 * Copyright (c) 2014 - 2019 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_fnMin = new CoreVMFunction_min;
167 m_fnMax = new CoreVMFunction_max;
168 m_fnArrayEqual = new CoreVMFunction_array_equal;
169 m_fnSearch = new CoreVMFunction_search;
170 m_fnSort = new CoreVMFunction_sort;
171 m_fnIntToReal = new CoreVMFunction_int_to_real;
172 m_fnRealToInt = new CoreVMFunction_real_to_int;
173 }
174
175 ScriptVM::~ScriptVM() {
176 delete m_fnMessage;
177 delete m_fnExit;
178 delete m_fnWait;
179 delete m_fnAbs;
180 delete m_fnRandom;
181 delete m_fnNumElements;
182 delete m_fnInc;
183 delete m_fnDec;
184 delete m_fnInRange;
185 delete m_fnShLeft;
186 delete m_fnShRight;
187 delete m_fnMin;
188 delete m_fnMax;
189 delete m_fnArrayEqual;
190 delete m_fnSearch;
191 delete m_fnSort;
192 delete m_fnIntToReal;
193 delete m_fnRealToInt;
194 delete m_varRealTimer;
195 delete m_varPerfTimer;
196 }
197
198 VMParserContext* ScriptVM::loadScript(const String& s) {
199 std::istringstream iss(s);
200 return loadScript(&iss);
201 }
202
203 VMParserContext* ScriptVM::loadScript(std::istream* is) {
204 ParserContext* context = new ParserContext(this);
205 //printf("parserCtx=0x%lx\n", (uint64_t)context);
206
207 context->registerBuiltInConstIntVariables( builtInConstIntVariables() );
208 context->registerBuiltInIntVariables( builtInIntVariables() );
209 context->registerBuiltInIntArrayVariables( builtInIntArrayVariables() );
210 context->registerBuiltInDynVariables( builtInDynamicVariables() );
211
212 context->createScanner(is);
213
214 InstrScript_parse(context);
215 dmsg(2,("Allocating %lld bytes of global int VM memory.\n", context->globalIntVarCount * sizeof(vmint)));
216 dmsg(2,("Allocating %lld bytes of global real VM memory.\n", context->globalRealVarCount * sizeof(vmfloat)));
217 dmsg(2,("Allocating %lld bytes of global unit factor VM memory.\n", context->globalUnitFactorCount * sizeof(vmfloat)));
218 dmsg(2,("Allocating %lld of global VM string variables.\n", context->globalStrVarCount));
219 if (!context->globalIntMemory)
220 context->globalIntMemory = new ArrayList<vmint>();
221 if (!context->globalRealMemory)
222 context->globalRealMemory = new ArrayList<vmfloat>();
223 if (!context->globalUnitFactorMemory)
224 context->globalUnitFactorMemory = new ArrayList<vmfloat>();
225 if (!context->globalStrMemory)
226 context->globalStrMemory = new ArrayList<String>();
227 context->globalIntMemory->resize(context->globalIntVarCount);
228 context->globalRealMemory->resize(context->globalRealVarCount);
229 context->globalUnitFactorMemory->resize(context->globalUnitFactorCount);
230 memset(&((*context->globalIntMemory)[0]), 0, context->globalIntVarCount * sizeof(vmint));
231 memset(&((*context->globalRealMemory)[0]), 0, context->globalRealVarCount * sizeof(vmfloat));
232 for (vmint i = 0; i < context->globalUnitFactorCount; ++i)
233 (*context->globalUnitFactorMemory)[i] = VM_NO_FACTOR;
234 context->globalStrMemory->resize(context->globalStrVarCount);
235
236 context->destroyScanner();
237
238 return context;
239 }
240
241 void ScriptVM::dumpParsedScript(VMParserContext* context) {
242 ParserContext* ctx = dynamic_cast<ParserContext*>(context);
243 if (!ctx) {
244 std::cerr << "No VM context. So nothing to dump.\n";
245 return;
246 }
247 if (!ctx->handlers) {
248 std::cerr << "No event handlers defined in script. So nothing to dump.\n";
249 return;
250 }
251 if (!ctx->globalIntMemory) {
252 std::cerr << "Internal error: no global integer memory assigend to script VM.\n";
253 return;
254 }
255 if (!ctx->globalRealMemory) {
256 std::cerr << "Internal error: no global real number memory assigend to script VM.\n";
257 return;
258 }
259 ctx->handlers->dump();
260 }
261
262 VMExecContext* ScriptVM::createExecContext(VMParserContext* parserContext) {
263 ParserContext* parserCtx = dynamic_cast<ParserContext*>(parserContext);
264 ExecContext* execCtx = new ExecContext();
265
266 if (parserCtx->requiredMaxStackSize < 0) {
267 parserCtx->requiredMaxStackSize =
268 _requiredMaxStackSizeFor(&*parserCtx->handlers);
269 }
270 execCtx->stack.resize(parserCtx->requiredMaxStackSize);
271 dmsg(2,("Created VM exec context with %lld bytes VM stack size.\n",
272 parserCtx->requiredMaxStackSize * sizeof(ExecContext::StackFrame)));
273 //printf("execCtx=0x%lx\n", (uint64_t)execCtx);
274 const vmint polyIntSize = parserCtx->polyphonicIntVarCount;
275 execCtx->polyphonicIntMemory.resize(polyIntSize);
276 memset(&execCtx->polyphonicIntMemory[0], 0, polyIntSize * sizeof(vmint));
277
278 const vmint polyRealSize = parserCtx->polyphonicRealVarCount;
279 execCtx->polyphonicRealMemory.resize(polyRealSize);
280 memset(&execCtx->polyphonicRealMemory[0], 0, polyRealSize * sizeof(vmfloat));
281
282 const vmint polyFactorSize = parserCtx->polyphonicUnitFactorCount;
283 execCtx->polyphonicUnitFactorMemory.resize(polyFactorSize);
284 for (vmint i = 0; i < polyFactorSize; ++i)
285 execCtx->polyphonicUnitFactorMemory[i] = VM_NO_FACTOR;
286
287 dmsg(2,("Allocated %lld bytes polyphonic int memory.\n", polyIntSize * sizeof(vmint)));
288 dmsg(2,("Allocated %lld bytes polyphonic real memory.\n", polyRealSize * sizeof(vmfloat)));
289 dmsg(2,("Allocated %lld bytes unit factor memory.\n", polyFactorSize * sizeof(vmfloat)));
290 return execCtx;
291 }
292
293 std::vector<VMSourceToken> ScriptVM::syntaxHighlighting(const String& s) {
294 std::istringstream iss(s);
295 return syntaxHighlighting(&iss);
296 }
297
298 std::vector<VMSourceToken> ScriptVM::syntaxHighlighting(std::istream* is) {
299 try {
300 NkspScanner scanner(is);
301 std::vector<SourceToken> tokens = scanner.tokens();
302 std::vector<VMSourceToken> result;
303 result.resize(tokens.size());
304 for (vmint i = 0; i < tokens.size(); ++i) {
305 SourceToken* st = new SourceToken;
306 *st = tokens[i];
307 result[i] = VMSourceToken(st);
308 }
309 return result;
310 } catch (...) {
311 return std::vector<VMSourceToken>();
312 }
313 }
314
315 VMFunction* ScriptVM::functionByName(const String& name) {
316 if (name == "message") return m_fnMessage;
317 else if (name == "exit") return m_fnExit;
318 else if (name == "wait") return m_fnWait;
319 else if (name == "abs") return m_fnAbs;
320 else if (name == "random") return m_fnRandom;
321 else if (name == "num_elements") return m_fnNumElements;
322 else if (name == "inc") return m_fnInc;
323 else if (name == "dec") return m_fnDec;
324 else if (name == "in_range") return m_fnInRange;
325 else if (name == "sh_left") return m_fnShLeft;
326 else if (name == "sh_right") return m_fnShRight;
327 else if (name == "min") return m_fnMin;
328 else if (name == "max") return m_fnMax;
329 else if (name == "array_equal") return m_fnArrayEqual;
330 else if (name == "search") return m_fnSearch;
331 else if (name == "sort") return m_fnSort;
332 else if (name == "int_to_real") return m_fnIntToReal;
333 else if (name == "real") return m_fnIntToReal;
334 else if (name == "real_to_int") return m_fnRealToInt;
335 else if (name == "int") return m_fnRealToInt;
336 return NULL;
337 }
338
339 bool ScriptVM::isFunctionDisabled(VMFunction* fn, VMParserContext* ctx) {
340 ParserContext* parserCtx = dynamic_cast<ParserContext*>(ctx);
341 if (!parserCtx) return false;
342
343 if (fn == m_fnMessage && parserCtx->userPreprocessorConditions.count("NKSP_NO_MESSAGE"))
344 return true;
345
346 return false;
347 }
348
349 std::map<String,VMIntPtr*> ScriptVM::builtInIntVariables() {
350 return std::map<String,VMIntPtr*>();
351 }
352
353 std::map<String,VMInt8Array*> ScriptVM::builtInIntArrayVariables() {
354 return std::map<String,VMInt8Array*>();
355 }
356
357 std::map<String,VMDynVar*> ScriptVM::builtInDynamicVariables() {
358 std::map<String,VMDynVar*> m;
359
360 m["$NKSP_PERF_TIMER"] = m_varPerfTimer;
361 m["$NKSP_REAL_TIMER"] = m_varRealTimer;
362 m["$KSP_TIMER"] = m_varRealTimer;
363
364 return m;
365 }
366
367 std::map<String,vmint> ScriptVM::builtInConstIntVariables() {
368 std::map<String,vmint> m;
369
370 m["$NI_CB_TYPE_INIT"] = VM_EVENT_HANDLER_INIT;
371 m["$NI_CB_TYPE_NOTE"] = VM_EVENT_HANDLER_NOTE;
372 m["$NI_CB_TYPE_RELEASE"] = VM_EVENT_HANDLER_RELEASE;
373 m["$NI_CB_TYPE_CONTROLLER"] = VM_EVENT_HANDLER_CONTROLLER;
374
375 return m;
376 }
377
378 VMEventHandler* ScriptVM::currentVMEventHandler() {
379 return m_eventHandler;
380 }
381
382 VMParserContext* ScriptVM::currentVMParserContext() {
383 return m_parserContext;
384 }
385
386 VMExecContext* ScriptVM::currentVMExecContext() {
387 if (!m_parserContext) return NULL;
388 return m_parserContext->execContext;
389 }
390
391 void ScriptVM::setAutoSuspendEnabled(bool b) {
392 m_autoSuspend = b;
393 }
394
395 bool ScriptVM::isAutoSuspendEnabled() const {
396 return m_autoSuspend;
397 }
398
399 void ScriptVM::setExitResultEnabled(bool b) {
400 m_acceptExitRes = b;
401 }
402
403 bool ScriptVM::isExitResultEnabled() const {
404 return m_acceptExitRes;
405 }
406
407 VMExecStatus_t ScriptVM::exec(VMParserContext* parserContext, VMExecContext* execContex, VMEventHandler* handler) {
408 m_parserContext = dynamic_cast<ParserContext*>(parserContext);
409 if (!m_parserContext) {
410 std::cerr << "No VM parser context provided. Did you load a script?\n";
411 return VMExecStatus_t(VM_EXEC_NOT_RUNNING | VM_EXEC_ERROR);
412 }
413
414 // a ParserContext object is always tied to exactly one ScriptVM object
415 assert(m_parserContext->functionProvider == this);
416
417 ExecContext* ctx = dynamic_cast<ExecContext*>(execContex);
418 if (!ctx) {
419 std::cerr << "Invalid VM exec context.\n";
420 return VMExecStatus_t(VM_EXEC_NOT_RUNNING | VM_EXEC_ERROR);
421 }
422 EventHandler* h = dynamic_cast<EventHandler*>(handler);
423 if (!h) return VM_EXEC_NOT_RUNNING;
424 m_eventHandler = handler;
425
426 m_parserContext->execContext = ctx;
427
428 ctx->status = VM_EXEC_RUNNING;
429 ctx->instructionsCount = 0;
430 ctx->clearExitRes();
431 StmtFlags_t& flags = ctx->flags;
432 vmint instructionsCounter = 0;
433 vmint synced = m_autoSuspend ? 0 : 1;
434
435 int& frameIdx = ctx->stackFrame;
436 if (frameIdx < 0) { // start condition ...
437 frameIdx = -1;
438 ctx->pushStack(h);
439 }
440
441 while (flags == STMT_SUCCESS && frameIdx >= 0) {
442 if (frameIdx >= ctx->stack.size()) { // should never happen, otherwise it's a bug ...
443 std::cerr << "CRITICAL: VM stack overflow! (" << frameIdx << ")\n";
444 flags = StmtFlags_t(STMT_ABORT_SIGNALLED | STMT_ERROR_OCCURRED);
445 break;
446 }
447
448 ExecContext::StackFrame& frame = ctx->stack[frameIdx];
449 switch (frame.statement->statementType()) {
450 case STMT_LEAF: {
451 #if DEBUG_SCRIPTVM_CORE
452 _printIndents(frameIdx);
453 printf("-> STMT_LEAF\n");
454 #endif
455 LeafStatement* leaf = (LeafStatement*) frame.statement;
456 flags = leaf->exec();
457 ctx->popStack();
458 break;
459 }
460
461 case STMT_LIST: {
462 #if DEBUG_SCRIPTVM_CORE
463 _printIndents(frameIdx);
464 printf("-> STMT_LIST subidx=%d\n", frame.subindex);
465 #endif
466 Statements* stmts = (Statements*) frame.statement;
467 if (stmts->statement(frame.subindex)) {
468 ctx->pushStack(
469 stmts->statement(frame.subindex++)
470 );
471 } else {
472 #if DEBUG_SCRIPTVM_CORE
473 _printIndents(frameIdx);
474 printf("[END OF LIST] subidx=%d\n", frame.subindex);
475 #endif
476 ctx->popStack();
477 }
478 break;
479 }
480
481 case STMT_BRANCH: {
482 #if DEBUG_SCRIPTVM_CORE
483 _printIndents(frameIdx);
484 printf("-> STMT_BRANCH\n");
485 #endif
486 if (frame.subindex < 0) ctx->popStack();
487 else {
488 BranchStatement* branchStmt = (BranchStatement*) frame.statement;
489 frame.subindex =
490 (decltype(frame.subindex))
491 branchStmt->evalBranch();
492 if (frame.subindex >= 0) {
493 ctx->pushStack(
494 branchStmt->branch(frame.subindex)
495 );
496 frame.subindex = -1;
497 } else ctx->popStack();
498 }
499 break;
500 }
501
502 case STMT_LOOP: {
503 #if DEBUG_SCRIPTVM_CORE
504 _printIndents(frameIdx);
505 printf("-> STMT_LOOP\n");
506 #endif
507 While* whileStmt = (While*) frame.statement;
508 if (whileStmt->evalLoopStartCondition() && whileStmt->statements()) {
509 ctx->pushStack(
510 whileStmt->statements()
511 );
512 if (flags == STMT_SUCCESS && !synced &&
513 instructionsCounter > SCRIPTVM_MAX_INSTR_PER_CYCLE_SOFT)
514 {
515 flags = StmtFlags_t(STMT_SUSPEND_SIGNALLED);
516 ctx->suspendMicroseconds = SCRIPT_VM_FORCE_SUSPENSION_MICROSECONDS;
517 }
518 } else ctx->popStack();
519 break;
520 }
521
522 case STMT_SYNC: {
523 #if DEBUG_SCRIPTVM_CORE
524 _printIndents(frameIdx);
525 printf("-> STMT_SYNC\n");
526 #endif
527 SyncBlock* syncStmt = (SyncBlock*) frame.statement;
528 if (!frame.subindex++ && syncStmt->statements()) {
529 ++synced;
530 ctx->pushStack(
531 syncStmt->statements()
532 );
533 } else {
534 ctx->popStack();
535 --synced;
536 }
537 break;
538 }
539
540 case STMT_NOOP:
541 break; // no operation like the name suggests
542 }
543
544 if (flags == STMT_SUCCESS && !synced &&
545 instructionsCounter > SCRIPTVM_MAX_INSTR_PER_CYCLE_HARD)
546 {
547 flags = StmtFlags_t(STMT_SUSPEND_SIGNALLED);
548 ctx->suspendMicroseconds = SCRIPT_VM_FORCE_SUSPENSION_MICROSECONDS;
549 }
550
551 ++instructionsCounter;
552 }
553
554 if ((flags & STMT_SUSPEND_SIGNALLED) && !(flags & STMT_ABORT_SIGNALLED)) {
555 ctx->status = VM_EXEC_SUSPENDED;
556 ctx->flags = STMT_SUCCESS;
557 } else {
558 ctx->status = VM_EXEC_NOT_RUNNING;
559 if (flags & STMT_ERROR_OCCURRED)
560 ctx->status = VM_EXEC_ERROR;
561 ctx->reset();
562 }
563
564 ctx->instructionsCount = instructionsCounter;
565
566 m_eventHandler = NULL;
567 m_parserContext->execContext = NULL;
568 m_parserContext = NULL;
569 return ctx->status;
570 }
571
572 } // namespace LinuxSampler
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