From: Jan Hubicka <jh@suse.cz>
Date: Thu, 5 Nov 2020 17:19:07 +0000 (+0100)
Subject: Add fnspecs for C++ new and delete operators
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=58c9de46541ade795987b8949cfa685f02b0318a;p=gcc.git

Add fnspecs for C++ new and delete operators

gcc/ChangeLog:

	* gimple.c (gimple_call_fnspec): Handle C++ new and delete.
	* gimple.h (gimple_call_from_new_or_delete): Constify parameter.

gcc/testsuite/ChangeLog:

	* g++.dg/ipa/devirt-24.C: Update template.
---

diff --git a/gcc/gimple.c b/gcc/gimple.c
index 469e6f369f3..1afed88e1f1 100644
--- a/gcc/gimple.c
+++ b/gcc/gimple.c
@@ -1510,6 +1510,19 @@ gimple_call_fnspec (const gcall *stmt)
     }
   if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
     return builtin_fnspec (gimple_call_fndecl (stmt));
+  tree fndecl = gimple_call_fndecl (stmt);
+  /* If the call is to a replaceable operator delete and results
+     from a delete expression as opposed to a direct call to
+     such operator, then we can treat it as free.  */
+  if (fndecl
+      && DECL_IS_OPERATOR_DELETE_P (fndecl)
+      && gimple_call_from_new_or_delete (stmt))
+    return ".co ";
+  /* Similarly operator new can be treated as malloc.  */
+  if (fndecl
+      && DECL_IS_OPERATOR_NEW_P (fndecl)
+      && gimple_call_from_new_or_delete (stmt))
+    return "mC";
   return "";
 }
 
diff --git a/gcc/gimple.h b/gcc/gimple.h
index 87c90be9a6a..62b5a8a6124 100644
--- a/gcc/gimple.h
+++ b/gcc/gimple.h
@@ -3405,7 +3405,7 @@ gimple_call_set_from_new_or_delete (gcall *s, bool from_new_or_delete_p)
    from a new or delete expression.  */
 
 static inline bool
-gimple_call_from_new_or_delete (gcall *s)
+gimple_call_from_new_or_delete (const gcall *s)
 {
   return (s->subcode & GF_CALL_FROM_NEW_OR_DELETE) != 0;
 }
diff --git a/gcc/testsuite/g++.dg/ipa/devirt-24.C b/gcc/testsuite/g++.dg/ipa/devirt-24.C
index eaef1f5b3f8..7b5b806dd05 100644
--- a/gcc/testsuite/g++.dg/ipa/devirt-24.C
+++ b/gcc/testsuite/g++.dg/ipa/devirt-24.C
@@ -37,4 +37,4 @@ C *b = new (C);
   }
 }
 /* { dg-final { scan-ipa-dump-times "Discovered a virtual call to a known target" 1 "inline" { xfail *-*-* } } } */
-/* { dg-final { scan-ipa-dump-times "Aggregate passed by reference" 1 "cp"  } } */
+/* { dg-final { scan-ipa-dump-times "Aggregate passed by reference" 2 "cp"  } } */