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https://git.code.sf.net/p/quake/quakeforge
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554b2e4710
It doesn't quite work yet, but... It has proven necessary to know what type .return has at any point in the function. The segfault in ctf is caused by the return statement added to the end of the void function messing with the expr pointer stored in the daglabel for .return. While this is actually by design (though the statement really should have a valid expr pointer rather than), it actually highlights a bigger problem: there's no stable knowledge of the current type of .return. This is not a problem in expression statements as the dagnodes for expression statements store the desired types of all operands. However, when assigning from .return to attached variables in a leaf node, the type of .return is not stored anywhere but the expression last accessing .return.
129 lines
3.7 KiB
C
129 lines
3.7 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_symbol,
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op_value,
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op_label,
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op_temp,
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op_pointer,
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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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struct flowvar_s *flowvar;
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struct daglabel_s *daglabel;
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int users;
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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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etype_t type; ///< possibly override symbol's type
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int size; ///< for structures
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union {
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struct symbol_s *symbol;
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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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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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operand_t *alias_operand (operand_t *op, etype_t type);
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operand_t *temp_operand (struct type_s *type);
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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);
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int statement_is_goto (statement_t *s);
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int statement_is_jumpb (statement_t *s);
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int statement_is_call (statement_t *s);
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int statement_is_return (statement_t *s);
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sblock_t *statement_get_target (statement_t *s);
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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 print_statement (statement_t *s);
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void dump_dot_sblock (void *data, const char *fname);
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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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