diff options
| -rw-r--r-- | gnu/packages/patches/gcc-strmov-store-file-names.patch | 50 |
1 files changed, 46 insertions, 4 deletions
diff --git a/gnu/packages/patches/gcc-strmov-store-file-names.patch b/gnu/packages/patches/gcc-strmov-store-file-names.patch index 7951b87616..9f9162855d 100644 --- a/gnu/packages/patches/gcc-strmov-store-file-names.patch +++ b/gnu/packages/patches/gcc-strmov-store-file-names.patch @@ -2,23 +2,43 @@ Make sure that statements such as: strcpy (dst, "/gnu/store/…"); +or + + static const char str[] = "/gnu/store/…"; + … + strcpy (dst, str); + do not result in chunked /gnu/store strings that are undetectable by -Guix's GC and its grafting code. See <http://bugs.gnu.org/24703>. +Guix's GC and its grafting code. See <https://bugs.gnu.org/24703> +and <https://bugs.gnu.org/30395>. + --- gcc-5.3.0/gcc/builtins.c 2016-10-18 10:50:46.080616285 +0200 +++ gcc-5.3.0/gcc/builtins.c 2016-11-09 15:26:43.693042737 +0100 -@@ -3192,6 +3192,42 @@ determine_block_size (tree len, rtx len_ +@@ -3192,6 +3192,54 @@ determine_block_size (tree len, rtx len_ GET_MODE_MASK (GET_MODE (len_rtx))); } ++extern void debug_tree (tree); ++ +/* Return true if STR contains the string "/gnu/store". */ + -+static bool ++bool +store_reference_p (tree str) +{ ++ if (getenv ("GUIX_GCC_DEBUG") != NULL) ++ debug_tree (str); ++ + if (TREE_CODE (str) == ADDR_EXPR) + str = TREE_OPERAND (str, 0); + ++ if (TREE_CODE (str) == VAR_DECL ++ && TREE_STATIC (str) ++ && TREE_READONLY (str)) ++ /* STR may be a 'static const' variable whose initial value ++ is a string constant. See <https://bugs.gnu.org/30395>. */ ++ str = DECL_INITIAL (str); ++ + if (TREE_CODE (str) != STRING_CST) + return false; + @@ -57,10 +77,32 @@ Guix's GC and its grafting code. See <http://bugs.gnu.org/24703>. + /* Do not emit block moves, which translate to the 'movabs' instruction on + x86_64, when SRC refers to store items. That way, store references + remain visible to the Guix GC and grafting code. See -+ <http://bugs.gnu.org/24703>. */ ++ <https://bugs.gnu.org/24703>. */ + if (store_reference_p (src)) + return NULL_RTX; + /* If DEST is not a pointer type, call the normal function. */ if (dest_align == 0) return NULL_RTX; + +--- gcc-5.5.0/gcc/gimple-fold.c 2018-03-20 11:36:16.709442004 +0100 ++++ gcc-5.5.0/gcc/gimple-fold.c 2018-03-20 11:46:43.838487065 +0100 +@@ -769,6 +769,8 @@ var_decl_component_p (tree var) + return SSA_VAR_P (inner); + } + ++extern bool store_reference_p (tree); ++ + /* Fold function call to builtin mem{{,p}cpy,move}. Return + false if no simplification can be made. + If ENDP is 0, return DEST (like memcpy). +@@ -1099,6 +1101,9 @@ gimple_fold_builtin_memory_op (gimple_st + if (!srctype) + return false; + ++ if (store_reference_p (src)) ++ return false; ++ + src_align = get_pointer_alignment (src); + dest_align = get_pointer_alignment (dest); + if (dest_align < TYPE_ALIGN (desttype) |