| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- E X P _ C H 6 -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 1992-2021, 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 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 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. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- Expand routines for chapter 6 constructs |
| |
| with Types; use Types; |
| |
| package Exp_Ch6 is |
| |
| procedure Expand_N_Extended_Return_Statement (N : Node_Id); |
| procedure Expand_N_Function_Call (N : Node_Id); |
| procedure Expand_N_Procedure_Call_Statement (N : Node_Id); |
| procedure Expand_N_Return_When_Statement (N : Node_Id); |
| procedure Expand_N_Simple_Return_Statement (N : Node_Id); |
| procedure Expand_N_Subprogram_Body (N : Node_Id); |
| procedure Expand_N_Subprogram_Body_Stub (N : Node_Id); |
| procedure Expand_N_Subprogram_Declaration (N : Node_Id); |
| |
| procedure Expand_Call (N : Node_Id); |
| -- This procedure contains common processing for Expand_N_Function_Call, |
| -- Expand_N_Procedure_Statement, and Expand_N_Entry_Call. |
| |
| procedure Freeze_Subprogram (N : Node_Id); |
| -- generate the appropriate expansions related to Subprogram freeze |
| -- nodes (e.g. the filling of the corresponding Dispatch Table for |
| -- Primitive Operations) |
| |
| -- The following type defines the various forms of allocation used for the |
| -- results of build-in-place function calls. |
| |
| type BIP_Allocation_Form is |
| (Unspecified, |
| Caller_Allocation, |
| Secondary_Stack, |
| Global_Heap, |
| User_Storage_Pool); |
| |
| type BIP_Formal_Kind is |
| -- Ada 2005 (AI-318-02): This type defines the kinds of implicit extra |
| -- formals created for build-in-place functions. The order of these |
| -- enumeration literals matches the order in which the formals are |
| -- declared. See Sem_Ch6.Create_Extra_Formals. |
| |
| (BIP_Alloc_Form, |
| -- Present if result subtype is unconstrained or tagged. Indicates |
| -- whether the return object is allocated by the caller or callee, and |
| -- if the callee, whether to use the secondary stack or the heap. See |
| -- Create_Extra_Formals. |
| |
| BIP_Storage_Pool, |
| -- Present if result subtype is unconstrained or tagged. If |
| -- BIP_Alloc_Form = User_Storage_Pool, this is a pointer to the pool |
| -- (of type access to Root_Storage_Pool'Class). Otherwise null. |
| |
| BIP_Finalization_Master, |
| -- Present if result type needs finalization. Pointer to caller's |
| -- finalization master. |
| |
| BIP_Task_Master, |
| -- Present if result type contains tasks. Master associated with |
| -- calling context. |
| |
| BIP_Activation_Chain, |
| -- Present if result type contains tasks. Caller's activation chain |
| |
| BIP_Object_Access); |
| -- Present for all build-in-place functions. Address at which to place |
| -- the return object, or null if BIP_Alloc_Form indicates allocated by |
| -- callee. |
| -- |
| -- ??? We might also need to be able to pass in a constrained flag. |
| |
| procedure Add_Extra_Actual_To_Call |
| (Subprogram_Call : Node_Id; |
| Extra_Formal : Entity_Id; |
| Extra_Actual : Node_Id); |
| -- Adds Extra_Actual as a named parameter association for the formal |
| -- Extra_Formal in Subprogram_Call. |
| |
| function BIP_Formal_Suffix (Kind : BIP_Formal_Kind) return String; |
| -- Ada 2005 (AI-318-02): Returns a string to be used as the suffix of names |
| -- for build-in-place formal parameters of the given kind. |
| |
| function BIP_Suffix_Kind (E : Entity_Id) return BIP_Formal_Kind; |
| -- Ada 2005 (AI-318-02): Returns the kind of the given BIP extra formal. |
| |
| function Build_In_Place_Formal |
| (Func : Entity_Id; |
| Kind : BIP_Formal_Kind) return Entity_Id; |
| -- Ada 2005 (AI-318-02): Locates and returns the entity for the implicit |
| -- build-in-place formal parameter of the given kind associated with the |
| -- function Func, and returns its Entity_Id. It is a bug if not found; the |
| -- caller should ensure this is called only when the extra formal exists. |
| |
| function Build_Procedure_Body_Form |
| (Func_Id : Entity_Id; Func_Body : Node_Id) return Node_Id; |
| -- Create a procedure body which emulates the behavior of function Func_Id. |
| -- Func_Body is the root of the body of the function before its analysis. |
| -- The returned node is the root of the procedure body which will replace |
| -- the original function body, which is not needed for the C program. |
| |
| procedure Install_Class_Preconditions_Check (Call_Node : Node_Id); |
| -- Install check of class-wide preconditions on the caller. |
| |
| function Is_Build_In_Place_Entity (E : Entity_Id) return Boolean; |
| -- Ada 2005 (AI-318-02): Returns True if E is a BIP entity. |
| |
| function Is_Build_In_Place_Result_Type (Typ : Entity_Id) return Boolean; |
| -- Ada 2005 (AI-318-02): Returns True if functions returning the type use |
| -- build-in-place protocols. For inherently limited types, this must be |
| -- True in >= Ada 2005, and must be False in Ada 95. For other types, it |
| -- can be True or False, and the decision should be based on efficiency, |
| -- and should be the same for all language versions, so that mixed-dialect |
| -- programs will work. |
| -- |
| -- For inherently limited types in Ada 2005, True means that calls will |
| -- actually be build-in-place in all cases. For other types, build-in-place |
| -- will be used when possible, but we need to make a copy in some |
| -- cases. For example, for "X := F(...);" if F can see X, or if F can |
| -- propagate exceptions, we need to store its result in a temp in general, |
| -- and copy the temp into X. Also, for "return Global_Var;" Global_Var |
| -- needs to be copied into the function result object. |
| |
| function Is_Build_In_Place_Function (E : Entity_Id) return Boolean; |
| -- Ada 2005 (AI-318-02): Returns True if E denotes a function, generic |
| -- function, or access-to-function type for which |
| -- Is_Build_In_Place_Result_Type is True. However, we never use |
| -- build-in-place if the convention is other than Ada, because that would |
| -- disturb mixed-language programs. |
| |
| function Is_Build_In_Place_Function_Call (N : Node_Id) return Boolean; |
| -- Ada 2005 (AI-318-02): Returns True if N denotes a call to a function |
| -- that requires handling as a build-in-place call (possibly qualified or |
| -- converted). |
| |
| function Is_Null_Procedure (Subp : Entity_Id) return Boolean; |
| -- Predicate to recognize stubbed procedures and null procedures, which |
| -- can be inlined unconditionally in all cases. |
| |
| procedure Make_Build_In_Place_Call_In_Allocator |
| (Allocator : Node_Id; |
| Function_Call : Node_Id); |
| -- Ada 2005 (AI-318-02): Handle a call to a build-in-place function that |
| -- occurs as the expression initializing an allocator, by passing access |
| -- to the allocated object as an additional parameter of the function call. |
| -- A new access object is declared that is initialized to the result of the |
| -- allocator, passed to the function, and the allocator is rewritten to |
| -- refer to that access object. Function_Call must denote either an |
| -- N_Function_Call node for which Is_Build_In_Place_Call is True, or else |
| -- an N_Qualified_Expression node applied to such a function call. |
| |
| procedure Make_Build_In_Place_Call_In_Anonymous_Context |
| (Function_Call : Node_Id); |
| -- Ada 2005 (AI-318-02): Handle a call to a build-in-place function that |
| -- occurs in a context that does not provide a separate object. A temporary |
| -- object is created to act as the return object and an access to the |
| -- temporary is passed as an additional parameter of the call. This occurs |
| -- in contexts such as subprogram call actuals and object renamings. |
| -- Function_Call must denote either an N_Function_Call node for which |
| -- Is_Build_In_Place_Call is True, or else an N_Qualified_Expression node |
| -- applied to such a function call. |
| |
| procedure Make_Build_In_Place_Call_In_Assignment |
| (Assign : Node_Id; |
| Function_Call : Node_Id); |
| -- Ada 2005 (AI-318-02): Handle a call to a build-in-place function that |
| -- occurs as the right-hand side of an assignment statement by passing |
| -- access to the left-hand side as an additional parameter of the function |
| -- call. Assign must denote a N_Assignment_Statement. Function_Call must |
| -- denote either an N_Function_Call node for which Is_Build_In_Place_Call |
| -- is True, or an N_Qualified_Expression node applied to such a function |
| -- call. |
| |
| procedure Make_Build_In_Place_Call_In_Object_Declaration |
| (Obj_Decl : Node_Id; |
| Function_Call : Node_Id); |
| -- Ada 2005 (AI-318-02): Handle a call to a build-in-place function that |
| -- occurs as the expression initializing an object declaration by |
| -- passing access to the declared object as an additional parameter of the |
| -- function call. Function_Call must denote either an N_Function_Call node |
| -- for which Is_Build_In_Place_Call is True, or an N_Qualified_Expression |
| -- node applied to such a function call. |
| |
| procedure Make_Build_In_Place_Iface_Call_In_Allocator |
| (Allocator : Node_Id; |
| Function_Call : Node_Id); |
| -- Ada 2005 (AI-318-02): Handle a call to a build-in-place function that |
| -- occurs as the expression initializing an allocator, by passing access |
| -- to the allocated object as an additional parameter of the function call. |
| -- Function_Call must denote an expression containing a BIP function call |
| -- and an enclosing call to Ada.Tags.Displace to displace the pointer to |
| -- the returned BIP object to reference the secondary dispatch table of |
| -- an interface. |
| |
| procedure Make_Build_In_Place_Iface_Call_In_Anonymous_Context |
| (Function_Call : Node_Id); |
| -- Ada 2005 (AI-318-02): Handle a call to a build-in-place function that |
| -- occurs in a context that does not provide a separate object. A temporary |
| -- object is created to act as the return object and an access to the |
| -- temporary is passed as an additional parameter of the call. This occurs |
| -- in contexts such as subprogram call actuals and object renamings. |
| -- Function_Call must denote an expression containing a BIP function call |
| -- and an enclosing call to Ada.Tags.Displace to displace the pointer to |
| -- the returned BIP object to reference the secondary dispatch table of |
| -- an interface. |
| |
| procedure Make_Build_In_Place_Iface_Call_In_Object_Declaration |
| (Obj_Decl : Node_Id; |
| Function_Call : Node_Id); |
| -- Ada 2005 (AI-318-02): Handle a call to a build-in-place function that |
| -- occurs as the expression initializing an object declaration by passing |
| -- access to the declared object as an additional parameter of the function |
| -- call. Function_Call must denote an expression containing a BIP function |
| -- call and an enclosing call to Ada.Tags.Displace to displace the pointer |
| -- to the returned BIP object to reference the secondary dispatch table of |
| -- an interface. |
| |
| procedure Make_CPP_Constructor_Call_In_Allocator |
| (Allocator : Node_Id; |
| Function_Call : Node_Id); |
| -- Handle a call to a CPP constructor that occurs as the expression that |
| -- initializes an allocator, by passing access to the allocated object as |
| -- an additional parameter of the constructor call. A new access object is |
| -- declared that is initialized to the result of the allocator, passed to |
| -- the constructor, and the allocator is rewritten to refer to that access |
| -- object. Function_Call must denote a call to a CPP_Constructor function. |
| |
| function Might_Have_Tasks (Typ : Entity_Id) return Boolean; |
| -- Return True when type Typ has tasks or when it is a limited class-wide |
| -- type (or subtype), since it might have task components. |
| |
| function Needs_BIP_Alloc_Form (Func_Id : Entity_Id) return Boolean; |
| -- Ada 2005 (AI-318-02): Return True if the function needs an implicit |
| -- BIP_Alloc_Form parameter (see type BIP_Formal_Kind). |
| |
| function Needs_BIP_Finalization_Master (Func_Id : Entity_Id) return Boolean; |
| -- Ada 2005 (AI-318-02): Return True if the result subtype of function |
| -- Func_Id might need finalization actions. This includes build-in-place |
| -- functions with tagged result types, since they can be invoked via |
| -- dispatching calls, and descendant types may require finalization. |
| |
| function Needs_BIP_Task_Actuals (Func_Id : Entity_Id) return Boolean; |
| -- Return True if the function returns an object of a type that has tasks. |
| |
| function Unqual_BIP_Iface_Function_Call (Expr : Node_Id) return Node_Id; |
| -- Return the inner BIP function call removing any qualification from Expr |
| -- including qualified expressions, type conversions, references, unchecked |
| -- conversions and calls to displace the pointer to the object, if Expr is |
| -- an expression containing a call displacing the pointer to the BIP object |
| -- to reference the secondary dispatch table of an interface; otherwise |
| -- return Empty. |
| |
| end Exp_Ch6; |
