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2014-01-16 Nick Clifton <nickc@redhat.com>
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PR middle-end/28865
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* varasm.c (output_constant): Return the number of bytes actually
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emitted.
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(output_constructor_array_range): Update the field size with the
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number of bytes emitted by output_constant.
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(output_constructor_regular_field): Likewise. Also do not
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complain if the total number of bytes emitted is now greater
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than the expected fieldpos.
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* output.h (output_constant): Update prototype and descriptive
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comment.
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* gcc.c-torture/compile/pr28865.c: New.
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* gcc.c-torture/execute/pr28865.c: New.
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--- gcc/varasm.c (revision 206660)
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+++ gcc/varasm.c (revision 206661)
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@@ -4474,8 +4474,10 @@ static unsigned HOST_WIDE_INT
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This includes the pseudo-op such as ".int" or ".byte", and a newline.
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Assumes output_addressed_constants has been done on EXP already.
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- Generate exactly SIZE bytes of assembler data, padding at the end
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- with zeros if necessary. SIZE must always be specified.
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+ Generate at least SIZE bytes of assembler data, padding at the end
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+ with zeros if necessary. SIZE must always be specified. The returned
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+ value is the actual number of bytes of assembler data generated, which
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+ may be bigger than SIZE if the object contains a variable length field.
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SIZE is important for structure constructors,
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since trailing members may have been omitted from the constructor.
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@@ -4490,14 +4492,14 @@ static unsigned HOST_WIDE_INT
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ALIGN is the alignment of the data in bits. */
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-void
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+unsigned HOST_WIDE_INT
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output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
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{
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enum tree_code code;
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unsigned HOST_WIDE_INT thissize;
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if (size == 0 || flag_syntax_only)
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- return;
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+ return size;
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/* See if we're trying to initialize a pointer in a non-default mode
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to the address of some declaration somewhere. If the target says
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@@ -4562,7 +4564,7 @@ output_constant (tree exp, unsigned HOST
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&& vec_safe_is_empty (CONSTRUCTOR_ELTS (exp)))
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{
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assemble_zeros (size);
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- return;
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+ return size;
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}
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if (TREE_CODE (exp) == FDESC_EXPR)
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@@ -4574,7 +4576,7 @@ output_constant (tree exp, unsigned HOST
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#else
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gcc_unreachable ();
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#endif
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- return;
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+ return size;
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}
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/* Now output the underlying data. If we've handling the padding, return.
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@@ -4612,8 +4614,7 @@ output_constant (tree exp, unsigned HOST
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switch (TREE_CODE (exp))
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{
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case CONSTRUCTOR:
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- output_constructor (exp, size, align, NULL);
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- return;
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+ return output_constructor (exp, size, align, NULL);
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case STRING_CST:
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thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
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size);
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@@ -4648,11 +4649,10 @@ output_constant (tree exp, unsigned HOST
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case RECORD_TYPE:
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case UNION_TYPE:
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gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
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- output_constructor (exp, size, align, NULL);
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- return;
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+ return output_constructor (exp, size, align, NULL);
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case ERROR_MARK:
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- return;
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+ return 0;
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default:
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gcc_unreachable ();
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@@ -4660,6 +4660,8 @@ output_constant (tree exp, unsigned HOST
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if (size > thissize)
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assemble_zeros (size - thissize);
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+
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+ return size;
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}
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@@ -4759,7 +4761,7 @@ output_constructor_array_range (oc_local
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if (local->val == NULL_TREE)
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assemble_zeros (fieldsize);
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else
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- output_constant (local->val, fieldsize, align2);
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+ fieldsize = output_constant (local->val, fieldsize, align2);
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/* Count its size. */
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local->total_bytes += fieldsize;
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@@ -4808,9 +4810,8 @@ output_constructor_regular_field (oc_loc
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Note no alignment needed in an array, since that is guaranteed
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if each element has the proper size. */
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if ((local->field != NULL_TREE || local->index != NULL_TREE)
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- && fieldpos != local->total_bytes)
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+ && fieldpos > local->total_bytes)
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{
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- gcc_assert (fieldpos >= local->total_bytes);
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assemble_zeros (fieldpos - local->total_bytes);
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local->total_bytes = fieldpos;
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}
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@@ -4847,7 +4848,7 @@ output_constructor_regular_field (oc_loc
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if (local->val == NULL_TREE)
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assemble_zeros (fieldsize);
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else
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- output_constant (local->val, fieldsize, align2);
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+ fieldsize = output_constant (local->val, fieldsize, align2);
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/* Count its size. */
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local->total_bytes += fieldsize;
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--- gcc/output.h (revision 206660)
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+++ gcc/output.h (revision 206661)
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@@ -294,11 +294,13 @@ extern void output_quoted_string (FILE *
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This includes the pseudo-op such as ".int" or ".byte", and a newline.
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Assumes output_addressed_constants has been done on EXP already.
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- Generate exactly SIZE bytes of assembler data, padding at the end
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- with zeros if necessary. SIZE must always be specified.
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+ Generate at least SIZE bytes of assembler data, padding at the end
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+ with zeros if necessary. SIZE must always be specified. The returned
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+ value is the actual number of bytes of assembler data generated, which
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+ may be bigger than SIZE if the object contains a variable length field.
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ALIGN is the alignment in bits that may be assumed for the data. */
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-extern void output_constant (tree, unsigned HOST_WIDE_INT, unsigned int);
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+extern unsigned HOST_WIDE_INT output_constant (tree, unsigned HOST_WIDE_INT, unsigned int);
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/* When outputting delayed branch sequences, this rtx holds the
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sequence being output. It is null when no delayed branch
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--- gcc/testsuite/gcc.c-torture/execute/pr28865.c (revision 0)
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+++ gcc/testsuite/gcc.c-torture/execute/pr28865.c (revision 206661)
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@@ -0,0 +1,21 @@
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+struct A { int a; char b[]; };
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+union B { struct A a; char b[sizeof (struct A) + 31]; };
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+union B b = { { 1, "123456789012345678901234567890" } };
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+union B c = { { 2, "123456789012345678901234567890" } };
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+
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+__attribute__((noinline, noclone)) void
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+foo (int *x[2])
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+{
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+ x[0] = &b.a.a;
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+ x[1] = &c.a.a;
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+}
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+
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+int
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+main ()
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+{
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+ int *x[2];
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+ foo (x);
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+ if (*x[0] != 1 || *x[1] != 2)
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+ __builtin_abort ();
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+ return 0;
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+}
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--- gcc/testsuite/gcc.c-torture/compile/pr28865.c (revision 0)
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+++ gcc/testsuite/gcc.c-torture/compile/pr28865.c (revision 206661)
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@@ -0,0 +1,16 @@
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+struct var_len
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+{
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+ int field1;
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+ const char field2[];
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+};
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+
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+/* Note - strictly speaking this array declaration is illegal
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+ since each element has a variable length. GCC allows it
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+ (for the moment) because it is used in existing code, such
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+ as glibc. */
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+static const struct var_len var_array[] =
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+{
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+ { 1, "Long exposure noise reduction" },
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+ { 2, "Shutter/AE lock buttons" },
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+ { 3, "Mirror lockup" }
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+};
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