-- --
-- B o d y --
-- --
--- Copyright (C) 1997-2006, Free Software Foundation, Inc. --
+-- Copyright (C) 1997-2011, 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, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, 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. --
with Restrict; use Restrict;
with Rident; use Rident;
with Sem; use Sem;
+with Sem_Aux; use Sem_Aux;
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_Type; use Sem_Type;
with Sem_Util; use Sem_Util;
with Sinfo; use Sinfo;
with Sinput; use Sinput;
with Stand; use Stand;
with Table;
with Tbuild; use Tbuild;
+with Uintp; use Uintp;
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.
+ -- 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;
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
+ -- 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_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.
+ -- Top level scope of current scope. 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
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
+ -- 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 --
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 False to suppress warning messages
- -- about missing pragma Elaborate_All's. These messages are not
- -- wanted for inner calls in the dynamic model.
+ Generate_Warnings : Boolean := True;
+ In_Init_Proc : Boolean := False);
+ -- 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 False to suppress
+ -- warning messages about missing pragma Elaborate_All's. These messages
+ -- are not wanted for inner calls in the dynamic model. Flag In_Init_Proc
+ -- should be set whenever the current context is a type init proc.
procedure Check_Bad_Instantiation (N : Node_Id);
-- N is a node for an instantiation (if called with any other node kind,
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.
+ -- 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;
-- 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.
-
- procedure Set_Elaboration_Constraint
- (Call : Node_Id;
- Subp : Entity_Id;
- Scop : Entity_Id);
- -- The current unit U may depend semantically on some unit P which is not
- -- in the current context. If there is an elaboration call that reaches P,
- -- we need to indicate that P requires an Elaborate_All, but this is not
- -- effective in U's ali file, if there is no with_clause for P. In this
- -- case we add the Elaborate_All on the unit Q that directly or indirectly
- -- makes P available. This can happen in two cases:
- --
- -- a) Q declares a subtype of a type declared in P, and the call is an
- -- initialization call for an object of that subtype.
- --
- -- b) Q declares an object of some tagged type whose root type is
- -- declared in P, and the initialization call uses object notation on
- -- that object to reach a primitive operation or a classwide operation
- -- declared in P.
- --
- -- If P appears in the context of U, the current processing is correct.
- -- Otherwise we must identify these two cases to retrieve Q and place the
- -- Elaborate_All_Desirable on it.
+ -- 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
-- 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.
+ -- 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.
+
+ function Is_Finalization_Procedure (Id : Entity_Id) return Boolean;
+ -- Determine whether entity Id denotes a [Deep_]Finalize procedure
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.
+ -- 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
-- On entry C_Scope is set to some scope. On return, C_Scope is reset
-- to be the enclosing compilation unit of this scope.
+ procedure Set_Elaboration_Constraint
+ (Call : Node_Id;
+ Subp : Entity_Id;
+ Scop : Entity_Id);
+ -- The current unit U may depend semantically on some unit P which is not
+ -- in the current context. If there is an elaboration call that reaches P,
+ -- we need to indicate that P requires an Elaborate_All, but this is not
+ -- effective in U's ali file, if there is no with_clause for P. In this
+ -- case we add the Elaborate_All on the unit Q that directly or indirectly
+ -- makes P available. This can happen in two cases:
+ --
+ -- a) Q declares a subtype of a type declared in P, and the call is an
+ -- initialization call for an object of that subtype.
+ --
+ -- b) Q declares an object of some tagged type whose root type is
+ -- declared in P, and the initialization call uses object notation on
+ -- that object to reach a primitive operation or a classwide operation
+ -- declared in P.
+ --
+ -- If P appears in the context of U, the current processing is correct.
+ -- Otherwise we must identify these two cases to retrieve Q and place the
+ -- Elaborate_All_Desirable on it.
+
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
+ -- 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.
+ -- dummy body contains a single Raise statement.
procedure Supply_Bodies (L : List_Id);
-- Calls Supply_Bodies for all elements of the given list L
E : Entity_Id;
Outer_Scope : Entity_Id;
Inter_Unit_Only : Boolean;
- Generate_Warnings : Boolean := True)
+ Generate_Warnings : Boolean := True;
+ In_Init_Proc : Boolean := False)
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. This
- -- value includes following renamings and derivations, so
- -- this scope can be in a non-visible unit. This is the
- -- scope that is to be investigated to see whether an
- -- elaboration check is required.
+ -- Top level scope of entity for called subprogram. This value includes
+ -- following renamings and derivations, so this scope can be in a
+ -- non-visible unit. This is the scope that is to be investigated to
+ -- see whether an elaboration check is required.
W_Scope : Entity_Id;
-- Top level scope of directly called entity for subprogram. This
-- calls and calls involving object notation) where W_Scope might not
-- be in the context of the current unit, and there is an intermediate
-- package that is, in which case the Elaborate_All has to be placed
- -- on this intedermediate package. These special cases are handled in
+ -- on this intermediate package. These special cases are handled in
-- Set_Elaboration_Constraint.
Body_Acts_As_Spec : Boolean;
return;
end if;
- -- Go to parent for derived subprogram, or to original subprogram
- -- in the case of a renaming (Alias covers both these cases)
+ -- Go to parent for derived subprogram, or to original subprogram in the
+ -- case of a renaming (Alias covers both these cases).
Ent := E;
loop
-- No checks needed for pure or preelaborated compilation units
- if Is_Pure (E_Scope)
- or else Is_Preelaborated (E_Scope)
- then
+ if Is_Pure (E_Scope) or else Is_Preelaborated (E_Scope) then
return;
end if;
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.
+ -- 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. However,
- -- a call to Deep_Initialize may result in a call to a user-defined
+ -- Nothing to do if subprogram with no separate spec. However, a
+ -- call to Deep_Initialize may result in a call to a user-defined
-- Initialize procedure, which imposes a body dependency. This
-- happens only if the type is controlled and the Initialize
-- procedure is not inherited.
if Body_Acts_As_Spec then
if Is_TSS (Ent, TSS_Deep_Initialize) then
declare
- Typ : Entity_Id;
+ Typ : constant Entity_Id := Etype (First_Formal (Ent));
Init : Entity_Id;
- begin
- Typ := Etype (Next_Formal (First_Formal (Ent)));
+ begin
if not Is_Controlled (Typ) then
return;
else
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 we don't get a spec entity, just ignore call. Not quite
+ -- clear why this check is necessary. ???
if No (E_Scope) then
return;
E_Scope := Scope (E_Scope);
end loop;
- -- For the case N is not an instance, or a 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.
+ -- For the case N is not an instance, or a 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.
+ -- 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))
and then Elab_Warnings
and then Generate_Warnings
then
- if Inst_Case then
- Error_Msg_NE
- ("instantiation of& may raise Program_Error?", N, Ent);
+ Generate_Elab_Warnings : declare
+ procedure Elab_Warning
+ (Msg_D : String;
+ Msg_S : String;
+ Ent : Node_Or_Entity_Id);
+ -- Generate a call to Error_Msg_NE with parameters Msg_D or
+ -- Msg_S (for dynamic or static elaboration model), N and Ent.
+
+ ------------------
+ -- Elab_Warning --
+ ------------------
+
+ procedure Elab_Warning
+ (Msg_D : String;
+ Msg_S : String;
+ Ent : Node_Or_Entity_Id)
+ is
+ begin
+ if Dynamic_Elaboration_Checks then
+ Error_Msg_NE (Msg_D, N, Ent);
+ else
+ Error_Msg_NE (Msg_S, N, Ent);
+ end if;
+ end Elab_Warning;
- else
- if Is_Init_Proc (Entity (Name (N)))
- and then Comes_From_Source (Ent)
- then
- Error_Msg_NE
- ("implicit call to & may raise Program_Error?", N, Ent);
+ -- Start of processing for Generate_Elab_Warnings
+
+ begin
+ if Inst_Case then
+ Elab_Warning
+ ("instantiation of& may raise Program_Error?",
+ "info: instantiation of& during elaboration?", Ent);
else
- Error_Msg_NE
- ("call to & may raise Program_Error?", N, Ent);
+ if Nkind (Name (N)) in N_Has_Entity
+ and then Is_Init_Proc (Entity (Name (N)))
+ and then Comes_From_Source (Ent)
+ then
+ Elab_Warning
+ ("implicit call to & may raise Program_Error?",
+ "info: implicit call to & during elaboration?",
+ Ent);
+
+ else
+ Elab_Warning
+ ("call to & may raise Program_Error?",
+ "info: call to & during elaboration?",
+ Ent);
+ end if;
end if;
- end if;
- Error_Msg_Qual_Level := Nat'Last;
+ Error_Msg_Qual_Level := Nat'Last;
- if Nkind (N) in N_Subprogram_Instantiation then
- Error_Msg_NE
- ("\missing pragma Elaborate for&?", N, W_Scope);
- else
- Error_Msg_NE
- ("\missing pragma Elaborate_All for&?", N, W_Scope);
- end if;
+ if Nkind (N) in N_Subprogram_Instantiation then
+ Elab_Warning
+ ("\missing pragma Elaborate for&?",
+ "\info: implicit pragma Elaborate for& generated?",
+ W_Scope);
+ else
+ Elab_Warning
+ ("\missing pragma Elaborate_All for&?",
+ "\info: implicit pragma Elaborate_All for & generated?",
+ W_Scope);
+ end if;
+ end Generate_Elab_Warnings;
Error_Msg_Qual_Level := 0;
Output_Calls (N);
- -- Set flag to prevent further warnings for same unit
- -- unless in All_Errors_Mode.
+ -- 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 (W_Scope, True);
-- Runtime elaboration check required. Generate check of the
-- elaboration Boolean for the unit containing the entity.
- -- Note that for this case, we do check the real unit (the
- -- one from following renamings, since that is the issue!)
+ -- Note that for this case, we do check the real unit (the one
+ -- from following renamings, since that is the issue!)
-- Could this possibly miss a useless but required PE???
Insert_Elab_Check (N,
Make_Attribute_Reference (Loc,
Attribute_Name => Name_Elaborated,
- Prefix =>
- New_Occurrence_Of
- (Spec_Entity (E_Scope), Loc)));
+ Prefix => New_Occurrence_Of (Spec_Entity (E_Scope), Loc)));
+
+ -- Prevent duplicate elaboration checks on the same call,
+ -- which can happen if the body enclosing the call appears
+ -- itself in a call whose elaboration check is delayed.
+
+ if Nkind_In (N, N_Function_Call,
+ N_Procedure_Call_Statement)
+ then
+ Set_No_Elaboration_Check (N);
+ end if;
end if;
-- Case of static elaboration model
else
- -- Do not do anything if elaboration checks suppressed. Note
- -- that we check Ent here, not E, since we want the real entity
- -- for the body to see if checks are suppressed for it, not the
- -- dummy entry for renamings or derivations.
+ -- Do not do anything if elaboration checks suppressed. Note that
+ -- we check Ent here, not E, since we want the real entity for the
+ -- body to see if checks are suppressed for it, not the dummy
+ -- entry for renamings or derivations.
if Elaboration_Checks_Suppressed (Ent)
or else Elaboration_Checks_Suppressed (E_Scope)
then
null;
+ -- Do not generate an Elaborate_All for finalization routines
+ -- which perform partial clean up as part of initialization.
+
+ elsif In_Init_Proc
+ and then Is_Finalization_Procedure (Ent)
+ then
+ null;
+
-- Here we need to generate an implicit elaborate all
else
---------------------
procedure Check_Elab_Call
- (N : Node_Id;
- Outer_Scope : Entity_Id := Empty)
+ (N : Node_Id;
+ Outer_Scope : Entity_Id := Empty;
+ In_Init_Proc : Boolean := False)
is
Ent : Entity_Id;
P : Node_Id;
function Get_Called_Ent return Entity_Id;
-- Retrieve called entity. If this is a call to a protected subprogram,
-- entity is a selected component. The callable entity may be absent,
- -- in which case there is no check to perform. This happens with
+ -- in which case there is no check to perform. This happens with
-- non-analyzed calls in nested generics.
--------------------
-- 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).
- -- However, we have to check calls within component definitions (e.g., a
- -- function call that determines an array component bound), so we
+ -- However, we have to check calls within component definitions (e.g.
+ -- a function call that determines an array component bound), so we
-- terminate the loop in that case.
P := Parent (N);
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).
+ -- 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;
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)
+ -- 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
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 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);
+ Check_A_Call
+ (N => N,
+ E => Ent,
+ Outer_Scope => Outer_Scope,
+ Inter_Unit_Only => False,
+ In_Init_Proc => In_Init_Proc);
elsif Elaboration_Checks_Suppressed (Current_Scope) then
null;
(N,
Ent,
Standard_Standard,
- Inter_Unit_Only => True,
+ Inter_Unit_Only => True,
Generate_Warnings => False);
-- Otherwise nothing to do
-- A call to an Init_Proc in elaboration code may bring additional
-- dependencies, if some of the record components thereof have
- -- initializations that are function calls that come from source.
- -- We treat the current node as a call to each of these functions,
- -- to check their elaboration impact.
+ -- initializations that are function calls that come from source. We
+ -- treat the current node as a call to each of these functions, to check
+ -- their elaboration impact.
if Is_Init_Proc (Ent)
and then From_Elab_Code
Process_Init_Proc : declare
Unit_Decl : constant Node_Id := Unit_Declaration_Node (Ent);
- function Find_Init_Call (Nod : Node_Id) return Traverse_Result;
+ function Check_Init_Call (Nod : Node_Id) return Traverse_Result;
-- Find subprogram calls within body of Init_Proc for Traverse
-- instantiation below.
- procedure Traverse_Body is new Traverse_Proc (Find_Init_Call);
+ procedure Traverse_Body is new Traverse_Proc (Check_Init_Call);
-- Traversal procedure to find all calls with body of Init_Proc
- --------------------
- -- Find_Init_Call --
- --------------------
+ ---------------------
+ -- Check_Init_Call --
+ ---------------------
- function Find_Init_Call (Nod : Node_Id) return Traverse_Result is
+ function Check_Init_Call (Nod : Node_Id) return Traverse_Result is
Func : Entity_Id;
begin
else
return OK;
end if;
- end Find_Init_Call;
+ end Check_Init_Call;
-- Start of processing for Process_Init_Proc
Pkg_Body : Entity_Id;
begin
- -- For record or array component, check prefix. If it is an access
- -- type, then there is nothing to do (we do not know what is being
- -- assigned), but otherwise this is an assignment to the prefix.
+ -- For record or array component, check prefix. If it is an access type,
+ -- then there is nothing to do (we do not know what is being assigned),
+ -- but otherwise this is an assignment to the prefix.
if Nkind (N) = N_Indexed_Component
or else
return;
end if;
- -- All OK if warnings suppressed on the entity
-
- if Warnings_Off (Ent) then
- return;
- end if;
-
-- All OK if all warnings suppressed
if Warning_Mode = Suppress then
-- Here is where we give the warning
- Error_Msg_Sloc := Sloc (Ent);
+ -- All OK if warnings suppressed on the entity
- Error_Msg_NE
- ("?elaboration code may access& before it is initialized",
- N, Ent);
- Error_Msg_NE
- ("\?suggest adding pragma Elaborate_Body to spec of &",
- N, Scop);
- Error_Msg_N
- ("\?or an explicit initialization could be added #", N);
+ if not Has_Warnings_Off (Ent) then
+ Error_Msg_Sloc := Sloc (Ent);
+
+ Error_Msg_NE
+ ("?elaboration code may access& before it is initialized",
+ N, Ent);
+ Error_Msg_NE
+ ("\?suggest adding pragma Elaborate_Body to spec of &",
+ N, Scop);
+ Error_Msg_N
+ ("\?or an explicit initialization could be added #", N);
+ end if;
if not All_Errors_Mode then
Set_Suppress_Elaboration_Warnings (Ent);
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 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 Is_Generic_Unit (Cunit_Entity (Main_Unit))
Expander_Mode_Save_And_Set (True);
for J in Delay_Check.First .. Delay_Check.Last loop
- New_Scope (Delay_Check.Table (J).Curscop);
+ Push_Scope (Delay_Check.Table (J).Curscop);
From_Elab_Code := Delay_Check.Table (J).From_Elab_Code;
Check_Internal_Call_Continue (
-- outer level call.
-- It is an outer level instantiation from elaboration code, or the
- -- instantiated entity is in the same elaboratoin scope.
+ -- instantiated entity is in the same elaboration scope.
-- And in these cases, we will check both the inter-unit case and
-- the intra-unit (within a single unit) case.
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.
+ -- 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;
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.
+ -- Nothing to do if analyzing in special spec-expression mode, since the
+ -- call is not actually being made at this time.
- elsif In_Default_Expression then
+ elsif In_Spec_Expression then
return;
-- Nothing to do for call to intrinsic subprogram
elsif In_Task_Activation then
return;
+
+ -- Nothing to do if call is within a generic unit
+
+ elsif Inside_A_Generic 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) :=
+ Delay_Check.Append (
(N => N,
E => E,
Orig_Ent => Orig_Ent,
Curscop => Current_Scope,
Outer_Scope => Outer_Scope,
- From_Elab_Code => From_Elab_Code);
+ From_Elab_Code => From_Elab_Code));
return;
-- Otherwise, call phase 2 continuation right now
-- arguments that are assignments (OUT or IN OUT mode formals).
elsif Nkind (N) = N_Procedure_Call_Statement then
- Check_Elab_Call (N, Outer_Scope);
+ Check_Elab_Call (N, Outer_Scope, In_Init_Proc => Is_Init_Proc (E));
Actual := First_Actual (N);
while Present (Actual) loop
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.
+ -- 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!
+ -- 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)
Outer_Level_Sloc := Loc;
end if;
- Elab_Visited.Increment_Last;
- Elab_Visited.Table (Elab_Visited.Last) := E;
+ Elab_Visited.Append (E);
-- If the call is to a function that renames a literal, no check
-- is needed.
end if;
end if;
- -- If the body appears after the outer level call or
- -- instantiation then we have an error case handled below.
+ -- 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
elsif Inst_Case then
return;
- -- Otherwise we have a call, so we trace through the called
- -- body to see if it has any problems ..
+ -- 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;
+ Elab_Call.Append ((Cloc => Loc, Ent => E));
if Debug_Flag_LL then
Write_Str ("Elab_Call.Last = ");
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.
+ -- 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;
return;
end if;
- -- Here is the case of calling a subprogram where the body has
- -- not yet been encountered, a warning message is needed.
+ -- Here is the case of calling a subprogram where the body has not yet
+ -- been encountered. A warning message is needed, except if this is the
+ -- case of appearing within an aspect specification that results in
+ -- a check call, we do not really have such a situation, so no warning
+ -- is needed (e.g. the case of a precondition, where the call appears
+ -- textually before the body, but in actual fact is moved to the
+ -- appropriate subprogram body and so does not need a check).
- -- If we have nothing in the call stack, then this is at the
- -- outer level, and the ABE is bound to occur.
+ declare
+ P : Node_Id;
+ begin
+ P := Parent (N);
+ loop
+ if Nkind (P) in N_Subexpr then
+ P := Parent (P);
+ elsif Nkind (P) = N_If_Statement
+ and then Nkind (Original_Node (P)) = N_Pragma
+ and then Present (Corresponding_Aspect (Original_Node (P)))
+ then
+ return;
+ else
+ exit;
+ end if;
+ end loop;
+ end;
+
+ -- Not that special case, warning and dynamic check is required
+
+ -- 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
begin
Set_Elaboration_Entity (E, Ent);
- New_Scope (Scope (E));
+ Push_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)));
+ Object_Definition =>
+ New_Occurrence_Of (Standard_Short_Integer, Loce),
+ Expression =>
+ Make_Integer_Literal (Loc, Uint_0)));
-- Set elaboration flag at the point of the body
end;
end if;
- -- Generate check of the elaboration Boolean
+ -- Generate check of the elaboration counter
Insert_Elab_Check (N,
- New_Occurrence_Of (Elaboration_Entity (E), Loc));
+ Make_Attribute_Reference (Loc,
+ Attribute_Name => Name_Elaborated,
+ Prefix => New_Occurrence_Of (E, Loc)));
end if;
-- Generate the warning
("task will be activated before elaboration of its body?",
Decl);
Error_Msg_N
- ("\Program_Error will be raised at run-time?", Decl);
+ ("\Program_Error will be raised at run time?", Decl);
elsif
Present (Corresponding_Body (Unit_Declaration_Node (Proc)))
and then
not Restriction_Active (No_Entry_Calls_In_Elaboration_Code)
then
- -- Runtime elaboration check required. generate check of the
- -- elaboration Boolean for the unit containing the entity.
+ -- Runtime elaboration check required. Generate check of the
+ -- elaboration counter 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)));
+ New_Occurrence_Of (Spec_Entity (Task_Scope), Loc)));
end if;
else
and then not Elaboration_Checks_Suppressed (Task_Scope)
then
Error_Msg_Node_2 := Task_Scope;
- Error_Msg_NE ("activation of an instance of task type&" &
+ Error_Msg_NE
+ ("activation of an instance of task type&" &
" requires pragma Elaborate_All on &?", N, Ent);
end if;
and then Present (Parameter_Associations (Call))
and then Is_Controlled (Etype (First_Actual (Call)));
begin
- -- If the unit is mentioned in a with_clause of the current
- -- unit, it is visible, and we can set the elaboration flag.
+ -- If the unit is mentioned in a with_clause of the current unit, it is
+ -- visible, and we can set the elaboration flag.
if Is_Immediately_Visible (Scop)
or else (Is_Child_Unit (Scop) and then Is_Visible_Child_Unit (Scop))
return;
end if;
- -- If the unit is not in the context, there must be an intermediate
- -- unit that is, on which we need to place to elaboration flag. This
- -- happens with init proc calls.
+ -- If the unit is not in the context, there must be an intermediate unit
+ -- that is, on which we need to place to elaboration flag. This happens
+ -- with init proc calls.
if Is_Init_Proc (Subp)
or else Init_Call
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.
+ -- 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.
+ -- 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.
+ -- 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 --
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 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.
+ -- 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
Typ : constant Entity_Id := Etype (N);
Chk : constant Boolean := Do_Range_Check (N);
- R : constant Node_Id :=
- Make_Raise_Program_Error (Loc,
+ R : constant Node_Id :=
+ Make_Raise_Program_Error (Loc,
Reason => PE_Access_Before_Elaboration);
+ Reloc_N : Node_Id;
+
begin
Set_Etype (R, Typ);
Rewrite (N, R);
else
+ Reloc_N := Relocate_Node (N);
+ Save_Interps (N, Reloc_N);
Rewrite (N,
Make_Conditional_Expression (Loc,
- Expressions => New_List (C, Relocate_Node (N), R)));
+ Expressions => New_List (C, Reloc_N, R)));
end if;
Analyze_And_Resolve (N, Typ);
end if;
end Insert_Elab_Check;
+ -------------------------------
+ -- Is_Finalization_Procedure --
+ -------------------------------
+
+ function Is_Finalization_Procedure (Id : Entity_Id) return Boolean is
+ begin
+ -- Check whether Id is a procedure with at least one parameter
+
+ if Ekind (Id) = E_Procedure
+ and then Present (First_Formal (Id))
+ then
+ declare
+ Typ : constant Entity_Id := Etype (First_Formal (Id));
+ Deep_Fin : Entity_Id := Empty;
+ Fin : Entity_Id := Empty;
+
+ begin
+ -- If the type of the first formal does not require finalization
+ -- actions, then this is definitely not [Deep_]Finalize.
+
+ if not Needs_Finalization (Typ) then
+ return False;
+ end if;
+
+ -- At this point we have the following scenario:
+
+ -- procedure Name (Param1 : [in] [out] Ctrl[; Param2 : ...]);
+
+ -- Recover the two possible versions of [Deep_]Finalize using the
+ -- type of the first parameter and compare with the input.
+
+ Deep_Fin := TSS (Typ, TSS_Deep_Finalize);
+
+ if Is_Controlled (Typ) then
+ Fin := Find_Prim_Op (Typ, Name_Finalize);
+ end if;
+
+ return
+ (Present (Deep_Fin) and then Id = Deep_Fin)
+ or else
+ (Present (Fin) and then Id = Fin);
+ end;
+ end if;
+
+ return False;
+ end Is_Finalization_Procedure;
+
------------------
-- Output_Calls --
------------------
-- 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
+ if Ekind_In (E, E_Void, E_Subprogram_Body, E_Package_Body) then
Decl := E;
loop
declare
Ent : constant Entity_Id := Defining_Unit_Name (Specification (N));
begin
- Set_Is_Imported (Ent);
- Set_Convention (Ent, Convention_Stubbed);
+
+ -- Internal subprograms will already have a generated body, so
+ -- there is no need to provide a stub for them.
+
+ if No (Corresponding_Body (N)) then
+ declare
+ Loc : constant Source_Ptr := Sloc (N);
+ B : Node_Id;
+ Formals : constant List_Id := Copy_Parameter_List (Ent);
+ Nam : constant Entity_Id :=
+ Make_Defining_Identifier (Loc, Chars (Ent));
+ Spec : Node_Id;
+ Stats : constant List_Id :=
+ New_List
+ (Make_Raise_Program_Error (Loc,
+ Reason => PE_Access_Before_Elaboration));
+
+ begin
+ if Ekind (Ent) = E_Function then
+ Spec :=
+ Make_Function_Specification (Loc,
+ Defining_Unit_Name => Nam,
+ Parameter_Specifications => Formals,
+ Result_Definition =>
+ New_Copy_Tree
+ (Result_Definition (Specification (N))));
+
+ -- We cannot reliably make a return statement for this
+ -- body, but none is needed because the call raises
+ -- program error.
+
+ Set_Return_Present (Ent);
+
+ else
+ Spec :=
+ Make_Procedure_Specification (Loc,
+ Defining_Unit_Name => Nam,
+ Parameter_Specifications => Formals);
+ end if;
+
+ B := Make_Subprogram_Body (Loc,
+ Specification => Spec,
+ Declarations => New_List,
+ Handled_Statement_Sequence =>
+ Make_Handled_Sequence_Of_Statements (Loc, Stats));
+ Insert_After (N, B);
+ Analyze (B);
+ end;
+ end if;
end;
elsif Nkind (N) = N_Package_Declaration then
declare
Spec : constant Node_Id := Specification (N);
begin
- New_Scope (Defining_Unit_Name (Spec));
+ Push_Scope (Defining_Unit_Name (Spec));
Supply_Bodies (Visible_Declarations (Spec));
Supply_Bodies (Private_Declarations (Spec));
Pop_Scope;
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;
--------------------------
Item := First (Context_Items (Cunit (Current_Sem_Unit)));
while Present (Item) loop
if Nkind (Item) = N_Pragma
- and then Get_Pragma_Id (Chars (Item)) = Pragma_Elaborate_All
+ and then Pragma_Name (Item) = Name_Elaborate_All
then
-- Return if some previous error on the pragma itself
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