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[official-gcc.git] / gcc / ada / back_end.ads
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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) 1992-2018, 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 ------------------------------------------------------------------------------
26 -- Call the back end with all the information needed
28 -- Note: there are multiple bodies/variants of this package, so do not
29 -- modify this spec without coordination.
31 package Back_End is
33 type Back_End_Mode_Type is (
34 Generate_Object,
35 -- Full back end operation with object file generation
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.
43 Skip);
44 -- Back end call is skipped (syntax only, or errors found)
46 pragma Convention (C, Back_End_Mode_Type);
47 for Back_End_Mode_Type use (0, 1, 2);
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.
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.
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.
63 -- Any processed switches that influence the result of a compilation must
64 -- be added to the Compilation_Arguments table.
66 -- This routine is expected to set the following to True if necessary (the
67 -- default for all of these in Opt is False).
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
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.
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.
88 end Back_End;