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|---|---|---|
| 70482933 RK |
1 | ------------------------------------------------------------------------------ |
| 2 | -- -- | |
| 3 | -- GNAT COMPILER COMPONENTS -- | |
| 4 | -- -- | |
| 5 | -- E X P _ C H 1 1 -- | |
| 6 | -- -- | |
| 7 | -- S p e c -- | |
| 8 | -- -- | |
| 70482933 RK |
9 | -- Copyright (C) 1992-2000 Free Software Foundation, Inc. -- |
| 10 | -- -- | |
| 11 | -- GNAT is free software; you can redistribute it and/or modify it under -- | |
| 12 | -- terms of the GNU General Public License as published by the Free Soft- -- | |
| 13 | -- ware Foundation; either version 2, or (at your option) any later ver- -- | |
| 14 | -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- | |
| 15 | -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
| 16 | -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- | |
| 17 | -- for more details. You should have received a copy of the GNU General -- | |
| 18 | -- Public License distributed with GNAT; see file COPYING. If not, write -- | |
| 19 | -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- | |
| 20 | -- MA 02111-1307, USA. -- | |
| 21 | -- -- | |
| 22 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 71ff80dc | 23 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| 70482933 RK |
24 | -- -- |
| 25 | ------------------------------------------------------------------------------ | |
| 26 | ||
| 27 | -- Expand routines for chapter 11 constructs | |
| 28 | ||
| 29 | with Types; use Types; | |
| 30 | ||
| 31 | package Exp_Ch11 is | |
| 32 | procedure Expand_N_Exception_Declaration (N : Node_Id); | |
| 33 | procedure Expand_N_Handled_Sequence_Of_Statements (N : Node_Id); | |
| 34 | procedure Expand_N_Raise_Constraint_Error (N : Node_Id); | |
| 35 | procedure Expand_N_Raise_Program_Error (N : Node_Id); | |
| 36 | procedure Expand_N_Raise_Statement (N : Node_Id); | |
| 37 | procedure Expand_N_Raise_Storage_Error (N : Node_Id); | |
| 38 | procedure Expand_N_Subprogram_Info (N : Node_Id); | |
| 39 | ||
| 40 | -- Data structures for gathering information to build exception tables | |
| 41 | -- See runtime routine Ada.Exceptions for full details on the format and | |
| 42 | -- content of these tables. | |
| 43 | ||
| 44 | procedure Initialize; | |
| 45 | -- Initializes these data structures for a new main unit file | |
| 46 | ||
| 47 | procedure Expand_At_End_Handler (HSS : Node_Id; Block : Node_Id); | |
| 48 | -- Given a handled statement sequence, HSS, for which the At_End_Proc | |
| 49 | -- field is set, and which currently has no exception handlers, this | |
| 50 | -- procedure expands the special exception handler required. | |
| 51 | -- This procedure also create a new scope for the given Block, if | |
| 52 | -- Block is not Empty. | |
| 53 | ||
| 54 | procedure Expand_Exception_Handlers (HSS : Node_Id); | |
| 55 | -- This procedure expands exception handlers, and is called as part | |
| 56 | -- of the processing for Expand_N_Handled_Sequence_Of_Statements and | |
| 57 | -- is also called from Expand_At_End_Handler. N is the handled sequence | |
| 58 | -- of statements that has the exception handler(s) to be expanded. This | |
| 59 | -- is also called to expand the special exception handler built for | |
| 60 | -- accept bodies (see Exp_Ch9.Build_Accept_Body). | |
| 61 | ||
| 62 | procedure Generate_Unit_Exception_Table; | |
| 63 | -- Procedure called by main driver to generate unit exception table if | |
| 64 | -- zero cost exceptions are enabled. See System.Exceptions for details. | |
| 65 | ||
| 66 | function Is_Non_Ada_Error (E : Entity_Id) return Boolean; | |
| 67 | -- This function is provided for Gigi use. It returns True if operating on | |
| 68 | -- VMS, and the argument E is the entity for System.Aux_Dec.Non_Ada_Error. | |
| 69 | -- This is used to generate the special matching code for this exception. | |
| 70 | ||
| 71 | procedure Remove_Handler_Entries (N : Node_Id); | |
| 72 | -- This procedure is called when optimization circuits determine that | |
| 73 | -- an entire subtree can be removed. If the subtree contains handler | |
| 74 | -- entries in zero cost exception mode, then such removal can lead to | |
| 75 | -- dangling references to non-existent handlers in the handler table. | |
| 76 | -- This procedure removes such references. | |
| 77 | ||
| 78 | -------------------------------------- | |
| 79 | -- Subprogram_Descriptor Generation -- | |
| 80 | -------------------------------------- | |
| 81 | ||
| 82 | -- Subprogram descriptors are required for all subprograms, including | |
| 83 | -- explicit subprograms defined in the program, subprograms that are | |
| 84 | -- imported via pragma Import, and also for the implicit elaboration | |
| 85 | -- subprograms used to elaborate package specs and bodies. | |
| 86 | ||
| 87 | procedure Generate_Subprogram_Descriptor_For_Package | |
| 88 | (N : Node_Id; | |
| 89 | Spec : Entity_Id); | |
| 90 | -- This is used to create a descriptor for the implicit elaboration | |
| 91 | -- procedure for a package spec of body. The compiler only generates | |
| 92 | -- such descriptors if the package spec or body contains exception | |
| 93 | -- handlers (either explicitly in the case of a body, or from generic | |
| 94 | -- package instantiations). N is the node for the package body or | |
| 95 | -- spec, and Spec is the package body or package entity respectively. | |
| 96 | -- N must be a compilation unit, and the descriptor is placed at | |
| 97 | -- the end of the actions for the auxiliary compilation unit node. | |
| 98 | ||
| 99 | procedure Generate_Subprogram_Descriptor_For_Subprogram | |
| 100 | (N : Node_Id; | |
| 101 | Spec : Entity_Id); | |
| 102 | -- This is used to create a desriptor for a subprogram, both those | |
| 103 | -- present in the source, and those implicitly generated by code | |
| 104 | -- expansion. N is the subprogram body node, and Spec is the entity | |
| 105 | -- for the subprogram. The descriptor is placed at the end of the | |
| 106 | -- Last exception handler, or, if there are no handlers, at the end | |
| 107 | -- of the statement sequence. | |
| 108 | ||
| 109 | procedure Generate_Subprogram_Descriptor_For_Imported_Subprogram | |
| 110 | (Spec : Entity_Id; | |
| 111 | Slist : List_Id); | |
| 112 | -- This is used to create a descriptor for an imported subprogram. | |
| 113 | -- Such descriptors are needed for propagation of exceptions through | |
| 114 | -- such subprograms. The descriptor never references any handlers, | |
| 115 | -- and is appended to the given Slist. | |
| 116 | ||
| 117 | end Exp_Ch11; |