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[PATCH v2] gdbarch: Use an anonymous union for target data in `gdbarch_info'
- From: "Maciej W. Rozycki" <macro at imgtec dot com>
- To: <gdb-patches at sourceware dot org>
- Cc: Simon Marchi <simon dot marchi at ericsson dot com>, Yao Qi <qiyaoltc at gmail dot com>
- Date: Tue, 1 Aug 2017 16:52:35 +0100
- Subject: [PATCH v2] gdbarch: Use an anonymous union for target data in `gdbarch_info'
- Authentication-results: sourceware.org; auth=none
As an update to commit ede5f15146ae ("gdbarch.h: Change
gdbarch_info::tdep_info's type to void *") replace the definition of the
`tdep_info' member in `struct gdbarch_info' with an anonymous union,
comprising the original member, with its type reverted to `struct
gdbarch_tdep_info *', a `tdesc_data' member of a `struct tdesc_arch_data
*' type and an `id' member of an `int *' type. Remove now unnecessary
casts throughout use places then, making code easier to read an less
prone to errors, which may happen with casting.
gdb/
* gdbarch.sh (gdbarch_info): Replace the `tdep_info' member with
a union of `tdep_info', `tdesc_data' and `id'.
* aarch64-tdep.c (aarch64_gdbarch_init): Use `info.tdesc_data'
rather than `info.tdep_info'.
* amd64-linux-tdep.c (amd64_linux_init_abi): Likewise.
* i386-linux-tdep.c (i386_linux_init_abi): Likewise.
* i386-tdep.c (i386_gdbarch_init): Likewise.
* mips-linux-tdep.c (mips_linux_init_abi): Likewise.
* mips-tdep.c (mips_gdbarch_init): Likewise.
* nds32-tdep.c (nds32_gdbarch_init): Likewise.
* rs6000-tdep.c (rs6000_gdbarch_init): Likewise.
* ppc-linux-tdep.c (ppu2spu_sniffer): Use `info.id' rather than
`info.tdep_info'.
(ppc_linux_init_abi): Use `info.tdesc_data' rather than
`info.tdep_info'.
* sparc-tdep.c (sparc32_gdbarch_init): Likewise.
* spu-multiarch.c (spu_gdbarch): Use `info.id' rather than
`info.tdep_info'.
* spu-tdep.c (spu_gdbarch_init): Likewise.
* gdbarch.h: Regenerate.
---
Hi,
Rebased and updated as requested, see the change log below and:
<https://patchwork.sourceware.org/patch/16622/> for the earlier
discussion. Verified to build with `--enable-targets=all' and no
regressions with `mips-linux-gnu' and `x86_64-linux-gnu' targets.
OK to apply?
Maciej
Changes from v1:
- Descriptions for new union members added.
- SPARC backend modification added according to changes made on master
since the original submission.
---
gdb/aarch64-tdep.c | 2 +-
gdb/amd64-linux-tdep.c | 6 ++----
gdb/gdbarch.h | 16 +++++++++++++++-
gdb/gdbarch.sh | 16 +++++++++++++++-
gdb/i386-linux-tdep.c | 3 +--
gdb/i386-tdep.c | 2 +-
gdb/mips-linux-tdep.c | 3 +--
gdb/mips-tdep.c | 2 +-
gdb/nds32-tdep.c | 2 +-
gdb/ppc-linux-tdep.c | 5 ++---
gdb/rs6000-tdep.c | 2 +-
gdb/sparc-tdep.c | 2 +-
gdb/spu-multiarch.c | 2 +-
gdb/spu-tdep.c | 4 ++--
14 files changed, 45 insertions(+), 22 deletions(-)
gdb-gdbarch-tdep-info-union.diff
Index: binutils/gdb/aarch64-tdep.c
===================================================================
--- binutils.orig/gdb/aarch64-tdep.c 2017-07-31 14:52:02.599875688 +0100
+++ binutils/gdb/aarch64-tdep.c 2017-08-01 14:23:17.929876233 +0100
@@ -2997,7 +2997,7 @@ aarch64_gdbarch_init (struct gdbarch_inf
/* Hook in the ABI-specific overrides, if they have been registered. */
info.target_desc = tdesc;
- info.tdep_info = (void *) tdesc_data;
+ info.tdesc_data = tdesc_data;
gdbarch_init_osabi (info, gdbarch);
dwarf2_frame_set_init_reg (gdbarch, aarch64_dwarf2_frame_init_reg);
Index: binutils/gdb/amd64-linux-tdep.c
===================================================================
--- binutils.orig/gdb/amd64-linux-tdep.c 2017-07-31 21:03:10.055131614 +0100
+++ binutils/gdb/amd64-linux-tdep.c 2017-08-01 14:23:17.944140958 +0100
@@ -1863,8 +1863,7 @@ static void
amd64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- struct tdesc_arch_data *tdesc_data
- = (struct tdesc_arch_data *) info.tdep_info;
+ struct tdesc_arch_data *tdesc_data = info.tdesc_data;
const struct tdesc_feature *feature;
int valid_p;
@@ -2077,8 +2076,7 @@ static void
amd64_x32_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- struct tdesc_arch_data *tdesc_data
- = (struct tdesc_arch_data *) info.tdep_info;
+ struct tdesc_arch_data *tdesc_data = info.tdesc_data;
const struct tdesc_feature *feature;
int valid_p;
Index: binutils/gdb/gdbarch.h
===================================================================
--- binutils.orig/gdb/gdbarch.h 2017-07-31 21:03:13.557252461 +0100
+++ binutils/gdb/gdbarch.h 2017-08-01 16:46:56.895811012 +0100
@@ -1647,7 +1647,21 @@ struct gdbarch_info
bfd *abfd;
/* Use default: NULL (ZERO). */
- void *tdep_info;
+ union
+ {
+ /* Architecture-specific information. The generic form for targets
+ that have extra requirements. */
+ struct gdbarch_tdep_info *tdep_info;
+
+ /* Architecture-specific target description data. Numerous targets
+ need only this, so give them an easy way to hold it. */
+ struct tdesc_arch_data *tdesc_data;
+
+ /* SPU file system ID. This is a single integer, so using the
+ generic form would only complicate code. Other targets may
+ reuse this member if suitable. */
+ int *id;
+ };
/* Use default: GDB_OSABI_UNINITIALIZED (-1). */
enum gdb_osabi osabi;
Index: binutils/gdb/gdbarch.sh
===================================================================
--- binutils.orig/gdb/gdbarch.sh 2017-07-31 21:03:13.569331250 +0100
+++ binutils/gdb/gdbarch.sh 2017-08-01 16:45:30.547572596 +0100
@@ -1474,7 +1474,21 @@ struct gdbarch_info
bfd *abfd;
/* Use default: NULL (ZERO). */
- void *tdep_info;
+ union
+ {
+ /* Architecture-specific information. The generic form for targets
+ that have extra requirements. */
+ struct gdbarch_tdep_info *tdep_info;
+
+ /* Architecture-specific target description data. Numerous targets
+ need only this, so give them an easy way to hold it. */
+ struct tdesc_arch_data *tdesc_data;
+
+ /* SPU file system ID. This is a single integer, so using the
+ generic form would only complicate code. Other targets may
+ reuse this member if suitable. */
+ int *id;
+ };
/* Use default: GDB_OSABI_UNINITIALIZED (-1). */
enum gdb_osabi osabi;
Index: binutils/gdb/i386-linux-tdep.c
===================================================================
--- binutils.orig/gdb/i386-linux-tdep.c 2017-07-31 21:03:14.233751092 +0100
+++ binutils/gdb/i386-linux-tdep.c 2017-08-01 14:23:18.052865360 +0100
@@ -855,8 +855,7 @@ i386_linux_init_abi (struct gdbarch_info
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
const struct target_desc *tdesc = info.target_desc;
- struct tdesc_arch_data *tdesc_data
- = (struct tdesc_arch_data *) info.tdep_info;
+ struct tdesc_arch_data *tdesc_data = info.tdesc_data;
const struct tdesc_feature *feature;
int valid_p;
Index: binutils/gdb/i386-tdep.c
===================================================================
--- binutils.orig/gdb/i386-tdep.c 2017-07-31 14:52:02.635555559 +0100
+++ binutils/gdb/i386-tdep.c 2017-08-01 14:23:18.068046742 +0100
@@ -8604,7 +8604,7 @@ i386_gdbarch_init (struct gdbarch_info i
/* Hook in ABI-specific overrides, if they have been registered.
Note: If INFO specifies a 64 bit arch, this is where we turn
a 32-bit i386 into a 64-bit amd64. */
- info.tdep_info = tdesc_data;
+ info.tdesc_data = tdesc_data;
gdbarch_init_osabi (info, gdbarch);
if (!i386_validate_tdesc_p (tdep, tdesc_data))
Index: binutils/gdb/mips-linux-tdep.c
===================================================================
--- binutils.orig/gdb/mips-linux-tdep.c 2017-07-31 11:12:00.990250331 +0100
+++ binutils/gdb/mips-linux-tdep.c 2017-08-01 14:23:18.120974780 +0100
@@ -1616,8 +1616,7 @@ mips_linux_init_abi (struct gdbarch_info
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum mips_abi abi = mips_abi (gdbarch);
- struct tdesc_arch_data *tdesc_data
- = (struct tdesc_arch_data *) info.tdep_info;
+ struct tdesc_arch_data *tdesc_data = info.tdesc_data;
linux_init_abi (info, gdbarch);
Index: binutils/gdb/mips-tdep.c
===================================================================
--- binutils.orig/gdb/mips-tdep.c 2017-08-01 11:31:16.838764652 +0100
+++ binutils/gdb/mips-tdep.c 2017-08-01 14:23:18.134275124 +0100
@@ -8785,7 +8785,7 @@ mips_gdbarch_init (struct gdbarch_info i
mips_register_g_packet_guesses (gdbarch);
/* Hook in OS ABI-specific overrides, if they have been registered. */
- info.tdep_info = tdesc_data;
+ info.tdesc_data = tdesc_data;
gdbarch_init_osabi (info, gdbarch);
/* The hook may have adjusted num_regs, fetch the final value and
Index: binutils/gdb/nds32-tdep.c
===================================================================
--- binutils.orig/gdb/nds32-tdep.c 2017-07-31 09:19:35.824226786 +0100
+++ binutils/gdb/nds32-tdep.c 2017-08-01 14:23:18.156720737 +0100
@@ -2134,7 +2134,7 @@ nds32_gdbarch_init (struct gdbarch_info
nds32_add_reggroups (gdbarch);
/* Hook in ABI-specific overrides, if they have been registered. */
- info.tdep_info = (void *) tdesc_data;
+ info.tdesc_data = tdesc_data;
gdbarch_init_osabi (info, gdbarch);
/* Override tdesc_register callbacks for system registers. */
Index: binutils/gdb/ppc-linux-tdep.c
===================================================================
--- binutils.orig/gdb/ppc-linux-tdep.c 2017-07-31 09:19:36.292744792 +0100
+++ binutils/gdb/ppc-linux-tdep.c 2017-08-01 14:23:18.180982711 +0100
@@ -1350,7 +1350,7 @@ ppu2spu_sniffer (const struct frame_unwi
info.bfd_arch_info = bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu);
info.byte_order = BFD_ENDIAN_BIG;
info.osabi = GDB_OSABI_LINUX;
- info.tdep_info = &data.id;
+ info.id = &data.id;
data.gdbarch = gdbarch_find_by_info (info);
if (!data.gdbarch)
return 0;
@@ -1650,8 +1650,7 @@ ppc_linux_init_abi (struct gdbarch_info
struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- struct tdesc_arch_data *tdesc_data
- = (struct tdesc_arch_data *) info.tdep_info;
+ struct tdesc_arch_data *tdesc_data = info.tdesc_data;
static const char *const stap_integer_prefixes[] = { "i", NULL };
static const char *const stap_register_indirection_prefixes[] = { "(",
NULL };
Index: binutils/gdb/rs6000-tdep.c
===================================================================
--- binutils.orig/gdb/rs6000-tdep.c 2017-07-31 11:12:01.583503710 +0100
+++ binutils/gdb/rs6000-tdep.c 2017-08-01 14:23:18.195238425 +0100
@@ -6529,7 +6529,7 @@ rs6000_gdbarch_init (struct gdbarch_info
/* Hook in ABI-specific overrides, if they have been registered. */
info.target_desc = tdesc;
- info.tdep_info = tdesc_data;
+ info.tdesc_data = tdesc_data;
gdbarch_init_osabi (info, gdbarch);
switch (info.osabi)
Index: binutils/gdb/sparc-tdep.c
===================================================================
--- binutils.orig/gdb/sparc-tdep.c 2017-07-31 09:19:40.159610319 +0100
+++ binutils/gdb/sparc-tdep.c 2017-08-01 14:23:18.201296672 +0100
@@ -1906,7 +1906,7 @@ sparc32_gdbarch_init (struct gdbarch_inf
}
/* Target description may have changed. */
- info.tdep_info = tdesc_data;
+ info.tdesc_data = tdesc_data;
tdesc_use_registers (gdbarch, tdesc, tdesc_data);
}
Index: binutils/gdb/spu-multiarch.c
===================================================================
--- binutils.orig/gdb/spu-multiarch.c 2017-07-31 09:19:40.344558366 +0100
+++ binutils/gdb/spu-multiarch.c 2017-08-01 14:23:18.210497307 +0100
@@ -107,7 +107,7 @@ spu_gdbarch (int spufs_fd)
info.bfd_arch_info = bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu);
info.byte_order = BFD_ENDIAN_BIG;
info.osabi = GDB_OSABI_LINUX;
- info.tdep_info = &spufs_fd;
+ info.id = &spufs_fd;
return gdbarch_find_by_info (info);
}
Index: binutils/gdb/spu-tdep.c
===================================================================
--- binutils.orig/gdb/spu-tdep.c 2017-07-31 14:52:02.701013577 +0100
+++ binutils/gdb/spu-tdep.c 2017-08-01 14:23:18.271183468 +0100
@@ -2668,8 +2668,8 @@ spu_gdbarch_init (struct gdbarch_info in
int id = -1;
/* Which spufs ID was requested as address space? */
- if (info.tdep_info)
- id = *(int *)info.tdep_info;
+ if (info.id)
+ id = *info.id;
/* For objfile architectures of SPU solibs, decode the ID from the name.
This assumes the filename convention employed by solib-spu.c. */
else if (info.abfd)