home *** CD-ROM | disk | FTP | other *** search
- /* This module handles expression trees.
- Copyright (C) 1991 Free Software Foundation, Inc.
- Written by Steve Chamberlain of Cygnus Support (sac@cygnus.com).
-
- This file is part of GLD, the Gnu Linker.
-
- GLD is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- GLD is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GLD; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /*
- This module is in charge of working out the contents of expressions.
-
- It has to keep track of the relative/absness of a symbol etc. This is
- done by keeping all values in a struct (an etree_value_type) which
- contains a value, a section to which it is relative and a valid bit.
-
- */
-
-
- #include "bfd.h"
- #include "sysdep.h"
-
- #include "ld.h"
- #include "ldmain.h"
- #include "ldmisc.h"
- #include "ldexp.h"
- #include "ldgram.h"
- #include "ldsym.h"
- #include "ldlang.h"
-
- extern char *output_filename;
- extern unsigned int undefined_global_sym_count;
- extern unsigned int defined_global_sym_count;
- extern bfd *output_bfd;
- extern bfd_size_type largest_section;
- extern lang_statement_list_type file_chain;
- extern args_type command_line;
- extern ld_config_type config;
-
- extern lang_input_statement_type *script_file;
- extern unsigned int defined_global_sym_count;
- extern lang_output_section_statement_type *abs_output_section;
- extern bfd_vma print_dot;
-
-
- static void
- DEFUN(exp_print_token,( code),
- token_code_type code)
- {
- static CONST struct {
- token_code_type code;
- char *name;
- } table[] =
- {
- INT, "int",
- NAME,"NAME",
- PLUSEQ,"+=",
- MINUSEQ,"-=",
- MULTEQ,"*=",
- DIVEQ,"/=",
- LSHIFTEQ,"<<=",
- RSHIFTEQ,">>=",
- ANDEQ,"&=",
- OREQ,"|=",
- OROR,"||",
- ANDAND,"&&",
- EQ,"==",
- NE,"!=",
- LE,"<=",
- GE,">=",
- LSHIFT,"<<",
- RSHIFT,">>=",
- ALIGN_K,"ALIGN",
- BLOCK,"BLOCK",
- SECTIONS,"SECTIONS",
- SIZEOF_HEADERS,"SIZEOF_HEADERS",
- NEXT,"NEXT",
- SIZEOF,"SIZEOF",
- ADDR,"ADDR",
- MEMORY,"MEMORY",
-
-
-
-
-
- DEFINED,"DEFINED",
- TARGET_K,"TARGET",
- SEARCH_DIR,"SEARCH_DIR",
- MAP,"MAP",
- LONG,"LONG",
- SHORT,"SHORT",
- BYTE,"BYTE",
- ENTRY,"ENTRY",
- 0,(char *)NULL} ;
-
-
-
- unsigned int idx;
- for (idx = 0; table[idx].name != (char*)NULL; idx++) {
- if (table[idx].code == code) {
- fprintf(config.map_file, "%s", table[idx].name);
- return;
- }
- }
- /* Not in table, just print it alone */
- fprintf(config.map_file, "%c",code);
- }
-
- static void
- DEFUN(make_abs,(ptr),
- etree_value_type *ptr)
- {
- asection *s = ptr->section->bfd_section;
- ptr->value += s->vma;
- ptr->section = abs_output_section;
- }
-
- static
- DEFUN(etree_value_type new_abs,(value),
- bfd_vma value)
- {
-
-
- etree_value_type new;
- new.valid = true;
- new.section = abs_output_section;
- new.value = value;
- return new;
- }
-
- static void
- DEFUN(check, (os, name, op),
- lang_output_section_statement_type *os AND
- CONST char *name AND
- CONST char *op)
- {
- if (os == (lang_output_section_statement_type *)NULL) {
- einfo("%F%P %s uses undefined section %s\n", op, name);
- }
- if (os->processed == false) {
- einfo("%F%P %s forward reference of section %s\n",op, name);
- }
- }
-
- etree_type *
- DEFUN(exp_intop,(value),
- bfd_vma value)
- {
- etree_type *new = (etree_type *)stat_alloc((bfd_size_type)(sizeof(new->value)));
- new->type.node_code = INT;
- new->value.value = value;
- new->type.node_class = etree_value;
- return new;
-
- }
-
-
- static
- DEFUN(etree_value_type new_rel,(value, section),
- bfd_vma value AND
- lang_output_section_statement_type *section)
- {
- etree_value_type new;
- new.valid = true;
- new.value = value;
- new.section = section;
- return new;
- }
-
- static
- DEFUN(etree_value_type
- new_rel_from_section, (value, section),
- bfd_vma value AND
- lang_output_section_statement_type *section)
- {
- etree_value_type new;
- new.valid = true;
- new.value = value;
- new.section = section;
-
- new.value -= section->bfd_section->vma;
-
- return new;
- }
-
- static etree_value_type
- DEFUN(fold_binary,(tree, current_section, allocation_done, dot, dotp),
- etree_type *tree AND
- lang_output_section_statement_type *current_section AND
- lang_phase_type allocation_done AND
- bfd_vma dot AND
- bfd_vma *dotp)
- {
- etree_value_type result;
-
- result = exp_fold_tree(tree->binary.lhs, current_section,
- allocation_done, dot, dotp);
- if (result.valid) {
- etree_value_type other;
- other = exp_fold_tree(tree->binary.rhs,
- current_section,
- allocation_done, dot,dotp) ;
- if (other.valid) {
- /* If values are from different sections, or this is an */
- /* absolute expression, make both source args absolute */
- if (result.section != other.section ||
- current_section == abs_output_section)
- {
- make_abs(&result);
- make_abs(&other);
- }
-
- switch (tree->type.node_code)
- {
- case '%':
- /* Mod, both absolule*/
-
- if (other.value == 0) {
- einfo("%F%S % by zero\n");
- }
- result.value = (int)result.value % (int)other.value;
- break;
- case '/':
- if (other.value == 0) {
- einfo("%F%S / by zero\n");
- }
- result.value = (int)result.value / (int) other.value;
- break;
- #define BOP(x,y) case x : result.value = result.value y other.value;break;
- BOP('+',+);
- BOP('*',*);
- BOP('-',-);
- BOP(LSHIFT,<<);
- BOP(RSHIFT,>>);
- BOP(EQ,==);
- BOP(NE,!=);
- BOP('<',<);
- BOP('>',>);
- BOP(LE,<=);
- BOP(GE,>=);
- BOP('&',&);
- BOP('^',^);
- BOP('|',|);
- BOP(ANDAND,&&);
- BOP(OROR,||);
- default:
- FAIL();
- }
- }
- else {
- result.valid = false;
- }
- }
- return result;
- }
- etree_value_type
- DEFUN_VOID(invalid)
- {
- etree_value_type new;
- new.valid = false;
- return new;
- }
-
- etree_value_type
- DEFUN(fold_name, (tree, current_section, allocation_done, dot),
- etree_type *tree AND
- lang_output_section_statement_type *current_section AND
- lang_phase_type allocation_done AND
- bfd_vma dot)
- {
- etree_value_type result;
- switch (tree->type.node_code)
- {
- case SIZEOF_HEADERS:
- if (allocation_done != lang_first_phase_enum)
- {
- result = new_abs(bfd_sizeof_headers(output_bfd,
- config.relocateable_output));
-
- }
- else {
- result.valid = false;
- }
- break;
- case DEFINED:
- result.value =
- ldsym_get_soft(tree->name.name) != (ldsym_type *)NULL;
- result.section = 0;
- result.valid = true;
- break;
- case NAME:
- result.valid = false;
- if (tree->name.name[0] == '.' && tree->name.name[1] == 0) {
-
- if (allocation_done != lang_first_phase_enum) {
- result = new_rel_from_section(dot, current_section);
- }
- else {
- result = invalid();
- }
- }
- else {
- if (allocation_done == lang_final_phase_enum) {
- ldsym_type *sy = ldsym_get_soft(tree->name.name);
-
- if (sy) {
- asymbol **sdefp = sy->sdefs_chain;
-
- if (sdefp) {
- asymbol *sdef = *sdefp;
- #if 0
- if (sdef->section == (asection *)NULL) {
- /* This is an absolute symbol */
- result = new_abs(sdef->value);
- }
- else
- #endif
- {
- lang_output_section_statement_type *os =
- lang_output_section_statement_lookup(
- sdef->section->output_section->name);
- /* If the symbol is from a file which we are not
- relocating (-R) then return an absolute for its
- value */
- if (bfd_asymbol_bfd(sdef)->usrdata &&
- ((lang_input_statement_type*)(bfd_asymbol_bfd(sdef)->usrdata))->just_syms_flag == true)
- {
- result = new_abs(sdef->value +sdef->section->vma);
-
- }
- else {
- result = new_rel(sdef->value + sdef->section->output_offset, os);
- }
- }
- }
- }
- if (result.valid == false) {
- einfo("%F%S: undefined symbol `%s' referenced in expression.\n",
- tree->name.name);
- }
-
- }
- }
-
- break;
-
- case ADDR:
-
- if (allocation_done != lang_first_phase_enum) {
- lang_output_section_statement_type *os =
- lang_output_section_find(tree->name.name);
- check(os,tree->name.name,"ADDR");
- result = new_rel((bfd_vma)0, os);
- }
- else {
- result = invalid();
- }
- break;
- case SIZEOF:
- if(allocation_done != lang_first_phase_enum) {
- lang_output_section_statement_type *os =
- lang_output_section_find(tree->name.name);
- check(os,tree->name.name,"SIZEOF");
- result = new_abs((bfd_vma)(os->bfd_section->_raw_size));
- }
- else {
- result = invalid();
- }
- break;
-
- default:
- FAIL();
- break;
- }
-
- return result;
- }
- etree_value_type
- DEFUN(exp_fold_tree,(tree, current_section, allocation_done,
- dot, dotp),
- etree_type *tree AND
- lang_output_section_statement_type *current_section AND
- lang_phase_type allocation_done AND
- bfd_vma dot AND
- bfd_vma *dotp)
- {
- etree_value_type result;
-
- if (tree == (etree_type *)NULL) {
- result.valid = false;
- }
- else {
- switch (tree->type.node_class)
- {
- case etree_value:
- result = new_rel(tree->value.value, current_section);
- break;
- case etree_unary:
- result = exp_fold_tree(tree->unary.child,
- current_section,
- allocation_done, dot, dotp);
- if (result.valid == true)
- {
- switch(tree->type.node_code)
- {
- case ALIGN_K:
- if (allocation_done != lang_first_phase_enum) {
- result = new_rel_from_section(ALIGN_N(dot,
- result.value) ,
- current_section);
-
- }
- else {
- result.valid = false;
- }
- break;
- case ABSOLUTE:
- if (allocation_done != lang_first_phase_enum)
- {
- if (current_section
- == (lang_output_section_statement_type*)NULL)
- {
- /* Outside a section, so it's all ok */
-
- }
- else {
- /* Inside a section, subtract the base of the section,
- so when it's added again (in an assignment), everything comes out fine
- */
- result.section = abs_output_section;
- result.value -= current_section->bfd_section->vma;
- result.valid = 1;
- }
- }
- else
- {
- result.valid = false;
- }
-
- break;
- case '~':
- make_abs(&result);
- result.value = ~result.value;
- break;
- case '!':
- make_abs(&result);
- result.value = !result.value;
- break;
- case '-':
- make_abs(&result);
- result.value = -result.value;
- break;
- case NEXT:
- if (allocation_done ==lang_allocating_phase_enum) {
- make_abs(&result);
- result.value = ALIGN_N(dot, result.value);
- }
- else {
- /* Return next place aligned to value */
- result.valid = false;
- }
- break;
- default:
- FAIL();
- }
- }
-
- break;
- case etree_trinary:
-
- result = exp_fold_tree(tree->trinary.cond,
- current_section,
- allocation_done, dot, dotp);
- if (result.valid) {
- result = exp_fold_tree(result.value ?
- tree->trinary.lhs:tree->trinary.rhs,
- current_section,
- allocation_done, dot, dotp);
- }
-
- break;
- case etree_binary:
- result = fold_binary(tree, current_section, allocation_done,
- dot, dotp);
- break;
- case etree_assign:
- if (tree->assign.dst[0] == '.' && tree->assign.dst[1] == 0) {
- /* Assignment to dot can only be done during allocation */
- if (allocation_done == lang_allocating_phase_enum) {
- result = exp_fold_tree(tree->assign.src,
- current_section,
- lang_allocating_phase_enum, dot, dotp);
- if (result.valid == false) {
- einfo("%F%S invalid assignment to location counter\n");
- }
- else {
- if (current_section ==
- (lang_output_section_statement_type *)NULL) {
- einfo("%F%S assignment to location counter invalid outside of SECTION\n");
- }
- else {
- bfd_vma nextdot =result.value +
- current_section->bfd_section->vma;
- if (nextdot < dot) {
- einfo("%F%S cannot move location counter backwards (from %V to %V)\n", dot, nextdot);
- }
- else {
- *dotp = nextdot;
- }
- }
- }
- }
- }
- else {
- ldsym_type *sy = ldsym_get(tree->assign.dst);
-
- /* If this symbol has just been created then we'll place it into
- * a section of our choice
- */
- result = exp_fold_tree(tree->assign.src,
- current_section, allocation_done,
- dot, dotp);
- if (result.valid)
- {
- asymbol *def;
- asymbol **def_ptr ;
- /* Add this definition to script file */
- if (sy->sdefs_chain)
- {
- def_ptr = sy->sdefs_chain;
- def = *def_ptr;
-
- }
- else
- {
- def_ptr = (asymbol **)stat_alloc((bfd_size_type)(sizeof(asymbol **)));
- def = (asymbol *)bfd_make_empty_symbol(script_file->the_bfd);
-
-
- def->flags = 0;
-
- sy->sdefs_chain = def_ptr;
- *def_ptr = def;
- }
-
- def->value = result.value;
-
- def->section = result.section->bfd_section;
- def->flags = BSF_GLOBAL | BSF_EXPORT;
-
-
- def->udata = (PTR)NULL;
- def->name = sy->name;
-
- if (sy->sdefs_chain == 0)
- Q_enter_global_ref(def_ptr, sy->name);
- }
-
- }
-
-
- break;
- case etree_name:
- result = fold_name(tree, current_section, allocation_done, dot);
- break;
- default:
- einfo("%F%S Need more of these %d",tree->type.node_class );
-
- }
- }
-
- return result;
- }
-
-
- etree_value_type
- DEFUN(exp_fold_tree_no_dot,(tree, current_section, allocation_done),
- etree_type *tree AND
- lang_output_section_statement_type *current_section AND
- lang_phase_type allocation_done)
- {
- return exp_fold_tree(tree, current_section, allocation_done, (bfd_vma)
- 0, (bfd_vma *)NULL);
- }
-
- etree_type *
- DEFUN(exp_binop,(code, lhs, rhs),
- int code AND
- etree_type *lhs AND
- etree_type *rhs)
- {
- etree_type value, *new;
- etree_value_type r;
-
- value.type.node_code = code;
- value.binary.lhs = lhs;
- value.binary.rhs = rhs;
- value.type.node_class = etree_binary;
- r = exp_fold_tree_no_dot(&value,
- abs_output_section,
- lang_first_phase_enum );
- if (r.valid)
- {
- return exp_intop(r.value);
- }
- new = (etree_type *)stat_alloc((bfd_size_type)(sizeof(new->binary)));
- memcpy((char *)new, (char *)&value, sizeof(new->binary));
- return new;
- }
-
- etree_type *
- DEFUN(exp_trinop,(code, cond, lhs, rhs),
- int code AND
- etree_type *cond AND
- etree_type *lhs AND
- etree_type *rhs)
- {
- etree_type value, *new;
- etree_value_type r;
- value.type.node_code = code;
- value.trinary.lhs = lhs;
- value.trinary.cond = cond;
- value.trinary.rhs = rhs;
- value.type.node_class = etree_trinary;
- r= exp_fold_tree_no_dot(&value, (lang_output_section_statement_type
- *)NULL,lang_first_phase_enum);
- if (r.valid) {
- return exp_intop(r.value);
- }
- new = (etree_type *)stat_alloc((bfd_size_type)(sizeof(new->trinary)));
- memcpy((char *)new,(char *) &value, sizeof(new->trinary));
- return new;
- }
-
-
- etree_type *
- DEFUN(exp_unop,(code, child),
- int code AND
- etree_type *child)
- {
- etree_type value, *new;
-
- etree_value_type r;
- value.unary.type.node_code = code;
- value.unary.child = child;
- value.unary.type.node_class = etree_unary;
- r = exp_fold_tree_no_dot(&value,abs_output_section,
- lang_first_phase_enum);
- if (r.valid) {
- return exp_intop(r.value);
- }
- new = (etree_type *)stat_alloc((bfd_size_type)(sizeof(new->unary)));
- memcpy((char *)new, (char *)&value, sizeof(new->unary));
- return new;
- }
-
-
- etree_type *
- DEFUN(exp_nameop,(code, name),
- int code AND
- CONST char *name)
- {
-
- etree_type value, *new;
- etree_value_type r;
- value.name.type.node_code = code;
- value.name.name = name;
- value.name.type.node_class = etree_name;
-
-
- r = exp_fold_tree_no_dot(&value,
- (lang_output_section_statement_type *)NULL,
- lang_first_phase_enum);
- if (r.valid) {
- return exp_intop(r.value);
- }
- new = (etree_type *)stat_alloc((bfd_size_type)(sizeof(new->name)));
- memcpy((char *)new, (char *)&value, sizeof(new->name));
- return new;
-
- }
-
-
-
-
- etree_type *
- DEFUN(exp_assop,(code, dst, src),
- int code AND
- CONST char *dst AND
- etree_type *src)
- {
- etree_type value, *new;
-
- value.assign.type.node_code = code;
-
-
- value.assign.src = src;
- value.assign.dst = dst;
- value.assign.type.node_class = etree_assign;
-
- #if 0
- if (exp_fold_tree_no_dot(&value, &result)) {
- return exp_intop(result);
- }
- #endif
- new = (etree_type*)stat_alloc((bfd_size_type)(sizeof(new->assign)));
- memcpy((char *)new, (char *)&value, sizeof(new->assign));
- return new;
- }
-
- void
- DEFUN(exp_print_tree,(tree),
- etree_type *tree)
- {
- switch (tree->type.node_class) {
- case etree_value:
- print_address(tree->value.value);
- return;
-
- case etree_assign:
- #if 0
- if (tree->assign.dst->sdefs != (asymbol *)NULL){
- fprintf(config.map_file,"%s (%x) ",tree->assign.dst->name,
- tree->assign.dst->sdefs->value);
- }
- else {
- fprintf(config.map_file,"%s (UNDEFINED)",tree->assign.dst->name);
- }
- #endif
- fprintf(config.map_file,"%s ",tree->assign.dst);
- exp_print_token(tree->type.node_code);
- exp_print_tree(tree->assign.src);
- break;
- case etree_binary:
- fprintf(config.map_file,"(");
- exp_print_tree(tree->binary.lhs);
- exp_print_token(tree->type.node_code);
- exp_print_tree(tree->binary.rhs);
- fprintf(config.map_file,")");
- break;
- case etree_trinary:
- exp_print_tree(tree->trinary.cond);
- fprintf(config.map_file,"?");
- exp_print_tree(tree->trinary.lhs);
- fprintf(config.map_file,":");
- exp_print_tree(tree->trinary.rhs);
- break;
- case etree_unary:
- exp_print_token(tree->unary.type.node_code);
- if (tree->unary.child)
- {
-
- fprintf(config.map_file,"(");
- exp_print_tree(tree->unary.child);
- fprintf(config.map_file,")");
- }
-
- break;
- case etree_undef:
- fprintf(config.map_file,"????????");
- break;
- case etree_name:
- if (tree->type.node_code == NAME) {
- fprintf(config.map_file,"%s", tree->name.name);
- }
- else {
- exp_print_token(tree->type.node_code);
- if (tree->name.name)
- fprintf(config.map_file,"(%s)", tree->name.name);
- }
- break;
- default:
- FAIL();
- break;
- }
- }
-
-
-
-
- bfd_vma
- DEFUN(exp_get_vma,(tree, def, name, allocation_done),
- etree_type *tree AND
- bfd_vma def AND
- char *name AND
- lang_phase_type allocation_done)
- {
- etree_value_type r;
-
- if (tree != (etree_type *)NULL) {
- r = exp_fold_tree_no_dot(tree,
- abs_output_section,
- allocation_done);
- if (r.valid == false && name) {
- einfo("%F%S Nonconstant expression for %s\n",name);
- }
- return r.value;
- }
- else {
- return def;
- }
- }
-
- int
- DEFUN(exp_get_value_int,(tree,def,name, allocation_done),
- etree_type *tree AND
- int def AND
- char *name AND
- lang_phase_type allocation_done)
- {
- return (int)exp_get_vma(tree,(bfd_vma)def,name, allocation_done);
- }
-
-