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#include "../common/global.h" |
#include "../common/global.h" |
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#include <vector> |
#include <vector> |
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#include <map> |
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#include <stddef.h> // offsetof() |
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|
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namespace LinuxSampler { |
namespace LinuxSampler { |
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|
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virtual VMFnResult* exec(VMFnArgs* args) = 0; |
virtual VMFnResult* exec(VMFnArgs* args) = 0; |
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}; |
}; |
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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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|
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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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/** |
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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) ( \ |
192 |
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(VMRelPtr) { \ |
193 |
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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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|
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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. |
201 |
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*/ |
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struct VMInt8Array { |
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int8_t* data; |
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int size; |
205 |
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|
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VMInt8Array() : data(NULL), size(0) {} |
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}; |
208 |
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|
209 |
class VMFunctionProvider { |
class VMFunctionProvider { |
210 |
public: |
public: |
211 |
virtual VMFunction* functionByName(const String& name) = 0; |
virtual VMFunction* functionByName(const String& name) = 0; |
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virtual std::map<String,VMIntRelPtr*> builtInIntVariables() = 0; |
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virtual std::map<String,VMInt8Array*> builtInIntArrayVariables() = 0; |
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virtual std::map<String,int> builtInConstIntVariables() = 0; |
215 |
}; |
}; |
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|
217 |
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/** @brief Execution state of a virtual machine. |
218 |
|
* |
219 |
|
* An instance of this abstract base class represents exactly one execution |
220 |
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* state of a virtual machine. This encompasses most notably the VM |
221 |
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* execution stack, and VM polyphonic variables. You might see it as one |
222 |
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* virtual thread of the virtual machine. |
223 |
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* |
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* @see VMParserContext |
225 |
|
*/ |
226 |
class VMExecContext { |
class VMExecContext { |
227 |
public: |
public: |
228 |
virtual ~VMExecContext() {} |
virtual ~VMExecContext() {} |
265 |
return "invalid"; |
return "invalid"; |
266 |
} |
} |
267 |
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|
268 |
|
/** @brief Virtual machine representation of a script. |
269 |
|
* |
270 |
|
* An instance of this abstract base class represents a parsed script, |
271 |
|
* translated into a virtual machine. You should first check if there were |
272 |
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* any parser errors. If there were any parser errors, you should refrain |
273 |
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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 |
276 |
|
* respective event handler to the ScriptVM class (or to one of its |
277 |
|
* descendants) for execution. |
278 |
|
* |
279 |
|
* @see VMExecContext |
280 |
|
*/ |
281 |
class VMParserContext { |
class VMParserContext { |
282 |
public: |
public: |
283 |
virtual ~VMParserContext() {} |
virtual ~VMParserContext() {} |