https://github.com/ozansz/v-lang-parser

https://github.com/ozansz/v-lang-parser

Last synced: 13 days ago
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• Host: GitHub
• URL: https://github.com/ozansz/v-lang-parser
• Owner: ozansz
• Created: 2019-11-30T12:02:07.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2019-11-30T12:02:47.000Z (almost 5 years ago)
• Last Synced: 2024-10-16T14:21:33.607Z (28 days ago)
• Language: Java
• Size: 1.26 MB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# V Lang Lexer & Parser

Parser and symbol table generator implementation for CENG444 Term Project #1 - V Language (by Cem Bozşahin).

## Usage 

* V Grammar is implemented in `V.g4`.

* Example test programs are under `tests/`.

* Pre-built parse trees for test programs are under `parse_trees/`.

* Pre-built symbol tables for test programs are under `symbol_tables/`.

**Note**: The test files and V Lang Test Suite can also be found at https://github.com/ozansz/v-lang-tester.

One who wants to re-generate symbol tables or generate symbol tables for **custom V programs** can run the commands below,

```bash

javac *.java

java VSymTabGenerator   # To generate symbol table

```

Also, to test correctness of the grammar, the below usage of `compile.sh` tests if the test programs can be parsed correctly,

```bash

chmod +x *.sh

./compile.sh

```

## Extras

### Multi-dimensional vectors

Example:

```

var x: int[5][2];

int func main()

    x[0][2] := 4;

endfunc

```

The test program `ext_1_matrix_transpose.v` tests functionality of this extension.

### Function call statements

Example:

```

var x: real;

real func dummy(i: int)

    x := i * 1E-3;

    return -45.3;

endfunc

int func main()

    var q: real;

    q := dummy(4);      % This was possible.

    dummy(4);           % This is also possible now.

endfunc

```

### Inline RISC-V assembly

RISC-V assembly is supported inside `_asm` and `_endasm` keywords. Local variables can also be used in LOAD and STORE instructions through the grammar `assembly_redirect: '<' ID '>';`.

Example:

```

int func bindSock(sockfd: int)

    var ret: int;

    _asm

        lw a0, ;

        li a1, 2;           % AF_INET = 2

        li a2, 0xd60b;      % port = 3030 (0xbd6 in hex)

        li a3, 0;           % INADDR_ANY = 0

        li a7, 200;         % __NR_bind = 200

        ecall;

        sw a0, ;

    _endasm;

    return ret;

endfunc

```

The test program `ext_2_socket.v` tests functionality of this extension by implementing a very basic socket server.