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Specialize partial_symtab for DWARF include files

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Include files are represented by a partial symtab, but don't expand to
anything.  From dwarf2_psymtab::expand_psymtab:

  if (per_cu == NULL)
    {
      /* It's an include file, no symbols to read for it.
         Everything is in the parent symtab.  */
      readin = true;
      return;
    }

This patch introduces a new specialization of partial_symtab to handle
this case.  In addition to being slightly smaller, I believe an
include file is the only situation where a DWARF psymtab can result in
a null compunit_symtab.  This adds an assert to that effect as well.
This change will simplify one of the psymtab sharing patches.

gdb/ChangeLog
2020-02-26  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (struct dwarf2_include_psymtab): New.
	(dwarf2_create_include_psymtab): Use dwarf2_include_psymtab.
	(dwarf2_psymtab::expand_psymtab, dwarf2_psymtab::readin_p)
	(dwarf2_psymtab::get_compunit_symtab): Remove null checks for
	per_cu_data.
This commit is contained in:
Tom Tromey 2020-02-26 15:41:07 -07:00
parent edfe0a0c65
commit b83470bfa7
2 changed files with 49 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
gdb/ChangeLog
View File

@ -1,3 +1,11 @@
2020-02-26 Tom Tromey <tom@tromey.com>
* dwarf2/read.c (struct dwarf2_include_psymtab): New.
(dwarf2_create_include_psymtab): Use dwarf2_include_psymtab.
(dwarf2_psymtab::expand_psymtab, dwarf2_psymtab::readin_p)
(dwarf2_psymtab::get_compunit_symtab): Remove null checks for
per_cu_data.
2020-02-26 Tom Tromey <tom@tromey.com>
* dwarf2/index-write.c (psym_index_map): Change type.

60
gdb/dwarf2/read.c
View File

@ -5918,6 +5918,44 @@ read_abbrev_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
return (sect_offset) read_offset (abfd, info_ptr, offset_size);
}
/* A partial symtab that is used only for include files. */
struct dwarf2_include_psymtab : public partial_symtab
{
dwarf2_include_psymtab (const char *filename, struct objfile *objfile)
: partial_symtab (filename, objfile)
{
}
void read_symtab (struct objfile *objfile) override
{
expand_psymtab (objfile);
}
void expand_psymtab (struct objfile *objfile) override
{
if (m_readin)
return;
/* It's an include file, no symbols to read for it.
Everything is in the parent symtab. */
read_dependencies (objfile);
m_readin = true;
}
bool readin_p () const override
{
return m_readin;
}
struct compunit_symtab *get_compunit_symtab () const override
{
return nullptr;
}
private:
bool m_readin = false;
};
/* Allocate a new partial symtab for file named NAME and mark this new
partial symtab as being an include of PST. */
@ -5925,7 +5963,7 @@ static void
dwarf2_create_include_psymtab (const char *name, dwarf2_psymtab *pst,
struct objfile *objfile)
{
dwarf2_psymtab *subpst = new dwarf2_psymtab (name, objfile);
dwarf2_include_psymtab *subpst = new dwarf2_include_psymtab (name, objfile);
if (!IS_ABSOLUTE_PATH (subpst->filename))
{
@ -5936,11 +5974,6 @@ dwarf2_create_include_psymtab (const char *name, dwarf2_psymtab *pst,
subpst->dependencies = objfile->partial_symtabs->allocate_dependencies (1);
subpst->dependencies[0] = pst;
subpst->number_of_dependencies = 1;
/* No private part is necessary for include psymtabs. This property
can be used to differentiate between such include psymtabs and
the regular ones. */
subpst->per_cu_data = nullptr;
}
/* Read the Line Number Program data and extract the list of files
@ -8851,24 +8884,13 @@ process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile)
void
dwarf2_psymtab::expand_psymtab (struct objfile *objfile)
{
struct dwarf2_per_cu_data *per_cu;
if (readin)
return;
read_dependencies (objfile);
per_cu = per_cu_data;
if (per_cu == NULL)
{
/* It's an include file, no symbols to read for it.
Everything is in the parent symtab. */
readin = true;
return;
}
dw2_do_instantiate_symtab (per_cu, false);
dw2_do_instantiate_symtab (per_cu_data, false);
gdb_assert (get_compunit_symtab () != nullptr);
}
/* Trivial hash function for die_info: the hash value of a DIE