Sail configuration system

This commit introduces a method for configuring Sail models using
a JSON configuration file. It introduces a new construct into the language:
```
config a.b.c : T
```
which gets the value of the json object a.b.c in the configuration file
and interprets it as the Sail type T

Configuration options can be instantiated at compile time using
```
sail --config c.json <files>
```
which is useful for Sail targets like SMT or SystemVerilog, or
they can be accessed at runtime, which allows for building a configurable emulator

THIRD_PARTY_FILES.md

@@ -14,6 +14,13 @@ https://github.com/asciidoctor/asciidoctor
 | ------------ | ----------------------- | ----------- |
 | MIT          | doc/asciidoc/manual.css | Asciidoctor |
 
+The following files are from cJSON https://github.com/DaveGamble/cJSON
+
+| License      | Files                   | Source |
+| ------------ | ----------------------- | ------ |
+| MIT          | lib/json/cJSON.c       | cJSON  |
+| MIT          | lib/json/cJSON.h       | cJSON  |
+
 CIL
 ===
 
@@ -113,3 +120,28 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ```
+
+cJSON
+=====
+
+```
+Copyright (c) 2009-2017 Dave Gamble and cJSON contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+```

editors/sail-mode.el

@@ -32,7 +32,7 @@
 
 (defconst sail-keywords
   '("val" "outcome" "function" "type" "struct" "union" "enum" "let" "var" "if" "then" "by"
-    "else" "match" "in" "return" "register" "ref" "forall" "operator" "effect"
+    "else" "match" "in" "return" "register" "ref" "forall" "operator" "effect" "config"
     "overload" "cast" "sizeof" "constant" "constraint" "default" "assert" "newtype" "from"
     "pure" "impure" "monadic" "infixl" "infixr" "infix" "scattered" "end" "try" "catch" "and" "to" "private"
     "throw" "clause" "as" "repeat" "until" "while" "do" "foreach" "bitfield"

language/jib.ott

@@ -138,6 +138,7 @@ cval :: 'V_' ::=
   | cval nat0 nat1                                  :: :: tuple_member
   | op ( cval0 , ... , cvaln )                      :: :: call
   | cval . id                                       :: :: field
+  | string0 . ... . stringn                         :: :: config_key
 
 % Note that init / clear are sometimes referred to as create / kill
 
@@ -196,6 +197,8 @@ ctyp :: 'CT_' ::=
   | poly kid                :: :: poly
 
   | memory_writes           :: :: memory_writes
+% Used for configuration, an immutable reference to some json data
+  | json                    :: :: json
 
 clexp :: 'CL_' ::=
   | name : ctyp              :: :: id

language/sail.ott

@@ -455,8 +455,8 @@ grammar
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 loop :: loop ::= {{ phantom }}
-  | while ::   :: while
-  | until ::  :: until
+  | while :: :: while
+  | until :: :: until
 
 internal_loop_measure :: 'Measure_' ::=
   {{ com internal syntax for an optional termination measure for a loop }}
@@ -516,8 +516,10 @@ exp :: 'E_' ::=
     {{ com the value of $[[nexp]]$ at run time }}
 
   | return exp                                        :: :: return {{ com  return $[[exp]]$ from current function }}
-  | exit exp                                          :: :: exit
-    {{ com halt all current execution }}
+  | exit exp                                          :: :: exit {{ com halt all current execution }}
+
+  | config string1 . ... . stringn                    :: :: config {{ com model configuration value }}
+
   | ref id                                            :: :: ref
   | throw exp                                         :: :: throw
   | try exp catch { pexp1 , ... , pexpn }             :: :: try

lib/json/LICENSE

@@ -0,0 +1,20 @@
+Copyright (c) 2009-2017 Dave Gamble and cJSON contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+