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0a5101f88c
While all base registers can be used for any purpose at any time (this is why the with instruction has hard-absolute modes: you can never get permanently lost), qfcc currently uses the convention of register 0 for globals and register 1 for stack locals (params, locals, function args). The register used to access a def is stored in the def and that is used to set the register bits in the instruction opcode. The def code actually doesn't know anything about any conventions: it assumes all defs are global for non-temp defs (the function code updates the defs before emitting code) and the current function provides the register to use for any temp defs allocated while emitting code. Seems to work well, but debug is utterly messed up (not surprised, that will be tricky).
175 lines
6.3 KiB
C
175 lines
6.3 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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/** 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 local_defs;
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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[4]; ///< 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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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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