Use VEC for target_desc.reg_defs

Nowadays, target_desc.reg_defs is a pointer points to a pre-generated
array, which is not flexible.  This patch changes it from an array
to a VEC so that GDBserver can create target descriptions dynamically
later.  Instead of using pre-generated array, the -generated.c calls
VEC_safe_push to add each register to vector.

Since target_desc.reg_defs is used in IPA, we need to build common/vec.c
for IPA too.

gdb/gdbserver:

2017-09-05  Yao Qi  <yao.qi@linaro.org>

	* Makefile.in (IPA_OBJS): Add vec-ipa.o
	* regcache.c (get_thread_regcache): Use VEC_length.
	(init_register_cache): Likewise.
	(regcache_cpy): Likewise.
	(registers_to_string): Iterate reg_defs via VEC_iterate.
	(find_regno): Likewise.
	(find_register_by_number): Use VEC_index.
	(register_size): Call find_register_by_number.
	(register_data): Call find_register_by_number.
	(supply_regblock): Use VEC_length.
	(regcache_raw_read_unsigned): Likewise.
	* tdesc.c (init_target_desc): Iterate reg_defs via
	VEC_iterate.
	(default_description): Update initializer.
	(copy_target_description): Don't update field num_registers.
	* tdesc.h (struct target_desc) <reg_defs>: Change it to VEC.
	<num_registers>: Remove.

gdb:

2017-09-05  Yao Qi  <yao.qi@linaro.org>

	* regformats/regdat.sh: Update generated code.

1 files changed, 7 insertions, 6 deletions

diff --git a/gdb/regformats/regdat.sh b/gdb/regformats/regdat.sh
index 2c764cd..236cd93 100755
--- a/gdb/regformats/regdat.sh
+++ b/gdb/regformats/regdat.sh
@@ -131,8 +131,8 @@ do
     echo "{"
     echo "  static struct target_desc tdesc_${name}_s;"
     echo "  struct target_desc *result = &tdesc_${name}_s;"
+    echo "  memset (result, 0, sizeof (*result));"
 
-    echo "static struct reg regs_${name}[] = {"
     continue
   elif test "${type}" = "xmltarget"; then
     xmltarget="${entry}"
@@ -150,13 +150,17 @@ do
     echo "$0: $1 does not specify \`\`name''." 1>&2
     exit 1
   else
-    echo "  { \"${entry}\", ${offset}, ${type} },"
+    echo "  {struct reg *reg = XCNEW (struct reg);"
+    echo "  reg->name = \"${entry}\";"
+    echo "  reg->offset = ${offset};"
+    echo "  reg->size = ${type};"
+    echo "  VEC_safe_push (tdesc_reg_p, result->reg_defs, reg);"
+    echo "  };"
     offset=`expr ${offset} + ${type}`
     i=`expr $i + 1`
   fi
 done
 
-echo "};"
 echo
 echo "static const char *expedite_regs_${name}[] = { \"`echo ${expedite} | sed 's/,/", "/g'`\", 0 };"
 if test "${xmltarget}" = x; then
@@ -178,9 +182,6 @@ fi
 echo
 
 cat <<EOF
-  result->reg_defs = regs_${name};
-  result->num_registers = sizeof (regs_${name}) / sizeof (regs_${name}[0]);
-
 #ifndef IN_PROCESS_AGENT
   result->expedite_regs = expedite_regs_${name};
   result->xmltarget = xmltarget_${name};