/* Perform the semantic phase of parsing, i.e., the process of building tree structure, checking semantic consistency, and building RTL. These routines are used both during actual parsing and during the instantiation of template functions. Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. Written by Mark Mitchell (mmitchell@usa.net) based on code found formerly in parse.y and pt.c. 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 2, 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 COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "tree.h" #include "cp-tree.h" #include "tree-inline.h" #include "except.h" #include "lex.h" #include "toplev.h" #include "flags.h" #include "rtl.h" #include "expr.h" #include "output.h" #include "timevar.h" #include "debug.h" #include "cgraph.h" /* There routines provide a modular interface to perform many parsing operations. They may therefore be used during actual parsing, or during template instantiation, which may be regarded as a degenerate form of parsing. Since the current g++ parser is lacking in several respects, and will be reimplemented, we are attempting to move most code that is not directly related to parsing into this file; that will make implementing the new parser much easier since it will be able to make use of these routines. */ static tree maybe_convert_cond (tree); static tree simplify_aggr_init_exprs_r (tree *, int *, void *); static void emit_associated_thunks (tree); static void genrtl_try_block (tree); static void genrtl_eh_spec_block (tree); static void genrtl_handler (tree); static void cp_expand_stmt (tree); /* Finish processing the COND, the SUBSTMT condition for STMT. */ #define FINISH_COND(COND, STMT, SUBSTMT) \ do { \ if (last_tree != (STMT)) \ { \ RECHAIN_STMTS (STMT, SUBSTMT); \ if (!processing_template_decl) \ { \ (COND) = build_tree_list (SUBSTMT, COND); \ (SUBSTMT) = (COND); \ } \ } \ else \ (SUBSTMT) = (COND); \ } while (0) /* Deferred Access Checking Overview --------------------------------- Most C++ expressions and declarations require access checking to be performed during parsing. However, in several cases, this has to be treated differently. For member declarations, access checking has to be deferred until more information about the declaration is known. For example: class A { typedef int X; public: X f(); }; A::X A::f(); A::X g(); When we are parsing the function return type `A::X', we don't really know if this is allowed until we parse the function name. Furthermore, some contexts require that access checking is never performed at all. These include class heads, and template instantiations. Typical use of access checking functions is described here: 1. When we enter a context that requires certain access checking mode, the function `push_deferring_access_checks' is called with DEFERRING argument specifying the desired mode. Access checking may be performed immediately (dk_no_deferred), deferred (dk_deferred), or not performed (dk_no_check). 2. When a declaration such as a type, or a variable, is encountered, the function `perform_or_defer_access_check' is called. It maintains a TREE_LIST of all deferred checks. 3. The global `current_class_type' or `current_function_decl' is then setup by the parser. `enforce_access' relies on these information to check access. 4. Upon exiting the context mentioned in step 1, `perform_deferred_access_checks' is called to check all declaration stored in the TREE_LIST. `pop_deferring_access_checks' is then called to restore the previous access checking mode. In case of parsing error, we simply call `pop_deferring_access_checks' without `perform_deferred_access_checks'. */ /* Data for deferred access checking. */ static GTY(()) deferred_access *deferred_access_stack; static GTY(()) deferred_access *deferred_access_free_list; /* Save the current deferred access states and start deferred access checking iff DEFER_P is true. */ void push_deferring_access_checks (deferring_kind deferring) { deferred_access *d; /* For context like template instantiation, access checking disabling applies to all nested context. */ if (deferred_access_stack && deferred_access_stack->deferring_access_checks_kind == dk_no_check) deferring = dk_no_check; /* Recycle previously used free store if available. */ if (deferred_access_free_list) { d = deferred_access_free_list; deferred_access_free_list = d->next; } else d = ggc_alloc (sizeof (deferred_access)); d->next = deferred_access_stack; d->deferred_access_checks = NULL_TREE; d->deferring_access_checks_kind = deferring; deferred_access_stack = d; } /* Resume deferring access checks again after we stopped doing this previously. */ void resume_deferring_access_checks (void) { if (deferred_access_stack->deferring_access_checks_kind == dk_no_deferred) deferred_access_stack->deferring_access_checks_kind = dk_deferred; } /* Stop deferring access checks. */ void stop_deferring_access_checks (void) { if (deferred_access_stack->deferring_access_checks_kind == dk_deferred) deferred_access_stack->deferring_access_checks_kind = dk_no_deferred; } /* Discard the current deferred access checks and restore the previous states. */ void pop_deferring_access_checks (void) { deferred_access *d = deferred_access_stack; deferred_access_stack = d->next; /* Remove references to access checks TREE_LIST. */ d->deferred_access_checks = NULL_TREE; /* Store in free list for later use. */ d->next = deferred_access_free_list; deferred_access_free_list = d; } /* Returns a TREE_LIST representing the deferred checks. The TREE_PURPOSE of each node is the type through which the access occurred; the TREE_VALUE is the declaration named. */ tree get_deferred_access_checks (void) { return deferred_access_stack->deferred_access_checks; } /* Take current deferred checks and combine with the previous states if we also defer checks previously. Otherwise perform checks now. */ void pop_to_parent_deferring_access_checks (void) { tree deferred_check = get_deferred_access_checks (); deferred_access *d1 = deferred_access_stack; deferred_access *d2 = deferred_access_stack->next; deferred_access *d3 = deferred_access_stack->next->next; /* Temporary swap the order of the top two states, just to make sure the garbage collector will not reclaim the memory during processing below. */ deferred_access_stack = d2; d2->next = d1; d1->next = d3; for ( ; deferred_check; deferred_check = TREE_CHAIN (deferred_check)) /* Perform deferred check if required. */ perform_or_defer_access_check (TREE_PURPOSE (deferred_check), TREE_VALUE (deferred_check)); deferred_access_stack = d1; d1->next = d2; d2->next = d3; pop_deferring_access_checks (); } /* Perform the deferred access checks. After performing the checks, we still have to keep the list `deferred_access_stack->deferred_access_checks' since we may want to check access for them again later in a different context. For example: class A { typedef int X; static X a; }; A::X A::a, x; // No error for `A::a', error for `x' We have to perform deferred access of `A::X', first with `A::a', next with `x'. */ void perform_deferred_access_checks (void) { tree deferred_check; for (deferred_check = deferred_access_stack->deferred_access_checks; deferred_check; deferred_check = TREE_CHAIN (deferred_check)) /* Check access. */ enforce_access (TREE_PURPOSE (deferred_check), TREE_VALUE (deferred_check)); } /* Defer checking the accessibility of DECL, when looked up in BINFO. */ void perform_or_defer_access_check (tree binfo, tree decl) { tree check; my_friendly_assert (TREE_CODE (binfo) == TREE_VEC, 20030623); /* If we are not supposed to defer access checks, just check now. */ if (deferred_access_stack->deferring_access_checks_kind == dk_no_deferred) { enforce_access (binfo, decl); return; } /* Exit if we are in a context that no access checking is performed. */ else if (deferred_access_stack->deferring_access_checks_kind == dk_no_check) return; /* See if we are already going to perform this check. */ for (check = deferred_access_stack->deferred_access_checks; check; check = TREE_CHAIN (check)) if (TREE_VALUE (check) == decl && TREE_PURPOSE (check) == binfo) return; /* If not, record the check. */ deferred_access_stack->deferred_access_checks = tree_cons (binfo, decl, deferred_access_stack->deferred_access_checks); } /* Returns nonzero if the current statement is a full expression, i.e. temporaries created during that statement should be destroyed at the end of the statement. */ int stmts_are_full_exprs_p (void) { return current_stmt_tree ()->stmts_are_full_exprs_p; } /* Returns the stmt_tree (if any) to which statements are currently being added. If there is no active statement-tree, NULL is returned. */ stmt_tree current_stmt_tree (void) { return (cfun ? &cfun->language->base.x_stmt_tree : &scope_chain->x_stmt_tree); } /* Nonzero if TYPE is an anonymous union or struct type. We have to use a flag for this because "A union for which objects or pointers are declared is not an anonymous union" [class.union]. */ int anon_aggr_type_p (tree node) { return ANON_AGGR_TYPE_P (node); } /* Finish a scope. */ tree do_poplevel (void) { tree block = NULL_TREE; if (stmts_are_full_exprs_p ()) { tree scope_stmts = NULL_TREE; block = poplevel (kept_level_p (), 1, 0); if (!processing_template_decl) { /* This needs to come after the poplevel so that partial scopes are properly nested. */ scope_stmts = add_scope_stmt (/*begin_p=*/0, /*partial_p=*/0); if (block) { SCOPE_STMT_BLOCK (TREE_PURPOSE (scope_stmts)) = block; SCOPE_STMT_BLOCK (TREE_VALUE (scope_stmts)) = block; } } } return block; } /* Begin a new scope. */ void do_pushlevel (scope_kind sk) { if (stmts_are_full_exprs_p ()) { if (!processing_template_decl) add_scope_stmt (/*begin_p=*/1, /*partial_p=*/0); begin_scope (sk, NULL); } } /* Finish a goto-statement. */ tree finish_goto_stmt (tree destination) { if (TREE_CODE (destination) == IDENTIFIER_NODE) destination = lookup_label (destination); /* We warn about unused labels with -Wunused. That means we have to mark the used labels as used. */ if (TREE_CODE (destination) == LABEL_DECL) TREE_USED (destination) = 1; else { /* The DESTINATION is being used as an rvalue. */ if (!processing_template_decl) destination = decay_conversion (destination); /* We don't inline calls to functions with computed gotos. Those functions are typically up to some funny business, and may be depending on the labels being at particular addresses, or some such. */ DECL_UNINLINABLE (current_function_decl) = 1; } check_goto (destination); return add_stmt (build_stmt (GOTO_STMT, destination)); } /* COND is the condition-expression for an if, while, etc., statement. Convert it to a boolean value, if appropriate. */ static tree maybe_convert_cond (tree cond) { /* Empty conditions remain empty. */ if (!cond) return NULL_TREE; /* Wait until we instantiate templates before doing conversion. */ if (processing_template_decl) return cond; /* Do the conversion. */ cond = convert_from_reference (cond); return condition_conversion (cond); } /* Finish an expression-statement, whose EXPRESSION is as indicated. */ tree finish_expr_stmt (tree expr) { tree r = NULL_TREE; if (expr != NULL_TREE) { if (!processing_template_decl) expr = convert_to_void (expr, "statement"); else if (!type_dependent_expression_p (expr)) convert_to_void (build_non_dependent_expr (expr), "statement"); r = add_stmt (build_stmt (EXPR_STMT, expr)); } finish_stmt (); return r; } /* Begin an if-statement. Returns a newly created IF_STMT if appropriate. */ tree begin_if_stmt (void) { tree r; do_pushlevel (sk_block); r = build_stmt (IF_STMT, NULL_TREE, NULL_TREE, NULL_TREE); add_stmt (r); return r; } /* Process the COND of an if-statement, which may be given by IF_STMT. */ void finish_if_stmt_cond (tree cond, tree if_stmt) { cond = maybe_convert_cond (cond); FINISH_COND (cond, if_stmt, IF_COND (if_stmt)); } /* Finish the then-clause of an if-statement, which may be given by IF_STMT. */ tree finish_then_clause (tree if_stmt) { RECHAIN_STMTS (if_stmt, THEN_CLAUSE (if_stmt)); return if_stmt; } /* Begin the else-clause of an if-statement. */ void begin_else_clause (void) { } /* Finish the else-clause of an if-statement, which may be given by IF_STMT. */ void finish_else_clause (tree if_stmt) { RECHAIN_STMTS (if_stmt, ELSE_CLAUSE (if_stmt)); } /* Finish an if-statement. */ void finish_if_stmt (void) { finish_stmt (); do_poplevel (); } /* Begin a while-statement. Returns a newly created WHILE_STMT if appropriate. */ tree begin_while_stmt (void) { tree r; r = build_stmt (WHILE_STMT, NULL_TREE, NULL_TREE); add_stmt (r); do_pushlevel (sk_block); return r; } /* Process the COND of a while-statement, which may be given by WHILE_STMT. */ void finish_while_stmt_cond (tree cond, tree while_stmt) { cond = maybe_convert_cond (cond); if (processing_template_decl) /* Don't mess with condition decls in a template. */ FINISH_COND (cond, while_stmt, WHILE_COND (while_stmt)); else if (getdecls () == NULL_TREE) /* It was a simple condition; install it. */ WHILE_COND (while_stmt) = cond; else { /* If there was a declaration in the condition, we can't leave it there; transform while (A x = 42) { } to while (true) { A x = 42; if (!x) break; } */ tree if_stmt; WHILE_COND (while_stmt) = boolean_true_node; if_stmt = begin_if_stmt (); cond = build_unary_op (TRUTH_NOT_EXPR, cond, 0); finish_if_stmt_cond (cond, if_stmt); finish_break_stmt (); finish_then_clause (if_stmt); finish_if_stmt (); } } /* Finish a while-statement, which may be given by WHILE_STMT. */ void finish_while_stmt (tree while_stmt) { do_poplevel (); RECHAIN_STMTS (while_stmt, WHILE_BODY (while_stmt)); finish_stmt (); } /* Begin a do-statement. Returns a newly created DO_STMT if appropriate. */ tree begin_do_stmt (void) { tree r = build_stmt (DO_STMT, NULL_TREE, NULL_TREE); add_stmt (r); return r; } /* Finish the body of a do-statement, which may be given by DO_STMT. */ void finish_do_body (tree do_stmt) { RECHAIN_STMTS (do_stmt, DO_BODY (do_stmt)); } /* Finish a do-statement, which may be given by DO_STMT, and whose COND is as indicated. */ void finish_do_stmt (tree cond, tree do_stmt) { cond = maybe_convert_cond (cond); DO_COND (do_stmt) = cond; finish_stmt (); } /* Finish a return-statement. The EXPRESSION returned, if any, is as indicated. */ tree finish_return_stmt (tree expr) { tree r; expr = check_return_expr (expr); if (!processing_template_decl) { if (DECL_DESTRUCTOR_P (current_function_decl)) { /* Similarly, all destructors must run destructors for base-classes before returning. So, all returns in a destructor get sent to the DTOR_LABEL; finish_function emits code to return a value there. */ return finish_goto_stmt (dtor_label); } } r = add_stmt (build_stmt (RETURN_STMT, expr)); finish_stmt (); return r; } /* Begin a for-statement. Returns a new FOR_STMT if appropriate. */ tree begin_for_stmt (void) { tree r; r = build_stmt (FOR_STMT, NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE); NEW_FOR_SCOPE_P (r) = flag_new_for_scope > 0; if (NEW_FOR_SCOPE_P (r)) do_pushlevel (sk_for); add_stmt (r); return r; } /* Finish the for-init-statement of a for-statement, which may be given by FOR_STMT. */ void finish_for_init_stmt (tree for_stmt) { if (last_tree != for_stmt) RECHAIN_STMTS (for_stmt, FOR_INIT_STMT (for_stmt)); do_pushlevel (sk_block); } /* Finish the COND of a for-statement, which may be given by FOR_STMT. */ void finish_for_cond (tree cond, tree for_stmt) { cond = maybe_convert_cond (cond); if (processing_template_decl) /* Don't mess with condition decls in a template. */ FINISH_COND (cond, for_stmt, FOR_COND (for_stmt)); else if (getdecls () == NULL_TREE) /* It was a simple condition; install it. */ FOR_COND (for_stmt) = cond; else { /* If there was a declaration in the condition, we can't leave it there; transform for (; A x = 42;) { } to for (;;) { A x = 42; if (!x) break; } */ tree if_stmt; FOR_COND (for_stmt) = NULL_TREE; if_stmt = begin_if_stmt (); cond = build_unary_op (TRUTH_NOT_EXPR, cond, 0); finish_if_stmt_cond (cond, if_stmt); finish_break_stmt (); finish_then_clause (if_stmt); finish_if_stmt (); } } /* Finish the increment-EXPRESSION in a for-statement, which may be given by FOR_STMT. */ void finish_for_expr (tree expr, tree for_stmt) { /* If EXPR is an overloaded function, issue an error; there is no context available to use to perform overload resolution. */ if (expr && type_unknown_p (expr)) { cxx_incomplete_type_error (expr, TREE_TYPE (expr)); expr = error_mark_node; } FOR_EXPR (for_stmt) = expr; } /* Finish the body of a for-statement, which may be given by FOR_STMT. The increment-EXPR for the loop must be provided. */ void finish_for_stmt (tree for_stmt) { /* Pop the scope for the body of the loop. */ do_poplevel (); RECHAIN_STMTS (for_stmt, FOR_BODY (for_stmt)); if (NEW_FOR_SCOPE_P (for_stmt)) do_poplevel (); finish_stmt (); } /* Finish a break-statement. */ tree finish_break_stmt (void) { return add_stmt (build_break_stmt ()); } /* Finish a continue-statement. */ tree finish_continue_stmt (void) { return add_stmt (build_continue_stmt ()); } /* Begin a switch-statement. Returns a new SWITCH_STMT if appropriate. */ tree begin_switch_stmt (void) { tree r; do_pushlevel (sk_block); r = build_stmt (SWITCH_STMT, NULL_TREE, NULL_TREE, NULL_TREE); add_stmt (r); return r; } /* Finish the cond of a switch-statement. */ void finish_switch_cond (tree cond, tree switch_stmt) { tree orig_type = NULL; if (!processing_template_decl) { tree index; /* Convert the condition to an integer or enumeration type. */ cond = build_expr_type_conversion (WANT_INT | WANT_ENUM, cond, true); if (cond == NULL_TREE) { error ("switch quantity not an integer"); cond = error_mark_node; } orig_type = TREE_TYPE (cond); if (cond != error_mark_node) { /* [stmt.switch] Integral promotions are performed. */ cond = perform_integral_promotions (cond); cond = fold (build1 (CLEANUP_POINT_EXPR, TREE_TYPE (cond), cond)); } if (cond != error_mark_node) { index = get_unwidened (cond, NULL_TREE); /* We can't strip a conversion from a signed type to an unsigned, because if we did, int_fits_type_p would do the wrong thing when checking case values for being in range, and it's too hard to do the right thing. */ if (TREE_UNSIGNED (TREE_TYPE (cond)) == TREE_UNSIGNED (TREE_TYPE (index))) cond = index; } } FINISH_COND (cond, switch_stmt, SWITCH_COND (switch_stmt)); SWITCH_TYPE (switch_stmt) = orig_type; push_switch (switch_stmt); } /* Finish the body of a switch-statement, which may be given by SWITCH_STMT. The COND to switch on is indicated. */ void finish_switch_stmt (tree switch_stmt) { RECHAIN_STMTS (switch_stmt, SWITCH_BODY (switch_stmt)); pop_switch (); finish_stmt (); do_poplevel (); } /* Generate the RTL for T, which is a TRY_BLOCK. */ static void genrtl_try_block (tree t) { if (CLEANUP_P (t)) { expand_eh_region_start (); expand_stmt (TRY_STMTS (t)); expand_eh_region_end_cleanup (TRY_HANDLERS (t)); } else { if (!FN_TRY_BLOCK_P (t)) emit_line_note (input_location); expand_eh_region_start (); expand_stmt (TRY_STMTS (t)); if (FN_TRY_BLOCK_P (t)) { expand_start_all_catch (); in_function_try_handler = 1; expand_stmt (TRY_HANDLERS (t)); in_function_try_handler = 0; expand_end_all_catch (); } else { expand_start_all_catch (); expand_stmt (TRY_HANDLERS (t)); expand_end_all_catch (); } } } /* Generate the RTL for T, which is an EH_SPEC_BLOCK. */ static void genrtl_eh_spec_block (tree t) { expand_eh_region_start (); expand_stmt (EH_SPEC_STMTS (t)); expand_eh_region_end_allowed (EH_SPEC_RAISES (t), build_call (call_unexpected_node, tree_cons (NULL_TREE, build_exc_ptr (), NULL_TREE))); } /* Begin a try-block. Returns a newly-created TRY_BLOCK if appropriate. */ tree begin_try_block (void) { tree r = build_stmt (TRY_BLOCK, NULL_TREE, NULL_TREE); add_stmt (r); return r; } /* Likewise, for a function-try-block. */ tree begin_function_try_block (void) { tree r = build_stmt (TRY_BLOCK, NULL_TREE, NULL_TREE); FN_TRY_BLOCK_P (r) = 1; add_stmt (r); return r; } /* Finish a try-block, which may be given by TRY_BLOCK. */ void finish_try_block (tree try_block) { RECHAIN_STMTS (try_block, TRY_STMTS (try_block)); } /* Finish the body of a cleanup try-block, which may be given by TRY_BLOCK. */ void finish_cleanup_try_block (tree try_block) { RECHAIN_STMTS (try_block, TRY_STMTS (try_block)); } /* Finish an implicitly generated try-block, with a cleanup is given by CLEANUP. */ void finish_cleanup (tree cleanup, tree try_block) { TRY_HANDLERS (try_block) = cleanup; CLEANUP_P (try_block) = 1; } /* Likewise, for a function-try-block. */ void finish_function_try_block (tree try_block) { if (TREE_CHAIN (try_block) && TREE_CODE (TREE_CHAIN (try_block)) == CTOR_INITIALIZER) { /* Chain the compound statement after the CTOR_INITIALIZER. */ TREE_CHAIN (TREE_CHAIN (try_block)) = last_tree; /* And make the CTOR_INITIALIZER the body of the try-block. */ RECHAIN_STMTS (try_block, TRY_STMTS (try_block)); } else RECHAIN_STMTS (try_block, TRY_STMTS (try_block)); in_function_try_handler = 1; } /* Finish a handler-sequence for a try-block, which may be given by TRY_BLOCK. */ void finish_handler_sequence (tree try_block) { RECHAIN_STMTS (try_block, TRY_HANDLERS (try_block)); check_handlers (TRY_HANDLERS (try_block)); } /* Likewise, for a function-try-block. */ void finish_function_handler_sequence (tree try_block) { in_function_try_handler = 0; RECHAIN_STMTS (try_block, TRY_HANDLERS (try_block)); check_handlers (TRY_HANDLERS (try_block)); } /* Generate the RTL for T, which is a HANDLER. */ static void genrtl_handler (tree t) { genrtl_do_pushlevel (); if (!processing_template_decl) expand_start_catch (HANDLER_TYPE (t)); expand_stmt (HANDLER_BODY (t)); if (!processing_template_decl) expand_end_catch (); } /* Begin a handler. Returns a HANDLER if appropriate. */ tree begin_handler (void) { tree r; r = build_stmt (HANDLER, NULL_TREE, NULL_TREE); add_stmt (r); /* Create a binding level for the eh_info and the exception object cleanup. */ do_pushlevel (sk_catch); return r; } /* Finish the handler-parameters for a handler, which may be given by HANDLER. DECL is the declaration for the catch parameter, or NULL if this is a `catch (...)' clause. */ void finish_handler_parms (tree decl, tree handler) { tree type = NULL_TREE; if (processing_template_decl) { if (decl) { decl = pushdecl (decl); decl = push_template_decl (decl); add_decl_stmt (decl); RECHAIN_STMTS (handler, HANDLER_PARMS (handler)); type = TREE_TYPE (decl); } } else type = expand_start_catch_block (decl); HANDLER_TYPE (handler) = type; if (!processing_template_decl && type) mark_used (eh_type_info (type)); } /* Finish a handler, which may be given by HANDLER. The BLOCKs are the return value from the matching call to finish_handler_parms. */ void finish_handler (tree handler) { if (!processing_template_decl) expand_end_catch_block (); do_poplevel (); RECHAIN_STMTS (handler, HANDLER_BODY (handler)); } /* Begin a compound-statement. If HAS_NO_SCOPE is true, the compound-statement does not define a scope. Returns a new COMPOUND_STMT. */ tree begin_compound_stmt (bool has_no_scope) { tree r; int is_try = 0; r = build_stmt (COMPOUND_STMT, NULL_TREE); if (last_tree && TREE_CODE (last_tree) == TRY_BLOCK) is_try = 1; add_stmt (r); if (has_no_scope) COMPOUND_STMT_NO_SCOPE (r) = 1; last_expr_type = NULL_TREE; if (!has_no_scope) do_pushlevel (is_try ? sk_try : sk_block); else /* Normally, we try hard to keep the BLOCK for a statement-expression. But, if it's a statement-expression with a scopeless block, there's nothing to keep, and we don't want to accidentally keep a block *inside* the scopeless block. */ keep_next_level (false); return r; } /* Finish a compound-statement, which is given by COMPOUND_STMT. */ tree finish_compound_stmt (tree compound_stmt) { tree r; tree t; if (COMPOUND_STMT_NO_SCOPE (compound_stmt)) r = NULL_TREE; else r = do_poplevel (); RECHAIN_STMTS (compound_stmt, COMPOUND_BODY (compound_stmt)); /* When we call finish_stmt we will lose LAST_EXPR_TYPE. But, since the precise purpose of that variable is store the type of the last expression statement within the last compound statement, we preserve the value. */ t = last_expr_type; finish_stmt (); last_expr_type = t; return r; } /* Finish an asm-statement, whose components are a CV_QUALIFIER, a STRING, some OUTPUT_OPERANDS, some INPUT_OPERANDS, and some CLOBBERS. */ tree finish_asm_stmt (tree cv_qualifier, tree string, tree output_operands, tree input_operands, tree clobbers) { tree r; tree t; if (cv_qualifier != NULL_TREE && cv_qualifier != ridpointers[(int) RID_VOLATILE]) { warning ("%s qualifier ignored on asm", IDENTIFIER_POINTER (cv_qualifier)); cv_qualifier = NULL_TREE; } if (!processing_template_decl) { int i; int ninputs; int noutputs; for (t = input_operands; t; t = TREE_CHAIN (t)) { tree converted_operand = decay_conversion (TREE_VALUE (t)); /* If the type of the operand hasn't been determined (e.g., because it involves an overloaded function), then issue an error message. There's no context available to resolve the overloading. */ if (TREE_TYPE (converted_operand) == unknown_type_node) { error ("type of asm operand `%E' could not be determined", TREE_VALUE (t)); converted_operand = error_mark_node; } TREE_VALUE (t) = converted_operand; } ninputs = list_length (input_operands); noutputs = list_length (output_operands); for (i = 0, t = output_operands; t; t = TREE_CHAIN (t), ++i) { bool allows_mem; bool allows_reg; bool is_inout; const char *constraint; tree operand; constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (t))); operand = TREE_VALUE (t); if (!parse_output_constraint (&constraint, i, ninputs, noutputs, &allows_mem, &allows_reg, &is_inout)) { /* By marking this operand as erroneous, we will not try to process this operand again in expand_asm_operands. */ TREE_VALUE (t) = error_mark_node; continue; } /* If the operand is a DECL that is going to end up in memory, assume it is addressable. This is a bit more conservative than it would ideally be; the exact test is buried deep in expand_asm_operands and depends on the DECL_RTL for the OPERAND -- which we don't have at this point. */ if (!allows_reg && DECL_P (operand)) cxx_mark_addressable (operand); } } r = build_stmt (ASM_STMT, cv_qualifier, string, output_operands, input_operands, clobbers); return add_stmt (r); } /* Finish a label with the indicated NAME. */ tree finish_label_stmt (tree name) { tree decl = define_label (input_location, name); return add_stmt (build_stmt (LABEL_STMT, decl)); } /* Finish a series of declarations for local labels. G++ allows users to declare "local" labels, i.e., labels with scope. This extension is useful when writing code involving statement-expressions. */ void finish_label_decl (tree name) { tree decl = declare_local_label (name); add_decl_stmt (decl); } /* When DECL goes out of scope, make sure that CLEANUP is executed. */ void finish_decl_cleanup (tree decl, tree cleanup) { add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup)); } /* If the current scope exits with an exception, run CLEANUP. */ void finish_eh_cleanup (tree cleanup) { tree r = build_stmt (CLEANUP_STMT, NULL_TREE, cleanup); CLEANUP_EH_ONLY (r) = 1; add_stmt (r); } /* The MEM_INITS is a list of mem-initializers, in reverse of the order they were written by the user. Each node is as for emit_mem_initializers. */ void finish_mem_initializers (tree mem_inits) { /* Reorder the MEM_INITS so that they are in the order they appeared in the source program. */ mem_inits = nreverse (mem_inits); if (processing_template_decl) add_stmt (build_min_nt (CTOR_INITIALIZER, mem_inits)); else emit_mem_initializers (mem_inits); } /* Returns the stack of SCOPE_STMTs for the current function. */ tree * current_scope_stmt_stack (void) { return &cfun->language->base.x_scope_stmt_stack; } /* Finish a parenthesized expression EXPR. */ tree finish_parenthesized_expr (tree expr) { if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (expr)))) /* This inhibits warnings in c_common_truthvalue_conversion. */ C_SET_EXP_ORIGINAL_CODE (expr, ERROR_MARK); if (TREE_CODE (expr) == OFFSET_REF) /* [expr.unary.op]/3 The qualified id of a pointer-to-member must not be enclosed in parentheses. */ PTRMEM_OK_P (expr) = 0; return expr; } /* Finish a reference to a non-static data member (DECL) that is not preceded by `.' or `->'. */ tree finish_non_static_data_member (tree decl, tree object, tree qualifying_scope) { my_friendly_assert (TREE_CODE (decl) == FIELD_DECL, 20020909); if (!object) { if (current_function_decl && DECL_STATIC_FUNCTION_P (current_function_decl)) cp_error_at ("invalid use of member `%D' in static member function", decl); else cp_error_at ("invalid use of non-static data member `%D'", decl); error ("from this location"); return error_mark_node; } TREE_USED (current_class_ptr) = 1; if (processing_template_decl && !qualifying_scope) { tree type = TREE_TYPE (decl); if (TREE_CODE (type) == REFERENCE_TYPE) type = TREE_TYPE (type); else { /* Set the cv qualifiers. */ int quals = cp_type_quals (TREE_TYPE (current_class_ref)); if (DECL_MUTABLE_P (decl)) quals &= ~TYPE_QUAL_CONST; quals |= cp_type_quals (TREE_TYPE (decl)); type = cp_build_qualified_type (type, quals); } return build_min (COMPONENT_REF, type, object, decl); } else { tree access_type = TREE_TYPE (object); tree lookup_context = context_for_name_lookup (decl); while (!DERIVED_FROM_P (lookup_context, access_type)) { access_type = TYPE_CONTEXT (access_type); while (access_type && DECL_P (access_type)) access_type = DECL_CONTEXT (access_type); if (!access_type) { cp_error_at ("object missing in reference to `%D'", decl); error ("from this location"); return error_mark_node; } } /* If PROCESSING_TEMPLATE_DECL is nonzero here, then QUALIFYING_SCOPE is also non-null. Wrap this in a SCOPE_REF for now. */ if (processing_template_decl) return build_min (SCOPE_REF, TREE_TYPE (decl), qualifying_scope, DECL_NAME (decl)); perform_or_defer_access_check (TYPE_BINFO (access_type), decl); /* If the data member was named `C::M', convert `*this' to `C' first. */ if (qualifying_scope) { tree binfo = NULL_TREE; object = build_scoped_ref (object, qualifying_scope, &binfo); } return build_class_member_access_expr (object, decl, /*access_path=*/NULL_TREE, /*preserve_reference=*/false); } } /* DECL was the declaration to which a qualified-id resolved. Issue an error message if it is not accessible. If OBJECT_TYPE is non-NULL, we have just seen `x->' or `x.' and OBJECT_TYPE is the type of `*x', or `x', respectively. If the DECL was named as `A::B' then NESTED_NAME_SPECIFIER is `A'. */ void check_accessibility_of_qualified_id (tree decl, tree object_type, tree nested_name_specifier) { tree scope; tree qualifying_type = NULL_TREE; /* Determine the SCOPE of DECL. */ scope = context_for_name_lookup (decl); /* If the SCOPE is not a type, then DECL is not a member. */ if (!TYPE_P (scope)) return; /* Compute the scope through which DECL is being accessed. */ if (object_type /* OBJECT_TYPE might not be a class type; consider: class A { typedef int I; }; I *p; p->A::I::~I(); In this case, we will have "A::I" as the DECL, but "I" as the OBJECT_TYPE. */ && CLASS_TYPE_P (object_type) && DERIVED_FROM_P (scope, object_type)) /* If we are processing a `->' or `.' expression, use the type of the left-hand side. */ qualifying_type = object_type; else if (nested_name_specifier) { /* If the reference is to a non-static member of the current class, treat it as if it were referenced through `this'. */ if (DECL_NONSTATIC_MEMBER_P (decl) && current_class_ptr && DERIVED_FROM_P (scope, current_class_type)) qualifying_type = current_class_type; /* Otherwise, use the type indicated by the nested-name-specifier. */ else qualifying_type = nested_name_specifier; } else /* Otherwise, the name must be from the current class or one of its bases. */ qualifying_type = currently_open_derived_class (scope); if (qualifying_type) perform_or_defer_access_check (TYPE_BINFO (qualifying_type), decl); } /* EXPR is the result of a qualified-id. The QUALIFYING_CLASS was the class named to the left of the "::" operator. DONE is true if this expression is a complete postfix-expression; it is false if this expression is followed by '->', '[', '(', etc. ADDRESS_P is true iff this expression is the operand of '&'. */ tree finish_qualified_id_expr (tree qualifying_class, tree expr, bool done, bool address_p) { if (error_operand_p (expr)) return error_mark_node; /* If EXPR occurs as the operand of '&', use special handling that permits a pointer-to-member. */ if (address_p && done) { if (TREE_CODE (expr) == SCOPE_REF) expr = TREE_OPERAND (expr, 1); expr = build_offset_ref (qualifying_class, expr, /*address_p=*/true); return expr; } if (TREE_CODE (expr) == FIELD_DECL) expr = finish_non_static_data_member (expr, current_class_ref, qualifying_class); else if (BASELINK_P (expr) && !processing_template_decl) { tree fns; /* See if any of the functions are non-static members. */ fns = BASELINK_FUNCTIONS (expr); if (TREE_CODE (fns) == TEMPLATE_ID_EXPR) fns = TREE_OPERAND (fns, 0); /* If so, the expression may be relative to the current class. */ if (!shared_member_p (fns) && current_class_type && DERIVED_FROM_P (qualifying_class, current_class_type)) expr = (build_class_member_access_expr (maybe_dummy_object (qualifying_class, NULL), expr, BASELINK_ACCESS_BINFO (expr), /*preserve_reference=*/false)); else if (done) /* The expression is a qualified name whose address is not being taken. */ expr = build_offset_ref (qualifying_class, expr, /*address_p=*/false); } return expr; } /* Begin a statement-expression. The value returned must be passed to finish_stmt_expr. */ tree begin_stmt_expr (void) { /* If we're outside a function, we won't have a statement-tree to work with. But, if we see a statement-expression we need to create one. */ if (! cfun && !last_tree) begin_stmt_tree (&scope_chain->x_saved_tree); last_expr_type = NULL_TREE; keep_next_level (true); return last_tree; } /* Process the final expression of a statement expression. EXPR can be NULL, if the final expression is empty. Build up a TARGET_EXPR so that the result value can be safely returned to the enclosing expression. */ tree finish_stmt_expr_expr (tree expr) { tree result = NULL_TREE; tree type = void_type_node; if (error_operand_p (expr)) return error_mark_node; if (expr) { type = TREE_TYPE (expr); if (!processing_template_decl && !VOID_TYPE_P (TREE_TYPE (expr))) { if (TREE_CODE (type) == ARRAY_TYPE || TREE_CODE (type) == FUNCTION_TYPE) expr = decay_conversion (expr); expr = convert_from_reference (expr); expr = require_complete_type (expr); /* Build a TARGET_EXPR for this aggregate. finish_stmt_expr will then pull it apart so the lifetime of the target is within the scope of the expression containing this statement expression. */ if (TREE_CODE (expr) == TARGET_EXPR) ; else if (!IS_AGGR_TYPE (type) || TYPE_HAS_TRIVIAL_INIT_REF (type)) expr = build_target_expr_with_type (expr, type); else { /* Copy construct. */ expr = build_special_member_call (NULL_TREE, complete_ctor_identifier, build_tree_list (NULL_TREE, expr), TYPE_BINFO (type), LOOKUP_NORMAL); expr = build_cplus_new (type, expr); my_friendly_assert (TREE_CODE (expr) == TARGET_EXPR, 20030729); } } if (expr != error_mark_node) { result = build_stmt (EXPR_STMT, expr); add_stmt (result); } } finish_stmt (); /* Remember the last expression so that finish_stmt_expr can pull it apart. */ last_expr_type = result ? result : void_type_node; return result; } /* Finish a statement-expression. EXPR should be the value returned by the previous begin_stmt_expr. Returns an expression representing the statement-expression. */ tree finish_stmt_expr (tree rtl_expr, bool has_no_scope) { tree result; tree result_stmt = last_expr_type; tree type; if (!last_expr_type) type = void_type_node; else { if (result_stmt == void_type_node) { type = void_type_node; result_stmt = NULL_TREE; } else type = TREE_TYPE (EXPR_STMT_EXPR (result_stmt)); } result = build_min (STMT_EXPR, type, last_tree); TREE_SIDE_EFFECTS (result) = 1; STMT_EXPR_NO_SCOPE (result) = has_no_scope; last_expr_type = NULL_TREE; /* Remove the compound statement from the tree structure; it is now saved in the STMT_EXPR. */ last_tree = rtl_expr; TREE_CHAIN (last_tree) = NULL_TREE; /* If we created a statement-tree for this statement-expression, remove it now. */ if (! cfun && TREE_CHAIN (scope_chain->x_saved_tree) == NULL_TREE) finish_stmt_tree (&scope_chain->x_saved_tree); if (processing_template_decl) return result; if (!VOID_TYPE_P (type)) { /* Pull out the TARGET_EXPR that is the final expression. Put the target's init_expr as the final expression and then put the statement expression itself as the target's init expr. Finally, return the target expression. */ tree last_expr = EXPR_STMT_EXPR (result_stmt); my_friendly_assert (TREE_CODE (last_expr) == TARGET_EXPR, 20030729); EXPR_STMT_EXPR (result_stmt) = TREE_OPERAND (last_expr, 1); TREE_OPERAND (last_expr, 1) = result; result = last_expr; } return result; } /* Perform Koenig lookup. FN is the postfix-expression representing the function (or functions) to call; ARGS are the arguments to the call. Returns the functions to be considered by overload resolution. */ tree perform_koenig_lookup (tree fn, tree args) { tree identifier = NULL_TREE; tree functions = NULL_TREE; /* Find the name of the overloaded function. */ if (TREE_CODE (fn) == IDENTIFIER_NODE) identifier = fn; else if (is_overloaded_fn (fn)) { functions = fn; identifier = DECL_NAME (get_first_fn (functions)); } else if (DECL_P (fn)) { functions = fn; identifier = DECL_NAME (fn); } /* A call to a namespace-scope function using an unqualified name. Do Koenig lookup -- unless any of the arguments are type-dependent. */ if (!any_type_dependent_arguments_p (args)) { fn = lookup_arg_dependent (identifier, functions, args); if (!fn) /* The unqualified name could not be resolved. */ fn = unqualified_fn_lookup_error (identifier); } else fn = identifier; return fn; } /* Generate an expression for `FN (ARGS)'. If DISALLOW_VIRTUAL is true, the call to FN will be not generated as a virtual call, even if FN is virtual. (This flag is set when encountering an expression where the function name is explicitly qualified. For example a call to `X::f' never generates a virtual call.) Returns code for the call. */ tree finish_call_expr (tree fn, tree args, bool disallow_virtual, bool koenig_p) { tree result; tree orig_fn; tree orig_args; if (fn == error_mark_node || args == error_mark_node) return error_mark_node; /* ARGS should be a list of arguments. */ my_friendly_assert (!args || TREE_CODE (args) == TREE_LIST, 20020712); orig_fn = fn; orig_args = args; if (processing_template_decl) { if (type_dependent_expression_p (fn) || any_type_dependent_arguments_p (args)) { result = build_nt (CALL_EXPR, fn, args); KOENIG_LOOKUP_P (result) = koenig_p; return result; } if (!BASELINK_P (fn) && TREE_CODE (fn) != PSEUDO_DTOR_EXPR && TREE_TYPE (fn) != unknown_type_node) fn = build_non_dependent_expr (fn); args = build_non_dependent_args (orig_args); } /* A reference to a member function will appear as an overloaded function (rather than a BASELINK) if an unqualified name was used to refer to it. */ if (!BASELINK_P (fn) && is_overloaded_fn (fn)) { tree f = fn; if (TREE_CODE (f) == TEMPLATE_ID_EXPR) f = TREE_OPERAND (f, 0); f = get_first_fn (f); if (DECL_FUNCTION_MEMBER_P (f)) { tree type = currently_open_derived_class (DECL_CONTEXT (f)); if (!type) type = DECL_CONTEXT (f); fn = build_baselink (TYPE_BINFO (type), TYPE_BINFO (type), fn, /*optype=*/NULL_TREE); } } result = NULL_TREE; if (BASELINK_P (fn)) { tree object; /* A call to a member function. From [over.call.func]: If the keyword this is in scope and refers to the class of that member function, or a derived class thereof, then the function call is transformed into a qualified function call using (*this) as the postfix-expression to the left of the . operator.... [Otherwise] a contrived object of type T becomes the implied object argument. This paragraph is unclear about this situation: struct A { void f(); }; struct B : public A {}; struct C : public A { void g() { B::f(); }}; In particular, for `B::f', this paragraph does not make clear whether "the class of that member function" refers to `A' or to `B'. We believe it refers to `B'. */ if (current_class_type && DERIVED_FROM_P (BINFO_TYPE (BASELINK_ACCESS_BINFO (fn)), current_class_type) && current_class_ref) object = maybe_dummy_object (BINFO_TYPE (BASELINK_ACCESS_BINFO (fn)), NULL); else { tree representative_fn; representative_fn = BASELINK_FUNCTIONS (fn); if (TREE_CODE (representative_fn) == TEMPLATE_ID_EXPR) representative_fn = TREE_OPERAND (representative_fn, 0); representative_fn = get_first_fn (representative_fn); object = build_dummy_object (DECL_CONTEXT (representative_fn)); } if (processing_template_decl) { if (type_dependent_expression_p (object)) return build_nt (CALL_EXPR, orig_fn, orig_args); object = build_non_dependent_expr (object); } result = build_new_method_call (object, fn, args, NULL_TREE, (disallow_virtual ? LOOKUP_NONVIRTUAL : 0)); } else if (is_overloaded_fn (fn)) /* A call to a namespace-scope function. */ result = build_new_function_call (fn, args); else if (TREE_CODE (fn) == PSEUDO_DTOR_EXPR) { if (args) error ("arguments to destructor are not allowed"); /* Mark the pseudo-destructor call as having side-effects so that we do not issue warnings about its use. */ result = build1 (NOP_EXPR, void_type_node, TREE_OPERAND (fn, 0)); TREE_SIDE_EFFECTS (result) = 1; } else if (CLASS_TYPE_P (TREE_TYPE (fn))) /* If the "function" is really an object of class type, it might have an overloaded `operator ()'. */ result = build_new_op (CALL_EXPR, LOOKUP_NORMAL, fn, args, NULL_TREE, /*overloaded_p=*/NULL); if (!result) /* A call where the function is unknown. */ result = build_function_call (fn, args); if (processing_template_decl) { result = build (CALL_EXPR, TREE_TYPE (result), orig_fn, orig_args); KOENIG_LOOKUP_P (result) = koenig_p; } return result; } /* Finish a call to a postfix increment or decrement or EXPR. (Which is indicated by CODE, which should be POSTINCREMENT_EXPR or POSTDECREMENT_EXPR.) */ tree finish_increment_expr (tree expr, enum tree_code code) { return build_x_unary_op (code, expr); } /* Finish a use of `this'. Returns an expression for `this'. */ tree finish_this_expr (void) { tree result; if (current_class_ptr) { result = current_class_ptr; } else if (current_function_decl && DECL_STATIC_FUNCTION_P (current_function_decl)) { error ("`this' is unavailable for static member functions"); result = error_mark_node; } else { if (current_function_decl) error ("invalid use of `this' in non-member function"); else error ("invalid use of `this' at top level"); result = error_mark_node; } return result; } /* Finish a pseudo-destructor expression. If SCOPE is NULL, the expression was of the form `OBJECT.~DESTRUCTOR' where DESTRUCTOR is the TYPE for the type given. If SCOPE is non-NULL, the expression was of the form `OBJECT.SCOPE::~DESTRUCTOR'. */ tree finish_pseudo_destructor_expr (tree object, tree scope, tree destructor) { if (destructor == error_mark_node) return error_mark_node; my_friendly_assert (TYPE_P (destructor), 20010905); if (!processing_template_decl) { if (scope == error_mark_node) { error ("invalid qualifying scope in pseudo-destructor name"); return error_mark_node; } /* [expr.pseudo] says both: The type designated by the pseudo-destructor-name shall be the same as the object type. and: The cv-unqualified versions of the object type and of the type designated by the pseudo-destructor-name shall be the same type. We implement the more generous second sentence, since that is what most other compilers do. */ if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (object), destructor)) { error ("`%E' is not of type `%T'", object, destructor); return error_mark_node; } } return build (PSEUDO_DTOR_EXPR, void_type_node, object, scope, destructor); } /* Finish an expression of the form CODE EXPR. */ tree finish_unary_op_expr (enum tree_code code, tree expr) { tree result = build_x_unary_op (code, expr); /* Inside a template, build_x_unary_op does not fold the expression. So check whether the result is folded before setting TREE_NEGATED_INT. */ if (code == NEGATE_EXPR && TREE_CODE (expr) == INTEGER_CST && TREE_CODE (result) == INTEGER_CST && !TREE_UNSIGNED (TREE_TYPE (result)) && INT_CST_LT (result, integer_zero_node)) TREE_NEGATED_INT (result) = 1; overflow_warning (result); return result; } /* Finish a compound-literal expression. TYPE is the type to which the INITIALIZER_LIST is being cast. */ tree finish_compound_literal (tree type, tree initializer_list) { tree compound_literal; /* Build a CONSTRUCTOR for the INITIALIZER_LIST. */ compound_literal = build_constructor (NULL_TREE, initializer_list); /* Mark it as a compound-literal. */ TREE_HAS_CONSTRUCTOR (compound_literal) = 1; if (processing_template_decl) TREE_TYPE (compound_literal) = type; else { /* Check the initialization. */ compound_literal = digest_init (type, compound_literal, NULL); /* If the TYPE was an array type with an unknown bound, then we can figure out the dimension now. For example, something like: `(int []) { 2, 3 }' implies that the array has two elements. */ if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type)) complete_array_type (type, compound_literal, 1); } return compound_literal; } /* Return the declaration for the function-name variable indicated by ID. */ tree finish_fname (tree id) { tree decl; decl = fname_decl (C_RID_CODE (id), id); if (processing_template_decl) decl = DECL_NAME (decl); return decl; } /* Begin a function definition declared with DECL_SPECS, ATTRIBUTES, and DECLARATOR. Returns nonzero if the function-declaration is valid. */ int begin_function_definition (tree decl_specs, tree attributes, tree declarator) { if (!start_function (decl_specs, declarator, attributes, SF_DEFAULT)) return 0; /* The things we're about to see are not directly qualified by any template headers we've seen thus far. */ reset_specialization (); return 1; } /* Finish a translation unit. */ void finish_translation_unit (void) { /* In case there were missing closebraces, get us back to the global binding level. */ pop_everything (); while (current_namespace != global_namespace) pop_namespace (); /* Do file scope __FUNCTION__ et al. */ finish_fname_decls (); } /* Finish a template type parameter, specified as AGGR IDENTIFIER. Returns the parameter. */ tree finish_template_type_parm (tree aggr, tree identifier) { if (aggr != class_type_node) { pedwarn ("template type parameters must use the keyword `class' or `typename'"); aggr = class_type_node; } return build_tree_list (aggr, identifier); } /* Finish a template template parameter, specified as AGGR IDENTIFIER. Returns the parameter. */ tree finish_template_template_parm (tree aggr, tree identifier) { tree decl = build_decl (TYPE_DECL, identifier, NULL_TREE); tree tmpl = build_lang_decl (TEMPLATE_DECL, identifier, NULL_TREE); DECL_TEMPLATE_PARMS (tmpl) = current_template_parms; DECL_TEMPLATE_RESULT (tmpl) = decl; DECL_ARTIFICIAL (decl) = 1; end_template_decl (); my_friendly_assert (DECL_TEMPLATE_PARMS (tmpl), 20010110); return finish_template_type_parm (aggr, tmpl); } /* ARGUMENT is the default-argument value for a template template parameter. If ARGUMENT is invalid, issue error messages and return the ERROR_MARK_NODE. Otherwise, ARGUMENT itself is returned. */ tree check_template_template_default_arg (tree argument) { if (TREE_CODE (argument) != TEMPLATE_DECL && TREE_CODE (argument) != TEMPLATE_TEMPLATE_PARM && TREE_CODE (argument) != UNBOUND_CLASS_TEMPLATE) { if (TREE_CODE (argument) == TYPE_DECL) { tree t = TREE_TYPE (argument); /* Try to emit a slightly smarter error message if we detect that the user is using a template instantiation. */ if (CLASSTYPE_TEMPLATE_INFO (t) && CLASSTYPE_TEMPLATE_INSTANTIATION (t)) error ("invalid use of type `%T' as a default value for a " "template template-parameter", t); else error ("invalid use of `%D' as a default value for a template " "template-parameter", argument); } else error ("invalid default argument for a template template parameter"); return error_mark_node; } return argument; } /* Finish a parameter list, indicated by PARMS. If ELLIPSIS is nonzero, the parameter list was terminated by a `...'. */ tree finish_parmlist (tree parms, int ellipsis) { if (parms) { /* We mark the PARMS as a parmlist so that declarator processing can disambiguate certain constructs. */ TREE_PARMLIST (parms) = 1; /* We do not append void_list_node here, but leave it to grokparms to do that. */ PARMLIST_ELLIPSIS_P (parms) = ellipsis; } return parms; } /* Begin a class definition, as indicated by T. */ tree begin_class_definition (tree t) { if (t == error_mark_node) return error_mark_node; if (processing_template_parmlist) { error ("definition of `%#T' inside template parameter list", t); return error_mark_node; } /* A non-implicit typename comes from code like: template struct A { template struct A::B ... This is erroneous. */ else if (TREE_CODE (t) == TYPENAME_TYPE) { error ("invalid definition of qualified type `%T'", t); t = error_mark_node; } if (t == error_mark_node || ! IS_AGGR_TYPE (t)) { t = make_aggr_type (RECORD_TYPE); pushtag (make_anon_name (), t, 0); } /* If this type was already complete, and we see another definition, that's an error. */ if (COMPLETE_TYPE_P (t)) { error ("redefinition of `%#T'", t); cp_error_at ("previous definition of `%#T'", t); return error_mark_node; } /* Update the location of the decl. */ DECL_SOURCE_LOCATION (TYPE_NAME (t)) = input_location; if (TYPE_BEING_DEFINED (t)) { t = make_aggr_type (TREE_CODE (t)); pushtag (TYPE_IDENTIFIER (t), t, 0); } maybe_process_partial_specialization (t); pushclass (t); TYPE_BEING_DEFINED (t) = 1; if (flag_pack_struct) { tree v; TYPE_PACKED (t) = 1; /* Even though the type is being defined for the first time here, there might have been a forward declaration, so there might be cv-qualified variants of T. */ for (v = TYPE_NEXT_VARIANT (t); v; v = TYPE_NEXT_VARIANT (v)) TYPE_PACKED (v) = 1; } /* Reset the interface data, at the earliest possible moment, as it might have been set via a class foo; before. */ if (! TYPE_ANONYMOUS_P (t)) { CLASSTYPE_INTERFACE_ONLY (t) = interface_only; SET_CLASSTYPE_INTERFACE_UNKNOWN_X (t, interface_unknown); } reset_specialization(); /* Make a declaration for this class in its own scope. */ build_self_reference (); return t; } /* Finish the member declaration given by DECL. */ void finish_member_declaration (tree decl) { if (decl == error_mark_node || decl == NULL_TREE) return; if (decl == void_type_node) /* The COMPONENT was a friend, not a member, and so there's nothing for us to do. */ return; /* We should see only one DECL at a time. */ my_friendly_assert (TREE_CHAIN (decl) == NULL_TREE, 0); /* Set up access control for DECL. */ TREE_PRIVATE (decl) = (current_access_specifier == access_private_node); TREE_PROTECTED (decl) = (current_access_specifier == access_protected_node); if (TREE_CODE (decl) == TEMPLATE_DECL) { TREE_PRIVATE (DECL_TEMPLATE_RESULT (decl)) = TREE_PRIVATE (decl); TREE_PROTECTED (DECL_TEMPLATE_RESULT (decl)) = TREE_PROTECTED (decl); } /* Mark the DECL as a member of the current class. */ DECL_CONTEXT (decl) = current_class_type; /* [dcl.link] A C language linkage is ignored for the names of class members and the member function type of class member functions. */ if (DECL_LANG_SPECIFIC (decl) && DECL_LANGUAGE (decl) == lang_c) SET_DECL_LANGUAGE (decl, lang_cplusplus); /* Put functions on the TYPE_METHODS list and everything else on the TYPE_FIELDS list. Note that these are built up in reverse order. We reverse them (to obtain declaration order) in finish_struct. */ if (TREE_CODE (decl) == FUNCTION_DECL || DECL_FUNCTION_TEMPLATE_P (decl)) { /* We also need to add this function to the CLASSTYPE_METHOD_VEC. */ add_method (current_class_type, decl, /*error_p=*/0); TREE_CHAIN (decl) = TYPE_METHODS (current_class_type); TYPE_METHODS (current_class_type) = decl; maybe_add_class_template_decl_list (current_class_type, decl, /*friend_p=*/0); } /* Enter the DECL into the scope of the class. */ else if ((TREE_CODE (decl) == USING_DECL && TREE_TYPE (decl)) || pushdecl_class_level (decl)) { /* All TYPE_DECLs go at the end of TYPE_FIELDS. Ordinary fields go at the beginning. The reason is that lookup_field_1 searches the list in order, and we want a field name to override a type name so that the "struct stat hack" will work. In particular: struct S { enum E { }; int E } s; s.E = 3; is valid. In addition, the FIELD_DECLs must be maintained in declaration order so that class layout works as expected. However, we don't need that order until class layout, so we save a little time by putting FIELD_DECLs on in reverse order here, and then reversing them in finish_struct_1. (We could also keep a pointer to the correct insertion points in the list.) */ if (TREE_CODE (decl) == TYPE_DECL) TYPE_FIELDS (current_class_type) = chainon (TYPE_FIELDS (current_class_type), decl); else { TREE_CHAIN (decl) = TYPE_FIELDS (current_class_type); TYPE_FIELDS (current_class_type) = decl; } maybe_add_class_template_decl_list (current_class_type, decl, /*friend_p=*/0); } } /* Finish processing the declaration of a member class template TYPES whose template parameters are given by PARMS. */ tree finish_member_class_template (tree types) { tree t; /* If there are declared, but undefined, partial specializations mixed in with the typespecs they will not yet have passed through maybe_process_partial_specialization, so we do that here. */ for (t = types; t != NULL_TREE; t = TREE_CHAIN (t)) if (IS_AGGR_TYPE_CODE (TREE_CODE (TREE_VALUE (t)))) maybe_process_partial_specialization (TREE_VALUE (t)); grok_x_components (types); if (TYPE_CONTEXT (TREE_VALUE (types)) != current_class_type) /* The component was in fact a friend declaration. We avoid finish_member_template_decl performing certain checks by unsetting TYPES. */ types = NULL_TREE; finish_member_template_decl (types); /* As with other component type declarations, we do not store the new DECL on the list of component_decls. */ return NULL_TREE; } /* Finish processing a complete template declaration. The PARMS are the template parameters. */ void finish_template_decl (tree parms) { if (parms) end_template_decl (); else end_specialization (); } /* Finish processing a template-id (which names a type) of the form NAME < ARGS >. Return the TYPE_DECL for the type named by the template-id. If ENTERING_SCOPE is nonzero we are about to enter the scope of template-id indicated. */ tree finish_template_type (tree name, tree args, int entering_scope) { tree decl; decl = lookup_template_class (name, args, NULL_TREE, NULL_TREE, entering_scope, tf_error | tf_warning | tf_user); if (decl != error_mark_node) decl = TYPE_STUB_DECL (decl); return decl; } /* Finish processing a BASE_CLASS with the indicated ACCESS_SPECIFIER. Return a TREE_LIST containing the ACCESS_SPECIFIER and the BASE_CLASS, or NULL_TREE if an error occurred. The ACCESS_SPECIFIER is one of access_{default,public,protected_private}[_virtual]_node.*/ tree finish_base_specifier (tree base, tree access, bool virtual_p) { tree result; if (base == error_mark_node) { error ("invalid base-class specification"); result = NULL_TREE; } else if (! is_aggr_type (base, 1)) result = NULL_TREE; else { if (cp_type_quals (base) != 0) { error ("base class `%T' has cv qualifiers", base); base = TYPE_MAIN_VARIANT (base); } result = build_tree_list (access, base); TREE_VIA_VIRTUAL (result) = virtual_p; } return result; } /* Called when multiple declarators are processed. If that is not permitted in this context, an error is issued. */ void check_multiple_declarators (void) { /* [temp] In a template-declaration, explicit specialization, or explicit instantiation the init-declarator-list in the declaration shall contain at most one declarator. We don't just use PROCESSING_TEMPLATE_DECL for the first condition since that would disallow the perfectly valid code, like `template struct S { int i, j; };'. */ if (at_function_scope_p ()) /* It's OK to write `template void f() { int i, j;}'. */ return; if (PROCESSING_REAL_TEMPLATE_DECL_P () || processing_explicit_instantiation || processing_specialization) error ("multiple declarators in template declaration"); } /* Issue a diagnostic that NAME cannot be found in SCOPE. */ void qualified_name_lookup_error (tree scope, tree name) { if (scope == error_mark_node) ; /* We already complained. */ else if (TYPE_P (scope)) { if (!COMPLETE_TYPE_P (scope)) error ("incomplete type `%T' used in nested name specifier", scope); else error ("`%D' is not a member of `%T'", name, scope); } else if (scope != global_namespace) error ("`%D' is not a member of `%D'", name, scope); else error ("`::%D' has not been declared", name); } /* ID_EXPRESSION is a representation of parsed, but unprocessed, id-expression. (See cp_parser_id_expression for details.) SCOPE, if non-NULL, is the type or namespace used to explicitly qualify ID_EXPRESSION. DECL is the entity to which that name has been resolved. *CONSTANT_EXPRESSION_P is true if we are presently parsing a constant-expression. In that case, *NON_CONSTANT_EXPRESSION_P will be set to true if this expression isn't permitted in a constant-expression, but it is otherwise not set by this function. *ALLOW_NON_CONSTANT_EXPRESSION_P is true if we are parsing a constant-expression, but a non-constant expression is also permissible. If an error occurs, and it is the kind of error that might cause the parser to abort a tentative parse, *ERROR_MSG is filled in. It is the caller's responsibility to issue the message. *ERROR_MSG will be a string with static storage duration, so the caller need not "free" it. Return an expression for the entity, after issuing appropriate diagnostics. This function is also responsible for transforming a reference to a non-static member into a COMPONENT_REF that makes the use of "this" explicit. Upon return, *IDK will be filled in appropriately. */ tree finish_id_expression (tree id_expression, tree decl, tree scope, cp_id_kind *idk, tree *qualifying_class, bool integral_constant_expression_p, bool allow_non_integral_constant_expression_p, bool *non_integral_constant_expression_p, const char **error_msg) { /* Initialize the output parameters. */ *idk = CP_ID_KIND_NONE; *error_msg = NULL; if (id_expression == error_mark_node) return error_mark_node; /* If we have a template-id, then no further lookup is required. If the template-id was for a template-class, we will sometimes have a TYPE_DECL at this point. */ else if (TREE_CODE (decl) == TEMPLATE_ID_EXPR || TREE_CODE (decl) == TYPE_DECL) ; /* Look up the name. */ else { if (decl == error_mark_node) { /* Name lookup failed. */ if (scope && (!TYPE_P (scope) || (!dependent_type_p (scope) && !(TREE_CODE (id_expression) == IDENTIFIER_NODE && IDENTIFIER_TYPENAME_P (id_expression) && dependent_type_p (TREE_TYPE (id_expression)))))) { /* If the qualifying type is non-dependent (and the name does not name a conversion operator to a dependent type), issue an error. */ qualified_name_lookup_error (scope, id_expression); return error_mark_node; } else if (!scope) { /* It may be resolved via Koenig lookup. */ *idk = CP_ID_KIND_UNQUALIFIED; return id_expression; } else decl = id_expression; } /* If DECL is a variable that would be out of scope under ANSI/ISO rules, but in scope in the ARM, name lookup will succeed. Issue a diagnostic here. */ else decl = check_for_out_of_scope_variable (decl); /* Remember that the name was used in the definition of the current class so that we can check later to see if the meaning would have been different after the class was entirely defined. */ if (!scope && decl != error_mark_node) maybe_note_name_used_in_class (id_expression, decl); /* Disallow uses of local variables from containing functions. */ if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL) { tree context = decl_function_context (decl); if (context != NULL_TREE && context != current_function_decl && ! TREE_STATIC (decl)) { error (TREE_CODE (decl) == VAR_DECL ? "use of `auto' variable from containing function" : "use of parameter from containing function"); cp_error_at (" `%#D' declared here", decl); return error_mark_node; } } } /* If we didn't find anything, or what we found was a type, then this wasn't really an id-expression. */ if (TREE_CODE (decl) == TEMPLATE_DECL && !DECL_FUNCTION_TEMPLATE_P (decl)) { *error_msg = "missing template arguments"; return error_mark_node; } else if (TREE_CODE (decl) == TYPE_DECL || TREE_CODE (decl) == NAMESPACE_DECL) { *error_msg = "expected primary-expression"; return error_mark_node; } /* If the name resolved to a template parameter, there is no need to look it up again later. */ if ((TREE_CODE (decl) == CONST_DECL && DECL_TEMPLATE_PARM_P (decl)) || TREE_CODE (decl) == TEMPLATE_PARM_INDEX) { *idk = CP_ID_KIND_NONE; if (TREE_CODE (decl) == TEMPLATE_PARM_INDEX) decl = TEMPLATE_PARM_DECL (decl); if (integral_constant_expression_p && !dependent_type_p (TREE_TYPE (decl)) && !INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (decl))) { if (!allow_non_integral_constant_expression_p) error ("template parameter `%D' of type `%T' is not allowed in " "an integral constant expression because it is not of " "integral or enumeration type", decl, TREE_TYPE (decl)); *non_integral_constant_expression_p = true; } return DECL_INITIAL (decl); } /* Similarly, we resolve enumeration constants to their underlying values. */ else if (TREE_CODE (decl) == CONST_DECL) { *idk = CP_ID_KIND_NONE; if (!processing_template_decl) return DECL_INITIAL (decl); return decl; } else { bool dependent_p; /* If the declaration was explicitly qualified indicate that. The semantics of `A::f(3)' are different than `f(3)' if `f' is virtual. */ *idk = (scope ? CP_ID_KIND_QUALIFIED : (TREE_CODE (decl) == TEMPLATE_ID_EXPR ? CP_ID_KIND_TEMPLATE_ID : CP_ID_KIND_UNQUALIFIED)); /* [temp.dep.expr] An id-expression is type-dependent if it contains an identifier that was declared with a dependent type. The standard is not very specific about an id-expression that names a set of overloaded functions. What if some of them have dependent types and some of them do not? Presumably, such a name should be treated as a dependent name. */ /* Assume the name is not dependent. */ dependent_p = false; if (!processing_template_decl) /* No names are dependent outside a template. */ ; /* A template-id where the name of the template was not resolved is definitely dependent. */ else if (TREE_CODE (decl) == TEMPLATE_ID_EXPR && (TREE_CODE (TREE_OPERAND (decl, 0)) == IDENTIFIER_NODE)) dependent_p = true; /* For anything except an overloaded function, just check its type. */ else if (!is_overloaded_fn (decl)) dependent_p = dependent_type_p (TREE_TYPE (decl)); /* For a set of overloaded functions, check each of the functions. */ else { tree fns = decl; if (BASELINK_P (fns)) fns = BASELINK_FUNCTIONS (fns); /* For a template-id, check to see if the template arguments are dependent. */ if (TREE_CODE (fns) == TEMPLATE_ID_EXPR) { tree args = TREE_OPERAND (fns, 1); dependent_p = any_dependent_template_arguments_p (args); /* The functions are those referred to by the template-id. */ fns = TREE_OPERAND (fns, 0); } /* If there are no dependent template arguments, go through the overloaded functions. */ while (fns && !dependent_p) { tree fn = OVL_CURRENT (fns); /* Member functions of dependent classes are dependent. */ if (TREE_CODE (fn) == FUNCTION_DECL && type_dependent_expression_p (fn)) dependent_p = true; else if (TREE_CODE (fn) == TEMPLATE_DECL && dependent_template_p (fn)) dependent_p = true; fns = OVL_NEXT (fns); } } /* If the name was dependent on a template parameter, we will resolve the name at instantiation time. */ if (dependent_p) { /* Create a SCOPE_REF for qualified names, if the scope is dependent. */ if (scope) { if (TYPE_P (scope)) *qualifying_class = scope; /* Since this name was dependent, the expression isn't constant -- yet. No error is issued because it might be constant when things are instantiated. */ if (integral_constant_expression_p) *non_integral_constant_expression_p = true; if (TYPE_P (scope) && dependent_type_p (scope)) return build_nt (SCOPE_REF, scope, id_expression); else if (TYPE_P (scope) && DECL_P (decl)) return build (SCOPE_REF, TREE_TYPE (decl), scope, id_expression); else return decl; } /* A TEMPLATE_ID already contains all the information we need. */ if (TREE_CODE (id_expression) == TEMPLATE_ID_EXPR) return id_expression; /* Since this name was dependent, the expression isn't constant -- yet. No error is issued because it might be constant when things are instantiated. */ if (integral_constant_expression_p) *non_integral_constant_expression_p = true; *idk = CP_ID_KIND_UNQUALIFIED_DEPENDENT; /* If we found a variable, then name lookup during the instantiation will always resolve to the same VAR_DECL (or an instantiation thereof). */ if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL) return decl; /* The same is true for FIELD_DECL, but we also need to make sure that the syntax is correct. */ else if (TREE_CODE (decl) == FIELD_DECL) { /* Since SCOPE is NULL here, this is an unqualified name. Access checking has been performed during name lookup already. Turn off checking to avoid duplicate errors. */ push_deferring_access_checks (dk_no_check); decl = finish_non_static_data_member (decl, current_class_ref, /*qualifying_scope=*/NULL_TREE); pop_deferring_access_checks (); return decl; } return id_expression; } /* Only certain kinds of names are allowed in constant expression. Enumerators and template parameters have already been handled above. */ if (integral_constant_expression_p && !DECL_INTEGRAL_CONSTANT_VAR_P (decl)) { if (!allow_non_integral_constant_expression_p) { error ("`%D' cannot appear in a constant-expression", decl); return error_mark_node; } *non_integral_constant_expression_p = true; } if (TREE_CODE (decl) == NAMESPACE_DECL) { error ("use of namespace `%D' as expression", decl); return error_mark_node; } else if (DECL_CLASS_TEMPLATE_P (decl)) { error ("use of class template `%T' as expression", decl); return error_mark_node; } else if (TREE_CODE (decl) == TREE_LIST) { /* Ambiguous reference to base members. */ error ("request for member `%D' is ambiguous in " "multiple inheritance lattice", id_expression); print_candidates (decl); return error_mark_node; } /* Mark variable-like entities as used. Functions are similarly marked either below or after overload resolution. */ if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL || TREE_CODE (decl) == RESULT_DECL) mark_used (decl); if (scope) { decl = (adjust_result_of_qualified_name_lookup (decl, scope, current_class_type)); if (TREE_CODE (decl) == FUNCTION_DECL) mark_used (decl); if (TREE_CODE (decl) == FIELD_DECL || BASELINK_P (decl)) *qualifying_class = scope; else if (!processing_template_decl) decl = convert_from_reference (decl); else if (TYPE_P (scope)) decl = build (SCOPE_REF, TREE_TYPE (decl), scope, decl); } else if (TREE_CODE (decl) == FIELD_DECL) { /* Since SCOPE is NULL here, this is an unqualified name. Access checking has been performed during name lookup already. Turn off checking to avoid duplicate errors. */ push_deferring_access_checks (dk_no_check); decl = finish_non_static_data_member (decl, current_class_ref, /*qualifying_scope=*/NULL_TREE); pop_deferring_access_checks (); } else if (is_overloaded_fn (decl)) { tree first_fn = OVL_CURRENT (decl); if (TREE_CODE (first_fn) == TEMPLATE_DECL) first_fn = DECL_TEMPLATE_RESULT (first_fn); if (!really_overloaded_fn (decl)) mark_used (first_fn); if (TREE_CODE (first_fn) == FUNCTION_DECL && DECL_FUNCTION_MEMBER_P (first_fn) && !shared_member_p (decl)) { /* A set of member functions. */ decl = maybe_dummy_object (DECL_CONTEXT (first_fn), 0); return finish_class_member_access_expr (decl, id_expression); } } else { if (DECL_P (decl) && DECL_NONLOCAL (decl) && DECL_CLASS_SCOPE_P (decl) && DECL_CONTEXT (decl) != current_class_type) { tree path; path = currently_open_derived_class (DECL_CONTEXT (decl)); perform_or_defer_access_check (TYPE_BINFO (path), decl); } if (! processing_template_decl) decl = convert_from_reference (decl); } /* Resolve references to variables of anonymous unions into COMPONENT_REFs. */ if (TREE_CODE (decl) == ALIAS_DECL) decl = DECL_INITIAL (decl); } if (TREE_DEPRECATED (decl)) warn_deprecated_use (decl); return decl; } /* Implement the __typeof keyword: Return the type of EXPR, suitable for use as a type-specifier. */ tree finish_typeof (tree expr) { tree type; if (type_dependent_expression_p (expr)) { type = make_aggr_type (TYPEOF_TYPE); TYPE_FIELDS (type) = expr; return type; } type = TREE_TYPE (expr); if (!type || type == unknown_type_node) { error ("type of `%E' is unknown", expr); return error_mark_node; } return type; } /* Generate RTL for the statement T, and its substatements, and any other statements at its nesting level. */ static void cp_expand_stmt (tree t) { switch (TREE_CODE (t)) { case TRY_BLOCK: genrtl_try_block (t); break; case EH_SPEC_BLOCK: genrtl_eh_spec_block (t); break; case HANDLER: genrtl_handler (t); break; case USING_STMT: break; default: abort (); break; } } /* Called from expand_body via walk_tree. Replace all AGGR_INIT_EXPRs will equivalent CALL_EXPRs. */ static tree simplify_aggr_init_exprs_r (tree* tp, int* walk_subtrees, void* data ATTRIBUTE_UNUSED) { /* We don't need to walk into types; there's nothing in a type that needs simplification. (And, furthermore, there are places we actively don't want to go. For example, we don't want to wander into the default arguments for a FUNCTION_DECL that appears in a CALL_EXPR.) */ if (TYPE_P (*tp)) { *walk_subtrees = 0; return NULL_TREE; } /* Only AGGR_INIT_EXPRs are interesting. */ else if (TREE_CODE (*tp) != AGGR_INIT_EXPR) return NULL_TREE; simplify_aggr_init_expr (tp); /* Keep iterating. */ return NULL_TREE; } /* Replace the AGGR_INIT_EXPR at *TP with an equivalent CALL_EXPR. This function is broken out from the above for the benefit of the tree-ssa project. */ void simplify_aggr_init_expr (tree *tp) { tree aggr_init_expr = *tp; /* Form an appropriate CALL_EXPR. */ tree fn = TREE_OPERAND (aggr_init_expr, 0); tree args = TREE_OPERAND (aggr_init_expr, 1); tree slot = TREE_OPERAND (aggr_init_expr, 2); tree type = TREE_TYPE (aggr_init_expr); tree call_expr; enum style_t { ctor, arg, pcc } style; if (AGGR_INIT_VIA_CTOR_P (aggr_init_expr)) style = ctor; #ifdef PCC_STATIC_STRUCT_RETURN else if (1) style = pcc; #endif else if (TREE_ADDRESSABLE (type)) style = arg; else /* We shouldn't build an AGGR_INIT_EXPR if we don't need any special handling. See build_cplus_new. */ abort (); if (style == ctor || style == arg) { /* Pass the address of the slot. If this is a constructor, we replace the first argument; otherwise, we tack on a new one. */ tree addr; if (style == ctor) args = TREE_CHAIN (args); cxx_mark_addressable (slot); addr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (slot)), slot); if (style == arg) { /* The return type might have different cv-quals from the slot. */ tree fntype = TREE_TYPE (TREE_TYPE (fn)); #ifdef ENABLE_CHECKING if (TREE_CODE (fntype) != FUNCTION_TYPE && TREE_CODE (fntype) != METHOD_TYPE) abort (); #endif addr = convert (build_pointer_type (TREE_TYPE (fntype)), addr); } args = tree_cons (NULL_TREE, addr, args); } call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (TREE_TYPE (fn))), fn, args, NULL_TREE); if (style == arg) /* Tell the backend that we've added our return slot to the argument list. */ CALL_EXPR_HAS_RETURN_SLOT_ADDR (call_expr) = 1; else if (style == pcc) { /* If we're using the non-reentrant PCC calling convention, then we need to copy the returned value out of the static buffer into the SLOT. */ push_deferring_access_checks (dk_no_check); call_expr = build_aggr_init (slot, call_expr, DIRECT_BIND | LOOKUP_ONLYCONVERTING); pop_deferring_access_checks (); } /* We want to use the value of the initialized location as the result. */ call_expr = build (COMPOUND_EXPR, type, call_expr, slot); /* Replace the AGGR_INIT_EXPR with the CALL_EXPR. */ TREE_CHAIN (call_expr) = TREE_CHAIN (aggr_init_expr); *tp = call_expr; } /* Emit all thunks to FN that should be emitted when FN is emitted. */ static void emit_associated_thunks (tree fn) { /* When we use vcall offsets, we emit thunks with the virtual functions to which they thunk. The whole point of vcall offsets is so that you can know statically the entire set of thunks that will ever be needed for a given virtual function, thereby enabling you to output all the thunks with the function itself. */ if (DECL_VIRTUAL_P (fn)) { tree thunk; for (thunk = DECL_THUNKS (fn); thunk; thunk = TREE_CHAIN (thunk)) { if (!THUNK_ALIAS (thunk)) { use_thunk (thunk, /*emit_p=*/1); if (DECL_RESULT_THUNK_P (thunk)) { tree probe; for (probe = DECL_THUNKS (thunk); probe; probe = TREE_CHAIN (probe)) use_thunk (probe, /*emit_p=*/1); } } else my_friendly_assert (!DECL_THUNKS (thunk), 20031023); } } } /* Generate RTL for FN. */ void expand_body (tree fn) { tree saved_function; /* Compute the appropriate object-file linkage for inline functions. */ if (DECL_DECLARED_INLINE_P (fn)) import_export_decl (fn); /* If FN is external, then there's no point in generating RTL for it. This situation can arise with an inline function under `-fexternal-templates'; we instantiate the function, even though we're not planning on emitting it, in case we get a chance to inline it. */ if (DECL_EXTERNAL (fn)) return; /* ??? When is this needed? */ saved_function = current_function_decl; /* Emit any thunks that should be emitted at the same time as FN. */ emit_associated_thunks (fn); timevar_push (TV_INTEGRATION); optimize_function (fn); timevar_pop (TV_INTEGRATION); tree_rest_of_compilation (fn, function_depth > 1); current_function_decl = saved_function; extract_interface_info (); if (DECL_CLONED_FUNCTION_P (fn)) { /* If this is a clone, go through the other clones now and mark their parameters used. We have to do that here, as we don't know whether any particular clone will be expanded, and therefore cannot pick one arbitrarily. */ tree probe; for (probe = TREE_CHAIN (DECL_CLONED_FUNCTION (fn)); probe && DECL_CLONED_FUNCTION_P (probe); probe = TREE_CHAIN (probe)) { tree parms; for (parms = DECL_ARGUMENTS (probe); parms; parms = TREE_CHAIN (parms)) TREE_USED (parms) = 1; } } } /* Generate RTL for FN. */ void expand_or_defer_fn (tree fn) { /* When the parser calls us after finishing the body of a template function, we don't really want to expand the body. */ if (processing_template_decl) { /* Normally, collection only occurs in rest_of_compilation. So, if we don't collect here, we never collect junk generated during the processing of templates until we hit a non-template function. */ ggc_collect (); return; } /* Replace AGGR_INIT_EXPRs with appropriate CALL_EXPRs. */ walk_tree_without_duplicates (&DECL_SAVED_TREE (fn), simplify_aggr_init_exprs_r, NULL); /* If this is a constructor or destructor body, we have to clone it. */ if (maybe_clone_body (fn)) { /* We don't want to process FN again, so pretend we've written it out, even though we haven't. */ TREE_ASM_WRITTEN (fn) = 1; return; } /* There's no reason to do any of the work here if we're only doing semantic analysis; this code just generates RTL. */ if (flag_syntax_only) return; /* Compute the appropriate object-file linkage for inline functions. */ if (DECL_DECLARED_INLINE_P (fn)) import_export_decl (fn); /* If this function is marked with the constructor attribute, add it to the list of functions to be called along with constructors from static duration objects. */ if (DECL_STATIC_CONSTRUCTOR (fn)) static_ctors = tree_cons (NULL_TREE, fn, static_ctors); /* If this function is marked with the destructor attribute, add it to the list of functions to be called along with destructors from static duration objects. */ if (DECL_STATIC_DESTRUCTOR (fn)) static_dtors = tree_cons (NULL_TREE, fn, static_dtors); function_depth++; /* Expand or defer, at the whim of the compilation unit manager. */ cgraph_finalize_function (fn, function_depth > 1); function_depth--; } /* Helper function for walk_tree, used by finish_function to override all the RETURN_STMTs and pertinent CLEANUP_STMTs for the named return value optimization. */ tree nullify_returns_r (tree* tp, int* walk_subtrees, void* data) { tree nrv = (tree) data; /* No need to walk into types. There wouldn't be any need to walk into non-statements, except that we have to consider STMT_EXPRs. */ if (TYPE_P (*tp)) *walk_subtrees = 0; else if (TREE_CODE (*tp) == RETURN_STMT) RETURN_STMT_EXPR (*tp) = NULL_TREE; else if (TREE_CODE (*tp) == CLEANUP_STMT && CLEANUP_DECL (*tp) == nrv) CLEANUP_EH_ONLY (*tp) = 1; /* Replace the DECL_STMT for the NRV with an initialization of the RESULT_DECL, if needed. */ else if (TREE_CODE (*tp) == DECL_STMT && DECL_STMT_DECL (*tp) == nrv) { tree init; if (DECL_INITIAL (nrv) && DECL_INITIAL (nrv) != error_mark_node) { init = build (INIT_EXPR, void_type_node, DECL_RESULT (current_function_decl), DECL_INITIAL (nrv)); DECL_INITIAL (nrv) = error_mark_node; } else init = NULL_TREE; init = build_stmt (EXPR_STMT, init); TREE_CHAIN (init) = TREE_CHAIN (*tp); STMT_LINENO (init) = STMT_LINENO (*tp); *tp = init; } /* Keep iterating. */ return NULL_TREE; } /* Start generating the RTL for FN. */ void cxx_expand_function_start (void) { /* Give our named return value the same RTL as our RESULT_DECL. */ if (current_function_return_value) COPY_DECL_RTL (DECL_RESULT (cfun->decl), current_function_return_value); } /* Perform initialization related to this module. */ void init_cp_semantics (void) { lang_expand_stmt = cp_expand_stmt; } #include "gt-cp-semantics.h"