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  1. 1
      .gitattributes
  2. 36
      .gitignore
  3. 0
      .travis.yml
  4. 674
      LICENSE
  5. 1
      Makefile.am
  6. 61
      README.md
  7. 32
      configure.ac
  8. 451
      man/LICENSE
  9. 8
      man/Makefile.am
  10. 49
      man/u6a.1
  11. 57
      man/u6ac.1
  12. 4
      src/Makefile.am
  13. 213
      src/codegen.c
  14. 38
      src/codegen.h
  15. 52
      src/common.h
  16. 77
      src/defs.h
  17. 140
      src/lexer.c
  18. 32
      src/lexer.h
  19. 140
      src/logging.c
  20. 89
      src/logging.h
  21. 83
      src/parser.c
  22. 31
      src/parser.h
  23. 368
      src/runtime.c
  24. 49
      src/runtime.h
  25. 166
      src/u6a.c
  26. 226
      src/u6ac.c
  27. 114
      src/vm_defs.h
  28. 206
      src/vm_pool.c
  29. 56
      src/vm_pool.h
  30. 227
      src/vm_stack.c
  31. 67
      src/vm_stack.h

1
.gitattributes

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*.h linguist-language=c

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# IDE
.idea/
.vscode/
# Autotools
*.cache/
.deps/
config.*
configure
Makefile.in
Makefile
depcomp
compile
libtool
ltmain.sh
install-sh
missing
stamp-h1
.dirstamp
aclocal.m4
# build
*.o
*.lo
*.loT
*.la
*.lai
*.a
*.so
*.dylib
.libs
u6ac
u6a
# others
*.log

0
.travis.yml

674
LICENSE

@ -0,0 +1,674 @@
GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
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This program is distributed in the hope that it will be useful,
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If the program does terminal interaction, make it output a short
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This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
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The hypothetical commands `show w' and `show c' should show the appropriate
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You should also get your employer (if you work as a programmer) or school,
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For more information on this, and how to apply and follow the GNU GPL, see
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<https://www.gnu.org/licenses/why-not-lgpl.html>.

1
Makefile.am

@ -0,0 +1 @@
SUBDIRS = src man

61
README.md

@ -0,0 +1,61 @@
# u6a
[![license](https://img.shields.io/badge/licence-GPLv3-blue.svg)](LICENSE)
Implementation of Unlambda, an esoteric programming language.
## Description
The u6a project provides a C implementation of the [Unlambda](http://www.madore.org/~david/programs/unlambda/) programming language, where Unlambda source code can be compiled into bytecode and executed in a virtual machine.
Ideas behind this implementation can be found [here](https://).
## Requirements
* A POSIX-compliant operating system
* GNU Autotools
* GNU Make
* A C compiler (with C99 support)
## Build
```bash
# (If not already) Install the required build tools.
sudo apt install build-essential automake
# Generate configure files.
autoreconf --install
# Run configure script with desired options.
./configure --prefix=$HOME
# Compile sources and generate executables.
make
# (Optional) Run tests.
make check
# (Optional) Install executables and man pages.
make install
```
## Usage
First, compile an Unlambda source file into bytecode.
```bash
u6ac -o foo.unl.bc foo.unl
```
Then, execute the bytecode file with the interpreter.
```bash
u6a foo.unl.bc
```
See [**u6ac**(1)](man/u6ac.1) and [**u6a**(1)](man/u6a.1) man pages for details.
## TODOs
* `u6adb` - An interactive debugger for Unlambda
* More compile-time optimizations

32
configure.ac

@ -0,0 +1,32 @@
AC_PREREQ([2.69])
AC_INIT([u6a], [0.01], [https://cismon.net])
AM_INIT_AUTOMAKE([foreign])
AC_CONFIG_SRCDIR([src/u6a.c])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_FILES([Makefile src/Makefile man/Makefile])
dnl Checks for programs.
AC_PROG_CC_C99
dnl Checks for libraries.
dnl Checks for header files.
AC_CHECK_HEADERS([arpa/inet.h inttypes.h stddef.h stdint.h stdlib.h string.h unistd.h],
[],
[AC_MSG_ERROR("required header(s) not found")])
dnl Checks for typedefs, structures, and compiler characteristics.
AC_CHECK_HEADER_STDBOOL
AC_C_INLINE
AC_C_RESTRICT
AC_TYPE_UINT16_T
AC_TYPE_UINT32_T
AC_TYPE_UINT8_T
AC_TYPE_SIZE_T
dnl Checks for library functions.
AC_FUNC_MALLOC
AC_FUNC_REALLOC
AC_CHECK_FUNCS([getopt_long strtoul])
AC_OUTPUT

451
man/LICENSE

@ -0,0 +1,451 @@
GNU Free Documentation License
Version 1.3, 3 November 2008
Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
<https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
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8
man/Makefile.am

@ -0,0 +1,8 @@
MAN_DIR = $(prefix)/share/man/man1
MAN_FILES = u6ac.1 u6a.1
install: $(MAN_FILES)
mkdir -p $(MAN_DIR) && cp -t $(MAN_DIR) $^
uninstall: $(MAN_FILES)
pushd $(MAN_DIR) && rm -f $^ && popd

49
man/u6a.1

@ -0,0 +1,49 @@
.TH "U6A" "1" "Jan 30, 2020" "0.0.1" "U6A User Manual"
.
.SH NAME
u6a \- Runtime for the Unlambda programming language
.
.SH SYNOPSIS
\fBu6a\fR [\fIoptions\fR] \fIbytecode\-file\fR
.
.SH DESCRIPTION
Load and execute Unlambda bytecode from the given \fIbytecode\-file\fR, or \fBSTDIN\fR if "-" is given.
.
.SH OPTIONS
.TP
\fB\-s\fR, \fB\-\-stack\-segment\-size\=\fIelem\-count\fR
Specify size of each stack segment of Unlambda VM to \fIelem\-count\fR.
.TP
\fB\-p\fR, \fB\-\-pool\-size\fR=\fIelem\-count\fR
Specify size of object pool of Unlambda VM to \fIelem\-count\fR.
.TP
\fB\-i\fR, \fB\-\-info\fR
Print info (version, segment size, etc.) corresponding to the \fIbytecode\-file\fR, then exit.
.TP
\fB\-f\fR, \fB\-\-force\fR
Attempt to execute even when the \fIbytecode\-file\fR version is not compatible. Meanwhile, ignore unrecognizable instructions and data during execution.
.TP
\fB\-H\fR, \fB\-\-help\fR
Prints help message, then exit.
.TP
\fB\-V\fR, \fB\-\-version\fR
Prints version number, then exit.
.
.SH NOTES
.SS Bytecode Files
.TP
Version compatiblility:
Definition of Unlambda bytecode may differ across multiple versions of u6a. Execution result is guaranteed to be consistent when both MAJOR and MINOR versions of bytecode file and the interpreter matches. Otherwise, the code may not work as expected and the interpreter will refuse to execute unless \fB-f\fR option is provided.
.TP
Redundant data:
While reading data from \fIbytecode\-file\fR, any bytes before the first occurrence of magic number \fI0xDC\fR is ignored. The same is true for bytes after \fI.rodata\fR segment, however, if read from \fBSTDIN\fR, they could be read by the current Unlambda program.
.
.SH SEE ALSO
\fBu6ac\fR(1)
.
.SH COPYRIGHT
Copyright (C) 2020 CismonX <admin@cismon.net>.
.br
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
.br
A copy of the license is included in \fIman/LICENSE\fR.

57
man/u6ac.1

@ -0,0 +1,57 @@
.TH "U6A" "1" "Jan 30, 2020" "0.0.1" "U6A User Manual"
.
.SH NAME
u6ac \- Bytecode compiler for the Unlambda programming language
.
.SH SYNOPSIS
\fBu6ac\fR [\fIoptions\fR] \fIsource\-file\fR
.
.SH DESCRIPTION
Read and compile Unlambda code from the given \fIsource\-file\fR, or \fBSTDIN\fR if "-" is given. Compilation result is saved in a special bytecode format, which can be executed with \fBu6a\fR(1).
.
.SH OPTIONS
.TP
\fB\-o\fR, \fB\-\-output\fR=\fIout\-file\fR
Save compiled bytecode to \fIout\-file\fR, defaults to \fIsource\-file\fR name with ".bc" suffix, or \fBSTDOUT\fR if the source file is read from \fBSTDIN\fR.
.TP
\fB\-\-add\-prefix\fR[=\fIprefix\-string\fR]
Add \fIprefix\-string\fR to the beginning of \fIout\-file\fR. Defaults to "#!/usr/bin/env u6a\\n".
.TP
\fB\-O[\fIoptimization\-level\fR]
Compile-time optimization level. \fB\-O0\fR: Turn off optimization. \fB\-O1\fR(default): Turn on basic optimizations, including constant folding & propagation, dead code elimination, etc.
.TP
\fB\-\-syntax\-only\fR
Only check for lexical and syntactic correctness of the source file, and skips bytecode generation.
.TP
\fB\-v\fR, \fB\-\-verbose\fR
Print extra debug messages to \fBSTDOUT\fR. When this option is enabled, \fIout\-file\fR should not be \fBSTDOUT\fR.
.TP
\fB\-H\fR, \fB\-\-help\fR
Prints help message, then exit.
.TP
\fB\-V\fR, \fB\-\-version\fR
Prints version number, then exit.
.
.SH NOTES
.SS Unlambda
.TP
Language features:
All features of Unlambda 2.0 are supported, including I/O functions, continuations and promises.
.TP
Comments:
Text in line comments is not restricted to ASCII only. UTF-8 format is also supported.
.TP
Function names:
Charactor X in functions \fB.X\fR and \fB?X\fR must be printable ASCII or "\\n" (beware if you are using Windows-style newlines), and are case-sensitive. Other builtin function names are case-insensitive.
.SS Code Size
Unlambda code size should not be larger than 4MiB (not counting comments and whitespaces). You may change this limit in \fIdefs.h\fR and rebuild u6a for larger code to compile.
.
.SH SEE ALSO
\fBu6a\fR(1)
.
.SH COPYRIGHT
Copyright (C) 2020 CismonX <admin@cismon.net>.
.br
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
.br
A copy of the license is included in \fIman/LICENSE\fR.

4
src/Makefile.am

@ -0,0 +1,4 @@
bin_PROGRAMS = u6ac u6a
u6ac_SOURCES = logging.c lexer.c parser.c codegen.c u6ac.c
u6a_SOURCES = logging.c vm_stack.c vm_pool.c runtime.c u6a.c

213
src/codegen.c

@ -0,0 +1,213 @@
/*
* codegen.c - Unlambda VM bytecode generator
*
* Copyright (C) 2020 CismonX <admin@cismon.net>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT 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
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "codegen.h"
#include "logging.h"
#include "vm_defs.h"
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <arpa/inet.h>
#define OPTIMIZE_STR_MIN_LEN 0x04
#define WRITE_SECION(buffer, type_size, len, ostream) \
if (UNLIKELY(len != fwrite(buffer, type_size, len, ostream))) { \
write_len = len * type_size; \
goto codegen_failed; \
}
static FILE* output_stream;
static const char* file_name;
static bool optimize_const;
static const char* err_codegen = "codegen error";
static const char* info_codegen = "codegen";
struct ins_with_offset {
struct u6a_vm_ins ins;
uint32_t offset;
};
static inline bool
write_bc_header(FILE* restrict output_stream, uint32_t text_len, uint32_t rodata_len) {
struct u6a_bc_header header = {
.file = {
.magic = U6A_MAGIC,
.ver_major = U6A_VER_MAJOR,
.ver_minor = U6A_VER_MINOR,
.prog_header_size = U6A_BC_PROG_HEADER_SIZE
},
.prog = {
.text_size = htonl(text_len * sizeof(uint8_t)),
.rodata_size = htonl(rodata_len * sizeof(struct u6a_token))
}
};
return 1 == fwrite(&header, sizeof(struct u6a_bc_header), 1, output_stream);
}
bool
u6a_write_prefix(const char* prefix_string) {
if (prefix_string == NULL) {
return true;
}
uint32_t write_length = strlen(prefix_string);
if (UNLIKELY(write_length != fwrite(prefix_string, sizeof(char), write_length, output_stream))) {
u6a_err_write_failed(err_codegen, write_length, file_name);
return false;
}
u6a_info_verbose(info_codegen, "prefix string written, %" PRIu32 " chars total", write_length);
return true;
}
void
u6a_codegen_init(FILE* output_stream_, const char* file_name_, bool optimize_const_) {
output_stream = output_stream_;
file_name = file_name_;
optimize_const = optimize_const_;
}
bool
u6a_codegen(struct u6a_ast_node* ast_arr, uint32_t ast_len) {
void* bc_buffer = calloc(ast_len, sizeof(struct u6a_vm_ins) + sizeof(char));
if (UNLIKELY(bc_buffer == NULL)) {
u6a_err_bad_alloc(err_codegen, ast_len * (sizeof(struct u6a_vm_ins) + sizeof(char)));
return false;
}
struct u6a_vm_ins* text_buffer = bc_buffer;
char* rodata_buffer = (char*)(text_buffer + ast_len);
uint32_t text_len = 0;
uint32_t rodata_len = 0;
struct ins_with_offset* stack = malloc(ast_len * sizeof(struct ins_with_offset));
if (UNLIKELY(stack == NULL)) {
u6a_err_bad_alloc(err_codegen, ast_len * sizeof(struct ins_with_offset));
free(bc_buffer);
return false;
}
uint32_t stack_top = UINT32_MAX;
for (uint32_t node_idx = 0; node_idx < ast_len; ++node_idx) {
struct u6a_ast_node* node = ast_arr + node_idx;
if (U6A_AN_FN(node) != u6a_tf_app) {
continue;
}
struct u6a_ast_node* lchild = U6A_AN_LEFT(node);
struct u6a_ast_node* rchild = U6A_AN_RIGHT(node, ast_arr);
if (U6A_AN_FN(lchild) == u6a_tf_app) {
if (U6A_AN_FN(rchild) == u6a_tf_app) {
stack[stack_top++].ins.opcode = u6a_vo_sa;
} else {
stack[stack_top++].ins = (struct u6a_vm_ins) {
.opcode = u6a_vo_app,
.operand.fn.second = rchild->value
};
}
} else {
if (U6A_AN_FN(rchild) == u6a_tf_app) {
if (U6A_AN_FN(lchild) == u6a_tf_d) {
text_buffer[text_len].opcode = u6a_vo_del;
stack[stack_top++] = (struct ins_with_offset) {
.ins.opcode = u6a_vo_la,
.offset = text_len++
};
} else {
stack[stack_top++].ins = (struct u6a_vm_ins) {
.opcode = u6a_vo_app,
.operand.fn.first = lchild->value
};
}
} else {
if (optimize_const && U6A_AN_FN(lchild) == u6a_tf_out) {
uint32_t old_rodata_len = rodata_len;
uint32_t old_stack_top = stack_top;
rodata_buffer[rodata_len++] = U6A_AN_CH(lchild);
while (stack_top < UINT32_MAX) {
struct u6a_vm_ins peek_ins = stack[stack_top--].ins;
struct u6a_token operand_first = peek_ins.operand.fn.first;
struct u6a_token operand_second = peek_ins.operand.fn.second;
if (peek_ins.opcode == u6a_vo_app && operand_first.fn == u6a_tf_out && !operand_second.fn) {
rodata_buffer[rodata_len++] = operand_first.ch;
} else {
break;
}
}
// Ignore short strings, as they don't optimize much
if (rodata_len - old_rodata_len < OPTIMIZE_STR_MIN_LEN) {
rodata_len = old_rodata_len;
stack_top = old_stack_top;
goto no_optimize_str;
} else {
rodata_buffer[rodata_len++] = '\0';
text_buffer[text_len++] = (struct u6a_vm_ins) {
.opcode = u6a_vo_lc,
.opcode_ex = u6a_vo_ex_print,
.operand.offset = htonl(old_rodata_len)
};
text_buffer[text_len++] = (struct u6a_vm_ins) {
.opcode = u6a_vo_app,
.operand.fn.second = rchild->value
};
}
} else {
no_optimize_str:
text_buffer[text_len++] = (struct u6a_vm_ins) {
.opcode = u6a_vo_app,
.operand.fn = {
.first = lchild->value,
.second = rchild->value
}
};
}
while (stack_top < UINT32_MAX) {
struct ins_with_offset* top_elem = stack + stack_top--;
if (top_elem->ins.opcode == u6a_vo_sa) {
text_buffer[text_len].opcode = u6a_vo_sa;
stack[stack_top++] = (struct ins_with_offset) {
.ins.opcode = u6a_vo_la,
.offset = text_len++
};
break;
} else {
text_buffer[text_len++] = top_elem->ins;
if (top_elem->ins.opcode == u6a_vo_la) {
text_buffer[top_elem->offset].operand.offset = htonl(text_len);
}
}
}
}
}
}
uint32_t write_len;
if (UNLIKELY(!write_bc_header(output_stream, text_len, rodata_len))) {
write_len = sizeof(struct u6a_bc_header);
goto codegen_failed;
}
WRITE_SECION(text_buffer, sizeof(struct u6a_vm_ins), text_len, output_stream);
WRITE_SECION(rodata_buffer, sizeof(char), rodata_len, output_stream);
free(bc_buffer);
free(stack);
u6a_info_verbose(info_codegen, "completed, text: %" PRIu32 ", rodata: %" PRIu32, text_len, rodata_len);
return true;
codegen_failed:
u6a_err_write_failed(err_codegen, write_len, file_name);
free(bc_buffer);
free(stack);
return false;
}

38
src/codegen.h

@ -0,0 +1,38 @@
/*
* codegen.h - Unlambda VM bytecode generator definitions
*
* Copyright (C) 2020 CismonX <admin@cismon.net>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT 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
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef U6A_CODEGEN_H_
#define U6A_CODEGEN_H_
#include "common.h"
#include "defs.h"
#include <stdbool.h>
#include <stdio.h>
void
u6a_codegen_init(FILE* output_stream, const char* file_name, bool optimize_const);
bool
u6a_write_prefix(const char* prefix_string);
bool
u6a_codegen(struct u6a_ast_node* ast_arr, uint32_t ast_len);
#endif

52
src/common.h

@ -0,0 +1,52 @@
/*
* common.h - common includes and definitions
*
* Copyright (C) 2020 CismonX <admin@cismon.net>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT 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
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef U6A_COMMON_H_
#define U6A_COMMON_H_
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef __GNUC__
#define LIKELY(expr) __builtin_expect(!!(expr), 1)
#define UNLIKELY(expr) __builtin_expect(!!(expr), 0)
#define U6A_COLD __attribute__((cold))
#define U6A_HOT __attribute__((hot))
#define U6A_NOT_REACHED() __builtin_unreachable()
#else
#define LIKELY(expr) (expr)
#define UNLIKELY(expr) (expr)
#define U6A_COLD
#define U6A_HOT
#define U6A_NOT_REACHED()
#endif
#ifdef __linux__
#include <linux/limits.h>
#else
#include <limits.h>
#endif
#define U6A_MAGIC 0xDC /* Latin 'U' with diaeresis */
#define U6A_VER_MAJOR 0x00
#define U6A_VER_MINOR 0x00
#define U6A_VER_PATCH 0x00
#endif

77
src/defs.h

@ -0,0 +1,77 @@
/*
* defs.h - miscellaneous definitions
*
* Copyright (C) 2020 CismonX <admin@cismon.net>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT 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
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef U6A_DEFS_H_
#define U6A_DEFS_H_
#include "common.h"
#include <stdint.h>
#include <stddef.h>
#define U6A_TOKEN_FN_CHAR ( 1 << 6 )
#define U6A_TOKEN_FN_APP ( 1 << 5 )
enum u6a_token_fn {
u6a_tf_placeholder_,
u6a_tf_k, u6a_tf_s, u6a_tf_i, u6a_tf_v, u6a_tf_c, u6a_tf_d, u6a_tf_e,
u6a_tf_in, /* @ */
u6a_tf_pipe, /* | */
u6a_tf_out = U6A_TOKEN_FN_CHAR, /* . */
u6a_tf_cmp, /* ? */
u6a_tf_app = U6A_TOKEN_FN_APP /* ` */
};
struct u6a_token {
uint8_t fn;
uint8_t ch;
};
#define U6A_TOKEN(fn_, ch_) (struct u6a_token) { .fn = (fn_), .ch = (ch_) }
#define U6A_TOKEN_INIT_LEN ( 4 * 1024 )
#define U6A_TOKEN_MAX_LEN ( U6A_TOKEN_INIT_LEN * 1024 )
struct u6a_ast_node {
struct u6a_token value;
uint16_t reserved_;
uint32_t sibling; /* index of sibling when this is left child, otherwise 0 */
};
#define U6A_AN_FN(node) (node)->value.fn
#define U6A_AN_CH(node) (node)->value.ch
#define U6A_AN_LEFT(node) ( (node) + 1 )
#define U6A_AN_RIGHT(node, head) ( (head) + U6A_AN_LEFT(node)->sibling )
struct u6a_bc_header {
struct {
uint8_t magic; /* the "magic byte" for Unlambda bytecode files */
uint8_t ver_major;
uint8_t ver_minor;
uint8_t prog_header_size;
} file;
struct {
uint32_t text_size; /* length of text segment (Bytes) */
uint32_t rodata_size; /* length of rodata segment (Bytes) */
} prog;
};
#define U6A_BC_FILE_HEADER_SIZE sizeof(((struct u6a_bc_header*)NULL)->file)
#define U6A_BC_PROG_HEADER_SIZE sizeof(((struct u6a_bc_header*)NULL)->prog)
#endif

140
src/lexer.c

@ -0,0 +1,140 @@
/*
* lexer.c - Unlambda lexer
*
* Copyright (C) 2020 CismonX <admin@cismon.net>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be