1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- B A C K _ E N D -- 6-- -- 7-- S p e c -- 8-- -- 9-- Copyright (C) 1992-2019, 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 3, 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 COPYING3. If not, go to -- 19-- http://www.gnu.org/licenses for a complete copy of the license. -- 20-- -- 21-- GNAT was originally developed by the GNAT team at New York University. -- 22-- Extensive contributions were provided by Ada Core Technologies Inc. -- 23-- -- 24------------------------------------------------------------------------------ 25 26-- Call the back end with all the information needed 27 28-- Note: there are multiple bodies/variants of this package, so do not 29-- modify this spec without coordination. 30 31package Back_End is 32 33 type Back_End_Mode_Type is ( 34 Generate_Object, 35 -- Full back end operation with object file generation 36 37 Declarations_Only, 38 -- Partial back end operation with no object file generation. In this 39 -- mode the only useful action performed by gigi is to process all 40 -- declarations issuing any error messages (in particular those to 41 -- do with rep clauses), and to back annotate representation info. 42 43 Skip); 44 -- Back end call is skipped (syntax only, or errors found) 45 46 pragma Convention (C, Back_End_Mode_Type); 47 for Back_End_Mode_Type use (0, 1, 2); 48 49 procedure Call_Back_End (Mode : Back_End_Mode_Type); 50 -- Call back end, i.e. make call to driver traversing the tree and 51 -- outputting code. This call is made with all tables locked. The back 52 -- end is responsible for unlocking any tables it may need to change, 53 -- and locking them again before returning. 54 55 procedure Scan_Compiler_Arguments; 56 -- Acquires command-line parameters passed to the compiler and processes 57 -- them. Calls Scan_Front_End_Switches for any front-end switches found. 58 -- 59 -- The processing of arguments is private to the back end, since the way 60 -- of acquiring the arguments as well as the set of allowable back end 61 -- switches is different depending on the particular back end being used. 62 -- 63 -- Any processed switches that influence the result of a compilation must 64 -- be added to the Compilation_Arguments table. 65 -- 66 -- This routine is expected to set the following to True if necessary (the 67 -- default for all of these in Opt is False). 68 -- 69 -- Opt.Disable_FE_Inline 70 -- Opt.Disable_FE_Inline_Always 71 -- Opt.Suppress_Control_Float_Optimizations 72 -- Opt.Generate_SCO 73 -- Opt.Generate_SCO_Instance_Table 74 -- Opt.Stack_Checking_Enabled 75 -- Opt.No_Stdinc 76 -- Opt.No_Stdlib 77 78 procedure Gen_Or_Update_Object_File; 79 -- Is used to generate the object file (if generated directly by gnat1), or 80 -- update it if it has already been generated by the call to Call_Back_End, 81 -- so that its timestamp is updated by the call. 82 -- 83 -- This is a no-op with the gcc back-end (the object file is generated by 84 -- the assembler afterwards), but is needed for back-ends that directly 85 -- generate the final object file so that the object file's timestamp is 86 -- correct when compared with the corresponding ali file by gnatmake. 87 88end Back_End; 89