mirror of
https://github.com/bradgrantham/apple2a.git
synced 2024-05-31 19:41:36 +00:00
RUN works.
This commit is contained in:
parent
fbed276344
commit
e3f29f7dc5
2
Makefile
2
Makefile
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@ -15,7 +15,7 @@ $(ROM): a.out
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(dd count=5 bs=4096 if=/dev/zero 2> /dev/null; cat a.out) > $(ROM)
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run: $(ROM)
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$(APPLE2E) -map main.map $(ROM)
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$(APPLE2E) -mute -map main.map $(ROM)
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a.out: main.o interrupt.o vectors.o exporter.o platform.o runtime.o apple2rom.cfg $(LIB)
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$(CC65)/ld65 -C apple2rom.cfg -m main.map --dbgfile main.dbg interrupt.o vectors.o exporter.o platform.o runtime.o main.o $(LIB)
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233
main.c
233
main.c
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@ -24,6 +24,10 @@ uint8_t title_length = 9;
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#define T_PRINT 0x81
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#define T_LIST 0x82
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#define T_POKE 0x83
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#define T_RUN 0x84
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// Line number used for "no line number".
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#define INVALID_LINE_NUMBER 0xFFFF
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// List of tokens. The token value is the index plus 0x80.
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static uint8_t *TOKEN[] = {
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@ -31,6 +35,7 @@ static uint8_t *TOKEN[] = {
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"PRINT",
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"LIST",
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"POKE",
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"RUN",
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};
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static int16_t TOKEN_COUNT = sizeof(TOKEN)/sizeof(TOKEN[0]);
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@ -38,7 +43,7 @@ uint8_t g_input_buffer[40];
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int16_t g_input_buffer_length = 0;
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// Compiled binary.
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uint8_t g_compiled[128];
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uint8_t g_compiled[1024];
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int16_t g_compiled_length = 0;
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void (*g_compiled_function)() = (void (*)()) g_compiled;
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@ -220,8 +225,8 @@ static uint8_t *compile_expression(uint8_t *s) {
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}
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/**
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* Tokenize a string in place. Returns (and removes) any line number, or 0xFFFF
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* if there's none.
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* Tokenize a string in place. Returns (and removes) any line number, or
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* INVALID_LINE_NUMBER if there's none.
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*/
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static uint16_t tokenize(uint8_t *s) {
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uint8_t *t = s; // Tokenized version.
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@ -231,7 +236,7 @@ static uint16_t tokenize(uint8_t *s) {
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if (*s >= '0' && *s <= '9') {
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line_number = parse_uint16(&s);
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} else {
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line_number = 0xFFFF;
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line_number = INVALID_LINE_NUMBER;
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}
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// Convert tokens.
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@ -286,111 +291,151 @@ static uint8_t *find_line(uint16_t line_number) {
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return line;
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}
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/**
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* Call to configure the compilation step.
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*/
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static void set_up_compile(void) {
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g_compiled_length = 0;
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}
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/**
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* Compile the tokenized line of BASIC, adding it to the g_compiled binary.
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*/
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static void compile_buffer(uint8_t *buffer) {
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uint8_t *s = buffer;
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uint8_t done;
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do {
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int8_t error = 0;
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// Default to being done after one statement.
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done = 1;
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if (*s == '\0' || *s == ':') {
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// Empty statement. We skip the colon below.
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} else if (*s == T_HOME) {
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s += 1;
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add_call(home);
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} else if (*s == T_PRINT) {
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s += 1;
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if (*s >= '0' && *s <= '9') { // TODO: Add negative sign and open parenthesis.
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// Parse expression.
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s = compile_expression(s);
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add_call(print_int);
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}
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add_call(print_newline);
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} else if (*s == T_LIST) {
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s += 1;
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add_call(list_statement);
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} else if (*s == T_POKE) {
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s += 1;
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// Parse address.
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s = compile_expression(s);
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// Copy from AX to ptr1.
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g_compiled[g_compiled_length++] = I_STA_ZPG;
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g_compiled[g_compiled_length++] = (uint8_t) &ptr1;
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g_compiled[g_compiled_length++] = I_STX_ZPG;
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g_compiled[g_compiled_length++] = (uint8_t) &ptr1 + 1;
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if (*s == ',') {
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s++;
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}
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// Parse value. LSB is in A.
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s = compile_expression(s);
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g_compiled[g_compiled_length++] = I_LDY_IMM;
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g_compiled[g_compiled_length++] = 0;
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g_compiled[g_compiled_length++] = I_STA_IND_Y;
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g_compiled[g_compiled_length++] = (uint8_t) &ptr1;
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} else {
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error = 1;
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}
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// Now we're at the end of our statement.
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if (!error) {
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if (*s == ':') {
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// Skip colon.
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s += 1;
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// Next statement.
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done = 0;
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} else if (*s != '\0') {
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// Junk at the end of the statement.
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error = 1;
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}
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}
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if (error) {
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add_call(syntax_error);
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}
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} while (!done);
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}
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/**
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* Complete the compilation buffer and run it.
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*/
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static void complete_compile_and_execute(void) {
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// Return from function.
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add_return();
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// Dump compiled buffer to the terminal.
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{
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int i;
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uint8_t *debug_port = (uint8_t *) 0xBFFE;
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debug_port[0] = g_compiled_length;
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for (i = 0; i < g_compiled_length; i++) {
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debug_port[1] = g_compiled[i];
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}
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}
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if (g_compiled_length > sizeof(g_compiled)) {
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// TODO: Check while adding bytes, not at the end.
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print("\n?Binary length exceeded");
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} else {
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// Call it.
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g_compiled_function();
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}
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}
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/**
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* Compile the stored program and execute it.
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*/
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static void compile_stored_program(void) {
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uint8_t *line = g_program;
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uint8_t *next_line;
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while ((next_line = get_next_line(line)) != 0) {
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uint16_t line_number = get_line_number(line);
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compile_buffer(line + 4);
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line = next_line;
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}
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}
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/**
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* Process the user's line of input, possibly compiling the code.
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* and executing it.
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*/
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static void process_input_buffer() {
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uint8_t *s; // Where we are in the buffer.
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int8_t done;
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uint16_t line_number;
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g_input_buffer[g_input_buffer_length] = '\0';
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// Tokenize in-place.
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line_number = tokenize(g_input_buffer);
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if (line_number == 0xFFFF) {
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if (line_number == INVALID_LINE_NUMBER) {
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// Immediate mode.
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s = g_input_buffer;
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// Compile the line of BASIC.
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g_compiled_length = 0;
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do {
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int8_t error = 0;
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// Default to being done after one statement.
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done = 1;
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if (*s == '\0' || *s == ':') {
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// Empty statement.
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} else if (*s == T_HOME) {
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s += 1;
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add_call(home);
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} else if (*s == T_PRINT) {
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s += 1;
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if (*s >= '0' && *s <= '9') { // TODO: Add negative sign and open parenthesis.
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// Parse expression.
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s = compile_expression(s);
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add_call(print_int);
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}
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add_call(print_newline);
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} else if (*s == T_LIST) {
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s += 1;
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add_call(list_statement);
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} else if (*s == T_POKE) {
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s += 1;
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// Parse address.
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s = compile_expression(s);
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// Copy from AX to ptr1.
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g_compiled[g_compiled_length++] = I_STA_ZPG;
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g_compiled[g_compiled_length++] = (uint8_t) &ptr1;
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g_compiled[g_compiled_length++] = I_STX_ZPG;
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g_compiled[g_compiled_length++] = (uint8_t) &ptr1 + 1;
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if (*s == ',') {
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s++;
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}
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// Parse value. LSB is in A.
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s = compile_expression(s);
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g_compiled[g_compiled_length++] = I_LDY_IMM;
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g_compiled[g_compiled_length++] = 0;
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g_compiled[g_compiled_length++] = I_STA_IND_Y;
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g_compiled[g_compiled_length++] = (uint8_t) &ptr1;
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} else {
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error = 1;
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}
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// Now we're at the end of our statement.
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if (!error) {
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if (*s == ':') {
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// Skip colon.
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s += 1;
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// Next statement.
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done = 0;
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} else if (*s != '\0') {
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// Junk at the end of the statement.
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error = 1;
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}
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}
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if (error) {
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add_call(syntax_error);
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}
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} while (!done);
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// Return from function.
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add_return();
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// Dump compiled buffer to the terminal.
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{
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int i;
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uint8_t *debug_port = (uint8_t *) 0xBFFE;
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debug_port[0] = g_compiled_length;
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for (i = 0; i < g_compiled_length; i++) {
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debug_port[1] = g_compiled[i];
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}
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}
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if (g_compiled_length > sizeof(g_compiled)) {
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// TODO: Check while adding bytes, not at the end.
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print("\n?Binary length exceeded");
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set_up_compile();
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// See if it's the "RUN" command, which we don't compile.
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if (g_input_buffer[0] == T_RUN) {
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compile_stored_program();
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} else {
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// Call it.
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g_compiled_function();
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// Compile the immediate mode line.
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compile_buffer(g_input_buffer);
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}
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complete_compile_and_execute();
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} else {
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// Stored mode. Add line to program.
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