/[svn]/linuxsampler/trunk/src/scriptvm/common.h
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revision 2948 by schoenebeck, Fri Jul 15 15:29:04 2016 UTC revision 3277 by schoenebeck, Mon Jun 5 18:40:18 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 157  namespace LinuxSampler { Line 157  namespace LinuxSampler {
157           * expressions to an array expression for you, instead this method will           * expressions to an array expression for you, instead this method will
158           * simply return NULL!           * simply return NULL!
159           *           *
160             * @b Note: this method is currently, and in contrast to its other
161             * counter parts, declared as virtual method. Some deriving classes are
162             * currently using this to override this default implementation in order
163             * to implement an "evaluate now as integer array" behavior. This has
164             * efficiency reasons, however this also currently makes this part of
165             * the API less clean and should thus be addressed in future with
166             * appropriate changes to the API.
167             *
168           * @see exprType()           * @see exprType()
169           */           */
170          VMIntArrayExpr* asIntArray() const;          virtual VMIntArrayExpr* asIntArray() const;
171    
172          /**          /**
173           * Returns true in case this expression can be considered to be a           * Returns true in case this expression can be considered to be a
# Line 168  namespace LinuxSampler { Line 176  namespace LinuxSampler {
176           * expression's constant value may be evaluated already at script           * expression's constant value may be evaluated already at script
177           * parse time, which may result in performance benefits during script           * parse time, which may result in performance benefits during script
178           * runtime.           * runtime.
179             *
180             * @b NOTE: A constant expression is per se always also non modifyable.
181             * But a non modifyable expression may not necessarily be a constant
182             * expression!
183             *
184             * @see isModifyable()
185           */           */
186          virtual bool isConstExpr() const = 0;          virtual bool isConstExpr() const = 0;
187    
188            /**
189             * Returns true in case this expression is allowed to be modified.
190             * If this method returns @c false then this expression must be handled
191             * as read-only expression, which means that assigning a new value to it
192             * is either not possible or not allowed.
193             *
194             * @b NOTE: A constant expression is per se always also non modifyable.
195             * But a non modifyable expression may not necessarily be a constant
196             * expression!
197             *
198             * @see isConstExpr()
199             */
200          bool isModifyable() const;          bool isModifyable() const;
201      };      };
202    
# Line 521  namespace LinuxSampler { Line 547  namespace LinuxSampler {
547          }          }
548      };      };
549    
550        #if HAVE_CXX_EMBEDDED_PRAGMA_DIAGNOSTICS
551        # define COMPILER_DISABLE_OFFSETOF_WARNING                    \
552            _Pragma("GCC diagnostic push")                            \
553            _Pragma("GCC diagnostic ignored \"-Winvalid-offsetof\"")
554        # define COMPILER_RESTORE_OFFSETOF_WARNING \
555            _Pragma("GCC diagnostic pop")
556        #else
557        # define COMPILER_DISABLE_OFFSETOF_WARNING
558        # define COMPILER_RESTORE_OFFSETOF_WARNING
559        #endif
560    
561      /**      /**
562       * Convenience macro for initializing VMIntRelPtr and VMInt8RelPtr       * Convenience macro for initializing VMIntRelPtr and VMInt8RelPtr
563       * structures. Usage example:       * structures. Usage example:
# Line 563  namespace LinuxSampler { Line 600  namespace LinuxSampler {
600       * complexity inside the sampler engines which provide the actual script       * complexity inside the sampler engines which provide the actual script
601       * functionalities.       * functionalities.
602       */       */
603      #define DECLARE_VMINT(basePtr, T_struct, T_member) ( \      #define DECLARE_VMINT(basePtr, T_struct, T_member) (          \
604          (VMRelPtr) {                                     \          /* Disable offsetof warning, trust us, we are cautios. */ \
605              (void**) &basePtr,                           \          COMPILER_DISABLE_OFFSETOF_WARNING                         \
606              offsetof(T_struct, T_member),                \          (VMRelPtr) {                                              \
607              false                                        \              (void**) &basePtr,                                    \
608          }                                                \              offsetof(T_struct, T_member),                         \
609      )                                                    \              false                                                 \
610            }                                                         \
611            COMPILER_RESTORE_OFFSETOF_WARNING                         \
612        )                                                             \
613    
614      /**      /**
615       * Same as DECLARE_VMINT(), but this one defines the VMIntRelPtr and       * Same as DECLARE_VMINT(), but this one defines the VMIntRelPtr and
# Line 585  namespace LinuxSampler { Line 625  namespace LinuxSampler {
625       * @see ScriptVM::builtInConstIntVariables()       * @see ScriptVM::builtInConstIntVariables()
626       */       */
627      #define DECLARE_VMINT_READONLY(basePtr, T_struct, T_member) ( \      #define DECLARE_VMINT_READONLY(basePtr, T_struct, T_member) ( \
628          (VMRelPtr) {                                          \          /* Disable offsetof warning, trust us, we are cautios. */ \
629              (void**) &basePtr,                                \          COMPILER_DISABLE_OFFSETOF_WARNING                         \
630              offsetof(T_struct, T_member),                     \          (VMRelPtr) {                                              \
631              true                                              \              (void**) &basePtr,                                    \
632          }                                                     \              offsetof(T_struct, T_member),                         \
633      )                                                         \              true                                                  \
634            }                                                         \
635            COMPILER_RESTORE_OFFSETOF_WARNING                         \
636        )                                                             \
637    
638      /** @brief Built-in VM 8 bit integer array variable.      /** @brief Built-in VM 8 bit integer array variable.
639       *       *
# Line 601  namespace LinuxSampler { Line 644  namespace LinuxSampler {
644      struct VMInt8Array {      struct VMInt8Array {
645          int8_t* data;          int8_t* data;
646          int size;          int size;
647            bool readonly; ///< Whether the array data may be modified or just be read.
648    
649          VMInt8Array() : data(NULL), size(0) {}          VMInt8Array() : data(NULL), size(0), readonly(false) {}
650      };      };
651    
652      /** @brief Virtual machine script variable.      /** @brief Virtual machine script variable.
# Line 690  namespace LinuxSampler { Line 734  namespace LinuxSampler {
734           * @param expr - new value to be assigned to this variable           * @param expr - new value to be assigned to this variable
735           */           */
736          void assignExpr(VMExpr* expr) OVERRIDE {}          void assignExpr(VMExpr* expr) OVERRIDE {}
737    
738            virtual ~VMDynVar() {}
739      };      };
740    
741      /** @brief Dynamically executed variable (of integer data type).      /** @brief Dynamically executed variable (of integer data type).
# Line 712  namespace LinuxSampler { Line 758  namespace LinuxSampler {
758      public:      public:
759      };      };
760    
761        /** @brief Dynamically executed variable (of integer array data type).
762         *
763         * This is the base class for all built-in integer array script variables
764         * whose variable content needs to be provided dynamically by executable
765         * native code on each script variable access.
766         */
767        class VMDynIntArrayVar : virtual public VMDynVar, virtual public VMIntArrayExpr {
768        public:
769        };
770    
771      /** @brief Provider for built-in script functions and variables.      /** @brief Provider for built-in script functions and variables.
772       *       *
773       * Abstract base class defining the high-level interface for all classes       * Abstract base class defining the high-level interface for all classes
# Line 795  namespace LinuxSampler { Line 851  namespace LinuxSampler {
851           * @see ScriptVM::exec()           * @see ScriptVM::exec()
852           */           */
853          virtual int suspensionTimeMicroseconds() const = 0;          virtual int suspensionTimeMicroseconds() const = 0;
854    
855            /**
856             * Causes all polyphonic variables to be reset to zero values. A
857             * polyphonic variable is expected to be zero when entering a new event
858             * handler instance. As an exception the values of polyphonic variables
859             * shall only be preserved from an note event handler instance to its
860             * correspending specific release handler instance. So in the latter
861             * case the script author may pass custom data from the note handler to
862             * the release handler, but only for the same specific note!
863             */
864            virtual void resetPolyphonicData() = 0;
865    
866            /**
867             * Returns amount of virtual machine instructions which have been
868             * performed the last time when this execution context was executing a
869             * script. So in case you need the overall amount of instructions
870             * instead, then you need to add them by yourself after each
871             * ScriptVM::exec() call.
872             */
873            virtual size_t instructionsPerformed() const = 0;
874    
875            /**
876             * Sends a signal to this script execution instance to abort its script
877             * execution as soon as possible. This method is called i.e. when one
878             * script execution instance intends to stop another script execution
879             * instance.
880             */
881            virtual void signalAbort() = 0;
882      };      };
883    
884      /** @brief Script callback for a certain event.      /** @brief Script callback for a certain event.
# Line 830  namespace LinuxSampler { Line 914  namespace LinuxSampler {
914       * issue (either a parser error or parser warning), a human readable       * issue (either a parser error or parser warning), a human readable
915       * explanation text of the error or warning and the location of the       * explanation text of the error or warning and the location of the
916       * encountered parser issue within the script.       * encountered parser issue within the script.
917         *
918         * @see VMSourceToken for processing syntax highlighting instead.
919       */       */
920      struct ParserIssue {      struct ParserIssue {
921          String txt; ///< Human readable explanation text of the parser issue.          String txt; ///< Human readable explanation text of the parser issue.
# Line 948  namespace LinuxSampler { Line 1034  namespace LinuxSampler {
1034       * This class is not actually used by the sampler itself. It is rather       * This class is not actually used by the sampler itself. It is rather
1035       * provided for external script editor applications. Primary purpose of       * provided for external script editor applications. Primary purpose of
1036       * this class is syntax highlighting for external script editors.       * this class is syntax highlighting for external script editors.
1037         *
1038         * @see ParserIssue for processing compile errors and warnings instead.
1039       */       */
1040      class VMSourceToken {      class VMSourceToken {
1041      public:      public:
# Line 960  namespace LinuxSampler { Line 1048  namespace LinuxSampler {
1048          String text() const;          String text() const;
1049    
1050          // position of token in script          // position of token in script
1051          int firstLine() const; ///< First line this source token is located at in script source code (indexed with 0 being the very first line).          int firstLine() const; ///< First line this source token is located at in script source code (indexed with 0 being the very first line). Most source code tokens are not spanning over multiple lines, the only current exception are comments, in the latter case you need to process text() to get the last line and last column for the comment.
1052          int firstColumn() const; ///< Last line this source token is located at in script source code.          int firstColumn() const; ///< First column on the first line this source token is located at in script source code (indexed with 0 being the very first column). To get the length of this token use text().length().
1053    
1054          // base types          // base types
1055          bool isEOF() const;          bool isEOF() const; ///< Returns true in case this source token represents the end of the source code file.
1056          bool isNewLine() const;          bool isNewLine() const; ///< Returns true in case this source token represents a line feed character (i.e. "\n" on Unix systems).
1057          bool isKeyword() const;          bool isKeyword() const; ///< Returns true in case this source token represents a language keyword (i.e. "while", "function", "declare", "on", etc.).
1058          bool isVariableName() const;          bool isVariableName() const; ///< Returns true in case this source token represents a variable name (i.e. "$someIntVariable", "%someArrayVariable", "\@someStringVariable"). @see isIntegerVariable(), isStringVariable(), isArrayVariable() for the precise variable type.
1059          bool isIdentifier() const;          bool isIdentifier() const; ///< Returns true in case this source token represents an identifier, which currently always means a function name.
1060          bool isNumberLiteral() const;          bool isNumberLiteral() const; ///< Returns true in case this source token represents a number literal (i.e. 123).
1061          bool isStringLiteral() const;          bool isStringLiteral() const; ///< Returns true in case this source token represents a string literal (i.e. "Some text").
1062          bool isComment() const;          bool isComment() const; ///< Returns true in case this source token represents a source code comment.
1063          bool isPreprocessor() const;          bool isPreprocessor() const; ///< Returns true in case this source token represents a preprocessor statement.
1064          bool isOther() const;          bool isOther() const; ///< Returns true in case this source token represents anything else not covered by the token types mentioned above.
1065    
1066          // extended types          // extended types
1067          bool isIntegerVariable() const;          bool isIntegerVariable() const; ///< Returns true in case this source token represents an integer variable name (i.e. "$someIntVariable").
1068          bool isStringVariable() const;          bool isStringVariable() const; ///< Returns true in case this source token represents an string variable name (i.e. "\@someStringVariable").
1069          bool isArrayVariable() const;          bool isArrayVariable() const; ///< Returns true in case this source token represents an array variable name (i.e. "%someArryVariable").
1070          bool isEventHandlerName() const;          bool isEventHandlerName() const; ///< Returns true in case this source token represents an event handler name (i.e. "note", "release", "controller").
1071    
1072          VMSourceToken& operator=(const VMSourceToken& other);          VMSourceToken& operator=(const VMSourceToken& other);
1073    
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