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* [gcc r13-5147] Replace flag_strict_flex_arrays with DECL_NOT_FLEXARRAY in middle-end.
@ 2023-01-13 15:08 Qing Zhao
0 siblings, 0 replies; only message in thread
From: Qing Zhao @ 2023-01-13 15:08 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:a3e8727b70f546dc82941391f3951188a0339e08
commit r13-5147-ga3e8727b70f546dc82941391f3951188a0339e08
Author: Qing Zhao <qing.zhao@oracle.com>
Date: Fri Jan 13 15:08:00 2023 +0000
Replace flag_strict_flex_arrays with DECL_NOT_FLEXARRAY in middle-end.
We should not directly check flag_strict_flex_arrays in the
middle end. Instead, check DECL_NOT_FLEXARRAY(array_field_decl) which is set
by C/C++ FEs according to -fstrict-flex-arrays and the corresponding
attribute attached to the array_field.
As a result, We will lose the LEVEL information of -fstrict-flex-arrays in
the middle end. -Wstrict-flex-arrays will not be able to issue such
information. update the testing cases accordingly.
gcc/ChangeLog:
* attribs.cc (strict_flex_array_level_of): Move this function to ...
* attribs.h (strict_flex_array_level_of): Remove the declaration.
* gimple-array-bounds.cc (array_bounds_checker::check_array_ref):
replace the referece to strict_flex_array_level_of with
DECL_NOT_FLEXARRAY.
* tree.cc (component_ref_size): Likewise.
gcc/c/ChangeLog:
* c-decl.cc (strict_flex_array_level_of): ... here.
gcc/testsuite/ChangeLog:
* gcc.dg/Warray-bounds-flex-arrays-1.c: Delete the level information
from the message issued by -Wstrict-flex-arrays.
* gcc.dg/Warray-bounds-flex-arrays-2.c: Likewise.
* gcc.dg/Warray-bounds-flex-arrays-3.c: Likewise.
* gcc.dg/Warray-bounds-flex-arrays-4.c: Likewise.
* gcc.dg/Warray-bounds-flex-arrays-5.c: Likewise.
* gcc.dg/Warray-bounds-flex-arrays-6.c: Likewise.
* gcc.dg/Wstrict-flex-arrays-2.c: Likewise.
* gcc.dg/Wstrict-flex-arrays-3.c: Likewise.
* gcc.dg/Wstrict-flex-arrays.c: Likewise.
Diff:
---
gcc/attribs.cc | 30 --------------
gcc/attribs.h | 2 -
gcc/c/c-decl.cc | 28 +++++++++++++
gcc/gimple-array-bounds.cc | 46 +++++-----------------
gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-1.c | 2 +-
gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-2.c | 4 +-
gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-3.c | 6 +--
gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-4.c | 2 +-
gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-5.c | 4 +-
gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-6.c | 6 +--
gcc/testsuite/gcc.dg/Wstrict-flex-arrays-2.c | 8 ++--
gcc/testsuite/gcc.dg/Wstrict-flex-arrays-3.c | 8 ++--
gcc/testsuite/gcc.dg/Wstrict-flex-arrays.c | 8 ++--
gcc/tree.cc | 37 ++++-------------
14 files changed, 68 insertions(+), 123 deletions(-)
diff --git a/gcc/attribs.cc b/gcc/attribs.cc
index 49cb299a3c1..7db730cf831 100644
--- a/gcc/attribs.cc
+++ b/gcc/attribs.cc
@@ -2456,36 +2456,6 @@ init_attr_rdwr_indices (rdwr_map *rwm, tree attrs)
}
}
-/* Get the LEVEL of the strict_flex_array for the ARRAY_FIELD based on the
- values of attribute strict_flex_array and the flag_strict_flex_arrays. */
-unsigned int
-strict_flex_array_level_of (tree array_field)
-{
- gcc_assert (TREE_CODE (array_field) == FIELD_DECL);
- unsigned int strict_flex_array_level = flag_strict_flex_arrays;
-
- tree attr_strict_flex_array
- = lookup_attribute ("strict_flex_array", DECL_ATTRIBUTES (array_field));
- /* If there is a strict_flex_array attribute attached to the field,
- override the flag_strict_flex_arrays. */
- if (attr_strict_flex_array)
- {
- /* Get the value of the level first from the attribute. */
- unsigned HOST_WIDE_INT attr_strict_flex_array_level = 0;
- gcc_assert (TREE_VALUE (attr_strict_flex_array) != NULL_TREE);
- attr_strict_flex_array = TREE_VALUE (attr_strict_flex_array);
- gcc_assert (TREE_VALUE (attr_strict_flex_array) != NULL_TREE);
- attr_strict_flex_array = TREE_VALUE (attr_strict_flex_array);
- gcc_assert (tree_fits_uhwi_p (attr_strict_flex_array));
- attr_strict_flex_array_level = tree_to_uhwi (attr_strict_flex_array);
-
- /* The attribute has higher priority than flag_struct_flex_array. */
- strict_flex_array_level = attr_strict_flex_array_level;
- }
- return strict_flex_array_level;
-}
-
-
/* Return the access specification for a function parameter PARM
or null if the current function has no such specification. */
diff --git a/gcc/attribs.h b/gcc/attribs.h
index e7540f71d6a..140e70b64e0 100644
--- a/gcc/attribs.h
+++ b/gcc/attribs.h
@@ -398,6 +398,4 @@ extern void init_attr_rdwr_indices (rdwr_map *, tree);
extern attr_access *get_parm_access (rdwr_map &, tree,
tree = current_function_decl);
-extern unsigned int strict_flex_array_level_of (tree);
-
#endif // GCC_ATTRIBS_H
diff --git a/gcc/c/c-decl.cc b/gcc/c/c-decl.cc
index d76ffb3380d..38647c100c1 100644
--- a/gcc/c/c-decl.cc
+++ b/gcc/c/c-decl.cc
@@ -9047,6 +9047,34 @@ finish_incomplete_vars (tree incomplete_vars, bool toplevel)
}
}
+/* Get the LEVEL of the strict_flex_array for the ARRAY_FIELD based on the
+ values of attribute strict_flex_array and the flag_strict_flex_arrays. */
+static unsigned int
+strict_flex_array_level_of (tree array_field)
+{
+ gcc_assert (TREE_CODE (array_field) == FIELD_DECL);
+ unsigned int strict_flex_array_level = flag_strict_flex_arrays;
+
+ tree attr_strict_flex_array
+ = lookup_attribute ("strict_flex_array", DECL_ATTRIBUTES (array_field));
+ /* If there is a strict_flex_array attribute attached to the field,
+ override the flag_strict_flex_arrays. */
+ if (attr_strict_flex_array)
+ {
+ /* Get the value of the level first from the attribute. */
+ unsigned HOST_WIDE_INT attr_strict_flex_array_level = 0;
+ gcc_assert (TREE_VALUE (attr_strict_flex_array) != NULL_TREE);
+ attr_strict_flex_array = TREE_VALUE (attr_strict_flex_array);
+ gcc_assert (TREE_VALUE (attr_strict_flex_array) != NULL_TREE);
+ attr_strict_flex_array = TREE_VALUE (attr_strict_flex_array);
+ gcc_assert (tree_fits_uhwi_p (attr_strict_flex_array));
+ attr_strict_flex_array_level = tree_to_uhwi (attr_strict_flex_array);
+
+ /* The attribute has higher priority than flag_struct_flex_array. */
+ strict_flex_array_level = attr_strict_flex_array_level;
+ }
+ return strict_flex_array_level;
+}
/* Determine whether the FIELD_DECL X is a flexible array member according to
the following info:
diff --git a/gcc/gimple-array-bounds.cc b/gcc/gimple-array-bounds.cc
index 116200a317f..66fd46e9b6c 100644
--- a/gcc/gimple-array-bounds.cc
+++ b/gcc/gimple-array-bounds.cc
@@ -350,18 +350,14 @@ array_bounds_checker::check_array_ref (location_t location, tree ref,
/* Set to the type of the special array member for a COMPONENT_REF. */
special_array_member sam{ };
-
+ tree afield_decl = NULL_TREE;
tree arg = TREE_OPERAND (ref, 0);
- const bool compref = TREE_CODE (arg) == COMPONENT_REF;
- unsigned int strict_flex_array_level = flag_strict_flex_arrays;
- if (compref)
+ if (TREE_CODE (arg) == COMPONENT_REF)
{
/* Try to determine special array member type for this COMPONENT_REF. */
sam = component_ref_sam_type (arg);
- /* Get the level of strict_flex_array for this array field. */
- tree afield_decl = TREE_OPERAND (arg, 1);
- strict_flex_array_level = strict_flex_array_level_of (afield_decl);
+ afield_decl = TREE_OPERAND (arg, 1);
}
get_up_bounds_for_array_ref (ref, &decl, &up_bound, &up_bound_p1);
@@ -412,39 +408,15 @@ array_bounds_checker::check_array_ref (location_t location, tree ref,
/* issue warnings for -Wstrict-flex-arrays according to the level of
flag_strict_flex_arrays. */
- if (out_of_bound && warn_strict_flex_arrays)
- switch (strict_flex_array_level)
- {
- case 3:
- /* Issue additional warnings for trailing arrays [0]. */
- if (sam == special_array_member::trail_0)
+ if ((out_of_bound && warn_strict_flex_arrays)
+ && (((sam == special_array_member::trail_0)
+ || (sam == special_array_member::trail_1)
+ || (sam == special_array_member::trail_n))
+ && DECL_NOT_FLEXARRAY (afield_decl)))
warned = warning_at (location, OPT_Wstrict_flex_arrays,
"trailing array %qT should not be used as "
- "a flexible array member for level 3",
+ "a flexible array member",
artype);
- /* FALLTHROUGH. */
- case 2:
- /* Issue additional warnings for trailing arrays [1]. */
- if (sam == special_array_member::trail_1)
- warned = warning_at (location, OPT_Wstrict_flex_arrays,
- "trailing array %qT should not be used as "
- "a flexible array member for level 2 and "
- "above", artype);
- /* FALLTHROUGH. */
- case 1:
- /* Issue warnings for trailing arrays [n]. */
- if (sam == special_array_member::trail_n)
- warned = warning_at (location, OPT_Wstrict_flex_arrays,
- "trailing array %qT should not be used as "
- "a flexible array member for level 1 and "
- "above", artype);
- break;
- case 0:
- /* Do nothing. */
- break;
- default:
- gcc_unreachable ();
- }
/* Avoid more warnings when checking more significant subscripts
of the same expression. */
diff --git a/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-1.c b/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-1.c
index 65c9fec43af..fd2aacf6452 100644
--- a/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-1.c
+++ b/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-1.c
@@ -32,7 +32,7 @@ void __attribute__((__noinline__)) stuff(
struct trailing_array_4 *trailing_flex)
{
normal->c[5] = 5; /*{ dg-warning "array subscript 5 is above array bounds of" } */
- /*{ dg-warning "should not be used as a flexible array member for level 1 and above" "" { target *-*-* } .-1 } */
+ /*{ dg-warning "should not be used as a flexible array member" "" { target *-*-* } .-1 } */
trailing_1->c[2] = 2; /* { dg-bogus "array subscript " } */
trailing_0->c[1] = 1; /* { dg-bogus "array subscript " } */
trailing_flex->c[10] = 10; /* { dg-bogus "array subscript " } */
diff --git a/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-2.c b/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-2.c
index 2b5a895c598..55b7535424b 100644
--- a/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-2.c
+++ b/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-2.c
@@ -32,9 +32,9 @@ void __attribute__((__noinline__)) stuff(
struct trailing_array_4 *trailing_flex)
{
normal->c[5] = 5; /*{ dg-warning "array subscript 5 is above array bounds of" } */
- /*{ dg-warning "should not be used as a flexible array member for level 1 and above" "" { target *-*-* } .-1 } */
+ /*{ dg-warning "should not be used as a flexible array member" "" { target *-*-* } .-1 } */
trailing_1->c[2] = 2; /* { dg-warning "array subscript 2 is above array bounds of" } */
- /* { dg-warning "should not be used as a flexible array member for level 2 and above" "" { target *-*-* } .-1 } */
+ /* { dg-warning "should not be used as a flexible array member" "" { target *-*-* } .-1 } */
trailing_0->c[1] = 1; /* { dg-bogus "array subscript " } */
trailing_flex->c[10] = 10; /* { dg-bogus "array subscript " } */
diff --git a/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-3.c b/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-3.c
index 25b903f2615..abdf8f15c78 100644
--- a/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-3.c
+++ b/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-3.c
@@ -32,11 +32,11 @@ void __attribute__((__noinline__)) stuff(
struct trailing_array_4 *trailing_flex)
{
normal->c[5] = 5; /*{ dg-warning "array subscript 5 is above array bounds of" } */
- /*{ dg-warning "should not be used as a flexible array member for level 1 and above" "" { target *-*-* } .-1 } */
+ /*{ dg-warning "should not be used as a flexible array member" "" { target *-*-* } .-1 } */
trailing_1->c[2] = 2; /*{ dg-warning "array subscript 2 is above array bounds of" } */
- /* { dg-warning "should not be used as a flexible array member for level 2 and above" "" { target *-*-* } .-1 } */
+ /* { dg-warning "should not be used as a flexible array member" "" { target *-*-* } .-1 } */
trailing_0->c[1] = 1; /*{ dg-warning "array subscript 1 is outside array bounds of" } */
- /* { dg-warning "should not be used as a flexible array member for level 3" "" { target *-*-* } .-1 } */
+ /* { dg-warning "should not be used as a flexible array member" "" { target *-*-* } .-1 } */
trailing_flex->c[10] = 10; /* { dg-bogus "array subscript" } */
}
diff --git a/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-4.c b/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-4.c
index 5fc500a19ca..82b38ff1ad1 100644
--- a/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-4.c
+++ b/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-4.c
@@ -32,7 +32,7 @@ void __attribute__((__noinline__)) stuff(
struct trailing_array_4 *trailing_flex)
{
normal->c[5] = 5; /*{ dg-warning "array subscript 5 is above array bounds of" } */
- /*{ dg-warning "should not be used as a flexible array member for level 1 and above" "" { target *-*-* } .-1 } */
+ /*{ dg-warning "should not be used as a flexible array member" "" { target *-*-* } .-1 } */
trailing_1->c[2] = 2; /* { dg-bogus "array subscript " } */
trailing_0->c[1] = 1; /* { dg-bogus "array subscript " } */
trailing_flex->c[10] = 10; /* { dg-bogus "array subscript " } */
diff --git a/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-5.c b/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-5.c
index 30bb4ca8832..dca02288be7 100644
--- a/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-5.c
+++ b/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-5.c
@@ -32,9 +32,9 @@ void __attribute__((__noinline__)) stuff(
struct trailing_array_4 *trailing_flex)
{
normal->c[5] = 5; /*{ dg-warning "array subscript 5 is above array bounds of" } */
- /*{ dg-warning "should not be used as a flexible array member for level 1 and above" "" { target *-*-* } .-1 } */
+ /*{ dg-warning "should not be used as a flexible array member" "" { target *-*-* } .-1 } */
trailing_1->c[2] = 2; /*{ dg-warning "array subscript 2 is above array bounds of" } */
- /* { dg-warning "should not be used as a flexible array member for level 2 and above" "" { target *-*-* } .-1 } */
+ /* { dg-warning "should not be used as a flexible array member" "" { target *-*-* } .-1 } */
trailing_0->c[1] = 1; /* { dg-bogus "array subscript " } */
trailing_flex->c[10] = 10; /* { dg-bogus "array subscript " } */
diff --git a/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-6.c b/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-6.c
index e847a44516e..fc9f73b4535 100644
--- a/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-6.c
+++ b/gcc/testsuite/gcc.dg/Warray-bounds-flex-arrays-6.c
@@ -32,11 +32,11 @@ void __attribute__((__noinline__)) stuff(
struct trailing_array_4 *trailing_flex)
{
normal->c[5] = 5; /*{ dg-warning "array subscript 5 is above array bounds of" } */
- /*{ dg-warning "should not be used as a flexible array member for level 1 and above" "" { target *-*-* } .-1 } */
+ /*{ dg-warning "should not be used as a flexible array member" "" { target *-*-* } .-1 } */
trailing_1->c[2] = 2; /*{ dg-warning "array subscript 2 is above array bounds of" } */
- /* { dg-warning "should not be used as a flexible array member for level 2 and above" "" { target *-*-* } .-1 } */
+ /* { dg-warning "should not be used as a flexible array member" "" { target *-*-* } .-1 } */
trailing_0->c[1] = 1; /*{ dg-warning "array subscript 1 is outside array bounds of" } */
- /* { dg-warning "should not be used as a flexible array member for level 3" "" { target *-*-* } .-1 } */
+ /* { dg-warning "should not be used as a flexible array member" "" { target *-*-* } .-1 } */
trailing_flex->c[10] = 10; /* { dg-bogus "array subscript " } */
}
diff --git a/gcc/testsuite/gcc.dg/Wstrict-flex-arrays-2.c b/gcc/testsuite/gcc.dg/Wstrict-flex-arrays-2.c
index 2e241f96208..befc604f19b 100644
--- a/gcc/testsuite/gcc.dg/Wstrict-flex-arrays-2.c
+++ b/gcc/testsuite/gcc.dg/Wstrict-flex-arrays-2.c
@@ -31,9 +31,9 @@ void __attribute__((__noinline__)) stuff(
struct trailing_array_3 *trailing_0,
struct trailing_array_4 *trailing_flex)
{
- normal->c[5] = 5; /*{ dg-warning "should not be used as a flexible array member for level 1 and above" } */
- trailing_1->c[2] = 2; /* { dg-warning "should not be used as a flexible array member for level 2 and above" } */
- trailing_0->c[1] = 1; /* { dg-bogus "should not be used as a flexible array member for level 2 and above" } */
- trailing_flex->c[10] = 10; /* { dg-bogus "should not be used as a flexible array member for level 2 and above" } */
+ normal->c[5] = 5; /*{ dg-warning "should not be used as a flexible array member" } */
+ trailing_1->c[2] = 2; /* { dg-warning "should not be used as a flexible array member" } */
+ trailing_0->c[1] = 1; /* { dg-bogus "should not be used as a flexible array member" } */
+ trailing_flex->c[10] = 10; /* { dg-bogus "should not be used as a flexible array member" } */
}
diff --git a/gcc/testsuite/gcc.dg/Wstrict-flex-arrays-3.c b/gcc/testsuite/gcc.dg/Wstrict-flex-arrays-3.c
index 97eb65ba0a9..cc37a092c3e 100644
--- a/gcc/testsuite/gcc.dg/Wstrict-flex-arrays-3.c
+++ b/gcc/testsuite/gcc.dg/Wstrict-flex-arrays-3.c
@@ -31,9 +31,9 @@ void __attribute__((__noinline__)) stuff(
struct trailing_array_3 *trailing_0,
struct trailing_array_4 *trailing_flex)
{
- normal->c[5] = 5; /*{ dg-warning "should not be used as a flexible array member for level 1 and above" } */
- trailing_1->c[2] = 2; /* { dg-warning "should not be used as a flexible array member for level 2 and above" } */
- trailing_0->c[1] = 1; /* { dg-warning "should not be used as a flexible array member for level 3" } */
- trailing_flex->c[10] = 10; /* { dg-bogus "should not be used as a flexible array member for level 3" } */
+ normal->c[5] = 5; /*{ dg-warning "should not be used as a flexible array member" } */
+ trailing_1->c[2] = 2; /* { dg-warning "should not be used as a flexible array member" } */
+ trailing_0->c[1] = 1; /* { dg-warning "should not be used as a flexible array member" } */
+ trailing_flex->c[10] = 10; /* { dg-bogus "should not be used as a flexible array member" } */
}
diff --git a/gcc/testsuite/gcc.dg/Wstrict-flex-arrays.c b/gcc/testsuite/gcc.dg/Wstrict-flex-arrays.c
index 110fdc72778..735b23a1dc6 100644
--- a/gcc/testsuite/gcc.dg/Wstrict-flex-arrays.c
+++ b/gcc/testsuite/gcc.dg/Wstrict-flex-arrays.c
@@ -31,9 +31,9 @@ void __attribute__((__noinline__)) stuff(
struct trailing_array_3 *trailing_0,
struct trailing_array_4 *trailing_flex)
{
- normal->c[5] = 5; /*{ dg-warning "should not be used as a flexible array member for level 1 and above" } */
- trailing_1->c[2] = 2; /* { dg-bogus "should not be used as a flexible array member for level 1 and above" } */
- trailing_0->c[1] = 1; /* { dg-bogus "should not be used as a flexible array member for level 1 and above" } */
- trailing_flex->c[10] = 10; /* { dg-bogus "should not be used as a flexible array member for level 1 and above" } */
+ normal->c[5] = 5; /*{ dg-warning "should not be used as a flexible array member" } */
+ trailing_1->c[2] = 2; /* { dg-bogus "should not be used as a flexible array member" } */
+ trailing_0->c[1] = 1; /* { dg-bogus "should not be used as a flexible array member" } */
+ trailing_flex->c[10] = 10; /* { dg-bogus "should not be used as a flexible array member" } */
}
diff --git a/gcc/tree.cc b/gcc/tree.cc
index 78b64ee98b3..7473912a065 100644
--- a/gcc/tree.cc
+++ b/gcc/tree.cc
@@ -13074,38 +13074,15 @@ component_ref_size (tree ref, special_array_member *sam /* = NULL */)
|| *sam == special_array_member::trail_n)
return memsize;
- /* flag_strict_flex_arrays will control how to treat
- the trailing arrays as flexiable array members. */
-
tree afield_decl = TREE_OPERAND (ref, 1);
- unsigned int strict_flex_array_level
- = strict_flex_array_level_of (afield_decl);
-
- switch (strict_flex_array_level)
- {
- case 3:
- /* Treaing 0-length trailing arrays as normal array. */
- if (*sam == special_array_member::trail_0)
- return size_zero_node;
- /* FALLTHROUGH. */
- case 2:
- /* Treating 1-element trailing arrays as normal array. */
- if (*sam == special_array_member::trail_1)
- return memsize;
- /* FALLTHROUGH. */
- case 1:
- /* Treating 2-or-more elements trailing arrays as normal
- array. */
- if (*sam == special_array_member::trail_n)
- return memsize;
- /* FALLTHROUGH. */
- case 0:
- break;
- default:
- gcc_unreachable ();
- }
+ gcc_assert (TREE_CODE (afield_decl) == FIELD_DECL);
+ /* if the trailing array is a not a flexible array member, treat it as
+ a normal array. */
+ if (DECL_NOT_FLEXARRAY (afield_decl)
+ && *sam != special_array_member::int_0)
+ return memsize;
- if (*sam == special_array_member::int_0)
+ if (*sam == special_array_member::int_0)
memsize = NULL_TREE;
/* For a reference to a flexible array member of a union
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