Dynamically composite xml in reply to GDB

GDBserver still uses pre-generated target descriptions in order to
reply to GDB's query on target description (see xml-builtin-generated.c
in GDBserver build directory).  This patch teaches GDBserver to
create XML contents according to the target descriptions rather than
using pre-generated ones.

First, change target feature c files to pass the feature xml file
name to tdesc_create_feature, so that target description in GDBserver
can record them, and create XML contents from these features in
buffer, like

  ...
  <xi:include href="$FEATURE1_XML_NAME"/>
  <xi:include href="$FEATURE2_XML_NAME"/>
  ...

and send this buffer back to GDB.

Note that this patch reuses target_desc.xmltarget a little bit, which is
to hold the XML contents dynamically generated in tdesc_get_features_xml.
However, it is not xfree'ed in ~target_desc, because we can't tell it is
from xstrdup or a literal string.  Since we don't delete target_desc,
there is no memory leak yet.  After we change all target descriptions to
the new style, target_desc.xmltarget is from xstrdup, then, we can safely
xfree it in ~target_desc.

gdb:

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

	* arch/tdesc.h (tdesc_create_feature): Add an argument xml.
	* target-descriptions.c (tdesc_create_feature): Likewise, and
	adjust code.
	* features/i386/32bit-avx.c: Re-generated.
	* features/i386/32bit-avx512.c: Re-generated.
	* features/i386/32bit-core.c: Re-generated.
	* features/i386/32bit-linux.c: Re-generated.
	* features/i386/32bit-mpx.c: Re-generated.
	* features/i386/32bit-pkeys.c: Re-generated.
	* features/i386/32bit-sse.c: Re-generated.

gdb/gdbserver:

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

	* linux-x86-tdesc.c: Don't include <inttypes.h>.
	(i386_linux_read_description) [!IN_PROCESS_AGENT]: Call
	set_tdesc_architecture and set_tdesc_osabi.  Remove code setting
	.xmltarget.
	* server.c (get_features_xml): Call tdesc_get_features_xml.
	* tdesc.c (set_tdesc_architecture): New function.
	(set_tdesc_osabi): New function.
	(tdesc_get_features_xml): New function.
	(tdesc_create_feature): Add an argument.
	* tdesc.h (struct target_desc) <features>: New field.
	<arch, osabi>: New field.
	(~target_desc): xfree features, arch, and osabi.
	(target_desc::oerator==): Don't compare .xmltarget.
	[!IN_PROCESS_AGENT] (set_tdesc_architecture): Declare.
	(set_tdesc_osabi): Likewise.
	(tdesc_get_features_xml): Likewise.

7 files changed, 7 insertions, 7 deletions

diff --git a/gdb/features/i386/32bit-avx.c b/gdb/features/i386/32bit-avx.c
index 3a98936..8a0c356 100644
--- a/gdb/features/i386/32bit-avx.c
+++ b/gdb/features/i386/32bit-avx.c
@@ -8,7 +8,7 @@ create_feature_i386_32bit_avx (struct target_desc *result, long regnum)
 {
   struct tdesc_feature *feature;
 
-  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.avx");
+  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.avx", "32bit-avx.xml");
   tdesc_create_reg (feature, "ymm0h", regnum++, 1, NULL, 128, "uint128");
   tdesc_create_reg (feature, "ymm1h", regnum++, 1, NULL, 128, "uint128");
   tdesc_create_reg (feature, "ymm2h", regnum++, 1, NULL, 128, "uint128");
diff --git a/gdb/features/i386/32bit-avx512.c b/gdb/features/i386/32bit-avx512.c
index b13e1d3..82b20c5 100644
--- a/gdb/features/i386/32bit-avx512.c
+++ b/gdb/features/i386/32bit-avx512.c
@@ -8,7 +8,7 @@ create_feature_i386_32bit_avx512 (struct target_desc *result, long regnum)
 {
   struct tdesc_feature *feature;
 
-  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.avx512");
+  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.avx512", "32bit-avx512.xml");
   struct tdesc_type *field_type;
   field_type = tdesc_named_type (feature, "uint128");
   tdesc_create_vector (feature, "v2ui128", field_type, 2);
diff --git a/gdb/features/i386/32bit-core.c b/gdb/features/i386/32bit-core.c
index ea6db93..ec903f3 100644
--- a/gdb/features/i386/32bit-core.c
+++ b/gdb/features/i386/32bit-core.c
@@ -8,7 +8,7 @@ create_feature_i386_32bit_core (struct target_desc *result, long regnum)
 {
   struct tdesc_feature *feature;
 
-  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.core");
+  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.core", "32bit-core.xml");
   struct tdesc_type *field_type;
   struct tdesc_type *type;
   type = tdesc_create_flags (feature, "i386_eflags", 4);
diff --git a/gdb/features/i386/32bit-linux.c b/gdb/features/i386/32bit-linux.c
index 1ba932d..136e3d7 100644
--- a/gdb/features/i386/32bit-linux.c
+++ b/gdb/features/i386/32bit-linux.c
@@ -8,7 +8,7 @@ create_feature_i386_32bit_linux (struct target_desc *result, long regnum)
 {
   struct tdesc_feature *feature;
 
-  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.linux");
+  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.linux", "32bit-linux.xml");
   regnum = 41;
   tdesc_create_reg (feature, "orig_eax", regnum++, 1, NULL, 32, "int");
   return regnum;
diff --git a/gdb/features/i386/32bit-mpx.c b/gdb/features/i386/32bit-mpx.c
index f7d2ef0..25a3fb1 100644
--- a/gdb/features/i386/32bit-mpx.c
+++ b/gdb/features/i386/32bit-mpx.c
@@ -8,7 +8,7 @@ create_feature_i386_32bit_mpx (struct target_desc *result, long regnum)
 {
   struct tdesc_feature *feature;
 
-  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.mpx");
+  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.mpx", "32bit-mpx.xml");
   struct tdesc_type *field_type;
   struct tdesc_type *type;
   type = tdesc_create_struct (feature, "br128");
diff --git a/gdb/features/i386/32bit-pkeys.c b/gdb/features/i386/32bit-pkeys.c
index 89f1a5b..4ad7649 100644
--- a/gdb/features/i386/32bit-pkeys.c
+++ b/gdb/features/i386/32bit-pkeys.c
@@ -8,7 +8,7 @@ create_feature_i386_32bit_pkeys (struct target_desc *result, long regnum)
 {
   struct tdesc_feature *feature;
 
-  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.pkeys");
+  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.pkeys", "32bit-pkeys.xml");
   tdesc_create_reg (feature, "pkru", regnum++, 1, NULL, 32, "uint32");
   return regnum;
 }
diff --git a/gdb/features/i386/32bit-sse.c b/gdb/features/i386/32bit-sse.c
index 98f4cd0..01b2058 100644
--- a/gdb/features/i386/32bit-sse.c
+++ b/gdb/features/i386/32bit-sse.c
@@ -8,7 +8,7 @@ create_feature_i386_32bit_sse (struct target_desc *result, long regnum)
 {
   struct tdesc_feature *feature;
 
-  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.sse");
+  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.sse", "32bit-sse.xml");
   struct tdesc_type *field_type;
   field_type = tdesc_named_type (feature, "ieee_single");
   tdesc_create_vector (feature, "v4f", field_type, 4);