PR middle-end/67653

	* gimplify.c (gimplify_asm_expr): Warn if it is too late to
	attempt to mark memory input operand addressable and
	call prepare_gimple_addressable in that case.  Don't adjust
	input_location for diagnostics, use error_at instead.

	* c-c++-common/pr67653.c: New test.
	* gcc.dg/torture/pr29119.c: Add dg-warning.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@232640 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f2eb936..06aae56 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2016-01-21  Jakub Jelinek  <jakub@redhat.com>
+
+       PR middle-end/67653
+       * gimplify.c (gimplify_asm_expr): Warn if it is too late to
+       attempt to mark memory input operand addressable and
+       call prepare_gimple_addressable in that case.  Don't adjust
+       input_location for diagnostics, use error_at instead.
+
 2016-01-20  Peter Bergner  <bergner@vnet.ibm.com>
 
        * config/rs6000/ppc-auxv.h: New file.

diff --git a/gcc/gimplify.c b/gcc/gimplify.c
index c8de1e6..32bc1fd 100644 (file)
--- a/gcc/gimplify.c
+++ b/gcc/gimplify.c
@@ -5305,12 +5305,38 @@ gimplify_asm_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
            TREE_VALUE (link) = error_mark_node;
          tret = gimplify_expr (&TREE_VALUE (link), pre_p, post_p,
                                is_gimple_lvalue, fb_lvalue | fb_mayfail);
+         if (tret != GS_ERROR)
+           {
+             /* Unlike output operands, memory inputs are not guaranteed
+                to be lvalues by the FE, and while the expressions are
+                marked addressable there, if it is e.g. a statement
+                expression, temporaries in it might not end up being
+                addressable.  They might be already used in the IL and thus
+                it is too late to make them addressable now though.  */
+             tree x = TREE_VALUE (link);
+             while (handled_component_p (x))
+               x = TREE_OPERAND (x, 0);
+             if (TREE_CODE (x) == MEM_REF
+                 && TREE_CODE (TREE_OPERAND (x, 0)) == ADDR_EXPR)
+               x = TREE_OPERAND (TREE_OPERAND (x, 0), 0);
+             if ((TREE_CODE (x) == VAR_DECL
+                  || TREE_CODE (x) == PARM_DECL
+                  || TREE_CODE (x) == RESULT_DECL)
+                 && !TREE_ADDRESSABLE (x)
+                 && is_gimple_reg (x))
+               {
+                 warning_at (EXPR_LOC_OR_LOC (TREE_VALUE (link),
+                                              input_location), 0,
+                             "memory input %d is not directly addressable",
+                             i);
+                 prepare_gimple_addressable (&TREE_VALUE (link), pre_p);
+               }
+           }
          mark_addressable (TREE_VALUE (link));
          if (tret == GS_ERROR)
            {
-             if (EXPR_HAS_LOCATION (TREE_VALUE (link)))
-               input_location = EXPR_LOCATION (TREE_VALUE (link));
-             error ("memory input %d is not directly addressable", i);
+             error_at (EXPR_LOC_OR_LOC (TREE_VALUE (link), input_location),
+                       "memory input %d is not directly addressable", i);
              ret = tret;
            }
        }

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index bd23b36..0a2e22f 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,9 @@
+2016-01-21  Jakub Jelinek  <jakub@redhat.com>
+
+       PR middle-end/67653
+       * c-c++-common/pr67653.c: New test.
+       * gcc.dg/torture/pr29119.c: Add dg-warning.
+
 2016-01-20  Peter Bergner  <bergner@vnet.ibm.com>
 
        * gcc.target/powerpc/cpu-builtin-1.c: New test.

diff --git a/gcc/testsuite/c-c++-common/pr67653.c b/gcc/testsuite/c-c++-common/pr67653.c
new file mode 100644 (file)
index 0000000..1b9f63e
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/pr67653.c
@@ -0,0 +1,8 @@
+/* PR middle-end/67653 */
+/* { dg-do compile } */
+
+void
+foo (void)
+{
+  __asm__ ("" : : "m" (({ static int a; a; })));       /* { dg-warning "memory input 0 is not directly addressable" } */
+}

diff --git a/gcc/testsuite/gcc.dg/torture/pr29119.c b/gcc/testsuite/gcc.dg/torture/pr29119.c
index 63e5d86..d4f02f1 100644 (file)
--- a/gcc/testsuite/gcc.dg/torture/pr29119.c
+++ b/gcc/testsuite/gcc.dg/torture/pr29119.c
@@ -2,6 +2,5 @@
 
 void ldt_add_entry(void)
 {
-   __asm__ ("" :: "m"(({unsigned __v; __v;})));
+   __asm__ ("" :: "m"(({unsigned __v; __v;})));        /* { dg-warning "memory input 0 is not directly addressable" } */
 }
-