Fix rtx_code_size static initialization order fiasco

r264556 and r264537 changed the format of EQ_ATTR_ALT RTXs to "ww",
which also required adjusting rtx_code_size initializer.  In order to
simplify things, the list of rtx_codes known to use HOST_WIDE_INTs was
replaced by the format string check.  However, unlike the old one, this
new check cannot be always performed at compile time, in which case a
static constructor is generated.  This may lead to a static
initialization order fiasco with respect to other static constructors
in the compiler, in case of PR87747, cselib's pool_allocator.

gcc/ChangeLog:

2018-10-25  Ilya Leoshkevich  <iii@linux.ibm.com>

	PR bootstrap/87747
	* rtl.c (RTX_CODE_HWINT_P_1): New helper macro.
	(RTX_CODE_HWINT_P): New macro.
	(rtx_code_size): Use RTX_CODE_HWINT_P ().

From-SVN: r265488

1 files changed, 13 insertions, 1 deletions

diff --git a/gcc/rtl.c b/gcc/rtl.c
index ca5c25c..86a40b1 100644
--- a/gcc/rtl.c
+++ b/gcc/rtl.c
@@ -106,11 +106,23 @@ const enum rtx_class rtx_class[NUM_RTX_CODE] = {
 #undef DEF_RTL_EXPR
 };
 
+/* Whether rtxs with the given code code store data in the hwint field.  */
+
+#define RTX_CODE_HWINT_P_1(ENUM)					\
+    ((ENUM) == CONST_INT || (ENUM) == CONST_DOUBLE			\
+     || (ENUM) == CONST_FIXED || (ENUM) == CONST_WIDE_INT)
+#ifdef GENERATOR_FILE
+#define RTX_CODE_HWINT_P(ENUM)						\
+    (RTX_CODE_HWINT_P_1 (ENUM) || (ENUM) == EQ_ATTR_ALT)
+#else
+#define RTX_CODE_HWINT_P RTX_CODE_HWINT_P_1
+#endif
+
 /* Indexed by rtx code, gives the size of the rtx in bytes.  */
 
 const unsigned char rtx_code_size[NUM_RTX_CODE] = {
 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)				\
-  ((FORMAT)[0] == 'w'							\
+  (RTX_CODE_HWINT_P (ENUM)						\
    ? RTX_HDR_SIZE + (sizeof FORMAT - 1) * sizeof (HOST_WIDE_INT)	\
    : (ENUM) == REG							\
    ? RTX_HDR_SIZE + sizeof (reg_info)					\