+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- S E M _ E L A B --
--- --
--- B o d y --
--- --
--- $Revision: 1.4.12.1 $
--- --
--- Copyright (C) 1997-2001 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- --
--- 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. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
-with Atree; use Atree;
-with Checks; use Checks;
-with Debug; use Debug;
-with Einfo; use Einfo;
-with Elists; use Elists;
-with Errout; use Errout;
-with Exp_Util; use Exp_Util;
-with Expander; use Expander;
-with Fname; use Fname;
-with Lib; use Lib;
-with Lib.Load; use Lib.Load;
-with Namet; use Namet;
-with Nlists; use Nlists;
-with Nmake; use Nmake;
-with Opt; use Opt;
-with Output; use Output;
-with Restrict; use Restrict;
-with Sem; use Sem;
-with Sem_Cat; use Sem_Cat;
-with Sem_Ch7; use Sem_Ch7;
-with Sem_Ch8; use Sem_Ch8;
-with Sem_Res; use Sem_Res;
-with Sem_Util; use Sem_Util;
-with Sinfo; use Sinfo;
-with Sinput; use Sinput;
-with Snames; use Snames;
-with Stand; use Stand;
-with Table;
-with Tbuild; use Tbuild;
-with Uname; use Uname;
-
-package body Sem_Elab is
-
- -- The following table records the recursive call chain for output
- -- in the Output routine. Each entry records the call node and the
- -- entity of the called routine. The number of entries in the table
- -- (i.e. the value of Elab_Call.Last) indicates the current depth
- -- of recursion and is used to identify the outer level.
-
- type Elab_Call_Entry is record
- Cloc : Source_Ptr;
- Ent : Entity_Id;
- end record;
-
- package Elab_Call is new Table.Table (
- Table_Component_Type => Elab_Call_Entry,
- Table_Index_Type => Int,
- Table_Low_Bound => 1,
- Table_Initial => 50,
- Table_Increment => 100,
- Table_Name => "Elab_Call");
-
- -- This table is initialized at the start of each outer level call.
- -- It holds the entities for all subprograms that have been examined
- -- for this particular outer level call, and is used to prevent both
- -- infinite recursion, and useless reanalysis of bodies already seen
-
- package Elab_Visited is new Table.Table (
- Table_Component_Type => Entity_Id,
- Table_Index_Type => Int,
- Table_Low_Bound => 1,
- Table_Initial => 200,
- Table_Increment => 100,
- Table_Name => "Elab_Visited");
-
- -- This table stores calls to Check_Internal_Call that are delayed
- -- until all generics are instantiated, and in particular that all
- -- generic bodies have been inserted. We need to delay, because we
- -- need to be able to look through the inserted bodies.
-
- type Delay_Element is record
- N : Node_Id;
- -- The parameter N from the call to Check_Internal_Call. Note that
- -- this node may get rewritten over the delay period by expansion
- -- in the call case (but not in the instantiation case).
-
- E : Entity_Id;
- -- The parameter E from the call to Check_Internal_Call
-
- Orig_Ent : Entity_Id;
- -- The parameter Orig_Ent from the call to Check_Internal_Call
-
- Curscop : Entity_Id;
- -- The current scope of the call. This is restored when we complete
- -- the delayed call, so that we do this in the right scope.
-
- From_Elab_Code : Boolean;
- -- Save indication of whether this call is from elaboration code
-
- Outer_Scope : Entity_Id;
- -- Save scope of outer level call
-
- end record;
-
- package Delay_Check is new Table.Table (
- Table_Component_Type => Delay_Element,
- Table_Index_Type => Int,
- Table_Low_Bound => 1,
- Table_Initial => 1000,
- Table_Increment => 100,
- Table_Name => "Delay_Check");
-
- C_Scope : Entity_Id;
- -- Top level scope of current scope. We need to compute this only
- -- once at the outer level, i.e. for a call to Check_Elab_Call from
- -- outside this unit.
-
- Outer_Level_Sloc : Source_Ptr;
- -- Save Sloc value for outer level call node for comparisons of source
- -- locations. A body is too late if it appears after the *outer* level
- -- call, not the particular call that is being analyzed.
-
- From_Elab_Code : Boolean;
- -- This flag shows whether the outer level call currently being examined
- -- is or is not in elaboration code. We are only interested in calls to
- -- routines in other units if this flag is True.
-
- In_Task_Activation : Boolean := False;
- -- This flag indicates whether we are performing elaboration checks on
- -- task procedures, at the point of activation. If true, we do not trace
- -- internal calls in these procedures, because all local bodies are known
- -- to be elaborated.
-
- Delaying_Elab_Checks : Boolean := True;
- -- This is set True till the compilation is complete, including the
- -- insertion of all instance bodies. Then when Check_Elab_Calls is
- -- called, the delay table is used to make the delayed calls and
- -- this flag is reset to False, so that the calls are processed
-
- -----------------------
- -- Local Subprograms --
- -----------------------
-
- -- Note: Outer_Scope in all these calls represents the scope of
- -- interest of the outer level call. If it is set to Standard_Standard,
- -- then it means the outer level call was at elaboration level, and that
- -- thus all calls are of interest. If it was set to some other scope,
- -- then the original call was an inner call, and we are not interested
- -- in calls that go outside this scope.
-
- procedure Check_A_Call
- (N : Node_Id;
- E : Entity_Id;
- Outer_Scope : Entity_Id;
- Inter_Unit_Only : Boolean;
- Generate_Warnings : Boolean := True);
- -- This is the internal recursive routine that is called to check for
- -- a possible elaboration error. The argument N is a subprogram call
- -- or generic instantiation to be checked, and E is the entity of
- -- the called subprogram, or instantiated generic unit. The flag
- -- Outer_Scope is the outer level scope for the original call.
- -- Inter_Unit_Only is set if the call is only to be checked in the
- -- case where it is to another unit (and skipped if within a unit).
- -- Generate_Warnings is set to True to suppress warning messages
- -- about missing pragma Elaborate_All's. These messages are not
- -- wanted for inner calls in the dynamic model.
-
- procedure Check_Bad_Instantiation (N : Node_Id);
- -- N is a node for an instantiation (if called with any other node kind,
- -- Check_Bad_Instantiation ignores the call). This subprogram checks for
- -- the special case of a generic instantiation of a generic spec in the
- -- same declarative part as the instantiation where a body is present and
- -- has not yet been seen. This is an obvious error, but needs to be checked
- -- specially at the time of the instantiation, since it is a case where we
- -- cannot insert the body anywhere. If this case is detected, warnings are
- -- generated, and a raise of Program_Error is inserted. In addition any
- -- subprograms in the generic spec are stubbed, and the Bad_Instantiation
- -- flag is set on the instantiation node. The caller in Sem_Ch12 uses this
- -- flag as an indication that no attempt should be made to insert an
- -- instance body.
-
- procedure Check_Internal_Call
- (N : Node_Id;
- E : Entity_Id;
- Outer_Scope : Entity_Id;
- Orig_Ent : Entity_Id);
- -- N is a function call or procedure statement call node and E is
- -- the entity of the called function, which is within the current
- -- compilation unit (where subunits count as part of the parent).
- -- This call checks if this call, or any call within any accessed
- -- body could cause an ABE, and if so, outputs a warning. Orig_Ent
- -- differs from E only in the case of renamings, and points to the
- -- original name of the entity. This is used for error messages.
- -- Outer_Scope is the outer level scope for the original call.
-
- procedure Check_Internal_Call_Continue
- (N : Node_Id;
- E : Entity_Id;
- Outer_Scope : Entity_Id;
- Orig_Ent : Entity_Id);
- -- The processing for Check_Internal_Call is divided up into two phases,
- -- and this represents the second phase. The second phase is delayed if
- -- Delaying_Elab_Calls is set to True. In this delayed case, the first
- -- phase makes an entry in the Delay_Check table, which is processed
- -- when Check_Elab_Calls is called. N, E and Orig_Ent are as for the call
- -- to Check_Internal_Call. Outer_Scope is the outer level scope for
- -- the original call.
-
- function Has_Generic_Body (N : Node_Id) return Boolean;
- -- N is a generic package instantiation node, and this routine determines
- -- if this package spec does in fact have a generic body. If so, then
- -- True is returned, otherwise False. Note that this is not at all the
- -- same as checking if the unit requires a body, since it deals with
- -- the case of optional bodies accurately (i.e. if a body is optional,
- -- then it looks to see if a body is actually present). Note: this
- -- function can only do a fully correct job if in generating code mode
- -- where all bodies have to be present. If we are operating in semantics
- -- check only mode, then in some cases of optional bodies, a result of
- -- False may incorrectly be given. In practice this simply means that
- -- some cases of warnings for incorrect order of elaboration will only
- -- be given when generating code, which is not a big problem (and is
- -- inevitable, given the optional body semantics of Ada).
-
- procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty);
- -- Given code for an elaboration check (or unconditional raise if
- -- the check is not needed), inserts the code in the appropriate
- -- place. N is the call or instantiation node for which the check
- -- code is required. C is the test whose failure triggers the raise.
-
- procedure Output_Calls (N : Node_Id);
- -- Outputs chain of calls stored in the Elab_Call table. The caller
- -- has already generated the main warning message, so the warnings
- -- generated are all continuation messages. The argument is the
- -- call node at which the messages are to be placed.
-
- function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean;
- -- Given two scopes, determine whether they are the same scope from an
- -- elaboration point of view, i.e. packages and blocks are ignored.
-
- procedure Set_C_Scope;
- -- On entry C_Scope is set to some scope. On return, C_Scope is reset
- -- to be the enclosing compilation unit of this scope.
-
- function Spec_Entity (E : Entity_Id) return Entity_Id;
- -- Given a compilation unit entity, if it is a spec entity, it is
- -- returned unchanged. If it is a body entity, then the spec for
- -- the corresponding spec is returned
-
- procedure Supply_Bodies (N : Node_Id);
- -- Given a node, N, that is either a subprogram declaration or a package
- -- declaration, this procedure supplies dummy bodies for the subprogram
- -- or for all subprograms in the package. If the given node is not one
- -- of these two possibilities, then Supply_Bodies does nothing. The
- -- dummy body is supplied by setting the subprogram to be Imported with
- -- convention Stubbed.
-
- procedure Supply_Bodies (L : List_Id);
- -- Calls Supply_Bodies for all elements of the given list L.
-
- function Within (E1, E2 : Entity_Id) return Boolean;
- -- Given two scopes E1 and E2, returns True if E1 is equal to E2, or
- -- is one of its contained scopes, False otherwise.
-
- ------------------
- -- Check_A_Call --
- ------------------
-
- procedure Check_A_Call
- (N : Node_Id;
- E : Entity_Id;
- Outer_Scope : Entity_Id;
- Inter_Unit_Only : Boolean;
- Generate_Warnings : Boolean := True)
- is
- Loc : constant Source_Ptr := Sloc (N);
- Ent : Entity_Id;
- Decl : Node_Id;
-
- E_Scope : Entity_Id;
- -- Top level scope of entity for called subprogram
-
- Body_Acts_As_Spec : Boolean;
- -- Set to true if call is to body acting as spec (no separate spec)
-
- Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
- -- Indicates if we have instantiation case
-
- Caller_Unit_Internal : Boolean;
- Callee_Unit_Internal : Boolean;
-
- Inst_Caller : Source_Ptr;
- Inst_Callee : Source_Ptr;
-
- Unit_Caller : Unit_Number_Type;
- Unit_Callee : Unit_Number_Type;
-
- Cunit_SW : Boolean := False;
- -- Set to suppress warnings for case of external reference where
- -- one of the enclosing scopes has the Suppress_Elaboration_Warnings
- -- flag set. For the internal case, we ignore this flag.
-
- Cunit_SC : Boolean := False;
- -- Set to suppress dynamic elaboration checks where one of the
- -- enclosing scopes has Suppress_Elaboration_Checks set. For
- -- the internal case, we ignore this flag.
-
- begin
- -- Go to parent for derived subprogram, or to original subprogram
- -- in the case of a renaming (Alias covers both these cases)
-
- Ent := E;
- loop
- if Suppress_Elaboration_Warnings (Ent) then
- return;
- end if;
-
- -- Nothing to do for imported entities,
-
- if Is_Imported (Ent) then
- return;
- end if;
-
- exit when Inst_Case or else No (Alias (Ent));
- Ent := Alias (Ent);
- end loop;
-
- Decl := Unit_Declaration_Node (Ent);
-
- if Nkind (Decl) = N_Subprogram_Body then
- Body_Acts_As_Spec := True;
-
- elsif Nkind (Decl) = N_Subprogram_Declaration
- or else Nkind (Decl) = N_Subprogram_Body_Stub
- or else Inst_Case
- then
- Body_Acts_As_Spec := False;
-
- -- If we have none of an instantiation, subprogram body or
- -- subprogram declaration, then it is not a case that we want
- -- to check. (One case is a call to a generic formal subprogram,
- -- where we do not want the check in the template).
-
- else
- return;
- end if;
-
- E_Scope := Ent;
- loop
- if Suppress_Elaboration_Warnings (E_Scope) then
- Cunit_SW := True;
- end if;
-
- if Suppress_Elaboration_Checks (E_Scope) then
- Cunit_SC := True;
- end if;
-
- -- Exit when we get to compilation unit, not counting subunits
-
- exit when Is_Compilation_Unit (E_Scope)
- and then (Is_Child_Unit (E_Scope)
- or else Scope (E_Scope) = Standard_Standard);
-
- -- If we did not find a compilation unit, other than standard,
- -- then nothing to check (happens in some instantiation cases)
-
- if E_Scope = Standard_Standard then
- return;
-
- -- Otherwise move up a scope looking for compilation unit
-
- else
- E_Scope := Scope (E_Scope);
- end if;
- end loop;
-
- -- No checks needed for pure or preelaborated compilation units
-
- if Is_Pure (E_Scope)
- or else Is_Preelaborated (E_Scope)
- then
- return;
- end if;
-
- -- If the generic entity is within a deeper instance than we are, then
- -- either the instantiation to which we refer itself caused an ABE, in
- -- which case that will be handled separately. Otherwise, we know that
- -- the body we need appears as needed at the point of the instantiation.
- -- However, this assumption is only valid if we are in static mode.
-
- if not Dynamic_Elaboration_Checks
- and then Instantiation_Depth (Sloc (Ent)) >
- Instantiation_Depth (Sloc (N))
- then
- return;
- end if;
-
- -- Do not give a warning for a package with no body
-
- if Ekind (Ent) = E_Generic_Package
- and then not Has_Generic_Body (N)
- then
- return;
- end if;
-
- -- Case of entity is not in current unit (i.e. with'ed unit case)
-
- if E_Scope /= C_Scope then
-
- -- We are only interested in such calls if the outer call was from
- -- elaboration code, or if we are in Dynamic_Elaboration_Checks mode.
-
- if not From_Elab_Code and then not Dynamic_Elaboration_Checks then
- return;
- end if;
-
- -- Nothing to do if some scope said to ignore warnings
-
- if Cunit_SW then
- return;
- end if;
-
- -- Nothing to do for a generic instance, because in this case
- -- the checking was at the point of instantiation of the generic
- -- However, this shortcut is only applicable in static mode.
-
- if Is_Generic_Instance (Ent) and not Dynamic_Elaboration_Checks then
- return;
- end if;
-
- -- Nothing to do if subprogram with no separate spec
-
- if Body_Acts_As_Spec then
- return;
- end if;
-
- -- Check cases of internal units
-
- Callee_Unit_Internal :=
- Is_Internal_File_Name
- (Unit_File_Name (Get_Source_Unit (E_Scope)));
-
- -- Do not give a warning if the with'ed unit is internal
- -- and this is the generic instantiation case (this saves a
- -- lot of hassle dealing with the Text_IO special child units)
-
- if Callee_Unit_Internal and Inst_Case then
- return;
- end if;
-
- if C_Scope = Standard_Standard then
- Caller_Unit_Internal := False;
- else
- Caller_Unit_Internal :=
- Is_Internal_File_Name
- (Unit_File_Name (Get_Source_Unit (C_Scope)));
- end if;
-
- -- Do not give a warning if the with'ed unit is internal
- -- and the caller is not internal (since the binder always
- -- elaborates internal units first).
-
- if Callee_Unit_Internal and (not Caller_Unit_Internal) then
- return;
- end if;
-
- -- For now, if debug flag -gnatdE is not set, do no checking for
- -- one internal unit withing another. This fixes the problem with
- -- the sgi build and storage errors. To be resolved later ???
-
- if (Callee_Unit_Internal and Caller_Unit_Internal)
- and then not Debug_Flag_EE
- then
- return;
- end if;
-
- Ent := E;
-
- -- If the call is in an instance, and the called entity is not
- -- defined in the same instance, then the elaboration issue
- -- focuses around the unit containing the template, it is
- -- this unit which requires an Elaborate_All.
-
- -- However, if we are doing dynamic elaboration, we need to
- -- chase the call in the usual manner.
-
- -- We do not handle the case of calling a generic formal correctly
- -- in the static case. See test 4703-004 to explore this gap ???
-
- Inst_Caller := Instantiation (Get_Source_File_Index (Sloc (N)));
- Inst_Callee := Instantiation (Get_Source_File_Index (Sloc (Ent)));
-
- if Inst_Caller = No_Location then
- Unit_Caller := No_Unit;
- else
- Unit_Caller := Get_Source_Unit (N);
- end if;
-
- if Inst_Callee = No_Location then
- Unit_Callee := No_Unit;
- else
- Unit_Callee := Get_Source_Unit (Ent);
- end if;
-
- if Unit_Caller /= No_Unit
- and then Unit_Callee /= Unit_Caller
- and then Unit_Callee /= No_Unit
- and then not Dynamic_Elaboration_Checks
- then
- E_Scope := Spec_Entity (Cunit_Entity (Unit_Caller));
-
- -- If we don't get a spec entity, just ignore call. Not
- -- quite clear why this check is necessary.
-
- if No (E_Scope) then
- return;
- end if;
-
- -- Otherwise step to enclosing compilation unit
-
- while not Is_Compilation_Unit (E_Scope) loop
- E_Scope := Scope (E_Scope);
- end loop;
-
- -- For the case of not in an instance, or call within instance
- -- We recompute E_Scope for the error message, since we
- -- do NOT want to go to the unit which has the ultimate
- -- declaration in the case of renaming and derivation and
- -- we also want to go to the generic unit in the case of
- -- an instance, and no further.
-
- else
- -- Loop to carefully follow renamings and derivations
- -- one step outside the current unit, but not further.
-
- if not Inst_Case
- and then Present (Alias (Ent))
- then
- E_Scope := Alias (Ent);
- else
- E_Scope := Ent;
- end if;
-
- loop
- while not Is_Compilation_Unit (E_Scope) loop
- E_Scope := Scope (E_Scope);
- end loop;
-
- -- If E_Scope is the same as C_Scope, it means that there
- -- definitely was a local renaming or derivation, and we
- -- are not yet out of the current unit.
-
- exit when E_Scope /= C_Scope;
- Ent := Alias (Ent);
- E_Scope := Ent;
- end loop;
- end if;
-
- if not Suppress_Elaboration_Warnings (Ent)
- and then not Suppress_Elaboration_Warnings (E_Scope)
- and then Elab_Warnings
- and then Generate_Warnings
- then
- Warn_On_Instance := True;
-
- if Inst_Case then
- Error_Msg_NE
- ("instantiation of& may raise Program_Error?", N, Ent);
- else
- Error_Msg_NE
- ("call to & may raise Program_Error?", N, Ent);
- end if;
-
- Error_Msg_Qual_Level := Nat'Last;
- Error_Msg_NE
- ("\missing pragma Elaborate_All for&?", N, E_Scope);
- Error_Msg_Qual_Level := 0;
- Output_Calls (N);
- Warn_On_Instance := False;
-
- -- Set flag to prevent further warnings for same unit
- -- unless in All_Errors_Mode.
-
- if not All_Errors_Mode and not Dynamic_Elaboration_Checks then
- Set_Suppress_Elaboration_Warnings (E_Scope);
- end if;
- end if;
-
- -- Check for runtime elaboration check required
-
- if Dynamic_Elaboration_Checks then
- if not Elaboration_Checks_Suppressed (Ent)
- and then not Suppress_Elaboration_Checks (E_Scope)
- and then not Cunit_SC
- then
- -- Runtime elaboration check required. generate check of the
- -- elaboration Boolean for the unit containing the entity.
-
- Insert_Elab_Check (N,
- Make_Attribute_Reference (Loc,
- Attribute_Name => Name_Elaborated,
- Prefix =>
- New_Occurrence_Of
- (Spec_Entity (E_Scope), Loc)));
- end if;
-
- -- If no dynamic check required, then ask binder to guarantee
- -- that the necessary elaborations will be done properly!
-
- else
- if not Suppress_Elaboration_Warnings (E)
- and then not Suppress_Elaboration_Warnings (E_Scope)
- and then Elab_Warnings
- and then Generate_Warnings
- and then not Inst_Case
- then
- Error_Msg_Node_2 := E_Scope;
- Error_Msg_NE ("call to& in elaboration code " &
- "requires pragma Elaborate_All on&?", N, E);
- end if;
-
- Set_Elaborate_All_Desirable (E_Scope);
- Set_Suppress_Elaboration_Warnings (E_Scope);
- end if;
-
- -- Case of entity is in same unit as call or instantiation
-
- elsif not Inter_Unit_Only then
- Check_Internal_Call (N, Ent, Outer_Scope, E);
- end if;
-
- end Check_A_Call;
-
- -----------------------------
- -- Check_Bad_Instantiation --
- -----------------------------
-
- procedure Check_Bad_Instantiation (N : Node_Id) is
- Nam : Node_Id;
- Ent : Entity_Id;
-
- begin
- -- Nothing to do if we do not have an instantiation (happens in some
- -- error cases, and also in the formal package declaration case)
-
- if Nkind (N) not in N_Generic_Instantiation then
- return;
-
- -- Nothing to do if errors already detected (avoid cascaded errors)
-
- elsif Errors_Detected /= 0 then
- return;
-
- -- Nothing to do if not in full analysis mode
-
- elsif not Full_Analysis then
- return;
-
- -- Nothing to do if inside a generic template
-
- elsif Inside_A_Generic then
- return;
-
- -- Nothing to do if a library level instantiation
-
- elsif Nkind (Parent (N)) = N_Compilation_Unit then
- return;
-
- -- Nothing to do if we are compiling a proper body for semantic
- -- purposes only. The generic body may be in another proper body.
-
- elsif
- Nkind (Parent (Unit_Declaration_Node (Main_Unit_Entity))) = N_Subunit
- then
- return;
- end if;
-
- Nam := Name (N);
- Ent := Entity (Nam);
-
- -- The case we are interested in is when the generic spec is in the
- -- current declarative part
-
- if not Same_Elaboration_Scope (Current_Scope, Scope (Ent))
- or else not In_Same_Extended_Unit (Sloc (N), Sloc (Ent))
- then
- return;
- end if;
-
- -- If the generic entity is within a deeper instance than we are, then
- -- either the instantiation to which we refer itself caused an ABE, in
- -- which case that will be handled separately. Otherwise, we know that
- -- the body we need appears as needed at the point of the instantiation.
- -- If they are both at the same level but not within the same instance
- -- then the body of the generic will be in the earlier instance.
-
- declare
- D1 : constant Int := Instantiation_Depth (Sloc (Ent));
- D2 : constant Int := Instantiation_Depth (Sloc (N));
-
- begin
- if D1 > D2 then
- return;
-
- elsif D1 = D2
- and then Is_Generic_Instance (Scope (Ent))
- and then not In_Open_Scopes (Scope (Ent))
- then
- return;
- end if;
- end;
-
- -- Now we can proceed, if the entity being called has a completion,
- -- then we are definitely OK, since we have already seen the body.
-
- if Has_Completion (Ent) then
- return;
- end if;
-
- -- If there is no body, then nothing to do
-
- if not Has_Generic_Body (N) then
- return;
- end if;
-
- -- Here we definitely have a bad instantiation
-
- Error_Msg_NE
- ("?cannot instantiate& before body seen", N, Ent);
-
- if Present (Instance_Spec (N)) then
- Supply_Bodies (Instance_Spec (N));
- end if;
-
- Error_Msg_N
- ("\?Program_Error will be raised at run time", N);
- Insert_Elab_Check (N);
- Set_ABE_Is_Certain (N);
-
- end Check_Bad_Instantiation;
-
- ---------------------
- -- Check_Elab_Call --
- ---------------------
-
- procedure Check_Elab_Call
- (N : Node_Id;
- Outer_Scope : Entity_Id := Empty)
- is
- Nam : Node_Id;
- Ent : Entity_Id;
- P : Node_Id;
-
- begin
- -- For an entry call, check relevant restriction
-
- if Nkind (N) = N_Entry_Call_Statement
- and then not In_Subprogram_Or_Concurrent_Unit
- then
- Check_Restriction (No_Entry_Calls_In_Elaboration_Code, N);
-
- -- Nothing to do if this is not a call (happens in some error
- -- conditions, and in some cases where rewriting occurs).
-
- elsif Nkind (N) /= N_Function_Call
- and then Nkind (N) /= N_Procedure_Call_Statement
- then
- return;
-
- -- Nothing to do if this is a call already rewritten for elab checking.
-
- elsif Nkind (Parent (N)) = N_Conditional_Expression then
- return;
-
- -- Nothing to do if inside a generic template
-
- elsif Inside_A_Generic
- and then not Present (Enclosing_Generic_Body (N))
- then
- return;
- end if;
-
- -- Here we have a call at elaboration time which must be checked
-
- if Debug_Flag_LL then
- Write_Str (" Check_Elab_Call: ");
-
- if No (Name (N))
- or else not Is_Entity_Name (Name (N))
- then
- Write_Str ("<<not entity name>> ");
- else
- Write_Name (Chars (Entity (Name (N))));
- end if;
-
- Write_Str (" call at ");
- Write_Location (Sloc (N));
- Write_Eol;
- end if;
-
- -- Climb up the tree to make sure we are not inside a
- -- default expression of a parameter specification or
- -- a record component, since in both these cases, we
- -- will be doing the actual call later, not now, and it
- -- is at the time of the actual call (statically speaking)
- -- that we must do our static check, not at the time of
- -- its initial analysis).
-
- P := Parent (N);
- while Present (P) loop
- if Nkind (P) = N_Parameter_Specification
- or else
- Nkind (P) = N_Component_Declaration
- then
- return;
- else
- P := Parent (P);
- end if;
- end loop;
-
- -- Stuff that happens only at the outer level
-
- if No (Outer_Scope) then
- Elab_Visited.Set_Last (0);
-
- -- Nothing to do if current scope is Standard (this is a bit
- -- odd, but it happens in the case of generic instantiations).
-
- C_Scope := Current_Scope;
-
- if C_Scope = Standard_Standard then
- return;
- end if;
-
- -- First case, we are in elaboration code
-
- From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
-
- if From_Elab_Code then
-
- -- Complain if call that comes from source in preelaborated
- -- unit and we are not inside a subprogram (i.e. we are in
- -- elab code)
-
- if Comes_From_Source (N)
- and then In_Preelaborated_Unit
- then
- Error_Msg_N
- ("non-static call not allowed in preelaborated unit", N);
- return;
- end if;
-
- -- Second case, we are inside a subprogram or concurrent unit
- -- i.e, we are not in elaboration code.
-
- else
- -- In this case, the issue is whether we are inside the
- -- declarative part of the unit in which we live, or inside
- -- its statements. In the latter case, there is no issue of
- -- ABE calls at this level (a call from outside to the unit
- -- in which we live might cause an ABE, but that will be
- -- detected when we analyze that outer level call, as it
- -- recurses into the called unit).
-
- -- Climb up the tree, doing this test, and also testing
- -- for being inside a default expression, which, as
- -- discussed above, is not checked at this stage.
-
- declare
- P : Node_Id;
- L : List_Id;
-
- begin
- P := N;
- loop
- -- If we find a parentless subtree, it seems safe to
- -- assume that we are not in a declarative part and
- -- that no checking is required.
-
- if No (P) then
- return;
- end if;
-
- if Is_List_Member (P) then
- L := List_Containing (P);
- P := Parent (L);
- else
- L := No_List;
- P := Parent (P);
- end if;
-
- exit when Nkind (P) = N_Subunit;
-
- -- Filter out case of default expressions, where
- -- we do not do the check at this stage.
-
- if Nkind (P) = N_Parameter_Specification
- or else
- Nkind (P) = N_Component_Declaration
- then
- return;
- end if;
-
- if Nkind (P) = N_Subprogram_Body
- or else
- Nkind (P) = N_Protected_Body
- or else
- Nkind (P) = N_Task_Body
- or else
- Nkind (P) = N_Block_Statement
- then
- if L = Declarations (P) then
- exit;
-
- -- We are not in elaboration code, but we are doing
- -- dynamic elaboration checks, in this case, we still
- -- need to do the call, since the subprogram we are in
- -- could be called from another unit, also in dynamic
- -- elaboration check mode, at elaboration time.
-
- elsif Dynamic_Elaboration_Checks then
-
- -- This is a rather new check, going into version
- -- 3.14a1 for the first time (V1.80 of this unit),
- -- so we provide a debug flag to enable it. That
- -- way we have an easy work around for regressions
- -- that are caused by this new check. This debug
- -- flag can be removed later.
-
- if Debug_Flag_DD then
- return;
- end if;
-
- -- Do the check in this case
-
- exit;
-
- -- Static model, call is not in elaboration code, we
- -- never need to worry, because in the static model
- -- the top level caller always takes care of things.
-
- else
- return;
- end if;
- end if;
- end loop;
- end;
- end if;
- end if;
-
- -- Retrieve called entity. If this is a call to a protected subprogram,
- -- the entity is a selected component.
- -- The callable entity may be absent, in which case there is nothing
- -- to do. This happens with non-analyzed calls in nested generics.
-
- Nam := Name (N);
-
- if No (Nam) then
- return;
-
- elsif Nkind (Nam) = N_Selected_Component then
- Ent := Entity (Selector_Name (Nam));
-
- elsif not Is_Entity_Name (Nam) then
- return;
-
- else
- Ent := Entity (Nam);
- end if;
-
- if No (Ent) then
- return;
- end if;
-
- -- Nothing to do if this is a recursive call (i.e. a call to
- -- an entity that is already in the Elab_Call stack)
-
- for J in 1 .. Elab_Visited.Last loop
- if Ent = Elab_Visited.Table (J) then
- return;
- end if;
- end loop;
-
- -- See if we need to analyze this call. We analyze it if either of
- -- the following conditions is met:
-
- -- It is an inner level call (since in this case it was triggered
- -- by an outer level call from elaboration code), but only if the
- -- call is within the scope of the original outer level call.
-
- -- It is an outer level call from elaboration code, or the called
- -- entity is in the same elaboration scope.
-
- -- And in these cases, we will check both inter-unit calls and
- -- intra-unit (within a single unit) calls.
-
- C_Scope := Current_Scope;
-
- -- If not outer level call, then we follow it if it is within
- -- the original scope of the outer call.
-
- if Present (Outer_Scope)
- and then Within (Scope (Ent), Outer_Scope)
- then
- Set_C_Scope;
- Check_A_Call (N, Ent, Outer_Scope, Inter_Unit_Only => False);
-
- elsif Elaboration_Checks_Suppressed (Current_Scope) then
- null;
-
- elsif From_Elab_Code then
- Set_C_Scope;
- Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
-
- elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
- Set_C_Scope;
- Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
-
- -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
- -- is set, then we will do the check, but only in the inter-unit case
- -- (this is to accommodate unguarded elaboration calls from other units
- -- in which this same mode is set). We don't want warnings in this case,
- -- it would generate warnings having nothing to do with elaboration.
-
- elsif Dynamic_Elaboration_Checks then
- Set_C_Scope;
- Check_A_Call
- (N,
- Ent,
- Standard_Standard,
- Inter_Unit_Only => True,
- Generate_Warnings => False);
-
- else
- return;
- end if;
- end Check_Elab_Call;
-
- ----------------------
- -- Check_Elab_Calls --
- ----------------------
-
- procedure Check_Elab_Calls is
- begin
- -- If expansion is disabled, do not generate any checks. Also
- -- skip checks if any subunits are missing because in either
- -- case we lack the full information that we need, and no object
- -- file will be created in any case.
-
- if not Expander_Active or else Subunits_Missing then
- return;
- end if;
-
- -- Skip delayed calls if we had any errors
-
- if Errors_Detected = 0 then
- Delaying_Elab_Checks := False;
- Expander_Mode_Save_And_Set (True);
-
- for J in Delay_Check.First .. Delay_Check.Last loop
- New_Scope (Delay_Check.Table (J).Curscop);
- From_Elab_Code := Delay_Check.Table (J).From_Elab_Code;
-
- Check_Internal_Call_Continue (
- N => Delay_Check.Table (J).N,
- E => Delay_Check.Table (J).E,
- Outer_Scope => Delay_Check.Table (J).Outer_Scope,
- Orig_Ent => Delay_Check.Table (J).Orig_Ent);
-
- Pop_Scope;
- end loop;
-
- -- Set Delaying_Elab_Checks back on for next main compilation
-
- Expander_Mode_Restore;
- Delaying_Elab_Checks := True;
- end if;
- end Check_Elab_Calls;
-
- ------------------------------
- -- Check_Elab_Instantiation --
- ------------------------------
-
- procedure Check_Elab_Instantiation
- (N : Node_Id;
- Outer_Scope : Entity_Id := Empty)
- is
- Nam : Node_Id;
- Ent : Entity_Id;
-
- begin
- -- Check for and deal with bad instantiation case. There is some
- -- duplicated code here, but we will worry about this later ???
-
- Check_Bad_Instantiation (N);
-
- if ABE_Is_Certain (N) then
- return;
- end if;
-
- -- Nothing to do if we do not have an instantiation (happens in some
- -- error cases, and also in the formal package declaration case)
-
- if Nkind (N) not in N_Generic_Instantiation then
- return;
- end if;
-
- -- Nothing to do if inside a generic template
-
- if Inside_A_Generic then
- return;
- end if;
-
- Nam := Name (N);
- Ent := Entity (Nam);
- From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
-
- -- See if we need to analyze this instantiation. We analyze it if
- -- either of the following conditions is met:
-
- -- It is an inner level instantiation (since in this case it was
- -- triggered by an outer level call from elaboration code), but
- -- only if the instantiation is within the scope of the original
- -- outer level call.
-
- -- It is an outer level instantiation from elaboration code, or the
- -- instantiated entity is in the same elaboratoin scope.
-
- -- And in these cases, we will check both the inter-unit case and
- -- the intra-unit (within a single unit) case.
-
- C_Scope := Current_Scope;
-
- if Present (Outer_Scope)
- and then Within (Scope (Ent), Outer_Scope)
- then
- Set_C_Scope;
- Check_A_Call (N, Ent, Outer_Scope, Inter_Unit_Only => False);
-
- elsif From_Elab_Code then
- Set_C_Scope;
- Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
-
- elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
- Set_C_Scope;
- Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
-
- -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
- -- is set, then we will do the check, but only in the inter-unit case
- -- (this is to accommodate unguarded elaboration calls from other units
- -- in which this same mode is set). We inhibit warnings in this case,
- -- since this instantiation is not occurring in elaboration code.
-
- elsif Dynamic_Elaboration_Checks then
- Set_C_Scope;
- Check_A_Call
- (N,
- Ent,
- Standard_Standard,
- Inter_Unit_Only => True,
- Generate_Warnings => False);
-
- else
- return;
- end if;
- end Check_Elab_Instantiation;
-
- -------------------------
- -- Check_Internal_Call --
- -------------------------
-
- procedure Check_Internal_Call
- (N : Node_Id;
- E : Entity_Id;
- Outer_Scope : Entity_Id;
- Orig_Ent : Entity_Id)
- is
- Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
-
- begin
- -- If not function or procedure call or instantiation, then ignore
- -- call (this happens in some error case and rewriting cases)
-
- if Nkind (N) /= N_Function_Call
- and then
- Nkind (N) /= N_Procedure_Call_Statement
- and then
- not Inst_Case
- then
- return;
-
- -- Nothing to do if this is a call or instantiation that has
- -- already been found to be a sure ABE
-
- elsif ABE_Is_Certain (N) then
- return;
-
- -- Nothing to do if errors already detected (avoid cascaded errors)
-
- elsif Errors_Detected /= 0 then
- return;
-
- -- Nothing to do if not in full analysis mode
-
- elsif not Full_Analysis then
- return;
-
- -- Nothing to do if within a default expression, since the call
- -- is not actualy being made at this time.
-
- elsif In_Default_Expression then
- return;
-
- -- Nothing to do for call to intrinsic subprogram
-
- elsif Is_Intrinsic_Subprogram (E) then
- return;
-
- -- No need to trace local calls if checking task activation, because
- -- other local bodies are elaborated already.
-
- elsif In_Task_Activation then
- return;
- end if;
-
- -- Delay this call if we are still delaying calls
-
- if Delaying_Elab_Checks then
- Delay_Check.Increment_Last;
- Delay_Check.Table (Delay_Check.Last) :=
- (N => N,
- E => E,
- Orig_Ent => Orig_Ent,
- Curscop => Current_Scope,
- Outer_Scope => Outer_Scope,
- From_Elab_Code => From_Elab_Code);
- return;
-
- -- Otherwise, call phase 2 continuation right now
-
- else
- Check_Internal_Call_Continue (N, E, Outer_Scope, Orig_Ent);
- end if;
-
- end Check_Internal_Call;
-
- ----------------------------------
- -- Check_Internal_Call_Continue --
- ----------------------------------
-
- procedure Check_Internal_Call_Continue
- (N : Node_Id;
- E : Entity_Id;
- Outer_Scope : Entity_Id;
- Orig_Ent : Entity_Id)
- is
- Loc : constant Source_Ptr := Sloc (N);
- Inst_Case : constant Boolean := Is_Generic_Unit (E);
-
- Sbody : Node_Id;
- Ebody : Entity_Id;
-
- function Process (N : Node_Id) return Traverse_Result;
- -- Function applied to each node as we traverse the body.
- -- Checks for call that needs checking, and if so checks
- -- it. Always returns OK, so entire tree is traversed.
-
- function Process (N : Node_Id) return Traverse_Result is
- begin
- -- If user has specified that there are no entry calls in elaboration
- -- code, do not trace past an accept statement, because the rendez-
- -- vous will happen after elaboration.
-
- if (Nkind (Original_Node (N)) = N_Accept_Statement
- or else Nkind (Original_Node (N)) = N_Selective_Accept)
- and then Restrictions (No_Entry_Calls_In_Elaboration_Code)
- then
- return Abandon;
-
- -- If we have a subprogram call, check it
-
- elsif Nkind (N) = N_Function_Call
- or else Nkind (N) = N_Procedure_Call_Statement
- then
- Check_Elab_Call (N, Outer_Scope);
- return OK;
-
- -- If we have a generic instantiation, check it
-
- elsif Nkind (N) in N_Generic_Instantiation then
- Check_Elab_Instantiation (N, Outer_Scope);
- return OK;
-
- -- Skip subprogram bodies that come from source (wait for
- -- call to analyze these). The reason for the come from
- -- source test is to avoid catching task bodies.
-
- -- For task bodies, we should really avoid these too, waiting
- -- for the task activation, but that's too much trouble to
- -- catch for now, so we go in unconditionally. This is not
- -- so terrible, it means the error backtrace is not quite
- -- complete, and we are too eager to scan bodies of tasks
- -- that are unused, but this is hardly very significant!
-
- elsif Nkind (N) = N_Subprogram_Body
- and then Comes_From_Source (N)
- then
- return Skip;
-
- else
- return OK;
- end if;
- end Process;
-
- procedure Traverse is new Atree.Traverse_Proc;
- -- Traverse procedure using above Process function
-
- -- Start of processing for Check_Internal_Call_Continue
-
- begin
- -- Save outer level call if at outer level
-
- if Elab_Call.Last = 0 then
- Outer_Level_Sloc := Loc;
- end if;
-
- Elab_Visited.Increment_Last;
- Elab_Visited.Table (Elab_Visited.Last) := E;
-
- -- If the call is to a function that renames a literal, no check
- -- is needed.
-
- if Ekind (E) = E_Enumeration_Literal then
- return;
- end if;
-
- Sbody := Unit_Declaration_Node (E);
-
- if Nkind (Sbody) /= N_Subprogram_Body
- and then
- Nkind (Sbody) /= N_Package_Body
- then
- Ebody := Corresponding_Body (Sbody);
-
- if No (Ebody) then
- return;
- else
- Sbody := Unit_Declaration_Node (Ebody);
- end if;
- end if;
-
- -- If the body appears after the outer level call or
- -- instantiation then we have an error case handled below.
-
- if Earlier_In_Extended_Unit (Outer_Level_Sloc, Sloc (Sbody))
- and then not In_Task_Activation
- then
- null;
-
- -- If we have the instantiation case we are done, since we now
- -- know that the body of the generic appeared earlier.
-
- elsif Inst_Case then
- return;
-
- -- Otherwise we have a call, so we trace through the called
- -- body to see if it has any problems ..
-
- else
- pragma Assert (Nkind (Sbody) = N_Subprogram_Body);
-
- Elab_Call.Increment_Last;
- Elab_Call.Table (Elab_Call.Last).Cloc := Loc;
- Elab_Call.Table (Elab_Call.Last).Ent := E;
-
- if Debug_Flag_LL then
- Write_Str ("Elab_Call.Last = ");
- Write_Int (Int (Elab_Call.Last));
- Write_Str (" Ent = ");
- Write_Name (Chars (E));
- Write_Str (" at ");
- Write_Location (Sloc (N));
- Write_Eol;
- end if;
-
- -- Now traverse declarations and statements of subprogram body.
- -- Note that we cannot simply Traverse (Sbody), since traverse
- -- does not normally visit subprogram bodies.
-
- declare
- Decl : Node_Id := First (Declarations (Sbody));
-
- begin
- while Present (Decl) loop
- Traverse (Decl);
- Next (Decl);
- end loop;
- end;
-
- Traverse (Handled_Statement_Sequence (Sbody));
-
- Elab_Call.Decrement_Last;
- return;
- end if;
-
- -- Here is the case of calling a subprogram where the body has
- -- not yet been encountered, a warning message is needed.
-
- Warn_On_Instance := True;
-
- -- If we have nothing in the call stack, then this is at the
- -- outer level, and the ABE is bound to occur.
-
- if Elab_Call.Last = 0 then
-
- if Inst_Case then
- Error_Msg_NE
- ("?cannot instantiate& before body seen", N, Orig_Ent);
- else
- Error_Msg_NE
- ("?cannot call& before body seen", N, Orig_Ent);
- end if;
-
- Error_Msg_N
- ("\?Program_Error will be raised at run time", N);
- Insert_Elab_Check (N);
-
- -- Call is not at outer level
-
- else
- -- Deal with dynamic elaboration check
-
- if not Elaboration_Checks_Suppressed (E) then
- Set_Elaboration_Entity_Required (E);
-
- -- Case of no elaboration entity allocated yet
-
- if No (Elaboration_Entity (E)) then
-
- -- Create object declaration for elaboration entity, and put it
- -- just in front of the spec of the subprogram or generic unit,
- -- in the same scope as this unit.
-
- declare
- Loce : constant Source_Ptr := Sloc (E);
- Ent : constant Entity_Id :=
- Make_Defining_Identifier (Loc,
- Chars => New_External_Name (Chars (E), 'E'));
-
- begin
- Set_Elaboration_Entity (E, Ent);
- New_Scope (Scope (E));
-
- Insert_Action (Declaration_Node (E),
- Make_Object_Declaration (Loce,
- Defining_Identifier => Ent,
- Object_Definition =>
- New_Occurrence_Of (Standard_Boolean, Loce),
- Expression => New_Occurrence_Of (Standard_False, Loce)));
-
- -- Set elaboration flag at the point of the body
-
- Set_Elaboration_Flag (Sbody, E);
-
- Pop_Scope;
- end;
- end if;
-
- -- Generate check of the elaboration Boolean
-
- Insert_Elab_Check (N,
- New_Occurrence_Of (Elaboration_Entity (E), Loc));
- end if;
-
- -- Generate the warning
-
- if not Suppress_Elaboration_Warnings (E) then
- if Inst_Case then
- Error_Msg_NE
- ("instantiation of& may occur before body is seen?",
- N, Orig_Ent);
- else
- Error_Msg_NE
- ("call to& may occur before body is seen?", N, Orig_Ent);
- end if;
-
- Error_Msg_N
- ("\Program_Error may be raised at run time?", N);
-
- Output_Calls (N);
- end if;
- end if;
-
- Warn_On_Instance := False;
-
- -- Set flag to suppress further warnings on same subprogram
- -- unless in all errors mode
-
- if not All_Errors_Mode then
- Set_Suppress_Elaboration_Warnings (E);
- end if;
- end Check_Internal_Call_Continue;
-
- ----------------------------
- -- Check_Task_Activation --
- ----------------------------
-
- procedure Check_Task_Activation (N : Node_Id) is
- Loc : constant Source_Ptr := Sloc (N);
- Ent : Entity_Id;
- P : Entity_Id;
- Task_Scope : Entity_Id;
- Cunit_SC : Boolean := False;
- Decl : Node_Id;
- Elmt : Elmt_Id;
- Inter_Procs : Elist_Id := New_Elmt_List;
- Intra_Procs : Elist_Id := New_Elmt_List;
- Enclosing : Entity_Id;
-
- procedure Add_Task_Proc (Typ : Entity_Id);
- -- Add to Task_Procs the task body procedure(s) of task types in Typ.
- -- For record types, this procedure recurses over component types.
-
- procedure Collect_Tasks (Decls : List_Id);
- -- Collect the types of the tasks that are to be activated in the given
- -- list of declarations, in order to perform elaboration checks on the
- -- corresponding task procedures which are called implicitly here.
-
- function Outer_Unit (E : Entity_Id) return Entity_Id;
- -- find enclosing compilation unit of Entity, ignoring subunits, or
- -- else enclosing subprogram. If E is not a package, there is no need
- -- for inter-unit elaboration checks.
-
- -------------------
- -- Add_Task_Proc --
- -------------------
-
- procedure Add_Task_Proc (Typ : Entity_Id) is
- Comp : Entity_Id;
- Proc : Entity_Id := Empty;
-
- begin
- if Is_Task_Type (Typ) then
- Proc := Get_Task_Body_Procedure (Typ);
-
- elsif Is_Array_Type (Typ)
- and then Has_Task (Base_Type (Typ))
- then
- Add_Task_Proc (Component_Type (Typ));
-
- elsif Is_Record_Type (Typ)
- and then Has_Task (Base_Type (Typ))
- then
- Comp := First_Component (Typ);
-
- while Present (Comp) loop
- Add_Task_Proc (Etype (Comp));
- Comp := Next_Component (Comp);
- end loop;
- end if;
-
- -- If the task type is another unit, we will perform the usual
- -- elaboration check on its enclosing unit. If the type is in the
- -- same unit, we can trace the task body as for an internal call,
- -- but we only need to examine other external calls, because at
- -- the point the task is activated, internal subprogram bodies
- -- will have been elaborated already. We keep separate lists for
- -- each kind of task.
-
- if Present (Proc) then
- if Outer_Unit (Scope (Proc)) = Enclosing then
-
- if No (Corresponding_Body (Unit_Declaration_Node (Proc)))
- and then
- (not Is_Generic_Instance (Scope (Proc))
- or else
- Scope (Proc) = Scope (Defining_Identifier (Decl)))
- then
- Error_Msg_N
- ("task will be activated before elaboration of its body?",
- Decl);
- Error_Msg_N
- ("Program_Error will be raised at run-time?", Decl);
-
- elsif
- Present (Corresponding_Body (Unit_Declaration_Node (Proc)))
- then
- Append_Elmt (Proc, Intra_Procs);
- end if;
-
- else
- Elmt := First_Elmt (Inter_Procs);
-
- -- No need for multiple entries of the same type.
-
- while Present (Elmt) loop
- if Node (Elmt) = Proc then
- return;
- end if;
-
- Next_Elmt (Elmt);
- end loop;
-
- Append_Elmt (Proc, Inter_Procs);
- end if;
- end if;
- end Add_Task_Proc;
-
- -------------------
- -- Collect_Tasks --
- -------------------
-
- procedure Collect_Tasks (Decls : List_Id) is
- begin
- if Present (Decls) then
- Decl := First (Decls);
-
- while Present (Decl) loop
-
- if Nkind (Decl) = N_Object_Declaration
- and then Has_Task (Etype (Defining_Identifier (Decl)))
- then
- Add_Task_Proc (Etype (Defining_Identifier (Decl)));
- end if;
-
- Next (Decl);
- end loop;
- end if;
- end Collect_Tasks;
-
- ----------------
- -- Outer_Unit --
- ----------------
-
- function Outer_Unit (E : Entity_Id) return Entity_Id is
- Outer : Entity_Id := E;
-
- begin
- while Present (Outer) loop
- if Suppress_Elaboration_Checks (Outer) then
- Cunit_SC := True;
- end if;
-
- exit when Is_Child_Unit (Outer)
- or else Scope (Outer) = Standard_Standard
- or else Ekind (Outer) /= E_Package;
- Outer := Scope (Outer);
- end loop;
-
- return Outer;
- end Outer_Unit;
-
- -- Start of processing for Check_Task_Activation
-
- begin
- Enclosing := Outer_Unit (Current_Scope);
-
- -- Find all tasks declared in the current unit.
-
- if Nkind (N) = N_Package_Body then
- P := Unit_Declaration_Node (Corresponding_Spec (N));
-
- Collect_Tasks (Declarations (N));
- Collect_Tasks (Visible_Declarations (Specification (P)));
- Collect_Tasks (Private_Declarations (Specification (P)));
-
- elsif Nkind (N) = N_Package_Declaration then
- Collect_Tasks (Visible_Declarations (Specification (N)));
- Collect_Tasks (Private_Declarations (Specification (N)));
-
- else
- Collect_Tasks (Declarations (N));
- end if;
-
- -- We only perform detailed checks in all tasks are library level
- -- entities. If the master is a subprogram or task, activation will
- -- depend on the activation of the master itself.
- -- Should dynamic checks be added in the more general case???
-
- if Ekind (Enclosing) /= E_Package then
- return;
- end if;
-
- -- For task types defined in other units, we want the unit containing
- -- the task body to be elaborated before the current one.
-
- Elmt := First_Elmt (Inter_Procs);
-
- while Present (Elmt) loop
- Ent := Node (Elmt);
- Task_Scope := Outer_Unit (Scope (Ent));
-
- if not Is_Compilation_Unit (Task_Scope) then
- null;
-
- elsif Suppress_Elaboration_Warnings (Task_Scope) then
- null;
-
- elsif Dynamic_Elaboration_Checks then
- if not Elaboration_Checks_Suppressed (Ent)
- and then not Cunit_SC
- and then not Restrictions (No_Entry_Calls_In_Elaboration_Code)
- then
- -- Runtime elaboration check required. generate check of the
- -- elaboration Boolean for the unit containing the entity.
-
- Insert_Elab_Check (N,
- Make_Attribute_Reference (Loc,
- Attribute_Name => Name_Elaborated,
- Prefix =>
- New_Occurrence_Of
- (Spec_Entity (Task_Scope), Loc)));
- end if;
-
- else
- -- Force the binder to elaborate other unit first.
-
- if not Suppress_Elaboration_Warnings (Ent)
- and then Elab_Warnings
- and then not Suppress_Elaboration_Warnings (Task_Scope)
- then
- Error_Msg_Node_2 := Task_Scope;
- Error_Msg_NE ("activation of an instance of task type&" &
- " requires pragma Elaborate_All on &?", N, Ent);
- end if;
-
- Set_Elaborate_All_Desirable (Task_Scope);
- Set_Suppress_Elaboration_Warnings (Task_Scope);
- end if;
-
- Next_Elmt (Elmt);
- end loop;
-
- -- For tasks declared in the current unit, trace other calls within
- -- the task procedure bodies, which are available.
-
- In_Task_Activation := True;
- Elmt := First_Elmt (Intra_Procs);
-
- while Present (Elmt) loop
- Ent := Node (Elmt);
- Check_Internal_Call_Continue (N, Ent, Enclosing, Ent);
- Next_Elmt (Elmt);
- end loop;
-
- In_Task_Activation := False;
- end Check_Task_Activation;
-
- ----------------------
- -- Has_Generic_Body --
- ----------------------
-
- function Has_Generic_Body (N : Node_Id) return Boolean is
- Ent : constant Entity_Id := Entity (Name (N));
- Decl : constant Node_Id := Unit_Declaration_Node (Ent);
- Scop : Entity_Id;
-
- function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id;
- -- Determine if the list of nodes headed by N and linked by Next
- -- contains a package body for the package spec entity E, and if
- -- so return the package body. If not, then returns Empty.
-
- function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id;
- -- This procedure is called load the unit whose name is given by Nam.
- -- This unit is being loaded to see whether it contains an optional
- -- generic body. The returned value is the loaded unit, which is
- -- always a package body (only package bodies can contain other
- -- entities in the sense in which Has_Generic_Body is interested).
- -- We only attempt to load bodies if we are generating code. If we
- -- are in semantics check only mode, then it would be wrong to load
- -- bodies that are not required from a semantic point of view, so
- -- in this case we return Empty. The result is that the caller may
- -- incorrectly decide that a generic spec does not have a body when
- -- in fact it does, but the only harm in this is that some warnings
- -- on elaboration problems may be lost in semantic checks only mode,
- -- which is not big loss. We also return Empty if we go for a body
- -- and it is not there.
-
- function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id;
- -- PE is the entity for a package spec. This function locates the
- -- corresponding package body, returning Empty if none is found.
- -- The package body returned is fully parsed but may not yet be
- -- analyzed, so only syntactic fields should be referenced.
-
- ------------------
- -- Find_Body_In --
- ------------------
-
- function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id is
- Nod : Node_Id;
-
- begin
- Nod := N;
- while Present (Nod) loop
-
- -- If we found the package body we are looking for, return it
-
- if Nkind (Nod) = N_Package_Body
- and then Chars (Defining_Unit_Name (Nod)) = Chars (E)
- then
- return Nod;
-
- -- If we found the stub for the body, go after the subunit,
- -- loading it if necessary.
-
- elsif Nkind (Nod) = N_Package_Body_Stub
- and then Chars (Defining_Identifier (Nod)) = Chars (E)
- then
- if Present (Library_Unit (Nod)) then
- return Unit (Library_Unit (Nod));
-
- else
- return Load_Package_Body (Get_Unit_Name (Nod));
- end if;
-
- -- If neither package body nor stub, keep looking on chain
-
- else
- Next (Nod);
- end if;
- end loop;
-
- return Empty;
- end Find_Body_In;
-
- -----------------------
- -- Load_Package_Body --
- -----------------------
-
- function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id is
- U : Unit_Number_Type;
-
- begin
- if Operating_Mode /= Generate_Code then
- return Empty;
- else
- U :=
- Load_Unit
- (Load_Name => Nam,
- Required => False,
- Subunit => False,
- Error_Node => N);
-
- if U = No_Unit then
- return Empty;
- else
- return Unit (Cunit (U));
- end if;
- end if;
- end Load_Package_Body;
-
- -------------------------------
- -- Locate_Corresponding_Body --
- -------------------------------
-
- function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id is
- Spec : constant Node_Id := Declaration_Node (PE);
- Decl : constant Node_Id := Parent (Spec);
- Scop : constant Entity_Id := Scope (PE);
- PBody : Node_Id;
-
- begin
- if Is_Library_Level_Entity (PE) then
-
- -- If package is a library unit that requires a body, we have
- -- no choice but to go after that body because it might contain
- -- an optional body for the original generic package.
-
- if Unit_Requires_Body (PE) then
-
- -- Load the body. Note that we are a little careful here to
- -- use Spec to get the unit number, rather than PE or Decl,
- -- since in the case where the package is itself a library
- -- level instantiation, Spec will properly reference the
- -- generic template, which is what we really want.
-
- return
- Load_Package_Body
- (Get_Body_Name (Unit_Name (Get_Source_Unit (Spec))));
-
- -- But if the package is a library unit that does NOT require
- -- a body, then no body is permitted, so we are sure that there
- -- is no body for the original generic package.
-
- else
- return Empty;
- end if;
-
- -- Otherwise look and see if we are embedded in a further package
-
- elsif Is_Package (Scop) then
-
- -- If so, get the body of the enclosing package, and look in
- -- its package body for the package body we are looking for.
-
- PBody := Locate_Corresponding_Body (Scop);
-
- if No (PBody) then
- return Empty;
- else
- return Find_Body_In (PE, First (Declarations (PBody)));
- end if;
-
- -- If we are not embedded in a further package, then the body
- -- must be in the same declarative part as we are.
-
- else
- return Find_Body_In (PE, Next (Decl));
- end if;
- end Locate_Corresponding_Body;
-
- -- Start of processing for Has_Generic_Body
-
- begin
- if Present (Corresponding_Body (Decl)) then
- return True;
-
- elsif Unit_Requires_Body (Ent) then
- return True;
-
- -- Compilation units cannot have optional bodies
-
- elsif Is_Compilation_Unit (Ent) then
- return False;
-
- -- Otherwise look at what scope we are in
-
- else
- Scop := Scope (Ent);
-
- -- Case of entity is in other than a package spec, in this case
- -- the body, if present, must be in the same declarative part.
-
- if not Is_Package (Scop) then
- declare
- P : Node_Id;
-
- begin
- P := Declaration_Node (Ent);
-
- -- Declaration node may get us a spec, so if so, go to
- -- the parent declaration.
-
- while not Is_List_Member (P) loop
- P := Parent (P);
- end loop;
-
- return Present (Find_Body_In (Ent, Next (P)));
- end;
-
- -- If the entity is in a package spec, then we have to locate
- -- the corresponding package body, and look there.
-
- else
- declare
- PBody : constant Node_Id := Locate_Corresponding_Body (Scop);
-
- begin
- if No (PBody) then
- return False;
- else
- return
- Present
- (Find_Body_In (Ent, (First (Declarations (PBody)))));
- end if;
- end;
- end if;
- end if;
- end Has_Generic_Body;
-
- -----------------------
- -- Insert_Elab_Check --
- -----------------------
-
- procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty) is
- Nod : Node_Id;
- Loc : constant Source_Ptr := Sloc (N);
-
- begin
- -- If expansion is disabled, do not generate any checks. Also
- -- skip checks if any subunits are missing because in either
- -- case we lack the full information that we need, and no object
- -- file will be created in any case.
-
- if not Expander_Active or else Subunits_Missing then
- return;
- end if;
-
- -- If we have a generic instantiation, where Instance_Spec is set,
- -- then this field points to a generic instance spec that has
- -- been inserted before the instantiation node itself, so that
- -- is where we want to insert a check.
-
- if Nkind (N) in N_Generic_Instantiation
- and then Present (Instance_Spec (N))
- then
- Nod := Instance_Spec (N);
- else
- Nod := N;
- end if;
-
- -- If we are inserting at the top level, insert in Aux_Decls
-
- if Nkind (Parent (Nod)) = N_Compilation_Unit then
- declare
- ADN : constant Node_Id := Aux_Decls_Node (Parent (Nod));
- R : Node_Id;
-
- begin
- if No (C) then
- R := Make_Raise_Program_Error (Loc);
- else
- R := Make_Raise_Program_Error (Loc, Make_Op_Not (Loc, C));
- end if;
-
- if No (Declarations (ADN)) then
- Set_Declarations (ADN, New_List (R));
- else
- Append_To (Declarations (ADN), R);
- end if;
-
- Analyze (R);
- end;
-
- -- Otherwise just insert before the node in question. However, if
- -- the context of the call has already been analyzed, an insertion
- -- will not work if it depends on subsequent expansion (e.g. a call in
- -- a branch of a short-circuit). In that case we replace the call with
- -- a conditional expression, or with a Raise if it is unconditional.
- -- Unfortunately this does not work if the call has a dynamic size,
- -- because gigi regards it as a dynamic-sized temporary. If such a call
- -- appears in a short-circuit expression, the elaboration check will be
- -- missed (rare enough ???).
-
- else
- if Nkind (N) = N_Function_Call
- and then Analyzed (Parent (N))
- and then Size_Known_At_Compile_Time (Etype (N))
- then
- declare
- Typ : constant Entity_Id := Etype (N);
- R : constant Node_Id := Make_Raise_Program_Error (Loc);
- Chk : constant Boolean := Do_Range_Check (N);
-
- begin
- Set_Etype (R, Typ);
-
- if No (C) then
- Rewrite (N, R);
-
- else
- Rewrite (N,
- Make_Conditional_Expression (Loc,
- Expressions => New_List (C, Relocate_Node (N), R)));
- end if;
-
- Analyze_And_Resolve (N, Typ);
-
- -- If the original call requires a range check, so does the
- -- conditional expression.
-
- if Chk then
- Enable_Range_Check (N);
- else
- Set_Do_Range_Check (N, False);
- end if;
- end;
-
- else
- if No (C) then
- Insert_Action (Nod,
- Make_Raise_Program_Error (Loc));
- else
- Insert_Action (Nod,
- Make_Raise_Program_Error (Loc,
- Condition =>
- Make_Op_Not (Loc,
- Right_Opnd => C)));
- end if;
- end if;
- end if;
- end Insert_Elab_Check;
-
- ------------------
- -- Output_Calls --
- ------------------
-
- procedure Output_Calls (N : Node_Id) is
- Ent : Entity_Id;
-
- function Is_Printable_Error_Name (Nm : Name_Id) return Boolean;
- -- An internal function, used to determine if a name, Nm, is either
- -- a non-internal name, or is an internal name that is printable
- -- by the error message circuits (i.e. it has a single upper
- -- case letter at the end).
-
- function Is_Printable_Error_Name (Nm : Name_Id) return Boolean is
- begin
- if not Is_Internal_Name (Nm) then
- return True;
-
- elsif Name_Len = 1 then
- return False;
-
- else
- Name_Len := Name_Len - 1;
- return not Is_Internal_Name;
- end if;
- end Is_Printable_Error_Name;
-
- -- Start of processing for Output_Calls
-
- begin
- for J in reverse 1 .. Elab_Call.Last loop
- Error_Msg_Sloc := Elab_Call.Table (J).Cloc;
-
- Ent := Elab_Call.Table (J).Ent;
-
- if Is_Generic_Unit (Ent) then
- Error_Msg_NE ("\?& instantiated #", N, Ent);
-
- elsif Chars (Ent) = Name_uInit_Proc then
- Error_Msg_N ("\?initialization procedure called #", N);
-
- elsif Is_Printable_Error_Name (Chars (Ent)) then
- Error_Msg_NE ("\?& called #", N, Ent);
-
- else
- Error_Msg_N ("\? called #", N);
- end if;
- end loop;
- end Output_Calls;
-
- ----------------------------
- -- Same_Elaboration_Scope --
- ----------------------------
-
- function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean is
- S1 : Entity_Id := Scop1;
- S2 : Entity_Id := Scop2;
-
- begin
- while S1 /= Standard_Standard
- and then (Ekind (S1) = E_Package
- or else
- Ekind (S1) = E_Block)
- loop
- S1 := Scope (S1);
- end loop;
-
- while S2 /= Standard_Standard
- and then (Ekind (S2) = E_Package
- or else
- Ekind (S2) = E_Protected_Type
- or else
- Ekind (S2) = E_Block)
- loop
- S2 := Scope (S2);
- end loop;
-
- return S1 = S2;
- end Same_Elaboration_Scope;
-
- -----------------
- -- Set_C_Scope --
- -----------------
-
- procedure Set_C_Scope is
- begin
- while not Is_Compilation_Unit (C_Scope) loop
- C_Scope := Scope (C_Scope);
- end loop;
- end Set_C_Scope;
-
- -----------------
- -- Spec_Entity --
- -----------------
-
- function Spec_Entity (E : Entity_Id) return Entity_Id is
- Decl : Node_Id;
-
- begin
- -- Check for case of body entity
- -- Why is the check for E_Void needed???
-
- if Ekind (E) = E_Void
- or else Ekind (E) = E_Subprogram_Body
- or else Ekind (E) = E_Package_Body
- then
- Decl := E;
-
- loop
- Decl := Parent (Decl);
- exit when Nkind (Decl) in N_Proper_Body;
- end loop;
-
- return Corresponding_Spec (Decl);
-
- else
- return E;
- end if;
- end Spec_Entity;
-
- -------------------
- -- Supply_Bodies --
- -------------------
-
- procedure Supply_Bodies (N : Node_Id) is
- begin
- if Nkind (N) = N_Subprogram_Declaration then
- declare
- Ent : constant Entity_Id := Defining_Unit_Name (Specification (N));
-
- begin
- Set_Is_Imported (Ent);
- Set_Convention (Ent, Convention_Stubbed);
- end;
-
- elsif Nkind (N) = N_Package_Declaration then
- declare
- Spec : constant Node_Id := Specification (N);
-
- begin
- New_Scope (Defining_Unit_Name (Spec));
- Supply_Bodies (Visible_Declarations (Spec));
- Supply_Bodies (Private_Declarations (Spec));
- Pop_Scope;
- end;
- end if;
- end Supply_Bodies;
-
- procedure Supply_Bodies (L : List_Id) is
- Elmt : Node_Id;
-
- begin
- if Present (L) then
- Elmt := First (L);
- while Present (Elmt) loop
- Supply_Bodies (Elmt);
- Next (Elmt);
- end loop;
- end if;
- end Supply_Bodies;
-
- ------------
- -- Within --
- ------------
-
- function Within (E1, E2 : Entity_Id) return Boolean is
- Scop : Entity_Id;
-
- begin
- Scop := E1;
-
- loop
- if Scop = E2 then
- return True;
-
- elsif Scop = Standard_Standard then
- return False;
-
- else
- Scop := Scope (Scop);
- end if;
- end loop;
-
- raise Program_Error;
- end Within;
-
-end Sem_Elab;
projects / msp430-gcc.git / blobdiff