X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fada%2Fsem_util.ads;h=1d836843513b93e4ed4b989a91c5ab68dedfcbb1;hb=d6da74485431adc364c4bdeae355f7bc24e6e480;hp=8b6ee893107ad456b8ac92dd716589fae6e3fdea;hpb=b3c77df2cbe4abe8eed06dad6f0579d99724feb5;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/ada/sem_util.ads b/gcc/ada/sem_util.ads index 8b6ee893107..1d836843513 100644 --- a/gcc/ada/sem_util.ads +++ b/gcc/ada/sem_util.ads @@ -6,18 +6,17 @@ -- -- -- S p e c -- -- -- --- Copyright (C) 1992-2006, Free Software Foundation, Inc. -- +-- Copyright (C) 1992-2009, 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. -- @@ -27,6 +26,9 @@ -- Package containing utility procedures used throughout the semantics with Einfo; use Einfo; +with Namet; use Namet; +with Nmake; use Nmake; +with Snames; use Snames; with Types; use Types; with Uintp; use Uintp; with Urealp; use Urealp; @@ -41,6 +43,14 @@ package Sem_Util is -- Add A to the list of access types to process when expanding the -- freeze node of E. + procedure Add_Global_Declaration (N : Node_Id); + -- These procedures adds a declaration N at the library level, to be + -- elaborated before any other code in the unit. It is used for example + -- for the entity that marks whether a unit has been elaborated. The + -- declaration is added to the Declarations list of the Aux_Decls_Node + -- for the current unit. The declarations are added in the current scope, + -- so the caller should push a new scope as required before the call. + function Alignment_In_Bits (E : Entity_Id) return Uint; -- If the alignment of the type or object E is currently known to the -- compiler, then this function returns the alignment value in bits. @@ -120,23 +130,55 @@ package Sem_Util is -- place error message on node N. Used in object declarations, type -- conversions, qualified expressions. + procedure Check_Nested_Access (Ent : Entity_Id); + -- Check whether Ent denotes an entity declared in an uplevel scope, which + -- is accessed inside a nested procedure, and set Has_Up_Level_Access flag + -- accordingly. This is currently only enabled for VM_Target /= No_VM. + procedure Check_Potentially_Blocking_Operation (N : Node_Id); -- N is one of the statement forms that is a potentially blocking -- operation. If it appears within a protected action, emit warning. + procedure Check_Unprotected_Access + (Context : Node_Id; + Expr : Node_Id); + -- Check whether the expression is a pointer to a protected component, + -- and the context is external to the protected operation, to warn against + -- a possible unlocked access to data. + procedure Check_VMS (Construct : Node_Id); -- Check that this the target is OpenVMS, and if so, return with -- no effect, otherwise post an error noting this can only be used -- with OpenVMS ports. The argument is the construct in question -- and is used to post the error message. - procedure Collect_Abstract_Interfaces - (T : Entity_Id; - Ifaces_List : out Elist_Id; - Exclude_Parent_Interfaces : Boolean := False); + procedure Collect_Interfaces + (T : Entity_Id; + Ifaces_List : out Elist_Id; + Exclude_Parents : Boolean := False; + Use_Full_View : Boolean := True); -- Ada 2005 (AI-251): Collect whole list of abstract interfaces that are - -- directly or indirectly implemented by T. Exclude_Parent_Interfaces is - -- used to avoid addition of inherited interfaces to the generated list. + -- directly or indirectly implemented by T. Exclude_Parents is used to + -- avoid the addition of inherited interfaces to the generated list. + -- Use_Full_View is used to collect the interfaces using the full-view + -- (if available). + + procedure Collect_Interface_Components + (Tagged_Type : Entity_Id; + Components_List : out Elist_Id); + -- Ada 2005 (AI-251): Collect all the tag components associated with the + -- secondary dispatch tables of a tagged type. + + procedure Collect_Interfaces_Info + (T : Entity_Id; + Ifaces_List : out Elist_Id; + Components_List : out Elist_Id; + Tags_List : out Elist_Id); + -- Ada 2005 (AI-251): Collect all the interfaces associated with T plus + -- the record component and tag associated with each of these interfaces. + -- On exit Ifaces_List, Components_List and Tags_List have the same number + -- of elements, and elements at the same position on these tables provide + -- information on the same interface type. function Collect_Primitive_Operations (T : Entity_Id) return Elist_Id; -- Called upon type derivation and extension. We scan the declarative @@ -161,6 +203,12 @@ package Sem_Util is -- Sets the Has_Delayed_Freeze flag of New if the Delayed_Freeze flag -- of Old is set and Old has no yet been Frozen (i.e. Is_Frozen is false); + function Copy_Parameter_List (Subp_Id : Entity_Id) return List_Id; + -- Utility to create a parameter profile for a new subprogram spec, + -- when the subprogram has a body that acts as spec. This is done for + -- some cases of inlining, and for private protected ops. Also used + -- to create bodies for stubbed subprograms. + function Current_Entity (N : Node_Id) return Entity_Id; -- Find the currently visible definition for a given identifier, that is to -- say the first entry in the visibility chain for the Chars of N. @@ -197,6 +245,9 @@ package Sem_Util is -- components of protected types, and constraint checks on entry -- families constrained by discriminants. + function Denotes_Variable (N : Node_Id) return Boolean; + -- Returns True if node N denotes a single variable without parentheses + function Depends_On_Discriminant (N : Node_Id) return Boolean; -- Returns True if N denotes a discriminant or if N is a range, a subtype -- indication or a scalar subtype where one of the bounds is a @@ -249,6 +300,17 @@ package Sem_Util is -- adds additional continuation lines to the message explaining -- why type T is limited. Messages are placed at node N. + procedure Find_Actual + (N : Node_Id; + Formal : out Entity_Id; + Call : out Node_Id); + -- Determines if the node N is an actual parameter of a procedure call. If + -- so, then Formal points to the entity for the formal (whose Ekind is one + -- of E_In_Parameter, E_Out_Parameter, E_In_Out_Parameter) and Call is set + -- to the node for the corresponding call. If the node N is not an actual + -- parameter, or is an actual parameter of a function call, then Formal and + -- Call are set to Empty. + function Find_Corresponding_Discriminant (Id : Node_Id; Typ : Entity_Id) return Entity_Id; @@ -258,6 +320,26 @@ package Sem_Util is -- denotes when analyzed. Subsequent uses of this id on a different -- type denote the discriminant at the same position in this new type. + procedure Find_Overlaid_Entity + (N : Node_Id; + Ent : out Entity_Id; + Off : out Boolean); + -- The node N should be an address representation clause. Determines if + -- the target expression is the address of an entity with an optional + -- offset. If so, set Ent to the entity and, if there is an offset, set + -- Off to True, otherwise to False. If N is not an address representation + -- clause, or if it is not possible to determine that the address is of + -- this form, then set Ent to Empty. + + function Find_Parameter_Type (Param : Node_Id) return Entity_Id; + -- Return the type of formal parameter Param as determined by its + -- specification. + + function Find_Static_Alternative (N : Node_Id) return Node_Id; + -- N is a case statement whose expression is a compile-time value. + -- Determine the alternative chosen, so that the code of non-selected + -- alternatives, and the warnings that may apply to them, are removed. + function First_Actual (Node : Node_Id) return Node_Id; -- Node is an N_Function_Call or N_Procedure_Call_Statement node. The -- result returned is the first actual parameter in declaration order @@ -275,11 +357,6 @@ package Sem_Util is -- name in upper case. An ASCII.NUL is appended as the last character. -- The names in the string are generated by Namet.Get_Decoded_Name_String. - function Find_Static_Alternative (N : Node_Id) return Node_Id; - -- N is a case statement whose expression is a compile-time value. - -- Determine the alternative chosen, so that the code of non-selected - -- alternatives, and the warnings that may apply to them, are removed. - procedure Gather_Components (Typ : Entity_Id; Comp_List : Node_Id; @@ -356,7 +433,7 @@ package Sem_Util is Pos : Uint; Loc : Source_Ptr) return Entity_Id; -- This function obtains the E_Enumeration_Literal entity for the - -- specified value from the enumneration type or subtype T. The + -- specified value from the enumeration type or subtype T. The -- second argument is the Pos value, which is assumed to be in range. -- The third argument supplies a source location for constructed -- nodes returned by this function. @@ -371,17 +448,27 @@ package Sem_Util is -- which is the innermost visible entity with the given name. See the -- body of Sem_Ch8 for further details on handling of entity visibility. + function Get_Pragma_Id (N : Node_Id) return Pragma_Id; + pragma Inline (Get_Pragma_Id); + -- Obtains the Pragma_Id from the Chars field of Pragma_Identifier (N) + + function Get_Referenced_Object (N : Node_Id) return Node_Id; + -- Given a node, return the renamed object if the node represents a renamed + -- object, otherwise return the node unchanged. The node may represent an + -- arbitrary expression. + + function Get_Renamed_Entity (E : Entity_Id) return Entity_Id; + -- Given an entity for an exception, package, subprogram or generic unit, + -- returns the ultimately renamed entity if this is a renaming. If this is + -- not a renamed entity, returns its argument. It is an error to call this + -- with any other kind of entity. + function Get_Subprogram_Entity (Nod : Node_Id) return Entity_Id; -- Nod is either a procedure call statement, or a function call, or -- an accept statement node. This procedure finds the Entity_Id of the -- related subprogram or entry and returns it, or if no subprogram can -- be found, returns Empty. - function Get_Referenced_Object (N : Node_Id) return Node_Id; - -- Given a node, return the renamed object if the node represents - -- a renamed object, otherwise return the node unchanged. The node - -- may represent an arbitrary expression. - function Get_Subprogram_Body (E : Entity_Id) return Node_Id; -- Given the entity for a subprogram (E_Function or E_Procedure), -- return the corresponding N_Subprogram_Body node. If the corresponding @@ -395,19 +482,18 @@ package Sem_Util is -- declaration. function Has_Access_Values (T : Entity_Id) return Boolean; - -- Returns true if type or subtype T is an access type, or has a - -- component (at any recursive level) that is an access type. This - -- is a conservative predicate, if it is not known whether or not - -- T contains access values (happens for generic formals in some - -- cases), then False is returned. + -- Returns true if type or subtype T is an access type, or has a component + -- (at any recursive level) that is an access type. This is a conservative + -- predicate, if it is not known whether or not T contains access values + -- (happens for generic formals in some cases), then False is returned. + -- Note that tagged types return False. Even though the tag is implemented + -- as an access type internally, this function tests only for access types + -- known to the programmer. See also Has_Tagged_Component. type Alignment_Result is (Known_Compatible, Unknown, Known_Incompatible); -- Result of Has_Compatible_Alignment test, description found below. Note -- that the values are arranged in increasing order of problematicness. - function Has_Abstract_Interfaces (Tagged_Type : Entity_Id) return Boolean; - -- Returns true if Tagged_Type implements some abstract interface - function Has_Compatible_Alignment (Obj : Entity_Id; Expr : Node_Id) return Alignment_Result; @@ -440,11 +526,23 @@ package Sem_Util is -- Determines if the range of the floating-point type E includes -- infinities. Returns False if E is not a floating-point type. + function Has_Interfaces + (T : Entity_Id; + Use_Full_View : Boolean := True) return Boolean; + -- Where T is a concurrent type or a record type, returns true if T covers + -- any abstract interface types. In case of private types the argument + -- Use_Full_View controls if the check is done using its full view (if + -- available). + function Has_Null_Exclusion (N : Node_Id) return Boolean; -- Determine whether node N has a null exclusion + function Has_Overriding_Initialize (T : Entity_Id) return Boolean; + -- Predicate to determine whether a controlled type has a user-defined + -- Initialize primitive, which makes the type not preelaborable. + function Has_Preelaborable_Initialization (E : Entity_Id) return Boolean; - -- Return True iff type E has preelaborable initialiation as defined in + -- Return True iff type E has preelaborable initialization as defined in -- Ada 2005 (see AI-161 for details of the definition of this attribute). function Has_Private_Component (Type_Id : Entity_Id) return Boolean; @@ -460,8 +558,17 @@ package Sem_Util is -- if there is no underlying type). function Has_Tagged_Component (Typ : Entity_Id) return Boolean; - -- Typ must be a composite type (array or record). This function is used - -- to check if '=' has to be expanded into a bunch component comparaisons. + -- Returns True if Typ is a composite type (array or record) which is + -- either itself a tagged type, or has a component (recursively) which is + -- a tagged type. Returns False for non-composite type, or if no tagged + -- component is present. This function is used to check if '=' has to be + -- expanded into a bunch component comparisons. + + function Implements_Interface + (Typ_Ent : Entity_Id; + Iface_Ent : Entity_Id; + Exclude_Parents : Boolean := False) return Boolean; + -- Returns true if the Typ implements interface Iface function In_Instance return Boolean; -- Returns True if the current scope is within a generic instance @@ -481,6 +588,9 @@ package Sem_Util is function In_Package_Body return Boolean; -- Returns True if current scope is within a package body + function In_Parameter_Specification (N : Node_Id) return Boolean; + -- Returns True if node N belongs to a parameter specification + function In_Subprogram_Or_Concurrent_Unit return Boolean; -- Determines if the current scope is within a subprogram compilation -- unit (inside a subprogram declaration, subprogram body, or generic @@ -499,6 +609,11 @@ package Sem_Util is -- N (which is the prefix, e.g. of an indexed component) as an -- explicit dereference. + procedure Inspect_Deferred_Constant_Completion (Decls : List_Id); + -- Examine all deferred constants in the declaration list Decls and check + -- whether they have been completed by a full constant declaration or an + -- Import pragma. Emit the error message if that is not the case. + function Is_AAMP_Float (E : Entity_Id) return Boolean; -- Defined for all type entities. Returns True only for the base type -- of float types with AAMP format. The particular format is determined @@ -524,11 +639,18 @@ package Sem_Util is -- Determines if the given node denotes an atomic object in the sense -- of the legality checks described in RM C.6(12). + function Is_Coextension_Root (N : Node_Id) return Boolean; + -- Determine whether node N is an allocator which acts as a coextension + -- root. + function Is_Controlling_Limited_Procedure (Proc_Nam : Entity_Id) return Boolean; -- Ada 2005 (AI-345): Determine whether Proc_Nam is a primitive procedure -- of a limited interface with a controlling first parameter. + function Is_CPP_Constructor_Call (N : Node_Id) return Boolean; + -- Returns True if N is a call to a CPP constructor + function Is_Dependent_Component_Of_Mutable_Object (Object : Node_Id) return Boolean; -- Returns True if Object is the name of a subcomponent that @@ -548,10 +670,9 @@ package Sem_Util is -- This is the RM definition, a type is a descendent of another type if it -- is the same type or is derived from a descendent of the other type. - function Is_Descendent_Of_Address (T1 : Entity_Id) return Boolean; - -- Returns True if type T1 is a descendent of Address or its base type. - -- Similar to calling Is_Descendent_Of with Base_Type (RTE (RE_Address)) - -- except that it avoids creating an unconditional dependency on System. + function Is_Concurrent_Interface (T : Entity_Id) return Boolean; + -- First determine whether type T is an interface and then check whether + -- it is of protected, synchronized or task kind. function Is_False (U : Uint) return Boolean; -- The argument is a Uint value which is the Boolean'Pos value of a @@ -581,7 +702,7 @@ package Sem_Util is -- i.e. a library unit or an entity declared in a library package. function Is_Local_Variable_Reference (Expr : Node_Id) return Boolean; - -- Determines whether Expr is a refeference to a variable or IN OUT + -- Determines whether Expr is a reference to a variable or IN OUT -- mode parameter of the current enclosing subprogram. -- Why are OUT parameters not considered here ??? @@ -596,13 +717,6 @@ package Sem_Util is -- is a variable (in the Is_Variable sense) with a non-tagged type -- target are considered view conversions and hence variables. - function Is_Parent - (E1 : Entity_Id; - E2 : Entity_Id) return Boolean; - -- Determine whether E1 is a parent of E2. For a concurrent type, the - -- parent is the first element of its list of interface types; for other - -- types, this function provides the same result as Is_Ancestor. - function Is_Partially_Initialized_Type (Typ : Entity_Id) return Boolean; -- Typ is a type entity. This function returns true if this type is -- partly initialized, meaning that an object of the type is at least @@ -619,6 +733,10 @@ package Sem_Util is -- persistent. A private type is potentially persistent if the full type -- is potentially persistent. + function Is_Protected_Self_Reference (N : Node_Id) return Boolean; + -- Return True if node N denotes a protected type name which represents + -- the current instance of a protected object according to RM 9.4(21/2). + function Is_RCI_Pkg_Spec_Or_Body (Cunit : Node_Id) return Boolean; -- Return True if a compilation unit is the specification or the -- body of a remote call interface package. @@ -638,7 +756,7 @@ package Sem_Util is function Is_Selector_Name (N : Node_Id) return Boolean; -- Given an N_Identifier node N, determines if it is a Selector_Name. -- As described in Sinfo, Selector_Names are special because they - -- represent use of the N_Identifier node for a true identifer, when + -- represent use of the N_Identifier node for a true identifier, when -- normally such nodes represent a direct name. function Is_Statement (N : Node_Id) return Boolean; @@ -647,6 +765,9 @@ package Sem_Util is -- the N_Statement_Other_Than_Procedure_Call subtype from Sinfo). -- Note that a label is *not* a statement, and will return False. + function Is_Synchronized_Tagged_Type (E : Entity_Id) return Boolean; + -- Returns True if E is a synchronized tagged type (AARM 3.9.4 (6/2)) + function Is_Transfer (N : Node_Id) return Boolean; -- Returns True if the node N is a statement which is known to cause -- an unconditional transfer of control at runtime, i.e. the following @@ -657,6 +778,12 @@ package Sem_Util is -- Boolean operand (i.e. is either 0 for False, or 1 for True). This -- function simply tests if it is True (i.e. non-zero) + function Is_Value_Type (T : Entity_Id) return Boolean; + -- Returns true if type T represents a value type. This is only relevant to + -- CIL, will always return false for other targets. + -- What is a "value type", since this is not an Ada term, it should be + -- defined here ??? + function Is_Variable (N : Node_Id) return Boolean; -- Determines if the tree referenced by N represents a variable, i.e. -- can appear on the left side of an assignment. There is one situation, @@ -672,31 +799,44 @@ package Sem_Util is -- here is for something actually declared as volatile, not for an object -- that gets treated as volatile (see Einfo.Treat_As_Volatile). - procedure Kill_Current_Values; + procedure Kill_Current_Values (Last_Assignment_Only : Boolean := False); -- This procedure is called to clear all constant indications from all -- entities in the current scope and in any parent scopes if the current - -- scope is a block or a package (and that recursion continues to the - -- top scope that is not a block or a package). This is used when the - -- sequential flow-of-control assumption is violated (occurence of a - -- label, head of a loop, or start of an exception handler). The effect - -- of the call is to clear the Constant_Value field (but we do not need - -- to clear the Is_True_Constant flag, since that only gets reset if - -- there really is an assignment somewhere in the entity scope). This - -- procedure also calls Kill_All_Checks, since this is a special case - -- of needing to forget saved values. This procedure also clears any - -- Is_Known_Non_Null flags in variables, constants or parameters - -- since these are also not known to be valid. - - procedure Kill_Current_Values (Ent : Entity_Id); + -- scope is a block or a package (and that recursion continues to the top + -- scope that is not a block or a package). This is used when the + -- sequential flow-of-control assumption is violated (occurrence of a + -- label, head of a loop, or start of an exception handler). The effect of + -- the call is to clear the Constant_Value field (but we do not need to + -- clear the Is_True_Constant flag, since that only gets reset if there + -- really is an assignment somewhere in the entity scope). This procedure + -- also calls Kill_All_Checks, since this is a special case of needing to + -- forget saved values. This procedure also clears Is_Known_Non_Null flags + -- in variables, constants or parameters since these are also not known to + -- be valid. + -- + -- The Last_Assignment_Only flag is set True to clear only Last_Assignment + -- fields and leave other fields unchanged. This is used when we encounter + -- an unconditional flow of control change (return, goto, raise). In such + -- cases we don't need to clear the current values, since it may be that + -- the flow of control change occurs in a conditional context, and if it + -- is not taken, then it is just fine to keep the current values. But the + -- Last_Assignment field is different, if we have a sequence assign-to-v, + -- conditional-return, assign-to-v, we do not want to complain that the + -- second assignment clobbers the first. + + procedure Kill_Current_Values + (Ent : Entity_Id; + Last_Assignment_Only : Boolean := False); -- This performs the same processing as described above for the form with -- no argument, but for the specific entity given. The call has no effect - -- if the entity Ent is not for an object. + -- if the entity Ent is not for an object. Again, Last_Assignment_Only is + -- set if you want to clear only the Last_Assignment field (see above). procedure Kill_Size_Check_Code (E : Entity_Id); - -- Called when an address clause or pragma Import is applied to an - -- entity. If the entity is a variable or a constant, and size check - -- code is present, this size check code is killed, since the object - -- will not be allocated by the program. + -- Called when an address clause or pragma Import is applied to an entity. + -- If the entity is a variable or a constant, and size check code is + -- present, this size check code is killed, since the object will not + -- be allocated by the program. function Known_To_Be_Assigned (N : Node_Id) return Boolean; -- The node N is an entity reference. This function determines whether the @@ -705,6 +845,28 @@ package Sem_Util is -- direction. Cases which may possibly be assignments but are not known to -- be may return True from May_Be_Lvalue, but False from this function. + function Make_Simple_Return_Statement + (Sloc : Source_Ptr; + Expression : Node_Id := Empty) return Node_Id + renames Make_Return_Statement; + -- See Sinfo. We rename Make_Return_Statement to the correct Ada 2005 + -- terminology here. Clients should use Make_Simple_Return_Statement. + + Make_Return_Statement : constant := -2 ** 33; + -- Attempt to prevent accidental uses of Make_Return_Statement. If this + -- and the one in Nmake are both potentially use-visible, it will cause + -- a compilation error. Note that type and value are irrelevant. + + N_Return_Statement : constant := -2**33; + -- Attempt to prevent accidental uses of N_Return_Statement; similar to + -- Make_Return_Statement above. + + procedure Mark_Coextensions (Context_Nod : Node_Id; Root_Nod : Node_Id); + -- Given a node which designates the context of analysis and an origin in + -- the tree, traverse from Root_Nod and mark all allocators as either + -- dynamic or static depending on Context_Nod. Any erroneous marking is + -- cleaned up during resolution. + function May_Be_Lvalue (N : Node_Id) return Boolean; -- Determines if N could be an lvalue (e.g. an assignment left hand side). -- An lvalue is defined as any expression which appears in a context where @@ -721,6 +883,57 @@ package Sem_Util is -- formal. Used in Ada 2005 mode to solve the syntactic ambiguity that -- results from an indexing of a function call written in prefix form. + function New_Copy_List_Tree (List : List_Id) return List_Id; + -- Copy recursively an analyzed list of nodes. Uses New_Copy_Tree defined + -- below. As for New_Copy_Tree, it is illegal to attempt to copy extended + -- nodes (entities) either directly or indirectly using this function. + + function New_Copy_Tree + (Source : Node_Id; + Map : Elist_Id := No_Elist; + New_Sloc : Source_Ptr := No_Location; + New_Scope : Entity_Id := Empty) return Node_Id; + -- Given a node that is the root of a subtree, Copy_Tree copies the entire + -- syntactic subtree, including recursively any descendents whose parent + -- field references a copied node (descendents not linked to a copied node + -- by the parent field are not copied, instead the copied tree references + -- the same descendent as the original in this case, which is appropriate + -- for non-syntactic fields such as Etype). The parent pointers in the + -- copy are properly set. Copy_Tree (Empty/Error) returns Empty/Error. + -- The one exception to the rule of not copying semantic fields is that + -- any implicit types attached to the subtree are duplicated, so that + -- the copy contains a distinct set of implicit type entities. Thus this + -- function is used when it is necessary to duplicate an analyzed tree, + -- declared in the same or some other compilation unit. This function is + -- declared here rather than in atree because it uses semantic information + -- in particular concerning the structure of itypes and the generation of + -- public symbols. + + -- The Map argument, if set to a non-empty Elist, specifies a set of + -- mappings to be applied to entities in the tree. The map has the form: + -- + -- old entity 1 + -- new entity to replace references to entity 1 + -- old entity 2 + -- new entity to replace references to entity 2 + -- ... + -- + -- The call destroys the contents of Map in this case + -- + -- The parameter New_Sloc, if set to a value other than No_Location, is + -- used as the Sloc value for all nodes in the new copy. If New_Sloc is + -- set to its default value No_Location, then the Sloc values of the + -- nodes in the copy are simply copied from the corresponding original. + -- + -- The Comes_From_Source indication is unchanged if New_Sloc is set to + -- the default No_Location value, but is reset if New_Sloc is given, since + -- in this case the result clearly is neither a source node or an exact + -- copy of a source node. + -- + -- The parameter New_Scope, if set to a value other than Empty, is the + -- value to use as the Scope for any Itypes that are copied. The most + -- typical value for this parameter, if given, is Current_Scope. + function New_External_Entity (Kind : Entity_Kind; Scope_Id : Entity_Id; @@ -759,7 +972,7 @@ package Sem_Util is -- next entry of the Parameter_Associations list. The argument is an -- actual previously returned by a call to First_Actual or Next_Actual. -- Note that the result produced is always an expression, not a parameter - -- assciation node, even if named notation was used. + -- association node, even if named notation was used. procedure Normalize_Actuals (N : Node_Id; @@ -767,33 +980,32 @@ package Sem_Util is Report : Boolean; Success : out Boolean); -- Reorders lists of actuals according to names of formals, value returned - -- in Success indicates sucess of reordering. For more details, see body. + -- in Success indicates success of reordering. For more details, see body. -- Errors are reported only if Report is set to True. - procedure Note_Possible_Modification (N : Node_Id); + procedure Note_Possible_Modification (N : Node_Id; Sure : Boolean); -- This routine is called if the sub-expression N maybe the target of -- an assignment (e.g. it is the left side of an assignment, used as -- an out parameters, or used as prefixes of access attributes). It -- sets May_Be_Modified in the associated entity if there is one, -- taking into account the rule that in the case of renamed objects, -- it is the flag in the renamed object that must be set. + -- + -- The parameter Sure is set True if the modification is sure to occur + -- (e.g. target of assignment, or out parameter), and to False if the + -- modification is only potential (e.g. address of entity taken). function Object_Access_Level (Obj : Node_Id) return Uint; -- Return the accessibility level of the view of the object Obj. -- For convenience, qualified expressions applied to object names -- are also allowed as actuals for this function. - function Overrides_Synchronized_Primitive - (Def_Id : Entity_Id; - First_Hom : Entity_Id; - Ifaces_List : Elist_Id; - In_Scope : Boolean := True) return Entity_Id; - -- Determine whether entry or subprogram Def_Id overrides a primitive - -- operation that belongs to one of the interfaces in Ifaces_List. A - -- specific homonym chain can be specified by setting First_Hom. Flag - -- In_Scope is used to designate whether the entry or subprogram was - -- declared inside the scope of the synchronized type or after. Return - -- the overriden entity or Empty. + function Primitive_Names_Match (E1, E2 : Entity_Id) return Boolean; + -- Returns True if the names of both entities correspond with matching + -- primitives. This routine includes support for the case in which one + -- or both entities correspond with entities built by Derive_Subprogram + -- with a special name to avoid being overridden (i.e. return true in case + -- of entities with names "nameP" and "name" or vice versa). function Private_Component (Type_Id : Entity_Id) return Entity_Id; -- Returns some private component (if any) of the given Type_Id. @@ -818,6 +1030,13 @@ package Sem_Util is -- S is a possibly signed syntactically valid real literal. The result -- returned is an N_Real_Literal node representing the literal value. + function References_Generic_Formal_Type (N : Node_Id) return Boolean; + -- Returns True if the expression Expr contains any references to a + -- generic type. This can only happen within a generic template. + + procedure Remove_Homonym (E : Entity_Id); + -- Removes E from the homonym chain + function Rep_To_Pos_Flag (E : Entity_Id; Loc : Source_Ptr) return Node_Id; -- This is used to construct the second argument in a call to Rep_To_Pos -- which is Standard_True if range checks are enabled (E is an entity to @@ -870,7 +1089,15 @@ package Sem_Util is -- capture actual value information, but we can capture conditional tests. function Same_Name (N1, N2 : Node_Id) return Boolean; - -- Determine if two (possibly expanded) names are the same name + -- Determine if two (possibly expanded) names are the same name. This is + -- a purely syntactic test, and N1 and N2 need not be analyzed. + + function Same_Object (Node1, Node2 : Node_Id) return Boolean; + -- Determine if Node1 and Node2 are known to designate the same object. + -- This is a semantic test and both nodes must be fully analyzed. A result + -- of True is decisively correct. A result of False does not necessarily + -- mean that different objects are designated, just that this could not + -- be reliably determined at compile time. function Same_Type (T1, T2 : Entity_Id) return Boolean; -- Determines if T1 and T2 represent exactly the same type. Two types @@ -881,6 +1108,13 @@ package Sem_Util is -- False is indecisive (e.g. the compiler may not be able to tell that -- two constraints are identical). + function Same_Value (Node1, Node2 : Node_Id) return Boolean; + -- Determines if Node1 and Node2 are known to be the same value, which is + -- true if they are both compile time known values and have the same value, + -- or if they are the same object (in the sense of function Same_Object). + -- A result of False does not necessarily mean they have different values, + -- just that it is not possible to determine they have the same value. + function Scope_Within_Or_Same (Scope1, Scope2 : Entity_Id) return Boolean; -- Determines if the entity Scope1 is the same as Scope2, or if it is -- inside it, where both entities represent scopes. Note that scopes @@ -891,10 +1125,23 @@ package Sem_Util is -- Like Scope_Within_Or_Same, except that this function returns -- False in the case where Scope1 and Scope2 are the same scope. + procedure Set_Convention (E : Entity_Id; Val : Convention_Id); + -- Same as Basic_Set_Convention, but with an extra check for access types. + -- In particular, if E is an access-to-subprogram type, and Val is a + -- foreign convention, then we set Can_Use_Internal_Rep to False on E. + procedure Set_Current_Entity (E : Entity_Id); -- Establish the entity E as the currently visible definition of its -- associated name (i.e. the Node_Id associated with its name) + procedure Set_Debug_Info_Needed (T : Entity_Id); + -- Sets the Debug_Info_Needed flag on entity T , and also on any entities + -- that are needed by T (for an object, the type of the object is needed, + -- and for a type, various subsidiary types are needed -- see body for + -- details). Never has any effect on T if the Debug_Info_Off flag is set. + -- This routine should always be used instead of Set_Needs_Debug_Info to + -- ensure that subsidiary entities are properly handled. + procedure Set_Entity_With_Style_Check (N : Node_Id; Val : Entity_Id); -- This procedure has the same calling sequence as Set_Entity, but -- if Style_Check is set, then it calls a style checking routine which @@ -911,11 +1158,22 @@ package Sem_Util is -- parameters are already members of a list, and do not need to be -- chained separately. See also First_Actual and Next_Actual. + procedure Set_Optimize_Alignment_Flags (E : Entity_Id); + pragma Inline (Set_Optimize_Alignment_Flags); + -- Sets Optimize_Alignment_Space/Time flags in E from current settings + procedure Set_Public_Status (Id : Entity_Id); -- If an entity (visible or otherwise) is defined in a library -- package, or a package that is itself public, then this subprogram -- labels the entity public as well. + procedure Set_Referenced_Modified (N : Node_Id; Out_Param : Boolean); + -- N is the node for either a left hand side (Out_Param set to False), + -- or an Out or In_Out parameter (Out_Param set to True). If there is + -- an assignable entity being referenced, then the appropriate flag + -- (Referenced_As_LHS if Out_Param is False, Referenced_As_Out_Parameter + -- if Out_Param is True) is set True, and the other flag set False. + procedure Set_Scope_Is_Transient (V : Boolean := True); -- Set the flag Is_Transient of the current scope @@ -926,7 +1184,7 @@ package Sem_Util is -- value from T2 to T1. It does NOT copy the RM_Size field, which must be -- separately set if this is required to be copied also. - function Scope_Is_Transient return Boolean; + function Scope_Is_Transient return Boolean; -- True if the current scope is transient function Static_Integer (N : Node_Id) return Uint; @@ -952,6 +1210,10 @@ package Sem_Util is function Type_Access_Level (Typ : Entity_Id) return Uint; -- Return the accessibility level of Typ + function Ultimate_Alias (Prim : Entity_Id) return Entity_Id; + -- Return the last entity in the chain of aliased entities of Prim. + -- If Prim has no alias return Prim. + function Unit_Declaration_Node (Unit_Id : Entity_Id) return Node_Id; -- Unit_Id is the simple name of a program unit, this function returns the -- corresponding xxx_Declaration node for the entity. Also applies to the