diff options
Diffstat (limited to 'gcc-4.8/gcc/ada/exp_alfa.ads')
| -rw-r--r-- | gcc-4.8/gcc/ada/exp_alfa.ads | 86 |
1 files changed, 0 insertions, 86 deletions
diff --git a/gcc-4.8/gcc/ada/exp_alfa.ads b/gcc-4.8/gcc/ada/exp_alfa.ads deleted file mode 100644 index 7b67c8d3c..000000000 --- a/gcc-4.8/gcc/ada/exp_alfa.ads +++ /dev/null @@ -1,86 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT COMPILER COMPONENTS -- --- -- --- E X P _ A L F A -- --- -- --- S p e c -- --- -- --- Copyright (C) 2011-2012, 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. -- --- -- ------------------------------------------------------------------------------- - --- This package implements a light expansion which is used in formal --- verification mode (Alfa_Mode = True). Instead of a complete expansion --- of nodes for code generation, this Alfa expansion targets generation --- of intermediate code for formal verification. - --- Expand_Alfa is called directly by Expander.Expand. - --- Alfa expansion has three main objectives: - --- 1. Perform limited expansion to explicit some Ada rules and constructs --- (translate 'Old and 'Result, replace renamings by renamed, insert --- conversions, expand actuals in calls to introduce temporaries, expand --- generics instantiations) - --- 2. Facilitate treatment for the formal verification back-end (fully --- qualify names, expand set membership, compute data dependences) - --- 3. Avoid the introduction of low-level code that is difficult to analyze --- formally, as typically done in the full expansion for high-level --- constructs (tasking, dispatching) - --- To fulfill objective 1, Expand_Alfa selectively expands some constructs. - --- To fulfill objective 2, the tree after Alfa expansion should be fully --- analyzed semantically. In particular, all expression must have their proper --- type, and semantic links should be set between tree nodes (partial to full --- view, etc.) Some kinds of nodes should be either absent, or can be ignored --- by the formal verification backend: - --- N_Object_Renaming_Declaration: can be ignored safely --- N_Expression_Function: absent (rewitten) --- N_Expression_With_Actions: absent (not generated) - --- Alfa cross-references are generated from the regular cross-references (used --- for browsing and code understanding) and additional references collected --- during semantic analysis, in particular on all dereferences. These Alfa --- cross-references are output in a separate section of ALI files, as --- described in alfa.adb. They are the basis for the computation of data --- dependences in the formal verification backend. This implies that all --- cross-references should be generated in this mode, even those that would --- not make sense from a user point-of-view, and that cross-references that do --- not lead to data dependences for subprograms can be safely ignored. - --- To support the formal verification of units parameterized by data, the --- value of deferred constants should not be considered as a compile-time --- constant at program locations where the full view is not visible. - --- To fulfill objective 3, Expand_Alfa does not expand features that are not --- formally analyzed (tasking), or for which formal analysis relies on the --- source level representation (dispatching, aspects, pragmas). However, these --- should be semantically analyzed, which sometimes requires the insertion of --- semantic pre-analysis, for example for subprogram contracts and pragma --- check/assert. - -with Types; use Types; - -package Exp_Alfa is - - procedure Expand_Alfa (N : Node_Id); - -end Exp_Alfa; |