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|
/*
+----------------------------------------------------------------------+
| Zend Engine, SSA - Static Single Assignment Form |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2017 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Dmitry Stogov <dmitry@zend.com> |
+----------------------------------------------------------------------+
*/
#ifndef ZEND_SSA_H
#define ZEND_SSA_H
#include "zend_optimizer.h"
#include "zend_cfg.h"
typedef struct _zend_ssa_range {
zend_long min;
zend_long max;
zend_bool underflow;
zend_bool overflow;
} zend_ssa_range;
typedef enum _zend_ssa_negative_lat {
NEG_NONE = 0,
NEG_INIT = 1,
NEG_INVARIANT = 2,
NEG_USE_LT = 3,
NEG_USE_GT = 4,
NEG_UNKNOWN = 5
} zend_ssa_negative_lat;
/* Special kind of SSA Phi function used in eSSA */
typedef struct _zend_ssa_range_constraint {
zend_ssa_range range; /* simple range constraint */
int min_var;
int max_var;
int min_ssa_var; /* ((min_var>0) ? MIN(ssa_var) : 0) + range.min */
int max_ssa_var; /* ((max_var>0) ? MAX(ssa_var) : 0) + range.max */
zend_ssa_negative_lat negative;
} zend_ssa_range_constraint;
typedef struct _zend_ssa_type_constraint {
uint32_t type_mask; /* Type mask to intersect with */
zend_class_entry *ce; /* Class entry for instanceof constraints */
} zend_ssa_type_constraint;
typedef union _zend_ssa_pi_constraint {
zend_ssa_range_constraint range;
zend_ssa_type_constraint type;
} zend_ssa_pi_constraint;
/* SSA Phi - ssa_var = Phi(source0, source1, ...sourceN) */
typedef struct _zend_ssa_phi zend_ssa_phi;
struct _zend_ssa_phi {
zend_ssa_phi *next; /* next Phi in the same BB */
int pi; /* if >= 0 this is actually a e-SSA Pi */
zend_ssa_pi_constraint constraint; /* e-SSA Pi constraint */
int var; /* Original CV, VAR or TMP variable index */
int ssa_var; /* SSA variable index */
int block; /* current BB index */
int visited : 1; /* flag to avoid recursive processing */
int has_range_constraint : 1;
zend_ssa_phi **use_chains;
zend_ssa_phi *sym_use_chain;
int *sources; /* Array of SSA IDs that produce this var.
As many as this block has
predecessors. */
};
typedef struct _zend_ssa_block {
zend_ssa_phi *phis;
} zend_ssa_block;
typedef struct _zend_ssa_op {
int op1_use;
int op2_use;
int result_use;
int op1_def;
int op2_def;
int result_def;
int op1_use_chain;
int op2_use_chain;
int res_use_chain;
} zend_ssa_op;
typedef struct _zend_ssa_var {
int var; /* original var number; op.var for CVs and following numbers for VARs and TMP_VARs */
int scc; /* strongly connected component */
int definition; /* opcode that defines this value */
zend_ssa_phi *definition_phi; /* phi that defines this value */
int use_chain; /* uses of this value, linked through opN_use_chain */
zend_ssa_phi *phi_use_chain; /* uses of this value in Phi, linked through use_chain */
zend_ssa_phi *sym_use_chain; /* uses of this value in Pi constaints */
unsigned int no_val : 1; /* value doesn't mater (used as op1 in ZEND_ASSIGN) */
unsigned int scc_entry : 1;
} zend_ssa_var;
typedef struct _zend_ssa_var_info {
uint32_t type; /* inferred type (see zend_inference.h) */
zend_ssa_range range;
zend_class_entry *ce;
unsigned int has_range : 1;
unsigned int is_instanceof : 1; /* 0 - class == "ce", 1 - may be child of "ce" */
unsigned int recursive : 1;
unsigned int use_as_double : 1;
} zend_ssa_var_info;
typedef struct _zend_ssa {
zend_cfg cfg; /* control flow graph */
int rt_constants; /* run-time or compile-time */
int vars_count; /* number of SSA variables */
zend_ssa_block *blocks; /* array of SSA blocks */
zend_ssa_op *ops; /* array of SSA instructions */
zend_ssa_var *vars; /* use/def chain of SSA variables */
int sccs; /* number of SCCs */
zend_ssa_var_info *var_info;
} zend_ssa;
BEGIN_EXTERN_C()
int zend_build_ssa(zend_arena **arena, const zend_script *script, const zend_op_array *op_array, uint32_t build_flags, zend_ssa *ssa, uint32_t *func_flags);
int zend_ssa_compute_use_def_chains(zend_arena **arena, const zend_op_array *op_array, zend_ssa *ssa);
int zend_ssa_unlink_use_chain(zend_ssa *ssa, int op, int var);
END_EXTERN_C()
static zend_always_inline int zend_ssa_next_use(const zend_ssa_op *ssa_op, int var, int use)
{
ssa_op += use;
if (ssa_op->result_use == var) {
return ssa_op->res_use_chain;
}
return (ssa_op->op1_use == var) ? ssa_op->op1_use_chain : ssa_op->op2_use_chain;
}
static zend_always_inline zend_ssa_phi* zend_ssa_next_use_phi(const zend_ssa *ssa, int var, const zend_ssa_phi *p)
{
if (p->pi >= 0) {
return p->use_chains[0];
} else {
int j;
for (j = 0; j < ssa->cfg.blocks[p->block].predecessors_count; j++) {
if (p->sources[j] == var) {
return p->use_chains[j];
}
}
}
return NULL;
}
#endif /* ZEND_SSA_H */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/
|
