[PATCH 02/08] PR jit/63854: Fix leak within jit-builtins.c

[David Malcolm]

Running testsuite/jit.dg/test-functions.c under valgrind showed this
leak (amongst others):

520 (320 direct, 200 indirect) bytes in 5 blocks are definitely lost in loss record 144 of 181
   at 0x4A06965: operator new(unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
   by 0x4DF2110: gcc::jit::recording::builtins_manager::make_fn_type(gcc::jit::recording::jit_builtin_type, gcc::jit::recording::jit_builtin_type, bool, int, ...) (jit-builtins.c:405)
   by 0x4DEEDD4: gcc::jit::recording::builtins_manager::make_type(gcc::jit::recording::jit_builtin_type) (builtin-types.def:242)
   by 0x4DED7B9: gcc::jit::recording::builtins_manager::get_type(gcc::jit::recording::jit_builtin_type) (jit-builtins.c:216)
   by 0x4DED5BB: gcc::jit::recording::builtins_manager::make_builtin_function(built_in_function) (jit-builtins.c:177)
   by 0x4DED503: gcc::jit::recording::builtins_manager::get_builtin_function(char const*) (jit-builtins.c:163)
   by 0x4DD7F57: gcc::jit::recording::context::get_builtin_function(char const*) (jit-recording.c:576)
   by 0x4DD33D5: gcc_jit_context_get_builtin_function (libgccjit.c:851)
   by 0x402820: create_test_of_builtin_strcmp (test-functions.c:134)
   by 0x402B2D: create_use_of_builtins (test-functions.c:231)
   by 0x4033E1: create_code (test-functions.c:345)
   by 0x40216D: test_jit (harness.h:217)

The recording::function_type instances created by the builtin_manager
were being leaked.  These are recording::memento instances, and thus
the context is responsible for freeing them - the bug was that they
weren't getting recorded into the context's list of mementos.

In general, only the recording::context should directly create mementos;
everything else goes through factory methods of recording::context, which
takes care of calling "record" on the new instances (putting them into
the list of "owned" objects).

Fix this by creating a new "new_function_type" factory method of the
context and using it from jit-builtins.c

gcc/jit/ChangeLog:
	PR jit/63854
	* jit-builtins.c
	(gcc::jit::recording::builtins_manager::make_fn_type): Call the
	context's new_function_type method, rather than directly creating
	a function_type instance.
	* jit-recording.c
	(gcc::jit::recording::context::new_function_type): New method,
	adapted from part of...
	(gcc::jit::recording::context::new_function_ptr_type): ...this.
	Update to call new_function_type.
	* jit-recording.h
	(gcc::jit::recording::context::new_function_type): New method.
---
 gcc/jit/jit-builtins.c  |  9 ++++-----
 gcc/jit/jit-recording.c | 33 ++++++++++++++++++++++++++-------
 gcc/jit/jit-recording.h |  6 ++++++
 3 files changed, 36 insertions(+), 12 deletions(-)

diff --git a/gcc/jit/jit-builtins.c b/gcc/jit/jit-builtins.c
index 07902e8..49d37d8 100644
--- a/gcc/jit/jit-builtins.c
+++ b/gcc/jit/jit-builtins.c
@@ -398,11 +398,10 @@ builtins_manager::make_fn_type (enum jit_builtin_type,
   if (!return_type)
     goto error;
 
-  result = new function_type (m_ctxt,
-			      return_type,
-			      num_args,
-			      param_types,
-			      is_variadic);
+  result = m_ctxt->new_function_type (return_type,
+				      num_args,
+				      param_types,
+				      is_variadic);
 
  error:
   delete[] param_types;
diff --git a/gcc/jit/jit-recording.c b/gcc/jit/jit-recording.c
index 8069afc..32bf034 100644
--- a/gcc/jit/jit-recording.c
+++ b/gcc/jit/jit-recording.c
@@ -492,6 +492,27 @@ recording::context::new_union_type (recording::location *loc,
   return result;
 }
 
+/* Create a recording::function_type instance and add it to this context's
+   list of mementos.
+
+   Used by new_function_ptr_type and by builtins_manager::make_fn_type.  */
+
+recording::function_type *
+recording::context::new_function_type (recording::type *return_type,
+				       int num_params,
+				       recording::type **param_types,
+				       int is_variadic)
+{
+  recording::function_type *fn_type
+    = new function_type (this,
+			 return_type,
+			 num_params,
+			 param_types,
+			 is_variadic);
+  record (fn_type);
+  return fn_type;
+}
+
 /* Create a recording::type instance and add it to this context's list
    of mementos.
 
@@ -505,13 +526,11 @@ recording::context::new_function_ptr_type (recording::location *, /* unused loc
 					   recording::type **param_types,
 					   int is_variadic)
 {
-  recording::function_type *fn_type =
-    new function_type (this,
-		       return_type,
-		       num_params,
-		       param_types,
-		       is_variadic);
-  record (fn_type);
+  recording::function_type *fn_type
+    = new_function_type (return_type,
+			 num_params,
+			 param_types,
+			 is_variadic);
 
   /* Return a pointer-type to the the function type.  */
   return fn_type->get_pointer ();
diff --git a/gcc/jit/jit-recording.h b/gcc/jit/jit-recording.h
index 4ea8ef1..9b2cfc6 100644
--- a/gcc/jit/jit-recording.h
+++ b/gcc/jit/jit-recording.h
@@ -88,6 +88,12 @@ public:
   new_union_type (location *loc,
 		  const char *name);
 
+  function_type *
+  new_function_type (type *return_type,
+		     int num_params,
+		     type **param_types,
+		     int is_variadic);
+
   type *
   new_function_ptr_type (location *loc,
 			 type *return_type,
-- 
1.8.5.3