void i_generate_return P1(struct parse_node *, node) {
if (node) {
i_generate_node(node);
} else {
ins_f_byte(F_CONST0);
}
ins_f_byte(F_RETURN);
}
void
i_generate_inherited_init_call P2(int, index, short, f) {
ins_f_byte(F_CALL_INHERITED);
ins_byte(index);
ins_short(f);
ins_byte(0);
ins_f_byte(F_POP_VALUE);
}
void i_generate_continue() {
if (switches) {
ins_f_byte(F_POP_BREAK);
ins_byte(switches);
}
/* form a linked list of the continue addresses */
ins_f_byte(F_BRANCH);
ins_short(cont_ptr->line);
cont_ptr = cont_ptr->v.expr;
}
void
i_branch_backwards P2(char, b, int, addr) {
if (b) {
ins_f_byte(b);
ins_short(CURRENT_PROGRAM_SIZE - addr);
}
}
static void
generate_lvalue_list P1(struct parse_node *, expr) {
while (expr = expr->r.expr) {
i_generate_node(expr->l.expr);
ins_f_byte(F_VOID_ASSIGN);
}
}
/*
* Generate the code to push a number on the stack.
* This varies since there are several opcodes (for
* optimizing speed and/or size).
*/
static void write_number P1(int, val)
{
if (val == 0) {
ins_f_byte(F_CONST0);
} else if (val == 1) {
ins_f_byte(F_CONST1);
} else if (val > 0 && val < 256) {
ins_f_byte(F_BYTE);
ins_byte(val);
} else if (val < 0 && val > -256) {
ins_f_byte(F_NBYTE);
ins_byte(-val);
} else {
ins_f_byte(F_NUMBER);
ins_int(val);
}
}
void
i_generate_else() {
/* set up a new branch to after the end of the if */
ins_f_byte(F_BRANCH);
/* save the old saved value here */
ins_short(read_short(current_forward_branch));
/* update the old branch to point to this point */
upd_short(current_forward_branch, CURRENT_PROGRAM_SIZE - current_forward_branch);
/* point current_forward_branch at the new branch we made */
current_forward_branch = CURRENT_PROGRAM_SIZE - 2;
}
void i_generate_forward_branch P1(char, b) {
ins_f_byte(b);
ins_short(current_forward_branch);
current_forward_branch = CURRENT_PROGRAM_SIZE - 2;
}
void
i_pop_value() {
ins_f_byte(F_POP_VALUE);
}
void
i_generate_function_call P2(short, f, char, num) {
ins_f_byte(F_CALL_FUNCTION_BY_ADDRESS);
ins_short(f);
ins_byte(0);
}
void
i_generate_node P1(struct parse_node *, expr) {
if (!expr) return;
if (expr->line && expr->line != line_being_generated)
switch_to_line(expr->line);
switch (expr->kind) {
case F_OR:
case F_XOR:
case F_AND:
case F_EQ:
case F_NE:
case F_GT:
case F_GE:
case F_LT:
case F_LE:
case F_LSH:
case F_RSH:
case F_ADD:
case F_SUBTRACT:
case F_MULTIPLY:
case F_DIVIDE:
case F_MOD:
i_generate_node(expr->l.expr);
/* fall through */
case F_RETURN:
case F_POP_VALUE:
case F_PRE_INC:
case F_PRE_DEC:
case F_INC:
case F_DEC:
case F_POST_INC:
case F_POST_DEC:
case F_NOT:
case F_COMPL:
case F_NEGATE:
i_generate_node(expr->r.expr);
/* fall through */
case F_CONST0:
case F_CONST1:
#ifdef DEBUG
case F_BREAK_POINT:
#endif
case F_BREAK:
ins_f_byte(expr->kind);
break;
case F_ASSIGN: /* note these are backwards */
case F_VOID_ASSIGN:
case F_VOID_ADD_EQ:
case F_ADD_EQ:
case F_AND_EQ:
case F_OR_EQ:
case F_XOR_EQ:
case F_LSH_EQ:
case F_RSH_EQ:
case F_SUB_EQ:
case F_MULT_EQ:
case F_MOD_EQ:
case F_DIV_EQ:
case F_INDEX_LVALUE:
case F_INDEX:
case F_RINDEX:
case F_RINDEX_LVALUE:
i_generate_node(expr->r.expr);
i_generate_node(expr->l.expr);
ins_f_byte(expr->kind);
break;
case F_NN_RANGE:
case F_RN_RANGE:
case F_RR_RANGE:
case F_NR_RANGE:
case F_NN_RANGE_LVALUE:
case F_RN_RANGE_LVALUE:
case F_NR_RANGE_LVALUE:
case F_RR_RANGE_LVALUE:
i_generate_node(expr->l.expr);
i_generate_node(expr->r.expr);
i_generate_node(expr->v.expr);
ins_f_byte(expr->kind);
break;
case NODE_NE_RANGE_LVALUE:
i_generate_node(expr->l.expr);
ins_f_byte(F_CONST1);
i_generate_node(expr->v.expr);
ins_f_byte(F_NR_RANGE_LVALUE);
break;
case NODE_RE_RANGE_LVALUE:
i_generate_node(expr->l.expr);
ins_f_byte(F_CONST1);
i_generate_node(expr->v.expr);
ins_f_byte(F_RR_RANGE_LVALUE);
break;
case F_RE_RANGE:
case F_NE_RANGE:
i_generate_node(expr->l.expr);
i_generate_node(expr->v.expr);
ins_f_byte(expr->kind);
break;
case F_STRING:
if (expr->v.number <= 0xff) {
ins_f_byte(F_SHORT_STRING);
ins_byte(expr->v.number);
} else {
ins_f_byte(F_STRING);
ins_short(expr->v.number);
}
break;
case F_REAL:
ins_f_byte(F_REAL);
ins_real(expr->v.real);
break;
case F_NBYTE:
case F_BYTE:
ins_f_byte(expr->kind);
ins_byte(expr->v.number);
break;
case F_NUMBER:
write_number(expr->v.number);
break;
case F_LOR:
case F_LAND:
i_generate_node(expr->l.expr);
i_generate_forward_branch(expr->kind);
i_generate_node(expr->r.expr);
if (expr->l.expr->kind == NODE_BRANCH_LINK){
i_update_forward_branch_links(expr->kind,expr->l.expr);
}
else i_update_forward_branch();
break;
case NODE_BRANCH_LINK:
i_generate_node(expr->l.expr);
ins_byte(0);
expr->line = CURRENT_PROGRAM_SIZE;
ins_short(0);
i_generate_node(expr->r.expr);
break;
case F_AGGREGATE:
case F_AGGREGATE_ASSOC:
generate_expr_list(expr->r.expr);
ins_f_byte(expr->kind);
ins_short(expr->v.number);
break;
case NODE_COMMA:
case NODE_ASSOC:
i_generate_node(expr->l.expr);
i_generate_node(expr->r.expr);
break;
case NODE_BREAK:
ins_f_byte(F_BRANCH);
expr->v.expr = break_ptr;
expr->line = CURRENT_PROGRAM_SIZE;
expr->type = 0;
ins_short(0);
break_ptr = expr;
break;
case NODE_CONTINUE:
if (switches) {
ins_f_byte(F_POP_BREAK);
ins_byte(switches);
}
ins_f_byte(F_BRANCH);
expr->v.expr = cont_ptr;
expr->line = CURRENT_PROGRAM_SIZE;
expr->type = 0;
ins_short(0);
cont_ptr = expr;
break;
case NODE_STATEMENTS:
i_generate_node(expr->l.expr);
i_generate_node(expr->r.expr);
break;
case NODE_PARAMETER:
ins_f_byte(F_LOCAL);
ins_byte(expr->v.number + current_num_values);
break;
case NODE_PARAMETER_LVALUE:
ins_f_byte(F_LOCAL_LVALUE);
ins_byte(expr->v.number + current_num_values);
break;
case NODE_VALUE:
ins_f_byte(F_LOCAL);
ins_byte(expr->v.number);
break;
case NODE_LVALUE:
ins_f_byte(F_LOCAL_LVALUE);
ins_byte(expr->v.number);
break;
case NODE_IF:
if (expr->v.expr->kind == F_NOT) {
i_generate_node(expr->v.expr->r.expr);
i_generate_forward_branch(F_BRANCH_WHEN_NON_ZERO);
} else {
i_generate_node(expr->v.expr);
i_generate_forward_branch(F_BRANCH_WHEN_ZERO);
}
i_generate_node(expr->l.expr);
if (expr->r.expr) {
i_generate_else();
i_generate_node(expr->r.expr);
}
i_update_forward_branch();
break;
case NODE_FOR:
{
int forever = node_always_true(expr->l.expr->v.expr), pos;
i_save_loop_info();
i_generate_node(expr->l.expr->l.expr);
if (!forever)
i_generate_forward_branch(F_BRANCH);
pos = CURRENT_PROGRAM_SIZE;
i_generate_node(expr->r.expr);
i_update_continues();
i_generate_node(expr->l.expr->r.expr);
if (!forever)
i_update_forward_branch();
if (expr->l.expr->v.expr->kind == F_LOOP_COND){
i_generate_node(expr->l.expr->v.expr);
ins_short(CURRENT_PROGRAM_SIZE - pos);
} else
i_branch_backwards(generate_conditional_branch(expr->l.expr->v.expr), pos);
i_update_breaks();
i_restore_loop_info();
}
break;
case NODE_WHILE:
{
int forever = node_always_true(expr->l.expr), pos;
i_save_loop_info();
if (!forever)
i_generate_forward_branch(F_BRANCH);
pos = CURRENT_PROGRAM_SIZE;
i_generate_node(expr->r.expr);
if (!forever)
i_update_forward_branch();
i_update_continues();
if (expr->l.expr->kind == F_LOOP_COND){
i_generate_node(expr->l.expr);
ins_short(CURRENT_PROGRAM_SIZE - pos);
} else
i_branch_backwards(generate_conditional_branch(expr->l.expr), pos);
i_update_breaks();
i_restore_loop_info();
}
break;
case NODE_DO_WHILE:
{
int pos;
i_save_loop_info();
pos = CURRENT_PROGRAM_SIZE;
i_generate_node(expr->l.expr);
i_update_continues();
i_branch_backwards(generate_conditional_branch(expr->r.expr), pos);
i_update_breaks();
i_restore_loop_info();
}
break;
case NODE_CASE_NUMBER:
case NODE_CASE_STRING:
if (expr->v.expr) {
struct parse_node *other = expr->v.expr;
expr->v.number = 1;
other->l.expr = expr->l.expr;
other->v.number = CURRENT_PROGRAM_SIZE;
expr->l.expr = other;
} else {
expr->v.number = CURRENT_PROGRAM_SIZE;
}
break;
case NODE_DEFAULT:
expr->v.number = CURRENT_PROGRAM_SIZE;
break;
case NODE_SWITCH_STRINGS:
case NODE_SWITCH_NUMBERS:
case NODE_SWITCH_DIRECT:
{
int addr;
i_generate_node(expr->l.expr);
switches++;
ins_f_byte(F_SWITCH);
ins_byte(0xff); /* kind of table */
addr = CURRENT_PROGRAM_SIZE;
ins_short(0); /* address of table */
ins_short(0); /* break address to push, table is entered before */
ins_short(0); /* default address */
i_generate_node(expr->r.expr);
if (expr->v.expr && expr->v.expr->kind == NODE_DEFAULT) {
upd_short(addr + 4, expr->v.expr->v.number);
expr->v.expr = expr->v.expr->l.expr;
} else {
upd_short(addr + 4, CURRENT_PROGRAM_SIZE);
}
/* just in case the last case doesn't have a break */
ins_f_byte(F_BREAK);
/* build table */
upd_short(addr, CURRENT_PROGRAM_SIZE);
#ifdef BINARIES
if (expr->kind == NODE_SWITCH_STRINGS) {
short sw;
sw = addr - 2;
add_to_mem_block(A_PATCH, (char *)&sw, sizeof sw);
}
#endif
if (expr->kind == NODE_SWITCH_DIRECT) {
struct parse_node *pn = expr->v.expr;
while (pn) {
ins_short((short)pn->v.number);
pn = pn->l.expr;
}
ins_int(expr->v.expr->r.number);
mem_block[current_block].block[addr-1] = (char)0xfe;
} else {
int table_size = 0;
int power_of_two = 1;
int i = 0;
struct parse_node *pn = expr->v.expr;
while (pn) {
INS_POINTER((POINTER_INT)pn->r.expr);
ins_short((short)pn->v.number);
pn = pn->l.expr;
table_size += 1;
}
while ((power_of_two<<1) <= table_size) {
power_of_two <<= 1;
i++;
}
if (expr->kind == NODE_SWITCH_NUMBERS)
mem_block[current_block].block[addr-1] = (char)(0xf0+i);
else
mem_block[current_block].block[addr-1] = (char)(i*0x10+0x0f);
}
upd_short(addr + 2, CURRENT_PROGRAM_SIZE);
break;
}
case NODE_CONDITIONAL:
{
int addr;
i_generate_node(expr->l.expr);
ins_f_byte(F_BRANCH_WHEN_ZERO);
addr = CURRENT_PROGRAM_SIZE;
ins_short(0);
i_generate_node(expr->r.expr->l.expr);
upd_short(addr, CURRENT_PROGRAM_SIZE - addr + 3); /*over the branch */
ins_f_byte(F_BRANCH);
addr = CURRENT_PROGRAM_SIZE;
ins_short(0);
i_generate_node(expr->r.expr->r.expr);
upd_short(addr, CURRENT_PROGRAM_SIZE - addr);
}
break;
case F_CATCH:
{
int addr;
ins_f_byte(F_CATCH);
addr = CURRENT_PROGRAM_SIZE;
ins_short(0);
i_generate_node(expr->r.expr);
ins_f_byte(F_END_CATCH);
upd_short(addr, CURRENT_PROGRAM_SIZE - addr);
break;
}
case F_SSCANF:
i_generate_node(expr->l.expr->l.expr);
i_generate_node(expr->l.expr->r.expr);
ins_f_byte(F_SSCANF);
ins_byte(expr->r.expr->v.number);
generate_lvalue_list(expr->r.expr);
break;
case F_PARSE_COMMAND:
i_generate_node(expr->l.expr->l.expr);
i_generate_node(expr->l.expr->r.expr->l.expr);
i_generate_node(expr->l.expr->r.expr->r.expr);
ins_f_byte(F_PARSE_COMMAND);
ins_byte(expr->r.expr->v.number);
generate_lvalue_list(expr->r.expr);
break;
case F_TIME_EXPRESSION:
ins_f_byte(F_TIME_EXPRESSION);
i_generate_node(expr->r.expr);
ins_f_byte(F_END_TIME_EXPRESSION);
break;
case F_TO_FLOAT:
case F_TO_INT:
generate_expr_list(expr->r.expr);
ins_f_byte(expr->kind);
break;
case F_GLOBAL_LVALUE:
case F_GLOBAL:
case F_LOCAL_LVALUE:
case F_LOCAL:
case F_LOOP_INCR:
case F_WHILE_DEC:
ins_f_byte(expr->kind);
ins_byte(expr->v.number);
break;
case F_LOOP_COND:
{
int i;
ins_f_byte(F_LOOP_COND);
ins_byte(expr->l.expr->v.number);
/* expand this into a number so we can pull it fast at runtime */
if (expr->r.expr->kind == F_LOCAL) {
i_generate_node(expr->r.expr);
} else {
ins_f_byte(F_NUMBER);
switch (expr->r.expr->kind) {
case F_CONST0: i = 0; break;
case F_CONST1: i = 1; break;
case F_NBYTE: i = - expr->r.expr->v.number; break;
case F_BYTE:
case F_NUMBER:
i = expr->r.expr->v.number; break;
default:
fatal("Unknown node %i in F_LOOP_COND\n", expr->r.expr->kind);
}
ins_int(i);
}
break;
}
case F_SIMUL_EFUN:
case F_CALL_FUNCTION_BY_ADDRESS:
generate_expr_list(expr->r.expr);
ins_f_byte(expr->kind);
ins_short(expr->v.number);
ins_byte((expr->r.expr ? expr->r.expr->kind : 0));
break;
case F_CALL_INHERITED:
generate_expr_list(expr->r.expr);
ins_f_byte(F_CALL_INHERITED);
ins_byte(expr->v.number & 0xff);
ins_short(expr->v.number >> 8);
ins_byte((expr->r.expr ? expr->r.expr->kind : 0));
break;
case F_EVALUATE:
#ifdef NEW_FUNCTIONS
generate_expr_list(expr->r.expr);
ins_f_byte(F_EVALUATE);
#else
i_generate_node(expr->l.expr);
ins_f_byte(F_EVALUATE);
generate_expr_list(expr->r.expr);
ins_f_byte(F_CALL_OTHER);
#endif
ins_byte(expr->v.number);
break;
case F_FUNCTION_CONSTRUCTOR:
#ifdef NEW_FUNCTIONS
if ((expr->v.number & 0xff) == FP_CALL_OTHER) {
i_generate_node(expr->l.expr);
i_generate_node(expr->r.expr);
ins_f_byte(F_FUNCTION_CONSTRUCTOR);
ins_f_byte(FP_CALL_OTHER);
break;
}
if (expr->r.expr) {
generate_expr_list(expr->r.expr);
ins_f_byte(F_AGGREGATE);
ins_short(expr->r.expr->kind);
} else
ins_f_byte(F_CONST0);
ins_f_byte(F_FUNCTION_CONSTRUCTOR);
ins_byte(expr->v.number & 0xff);
switch (expr->v.number & 0xff) {
case FP_SIMUL:
case FP_LOCAL:
ins_short(expr->v.number >> 8);
break;
case FP_EFUN:
ins_f_byte(predefs[expr->v.number >> 8].token);
break;
case FP_FUNCTIONAL:
case FP_FUNCTIONAL | FP_NOT_BINDABLE:
{
int addr, save_current_num_values = current_num_values;
ins_byte(expr->v.number >> 8);
addr = CURRENT_PROGRAM_SIZE;
ins_short(0);
current_num_values = expr->r.expr ? expr->r.expr->kind : 0;
i_generate_node(expr->l.expr);
current_num_values = save_current_num_values;
ins_f_byte(F_RETURN);
upd_short(addr, CURRENT_PROGRAM_SIZE - addr - 2);
break;
}
}
#else
if (expr->l.expr) i_generate_node(expr->l.expr);
i_generate_node(expr->r.expr);
ins_f_byte(F_FUNCTION_CONSTRUCTOR);
ins_byte(expr->v.number);
#endif
break;
#ifdef NEW_FUNCTIONS
case NODE_ANON_FUNC:
{
int addr;
ins_f_byte(F_FUNCTION_CONSTRUCTOR);
ins_byte(FP_ANONYMOUS);
ins_byte(expr->v.number);
ins_byte(expr->l.number);
addr = CURRENT_PROGRAM_SIZE;
ins_short(0);
i_generate_node(expr->r.expr);
upd_short(addr, CURRENT_PROGRAM_SIZE - addr - 2);
break;
}
#endif
default:
DEBUG_CHECK1(expr->kind < BASE,
"Unknown eoperator %s in i_generate_node.\n",
get_f_name(expr->kind));
generate_expr_list(expr->r.expr);
ins_f_byte(expr->kind);
if (expr->v.number != -1)
ins_byte(expr->v.number);
}
}
void ins_f_byte_with_arg(unsigned int a, INT32 b)
{
ins_f_byte(a);
add_to_program((PIKE_OPCODE_T)b);
}
