/[svn]/linuxsampler/trunk/src/scriptvm/ScriptVM.cpp
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revision 2970 by schoenebeck, Thu Jul 21 16:22:55 2016 UTC revision 2974 by schoenebeck, Fri Jul 22 15:51:40 2016 UTC
# Line 19  Line 19 
19    
20  #define DEBUG_SCRIPTVM_CORE 0  #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*);  int InstrScript_parse(LinuxSampler::ParserContext*);
60    
61  namespace LinuxSampler {  namespace LinuxSampler {
# Line 92  namespace LinuxSampler { Line 129  namespace LinuxSampler {
129          return max;          return max;
130      }      }
131    
132      ScriptVM::ScriptVM() : m_eventHandler(NULL), m_parserContext(NULL) {      ScriptVM::ScriptVM() : m_eventHandler(NULL), m_parserContext(NULL), m_autoSuspend(true) {
133          m_fnMessage = new CoreVMFunction_message;          m_fnMessage = new CoreVMFunction_message;
134          m_fnExit = new CoreVMFunction_exit;          m_fnExit = new CoreVMFunction_exit;
135          m_fnWait = new CoreVMFunction_wait(this);          m_fnWait = new CoreVMFunction_wait(this);
# Line 272  namespace LinuxSampler { Line 309  namespace LinuxSampler {
309          return m_parserContext->execContext;          return m_parserContext->execContext;
310      }      }
311    
312        void ScriptVM::setAutoSuspendEnabled(bool b) {
313            m_autoSuspend = b;
314        }
315    
316        bool ScriptVM::isAutoSuspendEnabled() const {
317            return m_autoSuspend;
318        }
319    
320      VMExecStatus_t ScriptVM::exec(VMParserContext* parserContext, VMExecContext* execContex, VMEventHandler* handler) {      VMExecStatus_t ScriptVM::exec(VMParserContext* parserContext, VMExecContext* execContex, VMEventHandler* handler) {
321          m_parserContext = dynamic_cast<ParserContext*>(parserContext);          m_parserContext = dynamic_cast<ParserContext*>(parserContext);
322          if (!m_parserContext) {          if (!m_parserContext) {
# Line 295  namespace LinuxSampler { Line 340  namespace LinuxSampler {
340    
341          ctx->status = VM_EXEC_RUNNING;          ctx->status = VM_EXEC_RUNNING;
342          StmtFlags_t flags = STMT_SUCCESS;          StmtFlags_t flags = STMT_SUCCESS;
343            int instructionsCounter = 0;
344    
345          int& frameIdx = ctx->stackFrame;          int& frameIdx = ctx->stackFrame;
346          if (frameIdx < 0) { // start condition ...          if (frameIdx < 0) { // start condition ...
# Line 371  namespace LinuxSampler { Line 417  namespace LinuxSampler {
417                          ctx->pushStack(                          ctx->pushStack(
418                              whileStmt->statements()                              whileStmt->statements()
419                          );                          );
420                            if (flags == STMT_SUCCESS && m_autoSuspend &&
421                                instructionsCounter > SCRIPTVM_MAX_INSTR_PER_CYCLE_SOFT)
422                            {
423                                flags = StmtFlags_t(STMT_SUSPEND_SIGNALLED);
424                                ctx->suspendMicroseconds = SCRIPT_VM_FORCE_SUSPENSION_MICROSECONDS;
425                            }
426                      } else ctx->popStack();                      } else ctx->popStack();
427                        break;
428                  }                  }
429              }              }
430    
431                if (flags == STMT_SUCCESS && m_autoSuspend &&
432                    instructionsCounter > SCRIPTVM_MAX_INSTR_PER_CYCLE_HARD)
433                {
434                    flags = StmtFlags_t(STMT_SUSPEND_SIGNALLED);
435                    ctx->suspendMicroseconds = SCRIPT_VM_FORCE_SUSPENSION_MICROSECONDS;
436                }
437    
438                ++instructionsCounter;
439          }          }
440    
441          if (flags & STMT_SUSPEND_SIGNALLED) {          if (flags & STMT_SUSPEND_SIGNALLED) {
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