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, 19 insertions, 15 deletions

diff --git a/gdb/gdbserver/regcache.c b/gdb/gdbserver/regcache.c
index 9b837e7..43e78a5 100644
--- a/gdb/gdbserver/regcache.c
+++ b/gdb/gdbserver/regcache.c
@@ -54,7 +54,7 @@ get_thread_regcache (struct thread_info *thread, int fetch)
       current_thread = thread;
       /* Invalidate all registers, to prevent stale left-overs.  */
       memset (regcache->register_status, REG_UNAVAILABLE,
-	      regcache->tdesc->num_registers);
+	      VEC_length (tdesc_reg_p, regcache->tdesc->reg_defs));
       fetch_inferior_registers (regcache, -1);
       current_thread = saved_thread;
       regcache->registers_valid = 1;
@@ -145,9 +145,9 @@ init_register_cache (struct regcache *regcache,
 	= (unsigned char *) xcalloc (1, tdesc->registers_size);
       regcache->registers_owned = 1;
       regcache->register_status
-	= (unsigned char *) xmalloc (tdesc->num_registers);
+	= (unsigned char *) xmalloc (VEC_length (tdesc_reg_p, tdesc->reg_defs));
       memset ((void *) regcache->register_status, REG_UNAVAILABLE,
-	      tdesc->num_registers);
+	      VEC_length (tdesc_reg_p, tdesc->reg_defs));
 #else
       gdb_assert_not_reached ("can't allocate memory from the heap");
 #endif
@@ -204,7 +204,7 @@ regcache_cpy (struct regcache *dst, struct regcache *src)
 #ifndef IN_PROCESS_AGENT
   if (dst->register_status != NULL && src->register_status != NULL)
     memcpy (dst->register_status, src->register_status,
-	    src->tdesc->num_registers);
+	    VEC_length (tdesc_reg_p, src->tdesc->reg_defs));
 #endif
   dst->registers_valid = src->registers_valid;
 }
@@ -218,8 +218,9 @@ registers_to_string (struct regcache *regcache, char *buf)
   unsigned char *registers = regcache->registers;
   const struct target_desc *tdesc = regcache->tdesc;
   int i;
+  reg *reg;
 
-  for (i = 0; i < tdesc->num_registers; i++)
+  for (i = 0; VEC_iterate (tdesc_reg_p, tdesc->reg_defs, i, reg); i++)
     {
       if (regcache->register_status[i] == REG_VALID)
 	{
@@ -257,22 +258,23 @@ int
 find_regno (const struct target_desc *tdesc, const char *name)
 {
   int i;
+  reg *reg;
 
-  for (i = 0; i < tdesc->num_registers; i++)
-    if (strcmp (name, tdesc->reg_defs[i].name) == 0)
+  for (i = 0; VEC_iterate (tdesc_reg_p, tdesc->reg_defs, i, reg); i++)
+    if (strcmp (name, reg->name) == 0)
       return i;
   internal_error (__FILE__, __LINE__, "Unknown register %s requested",
 		  name);
 }
 
+#endif
+
 struct reg *
 find_register_by_number (const struct target_desc *tdesc, int n)
 {
-  return &tdesc->reg_defs[n];
+  return VEC_index (tdesc_reg_p, tdesc->reg_defs, n);
 }
 
-#endif
-
 #ifndef IN_PROCESS_AGENT
 static void
 free_register_cache_thread (struct thread_info *thread)
@@ -312,7 +314,7 @@ register_cache_size (const struct target_desc *tdesc)
 int
 register_size (const struct target_desc *tdesc, int n)
 {
-  return tdesc->reg_defs[n].size / 8;
+  return find_register_by_number (tdesc, n)->size / 8;
 }
 
 /* See common/common-regcache.h.  */
@@ -326,7 +328,8 @@ regcache_register_size (const struct regcache *regcache, int n)
 static unsigned char *
 register_data (struct regcache *regcache, int n, int fetch)
 {
-  return regcache->registers + regcache->tdesc->reg_defs[n].offset / 8;
+  return (regcache->registers
+	  + find_register_by_number (regcache->tdesc, n)->offset / 8);
 }
 
 /* Supply register N, whose contents are stored in BUF, to REGCACHE.
@@ -385,7 +388,7 @@ supply_regblock (struct regcache *regcache, const void *buf)
       {
 	int i;
 
-	for (i = 0; i < tdesc->num_registers; i++)
+	for (i = 0; i < VEC_length (tdesc_reg_p, tdesc->reg_defs); i++)
 	  regcache->register_status[i] = REG_VALID;
       }
 #endif
@@ -399,7 +402,7 @@ supply_regblock (struct regcache *regcache, const void *buf)
       {
 	int i;
 
-	for (i = 0; i < tdesc->num_registers; i++)
+	for (i = 0; i < VEC_length (tdesc_reg_p, tdesc->reg_defs); i++)
 	  regcache->register_status[i] = REG_UNAVAILABLE;
       }
 #endif
@@ -431,7 +434,8 @@ regcache_raw_read_unsigned (struct regcache *regcache, int regnum,
   int size;
 
   gdb_assert (regcache != NULL);
-  gdb_assert (regnum >= 0 && regnum < regcache->tdesc->num_registers);
+  gdb_assert (regnum >= 0
+	      && regnum < VEC_length (tdesc_reg_p, regcache->tdesc->reg_defs));
 
   size = register_size (regcache->tdesc, regnum);