| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- E X P _ C H 6 -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 1992-2012, 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_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_Actuals (N : Node_Id; Subp : Entity_Id); |
| -- For each actual of an in-out or out parameter which is a numeric |
| -- (view) conversion of the form T (A), where A denotes a variable, |
| -- we insert the declaration: |
| -- |
| -- Temp : T[ := T (A)]; |
| -- |
| -- prior to the call. Then we replace the actual with a reference to Temp, |
| -- and append the assignment: |
| -- |
| -- A := TypeA (Temp); |
| -- |
| -- after the call. Here TypeA is the actual type of variable A. For out |
| -- parameters, the initial declaration has no expression. If A is not an |
| -- entity name, we generate instead: |
| -- |
| -- Var : TypeA renames A; |
| -- Temp : T := Var; -- omitting expression for out parameter. |
| -- ... |
| -- Var := TypeA (Temp); |
| -- |
| -- For other in-out parameters, we emit the required constraint checks |
| -- before and/or after the call. |
| -- |
| -- For all parameter modes, actuals that denote components and slices of |
| -- packed arrays are expanded into suitable temporaries. |
| -- |
| -- For non-scalar objects that are possibly unaligned, add call by copy |
| -- code (copy in for IN and IN OUT, copy out for OUT and IN OUT). |
| |
| 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. |
| |
| 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 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 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 whose result must be built in |
| -- place; otherwise returns False. For Ada 2005, this is currently |
| -- restricted to the set of functions whose result subtype is an inherently |
| -- limited type. In Ada 95, this must be False for inherently limited |
| -- result types (but currently returns False for all Ada 95 functions). |
| -- Eventually we plan to support build-in-place for nonlimited types. |
| -- Build-in-place is usually more efficient for large things, and less |
| -- efficient for small things. However, we never use build-in-place if the |
| -- convention is other than Ada, because that would disturb mixed-language |
| -- programs. Note that for the non-inherently-limited cases, we must make |
| -- the same decision for Ada 95 and 2005, so that mixed-dialect programs |
| -- will work. |
| |
| 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 or is a qualified |
| -- expression applied to such a call; otherwise returns False. |
| |
| 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 List_Inlining_Info; |
| -- Generate listing of calls inlined by the frontend plus listing of |
| -- calls to inline subprograms passed to the backend. |
| |
| 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 |
| (Object_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_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 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 needs finalization actions. |
| |
| function Needs_Result_Accessibility_Level |
| (Func_Id : Entity_Id) return Boolean; |
| -- Ada 2012 (AI05-0234): Return True if the function needs an implicit |
| -- parameter to identify the accessibility level of the function result |
| -- "determined by the point of call". |
| |
| 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. |
| |
| end Exp_Ch6; |
