/**************************************************************************** ** ** This file is part of GAP, a system for computational discrete algebra. ** ** Copyright of GAP belongs to its developers, whose names are too numerous ** to list here. Please refer to the COPYRIGHT file for details. ** ** SPDX-License-Identifier: GPL-2.0-or-later
*/
//// LibGAP API - API for using GAP as shared library.
// Code which uses the GAP API and/or which keeps references to any GAP // objects in local variables must be bracketed by uses of GAP_EnterStack() // and GAP_LeaveStack(), in particular when using the GASMAN garbage // collector; otherwise GAP objects may be garbage collected while still in // use. // // In general user code should use the more general GAP_Enter()/Leave() // macros defined below, as these also specify a terminal point for unhandled // GAP errors to bubble up to. However, GAP_EnterStack() and // GAP_LeaveStack() should still be used in the definition of a custom error // handling callback as passed to GAP_Initialize(). Using the more general // GAP_Enter() in this case will result in crashes if the error handler is // entered recursively (you don't want the GAP error handling code to cause a // longjmp into the error callback itself since then the error callback will // never be returned from). #ifdef __GNUC__ #define GAP_EnterStack() \ do { \
GAP_ENTER_DEBUG_MESSAGE("EnterStack", __FILE__, __LINE__); \
GAP_EnterStack_(__builtin_frame_address(0)); \
} while (0) #elifdefined(USE_GASMAN) #error GASMAN requires a way to get the current stack frame base address \ for the GAP_EnterStack() macro; normally this uses the \
__builtin_frame_address GNU extension so ifthis is not available \
it is necessary to provide your own implementation here. #else // If we're not using GASMAN in the first place GAP_EnterStack_() is not // strictly needed, and can just be called with a dummy value #define GAP_EnterStack() \ do { \
GAP_ENTER_DEBUG_MESSAGE("EnterStack", __FILE__, __LINE__); \
GAP_EnterStack_(0); \
} while (0) #endif
// Code which uses the GAP API exposed by this header file should sandwich // any such calls between uses of the GAP_Enter() and GAP_Leave() macro as // follows: // // int ok = GAP_Enter(); // if (ok) { // ... // any number of calls to GAP APIs // } // GAP_Leave(); // // This is in particular crucial if your code keeps references to any GAP // functions in local variables: Calling GAP_Enter() ensures that GAP is // aware of such references, and will not garbage collect the referenced // objects. Failing to use these macros properly can lead to crashes, or // worse, silent memory corruption. You have been warned! // // Note that due to the implementation of these macros, you unfortunately // cannot "simplify" the above example code to: // // if (GAP_Enter()) { ... } GAP_Leave(); // // Some notes on the implementation: // // GAP_Enter() is a combination of GAP_Error_Setjmp() and GAP_EnterStack(). // It must call GAP_Error_Setjmp() first, to ensure that writing // ``int ok = GAP_Enter();'' works as intended (the value assigned to ok then // is the return value of GAP_Error_Setjmp). // // * GAP_EnterStack() defined and explained above must be a macro since it // needs to figure out (to the extent possible) the base address of the // stack frame from which it is called. // // * GAP_Error_Setjmp() effectively calls setjmp to the STATE(ReadJmpError) // longjmp buffer, so that read errors which occur in GAP that are not // otherwise "handled" by a GAP_TRY { } block have a logical place // to return to. It returns 1 if no error occurred, and 0 if returning // from an error. #define GAP_Enter() \
GAP_Error_Setjmp(); \
GAP_EnterStack()
#define GAP_Leave() GAP_LeaveStack()
//// //// Setup and initialisation ////
typedefvoid (*GAP_CallbackFunc)(void);
// TODO: document this function void GAP_Initialize(int argc, char ** argv,
GAP_CallbackFunc markBagsCallback,
GAP_CallbackFunc errorCallback, int handleSignals);
//// //// Garbage collector ////
// Manual management of the GAP garbage collector: for cases where you want // a GAP object to be long-lived beyond the context of the stack frame where // it was created, it is necessary to call GAP_MarkBag on the object when // the garbage collector is run by the markBagsCallback function passed to // GAP_Initialize. void GAP_MarkBag(Obj obj);
// Manually run the garbage collector. // A <full> collection checks all previously allocated objects, including those // that have survived at least one previous garbage collection. // A partial collection will attempt to clean up only recently allocated // objects which have not been garbage-collected yet, and is hence normally // a faster operation. void GAP_CollectBags(BOOL full);
//// //// program evaluation and execution ////
// GAP_EvalString attempts to execute all statements read from the string // <cmd> as if they occurred in a GAP source file that is read by the GAP // command `Read`. However, no break loops are triggered. If evaluation a // statement leads to an error, the next statement is executed, and so on. // // It returns a list of lists, each entry of which reflects the result of the // execution of one statement. Specifically, each entry is another list, each // having length at most five, with the entries having the following meaning: // // - The first entry is 'true' if the statement was executed successfully, // and 'false' otherwise. // // - If the first entry is 'true', then the second entry is bound to the // result of the statement if there was one, and unbound otherwise. // // - The third entry is 'true' if the statement ended in a dual semicolon, // and 'false' otherwise. // // - The fourth entry currently is always unbound. // // - The fifth entry contains the captured output of the statement as a // string, as well as the output of 'ViewObj' applied to the result value // in second entry, if any (but only if there was no dual semicolon). // // This function is currently used in interactive tools such as the GAP // Jupyter kernel to execute cells and is likely to be replaced by a function // that can read a single command from a stream without losing the rest of // its content. // // To see an example of how to use this function see tst/testlibgap/basic.c
Obj GAP_EvalString(constchar * cmd);
//// //// variables ////
// Returns the value of the global GAP variable with name <name>, or NULL if // no global variable with this name is defined.
Obj GAP_ValueGlobalVariable(constchar * name);
// Checks if assigning to the global GAP variable <name> is possible, by // verifying that <name> is not the name of a read-only or constant variable. int GAP_CanAssignGlobalVariable(constchar * name);
// Assign <value> to the global GAP variable <name>. If <name> is the name of // a readonly or constant variable, an error is raised. void GAP_AssignGlobalVariable(constchar * name, Obj value);
//// //// arithmetic ////
// Returns a nonzero value if the object <a> is equal to the object <b>, and // zero otherwise. int GAP_EQ(Obj a, Obj b);
// Returns a nonzero value if the object <a> is less than the object <b>, and // zero otherwise. int GAP_LT(Obj a, Obj b);
// Returns a nonzero value if the object <a> is a member of the object <b>, // and zero otherwise. int GAP_IN(Obj a, Obj b);
// Returns the sum of the two objects <a> and <b>.
Obj GAP_SUM(Obj a, Obj b);
// Returns the difference of the two objects <a> and <b>.
Obj GAP_DIFF(Obj a, Obj b);
// Returns the product of the two objects <a> and <b>.
Obj GAP_PROD(Obj a, Obj b);
// Returns the quotient of the object <a> by the object <b>.
Obj GAP_QUO(Obj a, Obj b);
// Returns the left quotient of the object <a> by the object <b>.
Obj GAP_LQUO(Obj a, Obj b);
// Returns the power of the object <a> by the object <a>.
Obj GAP_POW(Obj a, Obj b);
// Returns the commutator of the two objects <a> and <b>.
Obj GAP_COMM(Obj a, Obj b);
// Returns the remainder of the object <a> by the object <b>.
Obj GAP_MOD(Obj a, Obj b);
//// //// booleans ////
// Returns 1 if <obj> is a GAP boolean, 0 if not. // // Never raises an error. Safe to be called with a NULL pointer. int GAP_IsBoolean(Obj obj);
// Returns 1 if <obj> is a GAP function, 0 if not. // // Never raises an error. Safe to be called with a NULL pointer. int GAP_IsFunction(Obj obj);
// Call the GAP object <func> as a function with arguments given // as a GAP list <args>.
Obj GAP_CallFuncList(Obj func, Obj args);
// Call the GAP object <func> as a function with arguments given // as an array <args> with <narg> entries.
Obj GAP_CallFuncArray(Obj func, UInt narg, Obj args[]);
// Call the GAP object <func> as a function with 0 arguments.
Obj GAP_CallFunc0Args(Obj func);
// Call the GAP object <func> as a function with 1 argument.
Obj GAP_CallFunc1Args(Obj func, Obj a1);
// Call the GAP object <func> as a function with 2 arguments.
Obj GAP_CallFunc2Args(Obj func, Obj a1, Obj a2);
// Call the GAP object <func> as a function with 3 arguments.
Obj GAP_CallFunc3Args(Obj func, Obj a1, Obj a2, Obj a3);
//// //// floats ////
// Returns 1 if <obj> is a GAP machine float, 0 if not. // // Never raises an error. Safe to be called with a NULL pointer. int GAP_IsMacFloat(Obj obj);
// Returns the value of the GAP machine float object <obj>. // If <obj> is not a machine float object, an error is raised. double GAP_ValueMacFloat(Obj obj);
// Returns a new GAP machine float with value <x>.
Obj GAP_NewMacFloat(double x);
//// //// integers ////
// Returns 1 if <obj> is a GAP integer, 0 if not. // // Never raises an error. Safe to be called with a NULL pointer. int GAP_IsInt(Obj obj);
// Returns 1 if <obj> is a GAP small (aka immediate) integer, 0 if not. // // Never raises an error. Safe to be called with a NULL pointer. int GAP_IsSmallInt(Obj obj);
// Returns 1 if <obj> is a GAP large integer, 0 if not. // // Never raises an error. Safe to be called with a NULL pointer. int GAP_IsLargeInt(Obj obj);
// Construct a GAP integer object from the limbs at which <limbs> points (for // a definition of "limbs", please consult the comment at the top of // `integer.c`). The absolute value of <size> determines the number of limbs. // If <size> is zero, then `INTOBJ_INT(0)` is returned. Otherwise, the sign // of the returned integer object is determined by the sign of <size>. // // Note that GAP automatically reduces and normalized the integer object, // i.e., it will discard any leading zeros; and if the integer fits into a // small integer, it will be returned as such.
Obj GAP_MakeObjInt(const UInt * limbs, Int size);
// Return a GAP integer object with value equal to <val>. // // Never raises an error.
Obj GAP_NewObjIntFromInt(Int val);
// Return an integer equal to the given GAP integer object. If <obj> is not // a GAP integer, or does not fit into an Int, an error is raised. // // If `GAP_IsSmallInt(obj)` return 1, then it is guaranteed that this will // succeed and no error is raised. Int GAP_ValueInt(Obj);
// If <obj> is a GAP integer, returns the number of limbs needed to store the // integer, times the sign. If <obj> is the integer 0, then 0 is returned. If // <obj> is any other small integer, then 1 or -1 is returned, depending on // its sign. // // If <obj> is not a GAP integer, an error is raised. Int GAP_SizeInt(Obj obj);
// Returns a pointer to the limbs of a the GAP large integer <obj>. // If <obj> is not a GAP large integer, then NULL is returned. // // Note: The pointer returned by this function is only valid until the next // GAP garbage collection. In particular, if you use any GAP APIs, then you // should assume that the pointer became stale. Barring that, you may safely // copy, inspect, or even modify the content of the string buffer. const UInt * GAP_AddrInt(Obj obj);
//// //// lists ////
// Returns 1 if <obj> is a GAP list, 0 if not. // // Never raises an error. Safe to be called with a NULL pointer. int GAP_IsList(Obj obj);
// Returns the length of the given GAP list. // If <list> is not a GAP list, an error may be raised.
UInt GAP_LenList(Obj list);
// Assign <val> at position <pos> into the GAP list <list>. // If <val> is zero, then this unbinds the list entry. // If <list> is not a GAP list, an error may be raised. void GAP_AssList(Obj list, UInt pos, Obj val);
// Returns the element at the position <pos> in the GAP list <list>. // Returns 0 if there is no entry at the given position. // Also returns 0 if <pos> is out of bounds, i.e., if <pos> is zero, // or larger than the length of the list. // If <list> is not a GAP list, an error may be raised.
Obj GAP_ElmList(Obj list, UInt pos);
// Returns a new empty plain list with capacity <capacity>
Obj GAP_NewPlist(Int capacity);
// Returns a new range with <len> elements, starting at <low>, and proceeding // in increments of <inc>. So the final element in the range will be equal to // <high> := <low> + <inc> * (<len> - 1). // // Note that <inc> must be non-zero, and all three arguments as // well as the value <high> must fit into a GAP small integer. // If any of these conditions is violated, then GAP_Fail is returned.
Obj GAP_NewRange(Int len, Int low, Int inc);
//// //// matrix obj ////
// Note that the meaning of the following filters is not self-explanatory, // see the chapter "Vector and Matrix Objects" in the GAP Reference Manual. // `GAP_IsMatrixOrMatrixObj` checks whether the argument is an abstract // 2-dim. array; such objects admit access to entries via `GAP_ElmMat`, // one can ask for the numbers of rows and columns via `GAP_NrRows` and // `GAP_NrCols`, respectively, etc. // `GAP_IsMatrix` checks for special cases that are nonempty list of lists // with additional properties; often these are plain lists. // `GAP_IsMatrixObj` checks for special cases that are not plain lists.
// Returns 1 if <obj> is a GAP matrix or matrix obj, 0 if not. // // Never raises an error. Safe to be called with a NULL pointer. int GAP_IsMatrixOrMatrixObj(Obj obj);
// Returns 1 if <obj> is a GAP matrix, 0 if not. // // Never raises an error. Safe to be called with a NULL pointer. int GAP_IsMatrix(Obj obj);
// Returns 1 if <obj> is a GAP matrix obj, 0 if not. // // Never raises an error. Safe to be called with a NULL pointer. int GAP_IsMatrixObj(Obj obj);
// Returns the number of rows of the given GAP matrix or matrix obj. // If <mat> is not a GAP matrix or matrix obj, an error may be raised.
UInt GAP_NrRows(Obj mat);
// Returns the number of columns of the given GAP matrix or matrix obj. // If <mat> is not a GAP matrix or matrix obj, an error may be raised.
UInt GAP_NrCols(Obj mat);
// Assign <val> at position <pos> into the GAP matrix obj <mat>. // If <val> is zero, then this unbinds the list entry. // If <mat> is not a GAP matrix obj, an error may be raised. void GAP_AssMat(Obj mat, UInt row, UInt col, Obj val);
// Returns the element at the <row>, <col> in the GAP matrix obj <mat>. // Returns 0 if <row> or <col> are out of bounds, i.e., if either // is zero, or larger than the number of rows respectively columns of the list. // If <mat> is not a GAP matrix obj, an error may be raised.
Obj GAP_ElmMat(Obj mat, UInt row, UInt col);
//// //// records ////
// Returns 1 if <obj> is a GAP record, 0 if not. // // Never raises an error. Safe to be called with a NULL pointer. int GAP_IsRecord(Obj obj);
// Assign <val> to component given by <name> in the GAP record <rec>. // If <val> is zero, then this unbinds the record entry. // If <record> is not a GAP record, an error may be raised. void GAP_AssRecord(Obj rec, Obj name, Obj val);
// Returns the component given by <name> in the GAP record <rec>. // Returns 0 if there is no entry of the given name. // If <rec> is not a GAP record, an error may be raised.
Obj GAP_ElmRecord(Obj rec, Obj name);
// Returns a new empty plain record with capacity <capacity>.
Obj GAP_NewPrecord(Int capacity);
//// //// strings ////
// Returns 1 if <obj> is a GAP string, 0 if not. // // Never raises an error. Safe to be called with a NULL pointer. int GAP_IsString(Obj obj);
// Returns the length of the given GAP string. // If <string> is not a GAP string, an error may be raised.
UInt GAP_LenString(Obj string);
// Returns a pointer to the contents of the GAP string <string>. // Returns 0 if <string> is not a GAP string. // // Note: GAP strings may contain null bytes, so to copy the full string, you // should use `GAP_LenString` to determine its length. GAP always adds an // additional terminating null byte. // // Note: The pointer returned by this function is only valid until the next // GAP garbage collection. In particular, if you use any GAP APIs, then you // should assume that the pointer became stale. Barring that, you may safely // copy, inspect, or even modify the content of the string buffer. // // Usage example: // Int len = GAP_LenString(string); // char *buf = malloc(len + 1); // memcpy(buf, GAP_CSTR_STRING(string), len + 1); // copy terminator, too // // .. now we can safely use the content of buf char * GAP_CSTR_STRING(Obj obj);
// Returns a new mutable GAP string containing a copy of the given NULL // terminated C string.
Obj GAP_MakeString(constchar * string);
// Returns a new mutable GAP string containing a copy of the given // C string of given length (in bytes).
Obj GAP_MakeStringWithLen(constchar * string, UInt len);
// Returns a immutable GAP string containing a copy of the given NULL // terminated C string.
Obj GAP_MakeImmString(constchar * string);
//// //// chars ////
// Returns 1 if <obj> is a GAP char, 0 if not. // // Never raises an error. Safe to be called with a NULL pointer. int GAP_IsChar(Obj obj);
// Returns the value of the GAP character object <obj>. // If <obj> is not a GAP character object, it returns -1. // // Never raises an error. Int GAP_ValueOfChar(Obj obj);
// Returns the GAP character object with value <obj>. // // Never raises an error.
Obj GAP_CharWithValue(UChar obj);
#ifdef __cplusplus
} #endif
#endif
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