G-Compiler is a compiler written in C/C that is able to compile a OCaml-syntax-like functional programming language with state, named G. You can find grammar for G here. G-compiler also supports translating the G program into intermediate C program (see C-Translation for detail).
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Mac OS
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UNIX (not yet)
Usage: ./build/compiler [-h|--help] [-l|--length]
[-f|--filename <filename>]
[-t|--translate <filename>]
[-L|--lex] [-P|--PARSE] [-p|--parse] [-s|--step]
NOTE:[-f|--filename <filename>] has to present to take the input file
Available flags:
* -f --file <filename> take one argument as the filename of the input
* -t --translate <filename> translate the original program into a C program, saved in file <filename>
* -p --parse generate the abstract syntax tree from parsing
- This is the only option that will stop the compiler from interpreting the output
* -P --PARSE generate EXTREMELY verbose parsing stages (Debug use only)
* -L --lex generate the tokens and matching rules in .l file
* -l --length prints the lengths of each of the arguments
* -s --step prints the intermediate step of each evaluation
* -h --help prints the help message
You need to install both bison (version >= 3.0.4) and flex (version >= 2.6.4).
- Bison:
brew install bison - Flex:
brew install flex
make all
make test
If there are errors present, you can find the error in ./test/diff.txt
make clean
With the flag -t <filename>, G-compiler is able to translate the G program into a C program. Now it supports translating binary operations, if expressions, let bindings and functional applications into a C program. You can then use either gcc or clang to compile the C program as normal. See Example sections for more info.
More translating features are still under development.
See directory ./test for examples.
./test/exp_testare examples(tests) for G program./test/type_testare examples(tests) for checking type errors in G program./test/translate_testare examples(tests) for translating G programs into C programs
#include <filename>
prog:
decllist eof
formal:
var : typ
formallist:
formal
| formallist , formal
decl:
let var ( formallist ) : typ = exp ;;
decllist:
decl
| decllist decl
exp:
exp_app
exp_app:
var expslist
| exp_ops
expslist:
exp_ops
| expslist exp_ops
exp_ops:
exp_ops exp_ops
| exp_ops - exp_ops
| exp_ops * exp_ops
| exp_ops / exp_ops
| exp_ops <= exp_ops
| exp_ops < exp_ops
| exp_ops == exp_ops
| exp_ops > exp_ops
| exp_ops >= exp_ops
| ( exp_ops , exp_ops )
| fst ( exp_ops )
| snd ( exp_ops )
| car ( exp_ops )
| cdr ( exp_ops )
| empty ( exp_ops )
| exp_ops :: exp_ops
| { } : typ
| ref ( exp_ops )
| ! ( exp_ops )
| exp_ops := exp_ops
| exp_ops ; exp_ops
| ( exp_ops ) %prec ->
| typ var = { exp_ops }
| struct { struct_statement_list }
| exp_ops . var
| exp_base
exp_base:
( )
| int
| double
| true
| false
| NaN
| var
| if exp then exp else exp
| let var : typ = exp in exp
| while exp do exp end
| ( exp )
struct_statement_list: struct_statement
| struct_statement_list struct_statement
struct_statement:
typ var => exp
typ:
int
| float
| bool
| unit
| struct
| typ -> typ
| typ * typ
| { typ }
| < typ >
| ( typ )
1. ( ) left associative
2. . left associative
3. * / left associative
4. - left associative
5. <= < > >= == left associative
6. -> :: right associative
7. if then else
8. := left associative
9. ; left associative
10. ! ref right associative
When it’s 3 A.M., and you’ve been debugging for 12 hours, and you encounter a virtual static friend protected volatile templated function pointer, you want to go into hibernation and awake as a werewolf and then find the people who wrote the C standard and bring ruin to the things that they love. The C STL, with its dyslexia-inducing syntax blizzard of colons and angle brackets, guarantees that if you try to declare any reasonable data structure, your first seven attempts will result in compiler errors of Wagnerian fierceness:
Syntax error: unmatched thing in thing from std::nonstd::__ map<_Cyrillic, _$$$dollars>const basic_string< epic_ mystery,mongoose_traits < char>, __default_alloc_<casual_ Fridays = maybe>>From James Mickens' The Night Watch
Garrett Wang
Peter-Michael Osera