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bf_compiler.cpp
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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <algorithm>
#define MEMORY_SIZE 30000
#define BUFFER_SIZE 1000000
inline void substring(const char *inputString, int startPos, int length, char *outputString)
{
int i;
for(i = 0; i < length && inputString[startPos + i] != '\0'; i++) {
outputString[i] = inputString[startPos + i];
}
outputString[i] = '\0';
}
inline constexpr char special_to_escaped(const char& chr)
{
switch (chr)
{
case '\n':
return 'n';
case '\r':
return 'r';
case '\t':
return 't';
case '\\':
return '\\';
case '\"':
return '\"';
default:
return '\0';
}
}
inline constexpr bool is_special(const char& chr)
{
if (chr == '\n' || chr == '\r' || chr == '\t' || chr == '\\' || chr == '\"')
return true;
return false;
}
int main(int argc, const char *argv[])
{
/*
Flags in target program
-O[0-2] 0 does nothing, 1 enables code-logic optimizations, 2 enables compile-time evaluation
-Opf enables putchar to printf optimization (at least most of times optimization) (Only to be used with -O2)
-Oc[0-3, fast] specifies internal GCC's optimization flag for C code
*/
if (argc < 2) {
printf("Usage: %s {filename}.bf [-O[0-2], -Opf, -Oc[0-3, fast], -o {filename}.exe\n", argv[0]);
return 1;
}
const char *input_filename = argv[1];
char output_filename[256] = "out.exe", c_output_filename[256] = "out.c";
bool printf_optimized = false;
uint8_t optimization_level = 0;
char c_optimized[5] = {0};
// Parse command-line arguments
for (int i = 1; i < argc - 1; i++)
{
if (strcmp(argv[i], "-o") == 0)
{
strcpy(output_filename, argv[i + 1]);
// Copy the output filename without the .exe extension
strcpy(c_output_filename, argv[i + 1]); // Copy the output filename without the .exe extension
char* dot;
if ((dot = std::find(c_output_filename, c_output_filename + 256, '.')) != c_output_filename + 256) {
*dot = '\0'; // Null-terminate the string at the position of the last '.'
}
strcat(c_output_filename, ".c"); // Append ".c" extension
}
else if (strncmp(argv[i], "-Oc", 3) == 0)
{
substring(argv[i], 3, 5, c_optimized);
}
else if (strcmp(argv[i], "-Opf") == 0)
{
printf_optimized = true;
}
else if (strncmp(argv[i], "-O", 2) == 0)
{
optimization_level = argv[i][2] - '0';
}
}
printf("Optimization: %i\n", optimization_level);
FILE *file = fopen(input_filename, "r"); // Open the input file in read mode
if (file == NULL) {
perror("Error opening input file");
return 1;
}
// Allocate memory for a buffer
char buffer[BUFFER_SIZE];
uint64_t bytesRead;
// Read the file into the buffer
bytesRead = fread(buffer, sizeof(char), BUFFER_SIZE, file);
if (!bytesRead) {
perror("Error reading input file");
fclose(file);
return 1;
}
// Close the input file
fclose(file);
// Create new file for C output
FILE *outFile = fopen(c_output_filename, "w");
// Check if output file opened successfully
if (!outFile) {
perror("Error creating output file");
return 1;
}
buffer[bytesRead] = '\0';
char *buf_ptr = buffer - 1;
bool printf_printed = false;
char printf_args[500000] = {0};
int index_pa = 0;
if (optimization_level == 2)
{
// Print the C code onto the file
bool found_comma = false, found_dot = false;
while (*++buf_ptr)
{
switch (*buf_ptr)
{
case ',':
found_comma = true;
break;
case '.':
found_dot = true;
break;
default:
break;
}
}
buf_ptr = buffer;
if (found_dot || found_comma)
fprintf(outFile, "#include <stdio.h>\n");
fprintf(outFile, "int main(){");
if (found_comma)
{
fprintf(outFile, "char array[");
fprintf(outFile, "%li", MEMORY_SIZE);
fprintf(outFile, "]={0},*ptr=array;");
}
char array[MEMORY_SIZE] = {0};
int32_t array_ptr_diff = 0, loop_stack_ptr = -1;
bool not_constant_value[MEMORY_SIZE] = {false};
if (found_dot)
{
int32_t loop_stack[MEMORY_SIZE];
int32_t array_ptr = 0;
buf_ptr = buffer;
while (*++buf_ptr)
{
switch (*buf_ptr)
{
case '>':
++array_ptr;
break;
case '<':
--array_ptr;
break;
case '+':
++array[array_ptr];
break;
case '-':
--array[array_ptr];
break;
case '.':
if (printf_optimized)
{
if (!printf_printed)
{
fprintf(outFile, "printf(\"");
printf_printed = true;
}
if (!not_constant_value[array_ptr])
{
// NULL character handling
if (!array[array_ptr])
{
fprintf(outFile, "%%c");
snprintf(printf_args + index_pa, sizeof(printf_args) - index_pa, ",0");
index_pa += 2;
}
// percent character handling
else if (array[array_ptr] == '%')
fprintf(outFile, "%%%%");
// other special characters handling
else if (is_special(array[array_ptr]))
fprintf(outFile, "\\%c", special_to_escaped(array[array_ptr]));
// characters that don't need to be escaped in any way
else
fprintf(outFile, "%c", array[array_ptr]);
}
else
{
fprintf(outFile, "%%c");
snprintf(printf_args + index_pa, sizeof(printf_args) - index_pa, ",*(ptr+%i)+=%i", array_ptr, array[array_ptr]);
index_pa += 10;
char num_str[20];
ltoa(array_ptr, num_str, 10);
index_pa += strlen(num_str);
memset(num_str, 0, 20);
ltoa(array[array_ptr], num_str, 10);
index_pa += strlen(num_str);
array[array_ptr] = 0; // Reset the value
}
}
else
{
if (!not_constant_value[array_ptr])
fprintf(outFile, "putchar(%i);", array[array_ptr]);
else {
fprintf(outFile, "putchar(*(ptr+%i)+=%i);", array_ptr, array[array_ptr]);
array[array_ptr] = 0; // Reset the value
}
}
break;
case ',':
not_constant_value[array_ptr] = true;
if (printf_optimized && printf_printed)
{
fprintf(outFile, "\"%s);*(ptr+%i)=getchar();", printf_args, array_ptr);
index_pa = 0;
memset(printf_args, 0, sizeof(printf_args));
printf_printed = false;
}
else
fprintf(outFile, "*(ptr+%i)=getchar();", array_ptr);
break;
case '[':
if (!array[array_ptr])
{
// Jump to matching ']'
int loop_count = 1;
while (loop_count)
{
if (*++buf_ptr == '[') ++loop_count;
else if (*buf_ptr == ']') --loop_count;
}
}
else
loop_stack[++loop_stack_ptr] = buf_ptr - buffer; // Push position of '[' onto loop stack
break;
case ']':
if (array[array_ptr])
buf_ptr = buffer + loop_stack[loop_stack_ptr]; // Jump back to corresponding '['
else
--loop_stack_ptr; // Pop from loop stack
break;
case '@':
goto exitwhile;
break;
default:
break;
}
}
exitwhile:
if (printf_optimized)
fprintf(outFile, "\"%s);", printf_args);
}
}
else if (optimization_level == 1)
{
// Print the C code onto the file
char array[MEMORY_SIZE] = {0};
int array_ptr = 0, array_ptr_diff = 0;
fprintf(outFile, "#include <stdio.h>\nint main(){");
fprintf(outFile, "char array[");
fprintf(outFile, "%li", MEMORY_SIZE);
fprintf(outFile, "]={0},*ptr=array;");
while (*++buf_ptr)
{
if (buf_ptr + 2 < buffer + bytesRead && *buf_ptr == '[' && (*(buf_ptr + 1) == '+' || *(buf_ptr + 1) == '-') && *buf_ptr == ']')
{
fprintf(outFile, "*ptr=0;");
buf_ptr += 3;
}
switch (*buf_ptr)
{
// Handling BF statements
case '>':
if (printf_optimized && printf_printed)
{
fprintf(outFile, "\"%s);", printf_args);
index_pa = 0;
memset(printf_args, 0, sizeof(printf_args));
printf_printed = false;
}
if (array[array_ptr])
{
if (array[array_ptr] > 1)
fprintf(outFile, "*ptr+=%i;", array[array_ptr]);
else if (array[array_ptr] == 1)
fprintf(outFile, "++*ptr;");
else if (array[array_ptr] == -1)
fprintf(outFile, "--*ptr;");
else
fprintf(outFile, "*ptr-=%i;", -array[array_ptr]);
array[array_ptr] = 0;
}
++array_ptr;
++array_ptr_diff;
break;
case '<':
if (printf_optimized && printf_printed)
{
fprintf(outFile, "\"%s);", printf_args);
index_pa = 0;
memset(printf_args, 0, sizeof(printf_args));
printf_printed = false;
}
if (array[array_ptr])
{
if (array[array_ptr] > 1)
fprintf(outFile, "*ptr+=%i;", array[array_ptr]);
else if (array[array_ptr] == 1)
fprintf(outFile, "++*ptr;");
else if (array[array_ptr] == -1)
fprintf(outFile, "--*ptr;");
else
fprintf(outFile, "*ptr-=%i;", -array[array_ptr]);
array[array_ptr] = 0;
}
--array_ptr;
--array_ptr_diff;
break;
case '+':
if (printf_optimized && printf_printed)
{
fprintf(outFile, "\"%s);", printf_args);
index_pa = 0;
memset(printf_args, 0, sizeof(printf_args));
printf_printed = false;
}
if (array_ptr_diff)
{
if (array_ptr_diff > 1)
fprintf(outFile, "ptr+=%i;", array_ptr_diff);
else if (array_ptr_diff == 1)
fprintf(outFile, "++ptr;");
else if (array_ptr_diff == -1)
fprintf(outFile, "--ptr;");
else
fprintf(outFile, "ptr-=%i;", -array_ptr_diff);
array_ptr_diff = 0;
}
//fprintf(outFile, "++*ptr;");
++array[array_ptr];
break;
case '-':
if (printf_optimized && printf_printed)
{
fprintf(outFile, "\"%s);", printf_args);
index_pa = 0;
memset(printf_args, 0, sizeof(printf_args));
printf_printed = false;
}
if (array_ptr_diff)
{
if (array_ptr_diff > 1)
fprintf(outFile, "ptr+=%i;", array_ptr_diff);
else if (array_ptr_diff == 1)
fprintf(outFile, "++ptr;");
else if (array_ptr_diff == -1)
fprintf(outFile, "--ptr;");
else
fprintf(outFile, "ptr-=%i;", -array_ptr_diff);
array_ptr_diff = 0;
}
//fprintf(outFile, "--*ptr;");
--array[array_ptr];
break;
case '.':
if (array_ptr_diff)
{
if (array_ptr_diff > 1)
fprintf(outFile, "ptr+=%i;", array_ptr_diff);
else if (array_ptr_diff == 1)
fprintf(outFile, "++ptr;");
else if (array_ptr_diff == -1)
fprintf(outFile, "--ptr;");
else
fprintf(outFile, "ptr-=%i;", -array_ptr_diff);
array_ptr_diff = 0;
}
if (array[array_ptr])
{
if (array[array_ptr] > 1)
fprintf(outFile, "*ptr+=%i;", array[array_ptr]);
else if (array[array_ptr] == 1)
fprintf(outFile, "++*ptr;");
else if (array[array_ptr] == -1)
fprintf(outFile, "--*ptr;");
else
fprintf(outFile, "*ptr-=%i;", -array[array_ptr]);
array[array_ptr] = 0;
}
if (printf_optimized)
{
if (!printf_printed)
{
fprintf(outFile, "printf(\"");
printf_printed = true;
}
fprintf(outFile, "%%c");
snprintf(printf_args + index_pa, sizeof(printf_args) - index_pa, ",*ptr");
index_pa += 5;
}
else
fprintf(outFile, "putchar(*ptr);");
break;
case ',':
if (printf_optimized && printf_printed)
{
fprintf(outFile, "\"%s);", printf_args);
index_pa = 0;
memset(printf_args, 0, sizeof(printf_args));
printf_printed = false;
}
if (array_ptr_diff)
{
if (array_ptr_diff > 1)
fprintf(outFile, "ptr+=%i;", array_ptr_diff);
else if (array_ptr_diff == 1)
fprintf(outFile, "++ptr;");
else if (array_ptr_diff == -1)
fprintf(outFile, "--ptr;");
else
fprintf(outFile, "ptr-=%i;", -array_ptr_diff);
array_ptr_diff = 0;
}
array[array_ptr] = 0;
fprintf(outFile, "*ptr=getchar();");
break;
case '[':
if (printf_optimized && printf_printed)
{
fprintf(outFile, "\"%s);", printf_args);
index_pa = 0;
memset(printf_args, 0, sizeof(printf_args));
printf_printed = false;
}
if (array_ptr_diff)
{
if (array_ptr_diff > 1)
fprintf(outFile, "ptr+=%i;", array_ptr_diff);
else if (array_ptr_diff == 1)
fprintf(outFile, "++ptr;");
else if (array_ptr_diff == -1)
fprintf(outFile, "--ptr;");
else
fprintf(outFile, "ptr-=%i;", -array_ptr_diff);
array_ptr_diff = 0;
}
if (array[array_ptr])
{
if (array[array_ptr] > 1)
fprintf(outFile, "*ptr+=%i;", array[array_ptr]);
else if (array[array_ptr] == 1)
fprintf(outFile, "++*ptr;");
else if (array[array_ptr] == -1)
fprintf(outFile, "--*ptr;");
else
fprintf(outFile, "*ptr-=%i;", -array[array_ptr]);
array[array_ptr] = 0;
}
fprintf(outFile, "while(*ptr){");
break;
case ']':
if (printf_optimized && printf_printed)
{
fprintf(outFile, "\"%s);", printf_args);
index_pa = 0;
memset(printf_args, 0, sizeof(printf_args));
printf_printed = false;
}
if (array_ptr_diff)
{
if (array_ptr_diff > 1)
fprintf(outFile, "ptr+=%i;", array_ptr_diff);
else if (array_ptr_diff == 1)
fprintf(outFile, "++ptr;");
else if (array_ptr_diff == -1)
fprintf(outFile, "--ptr;");
else
fprintf(outFile, "ptr-=%i;", -array_ptr_diff);
array_ptr_diff = 0;
}
if (array[array_ptr])
{
if (array[array_ptr] > 1)
fprintf(outFile, "*ptr+=%i;", array[array_ptr]);
else if (array[array_ptr] == 1)
fprintf(outFile, "++*ptr;");
else if (array[array_ptr] == -1)
fprintf(outFile, "--*ptr;");
else
fprintf(outFile, "*ptr-=%i;", -array[array_ptr]);
array[array_ptr] = 0;
}
fprintf(outFile, "}");
break;
case '@':
goto exitwhile3;
break;
default:
break;
}
}
exitwhile3:
if (printf_optimized && printf_printed)
fprintf(outFile, "%s);", printf_args);
}
else
{
// Print the C code onto the file
fprintf(outFile, "#include <stdio.h>\nint main(){");
fprintf(outFile, "char array[");
fprintf(outFile, "%li", MEMORY_SIZE);
fprintf(outFile, "]={0},*ptr=array;");
while (*++buf_ptr)
{
switch (*buf_ptr)
{
// Handling BF statements
case '>':
if (printf_optimized && printf_printed)
{
fprintf(outFile, "\"%s);", printf_args);
index_pa = 0;
memset(printf_args, 0, sizeof(printf_args));
printf_printed = false;
}
fprintf(outFile, "++ptr;");
break;
case '<':
if (printf_optimized && printf_printed)
{
fprintf(outFile, "\"%s);", printf_args);
index_pa = 0;
memset(printf_args, 0, sizeof(printf_args));
printf_printed = false;
}
fprintf(outFile, "--ptr;");
break;
case '+':
if (printf_optimized && printf_printed)
{
fprintf(outFile, "\"%s);", printf_args);
index_pa = 0;
memset(printf_args, 0, sizeof(printf_args));
printf_printed = false;
}
fprintf(outFile, "++*ptr;");
break;
case '-':
if (printf_optimized && printf_printed)
{
fprintf(outFile, "\"%s);", printf_args);
index_pa = 0;
memset(printf_args, 0, sizeof(printf_args));
printf_printed = false;
}
fprintf(outFile, "--*ptr;");
break;
case '.':
if (printf_optimized)
{
if (!printf_printed)
{
fprintf(outFile, "printf(\"");
printf_printed = true;
}
fprintf(outFile, "%%c");
snprintf(printf_args + index_pa, sizeof(printf_args) - index_pa, ",*ptr");
index_pa += 5;
}
else
fprintf(outFile, "putchar(*ptr);");
break;
case ',':
if (printf_optimized && printf_printed)
{
fprintf(outFile, "\"%s);", printf_args);
index_pa = 0;
memset(printf_args, 0, sizeof(printf_args));
printf_printed = false;
}
fprintf(outFile, "*ptr = getchar();");
break;
case '[':
if (printf_optimized && printf_printed)
{
fprintf(outFile, "\"%s);", printf_args);
index_pa = 0;
memset(printf_args, 0, sizeof(printf_args));
printf_printed = false;
}
fprintf(outFile, "while(*ptr){");
break;
case ']':
if (printf_optimized && printf_printed)
{
fprintf(outFile, "\"%s);", printf_args);
index_pa = 0;
memset(printf_args, 0, sizeof(printf_args));
printf_printed = false;
}
fprintf(outFile, "}");
break;
case '@':
goto exitwhile2;
break;
default:
break;
}
}
exitwhile2:
if (printf_optimized && printf_printed)
fprintf(outFile, "\"%s);", printf_args);
}
// Closing bracket for 'int main()' function
fprintf(outFile, "return 0;}");
fclose(outFile);
// Compile the file using GCC, which is hopefully on the %PATH%.
char compile_command[550];
if (c_optimized[0])
snprintf(compile_command, sizeof(compile_command), "gcc -std=c23 -O%s %s -o %s", c_optimized, c_output_filename, output_filename);
else
snprintf(compile_command, sizeof(compile_command), "gcc -std=c23 %s -o %s", c_output_filename, output_filename);
printf("%s\n%s\n%s\n%s", c_output_filename, output_filename, compile_command, c_optimized);
const int compile_result = system(compile_command);
if (compile_result) {
printf("\nError compiling C code with GCC: %i", compile_result);
return 1;
}
printf("\nGCC compilation successful. Output executable: %s\n", output_filename);
// Delete the generated C file
/*if (unlink(c_output_filename) == -1) {
perror("Error deleting C file");
return 1;
}*/
return 0;
}