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/* C++-specific tree lowering bits; see also c-gimplify.c and tree-gimple.c. Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. Contributed by Jason Merrill <jason@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 "cp-tree.h" #include "c-family/c-common.h" #include "tree-iterator.h" #include "gimple.h" #include "hashtab.h" #include "pointer-set.h" #include "flags.h" #include "splay-tree.h" /* Local declarations. */ enum bc_t { bc_break = 0, bc_continue = 1 }; /* Stack of labels which are targets for "break" or "continue", linked through TREE_CHAIN. */ static tree bc_label[2]; /* Begin a scope which can be exited by a break or continue statement. BC indicates which. Just creates a label and pushes it into the current context. */ static tree begin_bc_block (enum bc_t bc) { tree label = create_artificial_label (input_location); DECL_CHAIN (label) = bc_label[bc]; bc_label[bc] = label; return label; } /* Finish a scope which can be exited by a break or continue statement. LABEL was returned from the most recent call to begin_bc_block. BODY is an expression for the contents of the scope. If we saw a break (or continue) in the scope, append a LABEL_EXPR to body. Otherwise, just forget the label. */ static gimple_seq finish_bc_block (enum bc_t bc, tree label, gimple_seq body) { gcc_assert (label == bc_label[bc]); if (TREE_USED (label)) { gimple_seq_add_stmt (&body, gimple_build_label (label)); } bc_label[bc] = DECL_CHAIN (label); DECL_CHAIN (label) = NULL_TREE; return body; } /* Get the LABEL_EXPR to represent a break or continue statement in the current block scope. BC indicates which. */ static tree get_bc_label (enum bc_t bc) { tree label = bc_label[bc]; /* Mark the label used for finish_bc_block. */ TREE_USED (label) = 1; return label; } /* Genericize a TRY_BLOCK. */ static void genericize_try_block (tree *stmt_p) { tree body = TRY_STMTS (*stmt_p); tree cleanup = TRY_HANDLERS (*stmt_p); *stmt_p = build2 (TRY_CATCH_EXPR, void_type_node, body, cleanup); } /* Genericize a HANDLER by converting to a CATCH_EXPR. */ static void genericize_catch_block (tree *stmt_p) { tree type = HANDLER_TYPE (*stmt_p); tree body = HANDLER_BODY (*stmt_p); /* FIXME should the caught type go in TREE_TYPE? */ *stmt_p = build2 (CATCH_EXPR, void_type_node, type, body); } /* A terser interface for building a representation of an exception specification. */ static tree build_gimple_eh_filter_tree (tree body, tree allowed, tree failure) { tree t; /* FIXME should the allowed types go in TREE_TYPE? */ t = build2 (EH_FILTER_EXPR, void_type_node, allowed, NULL_TREE); append_to_statement_list (failure, &EH_FILTER_FAILURE (t)); t = build2 (TRY_CATCH_EXPR, void_type_node, NULL_TREE, t); append_to_statement_list (body, &TREE_OPERAND (t, 0)); return t; } /* Genericize an EH_SPEC_BLOCK by converting it to a TRY_CATCH_EXPR/EH_FILTER_EXPR pair. */ static void genericize_eh_spec_block (tree *stmt_p) { tree body = EH_SPEC_STMTS (*stmt_p); tree allowed = EH_SPEC_RAISES (*stmt_p); tree failure = build_call_n (call_unexpected_node, 1, build_exc_ptr ()); *stmt_p = build_gimple_eh_filter_tree (body, allowed, failure); TREE_NO_WARNING (*stmt_p) = true; TREE_NO_WARNING (TREE_OPERAND (*stmt_p, 1)) = true; } /* Genericize an IF_STMT by turning it into a COND_EXPR. */ static void genericize_if_stmt (tree *stmt_p) { tree stmt, cond, then_, else_; location_t locus = EXPR_LOCATION (*stmt_p); stmt = *stmt_p; cond = IF_COND (stmt); then_ = THEN_CLAUSE (stmt); else_ = ELSE_CLAUSE (stmt); if (!then_) then_ = build_empty_stmt (locus); if (!else_) else_ = build_empty_stmt (locus); if (integer_nonzerop (cond) && !TREE_SIDE_EFFECTS (else_)) stmt = then_; else if (integer_zerop (cond) && !TREE_SIDE_EFFECTS (then_)) stmt = else_; else stmt = build3 (COND_EXPR, void_type_node, cond, then_, else_); if (CAN_HAVE_LOCATION_P (stmt) && !EXPR_HAS_LOCATION (stmt)) SET_EXPR_LOCATION (stmt, locus); *stmt_p = stmt; } /* Build a generic representation of one of the C loop forms. COND is the loop condition or NULL_TREE. BODY is the (possibly compound) statement controlled by the loop. INCR is the increment expression of a for-loop, or NULL_TREE. COND_IS_FIRST indicates whether the condition is evaluated before the loop body as in while and for loops, or after the loop body as in do-while loops. */ static gimple_seq gimplify_cp_loop (tree cond, tree body, tree incr, bool cond_is_first) { gimple top, entry, stmt; gimple_seq stmt_list, body_seq, incr_seq, exit_seq; tree cont_block, break_block; location_t stmt_locus; stmt_locus = input_location; stmt_list = NULL; body_seq = NULL; incr_seq = NULL; exit_seq = NULL; entry = NULL; break_block = begin_bc_block (bc_break); cont_block = begin_bc_block (bc_continue); /* If condition is zero don't generate a loop construct. */ if (cond && integer_zerop (cond)) { top = NULL; if (cond_is_first) { stmt = gimple_build_goto (get_bc_label (bc_break)); gimple_set_location (stmt, stmt_locus); gimple_seq_add_stmt (&stmt_list, stmt); } } else { /* If we use a LOOP_EXPR here, we have to feed the whole thing back through the main gimplifier to lower it. Given that we have to gimplify the loop body NOW so that we can resolve break/continue stmts, seems easier to just expand to gotos. */ top = gimple_build_label (create_artificial_label (stmt_locus)); /* If we have an exit condition, then we build an IF with gotos either out of the loop, or to the top of it. If there's no exit condition, then we just build a jump back to the top. */ if (cond && !integer_nonzerop (cond)) { if (cond != error_mark_node) { gimplify_expr (&cond, &exit_seq, NULL, is_gimple_val, fb_rvalue); stmt = gimple_build_cond (NE_EXPR, cond, build_int_cst (TREE_TYPE (cond), 0), gimple_label_label (top), get_bc_label (bc_break)); gimple_seq_add_stmt (&exit_seq, stmt); } if (cond_is_first) { if (incr) { entry = gimple_build_label (create_artificial_label (stmt_locus)); stmt = gimple_build_goto (gimple_label_label (entry)); } else stmt = gimple_build_goto (get_bc_label (bc_continue)); gimple_set_location (stmt, stmt_locus); gimple_seq_add_stmt (&stmt_list, stmt); } } else { stmt = gimple_build_goto (gimple_label_label (top)); gimple_seq_add_stmt (&exit_seq, stmt); } } gimplify_stmt (&body, &body_seq); gimplify_stmt (&incr, &incr_seq); body_seq = finish_bc_block (bc_continue, cont_block, body_seq); gimple_seq_add_stmt (&stmt_list, top); gimple_seq_add_seq (&stmt_list, body_seq); gimple_seq_add_seq (&stmt_list, incr_seq); gimple_seq_add_stmt (&stmt_list, entry); gimple_seq_add_seq (&stmt_list, exit_seq); annotate_all_with_location (stmt_list, stmt_locus); return finish_bc_block (bc_break, break_block, stmt_list); } /* Gimplify a FOR_STMT node. Move the stuff in the for-init-stmt into the prequeue and hand off to gimplify_cp_loop. */ static void gimplify_for_stmt (tree *stmt_p, gimple_seq *pre_p) { tree stmt = *stmt_p; if (FOR_INIT_STMT (stmt)) gimplify_and_add (FOR_INIT_STMT (stmt), pre_p); gimple_seq_add_seq (pre_p, gimplify_cp_loop (FOR_COND (stmt), FOR_BODY (stmt), FOR_EXPR (stmt), 1)); *stmt_p = NULL_TREE; } /* Gimplify a WHILE_STMT node. */ static void gimplify_while_stmt (tree *stmt_p, gimple_seq *pre_p) { tree stmt = *stmt_p; gimple_seq_add_seq (pre_p, gimplify_cp_loop (WHILE_COND (stmt), WHILE_BODY (stmt), NULL_TREE, 1)); *stmt_p = NULL_TREE; } /* Gimplify a DO_STMT node. */ static void gimplify_do_stmt (tree *stmt_p, gimple_seq *pre_p) { tree stmt = *stmt_p; gimple_seq_add_seq (pre_p, gimplify_cp_loop (DO_COND (stmt), DO_BODY (stmt), NULL_TREE, 0)); *stmt_p = NULL_TREE; } /* Genericize a SWITCH_STMT by turning it into a SWITCH_EXPR. */ static void gimplify_switch_stmt (tree *stmt_p, gimple_seq *pre_p) { tree stmt = *stmt_p; tree break_block, body, t; location_t stmt_locus = input_location; gimple_seq seq = NULL; break_block = begin_bc_block (bc_break); body = SWITCH_STMT_BODY (stmt); if (!body) body = build_empty_stmt (stmt_locus); t = build3 (SWITCH_EXPR, SWITCH_STMT_TYPE (stmt), SWITCH_STMT_COND (stmt), body, NULL_TREE); SET_EXPR_LOCATION (t, stmt_locus); gimplify_and_add (t, &seq); seq = finish_bc_block (bc_break, break_block, seq); gimple_seq_add_seq (pre_p, seq); *stmt_p = NULL_TREE; } /* Hook into the middle of gimplifying an OMP_FOR node. This is required in order to properly gimplify CONTINUE statements. Here we merely manage the continue stack; the rest of the job is performed by the regular gimplifier. */ static enum gimplify_status cp_gimplify_omp_for (tree *expr_p, gimple_seq *pre_p) { tree for_stmt = *expr_p; tree cont_block; gimple stmt; gimple_seq seq = NULL; /* Protect ourselves from recursion. */ if (OMP_FOR_GIMPLIFYING_P (for_stmt)) return GS_UNHANDLED; OMP_FOR_GIMPLIFYING_P (for_stmt) = 1; /* Note that while technically the continue label is enabled too soon here, we should have already diagnosed invalid continues nested within statement expressions within the INIT, COND, or INCR expressions. */ cont_block = begin_bc_block (bc_continue); gimplify_and_add (for_stmt, &seq); stmt = gimple_seq_last_stmt (seq); if (gimple_code (stmt) == GIMPLE_OMP_FOR) gimple_omp_set_body (stmt, finish_bc_block (bc_continue, cont_block, gimple_omp_body (stmt))); else seq = finish_bc_block (bc_continue, cont_block, seq); gimple_seq_add_seq (pre_p, seq); OMP_FOR_GIMPLIFYING_P (for_stmt) = 0; return GS_ALL_DONE; } /* Gimplify an EXPR_STMT node. */ static void gimplify_expr_stmt (tree *stmt_p) { tree stmt = EXPR_STMT_EXPR (*stmt_p); if (stmt == error_mark_node) stmt = NULL; /* Gimplification of a statement expression will nullify the statement if all its side effects are moved to *PRE_P and *POST_P. In this case we will not want to emit the gimplified statement. However, we may still want to emit a warning, so we do that before gimplification. */ if (stmt && warn_unused_value) { if (!TREE_SIDE_EFFECTS (stmt)) { if (!IS_EMPTY_STMT (stmt) && !VOID_TYPE_P (TREE_TYPE (stmt)) && !TREE_NO_WARNING (stmt)) warning (OPT_Wunused_value, "statement with no effect"); } else warn_if_unused_value (stmt, input_location); } if (stmt == NULL_TREE) stmt = alloc_stmt_list (); *stmt_p = stmt; } /* Gimplify initialization from an AGGR_INIT_EXPR. */ static void cp_gimplify_init_expr (tree *expr_p) { tree from = TREE_OPERAND (*expr_p, 1); tree to = TREE_OPERAND (*expr_p, 0); tree t; /* What about code that pulls out the temp and uses it elsewhere? I think that such code never uses the TARGET_EXPR as an initializer. If I'm wrong, we'll abort because the temp won't have any RTL. In that case, I guess we'll need to replace references somehow. */ if (TREE_CODE (from) == TARGET_EXPR) from = TARGET_EXPR_INITIAL (from); /* Look through any COMPOUND_EXPRs, since build_compound_expr pushes them inside the TARGET_EXPR. */ for (t = from; t; ) { tree sub = TREE_CODE (t) == COMPOUND_EXPR ? TREE_OPERAND (t, 0) : t; /* If we are initializing from an AGGR_INIT_EXPR, drop the INIT_EXPR and replace the slot operand with our target. Should we add a target parm to gimplify_expr instead? No, as in this case we want to replace the INIT_EXPR. */ if (TREE_CODE (sub) == AGGR_INIT_EXPR || TREE_CODE (sub) == VEC_INIT_EXPR) { if (TREE_CODE (sub) == AGGR_INIT_EXPR) AGGR_INIT_EXPR_SLOT (sub) = to; else VEC_INIT_EXPR_SLOT (sub) = to; *expr_p = from; /* The initialization is now a side-effect, so the container can become void. */ if (from != sub) TREE_TYPE (from) = void_type_node; } if (t == sub) break; else t = TREE_OPERAND (t, 1); } } /* Gimplify a MUST_NOT_THROW_EXPR. */ static enum gimplify_status gimplify_must_not_throw_expr (tree *expr_p, gimple_seq *pre_p) { tree stmt = *expr_p; tree temp = voidify_wrapper_expr (stmt, NULL); tree body = TREE_OPERAND (stmt, 0); gimple_seq try_ = NULL; gimple_seq catch_ = NULL; gimple mnt; gimplify_and_add (body, &try_); mnt = gimple_build_eh_must_not_throw (terminate_node); gimple_seq_add_stmt_without_update (&catch_, mnt); mnt = gimple_build_try (try_, catch_, GIMPLE_TRY_CATCH); gimple_seq_add_stmt_without_update (pre_p, mnt); if (temp) { *expr_p = temp; return GS_OK; } *expr_p = NULL; return GS_ALL_DONE; } /* Do C++-specific gimplification. Args are as for gimplify_expr. */ int cp_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p) { int saved_stmts_are_full_exprs_p = 0; enum tree_code code = TREE_CODE (*expr_p); enum gimplify_status ret; if (STATEMENT_CODE_P (code)) { saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p (); current_stmt_tree ()->stmts_are_full_exprs_p = STMT_IS_FULL_EXPR_P (*expr_p); } switch (code) { case PTRMEM_CST: *expr_p = cplus_expand_constant (*expr_p); ret = GS_OK; break; case AGGR_INIT_EXPR: simplify_aggr_init_expr (expr_p); ret = GS_OK; break; case VEC_INIT_EXPR: { location_t loc = input_location; tree init = VEC_INIT_EXPR_INIT (*expr_p); int from_array = (init && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE); gcc_assert (EXPR_HAS_LOCATION (*expr_p)); input_location = EXPR_LOCATION (*expr_p); *expr_p = build_vec_init (VEC_INIT_EXPR_SLOT (*expr_p), NULL_TREE, init, VEC_INIT_EXPR_VALUE_INIT (*expr_p), from_array, tf_warning_or_error); ret = GS_OK; input_location = loc; } break; case THROW_EXPR: /* FIXME communicate throw type to back end, probably by moving THROW_EXPR into ../tree.def. */ *expr_p = TREE_OPERAND (*expr_p, 0); ret = GS_OK; break; case MUST_NOT_THROW_EXPR: ret = gimplify_must_not_throw_expr (expr_p, pre_p); break; /* We used to do this for MODIFY_EXPR as well, but that's unsafe; the LHS of an assignment might also be involved in the RHS, as in bug 25979. */ case INIT_EXPR: cp_gimplify_init_expr (expr_p); if (TREE_CODE (*expr_p) != INIT_EXPR) return GS_OK; /* Otherwise fall through. */ case MODIFY_EXPR: { /* If the back end isn't clever enough to know that the lhs and rhs types are the same, add an explicit conversion. */ tree op0 = TREE_OPERAND (*expr_p, 0); tree op1 = TREE_OPERAND (*expr_p, 1); if (!error_operand_p (op0) && !error_operand_p (op1) && (TYPE_STRUCTURAL_EQUALITY_P (TREE_TYPE (op0)) || TYPE_STRUCTURAL_EQUALITY_P (TREE_TYPE (op1))) && !useless_type_conversion_p (TREE_TYPE (op1), TREE_TYPE (op0))) TREE_OPERAND (*expr_p, 1) = build1 (VIEW_CONVERT_EXPR, TREE_TYPE (op0), op1); else if ((is_gimple_lvalue (op1) || INDIRECT_REF_P (op1) || (TREE_CODE (op1) == CONSTRUCTOR && CONSTRUCTOR_NELTS (op1) == 0 && !TREE_CLOBBER_P (op1)) || (TREE_CODE (op1) == CALL_EXPR && !CALL_EXPR_RETURN_SLOT_OPT (op1))) && is_really_empty_class (TREE_TYPE (op0))) { /* Remove any copies of empty classes. We check that the RHS has a simple form so that TARGET_EXPRs and non-empty CONSTRUCTORs get reduced properly, and we leave the return slot optimization alone because it isn't a copy (FIXME so it shouldn't be represented as one). Also drop volatile variables on the RHS to avoid infinite recursion from gimplify_expr trying to load the value. */ if (!TREE_SIDE_EFFECTS (op1) || (DECL_P (op1) && TREE_THIS_VOLATILE (op1))) *expr_p = op0; else if (TREE_CODE (op1) == MEM_REF && TREE_THIS_VOLATILE (op1)) { /* Similarly for volatile MEM_REFs on the RHS. */ if (!TREE_SIDE_EFFECTS (TREE_OPERAND (op1, 0))) *expr_p = op0; else *expr_p = build2 (COMPOUND_EXPR, TREE_TYPE (*expr_p), TREE_OPERAND (op1, 0), op0); } else *expr_p = build2 (COMPOUND_EXPR, TREE_TYPE (*expr_p), op0, op1); } } ret = GS_OK; break; case EMPTY_CLASS_EXPR: /* We create an empty CONSTRUCTOR with RECORD_TYPE. */ *expr_p = build_constructor (TREE_TYPE (*expr_p), NULL); ret = GS_OK; break; case BASELINK: *expr_p = BASELINK_FUNCTIONS (*expr_p); ret = GS_OK; break; case TRY_BLOCK: genericize_try_block (expr_p); ret = GS_OK; break; case HANDLER: genericize_catch_block (expr_p); ret = GS_OK; break; case EH_SPEC_BLOCK: genericize_eh_spec_block (expr_p); ret = GS_OK; break; case USING_STMT: gcc_unreachable (); case FOR_STMT: gimplify_for_stmt (expr_p, pre_p); ret = GS_OK; break; case WHILE_STMT: gimplify_while_stmt (expr_p, pre_p); ret = GS_OK; break; case DO_STMT: gimplify_do_stmt (expr_p, pre_p); ret = GS_OK; break; case SWITCH_STMT: gimplify_switch_stmt (expr_p, pre_p); ret = GS_OK; break; case OMP_FOR: ret = cp_gimplify_omp_for (expr_p, pre_p); break; case CONTINUE_STMT: gimple_seq_add_stmt (pre_p, gimple_build_predict (PRED_CONTINUE, NOT_TAKEN)); gimple_seq_add_stmt (pre_p, gimple_build_goto (get_bc_label (bc_continue))); *expr_p = NULL_TREE; ret = GS_ALL_DONE; break; case BREAK_STMT: gimple_seq_add_stmt (pre_p, gimple_build_goto (get_bc_label (bc_break))); *expr_p = NULL_TREE; ret = GS_ALL_DONE; break; case EXPR_STMT: gimplify_expr_stmt (expr_p); ret = GS_OK; break; case UNARY_PLUS_EXPR: { tree arg = TREE_OPERAND (*expr_p, 0); tree type = TREE_TYPE (*expr_p); *expr_p = (TREE_TYPE (arg) != type) ? fold_convert (type, arg) : arg; ret = GS_OK; } break; default: ret = (enum gimplify_status) c_gimplify_expr (expr_p, pre_p, post_p); break; } /* Restore saved state. */ if (STATEMENT_CODE_P (code)) current_stmt_tree ()->stmts_are_full_exprs_p = saved_stmts_are_full_exprs_p; return ret; } static inline bool is_invisiref_parm (const_tree t) { return ((TREE_CODE (t) == PARM_DECL || TREE_CODE (t) == RESULT_DECL) && DECL_BY_REFERENCE (t)); } /* Return true if the uid in both int tree maps are equal. */ int cxx_int_tree_map_eq (const void *va, const void *vb) { const struct cxx_int_tree_map *a = (const struct cxx_int_tree_map *) va; const struct cxx_int_tree_map *b = (const struct cxx_int_tree_map *) vb; return (a->uid == b->uid); } /* Hash a UID in a cxx_int_tree_map. */ unsigned int cxx_int_tree_map_hash (const void *item) { return ((const struct cxx_int_tree_map *)item)->uid; } /* A stable comparison routine for use with splay trees and DECLs. */ static int splay_tree_compare_decl_uid (splay_tree_key xa, splay_tree_key xb) { tree a = (tree) xa; tree b = (tree) xb; return DECL_UID (a) - DECL_UID (b); } /* OpenMP context during genericization. */ struct cp_genericize_omp_taskreg { bool is_parallel; bool default_shared; struct cp_genericize_omp_taskreg *outer; splay_tree variables; }; /* Return true if genericization should try to determine if DECL is firstprivate or shared within task regions. */ static bool omp_var_to_track (tree decl) { tree type = TREE_TYPE (decl); if (is_invisiref_parm (decl)) type = TREE_TYPE (type); while (TREE_CODE (type) == ARRAY_TYPE) type = TREE_TYPE (type); if (type == error_mark_node || !CLASS_TYPE_P (type)) return false; if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl)) return false; if (cxx_omp_predetermined_sharing (decl) != OMP_CLAUSE_DEFAULT_UNSPECIFIED) return false; return true; } /* Note DECL use in OpenMP region OMP_CTX during genericization. */ static void omp_cxx_notice_variable (struct cp_genericize_omp_taskreg *omp_ctx, tree decl) { splay_tree_node n = splay_tree_lookup (omp_ctx->variables, (splay_tree_key) decl); if (n == NULL) { int flags = OMP_CLAUSE_DEFAULT_SHARED; if (omp_ctx->outer) omp_cxx_notice_variable (omp_ctx->outer, decl); if (!omp_ctx->default_shared) { struct cp_genericize_omp_taskreg *octx; for (octx = omp_ctx->outer; octx; octx = octx->outer) { n = splay_tree_lookup (octx->variables, (splay_tree_key) decl); if (n && n->value != OMP_CLAUSE_DEFAULT_SHARED) { flags = OMP_CLAUSE_DEFAULT_FIRSTPRIVATE; break; } if (octx->is_parallel) break; } if (octx == NULL && (TREE_CODE (decl) == PARM_DECL || (!(TREE_STATIC (decl) || DECL_EXTERNAL (decl)) && DECL_CONTEXT (decl) == current_function_decl))) flags = OMP_CLAUSE_DEFAULT_FIRSTPRIVATE; if (flags == OMP_CLAUSE_DEFAULT_FIRSTPRIVATE) { /* DECL is implicitly determined firstprivate in the current task construct. Ensure copy ctor and dtor are instantiated, because during gimplification it will be already too late. */ tree type = TREE_TYPE (decl); if (is_invisiref_parm (decl)) type = TREE_TYPE (type); while (TREE_CODE (type) == ARRAY_TYPE) type = TREE_TYPE (type); get_copy_ctor (type, tf_none); get_dtor (type, tf_none); } } splay_tree_insert (omp_ctx->variables, (splay_tree_key) decl, flags); } } /* Genericization context. */ struct cp_genericize_data { struct pointer_set_t *p_set; VEC (tree, heap) *bind_expr_stack; struct cp_genericize_omp_taskreg *omp_ctx; }; /* Perform any pre-gimplification lowering of C++ front end trees to GENERIC. */ static tree cp_genericize_r (tree *stmt_p, int *walk_subtrees, void *data) { tree stmt = *stmt_p; struct cp_genericize_data *wtd = (struct cp_genericize_data *) data; struct pointer_set_t *p_set = wtd->p_set; /* If in an OpenMP context, note var uses. */ if (__builtin_expect (wtd->omp_ctx != NULL, 0) && (TREE_CODE (stmt) == VAR_DECL || TREE_CODE (stmt) == PARM_DECL || TREE_CODE (stmt) == RESULT_DECL) && omp_var_to_track (stmt)) omp_cxx_notice_variable (wtd->omp_ctx, stmt); if (is_invisiref_parm (stmt) /* Don't dereference parms in a thunk, pass the references through. */ && !(DECL_THUNK_P (current_function_decl) && TREE_CODE (stmt) == PARM_DECL)) { *stmt_p = convert_from_reference (stmt); *walk_subtrees = 0; return NULL; } /* Map block scope extern declarations to visible declarations with the same name and type in outer scopes if any. */ if (cp_function_chain->extern_decl_map && (TREE_CODE (stmt) == FUNCTION_DECL || TREE_CODE (stmt) == VAR_DECL) && DECL_EXTERNAL (stmt)) { struct cxx_int_tree_map *h, in; in.uid = DECL_UID (stmt); h = (struct cxx_int_tree_map *) htab_find_with_hash (cp_function_chain->extern_decl_map, &in, in.uid); if (h) { *stmt_p = h->to; *walk_subtrees = 0; return NULL; } } /* Other than invisiref parms, don't walk the same tree twice. */ if (pointer_set_contains (p_set, stmt)) { *walk_subtrees = 0; return NULL_TREE; } if (TREE_CODE (stmt) == ADDR_EXPR && is_invisiref_parm (TREE_OPERAND (stmt, 0))) { /* If in an OpenMP context, note var uses. */ if (__builtin_expect (wtd->omp_ctx != NULL, 0) && omp_var_to_track (TREE_OPERAND (stmt, 0))) omp_cxx_notice_variable (wtd->omp_ctx, TREE_OPERAND (stmt, 0)); *stmt_p = convert (TREE_TYPE (stmt), TREE_OPERAND (stmt, 0)); *walk_subtrees = 0; } else if (TREE_CODE (stmt) == RETURN_EXPR && TREE_OPERAND (stmt, 0) && is_invisiref_parm (TREE_OPERAND (stmt, 0))) /* Don't dereference an invisiref RESULT_DECL inside a RETURN_EXPR. */ *walk_subtrees = 0; else if (TREE_CODE (stmt) == OMP_CLAUSE) switch (OMP_CLAUSE_CODE (stmt)) { case OMP_CLAUSE_LASTPRIVATE: /* Don't dereference an invisiref in OpenMP clauses. */ if (is_invisiref_parm (OMP_CLAUSE_DECL (stmt))) { *walk_subtrees = 0; if (OMP_CLAUSE_LASTPRIVATE_STMT (stmt)) cp_walk_tree (&OMP_CLAUSE_LASTPRIVATE_STMT (stmt), cp_genericize_r, data, NULL); } break; case OMP_CLAUSE_PRIVATE: /* Don't dereference an invisiref in OpenMP clauses. */ if (is_invisiref_parm (OMP_CLAUSE_DECL (stmt))) *walk_subtrees = 0; else if (wtd->omp_ctx != NULL) { /* Private clause doesn't cause any references to the var in outer contexts, avoid calling omp_cxx_notice_variable for it. */ struct cp_genericize_omp_taskreg *old = wtd->omp_ctx; wtd->omp_ctx = NULL; cp_walk_tree (&OMP_CLAUSE_DECL (stmt), cp_genericize_r, data, NULL); wtd->omp_ctx = old; *walk_subtrees = 0; } break; case OMP_CLAUSE_SHARED: case OMP_CLAUSE_FIRSTPRIVATE: case OMP_CLAUSE_COPYIN: case OMP_CLAUSE_COPYPRIVATE: /* Don't dereference an invisiref in OpenMP clauses. */ if (is_invisiref_parm (OMP_CLAUSE_DECL (stmt))) *walk_subtrees = 0; break; case OMP_CLAUSE_REDUCTION: gcc_assert (!is_invisiref_parm (OMP_CLAUSE_DECL (stmt))); break; default: break; } else if (IS_TYPE_OR_DECL_P (stmt)) *walk_subtrees = 0; /* Due to the way voidify_wrapper_expr is written, we don't get a chance to lower this construct before scanning it, so we need to lower these before doing anything else. */ else if (TREE_CODE (stmt) == CLEANUP_STMT) *stmt_p = build2 (CLEANUP_EH_ONLY (stmt) ? TRY_CATCH_EXPR : TRY_FINALLY_EXPR, void_type_node, CLEANUP_BODY (stmt), CLEANUP_EXPR (stmt)); else if (TREE_CODE (stmt) == IF_STMT) { genericize_if_stmt (stmt_p); /* *stmt_p has changed, tail recurse to handle it again. */ return cp_genericize_r (stmt_p, walk_subtrees, data); } /* COND_EXPR might have incompatible types in branches if one or both arms are bitfields. Fix it up now. */ else if (TREE_CODE (stmt) == COND_EXPR) { tree type_left = (TREE_OPERAND (stmt, 1) ? is_bitfield_expr_with_lowered_type (TREE_OPERAND (stmt, 1)) : NULL_TREE); tree type_right = (TREE_OPERAND (stmt, 2) ? is_bitfield_expr_with_lowered_type (TREE_OPERAND (stmt, 2)) : NULL_TREE); if (type_left && !useless_type_conversion_p (TREE_TYPE (stmt), TREE_TYPE (TREE_OPERAND (stmt, 1)))) { TREE_OPERAND (stmt, 1) = fold_convert (type_left, TREE_OPERAND (stmt, 1)); gcc_assert (useless_type_conversion_p (TREE_TYPE (stmt), type_left)); } if (type_right && !useless_type_conversion_p (TREE_TYPE (stmt), TREE_TYPE (TREE_OPERAND (stmt, 2)))) { TREE_OPERAND (stmt, 2) = fold_convert (type_right, TREE_OPERAND (stmt, 2)); gcc_assert (useless_type_conversion_p (TREE_TYPE (stmt), type_right)); } } else if (TREE_CODE (stmt) == BIND_EXPR) { if (__builtin_expect (wtd->omp_ctx != NULL, 0)) { tree decl; for (decl = BIND_EXPR_VARS (stmt); decl; decl = DECL_CHAIN (decl)) if (TREE_CODE (decl) == VAR_DECL && !DECL_EXTERNAL (decl) && omp_var_to_track (decl)) { splay_tree_node n = splay_tree_lookup (wtd->omp_ctx->variables, (splay_tree_key) decl); if (n == NULL) splay_tree_insert (wtd->omp_ctx->variables, (splay_tree_key) decl, TREE_STATIC (decl) ? OMP_CLAUSE_DEFAULT_SHARED : OMP_CLAUSE_DEFAULT_PRIVATE); } } VEC_safe_push (tree, heap, wtd->bind_expr_stack, stmt); cp_walk_tree (&BIND_EXPR_BODY (stmt), cp_genericize_r, data, NULL); VEC_pop (tree, wtd->bind_expr_stack); } else if (TREE_CODE (stmt) == USING_STMT) { tree block = NULL_TREE; /* Get the innermost inclosing GIMPLE_BIND that has a non NULL BLOCK, and append an IMPORTED_DECL to its BLOCK_VARS chained list. */ if (wtd->bind_expr_stack) { int i; for (i = VEC_length (tree, wtd->bind_expr_stack) - 1; i >= 0; i--) if ((block = BIND_EXPR_BLOCK (VEC_index (tree, wtd->bind_expr_stack, i)))) break; } if (block) { tree using_directive; gcc_assert (TREE_OPERAND (stmt, 0)); using_directive = make_node (IMPORTED_DECL); TREE_TYPE (using_directive) = void_type_node; IMPORTED_DECL_ASSOCIATED_DECL (using_directive) = TREE_OPERAND (stmt, 0); DECL_CHAIN (using_directive) = BLOCK_VARS (block); BLOCK_VARS (block) = using_directive; } /* The USING_STMT won't appear in GENERIC. */ *stmt_p = build1 (NOP_EXPR, void_type_node, integer_zero_node); *walk_subtrees = 0; } else if (TREE_CODE (stmt) == DECL_EXPR && TREE_CODE (DECL_EXPR_DECL (stmt)) == USING_DECL) { /* Using decls inside DECL_EXPRs are just dropped on the floor. */ *stmt_p = build1 (NOP_EXPR, void_type_node, integer_zero_node); *walk_subtrees = 0; } else if (TREE_CODE (stmt) == OMP_PARALLEL || TREE_CODE (stmt) == OMP_TASK) { struct cp_genericize_omp_taskreg omp_ctx; tree c, decl; splay_tree_node n; *walk_subtrees = 0; cp_walk_tree (&OMP_CLAUSES (stmt), cp_genericize_r, data, NULL); omp_ctx.is_parallel = TREE_CODE (stmt) == OMP_PARALLEL; omp_ctx.default_shared = omp_ctx.is_parallel; omp_ctx.outer = wtd->omp_ctx; omp_ctx.variables = splay_tree_new (splay_tree_compare_decl_uid, 0, 0); wtd->omp_ctx = &omp_ctx; for (c = OMP_CLAUSES (stmt); c; c = OMP_CLAUSE_CHAIN (c)) switch (OMP_CLAUSE_CODE (c)) { case OMP_CLAUSE_SHARED: case OMP_CLAUSE_PRIVATE: case OMP_CLAUSE_FIRSTPRIVATE: case OMP_CLAUSE_LASTPRIVATE: decl = OMP_CLAUSE_DECL (c); if (decl == error_mark_node || !omp_var_to_track (decl)) break; n = splay_tree_lookup (omp_ctx.variables, (splay_tree_key) decl); if (n != NULL) break; splay_tree_insert (omp_ctx.variables, (splay_tree_key) decl, OMP_CLAUSE_CODE (c) == OMP_CLAUSE_SHARED ? OMP_CLAUSE_DEFAULT_SHARED : OMP_CLAUSE_DEFAULT_PRIVATE); if (OMP_CLAUSE_CODE (c) != OMP_CLAUSE_PRIVATE && omp_ctx.outer) omp_cxx_notice_variable (omp_ctx.outer, decl); break; case OMP_CLAUSE_DEFAULT: if (OMP_CLAUSE_DEFAULT_KIND (c) == OMP_CLAUSE_DEFAULT_SHARED) omp_ctx.default_shared = true; default: break; } cp_walk_tree (&OMP_BODY (stmt), cp_genericize_r, data, NULL); wtd->omp_ctx = omp_ctx.outer; splay_tree_delete (omp_ctx.variables); } else if (TREE_CODE (stmt) == CONVERT_EXPR) gcc_assert (!CONVERT_EXPR_VBASE_PATH (stmt)); pointer_set_insert (p_set, *stmt_p); return NULL; } void cp_genericize (tree fndecl) { tree t; struct cp_genericize_data wtd; /* Fix up the types of parms passed by invisible reference. */ for (t = DECL_ARGUMENTS (fndecl); t; t = DECL_CHAIN (t)) if (TREE_ADDRESSABLE (TREE_TYPE (t))) { /* If a function's arguments are copied to create a thunk, then DECL_BY_REFERENCE will be set -- but the type of the argument will be a pointer type, so we will never get here. */ gcc_assert (!DECL_BY_REFERENCE (t)); gcc_assert (DECL_ARG_TYPE (t) != TREE_TYPE (t)); TREE_TYPE (t) = DECL_ARG_TYPE (t); DECL_BY_REFERENCE (t) = 1; TREE_ADDRESSABLE (t) = 0; relayout_decl (t); } /* Do the same for the return value. */ if (TREE_ADDRESSABLE (TREE_TYPE (DECL_RESULT (fndecl)))) { t = DECL_RESULT (fndecl); TREE_TYPE (t) = build_reference_type (TREE_TYPE (t)); DECL_BY_REFERENCE (t) = 1; TREE_ADDRESSABLE (t) = 0; relayout_decl (t); if (DECL_NAME (t)) { /* Adjust DECL_VALUE_EXPR of the original var. */ tree outer = outer_curly_brace_block (current_function_decl); tree var; if (outer) for (var = BLOCK_VARS (outer); var; var = DECL_CHAIN (var)) if (DECL_NAME (t) == DECL_NAME (var) && DECL_HAS_VALUE_EXPR_P (var) && DECL_VALUE_EXPR (var) == t) { tree val = convert_from_reference (t); SET_DECL_VALUE_EXPR (var, val); break; } } } /* If we're a clone, the body is already GIMPLE. */ if (DECL_CLONED_FUNCTION_P (fndecl)) return; /* We do want to see every occurrence of the parms, so we can't just use walk_tree's hash functionality. */ wtd.p_set = pointer_set_create (); wtd.bind_expr_stack = NULL; wtd.omp_ctx = NULL; cp_walk_tree (&DECL_SAVED_TREE (fndecl), cp_genericize_r, &wtd, NULL); pointer_set_destroy (wtd.p_set); VEC_free (tree, heap, wtd.bind_expr_stack); /* Do everything else. */ c_genericize (fndecl); gcc_assert (bc_label[bc_break] == NULL); gcc_assert (bc_label[bc_continue] == NULL); } /* Build code to apply FN to each member of ARG1 and ARG2. FN may be NULL if there is in fact nothing to do. ARG2 may be null if FN actually only takes one argument. */ static tree cxx_omp_clause_apply_fn (tree fn, tree arg1, tree arg2) { tree defparm, parm, t; int i = 0; int nargs; tree *argarray; if (fn == NULL) return NULL; nargs = list_length (DECL_ARGUMENTS (fn)); argarray = XALLOCAVEC (tree, nargs); defparm = TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (fn))); if (arg2) defparm = TREE_CHAIN (defparm); if (TREE_CODE (TREE_TYPE (arg1)) == ARRAY_TYPE) { tree inner_type = TREE_TYPE (arg1); tree start1, end1, p1; tree start2 = NULL, p2 = NULL; tree ret = NULL, lab; start1 = arg1; start2 = arg2; do { inner_type = TREE_TYPE (inner_type); start1 = build4 (ARRAY_REF, inner_type, start1, size_zero_node, NULL, NULL); if (arg2) start2 = build4 (ARRAY_REF, inner_type, start2, size_zero_node, NULL, NULL); } while (TREE_CODE (inner_type) == ARRAY_TYPE); start1 = build_fold_addr_expr_loc (input_location, start1); if (arg2) start2 = build_fold_addr_expr_loc (input_location, start2); end1 = TYPE_SIZE_UNIT (TREE_TYPE (arg1)); end1 = fold_build_pointer_plus (start1, end1); p1 = create_tmp_var (TREE_TYPE (start1), NULL); t = build2 (MODIFY_EXPR, TREE_TYPE (p1), p1, start1); append_to_statement_list (t, &ret); if (arg2) { p2 = create_tmp_var (TREE_TYPE (start2), NULL); t = build2 (MODIFY_EXPR, TREE_TYPE (p2), p2, start2); append_to_statement_list (t, &ret); } lab = create_artificial_label (input_location); t = build1 (LABEL_EXPR, void_type_node, lab); append_to_statement_list (t, &ret); argarray[i++] = p1; if (arg2) argarray[i++] = p2; /* Handle default arguments. */ for (parm = defparm; parm && parm != void_list_node; parm = TREE_CHAIN (parm), i++) argarray[i] = convert_default_arg (TREE_VALUE (parm), TREE_PURPOSE (parm), fn, i); t = build_call_a (fn, i, argarray); t = fold_convert (void_type_node, t); t = fold_build_cleanup_point_expr (TREE_TYPE (t), t); append_to_statement_list (t, &ret); t = fold_build_pointer_plus (p1, TYPE_SIZE_UNIT (inner_type)); t = build2 (MODIFY_EXPR, TREE_TYPE (p1), p1, t); append_to_statement_list (t, &ret); if (arg2) { t = fold_build_pointer_plus (p2, TYPE_SIZE_UNIT (inner_type)); t = build2 (MODIFY_EXPR, TREE_TYPE (p2), p2, t); append_to_statement_list (t, &ret); } t = build2 (NE_EXPR, boolean_type_node, p1, end1); t = build3 (COND_EXPR, void_type_node, t, build_and_jump (&lab), NULL); append_to_statement_list (t, &ret); return ret; } else { argarray[i++] = build_fold_addr_expr_loc (input_location, arg1); if (arg2) argarray[i++] = build_fold_addr_expr_loc (input_location, arg2); /* Handle default arguments. */ for (parm = defparm; parm && parm != void_list_node; parm = TREE_CHAIN (parm), i++) argarray[i] = convert_default_arg (TREE_VALUE (parm), TREE_PURPOSE (parm), fn, i); t = build_call_a (fn, i, argarray); t = fold_convert (void_type_node, t); return fold_build_cleanup_point_expr (TREE_TYPE (t), t); } } /* Return code to initialize DECL with its default constructor, or NULL if there's nothing to do. */ tree cxx_omp_clause_default_ctor (tree clause, tree decl, tree outer ATTRIBUTE_UNUSED) { tree info = CP_OMP_CLAUSE_INFO (clause); tree ret = NULL; if (info) ret = cxx_omp_clause_apply_fn (TREE_VEC_ELT (info, 0), decl, NULL); return ret; } /* Return code to initialize DST with a copy constructor from SRC. */ tree cxx_omp_clause_copy_ctor (tree clause, tree dst, tree src) { tree info = CP_OMP_CLAUSE_INFO (clause); tree ret = NULL; if (info) ret = cxx_omp_clause_apply_fn (TREE_VEC_ELT (info, 0), dst, src); if (ret == NULL) ret = build2 (MODIFY_EXPR, TREE_TYPE (dst), dst, src); return ret; } /* Similarly, except use an assignment operator instead. */ tree cxx_omp_clause_assign_op (tree clause, tree dst, tree src) { tree info = CP_OMP_CLAUSE_INFO (clause); tree ret = NULL; if (info) ret = cxx_omp_clause_apply_fn (TREE_VEC_ELT (info, 2), dst, src); if (ret == NULL) ret = build2 (MODIFY_EXPR, TREE_TYPE (dst), dst, src); return ret; } /* Return code to destroy DECL. */ tree cxx_omp_clause_dtor (tree clause, tree decl) { tree info = CP_OMP_CLAUSE_INFO (clause); tree ret = NULL; if (info) ret = cxx_omp_clause_apply_fn (TREE_VEC_ELT (info, 1), decl, NULL); return ret; } /* True if OpenMP should privatize what this DECL points to rather than the DECL itself. */ bool cxx_omp_privatize_by_reference (const_tree decl) { return is_invisiref_parm (decl); } /* Return true if DECL is const qualified var having no mutable member. */ bool cxx_omp_const_qual_no_mutable (tree decl) { tree type = TREE_TYPE (decl); if (TREE_CODE (type) == REFERENCE_TYPE) { if (!is_invisiref_parm (decl)) return false; type = TREE_TYPE (type); if (TREE_CODE (decl) == RESULT_DECL && DECL_NAME (decl)) { /* NVR doesn't preserve const qualification of the variable's type. */ tree outer = outer_curly_brace_block (current_function_decl); tree var; if (outer) for (var = BLOCK_VARS (outer); var; var = DECL_CHAIN (var)) if (DECL_NAME (decl) == DECL_NAME (var) && (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (var)))) { if (TYPE_READONLY (TREE_TYPE (var))) type = TREE_TYPE (var); break; } } } if (type == error_mark_node) return false; /* Variables with const-qualified type having no mutable member are predetermined shared. */ if (TYPE_READONLY (type) && !cp_has_mutable_p (type)) return true; return false; } /* True if OpenMP sharing attribute of DECL is predetermined. */ enum omp_clause_default_kind cxx_omp_predetermined_sharing (tree decl) { /* Static data members are predetermined shared. */ if (TREE_STATIC (decl)) { tree ctx = CP_DECL_CONTEXT (decl); if (TYPE_P (ctx) && MAYBE_CLASS_TYPE_P (ctx)) return OMP_CLAUSE_DEFAULT_SHARED; } /* Const qualified vars having no mutable member are predetermined shared. */ if (cxx_omp_const_qual_no_mutable (decl)) return OMP_CLAUSE_DEFAULT_SHARED; return OMP_CLAUSE_DEFAULT_UNSPECIFIED; } /* Finalize an implicitly determined clause. */ void cxx_omp_finish_clause (tree c) { tree decl, inner_type; bool make_shared = false; if (OMP_CLAUSE_CODE (c) != OMP_CLAUSE_FIRSTPRIVATE) return; decl = OMP_CLAUSE_DECL (c); decl = require_complete_type (decl); inner_type = TREE_TYPE (decl); if (decl == error_mark_node) make_shared = true; else if (TREE_CODE (TREE_TYPE (decl)) == REFERENCE_TYPE) { if (is_invisiref_parm (decl)) inner_type = TREE_TYPE (inner_type); else { error ("%qE implicitly determined as %<firstprivate%> has reference type", decl); make_shared = true; } } /* We're interested in the base element, not arrays. */ while (TREE_CODE (inner_type) == ARRAY_TYPE) inner_type = TREE_TYPE (inner_type); /* Check for special function availability by building a call to one. Save the results, because later we won't be in the right context for making these queries. */ if (!make_shared && CLASS_TYPE_P (inner_type) && cxx_omp_create_clause_info (c, inner_type, false, true, false)) make_shared = true; if (make_shared) OMP_CLAUSE_CODE (c) = OMP_CLAUSE_SHARED; }