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https://git.code.sf.net/p/quake/quakeforge
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70af362562
In working with vectors and matrices while testing the scene wrappers, I found that there was a fair bit of confusion about how large something could be. Return values can be up to 32 words (but qfcc wasn't aware of that), parameters were limited to 4 words still (and possibly should be for varargs), and temp defs were limited to 8 words (1 lvec4). Temps are used for handling return values (at least when not optimizing) and thus must be capable of holding a return value, and passing large arguments through *formal* parameters should be allowed. It seems reasonable to limit parameter sizes to return value sizes. A temp and a move are still used for large return values (4x4 matrix), but that's an optimization issue: the code itself is at least correct.
179 lines
6.5 KiB
C
179 lines
6.5 KiB
C
/*
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function.h
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QC function support code
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Copyright (C) 2002 Bill Currie <bill@taniwha.org>
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Author: Bill Currie <bill@taniwha.org>
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Date: 2002/05/08
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifndef __function_h
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#define __function_h
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/** \defgroup qfcc_function Internal function structures.
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\ingroup qfcc
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*/
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///@{
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#include "QF/progs/pr_comp.h"
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#include "QF/progs/pr_debug.h"
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#include "def.h"
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// The maximum size of a temp def, return value, or parameter value
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#define MAX_DEF_SIZE 32
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/** Represent an overloading of a function.
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Every function, whether overloaded or not, has an entry in the overloaded
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function database.
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*/
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typedef struct overloaded_function_s {
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struct overloaded_function_s *next;
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const char *name; ///< source level name of function
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const char *full_name; ///< progs name of function, with type
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///< encoding
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const struct type_s *type; ///< type of this function
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int overloaded; ///< is this function overloaded
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pr_string_t file; ///< source file of the function
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int line; ///< source line of this function
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} overloaded_function_t;
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/** Internal representation of a function.
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*/
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typedef struct function_s {
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struct function_s *next;
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int builtin; ///< if non 0, call an internal function
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int code; ///< first statement
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int function_num;
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int line_info;
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int params_start;///< relative to locals space. 0 for v6p
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pr_string_t s_file; ///< source file with definition
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pr_string_t s_name; ///< name of function in output
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const struct type_s *type; ///< function's type without aliases
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int temp_reg; ///< base register to use for temp defs
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int temp_num; ///< number for next temp var
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struct def_s *temp_defs[MAX_DEF_SIZE];///< freed temp vars (by size)
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struct def_s *def; ///< output def holding function number
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struct symbol_s *sym; ///< internal symbol for this function
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/** \name Local data space
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The function parameters form the root scope for the function. Its
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defspace is separate from the locals defspace so that it can be moved
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to the beginning of locals space for v6 progs, and too the end (just
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above the stack pointer on entry to the function) for Ruamoko progs.
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The locals scope is a direct child of the parameters scope, and any
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sub-scope symbol tables are not directly accessible, but all defs
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other than function call arugments created in the function's local
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data space are recorded in the root local scope symbol table's
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defspace.
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The arguments defspace is not used for v6 progs. It is used as a
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highwater allocator for the arguments to all calls made by the
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funciton, with the arguments to separate functions overlapping each
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other.
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Afther the function has been emitted, locals, arguments and possibly
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parameters will be merged into the one defspace.
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*/
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///@{
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struct symtab_s *parameters; ///< Root scope symbol table
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struct symtab_s *locals; ///< Actual local variables
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struct defspace_s *arguments; ///< Space for called function arguments
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///@}
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struct symtab_s *label_scope;
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struct reloc_s *refs; ///< relocation targets for this function
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struct expr_s *var_init;
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const char *name; ///< nice name for __PRETTY_FUNCTION__
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struct sblock_s *sblock; ///< initial node of function's code
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struct flowgraph_s *graph; ///< the function's flow graph
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/** Array of pointers to all variables referenced by the function's code.
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This permits ready mapping of (function specific) variable number to
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variable in the flow analyzer.
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*/
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struct flowvar_s **vars;
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int num_vars; ///< total number of variables referenced
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struct set_s *global_vars;///< set indicating which vars are global
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struct statement_s **statements;
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int num_statements;
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int pseudo_addr;///< pseudo address space for flow analysis
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struct pseudoop_s *pseudo_ops;///< pseudo operands used by this function
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} function_t;
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extern function_t *current_func;
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/** Representation of a function parameter.
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\note The first two fields match the first two fields of keywordarg_t
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in method.h
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*/
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typedef struct param_s {
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struct param_s *next;
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const char *selector;
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struct type_s *type;
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const char *name;
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struct symbol_s *symbol; //FIXME what is this for?
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} param_t;
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struct expr_s;
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struct symbol_s;
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struct symtab_s;
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param_t *new_param (const char *selector, struct type_s *type,
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const char *name);
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param_t *param_append_identifiers (param_t *params, struct symbol_s *idents,
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struct type_s *type);
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param_t *reverse_params (param_t *params);
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param_t *append_params (param_t *params, param_t *more_params);
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param_t *copy_params (param_t *params);
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struct type_s *parse_params (struct type_s *type, param_t *params);
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param_t *check_params (param_t *params);
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enum storage_class_e;
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struct defspace_s;
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int value_too_large (struct type_s *val_type) __attribute__((const));
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void make_function (struct symbol_s *sym, const char *nice_name,
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struct defspace_s *space, enum storage_class_e storage);
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struct symbol_s *function_symbol (struct symbol_s *sym,
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int overload, int create);
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struct expr_s *find_function (struct expr_s *fexpr, struct expr_s *params);
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function_t *new_function (const char *name, const char *nice_name);
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void add_function (function_t *f);
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function_t *begin_function (struct symbol_s *sym, const char *nicename,
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struct symtab_s *parent, int far,
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enum storage_class_e storage);
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function_t *build_code_function (struct symbol_s *fsym,
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struct expr_s *state_expr,
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struct expr_s *statements);
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function_t *build_builtin_function (struct symbol_s *sym,
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struct expr_s *bi_val, int far,
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enum storage_class_e storage);
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void emit_function (function_t *f, struct expr_s *e);
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int function_parms (function_t *f, byte *parm_size);
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void clear_functions (void);
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///@}
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#endif//__function_h
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