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/* |
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* Copyright (c) 2014 - 2017 Christian Schoenebeck |
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* |
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* http://www.linuxsampler.org |
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* |
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* This file is part of LinuxSampler and released under the same terms. |
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* See README file for details. |
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*/ |
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#include "ScriptVM.h" |
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#include <string.h> |
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#include <assert.h> |
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#include "../common/global_private.h" |
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#include "tree.h" |
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#include "CoreVMFunctions.h" |
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#include "CoreVMDynVars.h" |
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#include "editor/NkspScanner.h" |
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#define DEBUG_SCRIPTVM_CORE 0 |
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/** |
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* Maximum amount of VM instructions to be executed per ScriptVM::exec() call |
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* in case loops are involved, before the script got automatically suspended |
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* for a certain amount of time to avoid any RT instability issues. |
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* |
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* The following value takes a max. execution time of 300 microseconds as aimed |
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* target, assuming an execution time of approximately 5 microseconds per |
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* instruction this leads to the very approximate value set below. |
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*/ |
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#define SCRIPTVM_MAX_INSTR_PER_CYCLE_SOFT 70 |
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/** |
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* Absolute maximum amount of VM instructions to be executed per |
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* ScriptVM::exec() call (even if no loops are involved), before the script got |
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* automatically suspended for a certain amount of time to avoid any RT |
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* instability issues. |
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* |
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* A distinction between "soft" and "hard" limit is done here ATM because a |
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* script author typically expects that his script might be interrupted |
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* automatically if he is using while() loops, however he might not be |
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* prepared that his script might also be interrupted if no loop is involved |
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* (i.e. on very large scripts). |
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* |
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* The following value takes a max. execution time of 1000 microseconds as |
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* aimed target, assuming an execution time of approximately 5 microseconds per |
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* instruction this leads to the very approximate value set below. |
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*/ |
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#define SCRIPTVM_MAX_INSTR_PER_CYCLE_HARD 210 |
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/** |
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* In case either SCRIPTVM_MAX_INSTR_PER_CYCLE_SOFT or |
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* SCRIPTVM_MAX_INSTR_PER_CYCLE_HARD was exceeded when calling |
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* ScriptVM::exec() : the amount of microseconds the respective script |
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* execution instance should be automatically suspended by the VM. |
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*/ |
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#define SCRIPT_VM_FORCE_SUSPENSION_MICROSECONDS 1000 |
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int InstrScript_parse(LinuxSampler::ParserContext*); |
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namespace LinuxSampler { |
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#if DEBUG_SCRIPTVM_CORE |
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static void _printIndents(int n) { |
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for (int i = 0; i < n; ++i) printf(" "); |
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fflush(stdout); |
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} |
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#endif |
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static int _requiredMaxStackSizeFor(Statement* statement, int depth = 0) { |
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if (!statement) return 1; |
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switch (statement->statementType()) { |
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case STMT_LEAF: |
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#if DEBUG_SCRIPTVM_CORE |
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_printIndents(depth); |
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printf("-> STMT_LEAF\n"); |
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#endif |
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return 1; |
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case STMT_LIST: { |
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#if DEBUG_SCRIPTVM_CORE |
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_printIndents(depth); |
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printf("-> STMT_LIST\n"); |
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#endif |
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Statements* stmts = (Statements*) statement; |
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int max = 0; |
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for (int i = 0; stmts->statement(i); ++i) { |
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int size = _requiredMaxStackSizeFor( stmts->statement(i), depth+1 ); |
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if (max < size) max = size; |
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} |
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return max + 1; |
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} |
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case STMT_BRANCH: { |
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#if DEBUG_SCRIPTVM_CORE |
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_printIndents(depth); |
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printf("-> STMT_BRANCH\n"); |
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#endif |
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BranchStatement* branchStmt = (BranchStatement*) statement; |
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int max = 0; |
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for (int i = 0; branchStmt->branch(i); ++i) { |
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int size = _requiredMaxStackSizeFor( branchStmt->branch(i), depth+1 ); |
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if (max < size) max = size; |
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} |
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return max + 1; |
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} |
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case STMT_LOOP: { |
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#if DEBUG_SCRIPTVM_CORE |
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_printIndents(depth); |
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printf("-> STMT_LOOP\n"); |
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#endif |
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While* whileStmt = (While*) statement; |
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if (whileStmt->statements()) |
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return _requiredMaxStackSizeFor( whileStmt->statements() ) + 1; |
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else |
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return 1; |
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} |
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} |
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return 1; // actually just to avoid compiler warning |
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} |
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static int _requiredMaxStackSizeFor(EventHandlers* handlers) { |
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int max = 1; |
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for (int i = 0; i < handlers->size(); ++i) { |
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int size = _requiredMaxStackSizeFor(handlers->eventHandler(i)); |
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if (max < size) max = size; |
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} |
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return max; |
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} |
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ScriptVM::ScriptVM() : m_eventHandler(NULL), m_parserContext(NULL), m_autoSuspend(true) { |
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m_fnMessage = new CoreVMFunction_message; |
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m_fnExit = new CoreVMFunction_exit; |
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m_fnWait = new CoreVMFunction_wait(this); |
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m_fnAbs = new CoreVMFunction_abs; |
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m_fnRandom = new CoreVMFunction_random; |
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m_fnNumElements = new CoreVMFunction_num_elements; |
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m_fnInc = new CoreVMFunction_inc; |
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m_fnDec = new CoreVMFunction_dec; |
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m_fnInRange = new CoreVMFunction_in_range; |
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m_varRealTimer = new CoreVMDynVar_NKSP_REAL_TIMER; |
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m_varPerfTimer = new CoreVMDynVar_NKSP_PERF_TIMER; |
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m_fnShLeft = new CoreVMFunction_sh_left; |
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m_fnShRight = new CoreVMFunction_sh_right; |
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m_fnMin = new CoreVMFunction_min; |
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m_fnMax = new CoreVMFunction_max; |
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} |
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ScriptVM::~ScriptVM() { |
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delete m_fnMessage; |
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delete m_fnExit; |
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delete m_fnWait; |
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delete m_fnAbs; |
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delete m_fnRandom; |
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delete m_fnNumElements; |
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delete m_fnInc; |
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delete m_fnDec; |
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delete m_fnInRange; |
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delete m_fnShLeft; |
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delete m_fnShRight; |
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delete m_fnMin; |
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delete m_fnMax; |
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delete m_varRealTimer; |
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delete m_varPerfTimer; |
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} |
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VMParserContext* ScriptVM::loadScript(const String& s) { |
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std::istringstream iss(s); |
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return loadScript(&iss); |
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} |
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VMParserContext* ScriptVM::loadScript(std::istream* is) { |
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ParserContext* context = new ParserContext(this); |
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//printf("parserCtx=0x%lx\n", (uint64_t)context); |
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context->registerBuiltInConstIntVariables( builtInConstIntVariables() ); |
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context->registerBuiltInIntVariables( builtInIntVariables() ); |
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context->registerBuiltInIntArrayVariables( builtInIntArrayVariables() ); |
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context->registerBuiltInDynVariables( builtInDynamicVariables() ); |
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context->createScanner(is); |
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InstrScript_parse(context); |
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dmsg(2,("Allocating %ld bytes of global int VM memory.\n", long(context->globalIntVarCount * sizeof(int)))); |
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dmsg(2,("Allocating %d of global VM string variables.\n", context->globalStrVarCount)); |
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if (!context->globalIntMemory) |
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context->globalIntMemory = new ArrayList<int>(); |
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if (!context->globalStrMemory) |
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context->globalStrMemory = new ArrayList<String>(); |
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context->globalIntMemory->resize(context->globalIntVarCount); |
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memset(&((*context->globalIntMemory)[0]), 0, context->globalIntVarCount * sizeof(int)); |
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context->globalStrMemory->resize(context->globalStrVarCount); |
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context->destroyScanner(); |
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return context; |
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} |
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void ScriptVM::dumpParsedScript(VMParserContext* context) { |
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ParserContext* ctx = dynamic_cast<ParserContext*>(context); |
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if (!ctx) { |
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std::cerr << "No VM context. So nothing to dump.\n"; |
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return; |
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} |
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if (!ctx->handlers) { |
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std::cerr << "No event handlers defined in script. So nothing to dump.\n"; |
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return; |
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} |
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if (!ctx->globalIntMemory) { |
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std::cerr << "Internal error: no global memory assigend to script VM.\n"; |
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return; |
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} |
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ctx->handlers->dump(); |
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} |
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VMExecContext* ScriptVM::createExecContext(VMParserContext* parserContext) { |
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ParserContext* parserCtx = dynamic_cast<ParserContext*>(parserContext); |
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ExecContext* execCtx = new ExecContext(); |
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if (parserCtx->requiredMaxStackSize < 0) { |
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parserCtx->requiredMaxStackSize = |
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_requiredMaxStackSizeFor(&*parserCtx->handlers); |
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} |
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execCtx->stack.resize(parserCtx->requiredMaxStackSize); |
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dmsg(2,("Created VM exec context with %ld bytes VM stack size.\n", |
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long(parserCtx->requiredMaxStackSize * sizeof(ExecContext::StackFrame)))); |
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//printf("execCtx=0x%lx\n", (uint64_t)execCtx); |
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const int polySize = parserCtx->polyphonicIntVarCount; |
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execCtx->polyphonicIntMemory.resize(polySize); |
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memset(&execCtx->polyphonicIntMemory[0], 0, polySize * sizeof(int)); |
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dmsg(2,("Allocated %ld bytes polyphonic memory.\n", long(polySize * sizeof(int)))); |
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return execCtx; |
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} |
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std::vector<VMSourceToken> ScriptVM::syntaxHighlighting(const String& s) { |
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std::istringstream iss(s); |
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return syntaxHighlighting(&iss); |
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} |
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std::vector<VMSourceToken> ScriptVM::syntaxHighlighting(std::istream* is) { |
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NkspScanner scanner(is); |
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std::vector<SourceToken> tokens = scanner.tokens(); |
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std::vector<VMSourceToken> result; |
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result.resize(tokens.size()); |
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for (int i = 0; i < tokens.size(); ++i) { |
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SourceToken* st = new SourceToken; |
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*st = tokens[i]; |
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result[i] = VMSourceToken(st); |
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} |
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return result; |
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} |
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VMFunction* ScriptVM::functionByName(const String& name) { |
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if (name == "message") return m_fnMessage; |
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else if (name == "exit") return m_fnExit; |
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else if (name == "wait") return m_fnWait; |
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else if (name == "abs") return m_fnAbs; |
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else if (name == "random") return m_fnRandom; |
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else if (name == "num_elements") return m_fnNumElements; |
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else if (name == "inc") return m_fnInc; |
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else if (name == "dec") return m_fnDec; |
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else if (name == "in_range") return m_fnInRange; |
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else if (name == "sh_left") return m_fnShLeft; |
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else if (name == "sh_right") return m_fnShRight; |
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else if (name == "min") return m_fnMin; |
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else if (name == "max") return m_fnMax; |
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return NULL; |
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} |
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std::map<String,VMIntRelPtr*> ScriptVM::builtInIntVariables() { |
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return std::map<String,VMIntRelPtr*>(); |
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} |
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std::map<String,VMInt8Array*> ScriptVM::builtInIntArrayVariables() { |
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return std::map<String,VMInt8Array*>(); |
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} |
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std::map<String,VMDynVar*> ScriptVM::builtInDynamicVariables() { |
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std::map<String,VMDynVar*> m; |
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m["$NKSP_PERF_TIMER"] = m_varPerfTimer; |
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m["$NKSP_REAL_TIMER"] = m_varRealTimer; |
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m["$KSP_TIMER"] = m_varRealTimer; |
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return m; |
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} |
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std::map<String,int> ScriptVM::builtInConstIntVariables() { |
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std::map<String,int> m; |
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m["$NI_CB_TYPE_INIT"] = VM_EVENT_HANDLER_INIT; |
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m["$NI_CB_TYPE_NOTE"] = VM_EVENT_HANDLER_NOTE; |
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m["$NI_CB_TYPE_RELEASE"] = VM_EVENT_HANDLER_RELEASE; |
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m["$NI_CB_TYPE_CONTROLLER"] = VM_EVENT_HANDLER_CONTROLLER; |
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return m; |
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} |
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VMEventHandler* ScriptVM::currentVMEventHandler() { |
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return m_eventHandler; |
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} |
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VMParserContext* ScriptVM::currentVMParserContext() { |
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return m_parserContext; |
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} |
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VMExecContext* ScriptVM::currentVMExecContext() { |
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if (!m_parserContext) return NULL; |
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return m_parserContext->execContext; |
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} |
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void ScriptVM::setAutoSuspendEnabled(bool b) { |
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m_autoSuspend = b; |
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} |
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bool ScriptVM::isAutoSuspendEnabled() const { |
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return m_autoSuspend; |
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} |
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VMExecStatus_t ScriptVM::exec(VMParserContext* parserContext, VMExecContext* execContex, VMEventHandler* handler) { |
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m_parserContext = dynamic_cast<ParserContext*>(parserContext); |
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if (!m_parserContext) { |
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std::cerr << "No VM parser context provided. Did you load a script?.\n"; |
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return VMExecStatus_t(VM_EXEC_NOT_RUNNING | VM_EXEC_ERROR); |
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} |
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// a ParserContext object is always tied to exactly one ScriptVM object |
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assert(m_parserContext->functionProvider == this); |
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ExecContext* ctx = dynamic_cast<ExecContext*>(execContex); |
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if (!ctx) { |
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std::cerr << "Invalid VM exec context.\n"; |
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return VMExecStatus_t(VM_EXEC_NOT_RUNNING | VM_EXEC_ERROR); |
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} |
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EventHandler* h = dynamic_cast<EventHandler*>(handler); |
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if (!h) return VM_EXEC_NOT_RUNNING; |
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m_eventHandler = handler; |
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m_parserContext->execContext = ctx; |
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ctx->status = VM_EXEC_RUNNING; |
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StmtFlags_t flags = STMT_SUCCESS; |
348 |
schoenebeck |
2974 |
int instructionsCounter = 0; |
349 |
schoenebeck |
2581 |
|
350 |
|
|
int& frameIdx = ctx->stackFrame; |
351 |
|
|
if (frameIdx < 0) { // start condition ... |
352 |
|
|
frameIdx = -1; |
353 |
|
|
ctx->pushStack(h); |
354 |
|
|
} |
355 |
|
|
|
356 |
|
|
while (flags == STMT_SUCCESS && frameIdx >= 0) { |
357 |
|
|
if (frameIdx >= ctx->stack.size()) { // should never happen, otherwise it's a bug ... |
358 |
|
|
std::cerr << "CRITICAL: VM stack overflow! (" << frameIdx << ")\n"; |
359 |
|
|
flags = StmtFlags_t(STMT_ABORT_SIGNALLED | STMT_ERROR_OCCURRED); |
360 |
|
|
break; |
361 |
|
|
} |
362 |
|
|
|
363 |
|
|
ExecContext::StackFrame& frame = ctx->stack[frameIdx]; |
364 |
|
|
switch (frame.statement->statementType()) { |
365 |
|
|
case STMT_LEAF: { |
366 |
|
|
#if DEBUG_SCRIPTVM_CORE |
367 |
|
|
_printIndents(frameIdx); |
368 |
|
|
printf("-> STMT_LEAF\n"); |
369 |
|
|
#endif |
370 |
|
|
LeafStatement* leaf = (LeafStatement*) frame.statement; |
371 |
|
|
flags = leaf->exec(); |
372 |
|
|
ctx->popStack(); |
373 |
|
|
break; |
374 |
|
|
} |
375 |
|
|
|
376 |
|
|
case STMT_LIST: { |
377 |
|
|
#if DEBUG_SCRIPTVM_CORE |
378 |
|
|
_printIndents(frameIdx); |
379 |
|
|
printf("-> STMT_LIST subidx=%d\n", frame.subindex); |
380 |
|
|
#endif |
381 |
|
|
Statements* stmts = (Statements*) frame.statement; |
382 |
|
|
if (stmts->statement(frame.subindex)) { |
383 |
|
|
ctx->pushStack( |
384 |
|
|
stmts->statement(frame.subindex++) |
385 |
|
|
); |
386 |
|
|
} else { |
387 |
|
|
#if DEBUG_SCRIPTVM_CORE |
388 |
|
|
_printIndents(frameIdx); |
389 |
|
|
printf("[END OF LIST] subidx=%d\n", frame.subindex); |
390 |
|
|
#endif |
391 |
|
|
ctx->popStack(); |
392 |
|
|
} |
393 |
|
|
break; |
394 |
|
|
} |
395 |
|
|
|
396 |
|
|
case STMT_BRANCH: { |
397 |
|
|
#if DEBUG_SCRIPTVM_CORE |
398 |
|
|
_printIndents(frameIdx); |
399 |
|
|
printf("-> STMT_BRANCH\n"); |
400 |
|
|
#endif |
401 |
|
|
if (frame.subindex < 0) ctx->popStack(); |
402 |
|
|
else { |
403 |
|
|
BranchStatement* branchStmt = (BranchStatement*) frame.statement; |
404 |
|
|
frame.subindex = branchStmt->evalBranch(); |
405 |
|
|
if (frame.subindex >= 0) { |
406 |
|
|
ctx->pushStack( |
407 |
|
|
branchStmt->branch(frame.subindex) |
408 |
|
|
); |
409 |
|
|
frame.subindex = -1; |
410 |
|
|
} else ctx->popStack(); |
411 |
|
|
} |
412 |
|
|
break; |
413 |
|
|
} |
414 |
|
|
|
415 |
|
|
case STMT_LOOP: { |
416 |
|
|
#if DEBUG_SCRIPTVM_CORE |
417 |
|
|
_printIndents(frameIdx); |
418 |
|
|
printf("-> STMT_LOOP\n"); |
419 |
|
|
#endif |
420 |
|
|
While* whileStmt = (While*) frame.statement; |
421 |
|
|
if (whileStmt->evalLoopStartCondition() && whileStmt->statements()) { |
422 |
|
|
ctx->pushStack( |
423 |
|
|
whileStmt->statements() |
424 |
|
|
); |
425 |
schoenebeck |
2974 |
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 |
schoenebeck |
2581 |
} else ctx->popStack(); |
432 |
schoenebeck |
2974 |
break; |
433 |
schoenebeck |
2581 |
} |
434 |
|
|
} |
435 |
schoenebeck |
2974 |
|
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 |
schoenebeck |
2581 |
} |
445 |
|
|
|
446 |
|
|
if (flags & STMT_SUSPEND_SIGNALLED) { |
447 |
|
|
ctx->status = VM_EXEC_SUSPENDED; |
448 |
|
|
} else { |
449 |
|
|
ctx->status = VM_EXEC_NOT_RUNNING; |
450 |
|
|
if (flags & STMT_ERROR_OCCURRED) |
451 |
|
|
ctx->status = VM_EXEC_ERROR; |
452 |
|
|
ctx->reset(); |
453 |
|
|
} |
454 |
|
|
|
455 |
schoenebeck |
2879 |
m_eventHandler = NULL; |
456 |
schoenebeck |
2588 |
m_parserContext->execContext = NULL; |
457 |
|
|
m_parserContext = NULL; |
458 |
schoenebeck |
2581 |
return ctx->status; |
459 |
|
|
} |
460 |
|
|
|
461 |
|
|
} // namespace LinuxSampler |