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https://git.code.sf.net/p/quake/quakeforge
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1985b6d4fd
This fixed the uninitialized temp warning in HUD.r. The problem was caused by the flow analyzer not being able to detect that the struct temp was being initialized by the move statement due to the address of the temp being in a pointer temp. While it would be good to use a constant pointer for the address of the struct temp or improving the flow analyzer to track actual data, avoiding the temp in the first place results in nicer code as it removes a move statement.
149 lines
4.6 KiB
C
149 lines
4.6 KiB
C
/*
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statement.h
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Internal statements
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Copyright (C) 2011 Bill Currie <bill@taniwha.org>
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Author: Bill Currie <bill@taniwha.org>
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Date: 2011/01/18
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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 statement_h
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#define statement_h
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#include "QF/pr_comp.h"
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typedef enum {
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op_def,
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op_value,
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op_label,
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op_temp,
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op_alias,
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} op_type_e;
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typedef struct {
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struct def_s *def;
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int offset;
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struct type_s *type;
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struct flowvar_s *flowvar;
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struct daglabel_s *daglabel;
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struct operand_s *alias;
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struct operand_s *alias_ops;
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int users;
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int flowaddr; ///< "address" of temp in flow analysis, != 0
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} tempop_t;
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typedef struct operand_s {
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struct operand_s *next;
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op_type_e op_type;
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struct type_s *type; ///< possibly override def's type
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int size; ///< for structures
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union {
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struct def_s *def;
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struct ex_value_s *value;
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struct ex_label_s *label;
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tempop_t tempop;
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struct operand_s *alias;
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} o;
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} operand_t;
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/** Overall type of statement.
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Statement types are broken down into expressions (binary and unary,
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includes address and pointer dereferencing (read)), assignment, pointer
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assignment (write to dereference pointer), move (special case of pointer
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assignment), state, function related (call, rcall, return and done), and
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flow control (conditional branches, goto, jump (single pointer and jump
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table)).
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*/
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typedef enum {
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st_none, ///< not a (valid) statement. Used in dags.
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st_expr, ///< c = a op b; or c = op a;
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st_assign, ///< b = a
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st_ptrassign, ///< *b = a; or *(b + c) = a;
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st_move, ///< memcpy (c, a, b);
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st_state, ///< state (a, b); or state (a, b, c)
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st_func, ///< call, rcall or return/done
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st_flow, ///< if/ifa/ifae/ifb/ifbe/ifnot or goto or jump/jumpb
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} st_type_t;
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typedef struct statement_s {
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struct statement_s *next;
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st_type_t type;
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const char *opcode;
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operand_t *opa;
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operand_t *opb;
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operand_t *opc;
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struct expr_s *expr; ///< source expression for this statement
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int number; ///< number of this statement in function
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} statement_t;
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typedef struct sblock_s {
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struct sblock_s *next;
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struct reloc_s *relocs;
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struct ex_label_s *labels;
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struct flownode_s *flownode;///< flow node for this block
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int offset; ///< offset of first statement of block
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int reachable;
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int number; ///< number of this block in flow graph
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statement_t *statements;
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statement_t **tail;
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} sblock_t;
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struct expr_s;
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struct type_s;
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struct dstring_s;
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const char *optype_str (op_type_e type) __attribute__((const));
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operand_t *def_operand (struct def_s *def, struct type_s *type);
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operand_t *return_operand (struct type_s *type);
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operand_t *value_operand (struct ex_value_s *value);
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int tempop_overlap (tempop_t *t1, tempop_t *t2) __attribute__((pure));
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operand_t *temp_operand (struct type_s *type);
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int tempop_visit_all (tempop_t *tempop, int overlap,
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int (*visit) (tempop_t *, void *), void *data);
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operand_t *alias_operand (struct type_s *type, operand_t *op);
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void free_operand (operand_t *op);
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sblock_t *new_sblock (void);
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statement_t *new_statement (st_type_t type, const char *opcode,
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struct expr_s *expr);
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int statement_is_cond (statement_t *s) __attribute__((pure));
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int statement_is_goto (statement_t *s) __attribute__((pure));
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int statement_is_jumpb (statement_t *s) __attribute__((pure));
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int statement_is_call (statement_t *s) __attribute__((pure));
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int statement_is_return (statement_t *s) __attribute__((pure));
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sblock_t *statement_get_target (statement_t *s) __attribute__((pure));
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sblock_t **statement_get_targetlist (statement_t *s);
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void sblock_add_statement (sblock_t *sblock, statement_t *statement);
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sblock_t *make_statements (struct expr_s *expr);
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void statements_count_temps (sblock_t *sblock);
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void print_operand (operand_t *op);
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void print_statement (statement_t *s);
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void dump_dot_sblock (void *data, const char *fname);
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void dot_sblock (struct dstring_s *dstr, sblock_t *sblock, int blockno);
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void print_sblock (sblock_t *sblock, const char *filename);
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const char *operand_string (operand_t *op);
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#endif//statement_h
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