/* This module handles expression trees.
- Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
- 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
- Free Software Foundation, Inc.
+ Copyright (C) 1991-2017 Free Software Foundation, Inc.
Written by Steve Chamberlain of Cygnus Support <sac@cygnus.com>.
This file is part of the GNU Binutils.
struct ldexp_control expld;
+/* This structure records symbols for which we need to keep track of
+ definedness for use in the DEFINED () test. It is also used in
+ making absolute symbols section relative late in the link. */
+
+struct definedness_hash_entry
+{
+ struct bfd_hash_entry root;
+
+ /* If this symbol was assigned from "dot" outside of an output
+ section statement, the section we'd like it relative to. */
+ asection *final_sec;
+
+ /* Symbol was defined by an object file. */
+ unsigned int by_object : 1;
+
+ /* Symbols was defined by a script. */
+ unsigned int by_script : 1;
+
+ /* Low bit of iteration count. Symbols with matching iteration have
+ been defined in this pass over the script. */
+ unsigned int iteration : 1;
+};
+
+static struct bfd_hash_table definedness_table;
+
/* Print the string representation of the given token. Surround it
with spaces if INFIX_P is TRUE. */
static const struct
{
token_code_type code;
- const char * name;
+ const char *name;
}
table[] =
{
{ GE, ">=" },
{ LSHIFT, "<<" },
{ RSHIFT, ">>" },
+ { LOG2CEIL, "LOG2CEIL" },
{ ALIGN_K, "ALIGN" },
{ BLOCK, "BLOCK" },
{ QUAD, "QUAD" },
}
static void
+make_log2ceil (void)
+{
+ bfd_vma value = expld.result.value;
+ bfd_vma result = -1;
+ bfd_boolean round_up = FALSE;
+
+ do
+ {
+ result++;
+ /* If more than one bit is set in the value we will need to round up. */
+ if ((value > 1) && (value & 1))
+ round_up = TRUE;
+ }
+ while (value >>= 1);
+
+ if (round_up)
+ result += 1;
+ expld.result.section = NULL;
+ expld.result.value = result;
+}
+
+static void
make_abs (void)
{
if (expld.result.section != NULL)
expld.result.value += expld.result.section->vma;
expld.result.section = bfd_abs_section_ptr;
+ expld.rel_from_abs = FALSE;
}
static void
static void
new_rel_from_abs (bfd_vma value)
{
+ asection *s = expld.section;
+
+ expld.rel_from_abs = TRUE;
expld.result.valid_p = TRUE;
- expld.result.value = value - expld.section->vma;
+ expld.result.value = value - s->vma;
expld.result.str = NULL;
- expld.result.section = expld.section;
+ expld.result.section = s;
+}
+
+/* New-function for the definedness hash table. */
+
+static struct bfd_hash_entry *
+definedness_newfunc (struct bfd_hash_entry *entry,
+ struct bfd_hash_table *table ATTRIBUTE_UNUSED,
+ const char *name ATTRIBUTE_UNUSED)
+{
+ struct definedness_hash_entry *ret = (struct definedness_hash_entry *) entry;
+
+ if (ret == NULL)
+ ret = (struct definedness_hash_entry *)
+ bfd_hash_allocate (table, sizeof (struct definedness_hash_entry));
+
+ if (ret == NULL)
+ einfo (_("%P%F: bfd_hash_allocate failed creating symbol %s\n"), name);
+
+ ret->by_object = 0;
+ ret->by_script = 0;
+ ret->iteration = 0;
+ return &ret->root;
+}
+
+/* Called during processing of linker script script expressions.
+ For symbols assigned in a linker script, return a struct describing
+ where the symbol is defined relative to the current expression,
+ otherwise return NULL. */
+
+static struct definedness_hash_entry *
+symbol_defined (const char *name)
+{
+ return ((struct definedness_hash_entry *)
+ bfd_hash_lookup (&definedness_table, name, FALSE, FALSE));
+}
+
+/* Update the definedness state of NAME. Return FALSE if script symbol
+ is multiply defining a strong symbol in an object. */
+
+static bfd_boolean
+update_definedness (const char *name, struct bfd_link_hash_entry *h)
+{
+ bfd_boolean ret;
+ struct definedness_hash_entry *defentry
+ = (struct definedness_hash_entry *)
+ bfd_hash_lookup (&definedness_table, name, TRUE, FALSE);
+
+ if (defentry == NULL)
+ einfo (_("%P%F: bfd_hash_lookup failed creating symbol %s\n"), name);
+
+ /* If the symbol was already defined, and not by a script, then it
+ must be defined by an object file or by the linker target code. */
+ ret = TRUE;
+ if (!defentry->by_script
+ && (h->type == bfd_link_hash_defined
+ || h->type == bfd_link_hash_defweak
+ || h->type == bfd_link_hash_common))
+ {
+ defentry->by_object = 1;
+ if (h->type == bfd_link_hash_defined
+ && h->u.def.section->output_section != NULL
+ && !h->linker_def)
+ ret = FALSE;
+ }
+
+ defentry->by_script = 1;
+ defentry->iteration = lang_statement_iteration;
+ defentry->final_sec = bfd_abs_section_ptr;
+ if (expld.phase == lang_final_phase_enum
+ && expld.rel_from_abs
+ && expld.result.section == bfd_abs_section_ptr)
+ defentry->final_sec = section_for_dot ();
+ return ret;
}
static void
make_abs ();
break;
+ case LOG2CEIL:
+ make_log2ceil ();
+ break;
+
case '~':
expld.result.value = ~expld.result.value;
break;
}
}
+/* Arithmetic operators, bitwise AND, bitwise OR and XOR keep the
+ section of one of their operands only when the other operand is a
+ plain number. Losing the section when operating on two symbols,
+ ie. a result of a plain number, is required for subtraction and
+ XOR. It's justifiable for the other operations on the grounds that
+ adding, multiplying etc. two section relative values does not
+ really make sense unless they are just treated as numbers.
+ The same argument could be made for many expressions involving one
+ symbol and a number. For example, "1 << x" and "100 / x" probably
+ should not be given the section of x. The trouble is that if we
+ fuss about such things the rules become complex and it is onerous
+ to document ld expression evaluation. */
+static void
+arith_result_section (const etree_value_type *lhs)
+{
+ if (expld.result.section == lhs->section)
+ {
+ if (expld.section == bfd_abs_section_ptr
+ && !config.sane_expr)
+ /* Duplicate the insanity in exp_fold_tree_1 case etree_value. */
+ expld.result.section = bfd_abs_section_ptr;
+ else
+ expld.result.section = NULL;
+ }
+}
+
static void
fold_binary (etree_type *tree)
{
/* Check to see if the user has overridden the default
value. */
segment_name = tree->binary.rhs->name.name;
- for (seg = segments; seg; seg = seg->next)
+ for (seg = segments; seg; seg = seg->next)
if (strcmp (seg->name, segment_name) == 0)
{
if (!seg->used
&& config.magic_demand_paged
&& (seg->value % config.maxpagesize) != 0)
- einfo (_("%P: warning: address of `%s' isn't multiple of maximum page size\n"),
+ einfo (_("%P: warning: address of `%s' "
+ "isn't multiple of maximum page size\n"),
segment_name);
seg->used = TRUE;
new_rel_from_abs (seg->value);
switch (tree->type.node_code)
{
- /* Arithmetic operators, bitwise AND, bitwise OR and XOR
- keep the section of one of their operands only when the
- other operand is a plain number. Losing the section when
- operating on two symbols, ie. a result of a plain number,
- is required for subtraction and XOR. It's justifiable
- for the other operations on the grounds that adding,
- multiplying etc. two section relative values does not
- really make sense unless they are just treated as
- numbers.
- The same argument could be made for many expressions
- involving one symbol and a number. For example,
- "1 << x" and "100 / x" probably should not be given the
- section of x. The trouble is that if we fuss about such
- things the rules become complex and it is onerous to
- document ld expression evaluation. */
#define BOP(x, y) \
case x: \
expld.result.value = lhs.value y expld.result.value; \
- if (expld.result.section == lhs.section) \
- expld.result.section = NULL; \
+ arith_result_section (&lhs); \
break;
/* Comparison operators, logical AND, and logical OR always
% (bfd_signed_vma) expld.result.value);
else if (expld.phase != lang_mark_phase_enum)
einfo (_("%F%S %% by zero\n"), tree->binary.rhs);
- if (expld.result.section == lhs.section)
- expld.result.section = NULL;
+ arith_result_section (&lhs);
break;
case '/':
/ (bfd_signed_vma) expld.result.value);
else if (expld.phase != lang_mark_phase_enum)
einfo (_("%F%S / by zero\n"), tree->binary.rhs);
- if (expld.result.section == lhs.section)
- expld.result.section = NULL;
+ arith_result_section (&lhs);
break;
case MAX_K:
else if (expld.dataseg.phase == exp_dataseg_none)
{
expld.dataseg.phase = exp_dataseg_align_seen;
- expld.dataseg.min_base = expld.dot;
expld.dataseg.base = expld.result.value;
expld.dataseg.pagesize = commonpage;
expld.dataseg.maxpagesize = maxpage;
break;
case DATA_SEGMENT_RELRO_END:
+ /* Operands swapped! DATA_SEGMENT_RELRO_END(offset,exp)
+ has offset in expld.result and exp in lhs. */
expld.dataseg.relro = exp_dataseg_relro_end;
+ expld.dataseg.relro_offset = expld.result.value;
if (expld.phase == lang_first_phase_enum
|| expld.section != bfd_abs_section_ptr)
expld.result.valid_p = FALSE;
break;
case DEFINED:
- if (expld.phase == lang_first_phase_enum)
- lang_track_definedness (tree->name.name);
- else
+ if (expld.phase != lang_first_phase_enum)
{
struct bfd_link_hash_entry *h;
- int def_iteration
- = lang_symbol_definition_iteration (tree->name.name);
+ struct definedness_hash_entry *def;
h = bfd_wrapped_link_hash_lookup (link_info.output_bfd,
&link_info,
&& (h->type == bfd_link_hash_defined
|| h->type == bfd_link_hash_defweak
|| h->type == bfd_link_hash_common)
- && (def_iteration == lang_statement_iteration
- || def_iteration == -1));
+ && ((def = symbol_defined (tree->name.name)) == NULL
+ || def->by_object
+ || def->iteration == (lang_statement_iteration & 1)));
}
break;
case NAME:
+ if (expld.assign_name != NULL
+ && strcmp (expld.assign_name, tree->name.name) == 0)
+ {
+ /* Self-assignment is only allowed for absolute symbols
+ defined in a linker script. */
+ struct bfd_link_hash_entry *h;
+ struct definedness_hash_entry *def;
+
+ h = bfd_wrapped_link_hash_lookup (link_info.output_bfd,
+ &link_info,
+ tree->name.name,
+ FALSE, FALSE, TRUE);
+ if (!(h != NULL
+ && (h->type == bfd_link_hash_defined
+ || h->type == bfd_link_hash_defweak)
+ && h->u.def.section == bfd_abs_section_ptr
+ && (def = symbol_defined (tree->name.name)) != NULL
+ && def->iteration == (lang_statement_iteration & 1)))
+ expld.assign_name = NULL;
+ }
if (expld.phase == lang_first_phase_enum)
;
else if (tree->name.name[0] == '.' && tree->name.name[1] == 0)
/ bfd_octets_per_byte (link_info.output_bfd));
else
val = (bfd_vma)1 << os->bfd_section->alignment_power;
-
+
new_number (val);
}
else
case LENGTH:
{
- lang_memory_region_type *mem;
-
- mem = lang_memory_region_lookup (tree->name.name, FALSE);
- if (mem != NULL)
- new_number (mem->length);
- else
- einfo (_("%F%S: undefined MEMORY region `%s'"
- " referenced in expression\n"),
- tree, tree->name.name);
+ if (expld.phase != lang_first_phase_enum)
+ {
+ lang_memory_region_type *mem;
+
+ mem = lang_memory_region_lookup (tree->name.name, FALSE);
+ if (mem != NULL)
+ new_number (mem->length);
+ else
+ einfo (_("%F%S: undefined MEMORY region `%s'"
+ " referenced in expression\n"),
+ tree, tree->name.name);
+ }
}
break;
if (expld.phase != lang_first_phase_enum)
{
lang_memory_region_type *mem;
-
- mem = lang_memory_region_lookup (tree->name.name, FALSE);
- if (mem != NULL)
+
+ mem = lang_memory_region_lookup (tree->name.name, FALSE);
+ if (mem != NULL)
new_rel_from_abs (mem->origin);
- else
+ else
einfo (_("%F%S: undefined MEMORY region `%s'"
" referenced in expression\n"),
tree, tree->name.name);
}
}
+/* Return true if TREE is '.'. */
+
+static bfd_boolean
+is_dot (const etree_type *tree)
+{
+ return (tree->type.node_class == etree_name
+ && tree->type.node_code == NAME
+ && tree->name.name[0] == '.'
+ && tree->name.name[1] == 0);
+}
+
+/* Return true if TREE is a constant equal to VAL. */
+
+static bfd_boolean
+is_value (const etree_type *tree, bfd_vma val)
+{
+ return (tree->type.node_class == etree_value
+ && tree->value.value == val);
+}
+
+/* Return true if TREE is an absolute symbol equal to VAL defined in
+ a linker script. */
+
+static bfd_boolean
+is_sym_value (const etree_type *tree, bfd_vma val)
+{
+ struct bfd_link_hash_entry *h;
+ struct definedness_hash_entry *def;
+
+ return (tree->type.node_class == etree_name
+ && tree->type.node_code == NAME
+ && (def = symbol_defined (tree->name.name)) != NULL
+ && def->by_script
+ && def->iteration == (lang_statement_iteration & 1)
+ && (h = bfd_wrapped_link_hash_lookup (link_info.output_bfd,
+ &link_info,
+ tree->name.name,
+ FALSE, FALSE, TRUE)) != NULL
+ && h->type == bfd_link_hash_defined
+ && h->u.def.section == bfd_abs_section_ptr
+ && h->u.def.value == val);
+}
+
+/* Return true if TREE is ". != 0". */
+
+static bfd_boolean
+is_dot_ne_0 (const etree_type *tree)
+{
+ return (tree->type.node_class == etree_binary
+ && tree->type.node_code == NE
+ && is_dot (tree->binary.lhs)
+ && is_value (tree->binary.rhs, 0));
+}
+
+/* Return true if TREE is ". = . + 0" or ". = . + sym" where sym is an
+ absolute constant with value 0 defined in a linker script. */
+
+static bfd_boolean
+is_dot_plus_0 (const etree_type *tree)
+{
+ return (tree->type.node_class == etree_binary
+ && tree->type.node_code == '+'
+ && is_dot (tree->binary.lhs)
+ && (is_value (tree->binary.rhs, 0)
+ || is_sym_value (tree->binary.rhs, 0)));
+}
+
+/* Return true if TREE is "ALIGN (. != 0 ? some_expression : 1)". */
+
+static bfd_boolean
+is_align_conditional (const etree_type *tree)
+{
+ if (tree->type.node_class == etree_unary
+ && tree->type.node_code == ALIGN_K)
+ {
+ tree = tree->unary.child;
+ return (tree->type.node_class == etree_trinary
+ && is_dot_ne_0 (tree->trinary.cond)
+ && is_value (tree->trinary.rhs, 1));
+ }
+ return FALSE;
+}
+
+/* Subroutine of exp_fold_tree_1 for copying a symbol type. */
+
+static void
+try_copy_symbol_type (struct bfd_link_hash_entry *h, etree_type *src)
+{
+ struct bfd_link_hash_entry *hsrc;
+
+ hsrc = bfd_link_hash_lookup (link_info.hash, src->name.name,
+ FALSE, FALSE, TRUE);
+ if (hsrc != NULL)
+ bfd_copy_link_hash_symbol_type (link_info.output_bfd, h, hsrc);
+}
+
static void
exp_fold_tree_1 (etree_type *tree)
{
exp_fold_tree_1 (tree->assign.src);
expld.assigning_to_dot = FALSE;
- if (!expld.result.valid_p)
+ /* If we are assigning to dot inside an output section
+ arrange to keep the section, except for certain
+ expressions that evaluate to zero. We ignore . = 0,
+ . = . + 0, and . = ALIGN (. != 0 ? expr : 1).
+ We can't ignore all expressions that evaluate to zero
+ because an otherwise empty section might have padding
+ added by an alignment expression that changes with
+ relaxation. Such a section might have zero size
+ before relaxation and so be stripped incorrectly. */
+ if (expld.phase == lang_mark_phase_enum
+ && expld.section != bfd_abs_section_ptr
+ && expld.section != bfd_und_section_ptr
+ && !(expld.result.valid_p
+ && expld.result.value == 0
+ && (is_value (tree->assign.src, 0)
+ || is_sym_value (tree->assign.src, 0)
+ || is_dot_plus_0 (tree->assign.src)
+ || is_align_conditional (tree->assign.src))))
+ expld.section->flags |= SEC_KEEP;
+
+ if (!expld.result.valid_p
+ || expld.section == bfd_und_section_ptr)
{
if (expld.phase != lang_mark_phase_enum)
einfo (_("%F%S invalid assignment to"
}
else
{
- etree_type *name;
-
struct bfd_link_hash_entry *h = NULL;
if (tree->type.node_class == etree_provide)
h = bfd_link_hash_lookup (link_info.hash, tree->assign.dst,
FALSE, FALSE, TRUE);
if (h == NULL
- || (h->type != bfd_link_hash_new
- && h->type != bfd_link_hash_undefined
- && h->type != bfd_link_hash_common))
+ || !(h->type == bfd_link_hash_new
+ || h->type == bfd_link_hash_undefined
+ || h->type == bfd_link_hash_undefweak
+ || h->linker_def))
{
- /* Do nothing. The symbol was never referenced, or was
- defined by some object. */
+ /* Do nothing. The symbol was never referenced, or
+ was defined in some object file. Note that
+ undefweak symbols are defined by PROVIDE. This
+ is to support glibc use of __rela_iplt_start and
+ similar weak references. */
break;
}
}
- name = tree->assign.src;
- if (name->type.node_class == etree_trinary)
- {
- exp_fold_tree_1 (name->trinary.cond);
- if (expld.result.valid_p)
- name = (expld.result.value
- ? name->trinary.lhs : name->trinary.rhs);
- }
-
- if (name->type.node_class == etree_name
- && name->type.node_code == NAME
- && strcmp (tree->assign.dst, name->name.name) == 0)
- /* Leave it alone. Do not replace a symbol with its own
- output address, in case there is another section sizing
- pass. Folding does not preserve input sections. */
- break;
-
+ expld.assign_name = tree->assign.dst;
exp_fold_tree_1 (tree->assign.src);
- if (expld.result.valid_p
+ /* expld.assign_name remaining equal to tree->assign.dst
+ below indicates the evaluation of tree->assign.src did
+ not use the value of tree->assign.dst. We don't allow
+ self assignment until the final phase for two reasons:
+ 1) Expressions are evaluated multiple times. With
+ relaxation, the number of times may vary.
+ 2) Section relative symbol values cannot be correctly
+ converted to absolute values, as is required by many
+ expressions, until final section sizing is complete. */
+ if ((expld.result.valid_p
+ && (expld.phase == lang_final_phase_enum
+ || expld.assign_name != NULL))
|| (expld.phase <= lang_mark_phase_enum
&& tree->type.node_class == etree_assign
- && tree->assign.hidden))
+ && tree->assign.defsym))
{
if (h == NULL)
{
tree->assign.dst);
}
- /* FIXME: Should we worry if the symbol is already
- defined? */
- lang_update_definedness (tree->assign.dst, h);
- h->type = bfd_link_hash_defined;
- h->u.def.value = expld.result.value;
if (expld.result.section == NULL)
expld.result.section = expld.section;
+ if (!update_definedness (tree->assign.dst, h) && 0)
+ {
+ /* Symbol was already defined. For now this error
+ is disabled because it causes failures in the ld
+ testsuite: ld-elf/var1, ld-scripts/defined5, and
+ ld-scripts/pr14962. Some of these no doubt
+ reflect scripts used in the wild. */
+ (*link_info.callbacks->multiple_definition)
+ (&link_info, h, link_info.output_bfd,
+ expld.result.section, expld.result.value);
+ }
+ h->type = bfd_link_hash_defined;
+ h->u.def.value = expld.result.value;
h->u.def.section = expld.result.section;
+ h->linker_def = ! tree->assign.type.lineno;
+ h->ldscript_def = 1;
if (tree->type.node_class == etree_provide)
tree->type.node_class = etree_provided;
/* Copy the symbol type if this is a simple assignment of
- one symbol to another. This could be more general
- (e.g. a ?: operator with NAMEs in each branch). */
+ one symbol to another. Also, handle the case of a foldable
+ ternary conditional with names on either side. */
if (tree->assign.src->type.node_class == etree_name)
+ try_copy_symbol_type (h, tree->assign.src);
+ else if (tree->assign.src->type.node_class == etree_trinary)
{
- struct bfd_link_hash_entry *hsrc;
-
- hsrc = bfd_link_hash_lookup (link_info.hash,
- tree->assign.src->name.name,
- FALSE, FALSE, TRUE);
- if (hsrc)
- bfd_copy_link_hash_symbol_type (link_info.output_bfd, h,
- hsrc);
+ exp_fold_tree_1 (tree->assign.src->trinary.cond);
+ if (expld.result.valid_p)
+ {
+ if (expld.result.value
+ && tree->assign.src->trinary.lhs->type.node_class
+ == etree_name)
+ try_copy_symbol_type (h, tree->assign.src->trinary.lhs);
+
+ if (!expld.result.value
+ && tree->assign.src->trinary.rhs->type.node_class
+ == etree_name)
+ try_copy_symbol_type (h, tree->assign.src->trinary.rhs);
+ }
}
}
else if (expld.phase == lang_final_phase_enum)
&& h->type == bfd_link_hash_new)
h->type = bfd_link_hash_undefined;
}
+ expld.assign_name = NULL;
}
break;
void
exp_fold_tree (etree_type *tree, asection *current_section, bfd_vma *dotp)
{
+ expld.rel_from_abs = FALSE;
expld.dot = *dotp;
expld.dotp = dotp;
expld.section = current_section;
void
exp_fold_tree_no_dot (etree_type *tree)
{
+ expld.rel_from_abs = FALSE;
expld.dot = 0;
expld.dotp = NULL;
expld.section = bfd_abs_section_ptr;
exp_fold_tree_1 (tree);
}
-etree_type *
-exp_binop (int code, etree_type *lhs, etree_type *rhs)
+static void
+exp_value_fold (etree_type *tree)
{
- etree_type value, *new_e;
-
- value.type.node_code = code;
- value.type.filename = lhs->type.filename;
- value.type.lineno = lhs->type.lineno;
- value.binary.lhs = lhs;
- value.binary.rhs = rhs;
- value.type.node_class = etree_binary;
- exp_fold_tree_no_dot (&value);
+ exp_fold_tree_no_dot (tree);
if (expld.result.valid_p)
- return exp_intop (expld.result.value);
+ {
+ tree->type.node_code = INT;
+ tree->value.value = expld.result.value;
+ tree->value.str = NULL;
+ tree->type.node_class = etree_value;
+ }
+}
+
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
- new_e = (etree_type *) stat_alloc (sizeof (new_e->binary));
- memcpy (new_e, &value, sizeof (new_e->binary));
+etree_type *
+exp_binop (int code, etree_type *lhs, etree_type *rhs)
+{
+ etree_type *new_e = (etree_type *) stat_alloc (MAX (sizeof (new_e->binary),
+ sizeof (new_e->value)));
+ new_e->type.node_code = code;
+ new_e->type.filename = lhs->type.filename;
+ new_e->type.lineno = lhs->type.lineno;
+ new_e->binary.lhs = lhs;
+ new_e->binary.rhs = rhs;
+ new_e->type.node_class = etree_binary;
+ if (lhs->type.node_class == etree_value
+ && rhs->type.node_class == etree_value
+ && code != ALIGN_K
+ && code != DATA_SEGMENT_ALIGN
+ && code != DATA_SEGMENT_RELRO_END)
+ exp_value_fold (new_e);
return new_e;
}
etree_type *
exp_trinop (int code, etree_type *cond, etree_type *lhs, etree_type *rhs)
{
- etree_type value, *new_e;
-
- value.type.node_code = code;
- value.type.filename = cond->type.filename;
- value.type.lineno = cond->type.lineno;
- value.trinary.lhs = lhs;
- value.trinary.cond = cond;
- value.trinary.rhs = rhs;
- value.type.node_class = etree_trinary;
- exp_fold_tree_no_dot (&value);
- if (expld.result.valid_p)
- return exp_intop (expld.result.value);
-
- new_e = (etree_type *) stat_alloc (sizeof (new_e->trinary));
- memcpy (new_e, &value, sizeof (new_e->trinary));
+ etree_type *new_e = (etree_type *) stat_alloc (MAX (sizeof (new_e->trinary),
+ sizeof (new_e->value)));
+ new_e->type.node_code = code;
+ new_e->type.filename = cond->type.filename;
+ new_e->type.lineno = cond->type.lineno;
+ new_e->trinary.lhs = lhs;
+ new_e->trinary.cond = cond;
+ new_e->trinary.rhs = rhs;
+ new_e->type.node_class = etree_trinary;
+ if (cond->type.node_class == etree_value
+ && lhs->type.node_class == etree_value
+ && rhs->type.node_class == etree_value)
+ exp_value_fold (new_e);
return new_e;
}
etree_type *
exp_unop (int code, etree_type *child)
{
- etree_type value, *new_e;
-
- value.unary.type.node_code = code;
- value.unary.type.filename = child->type.filename;
- value.unary.type.lineno = child->type.lineno;
- value.unary.child = child;
- value.unary.type.node_class = etree_unary;
- exp_fold_tree_no_dot (&value);
- if (expld.result.valid_p)
- return exp_intop (expld.result.value);
-
- new_e = (etree_type *) stat_alloc (sizeof (new_e->unary));
- memcpy (new_e, &value, sizeof (new_e->unary));
+ etree_type *new_e = (etree_type *) stat_alloc (MAX (sizeof (new_e->unary),
+ sizeof (new_e->value)));
+ new_e->unary.type.node_code = code;
+ new_e->unary.type.filename = child->type.filename;
+ new_e->unary.type.lineno = child->type.lineno;
+ new_e->unary.child = child;
+ new_e->unary.type.node_class = etree_unary;
+ if (child->type.node_class == etree_value
+ && code != ALIGN_K
+ && code != ABSOLUTE
+ && code != NEXT
+ && code != DATA_SEGMENT_END)
+ exp_value_fold (new_e);
return new_e;
}
etree_type *
exp_nameop (int code, const char *name)
{
- etree_type value, *new_e;
-
- value.name.type.node_code = code;
- value.name.type.filename = ldlex_filename ();
- value.name.type.lineno = lineno;
- value.name.name = name;
- value.name.type.node_class = etree_name;
+ etree_type *new_e = (etree_type *) stat_alloc (sizeof (new_e->name));
- exp_fold_tree_no_dot (&value);
- if (expld.result.valid_p)
- return exp_intop (expld.result.value);
-
- new_e = (etree_type *) stat_alloc (sizeof (new_e->name));
- memcpy (new_e, &value, sizeof (new_e->name));
+ new_e->name.type.node_code = code;
+ new_e->name.type.filename = ldlex_filename ();
+ new_e->name.type.lineno = lineno;
+ new_e->name.name = name;
+ new_e->name.type.node_class = etree_name;
return new_e;
}
exp_assop (const char *dst,
etree_type *src,
enum node_tree_enum class,
+ bfd_boolean defsym,
bfd_boolean hidden)
{
etree_type *n;
n->assign.type.node_class = class;
n->assign.src = src;
n->assign.dst = dst;
+ n->assign.defsym = defsym;
n->assign.hidden = hidden;
return n;
}
+/* Handle linker script assignments and HIDDEN. */
+
etree_type *
-exp_assign (const char *dst, etree_type *src)
+exp_assign (const char *dst, etree_type *src, bfd_boolean hidden)
{
- return exp_assop (dst, src, etree_assign, FALSE);
+ return exp_assop (dst, src, etree_assign, FALSE, hidden);
}
+/* Handle --defsym command-line option. */
+
etree_type *
exp_defsym (const char *dst, etree_type *src)
{
- return exp_assop (dst, src, etree_assign, TRUE);
+ return exp_assop (dst, src, etree_assign, TRUE, FALSE);
}
/* Handle PROVIDE. */
etree_type *
exp_provide (const char *dst, etree_type *src, bfd_boolean hidden)
{
- return exp_assop (dst, src, etree_provide, hidden);
+ return exp_assop (dst, src, etree_provide, FALSE, hidden);
}
/* Handle ASSERT. */
value = (value + align - 1) / align;
return value * align;
}
+
+void
+ldexp_init (void)
+{
+ /* The value "13" is ad-hoc, somewhat related to the expected number of
+ assignments in a linker script. */
+ if (!bfd_hash_table_init_n (&definedness_table,
+ definedness_newfunc,
+ sizeof (struct definedness_hash_entry),
+ 13))
+ einfo (_("%P%F: can not create hash table: %E\n"));
+}
+
+/* Convert absolute symbols defined by a script from "dot" (also
+ SEGMENT_START or ORIGIN) outside of an output section statement,
+ to section relative. */
+
+static bfd_boolean
+set_sym_sections (struct bfd_hash_entry *bh, void *inf ATTRIBUTE_UNUSED)
+{
+ struct definedness_hash_entry *def = (struct definedness_hash_entry *) bh;
+ if (def->final_sec != bfd_abs_section_ptr)
+ {
+ struct bfd_link_hash_entry *h;
+ h = bfd_link_hash_lookup (link_info.hash, bh->string,
+ FALSE, FALSE, TRUE);
+ if (h != NULL
+ && h->type == bfd_link_hash_defined
+ && h->u.def.section == bfd_abs_section_ptr)
+ {
+ h->u.def.value -= def->final_sec->vma;
+ h->u.def.section = def->final_sec;
+ }
+ }
+ return TRUE;
+}
+
+void
+ldexp_finalize_syms (void)
+{
+ bfd_hash_traverse (&definedness_table, set_sym_sections, NULL);
+}
+
+void
+ldexp_finish (void)
+{
+ bfd_hash_table_free (&definedness_table);
+}