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------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- E X P _ C H 6 -- -- -- -- S p e c -- -- -- -- Copyright (C) 1992-2011, Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 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 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. 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;
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