/[svn]/linuxsampler/trunk/src/scriptvm/ScriptVM.cpp
ViewVC logotype

Diff of /linuxsampler/trunk/src/scriptvm/ScriptVM.cpp

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 2948 by schoenebeck, Fri Jul 15 15:29:04 2016 UTC revision 3076 by schoenebeck, Thu Jan 5 18:00:52 2017 UTC
# Line 1  Line 1 
1  /*  /*
2   * Copyright (c) 2014 - 2016 Christian Schoenebeck   * Copyright (c) 2014 - 2017 Christian Schoenebeck
3   *   *
4   * http://www.linuxsampler.org   * http://www.linuxsampler.org
5   *   *
# 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 {
62    
63        #if DEBUG_SCRIPTVM_CORE
64      static void _printIndents(int n) {      static void _printIndents(int n) {
65          for (int i = 0; i < n; ++i) printf("  ");          for (int i = 0; i < n; ++i) printf("  ");
66          fflush(stdout);          fflush(stdout);
67      }      }
68        #endif
69    
70      static int _requiredMaxStackSizeFor(Statement* statement, int depth = 0) {      static int _requiredMaxStackSizeFor(Statement* statement, int depth = 0) {
71          if (!statement) return 1;          if (!statement) return 1;
# Line 92  namespace LinuxSampler { Line 131  namespace LinuxSampler {
131          return max;          return max;
132      }      }
133    
134      ScriptVM::ScriptVM() : m_eventHandler(NULL), m_parserContext(NULL) {      ScriptVM::ScriptVM() : m_eventHandler(NULL), m_parserContext(NULL), m_autoSuspend(true) {
135          m_fnMessage = new CoreVMFunction_message;          m_fnMessage = new CoreVMFunction_message;
136          m_fnExit = new CoreVMFunction_exit;          m_fnExit = new CoreVMFunction_exit;
137          m_fnWait = new CoreVMFunction_wait(this);          m_fnWait = new CoreVMFunction_wait(this);
# Line 101  namespace LinuxSampler { Line 140  namespace LinuxSampler {
140          m_fnNumElements = new CoreVMFunction_num_elements;          m_fnNumElements = new CoreVMFunction_num_elements;
141          m_fnInc = new CoreVMFunction_inc;          m_fnInc = new CoreVMFunction_inc;
142          m_fnDec = new CoreVMFunction_dec;          m_fnDec = new CoreVMFunction_dec;
143            m_fnInRange = new CoreVMFunction_in_range;
144          m_varRealTimer = new CoreVMDynVar_NKSP_REAL_TIMER;          m_varRealTimer = new CoreVMDynVar_NKSP_REAL_TIMER;
145          m_varPerfTimer = new CoreVMDynVar_NKSP_PERF_TIMER;          m_varPerfTimer = new CoreVMDynVar_NKSP_PERF_TIMER;
146            m_fnShLeft = new CoreVMFunction_sh_left;
147            m_fnShRight = new CoreVMFunction_sh_right;
148            m_fnMin = new CoreVMFunction_min;
149            m_fnMax = new CoreVMFunction_max;
150      }      }
151    
152      ScriptVM::~ScriptVM() {      ScriptVM::~ScriptVM() {
# Line 114  namespace LinuxSampler { Line 158  namespace LinuxSampler {
158          delete m_fnNumElements;          delete m_fnNumElements;
159          delete m_fnInc;          delete m_fnInc;
160          delete m_fnDec;          delete m_fnDec;
161            delete m_fnInRange;
162            delete m_fnShLeft;
163            delete m_fnShRight;
164            delete m_fnMin;
165            delete m_fnMax;
166          delete m_varRealTimer;          delete m_varRealTimer;
167          delete m_varPerfTimer;          delete m_varPerfTimer;
168      }      }
# Line 215  namespace LinuxSampler { Line 264  namespace LinuxSampler {
264          else if (name == "num_elements") return m_fnNumElements;          else if (name == "num_elements") return m_fnNumElements;
265          else if (name == "inc") return m_fnInc;          else if (name == "inc") return m_fnInc;
266          else if (name == "dec") return m_fnDec;          else if (name == "dec") return m_fnDec;
267            else if (name == "in_range") return m_fnInRange;
268            else if (name == "sh_left") return m_fnShLeft;
269            else if (name == "sh_right") return m_fnShRight;
270            else if (name == "min") return m_fnMin;
271            else if (name == "max") return m_fnMax;
272          return NULL;          return NULL;
273      }      }
274    
# Line 260  namespace LinuxSampler { Line 314  namespace LinuxSampler {
314          return m_parserContext->execContext;          return m_parserContext->execContext;
315      }      }
316    
317        void ScriptVM::setAutoSuspendEnabled(bool b) {
318            m_autoSuspend = b;
319        }
320    
321        bool ScriptVM::isAutoSuspendEnabled() const {
322            return m_autoSuspend;
323        }
324    
325      VMExecStatus_t ScriptVM::exec(VMParserContext* parserContext, VMExecContext* execContex, VMEventHandler* handler) {      VMExecStatus_t ScriptVM::exec(VMParserContext* parserContext, VMExecContext* execContex, VMEventHandler* handler) {
326          m_parserContext = dynamic_cast<ParserContext*>(parserContext);          m_parserContext = dynamic_cast<ParserContext*>(parserContext);
327          if (!m_parserContext) {          if (!m_parserContext) {
# Line 283  namespace LinuxSampler { Line 345  namespace LinuxSampler {
345    
346          ctx->status = VM_EXEC_RUNNING;          ctx->status = VM_EXEC_RUNNING;
347          StmtFlags_t flags = STMT_SUCCESS;          StmtFlags_t flags = STMT_SUCCESS;
348            int instructionsCounter = 0;
349    
350          int& frameIdx = ctx->stackFrame;          int& frameIdx = ctx->stackFrame;
351          if (frameIdx < 0) { // start condition ...          if (frameIdx < 0) { // start condition ...
# Line 359  namespace LinuxSampler { Line 422  namespace LinuxSampler {
422                          ctx->pushStack(                          ctx->pushStack(
423                              whileStmt->statements()                              whileStmt->statements()
424                          );                          );
425                            if (flags == STMT_SUCCESS && m_autoSuspend &&
426                                instructionsCounter > SCRIPTVM_MAX_INSTR_PER_CYCLE_SOFT)
427                            {
428                                flags = StmtFlags_t(STMT_SUSPEND_SIGNALLED);
429                                ctx->suspendMicroseconds = SCRIPT_VM_FORCE_SUSPENSION_MICROSECONDS;
430                            }
431                      } else ctx->popStack();                      } else ctx->popStack();
432                        break;
433                  }                  }
434              }              }
435    
436                if (flags == STMT_SUCCESS && m_autoSuspend &&
437                    instructionsCounter > SCRIPTVM_MAX_INSTR_PER_CYCLE_HARD)
438                {
439                    flags = StmtFlags_t(STMT_SUSPEND_SIGNALLED);
440                    ctx->suspendMicroseconds = SCRIPT_VM_FORCE_SUSPENSION_MICROSECONDS;
441                }
442    
443                ++instructionsCounter;
444          }          }
445    
446          if (flags & STMT_SUSPEND_SIGNALLED) {          if (flags & STMT_SUSPEND_SIGNALLED) {
Legend:
Removed from v.2948  
changed lines
  Added in v.3076
  ViewVC Help
Powered by ViewVC