Add casts for legitimate integer to enum conversions

This patch is mostly extracted from Pedro's C++ branch.  It adds explicit
casts from integer to enum types, where it is really the intention to do
so.  This could be because we are ...

 * iterating on enum values (we need to iterate on an equivalent integer)
 * converting from a value read from bytes (dwarf attribute, agent
 expression opcode) to the equivalent enum
 * reading the equivalent integer value from another language (Python/Guile)

An exception to that is the casts in regcache.c.  It seems to me like
struct regcache's register_status field could be a pointer to an array of
enum register_status.  Doing so would waste a bit of memory (4 bytes
used by the enum vs 1 byte used by the current signed char, for each
register).  If we switch to C++11 one day, we can define the underlying
type of an enum type, so we could have the best of both worlds.

gdb/ChangeLog:

	* arm-tdep.c (set_fp_model_sfunc): Add cast from integer to enum.
	(arm_set_abi): Likewise.
	* ax-general.c (ax_print): Likewise.
	* c-exp.y (exp : string_exp): Likewise.
	* compile/compile-loc2c.c (compute_stack_depth_worker): Likewise.
	(do_compile_dwarf_expr_to_c): Likewise.
	* cp-name-parser.y (demangler_special : DEMANGLER_SPECIAL start):
	Likewise.
	* dwarf2expr.c (execute_stack_op): Likewise.
	* dwarf2loc.c (dwarf2_compile_expr_to_ax): Likewise.
	(disassemble_dwarf_expression): Likewise.
	* dwarf2read.c (dwarf2_add_member_fn): Likewise.
	(read_array_order): Likewise.
	(abbrev_table_read_table): Likewise.
	(read_attribute_value): Likewise.
	(skip_unknown_opcode): Likewise.
	(dwarf_decode_macro_bytes): Likewise.
	(dwarf_decode_macros): Likewise.
	* eval.c (value_f90_subarray): Likewise.
	* guile/scm-param.c (gdbscm_make_parameter): Likewise.
	* i386-linux-tdep.c (i386_canonicalize_syscall): Likewise.
	* infrun.c (handle_command): Likewise.
	* memory-map.c (memory_map_start_memory): Likewise.
	* osabi.c (set_osabi): Likewise.
	* parse.c (operator_length_standard): Likewise.
	* ppc-linux-tdep.c (ppc_canonicalize_syscall): Likewise, and use
	single return point.
	* python/py-frame.c (gdbpy_frame_stop_reason_string): Likewise.
	* python/py-symbol.c (gdbpy_lookup_symbol): Likewise.
	(gdbpy_lookup_global_symbol): Likewise.
	* record-full.c (record_full_restore): Likewise.
	* regcache.c (regcache_register_status): Likewise.
	(regcache_raw_read): Likewise.
	(regcache_cooked_read): Likewise.
	* rs6000-tdep.c (powerpc_set_vector_abi): Likewise.
	* symtab.c (initialize_ordinary_address_classes): Likewise.
	* target-debug.h (target_debug_print_signals): Likewise.
	* utils.c (do_restore_current_language): Likewise.

1 files changed, 17 insertions, 14 deletions

diff --git a/gdb/ppc-linux-tdep.c b/gdb/ppc-linux-tdep.c
index cf46c2d..69c791e 100644
--- a/gdb/ppc-linux-tdep.c
+++ b/gdb/ppc-linux-tdep.c
@@ -765,29 +765,32 @@ static struct linux_record_tdep ppc64_linux_record_tdep;
 static enum gdb_syscall
 ppc_canonicalize_syscall (int syscall)
 {
+  int result = -1;
+
   if (syscall <= 165)
-    return syscall;
+    result = syscall;
   else if (syscall >= 167 && syscall <= 190)	/* Skip query_module 166 */
-    return syscall + 1;
+    result = syscall + 1;
   else if (syscall >= 192 && syscall <= 197)	/* mmap2 */
-    return syscall;
+    result = syscall;
   else if (syscall == 208)			/* tkill */
-    return gdb_sys_tkill;
+    result = gdb_sys_tkill;
   else if (syscall >= 207 && syscall <= 220)	/* gettid */
-    return syscall + 224 - 207;
+    result = syscall + 224 - 207;
   else if (syscall >= 234 && syscall <= 239)	/* exit_group */
-    return syscall + 252 - 234;
-  else if (syscall >= 240 && syscall <=248)	/* timer_create */
-    return syscall += 259 - 240;
-  else if (syscall >= 250 && syscall <=251)	/* tgkill */
-    return syscall + 270 - 250;
+    result = syscall + 252 - 234;
+  else if (syscall >= 240 && syscall <= 248)	/* timer_create */
+    result = syscall += 259 - 240;
+  else if (syscall >= 250 && syscall <= 251)	/* tgkill */
+    result = syscall + 270 - 250;
   else if (syscall == 336)
-    return gdb_sys_recv;
+    result = gdb_sys_recv;
   else if (syscall == 337)
-    return gdb_sys_recvfrom;
+    result = gdb_sys_recvfrom;
   else if (syscall == 342)
-    return gdb_sys_recvmsg;
-  return -1;
+    result = gdb_sys_recvmsg;
+
+  return (enum gdb_syscall) result;
 }
 
 /* Record registers which might be clobbered during system call.