gcc/ChangeLog:

	Add support for debugging with ICF (Identical Code Folding).
	* calls.c (debug.h): New #include.
	(emit_call_1): Call virtual_call_token debug hook.
	* common.opt (-fenable-icf-debug): New option.
	* dwarf2out.c (dwarf2_debug_hooks): Add entries for new hooks (two
	locations in the source).
	(poc_label_num): New variable.
	(dcall_entry, vcall_entry): New typedefs.
	(dcall_table, vcall_table): New variables.
	(struct vcall_insn): New type.
	(vcall_insn_table): New variable.
	(DEBUG_DCALL_SECTION, DEBUG_VCALL_SECTION): New macros.
	(size_of_dcall_table): New function.
	(output_dcall_table): New function.
	(size_of_vcall_table): New function.
	(output_vcall_table): New function.
	(dwarf2out_direct_call): New function.
	(vcall_insn_table_hash): New function.
	(vcall_insn_table_eq): New function.
	(dwarf2out_virtual_call_token): New function.
	(dwarf2out_virtual_call): New function.
	(dwarf2out_init): Allocate new tables and sections.
	(prune_unused_types): Mark DIEs referenced from direct call table.
	(dwarf2out_finish): Output direct and virtual call tables.
	* final.c (final_scan_insn): Call direct_call and virtual_call
	debug hooks.
	* debug.h (struct gcc_debug_hooks): Add direct_call,
	virtual_call_token, virtual_call hooks.
	(debug_nothing_uid): New function.
	* debug.c (do_nothing_debug_hooks): Add dummy entries for new hooks.
	(debug_nothing_uid): New function.
	* dbxout.c (dbx_debug_hooks): Add dummy entries for new hooks.
	* sdbout.c (sdb_debug_hooks): Likewise.
	* vmsdbgout.c (vmsdbg_debug_hooks): Likewise.
	* doc/invoke.texi (-fenable-icf-debug): New option.

gcc/testsuite/ChangeLog:
	Add support for debugging with ICF (Identical Code Folding).
	* g++.dg/debug/dwarf2/icf.C: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@152577 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 20 insertions, 0 deletions

diff --git a/gcc/final.c b/gcc/final.c
index f121da1b5cd..b8f5e513817 100644
--- a/gcc/final.c
+++ b/gcc/final.c
@@ -2684,6 +2684,26 @@ final_scan_insn (rtx insn, FILE *file, int optimize ATTRIBUTE_UNUSED,
 	/* Output assembler code from the template.  */
 	output_asm_insn (templ, recog_data.operand);
 
+	/* Record point-of-call information for ICF debugging.  */
+	if (flag_enable_icf_debug && CALL_P (insn))
+	  {
+	    rtx x = call_from_call_insn (insn);
+	    x = XEXP (x, 0);
+	    if (x && MEM_P (x))
+	      {
+	        if (GET_CODE (XEXP (x, 0)) == SYMBOL_REF)
+	          {
+		    tree t;
+		    x = XEXP (x, 0);
+		    t = SYMBOL_REF_DECL (x);
+		    if (t)
+		      (*debug_hooks->direct_call) (t);
+	          }
+	        else
+	          (*debug_hooks->virtual_call) (INSN_UID (insn));
+	      }
+	  }
+
 	/* Some target machines need to postscan each insn after
 	   it is output.  */
 	if (targetm.asm_out.final_postscan_insn)