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, 4 insertions, 0 deletions

diff --git a/gcc/target-globals.c b/gcc/target-globals.c
index 8928fc19fd3..359677e68af 100644
--- a/gcc/target-globals.c
+++ b/gcc/target-globals.c
@@ -40,6 +40,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "gcse.h"
 #include "bb-reorder.h"
 #include "lower-subreg.h"
+#include "function-abi.h"
 
 #if SWITCHABLE_TARGET
 class target_globals default_target_globals = {
@@ -48,6 +49,7 @@ class target_globals default_target_globals = {
   &default_target_rtl,
   &default_target_recog,
   &default_target_hard_regs,
+  &default_target_function_abi_info,
   &default_target_reload,
   &default_target_expmed,
   &default_target_optabs,
@@ -70,6 +72,7 @@ save_target_globals (void)
   g->rtl = ggc_cleared_alloc<target_rtl> ();
   g->recog = XCNEW (struct target_recog);
   g->hard_regs = XCNEW (struct target_hard_regs);
+  g->function_abi_info = XCNEW (struct target_function_abi_info);
   g->reload = XCNEW (struct target_reload);
   g->expmed = XCNEW (struct target_expmed);
   g->optabs = XCNEW (struct target_optabs);
@@ -127,6 +130,7 @@ target_globals::~target_globals ()
       XDELETE (regs);
       XDELETE (recog);
       XDELETE (hard_regs);
+      XDELETE (function_abi_info);
       XDELETE (reload);
       XDELETE (expmed);
       XDELETE (optabs);