mirror of
https://github.com/RevCurtisP/C02.git
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127 lines
5.3 KiB
Markdown
127 lines
5.3 KiB
Markdown
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C02 is a simple C-syntax language designed to generate highly optimized
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code for the 6502 microprocessor. The C02 specification is a highly
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specific subset of the C standard with some modifications and extensions
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The compiler generates assembly language code, currently targeted to the DASM assembler.
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See the top-level [documentation](doc/c02.txt) for more information.
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## Building the Compiler
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In Linux, use gcc and the [Makefile](./Makefile).
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In Windows use the [Pelles C IDE](http://www.smorgasbordet.com/pellesc/) and the file [./C02.ppj](c02.ppj).
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## Compiling C02 programs
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At a command line, cd into the appropriate directory, e.g. [py65](py65/) or [vic20](vic20/).
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Execute the c02 compiler from the parent directory using the c02 source file (without the .c02 extension) as an argument.
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For example, to compile the program [conds.c02](py65/conds.c02), in the [py65](py65/) directory, use the command
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../c02 conds
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in Linux, or
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..\c02 conds
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in Windows.
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Some of the subdirectories contain a c02.bat file, which will compile
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the .c02 program, then run dasm to assemble the code. However, the path
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to dasm is hardcoded, so you will likely need to change it.
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The file [c02.sh](./c02sh) provides the same functionality in Linux,
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but it may not be in a working state.
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## Syntax Examples
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```
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/* Directives */
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#include <header.h02> //Include header from standard library
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#include "inc/hdr.h02" //Include header from local directory
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#pragma origin 8192 //Set start address of object code
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#pragma zeropage $80 //Set start address of zero page variables
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/* Constants */
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#define TRUE = $FF ; //Constants
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#define FALSE = 0
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enum {BLACK, WHITE, RED, CYAN, PURPLE, GREEN, BLUE, YELLOW};
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/* Structures */
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struct record {char name[8]; char index;}; //Struct Definition
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struct record rec; //Struct Declaration
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/* Variables and Array Declarations */
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char b, c, d, e, f, g, h; //8-bit Variables
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int i, j; //16-bit Variables
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zeropage char p, q; //8-bit Variables in Page 0
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zeropage int u, v; //16-bit Variables in Page 0
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const char nine = 9; //Const 8-bit variable set to decimal literal
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const char maxsiz = $FF; //Const 8-bit variable set to hexadecimal literal
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const char flag = %01010101; //Const 8-bit variable set to binary literal
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const char debug = #TRUE; //Const 8-bit variable set to constant
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const int k = $1234; //Const 16-bit variable set to hexadecimal literal
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char r[7]; //8 byte Array (decimal dimension)
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aligned char m[$FF]; //256 byte array aligned to page boundary
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const char n = {1,2,3}; //Const array set to literal list
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const char s = "string"; //Const array set to string literal
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const char t = {"one", 1); //Const array set to mixed list
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/* Functions Declarations */
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void myfunc(); //Forward declaration of function
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char fnc(c) { /*function body */} //One 8-bit Parameter
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char fnd(c,d) { /*function body */} //Two 8-bit Parameters
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char fne(c,d,e) { /*function body */} //Three 8-bit Parameters
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char fni(i) { /*function body */} //One 16-bit Parameter
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char fnj(c,i) { /*function body */} //8-bit and 16-bit Parameters
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/* Returning from a Function */
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return c, d, e; //Return up to three 8-bit values
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return c,j; //Return an 8-bit an 16-bit value
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return i; //Return a 16-bit value
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return; //No explicit return values
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/* Assignments */
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hmove; s80vid; //Implicit Assignments
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x = 0; y = a; a = 1; //Register Assignments
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b = c + d - e & f | g ^ h; //Assignment and Expression
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r[f] = m[g+1] & t[h-1]; //Array Indexing
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r[j] = r[a] + s[x] + t[y]; //Arrays Indexed by Register
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d = (e>f) ? d[e] : e[f]; //Shortcut If
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b<< ;c[d]>>; x++; y--; //Post-Operations
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/* Function Calls */
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b = abs(c); d = min(e,f), plot(b,c,d); //Up to Three Char Arguments
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b = div(c+d,e)) - f; c = mult(d+e, f); //Expression in First Arg Only
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j = swap(i); j = ishift(b, i); //Pass Int or Char with Int
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puts("string"); fputs(f, &s); //Passing Strings and Arrays
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setdst(&r); b = strcpy(&s); //Using Multiple String Arguments
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proc(@record, &record); //Pass Length and Address of Struct
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c = getc(); setptr(?,g,h); //No Args and Skipped Arguments
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b,c = scnpos(); d,e,f = get3d(); //Plural Assignments
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push b,c; mult(); pop p; //Pass Arguments via Stack
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iprint(); inline "Hello World"; //Pass Inline String Argument
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irect(); inline 10,10,100,100; //Pass Inline Char Arguments
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icpstr(); inline &r, &s; //Pass Inline Address Arguments
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/* Control Structures */
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if (c = 27) goto end;
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if (b) e = div(f,g) else puts("Division by 0!");
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if (b==0 || b>10 && b<20) fprint(n,"input %d in range");
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c = 'A' ; while (c <= 'Z') { putc(c); c++; }
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while() { c=rdkey; if (c=0) continue; putchr(c); if (c=13) break; }
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do c = rdkey(); while (c=0);
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do {c = getchr(); putchr(c);} while (c<>13)
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for (c='A'; c<='Z'; c++) putc(c);
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for (i=strlen(s)-1;i:+;i--) putc(s[i]);
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for (i=0;c>0;i++) { c=getc(); s[i]=c }
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select (getc()) {
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case $0D: putln("The Enter key");
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case #ESCKEY: if (#NOESC) break; goto escape;
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case 'A','a': putln ("The letter A");
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default: putln("some other key");
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}
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end: //Label
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```
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