[PATCH mainline/7.12.1] Create tdep->rl78_psw_type lazily

[Yao Qi <qiyaoltc at gmail dot com>]

I build GDB for all targets enabled.  When I "set architecture rl78",
GDB crashes,

(gdb) set architecture rl78

Program received signal SIGSEGV, Segmentation fault.
append_flags_type_flag (type=0x20cc0e0, bitpos=bitpos@entry=0, name=name@entry=0x11dba3f "CY") at ../../binutils-gdb/gdb/gdbtypes.c:4926
4926				   name);
(gdb) bt 10
 #0  append_flags_type_flag (type=0x20cc0e0, bitpos=bitpos@entry=0, name=name@entry=0x11dba3f "CY") at ../../binutils-gdb/gdb/gdbtypes.c:4926
 #1  0x00000000004aaca8 in rl78_gdbarch_init (info=..., arches=<optimized out>) at ../../binutils-gdb/gdb/rl78-tdep.c:1410
 #2  0x00000000006b05a4 in gdbarch_find_by_info (info=...) at ../../binutils-gdb/gdb/gdbarch.c:5269
 #3  0x000000000060eee4 in gdbarch_update_p (info=...) at ../../binutils-gdb/gdb/arch-utils.c:557
 #4  0x000000000060f8a8 in set_architecture (ignore_args=<optimized out>, from_tty=1, c=<optimized out>) at ../../binutils-gdb/gdb/arch-utils.c:531
 #5  0x0000000000593d0b in do_set_command (arg=<optimized out>, arg@entry=0x20be851 "rl78", from_tty=from_tty@entry=1, c=c@entry=0x20b1540)
    at ../../binutils-gdb/gdb/cli/cli-setshow.c:455
 #6  0x00000000007665c3 in execute_command (p=<optimized out>, p@entry=0x20be840 "set architecture rl78", from_tty=1) at ../../binutils-gdb/gdb/top.c:666
 #7  0x00000000006935f4 in command_handler (command=0x20be840 "set architecture rl78") at ../../binutils-gdb/gdb/event-top.c:577
 #8  0x00000000006938d8 in command_line_handler (rl=<optimized out>) at ../../binutils-gdb/gdb/event-top.c:767
 #9  0x0000000000692c2c in gdb_rl_callback_handler (rl=0x20be890 "") at ../../binutils-gdb/gdb/event-top.c:200

The cause is that we want to access some builtin types in gdbarch init, but
it is not initialized yet.  I fix it by creating the type when it is to be
used.  We've already done this in sparc, sparc64 and m68k.

gdb:

2016-12-09  Yao Qi  <yao.qi@linaro.org>

	PR tdep/20953
	* rl78-tdep.c (rl78_psw_type): New function.
	(rl78_register_type): Call rl78_psw_type.
	(rl78_gdbarch_init): Move code to rl78_psw_type.
---
 gdb/rl78-tdep.c | 36 +++++++++++++++++++++++++-----------
 1 file changed, 25 insertions(+), 11 deletions(-)

diff --git a/gdb/rl78-tdep.c b/gdb/rl78-tdep.c
index 95a26a5..0e88fbc 100644
--- a/gdb/rl78-tdep.c
+++ b/gdb/rl78-tdep.c
@@ -261,6 +261,30 @@ struct rl78_prologue
   int reg_offset[RL78_NUM_TOTAL_REGS];
 };
 
+/* Construct type for PSW register.  */
+
+static struct type *
+rl78_psw_type (struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  if (tdep->rl78_psw_type == NULL)
+    {
+      tdep->rl78_psw_type = arch_flags_type (gdbarch,
+					     "builtin_type_rl78_psw", 1);
+      append_flags_type_flag (tdep->rl78_psw_type, 0, "CY");
+      append_flags_type_flag (tdep->rl78_psw_type, 1, "ISP0");
+      append_flags_type_flag (tdep->rl78_psw_type, 2, "ISP1");
+      append_flags_type_flag (tdep->rl78_psw_type, 3, "RBS0");
+      append_flags_type_flag (tdep->rl78_psw_type, 4, "AC");
+      append_flags_type_flag (tdep->rl78_psw_type, 5, "RBS1");
+      append_flags_type_flag (tdep->rl78_psw_type, 6, "Z");
+      append_flags_type_flag (tdep->rl78_psw_type, 7, "IE");
+    }
+
+  return tdep->rl78_psw_type;
+}
+
 /* Implement the "register_type" gdbarch method.  */
 
 static struct type *
@@ -273,7 +297,7 @@ rl78_register_type (struct gdbarch *gdbarch, int reg_nr)
   else if (reg_nr == RL78_RAW_PC_REGNUM)
     return tdep->rl78_uint32;
   else if (reg_nr == RL78_PSW_REGNUM)
-    return (tdep->rl78_psw_type);
+    return rl78_psw_type (gdbarch);
   else if (reg_nr <= RL78_MEM_REGNUM
            || (RL78_X_REGNUM <= reg_nr && reg_nr <= RL78_H_REGNUM)
 	   || (RL78_BANK0_R0_REGNUM <= reg_nr
@@ -1406,16 +1430,6 @@ rl78_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   tdep->rl78_code_pointer
     = arch_pointer_type (gdbarch, 32, "rl78_code_addr_t", tdep->rl78_void);
 
-  tdep->rl78_psw_type = arch_flags_type (gdbarch, "builtin_type_rl78_psw", 1);
-  append_flags_type_flag (tdep->rl78_psw_type, 0, "CY");
-  append_flags_type_flag (tdep->rl78_psw_type, 1, "ISP0");
-  append_flags_type_flag (tdep->rl78_psw_type, 2, "ISP1");
-  append_flags_type_flag (tdep->rl78_psw_type, 3, "RBS0");
-  append_flags_type_flag (tdep->rl78_psw_type, 4, "AC");
-  append_flags_type_flag (tdep->rl78_psw_type, 5, "RBS1");
-  append_flags_type_flag (tdep->rl78_psw_type, 6, "Z");
-  append_flags_type_flag (tdep->rl78_psw_type, 7, "IE");
-
   /* Registers.  */
   set_gdbarch_num_regs (gdbarch, RL78_NUM_REGS);
   set_gdbarch_num_pseudo_regs (gdbarch, RL78_NUM_PSEUDO_REGS);
-- 
1.9.1