* Makefile.in (CRTSTUFF_CFLAGS): Add -fno-unit-at-a-time

	(OBJS): Add callgraph.o
	(callgraph.o): New.
	* c-decl.c (expand_body_1): Break out from ...
	(expand_body): This one;  change calling convention
	(finish_function): Move some of expand_body logic here.
	(c_expand_deferred_function): Update call of expand_body
	(c_expand_stmt): Use c_expand_body_1.
	* c-lang.c (LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION): Define.
	* c-objc-commin.c (c_objc_common_finish_file): Use callgraph code.
	* c-tree.h (c_expand_body): Declare.
	* callgraph.c: New file.
	* flags.h (flag_unit_at_a_time): Declare.
	* langhooks.h (LANG_HOOKS_CALLGRAPH_LOWER_FUNCTION,
	LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION,
	LANG_HOOKS_CALLGRAPH_INITIALIZER): New macros.
	* langhooks.h (struct lang_hooks_for_callgraph): New.
	(struct lang_hooks): Add callgraph field.
	* toplev.c (flag_unit_at_a_time): New.
	(lang_independent_options): Add flag_unit_at_a_time.
	(process_options): Disable unit-at-a-time mode for frontends not
	supporting callgraph.
	* tree-inline.c (typedef struct inline_data): Add "decl"
	(expand_call_inline): Update callgraph.
	(optimize_inline_calls): Set id.decl.
	* tree.h (cgraph_finalize_function, cgraph_finalize_compilation_unit,
	cgraph_create_edges, dump_cgraph, cgraph_optimize, cgraph_remove_call
	cgraph_calls_p): Declare.
	* invoke.texi (-funit-at-a-time): Document


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@62789 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 11 insertions, 0 deletions

diff --git a/gcc/toplev.c b/gcc/toplev.c
index 38cff5b12d7..0e05323503e 100644
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -883,6 +883,10 @@ int flag_new_regalloc = 0;
 
 int flag_tracer = 0;
 
+/* Nonzero if we perform whole unit at a time compilation.  */
+
+int flag_unit_at_a_time = 0;
+
 /* Values of the -falign-* flags: how much to align labels in code.
    0 means `use default', 1 means `don't align'.
    For each variable, there is an _log variant which is the power
@@ -989,6 +993,8 @@ static const lang_independent_options f_options[] =
    N_("Optimize sibling and tail recursive calls") },
   {"tracer", &flag_tracer, 1,
    N_("Perform superblock formation via tail duplication") },
+  {"unit-at-a-time", &flag_unit_at_a_time, 1,
+   N_("Compile whole compilation unit at a time") },
   {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
    N_("When running CSE, follow jumps to their targets") },
   {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
@@ -5124,6 +5130,11 @@ process_options ()
   if (flag_asynchronous_unwind_tables)
     flag_unwind_tables = 1;
 
+  /* Disable unit-at-a-time mode for frontends not supporting callgraph
+     interface.  */
+  if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
+    flag_unit_at_a_time = 0;
+
   /* Warn about options that are not supported on this machine.  */
 #ifndef INSN_SCHEDULING
   if (flag_schedule_insns || flag_schedule_insns_after_reload)