X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fada%2Fsem_ch12.ads;h=3fe88c96ae728f822776a7792e24f8a8f752f851;hb=4c97a37dc04bd1838ea3d099bebf2900e10322dd;hp=de7d164df5c5cae32201a2f7002556a5adaa0c6a;hpb=9dfe12ae5b94d03c997ea2903022a5d2d5c5f266;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/ada/sem_ch12.ads b/gcc/ada/sem_ch12.ads index de7d164df5c..3fe88c96ae7 100644 --- a/gcc/ada/sem_ch12.ads +++ b/gcc/ada/sem_ch12.ads @@ -6,18 +6,17 @@ -- -- -- S p e c -- -- -- --- Copyright (C) 1992-2003 Free Software Foundation, Inc. -- +-- Copyright (C) 1992-2011, Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- --- ware Foundation; either version 2, or (at your option) any later ver- -- +-- ware Foundation; either version 3, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT 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 distributed with GNAT; see file COPYING. If not, write -- --- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- --- MA 02111-1307, USA. -- +-- Public License distributed with GNAT; see file COPYING3. If not, go to -- +-- http://www.gnu.org/licenses for a complete copy of the license. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- @@ -35,11 +34,11 @@ package Sem_Ch12 is procedure Analyze_Function_Instantiation (N : Node_Id); procedure Analyze_Formal_Object_Declaration (N : Node_Id); procedure Analyze_Formal_Type_Declaration (N : Node_Id); - procedure Analyze_Formal_Subprogram (N : Node_Id); - procedure Analyze_Formal_Package (N : Node_Id); + procedure Analyze_Formal_Subprogram_Declaration (N : Node_Id); + procedure Analyze_Formal_Package_Declaration (N : Node_Id); procedure Start_Generic; - -- Must be invoked before starting to process a generic spec or body. + -- Must be invoked before starting to process a generic spec or body procedure End_Generic; -- Must be invoked just at the end of the end of the processing of a @@ -48,39 +47,78 @@ package Sem_Ch12 is procedure Check_Generic_Child_Unit (Gen_Id : Node_Id; Parent_Installed : in out Boolean); - -- If the name of the generic unit in an instantiation or a renaming - -- is a selected component, then the prefix may be an instance and the - -- selector may designate a child unit. Retrieve the parent generic - -- and search for the child unit that must be declared within. Similarly, - -- if this is the name of a generic child unit within an instantiation of - -- its own parent, retrieve the parent generic. + -- If the name of the generic unit in an instantiation or a renaming is a + -- selected component, then the prefix may be an instance and the selector + -- may designate a child unit. Retrieve the parent generic and search for + -- the child unit that must be declared within. Similarly, if this is the + -- name of a generic child unit within an instantiation of its own parent, + -- retrieve the parent generic. If the parent is installed as a result of + -- this call, then Parent_Installed is set True, otherwise Parent_Installed + -- is unchanged by the call. function Copy_Generic_Node (N : Node_Id; Parent_Id : Node_Id; - Instantiating : Boolean) - return Node_Id; + Instantiating : Boolean) return Node_Id; -- Copy the tree for a generic unit or its body. The unit is copied -- repeatedly: once to produce a copy on which semantic analysis of -- the generic is performed, and once for each instantiation. The tree -- being copied is not semantically analyzed, except that references to - -- global entities are marked on terminal nodes. + -- global entities are marked on terminal nodes. Note that this function + -- copies any aspect specifications from the input node N to the returned + -- node, as well as the setting of the Has_Aspects flag. function Get_Instance_Of (A : Entity_Id) return Entity_Id; -- Retrieve actual associated with given generic parameter. -- If A is uninstantiated or not a generic parameter, return A. + function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id; + -- Given the entity of a unit that is an instantiation, retrieve the + -- original instance node. This is used when loading the instantiations + -- of the ancestors of a child generic that is being instantiated. + procedure Instantiate_Package_Body - (Body_Info : Pending_Body_Info; - Inlined_Body : Boolean := False); + (Body_Info : Pending_Body_Info; + Inlined_Body : Boolean := False; + Body_Optional : Boolean := False); -- Called after semantic analysis, to complete the instantiation of -- package instances. The flag Inlined_Body is set if the body is -- being instantiated on the fly for inlined purposes. + -- + -- The flag Body_Optional indicates that the call is for an instance + -- that precedes the current instance in the same declarative part. + -- This call is needed when instantiating a nested generic whose body + -- is to be found in the body of an instance. Normally we instantiate + -- package bodies only when they appear in the main unit, or when their + -- contents are needed for a nested generic G. If unit U contains several + -- instances I1, I2, etc. and I2 contains a nested generic, then when U + -- appears in the context of some other unit P that contains an instance + -- of G, we compile the body of I2, but not that of I1. However, when we + -- compile U as the main unit, we compile both bodies. This will lead to + -- lead to link-time errors if the compilation of I1 generates public + -- symbols, because those in I2 will receive different names in both + -- cases. This forces us to analyze the body of I1 even when U is not the + -- main unit. We don't want this additional mechanism to generate an error + -- when the body of the generic for I1 is not present, and this is the + -- reason for the presence of the flag Body_Optional, which is exchanged + -- between the current procedure and Load_Parent_Of_Generic. procedure Instantiate_Subprogram_Body - (Body_Info : Pending_Body_Info); + (Body_Info : Pending_Body_Info; + Body_Optional : Boolean := False); -- Called after semantic analysis, to complete the instantiation of - -- function and procedure instances. + -- function and procedure instances. The flag Body_Optional has the + -- same purpose as described for Instantiate_Package_Body. + + function Need_Subprogram_Instance_Body + (N : Node_Id; + Subp : Entity_Id) return Boolean; + + -- If a subprogram instance is inlined, indicate that the body of it + -- must be created, to be used in inlined calls by the back-end. The + -- subprogram may be inlined because the generic itself carries the + -- pragma, or because a pragma appears for the instance in the scope. + -- of the instance. procedure Save_Global_References (N : Node_Id); -- Traverse the original generic unit, and capture all references to @@ -106,19 +144,37 @@ package Sem_Ch12 is -- an inlined body (so that errout can distinguish cases for generating -- error messages, otherwise the treatment is identical). In this call -- N is the subprogram body and E is the defining identifier of the - -- subprogram in quiestion. The resulting Sloc adjustment factor is + -- subprogram in question. The resulting Sloc adjustment factor is -- saved as part of the internal state of the Sem_Ch12 package for use -- in subsequent calls to copy nodes. procedure Save_Env (Gen_Unit : Entity_Id; Act_Unit : Entity_Id); - -- ??? comment needed + -- Because instantiations can be nested, the compiler maintains a stack + -- of environments that holds variables relevant to the current instance: + -- most importanty Instantiated_Parent, Exchanged_Views, Hidden_Entities, + -- and others (see full list in Instance_Env). procedure Restore_Env; - -- ??? comment needed + -- After processing an instantiation, or aborting one because of semantic + -- errors, remove the current Instantiation_Env from Instantation_Envs. procedure Initialize; -- Initializes internal data structures + procedure Check_Private_View (N : Node_Id); + -- Check whether the type of a generic entity has a different view between + -- the point of generic analysis and the point of instantiation. If the + -- view has changed, then at the point of instantiation we restore the + -- correct view to perform semantic analysis of the instance, and reset + -- the current view after instantiation. The processing is driven by the + -- current private status of the type of the node, and Has_Private_View, + -- a flag that is set at the point of generic compilation. If view and + -- flag are inconsistent then the type is updated appropriately. + -- + -- This subprogram is used in Check_Generic_Actuals and Copy_Generic_Node, + -- and is exported here for the purpose of front-end inlining (see Exp_Ch6. + -- Expand_Inlined_Call.Process_Formals). + end Sem_Ch12;