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2014-10-30  Yannick Moy  <moy@adacore.com>

	* inline.adb (Has_Single_Return_In_GNATprove_Mode):
	Return False when return statement is inside one or more blocks.

2014-10-30  Hristian Kirtchev  <kirtchev@adacore.com>

	* exp_ch7.adb (Is_Subprogram_Call): Account for the case where an
	object declaration initialized by a function call that returns
	an unconstrained result may be rewritted as a renaming of the
	secondary stack result.

2014-10-30  Hristian Kirtchev  <kirtchev@adacore.com>

	* aspects.adb: Add an entry for aspect Extensions_Visible in
	table Canonical_Aspect.
	* aspects.ads: Add entry for aspect Extensions_Visible in
	tables Aspect_Argument, Aspect_Delay, Aspect_Id, Aspect_Names,
	Implementation_Defined_Aspect.
	* einfo.adb (Get_Pragma): Include pragma Extensions_Visible in
	the list of contract pragmas.
	* par-prag.adb Pragma Extensions_Visible does not require special
	processing from the parser.
	* sem_ch3.adb (Analyze_Object_Declaration): Prevent an
	implicit class-wide conversion of a formal parameter
	of a specific tagged type whose related subprogram is
	subject to pragma Extensions_Visible with value "False".
	(Check_Abstract_Overriding): Add various overriding checks
	related to pragma Extensions_Visible.
	(Derive_Subprogram):
	A subprogram subject to pragma Extensions_Visible with value
	False requires overriding if the subprogram has at least one
	controlling OUT parameter.
	(Is_EVF_Procedure): New routine.
	* sem_ch4.adb (Analyze_Type_Conversion): A formal parameter of
	a specific tagged type whose related subprogram is subject to
	pragma Extensions_Visible with value "False" cannot appear in
	a class-wide conversion.
	* sem_ch6.adb (Analyze_Subprogram_Contract): Remove
	the assertion to account for pragma Extensions_Visible.
	(Check_Overriding_Indicator): An overriding subprogram
	inherits the contact of the overridden subprogram.
	(New_Overloaded_Entity): An overriding subprogram inherits the
	contact of the overridden subprogram.
	* sem_ch13.adb (Analyze_Aspect_Specifications): Add processing
	for aspect Extensions_Visible.
	(Check_Aspect_At_Freeze_Point): Aspect Extensions_Visible does not
	require special processing at the freeze point.
	* sem_prag.adb Add an entry for pragma Extensions_Visible in
	table Sig_Flags.
	(Analyze_Pragma): Ensure that various SPARK
	pragmas lack identifiers in their arguments. Add processing for
	pragma Extensions_Visible.
	(Chain_CTC): Code reformatting.
	* sem_res.adb (Resolve_Actuals): A formal parameter of a
	specific tagged type whose related subprogram is subject to
	pragma Extensions_Visible with value "False" cannot act as an
	actual in a subprogram with value "True".
	* sem_util.adb (Add_Classification): New routine.
	(Add_Contract_Item): Account for pragma Extensions_Visible. Code
	reformatting.
	(Add_Contract_Test_Case): New routine.
	(Add_Pre_Post_Condition): New routine.
	(Extensions_Visible_Status): New routine.
	(Inherit_Subprogram_Contract): New routine.
	(Is_EVF_Expression): New routine.
	(Is_Specific_Tagged_Type): New routine.
	* sem_util.ads Add type Extensions_Visible_Mode and document all values.
	(Add_Contract_Item): Add pragma Extensions_Visible to the
	comment on usage.
	(Inherit_Subprogram_Contract): New routine.
	(Is_EVF_Expression): New routine.
	(Is_Specific_Tagged_Type): New routine.
	* sinfo.adb (Is_Inherited): New routine.
	(Set_Is_Inherited): New routine.
	* sinfo.ads Add flag Is_Inherited along with its usage in
	nodes.
	(Is_Inherited): New routine along with pragma Inline.
	(Set_Is_Inherited): New routine along with pragma Inline.
	* snames.ads-tmpl: Add predefined name "Extensions_Visible"
	and a new Pragma_Id for the pragma.

From-SVN: r216919
This commit is contained in:
Arnaud Charlet 2014-10-30 12:34:41 +01:00
parent 67848724e5
commit 039538bc35
18 changed files with 869 additions and 136 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

132
gcc/ada/ChangeLog
View File

@ -1,3 +1,135 @@
2014-10-30 Yannick Moy <moy@adacore.com>
* inline.adb (Has_Single_Return_In_GNATprove_Mode):
Return False when return statement is inside one or more blocks.
2014-10-30 Hristian Kirtchev <kirtchev@adacore.com>
* exp_ch7.adb (Is_Subprogram_Call): Account for the case where an
object declaration initialized by a function call that returns
an unconstrained result may be rewritted as a renaming of the
secondary stack result.
2014-10-30 Hristian Kirtchev <kirtchev@adacore.com>
* aspects.adb: Add an entry for aspect Extensions_Visible in
table Canonical_Aspect.
* aspects.ads: Add entry for aspect Extensions_Visible in
tables Aspect_Argument, Aspect_Delay, Aspect_Id, Aspect_Names,
Implementation_Defined_Aspect.
* einfo.adb (Get_Pragma): Include pragma Extensions_Visible in
the list of contract pragmas.
* par-prag.adb Pragma Extensions_Visible does not require special
processing from the parser.
* sem_ch3.adb (Analyze_Object_Declaration): Prevent an
implicit class-wide conversion of a formal parameter
of a specific tagged type whose related subprogram is
subject to pragma Extensions_Visible with value "False".
(Check_Abstract_Overriding): Add various overriding checks
related to pragma Extensions_Visible.
(Derive_Subprogram):
A subprogram subject to pragma Extensions_Visible with value
False requires overriding if the subprogram has at least one
controlling OUT parameter.
(Is_EVF_Procedure): New routine.
* sem_ch4.adb (Analyze_Type_Conversion): A formal parameter of
a specific tagged type whose related subprogram is subject to
pragma Extensions_Visible with value "False" cannot appear in
a class-wide conversion.
* sem_ch6.adb (Analyze_Subprogram_Contract): Remove
the assertion to account for pragma Extensions_Visible.
(Check_Overriding_Indicator): An overriding subprogram
inherits the contact of the overridden subprogram.
(New_Overloaded_Entity): An overriding subprogram inherits the
contact of the overridden subprogram.
* sem_ch13.adb (Analyze_Aspect_Specifications): Add processing
for aspect Extensions_Visible.
(Check_Aspect_At_Freeze_Point): Aspect Extensions_Visible does not
require special processing at the freeze point.
* sem_prag.adb Add an entry for pragma Extensions_Visible in
table Sig_Flags.
(Analyze_Pragma): Ensure that various SPARK
pragmas lack identifiers in their arguments. Add processing for
pragma Extensions_Visible.
(Chain_CTC): Code reformatting.
* sem_res.adb (Resolve_Actuals): A formal parameter of a
specific tagged type whose related subprogram is subject to
pragma Extensions_Visible with value "False" cannot act as an
actual in a subprogram with value "True".
* sem_util.adb (Add_Classification): New routine.
(Add_Contract_Item): Account for pragma Extensions_Visible. Code
reformatting.
(Add_Contract_Test_Case): New routine.
(Add_Pre_Post_Condition): New routine.
(Extensions_Visible_Status): New routine.
(Inherit_Subprogram_Contract): New routine.
(Is_EVF_Expression): New routine.
(Is_Specific_Tagged_Type): New routine.
* sem_util.ads Add type Extensions_Visible_Mode and document all values.
(Add_Contract_Item): Add pragma Extensions_Visible to the
comment on usage.
(Inherit_Subprogram_Contract): New routine.
(Is_EVF_Expression): New routine.
(Is_Specific_Tagged_Type): New routine.
* sinfo.adb (Is_Inherited): New routine.
(Set_Is_Inherited): New routine.
* sinfo.ads Add flag Is_Inherited along with its usage in
nodes.
(Is_Inherited): New routine along with pragma Inline.
(Set_Is_Inherited): New routine along with pragma Inline.
* snames.ads-tmpl: Add predefined name "Extensions_Visible"
and a new Pragma_Id for the pragma.
2014-10-30 Vincent Celier <celier@adacore.com>
* prj-proc.adb (Process_Case_Construction): Do not look for
the ultimate extending project for a case variable.
2014-10-30 Pierre-Marie Derodat <derodat@adacore.com>
* exp_dbug.adb, opt.ads (GNAT_Encodings): Import from C. Define
enumerators.
(gnat_encodings): Define a dummy variable for the AAMP back-end.
(Get_Encoded_Name): When -fgnat-encodings=all|gdb, encode names
for all discrete types whose bounds do not match size and do so
only for biased types when -fgnat-encodings=minimal.
* gcc-interface/decl.c (gnat_to_gnu_entity): Do not create ___XA
parallel types when array bounds are constant while the lower bound is
not 1. Also stop generating them because the bound type is
larger than sizetype.
* gcc-interface/misc.c (gnat_encodings): New.
2014-10-30 Thomas Quinot <quinot@adacore.com>
* opt.adb (Set_Opt_Config_Switches): For an internal unit,
always reset Default_SSO to ' '.
2014-10-30 Thomas Quinot <quinot@adacore.com>
* freeze.adb (Freeze_Record_Type): Set SSO from default before
checking SSO consistency.
2014-10-30 Javier Miranda <miranda@adacore.com>
* inline.adb (Check_Package_Body_For_Inlining):
Cleanup this subprogram to implement exactly the behavior
documented in the spec.
2014-10-30 Hristian Kirtchev <kirtchev@adacore.com>
* a-comutr.adb, a-cimutr.adb (Insert_Child): Add new variable First.
Update the position after all insertions have taken place.
2014-10-30 Ed Schonberg <schonberg@adacore.com>
* sem_prag.adb (Analyze_Pragma, case License): Do not perform
analysis of pragma arguments when in CodePeer mode, pragma has
different format on other compilers.
2014-10-30 Thomas Quinot <quinot@adacore.com>
* s-os_lib.adb: Minor reformatting.
2014-10-29 Richard Sandiford <richard.sandiford@arm.com>
* gcc-interface/decl.c, gcc-interface/gigi.h, gcc-interface/misc.c,

1
gcc/ada/aspects.adb
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@ -522,6 +522,7 @@ package body Aspects is
Aspect_Effective_Writes => Aspect_Effective_Writes,
Aspect_Elaborate_Body => Aspect_Elaborate_Body,
Aspect_Export => Aspect_Export,
Aspect_Extensions_Visible => Aspect_Extensions_Visible,
Aspect_External_Name => Aspect_External_Name,
Aspect_External_Tag => Aspect_External_Tag,
Aspect_Favor_Top_Level => Aspect_Favor_Top_Level,

9
gcc/ada/aspects.ads
View File

@ -94,6 +94,7 @@ package Aspects is
Aspect_Dimension_System, -- GNAT
Aspect_Dispatching_Domain,
Aspect_Dynamic_Predicate,
Aspect_Extensions_Visible, -- GNAT
Aspect_External_Name,
Aspect_External_Tag,
Aspect_Global, -- GNAT
@ -230,6 +231,7 @@ package Aspects is
Aspect_Dimension_System => True,
Aspect_Effective_Reads => True,
Aspect_Effective_Writes => True,
Aspect_Extensions_Visible => True,
Aspect_Favor_Top_Level => True,
Aspect_Global => True,
Aspect_Inline_Always => True,
@ -318,6 +320,7 @@ package Aspects is
Aspect_Dimension_System => Expression,
Aspect_Dispatching_Domain => Expression,
Aspect_Dynamic_Predicate => Expression,
Aspect_Extensions_Visible => Optional_Expression,
Aspect_External_Name => Expression,
Aspect_External_Tag => Expression,
Aspect_Global => Expression,
@ -408,9 +411,10 @@ package Aspects is
Aspect_Effective_Reads => Name_Effective_Reads,
Aspect_Effective_Writes => Name_Effective_Writes,
Aspect_Elaborate_Body => Name_Elaborate_Body,
Aspect_Export => Name_Export,
Aspect_Extensions_Visible => Name_Extensions_Visible,
Aspect_External_Name => Name_External_Name,
Aspect_External_Tag => Name_External_Tag,
Aspect_Export => Name_Export,
Aspect_Favor_Top_Level => Name_Favor_Top_Level,
Aspect_Global => Name_Global,
Aspect_Implicit_Dereference => Name_Implicit_Dereference,
@ -618,9 +622,9 @@ package Aspects is
Aspect_Dispatching_Domain => Always_Delay,
Aspect_Dynamic_Predicate => Always_Delay,
Aspect_Elaborate_Body => Always_Delay,
Aspect_Export => Always_Delay,
Aspect_External_Name => Always_Delay,
Aspect_External_Tag => Always_Delay,
Aspect_Export => Always_Delay,
Aspect_Favor_Top_Level => Always_Delay,
Aspect_Implicit_Dereference => Always_Delay,
Aspect_Import => Always_Delay,
@ -689,6 +693,7 @@ package Aspects is
Aspect_Dimension_System => Never_Delay,
Aspect_Effective_Reads => Never_Delay,
Aspect_Effective_Writes => Never_Delay,
Aspect_Extensions_Visible => Never_Delay,
Aspect_Global => Never_Delay,
Aspect_Initial_Condition => Never_Delay,
Aspect_Initializes => Never_Delay,

35
gcc/ada/einfo.adb
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@ -6684,31 +6684,32 @@ package body Einfo is
function Get_Pragma (E : Entity_Id; Id : Pragma_Id) return Node_Id is
Is_CDG : constant Boolean :=
Id = Pragma_Abstract_State or else
Id = Pragma_Async_Readers or else
Id = Pragma_Async_Writers or else
Id = Pragma_Depends or else
Id = Pragma_Effective_Reads or else
Id = Pragma_Effective_Writes or else
Id = Pragma_Global or else
Id = Pragma_Initial_Condition or else
Id = Pragma_Initializes or else
Id = Pragma_Part_Of or else
Id = Pragma_Refined_Depends or else
Id = Pragma_Refined_Global or else
Id = Pragma_Abstract_State or else
Id = Pragma_Async_Readers or else
Id = Pragma_Async_Writers or else
Id = Pragma_Depends or else
Id = Pragma_Effective_Reads or else
Id = Pragma_Effective_Writes or else
Id = Pragma_Extensions_Visible or else
Id = Pragma_Global or else
Id = Pragma_Initial_Condition or else
Id = Pragma_Initializes or else
Id = Pragma_Part_Of or else
Id = Pragma_Refined_Depends or else
Id = Pragma_Refined_Global or else
Id = Pragma_Refined_State;
Is_CTC : constant Boolean :=
Id = Pragma_Contract_Cases or else
Id = Pragma_Contract_Cases or else
Id = Pragma_Test_Case;
Is_PPC : constant Boolean :=
Id = Pragma_Precondition or else
Id = Pragma_Postcondition or else
Id = Pragma_Precondition or else
Id = Pragma_Postcondition or else
Id = Pragma_Refined_Post;
In_Contract : constant Boolean := Is_CDG or Is_CTC or Is_PPC;
Item : Node_Id;
Items : Node_Id;
Item : Node_Id;
Items : Node_Id;
begin
-- Handle pragmas that appear in N_Contract nodes. Those have to be

11
gcc/ada/exp_ch7.adb
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@ -4532,11 +4532,14 @@ package body Exp_Ch7 is
function Is_Subprogram_Call (N : Node_Id) return Traverse_Result is
begin
-- Complex constructs are factored out by the expander and their
-- occurrences are replaced with references to temporaries. Due to
-- this expansion activity, inspect the original tree to detect
-- subprogram calls.
-- occurrences are replaced with references to temporaries or
-- object renamings. Due to this expansion activity, inspect the
-- original tree to detect subprogram calls.
if Nkind (N) = N_Identifier and then Original_Node (N) /= N then
if Nkind_In (N, N_Identifier,
N_Object_Renaming_Declaration)
and then Original_Node (N) /= N
then
Detect_Subprogram_Call (Original_Node (N));
-- The original construct contains a subprogram call, there is

19
gcc/ada/inline.adb
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@ -933,7 +933,10 @@ package body Inline is
function Has_Single_Return_In_GNATprove_Mode return Boolean;
-- This function is called only in GNATprove mode, and it returns
-- True if the subprogram has no return statement or a single return
-- statement as last statement.
-- statement as last statement. It returns False for subprogram with
-- a single return as last statement inside one or more blocks, as
-- inlining would generate gotos in that case as well (although the
-- goto is useless in that case).
function Uses_Secondary_Stack (Bod : Node_Id) return Boolean;
-- If the body of the subprogram includes a call that returns an
@ -1003,15 +1006,10 @@ package body Inline is
-- Start of processing for Has_Single_Return_In_GNATprove_Mode
begin
-- Retrieve last statement inside possible block statements
-- Retrieve the last statement
Last_Statement := Last (Statements (Handled_Statement_Sequence (N)));
while Nkind (Last_Statement) = N_Block_Statement loop
Last_Statement :=
Last (Statements (Handled_Statement_Sequence (Last_Statement)));
end loop;
-- Check that the last statement is the only possible return
-- statement in the subprogram.
@ -2049,16 +2047,15 @@ package body Inline is
OK : Boolean;
begin
if Is_Compilation_Unit (P)
if Front_End_Inlining
and then Is_Compilation_Unit (P)
and then not Is_Generic_Instance (P)
then
Bname := Get_Body_Name (Get_Unit_Name (Unit (N)));
E := First_Entity (P);
while Present (E) loop
if Has_Pragma_Inline_Always (E)
or else (Front_End_Inlining and then Has_Pragma_Inline (E))
then
if Has_Pragma_Inline (E) then
if not Is_Loaded (Bname) then
Load_Needed_Body (N, OK);

1
gcc/ada/par-prag.adb
View File

@ -1220,6 +1220,7 @@ begin
Pragma_Export_Value |
Pragma_Export_Valued_Procedure |
Pragma_Extend_System |
Pragma_Extensions_Visible |
Pragma_External |
Pragma_External_Name_Casing |
Pragma_Favor_Top_Level |

16
gcc/ada/sem_ch13.adb
View File

@ -2256,6 +2256,21 @@ package body Sem_Ch13 is
Insert_Pragma (Aitem);
goto Continue;
-- Aspect Extensions_Visible is never delayed because it is
-- equivalent to a source pragma which appears after the
-- related subprogram.
when Aspect_Extensions_Visible =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Extensions_Visible);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Global
-- Aspect Global is never delayed because it is equivalent to
@ -8817,6 +8832,7 @@ package body Sem_Ch13 is
Aspect_Default_Initial_Condition |
Aspect_Dimension |
Aspect_Dimension_System |
Aspect_Extensions_Visible |
Aspect_Implicit_Dereference |
Aspect_Initial_Condition |
Aspect_Initializes |

93
gcc/ada/sem_ch3.adb
View File

@ -590,6 +590,12 @@ package body Sem_Ch3 is
-- Propagate static and dynamic predicate flags from a parent to the
-- subtype in a subtype declaration with and without constraints.
function Is_EVF_Procedure (Subp : Entity_Id) return Boolean;
-- Subsidiary to Check_Abstract_Overriding and Derive_Subprogram.
-- Determine whether subprogram Subp is a procedure subject to pragma
-- Extensions_Visible with value False and has at least one controlling
-- parameter of mode OUT.
function Is_Valid_Constraint_Kind
(T_Kind : Type_Kind;
Constraint_Kind : Node_Kind) return Boolean;
@ -3638,8 +3644,8 @@ package body Sem_Ch3 is
and then Is_Access_Constant (Etype (E))
then
Error_Msg_N
("access to variable cannot be initialized "
& "with an access-to-constant expression", E);
("access to variable cannot be initialized with an "
& "access-to-constant expression", E);
end if;
if not Assignment_OK (N) then
@ -3694,6 +3700,17 @@ package body Sem_Ch3 is
Check_SPARK_05_Restriction
("initialization expression is not appropriate", E);
end if;
-- A formal parameter of a specific tagged type whose related
-- subprogram is subject to pragma Extensions_Visible with value
-- "False" cannot be implicitly converted to a class-wide type by
-- means of an initialization expression.
if Is_Class_Wide_Type (T) and then Is_EVF_Expression (E) then
Error_Msg_N
("formal parameter with Extensions_Visible False cannot be "
& "implicitly converted to class-wide type", E);
end if;
end if;
-- If the No_Streams restriction is set, check that the type of the
@ -9790,6 +9807,15 @@ package body Sem_Ch3 is
then
null;
-- A null extension is not obliged to override an inherited
-- procedure subject to pragma Extensions_Visible with value
-- False and at least one controlling OUT parameter.
elsif Is_Null_Extension (T)
and then Is_EVF_Procedure (Subp)
then
null;
else
Error_Msg_NE
("type must be declared abstract or & overridden",
@ -9833,6 +9859,16 @@ package body Sem_Ch3 is
("\& subprogram# is not visible",
T, Subp);
-- Clarify the case where a non-null extension must
-- override inherited procedure subject to pragma
-- Extensions_Visible with value False and at least
-- one controlling OUT param.
elsif Is_EVF_Procedure (E) then
Error_Msg_NE
("\& # is subject to Extensions_Visible False",
T, Subp);
else
Error_Msg_NE
("\& has been inherited from subprogram #",
@ -9902,6 +9938,20 @@ package body Sem_Ch3 is
Error_Msg_Node_2 := Subp;
Error_Msg_N ("nonabstract type& has abstract subprogram&!", T);
end if;
-- A subprogram subject to pragma Extensions_Visible with value
-- "True" cannot override a subprogram subject to the same pragma
-- with value "False".
elsif Extensions_Visible_Status (Subp) = Extensions_Visible_True
and then Present (Overridden_Operation (Subp))
and then Extensions_Visible_Status (Overridden_Operation (Subp)) =
Extensions_Visible_False
then
Error_Msg_Sloc := Sloc (Overridden_Operation (Subp));
Error_Msg_N
("subprogram & with Extensions_Visible True cannot override "
& "subprogram # with Extensions_Visible False", Subp);
end if;
-- Ada 2012 (AI05-0030): Perform checks related to pragma Implemented
@ -14254,8 +14304,7 @@ package body Sem_Ch3 is
-- Start of processing for Derive_Subprogram
begin
New_Subp :=
New_Entity (Nkind (Parent_Subp), Sloc (Derived_Type));
New_Subp := New_Entity (Nkind (Parent_Subp), Sloc (Derived_Type));
Set_Ekind (New_Subp, Ekind (Parent_Subp));
Set_Contract (New_Subp, Make_Contract (Sloc (New_Subp)));
@ -14490,6 +14539,10 @@ package body Sem_Ch3 is
-- Ada 2005 (AI-228): Calculate the "require overriding" and "abstract"
-- properties of the subprogram, as defined in RM-3.9.3(4/2-6/2).
-- A subprogram subject to pragma Extensions_Visible with value False
-- requires overriding if the subprogram has at least one controlling
-- OUT parameter.
elsif Ada_Version >= Ada_2005
and then (Is_Abstract_Subprogram (Alias (New_Subp))
or else (Is_Tagged_Type (Derived_Type)
@ -14500,7 +14553,8 @@ package body Sem_Ch3 is
E_Anonymous_Access_Type
and then Designated_Type (Etype (New_Subp)) =
Derived_Type
and then not Is_Null_Extension (Derived_Type)))
and then not Is_Null_Extension (Derived_Type))
or else Is_EVF_Procedure (Alias (New_Subp)))
and then No (Actual_Subp)
then
if not Is_Tagged_Type (Derived_Type)
@ -17339,6 +17393,35 @@ package body Sem_Ch3 is
(Subt, Has_Dynamic_Predicate_Aspect (Par));
end Inherit_Predicate_Flags;
----------------------
-- Is_EVF_Procedure --
----------------------
function Is_EVF_Procedure (Subp : Entity_Id) return Boolean is
Formal : Entity_Id;
begin
-- Examine the formals of an Extensions_Visible False procedure looking
-- for a controlling OUT parameter.
if Ekind (Subp) = E_Procedure
and then Extensions_Visible_Status (Subp) = Extensions_Visible_False
then
Formal := First_Formal (Subp);
while Present (Formal) loop
if Ekind (Formal) = E_Out_Parameter
and then Is_Controlling_Formal (Formal)
then
return True;
end if;
Next_Formal (Formal);
end loop;
end if;
return False;
end Is_EVF_Procedure;
-----------------------
-- Is_Null_Extension --
-----------------------

38
gcc/ada/sem_ch4.adb
View File

@ -4944,14 +4944,13 @@ package body Sem_Ch4 is
procedure Analyze_Type_Conversion (N : Node_Id) is
Expr : constant Node_Id := Expression (N);
T : Entity_Id;
Typ : Entity_Id;
begin
-- If Conversion_OK is set, then the Etype is already set, and the
-- only processing required is to analyze the expression. This is
-- used to construct certain "illegal" conversions which are not
-- allowed by Ada semantics, but can be handled OK by Gigi, see
-- Sinfo for further details.
-- If Conversion_OK is set, then the Etype is already set, and the only
-- processing required is to analyze the expression. This is used to
-- construct certain "illegal" conversions which are not allowed by Ada
-- semantics, but can be handled by Gigi, see Sinfo for further details.
if Conversion_OK (N) then
Analyze (Expr);
@ -4962,9 +4961,9 @@ package body Sem_Ch4 is
-- checks to make sure the argument of the conversion is appropriate.
Find_Type (Subtype_Mark (N));
T := Entity (Subtype_Mark (N));
Set_Etype (N, T);
Check_Fully_Declared (T, N);
Typ := Entity (Subtype_Mark (N));
Set_Etype (N, Typ);
Check_Fully_Declared (Typ, N);
Analyze_Expression (Expr);
Validate_Remote_Type_Type_Conversion (N);
@ -5002,7 +5001,7 @@ package body Sem_Ch4 is
elsif Nkind (Expr) = N_Character_Literal then
if Ada_Version = Ada_83 then
Resolve (Expr, T);
Resolve (Expr, Typ);
else
Error_Msg_N ("argument of conversion cannot be character literal",
N);
@ -5010,14 +5009,23 @@ package body Sem_Ch4 is
end if;
elsif Nkind (Expr) = N_Attribute_Reference
and then
Nam_In (Attribute_Name (Expr), Name_Access,
Name_Unchecked_Access,
Name_Unrestricted_Access)
and then Nam_In (Attribute_Name (Expr), Name_Access,
Name_Unchecked_Access,
Name_Unrestricted_Access)
then
Error_Msg_N ("argument of conversion cannot be access", N);
Error_Msg_N ("\use qualified expression instead", N);
end if;
-- A formal parameter of a specific tagged type whose related subprogram
-- is subject to pragma Extensions_Visible with value "False" cannot
-- appear in a class-wide conversion.
if Is_Class_Wide_Type (Typ) and then Is_EVF_Expression (Expr) then
Error_Msg_N
("formal parameter with Extensions_Visible False cannot be "
& "converted to class-wide type", Expr);
end if;
end Analyze_Type_Conversion;
----------------------
@ -7603,7 +7611,7 @@ package body Sem_Ch4 is
if not Is_Aliased_View (Obj) then
Error_Msg_NE
("object in prefixed call to & must be aliased "
& " (RM-2005 4.3.1 (13))", Prefix (First_Actual), Subprog);
& "(RM-2005 4.3.1 (13))", Prefix (First_Actual), Subprog);
end if;
Analyze (First_Actual);

28
gcc/ada/sem_ch6.adb
View File

@ -4074,8 +4074,12 @@ package body Sem_Ch6 is
if Nam = Name_Depends then
Depends := Prag;
else pragma Assert (Nam = Name_Global);
elsif Nam = Name_Global then
Global := Prag;
-- Note that pragma Extensions_Visible has already been analyzed
end if;
Prag := Next_Pragma (Prag);
@ -5696,10 +5700,12 @@ package body Sem_Ch6 is
and then Present (Alias (Overridden_Subp))
and then Comes_From_Source (Alias (Overridden_Subp))
then
Set_Overridden_Operation (Subp, Alias (Overridden_Subp));
Set_Overridden_Operation (Subp, Alias (Overridden_Subp));
Inherit_Subprogram_Contract (Subp, Alias (Overridden_Subp));
else
Set_Overridden_Operation (Subp, Overridden_Subp);
Set_Overridden_Operation (Subp, Overridden_Subp);
Inherit_Subprogram_Contract (Subp, Overridden_Subp);
end if;
end if;
end if;
@ -9457,9 +9463,12 @@ package body Sem_Ch6 is
-- E overrides the operation from which S is inherited.
if Present (Alias (S)) then
Set_Overridden_Operation (E, Alias (S));
Set_Overridden_Operation (E, Alias (S));
Inherit_Subprogram_Contract (E, Alias (S));
else
Set_Overridden_Operation (E, S);
Set_Overridden_Operation (E, S);
Inherit_Subprogram_Contract (E, S);
end if;
if Comes_From_Source (E) then
@ -9625,7 +9634,8 @@ package body Sem_Ch6 is
and then Present (Alias (E))
and then Comes_From_Source (Alias (E))
then
Set_Overridden_Operation (S, Alias (E));
Set_Overridden_Operation (S, Alias (E));
Inherit_Subprogram_Contract (S, Alias (E));
-- Normal case of setting entity as overridden
@ -9637,7 +9647,8 @@ package body Sem_Ch6 is
-- must check whether the target is an init_proc.
elsif not Is_Init_Proc (S) then
Set_Overridden_Operation (S, E);
Set_Overridden_Operation (S, E);
Inherit_Subprogram_Contract (S, E);
end if;
Check_Overriding_Indicator (S, E, Is_Primitive => True);
@ -9660,7 +9671,8 @@ package body Sem_Ch6 is
Is_Predefined_Dispatching_Operation (Alias (E)))
then
if Present (Alias (E)) then
Set_Overridden_Operation (S, Alias (E));
Set_Overridden_Operation (S, Alias (E));
Inherit_Subprogram_Contract (S, Alias (E));
end if;
end if;

195
gcc/ada/sem_prag.adb
View File

@ -3842,9 +3842,9 @@ package body Sem_Prag is
-- pragma is inserted in its declarative part.
elsif From_Aspect_Specification (N)
and then Ent = Current_Scope
and then
Nkind (Unit_Declaration_Node (Ent)) = N_Subprogram_Body
and then Ent = Current_Scope
then
OK := True;
@ -5370,7 +5370,9 @@ package body Sem_Prag is
---------------
procedure Chain_CTC (PO : Node_Id) is
S : Entity_Id;
Name : constant String_Id := Get_Name_From_CTC_Pragma (N);
CTC : Node_Id;
S : Entity_Id;
begin
if Nkind (PO) = N_Abstract_Subprogram_Declaration then
@ -5399,31 +5401,23 @@ package body Sem_Prag is
-- There should not be another test-case with the same name
-- associated to this subprogram.
declare
Name : constant String_Id := Get_Name_From_CTC_Pragma (N);
CTC : Node_Id;
CTC := Contract_Test_Cases (Contract (S));
while Present (CTC) loop
begin
CTC := Contract_Test_Cases (Contract (S));
while Present (CTC) loop
-- Omit pragma Contract_Cases because it does not introduce
-- a unique case name and it does not follow the syntax of
-- Test_Case.
-- Omit pragma Contract_Cases because it does not introduce
-- a unique case name and it does not follow the syntax of
-- Test_Case.
if Pragma_Name (CTC) = Name_Contract_Cases then
null;
if Pragma_Name (CTC) = Name_Contract_Cases then
null;
elsif String_Equal (Name, Get_Name_From_CTC_Pragma (CTC)) then
Error_Msg_Sloc := Sloc (CTC);
Error_Pragma ("name for pragma% is already used#");
end if;
elsif String_Equal
(Name, Get_Name_From_CTC_Pragma (CTC))
then
Error_Msg_Sloc := Sloc (CTC);
Error_Pragma ("name for pragma% is already used#");
end if;
CTC := Next_Pragma (CTC);
end loop;
end;
CTC := Next_Pragma (CTC);
end loop;
-- Chain spec CTC pragma to list for subprogram
@ -10518,6 +10512,7 @@ package body Sem_Prag is
begin
GNAT_Pragma;
Check_No_Identifiers;
Check_Arg_Count (1);
Ensure_Aggregate_Form (Arg1);
@ -12292,6 +12287,7 @@ package body Sem_Prag is
begin
GNAT_Pragma;
Check_No_Identifiers;
Check_Arg_Count (1);
Ensure_Aggregate_Form (Arg1);
@ -12805,12 +12801,11 @@ package body Sem_Prag is
Expression => Get_Pragma_Arg (Arg1)))));
Analyze (N);
--------------------------------------
-- Pragma_Default_Initial_Condition --
--------------------------------------
-------------------------------
-- Default_Initial_Condition --
-------------------------------
-- pragma Pragma_Default_Initial_Condition
-- [ (null | boolean_EXPRESSION) ];
-- pragma Default_Initial_Condition [ (null | boolean_EXPRESSION) ];
when Pragma_Default_Initial_Condition => Default_Init_Cond : declare
Discard : Boolean;
@ -12819,6 +12814,7 @@ package body Sem_Prag is
begin
GNAT_Pragma;
Check_No_Identifiers;
Check_At_Most_N_Arguments (1);
Stmt := Prev (N);
@ -13883,6 +13879,135 @@ package body Sem_Prag is
Ada_Version_Pragma := Empty;
end if;
------------------------
-- Extensions_Visible --
------------------------
-- pragma Extensions_Visible [ (boolean_EXPRESSION) ];
when Pragma_Extensions_Visible => Extensions_Visible : declare
Context : constant Node_Id := Parent (N);
Expr : Node_Id;
Formal : Entity_Id;
Subp : Entity_Id;
Stmt : Node_Id;
Has_OK_Formal : Boolean := False;
begin
GNAT_Pragma;
Check_No_Identifiers;
Check_At_Most_N_Arguments (1);
Subp := Empty;
Stmt := Prev (N);
while Present (Stmt) loop
-- Skip prior pragmas, but check for duplicates
if Nkind (Stmt) = N_Pragma then
if Pragma_Name (Stmt) = Pname then
Error_Msg_Name_1 := Pname;
Error_Msg_Sloc := Sloc (Stmt);
Error_Msg_N ("pragma % duplicates pragma declared#", N);
end if;
-- Skip internally generated code
elsif not Comes_From_Source (Stmt) then
null;
-- The associated [generic] subprogram declaration has been
-- found, stop the search.
elsif Nkind_In (Stmt, N_Generic_Subprogram_Declaration,
N_Subprogram_Declaration)
then
Subp := Defining_Entity (Stmt);
exit;
-- The pragma does not apply to a legal construct, issue an
-- error and stop the analysis.
else
Error_Pragma ("pragma % must apply to a subprogram");
return;
end if;
Stmt := Prev (Stmt);
end loop;
-- When the pragma applies to a stand alone subprogram body, it
-- appears within the declarations of the body. In that case the
-- enclosing construct is the proper context. This check is done
-- after the traversal above to allow for duplicate detection.
if Nkind (Context) = N_Subprogram_Body
and then No (Corresponding_Spec (Context))
then
Subp := Defining_Entity (Context);
end if;
if No (Subp) then
Error_Pragma ("pragma % must apply to a subprogram");
return;
end if;
-- Examine the formals of the related subprogram
Formal := First_Formal (Subp);
while Present (Formal) loop
-- At least one of the formals is of a specific tagged type,
-- the pragma is legal.
if Is_Specific_Tagged_Type (Etype (Formal)) then
Has_OK_Formal := True;
exit;
-- A generic subprogram with at least one formal of a private
-- type ensures the legality of the pragma because the actual
-- may be specifically tagged. Note that this is verified by
-- the check above at instantiation time.
elsif Is_Private_Type (Etype (Formal))
and then Is_Generic_Type (Etype (Formal))
then
Has_OK_Formal := True;
exit;
end if;
Next_Formal (Formal);
end loop;
if not Has_OK_Formal then
Error_Msg_Name_1 := Pname;
Error_Msg_N (Fix_Error ("incorrect placement of pragma %"), N);
Error_Msg_NE
("\subprogram & lacks parameter of specific tagged or "
& "generic private type", N, Subp);
return;
end if;
-- Analyze the Boolean expression (if any)
if Present (Arg1) then
Expr := Get_Pragma_Arg (Arg1);
Analyze_And_Resolve (Expr, Standard_Boolean);
if not Is_OK_Static_Expression (Expr) then
Error_Pragma_Arg
("expression of pragma % must be static", Expr);
return;
end if;
end if;
-- Chain the pragma on the contract for further processing
Add_Contract_Item (N, Subp);
end Extensions_Visible;
--------------
-- External --
--------------
@ -14713,6 +14838,7 @@ package body Sem_Prag is
begin
GNAT_Pragma;
Check_No_Identifiers;
Check_Arg_Count (1);
-- Ensure the proper placement of the pragma. Initial_Condition
@ -14827,6 +14953,7 @@ package body Sem_Prag is
begin
GNAT_Pragma;
Check_No_Identifiers;
Check_Arg_Count (1);
Ensure_Aggregate_Form (Arg1);
@ -15760,6 +15887,15 @@ package body Sem_Prag is
when Pragma_License =>
GNAT_Pragma;
-- Do not analyze pragma any further in CodePeer mode, to avoid
-- extraneous errors in this implementation-dependent pragma,
-- which has a different profile on other compilers.
if CodePeer_Mode then
return;
end if;
Check_Arg_Count (1);
Check_No_Identifiers;
Check_Valid_Configuration_Pragma;
@ -17296,6 +17432,7 @@ package body Sem_Prag is
begin
GNAT_Pragma;
Check_No_Identifiers;
Check_Arg_Count (1);
-- Ensure the proper placement of the pragma. Part_Of must appear
@ -18675,6 +18812,7 @@ package body Sem_Prag is
begin
GNAT_Pragma;
Check_No_Identifiers;
Check_Arg_Count (1);
-- Ensure the proper placement of the pragma. Refined states must
@ -24918,6 +25056,7 @@ package body Sem_Prag is
Pragma_Export_Valued_Procedure => -1,
Pragma_Extend_System => -1,
Pragma_Extensions_Allowed => 0,
Pragma_Extensions_Visible => 0,
Pragma_External => -1,
Pragma_Favor_Top_Level => 0,
Pragma_External_Name_Casing => 0,

20
gcc/ada/sem_res.adb
View File

@ -3260,8 +3260,8 @@ package body Sem_Res is
if not Is_Aliased_View (Act) then
Error_Msg_NE
("object in prefixed call to& must be aliased"
& " (RM-2005 4.3.1 (13))",
("object in prefixed call to& must be aliased "
& "(RM-2005 4.3.1 (13))",
Prefix (Act), Nam);
end if;
@ -4418,6 +4418,22 @@ package body Sem_Res is
end if;
end if;
-- A formal parameter of a specific tagged type whose related
-- subprogram is subject to pragma Extensions_Visible with value
-- "False" cannot act as an actual in a subprogram with value
-- "True".
if Is_EVF_Expression (A)
and then Extensions_Visible_Status (Nam) =
Extensions_Visible_True
then
Error_Msg_N
("formal parameter with Extensions_Visible False cannot act "
& "as actual parameter", A);
Error_Msg_NE
("\subprogram & has Extensions_Visible True", A, Nam);
end if;
Next_Actual (A);
-- Case where actual is not present

330
gcc/ada/sem_util.adb
View File

@ -251,8 +251,52 @@ package body Sem_Util is
procedure Add_Contract_Item (Prag : Node_Id; Id : Entity_Id) is
Items : constant Node_Id := Contract (Id);
Nam : Name_Id;
N : Node_Id;
procedure Add_Classification;
-- Prepend Prag to the list of classifications
procedure Add_Contract_Test_Case;
-- Prepend Prag to the list of contract and test cases
procedure Add_Pre_Post_Condition;
-- Prepend Prag to the list of pre- and postconditions
------------------------
-- Add_Classification --
------------------------
procedure Add_Classification is
begin
Set_Next_Pragma (Prag, Classifications (Items));
Set_Classifications (Items, Prag);
end Add_Classification;
----------------------------
-- Add_Contract_Test_Case --
----------------------------
procedure Add_Contract_Test_Case is
begin
Set_Next_Pragma (Prag, Contract_Test_Cases (Items));
Set_Contract_Test_Cases (Items, Prag);
end Add_Contract_Test_Case;
----------------------------
-- Add_Pre_Post_Condition --
----------------------------
procedure Add_Pre_Post_Condition is
begin
Set_Next_Pragma (Prag, Pre_Post_Conditions (Items));
Set_Pre_Post_Conditions (Items, Prag);
end Add_Pre_Post_Condition;
-- Local variables
Nam : Name_Id;
PPC : Node_Id;
-- Start of processing for Add_Contract_Item
begin
-- The related context must have a contract and the item to be added
@ -275,14 +319,12 @@ package body Sem_Util is
Name_Initial_Condition,
Name_Initializes)
then
Set_Next_Pragma (Prag, Classifications (Items));
Set_Classifications (Items, Prag);
Add_Classification;
-- Indicator Part_Of must be associated with a package instantiation
elsif Nam = Name_Part_Of and then Is_Generic_Instance (Id) then
Set_Next_Pragma (Prag, Classifications (Items));
Set_Classifications (Items, Prag);
Add_Classification;
-- The pragma is not a proper contract item
@ -295,8 +337,7 @@ package body Sem_Util is
elsif Ekind (Id) = E_Package_Body then
if Nam = Name_Refined_State then
Set_Next_Pragma (Prag, Classifications (Items));
Set_Classifications (Items, Prag);
Add_Classification;
-- The pragma is not a proper contract item
@ -308,6 +349,7 @@ package body Sem_Util is
-- applicable pragmas are:
-- Contract_Cases
-- Depends
-- Extensions_Visible
-- Global
-- Post
-- Postcondition
@ -319,51 +361,49 @@ package body Sem_Util is
or else Is_Generic_Subprogram (Id)
or else Is_Subprogram (Id)
then
if Nam_In (Nam, Name_Precondition,
Name_Postcondition,
Name_Pre,
Name_Post,
if Nam_In (Nam, Name_Pre,
Name_Precondition,
Name_uPre,
Name_Post,
Name_Postcondition,
Name_uPost)
then
-- Before we add a precondition or postcondition to the list,
-- make sure we do not have a disallowed duplicate, which can
-- happen if we use a pragma for Pre[_Class] or Post[_Class]
-- instead of the corresponding aspect.
-- Before we add a precondition or postcondition to the list, make
-- sure we do not have a disallowed duplicate, which can happen if
-- we use a pragma for Pre[_Class] or Post[_Class] instead of the
-- corresponding aspect.
if not From_Aspect_Specification (Prag)
and then Nam_In (Nam, Name_Pre_Class,
Name_Pre,
and then Nam_In (Nam, Name_Pre,
Name_uPre,
Name_Post_Class,
Name_Post,
Name_uPost)
Name_Post_Class)
then
N := Pre_Post_Conditions (Items);
while Present (N) loop
if not Split_PPC (N)
and then Original_Aspect_Name (N) = Nam
PPC := Pre_Post_Conditions (Items);
while Present (PPC) loop
if not Split_PPC (PPC)
and then Original_Aspect_Name (PPC) = Nam
then
Error_Msg_Sloc := Sloc (N);
Error_Msg_Sloc := Sloc (PPC);
Error_Msg_NE
("duplication of aspect for & given#", Prag, Id);
return;
else
N := Next_Pragma (N);
end if;
PPC := Next_Pragma (PPC);
end loop;
end if;
Set_Next_Pragma (Prag, Pre_Post_Conditions (Items));
Set_Pre_Post_Conditions (Items, Prag);
Add_Pre_Post_Condition;
elsif Nam_In (Nam, Name_Contract_Cases, Name_Test_Case) then
Set_Next_Pragma (Prag, Contract_Test_Cases (Items));
Set_Contract_Test_Cases (Items, Prag);
Add_Contract_Test_Case;
elsif Nam_In (Nam, Name_Depends, Name_Global) then
Set_Next_Pragma (Prag, Classifications (Items));
Set_Classifications (Items, Prag);
elsif Nam_In (Nam, Name_Depends,
Name_Extensions_Visible,
Name_Global)
then
Add_Classification;
-- The pragma is not a proper contract item
@ -377,13 +417,11 @@ package body Sem_Util is
-- Refined_Post
elsif Ekind (Id) = E_Subprogram_Body then
if Nam = Name_Refined_Post then
Set_Next_Pragma (Prag, Pre_Post_Conditions (Items));
Set_Pre_Post_Conditions (Items, Prag);
if Nam_In (Nam, Name_Refined_Depends, Name_Refined_Global) then
Add_Classification;
elsif Nam_In (Nam, Name_Refined_Depends, Name_Refined_Global) then
Set_Next_Pragma (Prag, Classifications (Items));
Set_Classifications (Items, Prag);
elsif Nam = Name_Refined_Post then
Add_Pre_Post_Condition;
-- The pragma is not a proper contract item
@ -405,8 +443,7 @@ package body Sem_Util is
Name_Effective_Writes,
Name_Part_Of)
then
Set_Next_Pragma (Prag, Classifications (Items));
Set_Classifications (Items, Prag);
Add_Classification;
-- The pragma is not a proper contract item
@ -5772,6 +5809,84 @@ package body Sem_Util is
end if;
end Explain_Limited_Type;
-------------------------------
-- Extensions_Visible_Status --
-------------------------------
function Extensions_Visible_Status
(Id : Entity_Id) return Extensions_Visible_Mode
is
Arg1 : Node_Id;
Expr : Node_Id;
Prag : Node_Id;
Subp : Entity_Id;
begin
if SPARK_Mode = On then
-- When a formal parameter is subject to Extensions_Visible, the
-- pragma is stored in the contract of related subprogram.
if Is_Formal (Id) then
Subp := Scope (Id);
elsif Is_Subprogram_Or_Generic_Subprogram (Id) then
Subp := Id;
-- No other construct carries this pragma
else
return Extensions_Visible_None;
end if;
Prag := Get_Pragma (Subp, Pragma_Extensions_Visible);
-- Extract the value from the Boolean expression (if any)
if Present (Prag) then
Arg1 := First (Pragma_Argument_Associations (Prag));
-- The pragma appears with an argument
if Present (Arg1) then
Expr := Get_Pragma_Arg (Arg1);
-- Guarg against cascading errors when the argument of pragma
-- Extensions_Visible is not a valid static Boolean expression.
if Error_Posted (Expr) then
return Extensions_Visible_None;
elsif Is_True (Expr_Value (Expr)) then
return Extensions_Visible_True;
else
return Extensions_Visible_False;
end if;
-- Otherwise the pragma defaults to True
else
return Extensions_Visible_True;
end if;
-- Otherwise pragma Expresions_Visible is not inherited or directly
-- specified, its value defaults to "False".
else
return Extensions_Visible_False;
end if;
-- When SPARK_Mode is disabled, all semantic checks related to pragma
-- Extensions_Visible are disabled as well. Instead of saturating the
-- code with "if SPARK_Mode /= Off then" checks, the predicate returns
-- a default value.
else
return Extensions_Visible_None;
end if;
end Extensions_Visible_Status;
-----------------
-- Find_Actual --
-----------------
@ -9330,6 +9445,51 @@ package body Sem_Util is
end if;
end Inherit_Rep_Item_Chain;
---------------------------------
-- Inherit_Subprogram_Contract --
---------------------------------
procedure Inherit_Subprogram_Contract
(Subp : Entity_Id;
From_Subp : Entity_Id)
is
procedure Inherit_Pragma (Prag_Id : Pragma_Id);
-- Propagate a pragma denoted by Prag_Id from From_Subp's contract to
-- Subp's contract.
--------------------
-- Inherit_Pragma --
--------------------
procedure Inherit_Pragma (Prag_Id : Pragma_Id) is
Prag : constant Node_Id := Get_Pragma (From_Subp, Prag_Id);
New_Prag : Node_Id;
begin
-- A pragma cannot be part of more than one First_Pragma/Next_Pragma
-- chains, therefore the node must be replicated. The new pragma is
-- flagged is inherited for distrinction purposes.
if Present (Prag) then
New_Prag := New_Copy_Tree (Prag);
Set_Is_Inherited (New_Prag);
Add_Contract_Item (New_Prag, Subp);
end if;
end Inherit_Pragma;
-- Start of processing for Inherit_Subprogram_Contract
begin
-- Inheritance is carried out only when both subprograms have contracts
if Present (Contract (Subp))
and then Present (Contract (From_Subp))
then
Inherit_Pragma (Pragma_Extensions_Visible);
end if;
end Inherit_Subprogram_Contract;
---------------------------------
-- Insert_Explicit_Dereference --
---------------------------------
@ -10516,6 +10676,71 @@ package body Sem_Util is
end if;
end Is_Expression_Function;
-----------------------
-- Is_EVF_Expression --
-----------------------
function Is_EVF_Expression (N : Node_Id) return Boolean is
Orig_N : constant Node_Id := Original_Node (N);
Alt : Node_Id;
Expr : Node_Id;
Id : Entity_Id;
begin
-- Detect a reference to a formal parameter of a specific tagged type
-- whose related subprogram is subject to pragma Expresions_Visible with
-- value "False".
if Is_Entity_Name (N) and then Present (Entity (N)) then
Id := Entity (N);
return
Is_Formal (Id)
and then Is_Specific_Tagged_Type (Etype (Id))
and then Extensions_Visible_Status (Id) =
Extensions_Visible_False;
-- A case expression is an EVF expression when it contains at least one
-- EVF dependent_expression. Note that a case expression may have been
-- expanded, hence the use of Original_Node.
elsif Nkind (Orig_N) = N_Case_Expression then
Alt := First (Alternatives (Orig_N));
while Present (Alt) loop
if Is_EVF_Expression (Expression (Alt)) then
return True;
end if;
Next (Alt);
end loop;
-- An if expression is an EVF expression when it contains at least one
-- EVF dependent_expression. Note that an if expression may have been
-- expanded, hence the use of Original_Node.
elsif Nkind (Orig_N) = N_If_Expression then
Expr := Next (First (Expressions (Orig_N)));
while Present (Expr) loop
if Is_EVF_Expression (Expr) then
return True;
end if;
Next (Expr);
end loop;
-- A qualified expression or a type conversion is an EVF expression when
-- its operand is an EVF expression.
elsif Nkind_In (N, N_Qualified_Expression,
N_Unchecked_Type_Conversion,
N_Type_Conversion)
then
return Is_EVF_Expression (Expression (N));
end if;
return False;
end Is_EVF_Expression;
--------------
-- Is_False --
--------------
@ -11885,6 +12110,27 @@ package body Sem_Util is
end if;
end Is_SPARK_05_Object_Reference;
-----------------------------
-- Is_Specific_Tagged_Type --
-----------------------------
function Is_Specific_Tagged_Type (Typ : Entity_Id) return Boolean is
Full_Typ : Entity_Id;
begin
-- Handle private types
if Is_Private_Type (Typ) and then Present (Full_View (Typ)) then
Full_Typ := Full_View (Typ);
else
Full_Typ := Typ;
end if;
-- A specific tagged type is a non-class-wide tagged type
return Is_Tagged_Type (Full_Typ) and not Is_Class_Wide_Type (Full_Typ);
end Is_Specific_Tagged_Type;
------------------
-- Is_Statement --
------------------

42
gcc/ada/sem_util.ads
View File

@ -60,6 +60,7 @@ package Sem_Util is
-- Depends
-- Effective_Reads
-- Effective_Writes
-- Extensions_Visible
-- Global
-- Initial_Condition
-- Initializes
@ -566,6 +567,26 @@ package Sem_Util is
-- continuation lines to the message explaining why type T is limited.
-- Messages are placed at node N.
type Extensions_Visible_Mode is
(Extensions_Visible_None,
-- Extensions_Visible does not yield a mode when SPARK_Mode is off. This
-- value acts as a default in a non-SPARK compilation.
Extensions_Visible_False,
-- A value of "False" signifies that Extensions_Visible is either
-- missing or the pragma is present and the value of its Boolean
-- expression is False.
Extensions_Visible_True);
-- A value of "True" signifies that Extensions_Visible is present and
-- the value of its Boolean expression is True.
function Extensions_Visible_Status
(Id : Entity_Id) return Extensions_Visible_Mode;
-- Given the entity of a subprogram or formal parameter subject to pragma
-- Extensions_Visible, return the Boolean value denoted by the expression
-- of the pragma.
procedure Find_Actual
(N : Node_Id;
Formal : out Entity_Id;
@ -1087,6 +1108,14 @@ package Sem_Util is
-- Inherit the rep item chain of type From_Typ without clobbering any
-- existing rep items on Typ's chain. Typ is the destination type.
procedure Inherit_Subprogram_Contract
(Subp : Entity_Id;
From_Subp : Entity_Id);
-- Inherit relevant contract items from source subprogram From_Subp. Subp
-- denotes the destination subprogram. The inherited items are:
-- Extensions_Visible
-- ??? it would be nice if this routine handles Pre'Class and Post'Class
procedure Insert_Explicit_Dereference (N : Node_Id);
-- In a context that requires a composite or subprogram type and where a
-- prefix is an access type, rewrite the access type node N (which is the
@ -1208,6 +1237,16 @@ package Sem_Util is
-- expression function call, and should be inlined unconditionally. Also
-- used to determine that such a call does not constitute a freeze point.
function Is_EVF_Expression (N : Node_Id) return Boolean;
-- Determine whether node N denotes a reference to a formal parameter of
-- a specific tagged type whose related subprogram is subject to pragma
-- Extensions_Visible with value "False". Several other constructs fall
-- under this category:
-- 1) A qualified expression whose operand is EVF
-- 2) A type conversion whose operand is EVF
-- 3) An if expression with at least one EVF dependent_expression
-- 4) A case expression with at least one EVF dependent_expression
function Is_False (U : Uint) return Boolean;
pragma Inline (Is_False);
-- The argument is a Uint value which is the Boolean'Pos value of a Boolean
@ -1345,6 +1384,9 @@ package Sem_Util is
-- constants, formal parameters, and selected_components of those are
-- valid objects in SPARK 2005.
function Is_Specific_Tagged_Type (Typ : Entity_Id) return Boolean;
-- Determine whether an arbitrary [private] type is specifically tagged
function Is_Statement (N : Node_Id) return Boolean;
pragma Inline (Is_Statement);
-- Check if the node N is a statement node. Note that this includes

16
gcc/ada/sinfo.adb
View File

@ -1889,6 +1889,14 @@ package body Sinfo is
return Flag11 (N);
end Is_In_Discriminant_Check;
function Is_Inherited
(N : Node_Id) return Boolean is
begin
pragma Assert (False
or else NT (N).Nkind = N_Pragma);
return Flag4 (N);
end Is_Inherited;
function Is_Machine_Number
(N : Node_Id) return Boolean is
begin
@ -5078,6 +5086,14 @@ package body Sinfo is
Set_Flag11 (N, Val);
end Set_Is_In_Discriminant_Check;
procedure Set_Is_Inherited
(N : Node_Id; Val : Boolean := True) is
begin
pragma Assert (False
or else NT (N).Nkind = N_Pragma);
Set_Flag4 (N, Val);
end Set_Is_Inherited;
procedure Set_Is_Machine_Number
(N : Node_Id; Val : Boolean := True) is
begin

17
gcc/ada/sinfo.ads
View File

@ -1573,6 +1573,10 @@ package Sinfo is
-- discriminant check has a correct value cannot be performed in this
-- case (or the discriminant check may be optimized away).
-- Is_Inherited (Flag4-Sem)
-- This flag is set in an N_Pragma node that appears in a N_Contract node
-- to indicate that the pragma has been inherited from a parent context.
-- Is_Machine_Number (Flag11-Sem)
-- This flag is set in an N_Real_Literal node to indicate that the value
-- is a machine number. This avoids some unnecessary cases of converting
@ -2384,11 +2388,12 @@ package Sinfo is
-- Next_Rep_Item (Node5-Sem)
-- Class_Present (Flag6) set if from Aspect with 'Class
-- From_Aspect_Specification (Flag13-Sem)
-- Import_Interface_Present (Flag16-Sem)
-- Is_Checked (Flag11-Sem)
-- Is_Delayed_Aspect (Flag14-Sem)
-- Is_Disabled (Flag15-Sem)
-- Is_Ignored (Flag9-Sem)
-- Is_Checked (Flag11-Sem)
-- Import_Interface_Present (Flag16-Sem)
-- Is_Inherited (Flag4-Sem)
-- Split_PPC (Flag17) set if corresponding aspect had Split_PPC set
-- Uneval_Old_Accept (Flag7-Sem)
-- Uneval_Old_Warn (Flag18-Sem)
@ -9229,6 +9234,9 @@ package Sinfo is
function Is_In_Discriminant_Check
(N : Node_Id) return Boolean; -- Flag11
function Is_Inherited
(N : Node_Id) return Boolean; -- Flag4
function Is_Machine_Number
(N : Node_Id) return Boolean; -- Flag11
@ -10246,6 +10254,9 @@ package Sinfo is
procedure Set_Is_In_Discriminant_Check
(N : Node_Id; Val : Boolean := True); -- Flag11
procedure Set_Is_Inherited
(N : Node_Id; Val : Boolean := True); -- Flag4
procedure Set_Is_Machine_Number
(N : Node_Id; Val : Boolean := True); -- Flag11
@ -12629,6 +12640,7 @@ package Sinfo is
pragma Inline (Is_Folded_In_Parser);
pragma Inline (Is_Ignored);
pragma Inline (Is_In_Discriminant_Check);
pragma Inline (Is_Inherited);
pragma Inline (Is_Machine_Number);
pragma Inline (Is_Null_Loop);
pragma Inline (Is_Overloaded);
@ -12963,6 +12975,7 @@ package Sinfo is
pragma Inline (Set_Is_Folded_In_Parser);
pragma Inline (Set_Is_Ignored);
pragma Inline (Set_Is_In_Discriminant_Check);
pragma Inline (Set_Is_Inherited);
pragma Inline (Set_Is_Machine_Number);
pragma Inline (Set_Is_Null_Loop);
pragma Inline (Set_Is_Overloaded);

2
gcc/ada/snames.ads-tmpl
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@ -494,6 +494,7 @@ package Snames is
Name_Export_Procedure : constant Name_Id := N + $; -- GNAT
Name_Export_Value : constant Name_Id := N + $; -- GNAT
Name_Export_Valued_Procedure : constant Name_Id := N + $; -- GNAT
Name_Extensions_Visible : constant Name_Id := N + $; -- GNAT
Name_External : constant Name_Id := N + $; -- GNAT
Name_Finalize_Storage_Only : constant Name_Id := N + $; -- GNAT
Name_Global : constant Name_Id := N + $; -- GNAT
@ -1828,6 +1829,7 @@ package Snames is
Pragma_Export_Procedure,
Pragma_Export_Value,
Pragma_Export_Valued_Procedure,
Pragma_Extensions_Visible,
Pragma_External,
Pragma_Finalize_Storage_Only,
Pragma_Global,