505 lines
15 KiB
Ada
505 lines
15 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- G E T _ S C O S --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 2009-2020, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING3. If not, go to --
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-- http://www.gnu.org/licenses for a complete copy of the license. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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pragma Ada_2005;
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-- This unit is not part of the compiler proper, it is used in tools that
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-- read SCO information from ALI files (Xcov and sco_test). Ada 2005
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-- constructs may therefore be used freely (and are indeed).
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with Namet; use Namet;
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with SCOs; use SCOs;
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with Types; use Types;
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with Ada.IO_Exceptions; use Ada.IO_Exceptions;
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procedure Get_SCOs is
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Dnum : Nat;
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C : Character;
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Loc1 : Source_Location;
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Loc2 : Source_Location;
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Cond : Character;
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Dtyp : Character;
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use ASCII;
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-- For CR/LF
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function At_EOL return Boolean;
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-- Skips any spaces, then checks if we are the end of a line. If so,
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-- returns True (but does not skip over the EOL sequence). If not,
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-- then returns False.
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procedure Check (C : Character);
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-- Checks that file is positioned at given character, and if so skips past
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-- it, If not, raises Data_Error.
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function Get_Int return Int;
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-- On entry the file is positioned to a digit. On return, the file is
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-- positioned past the last digit, and the returned result is the decimal
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-- value read. Data_Error is raised for overflow (value greater than
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-- Int'Last), or if the initial character is not a digit.
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procedure Get_Source_Location (Loc : out Source_Location);
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-- Reads a source location in the form line:col and places the source
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-- location in Loc. Raises Data_Error if the format does not match this
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-- requirement. Note that initial spaces are not skipped.
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procedure Get_Source_Location_Range (Loc1, Loc2 : out Source_Location);
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-- Skips initial spaces, then reads a source location range in the form
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-- line:col-line:col and places the two source locations in Loc1 and Loc2.
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-- Raises Data_Error if format does not match this requirement.
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procedure Skip_EOL;
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-- Called with the current character about to be read being LF or CR. Skips
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-- past CR/LF characters until either a non-CR/LF character is found, or
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-- the end of file is encountered.
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procedure Skip_Spaces;
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-- Skips zero or more spaces at the current position, leaving the file
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-- positioned at the first non-blank character (or Types.EOF).
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------------
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-- At_EOL --
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------------
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function At_EOL return Boolean is
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begin
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Skip_Spaces;
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return Nextc = CR or else Nextc = LF;
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end At_EOL;
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-----------
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-- Check --
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-----------
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procedure Check (C : Character) is
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begin
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if Nextc = C then
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Skipc;
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else
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raise Data_Error;
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end if;
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end Check;
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-------------
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-- Get_Int --
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-------------
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function Get_Int return Int is
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Val : Int;
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C : Character;
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begin
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C := Nextc;
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Val := 0;
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if C not in '0' .. '9' then
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raise Data_Error;
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end if;
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-- Loop to read digits of integer value
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loop
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declare
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pragma Unsuppress (Overflow_Check);
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begin
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Val := Val * 10 + (Character'Pos (C) - Character'Pos ('0'));
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end;
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Skipc;
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C := Nextc;
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exit when C not in '0' .. '9';
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end loop;
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return Val;
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exception
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when Constraint_Error =>
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raise Data_Error;
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end Get_Int;
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-------------------------
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-- Get_Source_Location --
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-------------------------
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procedure Get_Source_Location (Loc : out Source_Location) is
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pragma Unsuppress (Range_Check);
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begin
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Loc.Line := Logical_Line_Number (Get_Int);
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Check (':');
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Loc.Col := Column_Number (Get_Int);
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exception
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when Constraint_Error =>
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raise Data_Error;
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end Get_Source_Location;
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-------------------------------
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-- Get_Source_Location_Range --
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-------------------------------
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procedure Get_Source_Location_Range (Loc1, Loc2 : out Source_Location) is
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begin
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Skip_Spaces;
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Get_Source_Location (Loc1);
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Check ('-');
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Get_Source_Location (Loc2);
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end Get_Source_Location_Range;
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--------------
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-- Skip_EOL --
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--------------
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procedure Skip_EOL is
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C : Character;
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begin
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loop
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Skipc;
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C := Nextc;
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exit when C /= LF and then C /= CR;
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end loop;
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end Skip_EOL;
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-----------------
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-- Skip_Spaces --
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-----------------
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procedure Skip_Spaces is
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begin
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while Nextc = ' ' loop
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Skipc;
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end loop;
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end Skip_Spaces;
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Buf : String (1 .. 32_768);
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N : Natural;
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-- Scratch buffer, and index into it
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Nam : Name_Id;
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-- Start of processing for Get_SCOs
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begin
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SCOs.Initialize;
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-- Loop through lines of SCO information
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while Nextc = 'C' loop
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Skipc;
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C := Getc;
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-- Make sure first line is a header line
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if SCO_Unit_Table.Last = 0 and then C /= ' ' then
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raise Data_Error;
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end if;
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-- Otherwise dispatch on type of line
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case C is
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-- Header or instance table entry
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when ' ' =>
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-- Complete previous entry if any
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if SCO_Unit_Table.Last /= 0 then
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SCO_Unit_Table.Table (SCO_Unit_Table.Last).To :=
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SCO_Table.Last;
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end if;
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Skip_Spaces;
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case Nextc is
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-- Instance table entry
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when 'i' =>
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declare
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Inum : SCO_Instance_Index;
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begin
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Skipc;
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Skip_Spaces;
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Inum := SCO_Instance_Index (Get_Int);
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SCO_Instance_Table.Increment_Last;
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pragma Assert (SCO_Instance_Table.Last = Inum);
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Skip_Spaces;
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declare
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SIE : SCO_Instance_Table_Entry
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renames SCO_Instance_Table.Table (Inum);
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begin
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SIE.Inst_Dep_Num := Get_Int;
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C := Getc;
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pragma Assert (C = '|');
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Get_Source_Location (SIE.Inst_Loc);
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if At_EOL then
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SIE.Enclosing_Instance := 0;
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else
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Skip_Spaces;
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SIE.Enclosing_Instance :=
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SCO_Instance_Index (Get_Int);
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pragma Assert (SIE.Enclosing_Instance in
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SCO_Instance_Table.First
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.. SCO_Instance_Table.Last);
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end if;
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end;
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end;
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-- Unit header
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when '0' .. '9' =>
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-- Scan out dependency number and file name
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Dnum := Get_Int;
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Skip_Spaces;
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N := 0;
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while Nextc > ' ' loop
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N := N + 1;
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Buf (N) := Getc;
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end loop;
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-- Make new unit table entry (will fill in To later)
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SCO_Unit_Table.Append (
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(File_Name => new String'(Buf (1 .. N)),
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File_Index => 0,
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Dep_Num => Dnum,
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From => SCO_Table.Last + 1,
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To => 0));
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when others =>
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raise Program_Error;
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end case;
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-- Statement entry
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when 'S' | 's' =>
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declare
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Typ : Character;
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Key : Character;
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begin
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Key := 'S';
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-- If continuation, reset Last indication in last entry stored
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-- for previous CS or cs line.
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if C = 's' then
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SCO_Table.Table (SCO_Table.Last).Last := False;
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end if;
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-- Initialize to scan items on one line
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Skip_Spaces;
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-- Loop through items on one line
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loop
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Nam := No_Name;
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Typ := Nextc;
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case Typ is
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when '>' =>
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-- Dominance marker may be present only at entry point
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pragma Assert (Key = 'S');
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Skipc;
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Key := '>';
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Typ := Getc;
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-- Sanity check on dominance marker type indication
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pragma Assert (Typ in 'A' .. 'Z');
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when '1' .. '9' =>
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Typ := ' ';
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when others =>
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Skipc;
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if Typ = 'P' or else Typ = 'p' then
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if Nextc not in '1' .. '9' then
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Name_Len := 0;
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loop
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Name_Len := Name_Len + 1;
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Name_Buffer (Name_Len) := Getc;
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exit when Nextc = ':';
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end loop;
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Skipc; -- Past ':'
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Nam := Name_Find;
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end if;
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end if;
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end case;
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if Key = '>' and then Typ /= 'E' then
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Get_Source_Location (Loc1);
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Loc2 := No_Source_Location;
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else
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Get_Source_Location_Range (Loc1, Loc2);
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end if;
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SCO_Table.Append
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((C1 => Key,
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C2 => Typ,
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From => Loc1,
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To => Loc2,
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Last => At_EOL,
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Pragma_Sloc => No_Location,
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Pragma_Aspect_Name => Nam));
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if Key = '>' then
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Key := 'S';
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end if;
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exit when At_EOL;
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end loop;
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end;
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-- Decision entry
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when 'E' | 'G' | 'I' | 'P' | 'W' | 'X' | 'A' =>
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Dtyp := C;
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if C = 'A' then
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Name_Len := 0;
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while Nextc /= ' ' loop
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Name_Len := Name_Len + 1;
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Name_Buffer (Name_Len) := Getc;
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end loop;
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Nam := Name_Find;
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else
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Nam := No_Name;
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end if;
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Skip_Spaces;
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-- Output header
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declare
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Loc : Source_Location;
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begin
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-- Acquire location information
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if Dtyp = 'X' then
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Loc := No_Source_Location;
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else
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Get_Source_Location (Loc);
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end if;
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SCO_Table.Append
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((C1 => Dtyp,
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C2 => ' ',
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From => Loc,
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To => No_Source_Location,
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Last => False,
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Pragma_Aspect_Name => Nam,
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others => <>));
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end;
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-- Loop through terms in complex expression
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C := Nextc;
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while C /= CR and then C /= LF loop
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if C = 'c' or else C = 't' or else C = 'f' then
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Cond := C;
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Skipc;
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Get_Source_Location_Range (Loc1, Loc2);
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SCO_Table.Append
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((C2 => Cond,
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From => Loc1,
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To => Loc2,
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Last => False,
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others => <>));
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elsif C = '!' or else
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C = '&' or else
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C = '|'
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then
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Skipc;
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declare
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Loc : Source_Location;
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begin
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Get_Source_Location (Loc);
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SCO_Table.Append
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((C1 => C,
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From => Loc,
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Last => False,
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others => <>));
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end;
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elsif C = ' ' then
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Skip_Spaces;
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elsif C = 'T' or else C = 'F' then
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-- Chaining indicator: skip for now???
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declare
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Loc1, Loc2 : Source_Location;
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pragma Unreferenced (Loc1, Loc2);
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begin
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Skipc;
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Get_Source_Location_Range (Loc1, Loc2);
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end;
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else
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raise Data_Error;
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end if;
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C := Nextc;
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end loop;
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-- Reset Last indication to True for last entry
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SCO_Table.Table (SCO_Table.Last).Last := True;
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-- No other SCO lines are possible
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when others =>
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raise Data_Error;
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end case;
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Skip_EOL;
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end loop;
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-- Here with all SCO's stored, complete last SCO Unit table entry
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SCO_Unit_Table.Table (SCO_Unit_Table.Last).To := SCO_Table.Last;
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end Get_SCOs;
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