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/*
+----------------------------------------------------------------------+
| Zend Engine, Call Graph |
+----------------------------------------------------------------------+
| Copyright (c) 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: Nikita Popov <nikic@php.net> |
+----------------------------------------------------------------------+
*/
#ifndef _SCDF_H
#define _SCDF_H
#include "zend_bitset.h"
typedef struct _scdf_ctx {
zend_op_array *op_array;
zend_ssa *ssa;
zend_bitset instr_worklist;
/* Represent phi-instructions through the defining var */
zend_bitset phi_var_worklist;
zend_bitset block_worklist;
zend_bitset executable_blocks;
/* 1 bit per edge, see scdf_edge(cfg, from, to) */
zend_bitset feasible_edges;
uint32_t instr_worklist_len;
uint32_t phi_var_worklist_len;
uint32_t block_worklist_len;
struct {
void (*visit_instr)(
struct _scdf_ctx *scdf, zend_op *opline, zend_ssa_op *ssa_op);
void (*visit_phi)(
struct _scdf_ctx *scdf, zend_ssa_phi *phi);
void (*mark_feasible_successors)(
struct _scdf_ctx *scdf, int block_num, zend_basic_block *block,
zend_op *opline, zend_ssa_op *ssa_op);
} handlers;
} scdf_ctx;
void scdf_init(zend_optimizer_ctx *ctx, scdf_ctx *scdf, zend_op_array *op_array, zend_ssa *ssa);
void scdf_solve(scdf_ctx *scdf, const char *name);
int scdf_remove_unreachable_blocks(scdf_ctx *scdf);
/* Add uses to worklist */
static inline void scdf_add_to_worklist(scdf_ctx *scdf, int var_num) {
zend_ssa *ssa = scdf->ssa;
zend_ssa_var *var = &ssa->vars[var_num];
int use;
zend_ssa_phi *phi;
FOREACH_USE(var, use) {
zend_bitset_incl(scdf->instr_worklist, use);
} FOREACH_USE_END();
FOREACH_PHI_USE(var, phi) {
zend_bitset_incl(scdf->phi_var_worklist, phi->ssa_var);
} FOREACH_PHI_USE_END();
}
/* This should usually not be necessary, however it's used for type narrowing. */
static inline void scdf_add_def_to_worklist(scdf_ctx *scdf, int var_num) {
zend_ssa_var *var = &scdf->ssa->vars[var_num];
if (var->definition >= 0) {
zend_bitset_incl(scdf->instr_worklist, var->definition);
} else if (var->definition_phi) {
zend_bitset_incl(scdf->phi_var_worklist, var_num);
}
}
static inline uint32_t scdf_edge(zend_cfg *cfg, int from, int to) {
zend_basic_block *to_block = cfg->blocks + to;
int i;
for (i = 0; i < to_block->predecessors_count; i++) {
uint32_t edge = to_block->predecessor_offset + i;
if (cfg->predecessors[edge] == from) {
return edge;
}
}
ZEND_UNREACHABLE();
}
static inline bool scdf_is_edge_feasible(scdf_ctx *scdf, int from, int to) {
uint32_t edge = scdf_edge(&scdf->ssa->cfg, from, to);
return zend_bitset_in(scdf->feasible_edges, edge);
}
void scdf_mark_edge_feasible(scdf_ctx *scdf, int from, int to);
#endif
|
