URL
https://opencores.org/ocsvn/openrisc/openrisc/trunk
Subversion Repositories openrisc
[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [gcc/] [tree-stdarg.c] - Rev 841
Go to most recent revision | Compare with Previous | Blame | View Log
/* Pass computing data for optimizing stdarg functions. Copyright (C) 2004, 2005, 2007 Free Software Foundation, Inc. Contributed by Jakub Jelinek <jakub@redhat.com> This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see <http://www.gnu.org/licenses/>. */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "tree.h" #include "function.h" #include "langhooks.h" #include "diagnostic.h" #include "target.h" #include "tree-flow.h" #include "tree-pass.h" #include "tree-stdarg.h" /* A simple pass that attempts to optimize stdarg functions on architectures that need to save register arguments to stack on entry to stdarg functions. If the function doesn't use any va_start macros, no registers need to be saved. If va_start macros are used, the va_list variables don't escape the function, it is only necessary to save registers that will be used in va_arg macros. E.g. if va_arg is only used with integral types in the function, floating point registers don't need to be saved, etc. */ /* Return true if basic block VA_ARG_BB is dominated by VA_START_BB and is executed at most as many times as VA_START_BB. */ static bool reachable_at_most_once (basic_block va_arg_bb, basic_block va_start_bb) { edge *stack, e; edge_iterator ei; int sp; sbitmap visited; bool ret; if (va_arg_bb == va_start_bb) return true; if (! dominated_by_p (CDI_DOMINATORS, va_arg_bb, va_start_bb)) return false; stack = XNEWVEC (edge, n_basic_blocks + 1); sp = 0; visited = sbitmap_alloc (last_basic_block); sbitmap_zero (visited); ret = true; FOR_EACH_EDGE (e, ei, va_arg_bb->preds) stack[sp++] = e; while (sp) { basic_block src; --sp; e = stack[sp]; src = e->src; if (e->flags & EDGE_COMPLEX) { ret = false; break; } if (src == va_start_bb) continue; /* va_arg_bb can be executed more times than va_start_bb. */ if (src == va_arg_bb) { ret = false; break; } gcc_assert (src != ENTRY_BLOCK_PTR); if (! TEST_BIT (visited, src->index)) { SET_BIT (visited, src->index); FOR_EACH_EDGE (e, ei, src->preds) stack[sp++] = e; } } free (stack); sbitmap_free (visited); return ret; } /* For statement COUNTER = RHS, if RHS is COUNTER + constant, return constant, otherwise return (unsigned HOST_WIDE_INT) -1. GPR_P is true if this is GPR counter. */ static unsigned HOST_WIDE_INT va_list_counter_bump (struct stdarg_info *si, tree counter, tree rhs, bool gpr_p) { tree stmt, lhs, orig_lhs; unsigned HOST_WIDE_INT ret = 0, val, counter_val; unsigned int max_size; if (si->offsets == NULL) { unsigned int i; si->offsets = XNEWVEC (int, num_ssa_names); for (i = 0; i < num_ssa_names; ++i) si->offsets[i] = -1; } counter_val = gpr_p ? cfun->va_list_gpr_size : cfun->va_list_fpr_size; max_size = gpr_p ? VA_LIST_MAX_GPR_SIZE : VA_LIST_MAX_FPR_SIZE; orig_lhs = lhs = rhs; while (lhs) { if (si->offsets[SSA_NAME_VERSION (lhs)] != -1) { if (counter_val >= max_size) { ret = max_size; break; } ret -= counter_val - si->offsets[SSA_NAME_VERSION (lhs)]; break; } stmt = SSA_NAME_DEF_STMT (lhs); if (TREE_CODE (stmt) != MODIFY_EXPR || TREE_OPERAND (stmt, 0) != lhs) return (unsigned HOST_WIDE_INT) -1; rhs = TREE_OPERAND (stmt, 1); if (TREE_CODE (rhs) == WITH_SIZE_EXPR) rhs = TREE_OPERAND (rhs, 0); if (TREE_CODE (rhs) == SSA_NAME) { lhs = rhs; continue; } if ((TREE_CODE (rhs) == NOP_EXPR || TREE_CODE (rhs) == CONVERT_EXPR) && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME) { lhs = TREE_OPERAND (rhs, 0); continue; } if (TREE_CODE (rhs) == PLUS_EXPR && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME && TREE_CODE (TREE_OPERAND (rhs, 1)) == INTEGER_CST && host_integerp (TREE_OPERAND (rhs, 1), 1)) { ret += tree_low_cst (TREE_OPERAND (rhs, 1), 1); lhs = TREE_OPERAND (rhs, 0); continue; } if (TREE_CODE (counter) != TREE_CODE (rhs)) return (unsigned HOST_WIDE_INT) -1; if (TREE_CODE (counter) == COMPONENT_REF) { if (get_base_address (counter) != get_base_address (rhs) || TREE_CODE (TREE_OPERAND (rhs, 1)) != FIELD_DECL || TREE_OPERAND (counter, 1) != TREE_OPERAND (rhs, 1)) return (unsigned HOST_WIDE_INT) -1; } else if (counter != rhs) return (unsigned HOST_WIDE_INT) -1; lhs = NULL; } lhs = orig_lhs; val = ret + counter_val; while (lhs) { if (si->offsets[SSA_NAME_VERSION (lhs)] != -1) break; if (val >= max_size) si->offsets[SSA_NAME_VERSION (lhs)] = max_size; else si->offsets[SSA_NAME_VERSION (lhs)] = val; stmt = SSA_NAME_DEF_STMT (lhs); rhs = TREE_OPERAND (stmt, 1); if (TREE_CODE (rhs) == WITH_SIZE_EXPR) rhs = TREE_OPERAND (rhs, 0); if (TREE_CODE (rhs) == SSA_NAME) { lhs = rhs; continue; } if ((TREE_CODE (rhs) == NOP_EXPR || TREE_CODE (rhs) == CONVERT_EXPR) && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME) { lhs = TREE_OPERAND (rhs, 0); continue; } if (TREE_CODE (rhs) == PLUS_EXPR && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME && TREE_CODE (TREE_OPERAND (rhs, 1)) == INTEGER_CST && host_integerp (TREE_OPERAND (rhs, 1), 1)) { val -= tree_low_cst (TREE_OPERAND (rhs, 1), 1); lhs = TREE_OPERAND (rhs, 0); continue; } lhs = NULL; } return ret; } /* Called by walk_tree to look for references to va_list variables. */ static tree find_va_list_reference (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED, void *data) { bitmap va_list_vars = (bitmap) data; tree var = *tp; if (TREE_CODE (var) == SSA_NAME) var = SSA_NAME_VAR (var); if (TREE_CODE (var) == VAR_DECL && bitmap_bit_p (va_list_vars, DECL_UID (var))) return var; return NULL_TREE; } /* Helper function of va_list_counter_struct_op. Compute cfun->va_list_{g,f}pr_size. AP is a va_list GPR/FPR counter, if WRITE_P is true, seen in AP = VAR, otherwise seen in VAR = AP statement. GPR_P is true if AP is a GPR counter, false if it is a FPR counter. */ static void va_list_counter_op (struct stdarg_info *si, tree ap, tree var, bool gpr_p, bool write_p) { unsigned HOST_WIDE_INT increment; if (si->compute_sizes < 0) { si->compute_sizes = 0; if (si->va_start_count == 1 && reachable_at_most_once (si->bb, si->va_start_bb)) si->compute_sizes = 1; if (dump_file && (dump_flags & TDF_DETAILS)) fprintf (dump_file, "bb%d will %sbe executed at most once for each va_start " "in bb%d\n", si->bb->index, si->compute_sizes ? "" : "not ", si->va_start_bb->index); } if (write_p && si->compute_sizes && (increment = va_list_counter_bump (si, ap, var, gpr_p)) + 1 > 1) { if (gpr_p && cfun->va_list_gpr_size + increment < VA_LIST_MAX_GPR_SIZE) { cfun->va_list_gpr_size += increment; return; } if (!gpr_p && cfun->va_list_fpr_size + increment < VA_LIST_MAX_FPR_SIZE) { cfun->va_list_fpr_size += increment; return; } } if (write_p || !si->compute_sizes) { if (gpr_p) cfun->va_list_gpr_size = VA_LIST_MAX_GPR_SIZE; else cfun->va_list_fpr_size = VA_LIST_MAX_FPR_SIZE; } } /* If AP is a va_list GPR/FPR counter, compute cfun->va_list_{g,f}pr_size. If WRITE_P is true, AP has been seen in AP = VAR assignment, if WRITE_P is false, AP has been seen in VAR = AP assignment. Return true if the AP = VAR (resp. VAR = AP) statement is a recognized va_arg operation that doesn't cause the va_list variable to escape current function. */ static bool va_list_counter_struct_op (struct stdarg_info *si, tree ap, tree var, bool write_p) { tree base; if (TREE_CODE (ap) != COMPONENT_REF || TREE_CODE (TREE_OPERAND (ap, 1)) != FIELD_DECL) return false; if (TREE_CODE (var) != SSA_NAME || bitmap_bit_p (si->va_list_vars, DECL_UID (SSA_NAME_VAR (var)))) return false; base = get_base_address (ap); if (TREE_CODE (base) != VAR_DECL || !bitmap_bit_p (si->va_list_vars, DECL_UID (base))) return false; if (TREE_OPERAND (ap, 1) == va_list_gpr_counter_field) va_list_counter_op (si, ap, var, true, write_p); else if (TREE_OPERAND (ap, 1) == va_list_fpr_counter_field) va_list_counter_op (si, ap, var, false, write_p); return true; } /* Check for TEM = AP. Return true if found and the caller shouldn't search for va_list references in the statement. */ static bool va_list_ptr_read (struct stdarg_info *si, tree ap, tree tem) { if (TREE_CODE (ap) != VAR_DECL || !bitmap_bit_p (si->va_list_vars, DECL_UID (ap))) return false; if (TREE_CODE (tem) != SSA_NAME || bitmap_bit_p (si->va_list_vars, DECL_UID (SSA_NAME_VAR (tem))) || is_global_var (SSA_NAME_VAR (tem))) return false; if (si->compute_sizes < 0) { si->compute_sizes = 0; if (si->va_start_count == 1 && reachable_at_most_once (si->bb, si->va_start_bb)) si->compute_sizes = 1; if (dump_file && (dump_flags & TDF_DETAILS)) fprintf (dump_file, "bb%d will %sbe executed at most once for each va_start " "in bb%d\n", si->bb->index, si->compute_sizes ? "" : "not ", si->va_start_bb->index); } /* For void * or char * va_list types, there is just one counter. If va_arg is used in a loop, we don't know how many registers need saving. */ if (! si->compute_sizes) return false; if (va_list_counter_bump (si, ap, tem, true) == (unsigned HOST_WIDE_INT) -1) return false; /* Note the temporary, as we need to track whether it doesn't escape the current function. */ bitmap_set_bit (si->va_list_escape_vars, DECL_UID (SSA_NAME_VAR (tem))); return true; } /* Check for: tem1 = AP; TEM2 = tem1 + CST; AP = TEM2; sequence and update cfun->va_list_gpr_size. Return true if found. */ static bool va_list_ptr_write (struct stdarg_info *si, tree ap, tree tem2) { unsigned HOST_WIDE_INT increment; if (TREE_CODE (ap) != VAR_DECL || !bitmap_bit_p (si->va_list_vars, DECL_UID (ap))) return false; if (TREE_CODE (tem2) != SSA_NAME || bitmap_bit_p (si->va_list_vars, DECL_UID (SSA_NAME_VAR (tem2)))) return false; if (si->compute_sizes <= 0) return false; increment = va_list_counter_bump (si, ap, tem2, true); if (increment + 1 <= 1) return false; if (cfun->va_list_gpr_size + increment < VA_LIST_MAX_GPR_SIZE) cfun->va_list_gpr_size += increment; else cfun->va_list_gpr_size = VA_LIST_MAX_GPR_SIZE; return true; } /* If RHS is X, (some type *) X or X + CST for X a temporary variable containing value of some va_list variable plus optionally some constant, either set si->va_list_escapes or add LHS to si->va_list_escape_vars, depending whether LHS is a function local temporary. */ static void check_va_list_escapes (struct stdarg_info *si, tree lhs, tree rhs) { if (! POINTER_TYPE_P (TREE_TYPE (rhs))) return; if ((TREE_CODE (rhs) == PLUS_EXPR && TREE_CODE (TREE_OPERAND (rhs, 1)) == INTEGER_CST) || TREE_CODE (rhs) == NOP_EXPR || TREE_CODE (rhs) == CONVERT_EXPR) rhs = TREE_OPERAND (rhs, 0); if (TREE_CODE (rhs) != SSA_NAME || ! bitmap_bit_p (si->va_list_escape_vars, DECL_UID (SSA_NAME_VAR (rhs)))) return; if (TREE_CODE (lhs) != SSA_NAME || is_global_var (SSA_NAME_VAR (lhs))) { si->va_list_escapes = true; return; } if (si->compute_sizes < 0) { si->compute_sizes = 0; if (si->va_start_count == 1 && reachable_at_most_once (si->bb, si->va_start_bb)) si->compute_sizes = 1; if (dump_file && (dump_flags & TDF_DETAILS)) fprintf (dump_file, "bb%d will %sbe executed at most once for each va_start " "in bb%d\n", si->bb->index, si->compute_sizes ? "" : "not ", si->va_start_bb->index); } /* For void * or char * va_list types, there is just one counter. If va_arg is used in a loop, we don't know how many registers need saving. */ if (! si->compute_sizes) { si->va_list_escapes = true; return; } if (va_list_counter_bump (si, si->va_start_ap, lhs, true) == (unsigned HOST_WIDE_INT) -1) { si->va_list_escapes = true; return; } bitmap_set_bit (si->va_list_escape_vars, DECL_UID (SSA_NAME_VAR (lhs))); } /* Check all uses of temporaries from si->va_list_escape_vars bitmap. Return true if va_list might be escaping. */ static bool check_all_va_list_escapes (struct stdarg_info *si) { basic_block bb; FOR_EACH_BB (bb) { block_stmt_iterator i; for (i = bsi_start (bb); !bsi_end_p (i); bsi_next (&i)) { tree stmt = bsi_stmt (i), use; ssa_op_iter iter; FOR_EACH_SSA_TREE_OPERAND (use, stmt, iter, SSA_OP_ALL_USES) { if (! bitmap_bit_p (si->va_list_escape_vars, DECL_UID (SSA_NAME_VAR (use)))) continue; if (TREE_CODE (stmt) == MODIFY_EXPR) { tree lhs = TREE_OPERAND (stmt, 0); tree rhs = TREE_OPERAND (stmt, 1); if (TREE_CODE (rhs) == WITH_SIZE_EXPR) rhs = TREE_OPERAND (rhs, 0); /* x = *ap_temp; */ if (TREE_CODE (rhs) == INDIRECT_REF && TREE_OPERAND (rhs, 0) == use && TYPE_SIZE_UNIT (TREE_TYPE (rhs)) && host_integerp (TYPE_SIZE_UNIT (TREE_TYPE (rhs)), 1) && si->offsets[SSA_NAME_VERSION (use)] != -1) { unsigned HOST_WIDE_INT gpr_size; tree access_size = TYPE_SIZE_UNIT (TREE_TYPE (rhs)); gpr_size = si->offsets[SSA_NAME_VERSION (use)] + tree_low_cst (access_size, 1); if (gpr_size >= VA_LIST_MAX_GPR_SIZE) cfun->va_list_gpr_size = VA_LIST_MAX_GPR_SIZE; else if (gpr_size > cfun->va_list_gpr_size) cfun->va_list_gpr_size = gpr_size; continue; } /* va_arg sequences may contain other_ap_temp = ap_temp; other_ap_temp = ap_temp + constant; other_ap_temp = (some_type *) ap_temp; ap = ap_temp; statements. */ if ((TREE_CODE (rhs) == PLUS_EXPR && TREE_CODE (TREE_OPERAND (rhs, 1)) == INTEGER_CST) || TREE_CODE (rhs) == NOP_EXPR || TREE_CODE (rhs) == CONVERT_EXPR) rhs = TREE_OPERAND (rhs, 0); if (rhs == use) { if (TREE_CODE (lhs) == SSA_NAME && bitmap_bit_p (si->va_list_escape_vars, DECL_UID (SSA_NAME_VAR (lhs)))) continue; if (TREE_CODE (lhs) == VAR_DECL && bitmap_bit_p (si->va_list_vars, DECL_UID (lhs))) continue; } } if (dump_file && (dump_flags & TDF_DETAILS)) { fputs ("va_list escapes in ", dump_file); print_generic_expr (dump_file, stmt, dump_flags); fputc ('\n', dump_file); } return true; } } } return false; } /* Return true if this optimization pass should be done. It makes only sense for stdarg functions. */ static bool gate_optimize_stdarg (void) { /* This optimization is only for stdarg functions. */ return current_function_stdarg != 0; } /* Entry point to the stdarg optimization pass. */ static unsigned int execute_optimize_stdarg (void) { basic_block bb; bool va_list_escapes = false; bool va_list_simple_ptr; struct stdarg_info si; const char *funcname = NULL; cfun->va_list_gpr_size = 0; cfun->va_list_fpr_size = 0; memset (&si, 0, sizeof (si)); si.va_list_vars = BITMAP_ALLOC (NULL); si.va_list_escape_vars = BITMAP_ALLOC (NULL); if (dump_file) funcname = lang_hooks.decl_printable_name (current_function_decl, 2); va_list_simple_ptr = POINTER_TYPE_P (va_list_type_node) && (TREE_TYPE (va_list_type_node) == void_type_node || TREE_TYPE (va_list_type_node) == char_type_node); gcc_assert (is_gimple_reg_type (va_list_type_node) == va_list_simple_ptr); FOR_EACH_BB (bb) { block_stmt_iterator i; for (i = bsi_start (bb); !bsi_end_p (i); bsi_next (&i)) { tree stmt = bsi_stmt (i); tree call = get_call_expr_in (stmt), callee; tree ap; if (!call) continue; callee = get_callee_fndecl (call); if (!callee || DECL_BUILT_IN_CLASS (callee) != BUILT_IN_NORMAL) continue; switch (DECL_FUNCTION_CODE (callee)) { case BUILT_IN_VA_START: break; /* If old style builtins are used, don't optimize anything. */ case BUILT_IN_SAVEREGS: case BUILT_IN_STDARG_START: case BUILT_IN_ARGS_INFO: case BUILT_IN_NEXT_ARG: va_list_escapes = true; continue; default: continue; } si.va_start_count++; ap = TREE_VALUE (TREE_OPERAND (call, 1)); if (TREE_CODE (ap) != ADDR_EXPR) { va_list_escapes = true; break; } ap = TREE_OPERAND (ap, 0); if (TREE_CODE (ap) == ARRAY_REF) { if (! integer_zerop (TREE_OPERAND (ap, 1))) { va_list_escapes = true; break; } ap = TREE_OPERAND (ap, 0); } if (TYPE_MAIN_VARIANT (TREE_TYPE (ap)) != TYPE_MAIN_VARIANT (va_list_type_node) || TREE_CODE (ap) != VAR_DECL) { va_list_escapes = true; break; } if (is_global_var (ap)) { va_list_escapes = true; break; } bitmap_set_bit (si.va_list_vars, DECL_UID (ap)); /* VA_START_BB and VA_START_AP will be only used if there is just one va_start in the function. */ si.va_start_bb = bb; si.va_start_ap = ap; } if (va_list_escapes) break; } /* If there were no va_start uses in the function, there is no need to save anything. */ if (si.va_start_count == 0) goto finish; /* If some va_list arguments weren't local, we can't optimize. */ if (va_list_escapes) goto finish; /* For void * or char * va_list, something useful can be done only if there is just one va_start. */ if (va_list_simple_ptr && si.va_start_count > 1) { va_list_escapes = true; goto finish; } /* For struct * va_list, if the backend didn't tell us what the counter fields are, there is nothing more we can do. */ if (!va_list_simple_ptr && va_list_gpr_counter_field == NULL_TREE && va_list_fpr_counter_field == NULL_TREE) { va_list_escapes = true; goto finish; } /* For void * or char * va_list there is just one counter (va_list itself). Use VA_LIST_GPR_SIZE for it. */ if (va_list_simple_ptr) cfun->va_list_fpr_size = VA_LIST_MAX_FPR_SIZE; calculate_dominance_info (CDI_DOMINATORS); FOR_EACH_BB (bb) { block_stmt_iterator i; si.compute_sizes = -1; si.bb = bb; /* For va_list_simple_ptr, we have to check PHI nodes too. We treat them as assignments for the purpose of escape analysis. This is not needed for non-simple va_list because virtual phis don't perform any real data movement. */ if (va_list_simple_ptr) { tree phi, lhs, rhs; use_operand_p uop; ssa_op_iter soi; for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi)) { lhs = PHI_RESULT (phi); if (!is_gimple_reg (lhs)) continue; FOR_EACH_PHI_ARG (uop, phi, soi, SSA_OP_USE) { rhs = USE_FROM_PTR (uop); if (va_list_ptr_read (&si, rhs, lhs)) continue; else if (va_list_ptr_write (&si, lhs, rhs)) continue; else check_va_list_escapes (&si, lhs, rhs); if (si.va_list_escapes || walk_tree (&phi, find_va_list_reference, si.va_list_vars, NULL)) { if (dump_file && (dump_flags & TDF_DETAILS)) { fputs ("va_list escapes in ", dump_file); print_generic_expr (dump_file, phi, dump_flags); fputc ('\n', dump_file); } va_list_escapes = true; } } } } for (i = bsi_start (bb); !bsi_end_p (i) && !va_list_escapes; bsi_next (&i)) { tree stmt = bsi_stmt (i); tree call; /* Don't look at __builtin_va_{start,end}, they are ok. */ call = get_call_expr_in (stmt); if (call) { tree callee = get_callee_fndecl (call); if (callee && DECL_BUILT_IN_CLASS (callee) == BUILT_IN_NORMAL && (DECL_FUNCTION_CODE (callee) == BUILT_IN_VA_START || DECL_FUNCTION_CODE (callee) == BUILT_IN_VA_END)) continue; } if (TREE_CODE (stmt) == MODIFY_EXPR) { tree lhs = TREE_OPERAND (stmt, 0); tree rhs = TREE_OPERAND (stmt, 1); if (TREE_CODE (rhs) == WITH_SIZE_EXPR) rhs = TREE_OPERAND (rhs, 0); if (va_list_simple_ptr) { /* Check for tem = ap. */ if (va_list_ptr_read (&si, rhs, lhs)) continue; /* Check for the last insn in: tem1 = ap; tem2 = tem1 + CST; ap = tem2; sequence. */ else if (va_list_ptr_write (&si, lhs, rhs)) continue; else check_va_list_escapes (&si, lhs, rhs); } else { /* Check for ap[0].field = temp. */ if (va_list_counter_struct_op (&si, lhs, rhs, true)) continue; /* Check for temp = ap[0].field. */ else if (va_list_counter_struct_op (&si, rhs, lhs, false)) continue; /* Do any architecture specific checking. */ else if (targetm.stdarg_optimize_hook && targetm.stdarg_optimize_hook (&si, lhs, rhs)) continue; } } /* All other uses of va_list are either va_copy (that is not handled in this optimization), taking address of va_list variable or passing va_list to other functions (in that case va_list might escape the function and therefore va_start needs to set it up fully), or some unexpected use of va_list. None of these should happen in a gimplified VA_ARG_EXPR. */ if (si.va_list_escapes || walk_tree (&stmt, find_va_list_reference, si.va_list_vars, NULL)) { if (dump_file && (dump_flags & TDF_DETAILS)) { fputs ("va_list escapes in ", dump_file); print_generic_expr (dump_file, stmt, dump_flags); fputc ('\n', dump_file); } va_list_escapes = true; } } if (va_list_escapes) break; } if (! va_list_escapes && va_list_simple_ptr && ! bitmap_empty_p (si.va_list_escape_vars) && check_all_va_list_escapes (&si)) va_list_escapes = true; finish: if (va_list_escapes) { cfun->va_list_gpr_size = VA_LIST_MAX_GPR_SIZE; cfun->va_list_fpr_size = VA_LIST_MAX_FPR_SIZE; } BITMAP_FREE (si.va_list_vars); BITMAP_FREE (si.va_list_escape_vars); free (si.offsets); if (dump_file) { fprintf (dump_file, "%s: va_list escapes %d, needs to save ", funcname, (int) va_list_escapes); if (cfun->va_list_gpr_size >= VA_LIST_MAX_GPR_SIZE) fputs ("all", dump_file); else fprintf (dump_file, "%d", cfun->va_list_gpr_size); fputs (" GPR units and ", dump_file); if (cfun->va_list_fpr_size >= VA_LIST_MAX_FPR_SIZE) fputs ("all", dump_file); else fprintf (dump_file, "%d", cfun->va_list_fpr_size); fputs (" FPR units.\n", dump_file); } return 0; } struct tree_opt_pass pass_stdarg = { "stdarg", /* name */ gate_optimize_stdarg, /* gate */ execute_optimize_stdarg, /* execute */ NULL, /* sub */ NULL, /* next */ 0, /* static_pass_number */ 0, /* tv_id */ PROP_cfg | PROP_ssa | PROP_alias, /* properties_required */ 0, /* properties_provided */ 0, /* properties_destroyed */ 0, /* todo_flags_start */ TODO_dump_func, /* todo_flags_finish */ 0 /* letter */ };
Go to most recent revision | Compare with Previous | Blame | View Log