Add function_abi.{h,cc}

This patch adds new structures and functions for handling
multiple ABIs in a translation unit.  The structures are:

- predefined_function_abi: describes a static, predefined ABI
- function_abi: describes either a predefined ABI or a local
  variant of one (e.g. taking -fipa-ra into account)

The patch adds functions for getting the ABI from a given type
or decl; a later patch will also add a function for getting the
ABI of the target of a call insn.

Although ABIs are about much more than call-clobber/saved choices,
I wanted to keep the name general in case we add more ABI-related
information in future.

2019-09-30  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* Makefile.in (OBJS): Add function-abi.o.
	(GTFILES): Add function-abi.h.
	* function-abi.cc: New file.
	* function-abi.h: Likewise.
	* emit-rtl.h (rtl_data::abi): New field.
	* function.c: Include function-abi.h.
	(prepare_function_start): Initialize crtl->abi.
	* read-rtl-function.c: Include regs.h and function-abi.h.
	(read_rtl_function_body): Initialize crtl->abi.
	(read_rtl_function_body_from_file_range): Likewise.
	* reginfo.c: Include function-abi.h.
	(init_reg_sets_1): Initialize default_function_abi.
	(globalize_reg): Call add_full_reg_clobber for each predefined ABI
	when making a register global.
	* target-globals.h (this_target_function_abi_info): Declare.
	(target_globals::function_abi_info): New field.
	(restore_target_globals): Copy it.
	* target-globals.c: Include function-abi.h.
	(default_target_globals): Initialize the function_abi_info field.
	(target_globals): Allocate it.
	(save_target_globals): Free it.

From-SVN: r276307

1 files changed, 3 insertions, 0 deletions

diff --git a/gcc/target-globals.h b/gcc/target-globals.h
index ceb216a..9c42913 100644
--- a/gcc/target-globals.h
+++ b/gcc/target-globals.h
@@ -26,6 +26,7 @@ extern struct target_regs *this_target_regs;
 extern struct target_rtl *this_target_rtl;
 extern struct target_recog *this_target_recog;
 extern struct target_hard_regs *this_target_hard_regs;
+extern struct target_function_abi_info *this_target_function_abi_info;
 extern struct target_reload *this_target_reload;
 extern struct target_expmed *this_target_expmed;
 extern struct target_optabs *this_target_optabs;
@@ -48,6 +49,7 @@ public:
   struct target_rtl *rtl;
   struct target_recog *GTY((skip)) recog;
   struct target_hard_regs *GTY((skip)) hard_regs;
+  struct target_function_abi_info *GTY((skip)) function_abi_info;
   struct target_reload *GTY((skip)) reload;
   struct target_expmed *GTY((skip)) expmed;
   struct target_optabs *GTY((skip)) optabs;
@@ -75,6 +77,7 @@ restore_target_globals (class target_globals *g)
   this_target_rtl = g->rtl;
   this_target_recog = g->recog;
   this_target_hard_regs = g->hard_regs;
+  this_target_function_abi_info = g->function_abi_info;
   this_target_reload = g->reload;
   this_target_expmed = g->expmed;
   this_target_optabs = g->optabs;