Fix -fopt-info for plugin passes

Attempts to dump via -fopt-info from a plugin pass fail, due
to the dfi->alt_state for such passes never being set.

This is because the -fopt-info options were being set up per-pass
during option-parsing (via gcc::dump_manager::opt_info_enable_passes),
but this data was not retained or used it for passes created later
(for plugins and target-specific passes).

This patch fixes the issue by storing the -fopt-info options into
gcc::dump_manager, refactoring the dfi-setup code out of
opt_info_enable_passes, and reusing it for such passes, fixing the
issue.  The patch adds a demo plugin to test that dumping from a
plugin works.

gcc/ChangeLog:
	* dumpfile.c (gcc::dump_manager::dump_manager): Initialize new
	fields.
	(gcc::dump_manager::~dump_manager): Free m_optinfo_filename.
	(gcc::dump_manager::register_pass): New member function, adapted
	from loop body in gcc::pass_manager::register_pass, adding a
	call to update_dfi_for_opt_info.
	(gcc::dump_manager::opt_info_enable_passes): Store the
	-fopt-info options into the new fields.  Move the loop
	bodies into...
	(gcc::dump_manager::update_dfi_for_opt_info): ...this new member
	function.
	* dumpfile.h (struct opt_pass): New forward decl.
	(gcc::dump_manager::register_pass): New decl.
	(gcc::dump_manager::update_dfi_for_opt_info): New decl.
	(class gcc::dump_manager): Add fields "m_optgroup_flags",
	"m_optinfo_flags", and "m_optinfo_filename".
	* passes.c (gcc::pass_manager::register_pass): Move all of the
	dump-handling code to gcc::dump_manager::register_pass.

gcc/testsuite/ChangeLog:
	* gcc.dg/plugin/dump-1.c: New test.
	* gcc.dg/plugin/dump_plugin.c: New test plugin.
	* gcc.dg/plugin/plugin.exp (plugin_test_list): Add the above.

From-SVN: r264844

1 files changed, 12 insertions, 0 deletions

diff --git a/gcc/dumpfile.h b/gcc/dumpfile.h
index 671b7b9..057ca46 100644
--- a/gcc/dumpfile.h
+++ b/gcc/dumpfile.h
@@ -566,6 +566,8 @@ extern void dump_combine_total_stats (FILE *);
 /* In cfghooks.c  */
 extern void dump_bb (FILE *, basic_block, int, dump_flags_t);
 
+struct opt_pass;
+
 namespace gcc {
 
 /* A class for managing all of the various dump files used by the
@@ -634,6 +636,8 @@ public:
   const char *
   dump_flag_name (int phase) const;
 
+  void register_pass (opt_pass *pass);
+
 private:
 
   int
@@ -649,6 +653,8 @@ private:
   opt_info_enable_passes (optgroup_flags_t optgroup_flags, dump_flags_t flags,
 			  const char *filename);
 
+  bool update_dfi_for_opt_info (dump_file_info *dfi) const;
+
 private:
 
   /* Dynamically registered dump files and switches.  */
@@ -657,6 +663,12 @@ private:
   size_t m_extra_dump_files_in_use;
   size_t m_extra_dump_files_alloced;
 
+  /* Stored values from -fopt-info, for handling passes created after
+     option-parsing (by backends and by plugins).  */
+  optgroup_flags_t m_optgroup_flags;
+  dump_flags_t m_optinfo_flags;
+  char *m_optinfo_filename;
+
   /* Grant access to dump_enable_all.  */
   friend bool ::enable_rtl_dump_file (void);