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[PATCH 3/3] Introduce a separate debug objfile iterator
- From: Tom Tromey <tom at tromey dot com>
- To: gdb-patches at sourceware dot org
- Cc: Tom Tromey <tom at tromey dot com>
- Date: Tue, 9 Apr 2019 12:09:45 -0600
- Subject: [PATCH 3/3] Introduce a separate debug objfile iterator
- References: <20190409180945.21621-1-tom@tromey.com>
This introduces a new iterator and range adapter for iteration over
the separate debug files of a given objfile. As in the current
approach, the requested objfile is returned first, followed by the
separate debug objfiles.
gdb/ChangeLog
2019-04-09 Tom Tromey <tom@tromey.com>
* symtab.c (lookup_global_symbol_from_objfile)
(lookup_symbol_in_objfile_from_linkage_name): Use the iterator.
* objfiles.h (class separate_debug_iterator): New.
(class separate_debug_range): New.
(struct objfile) <separate_debug_objfiles>: New method.
(objfile_separate_debug_iterate): Don't declare.
* objfiles.c (separate_debug_iterator::operator++): Rename from
objfile_separate_debug_iterate.
(objfile_relocate, objfile_rebase, objfile_has_symbols): Use the
iterator.
* minsyms.c (lookup_minimal_symbol_by_pc_section): Use the
iterator.
---
gdb/ChangeLog | 15 +++++++++++
gdb/minsyms.c | 5 +---
gdb/objfiles.c | 67 ++++++++++++++++++++++++-------------------------
gdb/objfiles.h | 68 +++++++++++++++++++++++++++++++++++++++++++++++---
gdb/symtab.c | 12 +++------
5 files changed, 117 insertions(+), 50 deletions(-)
diff --git a/gdb/minsyms.c b/gdb/minsyms.c
index 34198d122dc..8037329a862 100644
--- a/gdb/minsyms.c
+++ b/gdb/minsyms.c
@@ -696,7 +696,6 @@ lookup_minimal_symbol_by_pc_section (CORE_ADDR pc_in, struct obj_section *sectio
int lo;
int hi;
int newobj;
- struct objfile *objfile;
struct minimal_symbol *msymbol;
struct minimal_symbol *best_symbol = NULL;
struct objfile *best_objfile = NULL;
@@ -722,9 +721,7 @@ lookup_minimal_symbol_by_pc_section (CORE_ADDR pc_in, struct obj_section *sectio
gdb_assert (section != NULL);
- for (objfile = section->objfile;
- objfile != NULL;
- objfile = objfile_separate_debug_iterate (section->objfile, objfile))
+ for (struct objfile *objfile : section->objfile->separate_debug_objfiles ())
{
CORE_ADDR pc = pc_in;
diff --git a/gdb/objfiles.c b/gdb/objfiles.c
index ada5edc42fa..71518ea5b24 100644
--- a/gdb/objfiles.c
+++ b/gdb/objfiles.c
@@ -446,44 +446,50 @@ entry_point_address (void)
return retval;
}
-/* Iterator on PARENT and every separate debug objfile of PARENT.
- The usage pattern is:
- for (objfile = parent;
- objfile;
- objfile = objfile_separate_debug_iterate (parent, objfile))
- ...
-*/
-
-struct objfile *
-objfile_separate_debug_iterate (const struct objfile *parent,
- const struct objfile *objfile)
+separate_debug_iterator &
+separate_debug_iterator::operator++ ()
{
+ gdb_assert (m_objfile != nullptr);
+
struct objfile *res;
/* If any, return the first child. */
- res = objfile->separate_debug_objfile;
+ res = m_objfile->separate_debug_objfile;
if (res)
- return res;
+ {
+ m_objfile = res;
+ return *this;
+ }
/* Common case where there is no separate debug objfile. */
- if (objfile == parent)
- return NULL;
+ if (m_objfile == m_parent)
+ {
+ m_objfile = nullptr;
+ return *this;
+ }
/* Return the brother if any. Note that we don't iterate on brothers of
the parents. */
- res = objfile->separate_debug_objfile_link;
+ res = m_objfile->separate_debug_objfile_link;
if (res)
- return res;
+ {
+ m_objfile = res;
+ return *this;
+ }
- for (res = objfile->separate_debug_objfile_backlink;
- res != parent;
+ for (res = m_objfile->separate_debug_objfile_backlink;
+ res != m_parent;
res = res->separate_debug_objfile_backlink)
{
gdb_assert (res != NULL);
if (res->separate_debug_objfile_link)
- return res->separate_debug_objfile_link;
+ {
+ m_objfile = res->separate_debug_objfile_link;
+ return *this;
+ }
}
- return NULL;
+ m_objfile = nullptr;
+ return *this;
}
/* Put one object file before a specified on in the global list.
@@ -860,15 +866,15 @@ void
objfile_relocate (struct objfile *objfile,
const struct section_offsets *new_offsets)
{
- struct objfile *debug_objfile;
int changed = 0;
changed |= objfile_relocate1 (objfile, new_offsets);
- for (debug_objfile = objfile->separate_debug_objfile;
- debug_objfile;
- debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile))
+ for (struct objfile *debug_objfile : objfile->separate_debug_objfiles ())
{
+ if (debug_objfile == objfile)
+ continue;
+
section_addr_info objfile_addrs
= build_section_addr_info_from_objfile (objfile);
@@ -917,14 +923,9 @@ objfile_rebase1 (struct objfile *objfile, CORE_ADDR slide)
void
objfile_rebase (struct objfile *objfile, CORE_ADDR slide)
{
- struct objfile *debug_objfile;
int changed = 0;
- changed |= objfile_rebase1 (objfile, slide);
-
- for (debug_objfile = objfile->separate_debug_objfile;
- debug_objfile;
- debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile))
+ for (struct objfile *debug_objfile : objfile->separate_debug_objfiles ())
changed |= objfile_rebase1 (debug_objfile, slide);
/* Relocate breakpoints as necessary, after things are relocated. */
@@ -965,9 +966,7 @@ objfile_has_full_symbols (struct objfile *objfile)
int
objfile_has_symbols (struct objfile *objfile)
{
- struct objfile *o;
-
- for (o = objfile; o; o = objfile_separate_debug_iterate (objfile, o))
+ for (struct objfile *o : objfile->separate_debug_objfiles ())
if (objfile_has_partial_symbols (o) || objfile_has_full_symbols (o))
return 1;
return 0;
diff --git a/gdb/objfiles.h b/gdb/objfiles.h
index 368d9f3abe2..168f7fc275b 100644
--- a/gdb/objfiles.h
+++ b/gdb/objfiles.h
@@ -318,6 +318,63 @@ struct objfile_per_bfd_storage
std::bitset<nr_languages> demangled_hash_languages;
};
+/* An iterator that first returns a parent objfile, and then each
+ separate debug objfile. */
+
+class separate_debug_iterator
+{
+public:
+
+ explicit separate_debug_iterator (struct objfile *objfile)
+ : m_objfile (objfile),
+ m_parent (objfile)
+ {
+ }
+
+ bool operator!= (const separate_debug_iterator &other)
+ {
+ return m_objfile != other.m_objfile;
+ }
+
+ separate_debug_iterator &operator++ ();
+
+ struct objfile *operator* ()
+ {
+ return m_objfile;
+ }
+
+private:
+
+ struct objfile *m_objfile;
+ struct objfile *m_parent;
+};
+
+/* A range adapter wrapping separate_debug_iterator. */
+
+class separate_debug_range
+{
+public:
+
+ explicit separate_debug_range (struct objfile *objfile)
+ : m_objfile (objfile)
+ {
+ }
+
+ separate_debug_iterator begin ()
+ {
+ return separate_debug_iterator (m_objfile);
+ }
+
+ separate_debug_iterator end ()
+ {
+ return separate_debug_iterator (nullptr);
+ }
+
+private:
+
+ struct objfile *m_objfile;
+};
+
/* Master structure for keeping track of each file from which
gdb reads symbols. There are several ways these get allocated: 1.
The main symbol file, symfile_objfile, set by the symbol-file command,
@@ -396,6 +453,14 @@ struct objfile
return msymbols_range (this);
}
+ /* Return a range adapter for iterating over all the separate debug
+ objfiles of this objfile. */
+
+ separate_debug_range separate_debug_objfiles ()
+ {
+ return separate_debug_range (this);
+ }
+
/* All struct objfile's are chained together by their next pointers.
The program space field "objfiles" (frequently referenced via
@@ -563,9 +628,6 @@ extern CORE_ADDR entry_point_address (void);
extern void build_objfile_section_table (struct objfile *);
-extern struct objfile *objfile_separate_debug_iterate (const struct objfile *,
- const struct objfile *);
-
extern void put_objfile_before (struct objfile *, struct objfile *);
extern void add_separate_debug_objfile (struct objfile *, struct objfile *);
diff --git a/gdb/symtab.c b/gdb/symtab.c
index d25f560f084..16e641a830b 100644
--- a/gdb/symtab.c
+++ b/gdb/symtab.c
@@ -2246,11 +2246,7 @@ lookup_global_symbol_from_objfile (struct objfile *main_objfile,
const char *name,
const domain_enum domain)
{
- struct objfile *objfile;
-
- for (objfile = main_objfile;
- objfile;
- objfile = objfile_separate_debug_iterate (main_objfile, objfile))
+ for (struct objfile *objfile : main_objfile->separate_debug_objfiles ())
{
struct block_symbol result
= lookup_symbol_in_objfile (objfile, GLOBAL_BLOCK, name, domain);
@@ -2327,7 +2323,7 @@ lookup_symbol_in_objfile_from_linkage_name (struct objfile *objfile,
domain_enum domain)
{
enum language lang = current_language->la_language;
- struct objfile *main_objfile, *cur_objfile;
+ struct objfile *main_objfile;
demangle_result_storage storage;
const char *modified_name = demangle_for_lookup (linkage_name, lang, storage);
@@ -2337,9 +2333,7 @@ lookup_symbol_in_objfile_from_linkage_name (struct objfile *objfile,
else
main_objfile = objfile;
- for (cur_objfile = main_objfile;
- cur_objfile;
- cur_objfile = objfile_separate_debug_iterate (main_objfile, cur_objfile))
+ for (struct objfile *cur_objfile : main_objfile->separate_debug_objfiles ())
{
struct block_symbol result;
--
2.17.2