Patchwork PR middle-end/51696: display indirect function calls properly for trans-mem

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Submitter Aldy Hernandez
Date Jan. 3, 2012, 5:04 p.m.
Message ID <4F033514.6050904@redhat.com>
Download mbox | patch
Permalink /patch/134040/
State New
Headers show

Comments

Aldy Hernandez - Jan. 3, 2012, 5:04 p.m.
For the following testcase, we display indirect calls as memory 
addresses, which can confuse the user:

struct list {
   void (*compare)();
} *listPtr;
static void (*compare)();
__attribute__((transaction_safe))
static void func () {
     listPtr->compare();
/* ^^^^^^^^^^^^^^^^^^^^^^^^^^ */
/* error: unsafe function call ‘<Uf3c0>’.... */
     compare();
}

This happens because pp_c_tree_decl_identifier() dumps the memory 
address when there is no DECL_NAME associated with the symbol.

Instead of displaying something like <Uf3c0> in this particular error, 
perhaps we can display "unsafe indirect function call...".

OK?
PR middle-end/51696
	* trans-mem.c (diagnose_tm_1): Display indirect calls with no name
	correctly.

Patch

Index: testsuite/gcc.dg/tm/pr51696.c
===================================================================
--- testsuite/gcc.dg/tm/pr51696.c	(revision 0)
+++ testsuite/gcc.dg/tm/pr51696.c	(revision 0)
@@ -0,0 +1,14 @@ 
+/* { dg-do compile } */
+/* { dg-options "-fgnu-tm" } */
+
+struct list {
+  void (*compare)();
+} *listPtr;
+
+static void (*compare)();
+
+__attribute__((transaction_safe))
+static void func () {
+  listPtr->compare(); /* { dg-error "unsafe indirect function call" } */
+  compare(); /* { dg-error "unsafe function call" } */
+}
Index: trans-mem.c
===================================================================
--- trans-mem.c	(revision 182848)
+++ trans-mem.c	(working copy)
@@ -664,9 +664,16 @@  diagnose_tm_1 (gimple_stmt_iterator *gsi
 				"unsafe function call %qD within "
 				"atomic transaction", fn);
 		    else
-		      error_at (gimple_location (stmt),
-				"unsafe function call %qE within "
-				"atomic transaction", fn);
+		      {
+			if (DECL_NAME (fn))
+			  error_at (gimple_location (stmt),
+				    "unsafe function call %qE within "
+				    "atomic transaction", fn);
+			else
+			  error_at (gimple_location (stmt),
+				    "unsafe indirect function call within "
+				    "atomic transaction", fn);
+		      }
 		  }
 		else
 		  {
@@ -675,9 +682,16 @@  diagnose_tm_1 (gimple_stmt_iterator *gsi
 				"unsafe function call %qD within "
 				"%<transaction_safe%> function", fn);
 		    else
-		      error_at (gimple_location (stmt),
-				"unsafe function call %qE within "
-				"%<transaction_safe%> function", fn);
+		      {
+			if (DECL_NAME (fn))
+			  error_at (gimple_location (stmt),
+				    "unsafe function call %qE within "
+				    "%<transaction_safe%> function", fn);
+			else
+			  error_at (gimple_location (stmt),
+				    "unsafe indirect function call within "
+				    "%<transaction_safe%> function", fn);
+		      }
 		  }
 	      }
 	  }