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/* |
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* Copyright (c) 2014 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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// This header defines data types shared between the VM core implementation |
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// (inside the current source directory) and other parts of the sampler |
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// (located at other source directories). |
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#ifndef LS_INSTR_SCRIPT_PARSER_COMMON_H |
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#define LS_INSTR_SCRIPT_PARSER_COMMON_H |
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#include "../common/global.h" |
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#include <vector> |
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#include <map> |
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#include <stddef.h> // offsetof() |
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namespace LinuxSampler { |
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enum ParserIssueType_t { |
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PARSER_ERROR, |
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PARSER_WARNING |
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}; |
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enum ExprType_t { |
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EMPTY_EXPR, ///< i.e. on invalid expressions or i.e. a function call that does not return a result value |
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INT_EXPR, |
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INT_ARR_EXPR, |
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STRING_EXPR, |
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STRING_ARR_EXPR, |
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}; |
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enum StmtFlags_t { |
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STMT_SUCCESS = 0, ///< Function / statement was executed successfully, no error occurred. |
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STMT_ABORT_SIGNALLED = 1, ///< VM should stop the current callback execution (usually because of an error, but might also be without an error reason). |
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STMT_SUSPEND_SIGNALLED = (1<<1), |
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STMT_ERROR_OCCURRED = (1<<2), |
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}; |
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enum VMExecStatus_t { |
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VM_EXEC_NOT_RUNNING = 0, |
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VM_EXEC_RUNNING = 1, |
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VM_EXEC_SUSPENDED = (1<<1), |
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VM_EXEC_ERROR = (1<<2), |
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}; |
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class VMIntExpr; |
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class VMStringExpr; |
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class VMExpr { |
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public: |
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virtual ExprType_t exprType() const = 0; |
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VMIntExpr* asInt() const; |
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VMStringExpr* asString() const; |
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}; |
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class VMIntExpr : virtual public VMExpr { |
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public: |
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virtual int evalInt() = 0; |
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ExprType_t exprType() const { return INT_EXPR; } |
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}; |
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class VMStringExpr : virtual public VMExpr { |
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public: |
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virtual String evalStr() = 0; |
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ExprType_t exprType() const { return STRING_EXPR; } |
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}; |
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class VMFnArgs { |
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public: |
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virtual int argsCount() const = 0; |
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virtual VMExpr* arg(int i) = 0; |
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}; |
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class VMFnResult { |
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public: |
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virtual VMExpr* resultValue() = 0; |
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virtual StmtFlags_t resultFlags() { return STMT_SUCCESS; } |
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}; |
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/** @brief VM built-in function. |
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* |
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* Abstract base class for built-in script functions, defining the interface |
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* for all built-in script function implementations. |
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*/ |
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class VMFunction { |
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public: |
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/** |
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* Script data type of the function's return value. If the function does |
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* not return any value, then it returns EMPTY_EXPR here. |
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*/ |
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virtual ExprType_t returnType() = 0; |
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|
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/** |
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* Minimum amount of function arguments this function accepts. If a |
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* script is calling this function with less arguments, the script |
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* parser will throw a parser error. |
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*/ |
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virtual int minRequiredArgs() const = 0; |
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/** |
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* Maximum amount of function arguments this functions accepts. If a |
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* script is calling this function with more arguments, the script |
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* parser will throw a parser error. |
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*/ |
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virtual int maxAllowedArgs() const = 0; |
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|
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/** |
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* Script data type of the function's @c iArg 'th function argument. |
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* The information provided here is less strong than acceptsArgType(). |
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* The parser will compare argument data types provided in scripts by |
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* calling cceptsArgType(). The return value of argType() is used by the |
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* parser instead to show an appropriate parser error which data type |
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* this function usually expects as "default" data type. Reason: a |
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* function may accept multiple data types for a certain function |
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* argument and would automatically cast the passed argument value in |
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* that case to the type it actually needs. |
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* |
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* @param iArg - index of the function argument in question |
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*/ |
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virtual ExprType_t argType(int iArg) const = 0; |
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|
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/** |
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* This function is called by the parser to check whether arguments |
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* passed in scripts to this function are accepted by this function. If |
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* a script calls this function with an argument's data type not |
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* accepted by this function, the parser will throw a parser error. |
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* |
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* @param iArg - index of the function argument in question |
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* @param type - script data type used for this function argument by |
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* currently parsed script |
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*/ |
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virtual bool acceptsArgType(int iArg, ExprType_t type) const = 0; |
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|
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/** |
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* Implements the actual function execution. This function is called by |
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* the VM when this function shall be executed at script runtime. |
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* |
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* @param args - function arguments for executing this built-in function |
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*/ |
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virtual VMFnResult* exec(VMFnArgs* args) = 0; |
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/** |
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* Concenience method for function implementations to show warning |
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* messages. |
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* |
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* @param txt - warning text |
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*/ |
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void wrnMsg(const String& txt); |
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/** |
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* Concenience method for function implementations to show error |
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* messages. |
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* |
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* @param txt - error text |
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*/ |
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void errMsg(const String& txt); |
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}; |
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/** |
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* POD base of VMIntRelPtr and VMInt8RelPtr structures. Not intended to be |
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* used directly. Use VMIntRelPtr or VMInt8RelPtr instead. |
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*/ |
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struct VMRelPtr { |
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void** base; ///< Base pointer. |
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int offset; ///< Offset (in bytes) to base pointer. |
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}; |
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/** @brief Pointer to built-in VM integer variable (of C/C++ type int). |
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* |
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* Used for defining built-in integer script variables. |
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* |
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* @b CAUTION: You may only use this class for pointing to C/C++ variables |
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* of type "int" (which on most systems is 32 bit in size). If the C/C++ int |
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* variable you want to reference is only 8 bit in size, then you @b must |
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* use VMInt8RelPtr instead! |
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* |
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* For efficiency reasons the actual native C/C++ int variable is referenced |
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* by two components here. The actual native int C/C++ variable in memory |
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* is dereferenced at VM run-time by taking the @c base pointer dereference |
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* and adding @c offset bytes. This has the advantage that for a large |
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* number of built-in int variables, only one (or few) base pointer need |
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* to be re-assigned before running a script, instead of updating each |
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* built-in variable each time before a script is executed. |
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* |
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* Refer to DECLARE_VMINT() for example code. |
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* |
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* @see VMInt8RelPtr, DECLARE_VMINT() |
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*/ |
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struct VMIntRelPtr : VMRelPtr { |
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VMIntRelPtr() { |
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base = NULL; |
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offset = 0; |
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} |
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VMIntRelPtr(const VMRelPtr& data) { |
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base = data.base; |
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offset = data.offset; |
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} |
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virtual int evalInt() { return *(int*)&(*(uint8_t**)base)[offset]; } |
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virtual void assign(int i) { *(int*)&(*(uint8_t**)base)[offset] = i; } |
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}; |
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/** @brief Pointer to built-in VM integer variable (of C/C++ type int8_t). |
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* |
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* Used for defining built-in integer script variables. |
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* |
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* @b CAUTION: You may only use this class for pointing to C/C++ variables |
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* of type "int8_t" (8 bit integer). If the C/C++ int variable you want to |
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* reference is an "int" type (which is 32 bit on most systems), then you |
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* @b must use VMIntRelPtr instead! |
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* |
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* For efficiency reasons the actual native C/C++ int variable is referenced |
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* by two components here. The actual native int C/C++ variable in memory |
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* is dereferenced at VM run-time by taking the @c base pointer dereference |
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* and adding @c offset bytes. This has the advantage that for a large |
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* number of built-in int variables, only one (or few) base pointer need |
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* to be re-assigned before running a script, instead of updating each |
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* built-in variable each time before a script is executed. |
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* |
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* Refer to DECLARE_VMINT() for example code. |
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* |
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* @see VMIntRelPtr, DECLARE_VMINT() |
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*/ |
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struct VMInt8RelPtr : VMIntRelPtr { |
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VMInt8RelPtr() : VMIntRelPtr() {} |
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VMInt8RelPtr(const VMRelPtr& data) : VMIntRelPtr(data) {} |
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virtual int evalInt() OVERRIDE { |
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return *(uint8_t*)&(*(uint8_t**)base)[offset]; |
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} |
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virtual void assign(int i) OVERRIDE { |
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*(uint8_t*)&(*(uint8_t**)base)[offset] = i; |
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} |
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}; |
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/** |
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* Convenience macro for initializing VMIntRelPtr and VMInt8RelPtr |
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* structures. Example: |
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* @code |
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* struct Foo { |
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* uint8_t a; |
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* int b; |
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* }; |
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* |
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* Foo foo1 = (Foo) { 1, 3000 }; |
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* Foo foo2 = (Foo) { 2, 4000 }; |
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* |
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* Foo* pFoo; |
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* |
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* VMInt8RelPtr var1 = DECLARE_VMINT(pFoo, class Foo, a); |
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* VMIntRelPtr var2 = DECLARE_VMINT(pFoo, class Foo, b); |
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* |
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* pFoo = &foo1; |
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* printf("%d\n", var1->evalInt()); // will print 1 |
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* printf("%d\n", var2->evalInt()); // will print 3000 |
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* |
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* pFoo = &foo2; |
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* printf("%d\n", var1->evalInt()); // will print 2 |
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* printf("%d\n", var2->evalInt()); // will print 4000 |
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* @endcode |
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*/ |
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#define DECLARE_VMINT(basePtr, T_struct, T_member) ( \ |
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(VMRelPtr) { \ |
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(void**) &basePtr, \ |
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offsetof(T_struct, T_member) \ |
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} \ |
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) \ |
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/** @brief Built-in VM 8 bit integer array variable. |
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* |
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* Used for defining built-in integer array script variables. |
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*/ |
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struct VMInt8Array { |
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int8_t* data; |
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int size; |
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VMInt8Array() : data(NULL), size(0) {} |
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}; |
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/** @brief Provider for built-in script functions and variables. |
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* |
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* Abstract base class defining the interface for all classes which add and |
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* implement built-in script functions and built-in script variables. |
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*/ |
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class VMFunctionProvider { |
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public: |
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/** |
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* Returns pointer to the built-in function with the given function |
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* name, or NULL if there is no built-in function with that name. |
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* |
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* @param name - function name |
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*/ |
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virtual VMFunction* functionByName(const String& name) = 0; |
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/** |
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* Returns a variable name indexed map of all built-in script variables |
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* which point to native "int" (usually 32 bit) variables. |
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*/ |
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virtual std::map<String,VMIntRelPtr*> builtInIntVariables() = 0; |
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/** |
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* Returns a variable name indexed map of all built-in script variables |
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* which point to native "int8_t" (8 bit) variables. |
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*/ |
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virtual std::map<String,VMInt8Array*> builtInIntArrayVariables() = 0; |
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/** |
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* Returns a variable name indexed map of all built-in constant script |
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* variables, which never change their value at runtime. |
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*/ |
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virtual std::map<String,int> builtInConstIntVariables() = 0; |
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}; |
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/** @brief Execution state of a virtual machine. |
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* |
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* An instance of this abstract base class represents exactly one execution |
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* state of a virtual machine. This encompasses most notably the VM |
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* execution stack, and VM polyphonic variables. It does not contain global |
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* variable. Global variables are contained in the VMParserContext object. |
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* You might see a VMExecContext object as one virtual thread of the virtual |
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* machine. |
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* |
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* In contrast to a VMParserContext, a VMExecContext is not tied to a |
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* ScriptVM instance. Thus you can use a VMExecContext with different |
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* ScriptVM instances, however not concurrently at the same time. |
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* |
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* @see VMParserContext |
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*/ |
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class VMExecContext { |
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public: |
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virtual ~VMExecContext() {} |
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virtual int suspensionTimeMicroseconds() const = 0; |
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}; |
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class VMEventHandler { |
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public: |
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virtual String eventHandlerName() const = 0; |
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}; |
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struct ParserIssue { |
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String txt; |
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int line; |
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ParserIssueType_t type; |
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inline void dump() { |
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switch (type) { |
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case PARSER_ERROR: |
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printf("[ERROR] line %d: %s\n", line, txt.c_str()); |
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break; |
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case PARSER_WARNING: |
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printf("[Warning] line %d: %s\n", line, txt.c_str()); |
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break; |
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} |
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} |
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inline bool isErr() const { return type == PARSER_ERROR; } |
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inline bool isWrn() const { return type == PARSER_WARNING; } |
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}; |
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inline String typeStr(const ExprType_t& type) { |
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switch (type) { |
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case EMPTY_EXPR: return "empty"; |
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case INT_EXPR: return "integer"; |
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case INT_ARR_EXPR: return "integer array"; |
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case STRING_EXPR: return "string"; |
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case STRING_ARR_EXPR: return "string array"; |
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} |
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return "invalid"; |
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} |
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/** @brief Virtual machine representation of a script. |
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* |
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* An instance of this abstract base class represents a parsed script, |
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* translated into a virtual machine. You should first check if there were |
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* any parser errors. If there were any parser errors, you should refrain |
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* from executing the virtual machine. Otherwise if there were no parser |
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* errors (i.e. only warnings), then you might access one of the script's |
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* event handlers by i.e. calling eventHandlerByName() and pass the |
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* respective event handler to the ScriptVM class (or to one of its |
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* descendants) for execution. |
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* |
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* @see VMExecContext |
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*/ |
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schoenebeck |
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class VMParserContext { |
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public: |
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virtual ~VMParserContext() {} |
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virtual std::vector<ParserIssue> issues() const = 0; |
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virtual std::vector<ParserIssue> errors() const = 0; |
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virtual std::vector<ParserIssue> warnings() const = 0; |
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virtual VMEventHandler* eventHandler(uint index) = 0; |
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virtual VMEventHandler* eventHandlerByName(const String& name) = 0; |
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}; |
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|
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schoenebeck |
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} // namespace LinuxSampler |
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#endif // LS_INSTR_SCRIPT_PARSER_COMMON_H |