4.5. Calls
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SQRESULT sq_call(HSQUIRRELVM v, SQInteger params, SQBool retval, SQBool raiseerror)
- Parameters:
v (HSQUIRRELVM) – the target VM
params (SQInteger) – number of parameters of the function
retval (SQBool) – if true the function will push the return value in the stack
raiseerror (SQBool) – if true, if a runtime error occurs during the execution of the call, the vm will invoke the error handler.
- Returns:
a SQRESULT
calls a closure or a native closure. The function pops all the parameters and leave the closure in the stack; if retval is true the return value of the closure is pushed. If the execution of the function is suspended through sq_suspendvm(), the closure and the arguments will not be automatically popped from the stack.
When using to create an instance, push a dummy parameter to be filled with the newly-created instance for the constructor’s ‘this’ parameter.
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SQRESULT sq_getcallee(HSQUIRRELVM v)
- Parameters:
v (HSQUIRRELVM) – the target VM
- Returns:
a SQRESULT
push in the stack the currently running closure.
-
SQRESULT sq_getlasterror(HSQUIRRELVM v)
- Parameters:
v (HSQUIRRELVM) – the target VM
- Returns:
a SQRESULT
- Remarks:
the pushed error descriptor can be any valid squirrel type.
pushes the last error in the stack.
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const SQChar *sq_getlocal(HSQUIRRELVM v, SQUnsignedInteger level, SQUnsignedInteger nseq)
- Parameters:
v (HSQUIRRELVM) – the target VM
level (SQUnsignedInteger) – the function index in the calls stack, 0 is the current function
nseq (SQUnsignedInteger) – the index of the local variable in the stack frame (0 is ‘this’)
- Returns:
the name of the local variable if a variable exists at the given level/seq otherwise NULL.
Returns the name of a local variable given stackframe and sequence in the stack and pushes is current value. Free variables are treated as local variables, by sq_getlocal(), and will be returned as they would be at the base of the stack, just before the real local variables.
-
void sq_reseterror(HSQUIRRELVM v)
- Parameters:
v (HSQUIRRELVM) – the target VM
reset the last error in the virtual machine to null
-
SQRESULT sq_resume(HSQUIRRELVM v, SQBool retval, SQBool raiseerror)
- Parameters:
v (HSQUIRRELVM) – the target VM
retval (SQBool) – if true the function will push the return value in the stack
raiseerror (SQBool) – if true, if a runtime error occurs during the execution of the call, the vm will invoke the error handler.
- Returns:
a SQRESULT
- Remarks:
if retval != 0 the return value of the generator is pushed.
resumes the generator at the top position of the stack.
-
SQRESULT sq_tailcall(HSQUIRRELVM v, SQInteger nparams)
- param HSQUIRRELVM v:
the target VM
- param SQInteger params:
number of parameters of the function
Calls a closure and removes the caller function from the call stack. This function must be invoke from a native closure and he return value of sq_tailcall must be returned by the caller function(see example).
.eg
SQInteger tailcall_something_example(HSQUIRRELVM v)
{
//push closure and parameters here
...
return sq_tailcall(v,2);
}
-
SQRESULT sq_throwerror(HSQUIRRELVM v, const SQChar *err)
- Parameters:
v (HSQUIRRELVM) – the target VM
err (SQChar*) – the description of the error that has to be thrown
- Returns:
the value that has to be returned by a native closure in order to throw an exception in the virtual machine.
sets the last error in the virtual machine and returns the value that has to be returned by a native closure in order to trigger an exception in the virtual machine.
-
SQRESULT sq_throwobject(HSQUIRRELVM v)
- Parameters:
v (HSQUIRRELVM) – the target VM
- Returns:
the value that has to be returned by a native closure in order to throw an exception in the virtual machine.
pops a value from the stack sets it as the last error in the virtual machine. Returns the value that has to be returned by a native closure in order to trigger an exception in the virtual machine (aka SQ_ERROR).