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More accurate "vararg" handling in DCE

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This commit is contained in:
Dmitry Stogov 2017-07-13 11:51:14 +03:00
parent 665ed8491c
commit 94c9b26695
3 changed files with 25 additions and 5 deletions
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23
ext/opcache/Optimizer/dce.c
View File

@ -457,14 +457,29 @@ static void try_remove_trivial_phi(context *ctx, zend_ssa_phi *phi) {
}
}
static inline zend_bool may_break_varargs(const zend_op_array *op_array, const zend_ssa *ssa, const zend_ssa_op *ssa_op) {
if (ssa_op->op1_def >= 0
&& ssa->vars[ssa_op->op1_def].var < op_array->num_args) {
return 1;
}
if (ssa_op->op2_def >= 0
&& ssa->vars[ssa_op->op2_def].var < op_array->num_args) {
return 1;
}
if (ssa_op->result_def >= 0
&& ssa->vars[ssa_op->result_def].var < op_array->num_args) {
return 1;
}
return 0;
}
int dce_optimize_op_array(zend_op_array *op_array, zend_ssa *ssa, zend_bool reorder_dtor_effects) {
int i;
zend_ssa_phi *phi;
int removed_ops = 0;
/* DCE of CV operations may affect vararg functions. For now simply treat all instructions
* as live if varargs in use and only collect dead phis. */
zend_bool has_varargs = (ZEND_FUNC_INFO(op_array)->flags & ZEND_FUNC_VARARG) != 0;
/* DCE of CV operations that changes arguments may affect vararg functions. */
zend_bool has_varargs = ssa->cfg.vararg;
context ctx;
ctx.ssa = ssa;
@ -504,7 +519,7 @@ int dce_optimize_op_array(zend_op_array *op_array, zend_ssa *ssa, zend_bool reor
add_operands_to_worklists(&ctx, &op_array->opcodes[i], &ssa->ops[i], 0);
} else if (may_have_side_effects(op_array, ssa, &op_array->opcodes[i], &ssa->ops[i], ctx.reorder_dtor_effects)
|| zend_may_throw(&op_array->opcodes[i], op_array, ssa)
|| has_varargs) {
|| (has_varargs && may_break_varargs(op_array, ssa, &ssa->ops[i]))) {
add_operands_to_worklists(&ctx, &op_array->opcodes[i], &ssa->ops[i], 0);
} else {
zend_bitset_incl(ctx.instr_dead, i);

6
ext/opcache/Optimizer/zend_cfg.c
View File

@ -441,6 +441,9 @@ int zend_build_cfg(zend_arena **arena, const zend_op_array *op_array, uint32_t b
flags |= ZEND_FUNC_INDIRECT_VAR_ACCESS;
}
break;
case ZEND_FUNC_GET_ARGS:
flags |= ZEND_FUNC_VARARG;
break;
}
}
@ -598,7 +601,8 @@ int zend_build_cfg(zend_arena **arena, const zend_op_array *op_array, uint32_t b
/* Build CFG, Step 4, Mark Reachable Basic Blocks */
zend_mark_reachable_blocks(op_array, cfg, 0);
cfg->dynamic = (flags & ZEND_FUNC_INDIRECT_VAR_ACCESS);
cfg->dynamic = (flags & ZEND_FUNC_INDIRECT_VAR_ACCESS) != 0;
cfg->vararg = (flags & ZEND_FUNC_VARARG) != 0;
if (func_flags) {
*func_flags |= flags;

1
ext/opcache/Optimizer/zend_cfg.h
View File

@ -93,6 +93,7 @@ typedef struct _zend_cfg {
unsigned int split_at_calls : 1;
unsigned int split_at_recv : 1;
unsigned int dynamic : 1; /* accesses varables by name */
unsigned int vararg : 1; /* uses func_get_args() */
} zend_cfg;
/* Build Flags */