mirror of
https://github.com/uffejakobsen/acme.git
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7cb100c480
Added CLI switch to change pseudoop prefix to '.' Fixed a bug in expression parser and added a warning. git-svn-id: https://svn.code.sf.net/p/acme-crossass/code-0/trunk@94 4df02467-bbd4-4a76-a152-e7ce94205b78
282 lines
8.9 KiB
C
282 lines
8.9 KiB
C
// ACME - a crossassembler for producing 6502/65c02/65816/65ce02 code.
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// Copyright (C) 1998-2017 Marco Baye
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// Have a look at "acme.c" for further info
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//
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// symbol stuff
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//
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// 22 Nov 2007 "warn on indented labels" is now a CLI switch
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// 25 Sep 2011 Fixed bug in !sl (colons in filename could be interpreted as EOS)
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// 23 Nov 2014 Added label output in VICE format
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#include "symbol.h"
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#include <stdio.h>
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#include "acme.h"
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#include "alu.h"
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#include "dynabuf.h"
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#include "global.h" // FIXME - remove when no longer needed
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#include "input.h"
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#include "output.h"
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#include "platform.h"
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#include "section.h"
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#include "tree.h"
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#include "typesystem.h"
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// variables
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struct rwnode *symbols_forest[256] = { NULL }; // because of 8-bit hash - must be (at least partially) pre-defined so array will be zeroed!
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// Dump symbol value and flags to dump file
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static void dump_one_symbol(struct rwnode *node, FILE *fd)
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{
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struct symbol *symbol = node->body;
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// output name
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if (config.warn_on_type_mismatch
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&& symbol->result.addr_refs == 1)
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fprintf(fd, "!addr");
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fprintf(fd, "\t%s", node->id_string);
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switch (symbol->result.flags & MVALUE_FORCEBITS) {
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case MVALUE_FORCE16:
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fprintf(fd, "+2\t= ");
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break;
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case MVALUE_FORCE16 | MVALUE_FORCE24:
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/*FALLTHROUGH*/
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case MVALUE_FORCE24:
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fprintf(fd, "+3\t= ");
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break;
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default:
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fprintf(fd, "\t= ");
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}
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if (symbol->result.flags & MVALUE_DEFINED) {
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if (symbol->result.flags & MVALUE_IS_FP)
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fprintf(fd, "%.30f", symbol->result.val.fpval); //FIXME %g
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else
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fprintf(fd, "$%x", (unsigned) symbol->result.val.intval);
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} else {
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fprintf(fd, " ?"); // TODO - maybe write "UNDEFINED" instead? then the file could at least be parsed without errors
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}
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if (symbol->result.flags & MVALUE_UNSURE)
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fprintf(fd, "\t; ?"); // TODO - write "forward" instead?
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if (symbol->usage == 0)
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fprintf(fd, "\t; unused");
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fprintf(fd, "\n");
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}
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// output symbols in VICE format (example: "al C:09ae .nmi1")
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static void dump_vice_address(struct rwnode *node, FILE *fd)
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{
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struct symbol *symbol = node->body;
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// dump address symbols even if they are not used
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if ((symbol->result.flags & MVALUE_DEFINED)
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&& !(symbol->result.flags & MVALUE_IS_FP)
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&& (symbol->result.addr_refs == 1))
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fprintf(fd, "al C:%04x .%s\n", (unsigned) symbol->result.val.intval, node->id_string);
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}
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static void dump_vice_usednonaddress(struct rwnode *node, FILE *fd)
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{
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struct symbol *symbol = node->body;
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// dump non-addresses that are used
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if (symbol->usage
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&& (symbol->result.flags & MVALUE_DEFINED)
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&& !(symbol->result.flags & MVALUE_IS_FP)
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&& (symbol->result.addr_refs != 1))
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fprintf(fd, "al C:%04x .%s\n", (unsigned) symbol->result.val.intval, node->id_string);
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}
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static void dump_vice_unusednonaddress(struct rwnode *node, FILE *fd)
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{
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struct symbol *symbol = node->body;
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// dump non-addresses that are unused
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if (!symbol->usage
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&& (symbol->result.flags & MVALUE_DEFINED)
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&& !(symbol->result.flags & MVALUE_IS_FP)
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&& (symbol->result.addr_refs != 1))
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fprintf(fd, "al C:%04x .%s\n", (unsigned) symbol->result.val.intval, node->id_string);
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}
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// search for symbol. create if nonexistant. if created, give it flags "flags".
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// the symbol name must be held in GlobalDynaBuf.
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struct symbol *symbol_find(scope_t scope, int flags)
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{
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struct rwnode *node;
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struct symbol *symbol;
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int node_created,
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force_bits = flags & MVALUE_FORCEBITS;
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node_created = Tree_hard_scan(&node, symbols_forest, scope, TRUE);
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// if node has just been created, create symbol as well
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if (node_created) {
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// create new symbol structure
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symbol = safe_malloc(sizeof(*symbol));
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// finish empty symbol item
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symbol->result.flags = flags;
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symbol->result.addr_refs = 0;
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if (flags & MVALUE_IS_FP)
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symbol->result.val.fpval = 0;
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else
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symbol->result.val.intval = 0;
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symbol->usage = 0; // usage count
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symbol->pass = pass_count;
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node->body = symbol;
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} else {
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symbol = node->body;
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}
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// make sure the force bits don't clash
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if ((node_created == FALSE) && force_bits)
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if ((symbol->result.flags & MVALUE_FORCEBITS) != force_bits)
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Throw_error("Too late for postfix.");
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return symbol;
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}
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// assign value to symbol. the function acts upon the symbol's flag bits and
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// produces an error if needed.
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void symbol_set_value(struct symbol *symbol, struct result *new_value, int change_allowed)
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{
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int oldflags = symbol->result.flags;
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// value stuff
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if ((oldflags & MVALUE_DEFINED) && (change_allowed == FALSE)) {
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// symbol is already defined, so compare new and old values
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// if different type OR same type but different value, complain
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if (((oldflags ^ new_value->flags) & MVALUE_IS_FP)
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|| ((oldflags & MVALUE_IS_FP) ? (symbol->result.val.fpval != new_value->val.fpval) : (symbol->result.val.intval != new_value->val.intval)))
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Throw_error("Symbol already defined.");
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} else {
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// symbol is not defined yet OR redefinitions are allowed
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symbol->result = *new_value;
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}
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// flags stuff
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// Ensure that "unsure" symbols without "isByte" state don't get that
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if ((oldflags & (MVALUE_UNSURE | MVALUE_ISBYTE)) == MVALUE_UNSURE)
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new_value->flags &= ~MVALUE_ISBYTE;
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if (change_allowed) {
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oldflags = (oldflags & MVALUE_UNSURE) | new_value->flags;
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} else {
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if ((oldflags & MVALUE_FORCEBITS) == 0)
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if ((oldflags & (MVALUE_UNSURE | MVALUE_DEFINED)) == 0)
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oldflags |= new_value->flags & MVALUE_FORCEBITS;
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oldflags |= new_value->flags & ~MVALUE_FORCEBITS;
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}
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symbol->result.flags = oldflags;
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}
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// parse label definition (can be either global or local).
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// name must be held in GlobalDynaBuf.
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void symbol_set_label(scope_t scope, int stat_flags, int force_bit, int change_allowed)
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{
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struct result pc,
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result;
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struct symbol *symbol;
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symbol = symbol_find(scope, force_bit);
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// label definition
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if ((stat_flags & SF_FOUND_BLANK) && config.warn_on_indented_labels)
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Throw_first_pass_warning("Label name not in leftmost column.");
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vcpu_read_pc(&pc);
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result.flags = pc.flags & MVALUE_DEFINED;
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result.val.intval = pc.val.intval;
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result.addr_refs = pc.addr_refs;
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symbol_set_value(symbol, &result, change_allowed);
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// global labels must open new scope for cheap locals
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if (scope == SCOPE_GLOBAL)
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section_new_cheap_scope(section_now);
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}
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// parse symbol definition (can be either global or local, may turn out to be a label).
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// name must be held in GlobalDynaBuf.
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void symbol_parse_definition(scope_t scope, int stat_flags)
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{
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struct result result;
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struct symbol *symbol;
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int force_bit = Input_get_force_bit(); // skips spaces after
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// FIXME - force bit is allowed for label definitions?!
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if (GotByte == '=') {
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// explicit symbol definition (symbol = <something>)
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symbol = symbol_find(scope, force_bit);
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// symbol = parsed value
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GetByte(); // skip '='
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ALU_any_result(&result);
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// if wanted, mark as address reference
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if (typesystem_says_address())
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result.addr_refs = 1;
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symbol_set_value(symbol, &result, FALSE);
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Input_ensure_EOS();
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} else {
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symbol_set_label(scope, stat_flags, force_bit, FALSE);
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}
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}
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// set global symbol to value, no questions asked (for "-D" switch)
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// Name must be held in GlobalDynaBuf.
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void symbol_define(intval_t value)
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{
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struct result result;
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struct symbol *symbol;
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result.flags = MVALUE_GIVEN;
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result.val.intval = value;
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symbol = symbol_find(SCOPE_GLOBAL, 0);
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symbol_set_value(symbol, &result, TRUE);
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}
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// dump global symbols to file
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void symbols_list(FILE *fd)
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{
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Tree_dump_forest(symbols_forest, SCOPE_GLOBAL, dump_one_symbol, fd);
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}
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void symbols_vicelabels(FILE *fd)
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{
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// FIXME - if type checking is enabled, maybe only output addresses?
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// the order of dumped labels is important because VICE will prefer later defined labels
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// dump unused labels
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Tree_dump_forest(symbols_forest, SCOPE_GLOBAL, dump_vice_unusednonaddress, fd);
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fputc('\n', fd);
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// dump other used labels
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Tree_dump_forest(symbols_forest, SCOPE_GLOBAL, dump_vice_usednonaddress, fd);
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fputc('\n', fd);
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// dump address symbols
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Tree_dump_forest(symbols_forest, SCOPE_GLOBAL, dump_vice_address, fd);
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}
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// fix name of anonymous forward label (held in DynaBuf, NOT TERMINATED!) so it
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// references the *next* anonymous forward label definition. The tricky bit is,
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// each name length would need its own counter. But hey, ACME's real quick in
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// finding symbols, so I'll just abuse the symbol system to store those counters.
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void symbol_fix_forward_anon_name(int increment)
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{
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struct symbol *counter_symbol;
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unsigned long number;
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// terminate name, find "counter" symbol and read value
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DynaBuf_append(GlobalDynaBuf, '\0');
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counter_symbol = symbol_find(section_now->local_scope, 0);
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// make sure it gets reset to zero in each new pass
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if (counter_symbol->pass != pass_count) {
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counter_symbol->pass = pass_count;
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counter_symbol->result.val.intval = 0;
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}
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number = (unsigned long) counter_symbol->result.val.intval;
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// now append to the name to make it unique
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GlobalDynaBuf->size--; // forget terminator, we want to append
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do {
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DYNABUF_APPEND(GlobalDynaBuf, 'a' + (number & 15));
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number >>= 4;
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} while (number);
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DynaBuf_append(GlobalDynaBuf, '\0');
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if (increment)
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counter_symbol->result.val.intval++;
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}
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