[HSA] Fix usage of an uninitialized memory

[HSA] Fix usage of an uninitialized memory

[Martin Liška]

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Hello.

In the following patch, I fix usage of an uninitialized variable: hsa_cfun->decl.
Installed as revision 228659.

Thanks,
Martin

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From 7f85ed1c1d3f2fe6132117f58c84af33cb709689 Mon Sep 17 00:00:00 2001
From: marxin <mliska@suse.cz>
Date: Fri, 9 Oct 2015 15:06:46 +0200
Subject: [PATCH 1/7] HSA: fix usage of uninitialized variable in
 hsa_function_representation

gcc/ChangeLog:

2015-10-09  Martin Liska  <mliska@suse.cz>

	* hsa-gen.c (hsa_function_representation::hsa_function_representation):
	Change arguments of the constructor.
	(hsa_init_data_for_cfun): Remove creation of hsa_cfun from
	this function.
	(generate_hsa): Move it here.
	* hsa.h (hsa_function_representation::hsa_function_representation):
	Declare.
---
 gcc/hsa-gen.c | 11 +++++------
 gcc/hsa.h     |  2 +-
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/gcc/hsa-gen.c b/gcc/hsa-gen.c
index cf36882..a5099b6 100644
--- a/gcc/hsa-gen.c
+++ b/gcc/hsa-gen.c
@@ -202,7 +202,8 @@ static vec <hsa_op_immed*> hsa_list_operand_immed;
 
 /* TODO: Move more initialization here. */
 
-hsa_function_representation::hsa_function_representation ()
+hsa_function_representation::hsa_function_representation
+  (tree fdecl, bool kernel_p): kern_p (kernel_p), decl (fdecl)
 {
   name = NULL;
   input_args_count = 0;
@@ -216,7 +217,6 @@ hsa_function_representation::hsa_function_representation ()
   readonly_variables = vNULL;
   hbb_count = 0;
   in_ssa = true;	/* We start in SSA.  */
-  kern_p = false;
   declaration_p = false;
   called_functions = vNULL;
   shadow_reg = NULL;
@@ -313,7 +313,6 @@ hsa_init_data_for_cfun ()
     = new object_allocator<hsa_insn_queue> ("HSA queue instructions");
   hsa_allocp_bb = new object_allocator<hsa_bb> ("HSA basic blocks");
   hsa_allocp_symbols = new object_allocator<hsa_symbol> ("HSA symbols");
-  hsa_cfun = new hsa_function_representation ();
 
   /* The entry/exit blocks don't contain incoming code,
      but the HSA generator might use them to put code into,
@@ -5121,14 +5120,14 @@ generate_hsa (bool kernel)
   if (hsa_num_threads == NULL)
     emit_hsa_module_variables ();
 
+  /* Initialize hsa_cfun.  */
+  hsa_cfun = new hsa_function_representation (cfun->decl, kernel);
   hsa_init_data_for_cfun ();
+
   verify_function_arguments (cfun->decl);
   if (hsa_seen_error ())
     goto fail;
 
-  hsa_cfun->decl = cfun->decl;
-  hsa_cfun->kern_p = kernel;
-
   host_decl = hsa_get_host_function (current_function_decl);
   ssa_map.safe_grow_cleared (SSANAMES (cfun)->length ());
   hsa_cfun->name = xstrdup (hsa_get_declaration_name (host_decl));
diff --git a/gcc/hsa.h b/gcc/hsa.h
index 98d70e0..fbc6684 100644
--- a/gcc/hsa.h
+++ b/gcc/hsa.h
@@ -908,7 +908,7 @@ hsa_free_symbol_hasher::equal (const value_type a, const compare_type b)
 class hsa_function_representation
 {
 public:
-  hsa_function_representation ();
+  hsa_function_representation (tree fdecl, bool kernel_p);
   ~hsa_function_representation ();
 
   /* Builds a shadow register that is utilized to a kernel dispatch.  */
-- 
2.5.1