[RFC] LONGEST and ULONGEST function template instantiation
Yao Qi
qiyaoltc@gmail.com
Thu Jun 15 11:59:00 GMT 2017
Pedro Alves <palves@redhat.com> writes:
Hi Pedro,
I pick up your patch, and update the ChangeLog entry.
> The version below has no impact on code size:
>
> $ size gdb.before gdb.after
> text data bss dec hex filename
> 7535236 125008 181184 7841428 77a694 gdb.before
> 7535236 125008 181184 7841428 77a694 gdb.after
I can't reproduce your result with gcc 5.4.0 on Ubuntu 16.04. The
patched GDB size increased by 112, but it doesn't matter.
before:
$ size ./gdb
text data bss dec hex filename
7733505 144208 180768 8058481 7af671 ./gdb
after:
$ size ./gdb
text data bss dec hex filename
7733617 144208 180768 8058593 7af6e1 ./gdb
--
Yao (齐尧)
From cb61b39bb2a35e6ac81dce31019e3dabbc111292 Mon Sep 17 00:00:00 2001
From: Yao Qi <yao.qi@linaro.org>
Date: Thu, 15 Jun 2017 11:06:58 +0100
Subject: [PATCH] extract/store integer function template
This patch converts functions extract_{unsigned,signed}_integer
to a function template extract_integer, which has two instantiations. It
also does the similar changes to store__{unsigned,signed}_integer,
regcache::raw_read_{unsigned,signed}, regcache::raw_write_{unsigned,signed},
regcache::cooked_read_{unsigned,signed},
regcache::cooked_write_{unsigned,signed}.
This patch was posted here
https://sourceware.org/ml/gdb-patches/2017-05/msg00492.html but the
problem was fixed in a different way. However, I think the patch is still
useful to shorten the code.
gdb:
2017-06-15 Alan Hayward <alan.hayward@arm.com>
Pedro Alves <palves@redhat.com>
Yao Qi <yao.qi@linaro.org>
* defs.h (RequireLongest): New.
(extract_integer): Declare function template.
(extract_signed_integer): Remove the declaration, but define it
static inline.
(extract_unsigned_integer): Likewise.
(store_integer): Declare function template.
(store_signed_integer): Remove the declaration, but define it
static inline.
(store_unsigned_integer): Likewise.
* findvar.c (extract_integer): New function template.
(extract_signed_integer): Remove.
(extract_unsigned_integer): Remove.
(extract_integer<LONGEST>, extract_integer<ULONGEST>): Explicit
instantiations.
(store_integer): New function template.
(store_signed_integer): Remove.
(store_unsigned_integer): Remove.
(store_integer): Explicit instantiations.
* regcache.c (regcache_raw_read_signed): Update.
(regcache::raw_read): New function.
(regcache::raw_read_signed): Remove.
(regcache::raw_read_unsigned): Remove.
(regcache_raw_read_unsigned): Update.
(regcache_raw_write_unsigned): Update.
(regcache::raw_write_signed): Remove.
(regcache::raw_write): New function.
(regcache_cooked_read_signed): Update.
(regcache::raw_write_unsigned): Remove.
(regcache::cooked_read_signed): Remove.
(regcache_cooked_read_unsigned): Update.
(regcache::cooked_read_unsigned): Remove.
(regcache_cooked_write_signed): Update.
(regcache_cooked_write_unsigned): Update.
* regcache.h (regcache) <raw_read_signed>: Remove.
<raw_write_signed, raw_read_unsigned, raw_write_unsigned>: Remove.
<raw_read, raw_write>: New.
<cooked_read_signed, cooked_write_signed>: Remove.
<cooked_write_unsigned, cooked_read_unsigned>: Remove.
<cooked_read, cooked_write>: New.
* sh64-tdep.c (sh64_pseudo_register_read): Update.
(sh64_pseudo_register_write): Update.
diff --git a/gdb/defs.h b/gdb/defs.h
index a1a97bb..55d16d1 100644
--- a/gdb/defs.h
+++ b/gdb/defs.h
@@ -82,6 +82,11 @@ enum compile_i_scope_types
COMPILE_I_PRINT_VALUE_SCOPE,
};
+
+template<typename T>
+using RequireLongest = gdb::Requires<gdb::Or<std::is_same<T, LONGEST>,
+ std::is_same<T, ULONGEST>>>;
+
/* Just in case they're not defined in stdio.h. */
#ifndef SEEK_SET
@@ -637,11 +642,22 @@ enum { MAX_REGISTER_SIZE = 64 };
/* In findvar.c. */
-extern LONGEST extract_signed_integer (const gdb_byte *, int,
- enum bfd_endian);
+template<typename T, typename = RequireLongest<T>>
+T extract_integer (const gdb_byte *addr, int len, enum bfd_endian byte_order);
-extern ULONGEST extract_unsigned_integer (const gdb_byte *, int,
- enum bfd_endian);
+static inline LONGEST
+extract_signed_integer (const gdb_byte *addr, int len,
+ enum bfd_endian byte_order)
+{
+ return extract_integer<LONGEST> (addr, len, byte_order);
+}
+
+static inline ULONGEST
+extract_unsigned_integer (const gdb_byte *addr, int len,
+ enum bfd_endian byte_order)
+{
+ return extract_integer<ULONGEST> (addr, len, byte_order);
+}
extern int extract_long_unsigned_integer (const gdb_byte *, int,
enum bfd_endian, LONGEST *);
@@ -649,11 +665,26 @@ extern int extract_long_unsigned_integer (const gdb_byte *, int,
extern CORE_ADDR extract_typed_address (const gdb_byte *buf,
struct type *type);
-extern void store_signed_integer (gdb_byte *, int,
- enum bfd_endian, LONGEST);
+/* All 'store' functions accept a host-format integer and store a
+ target-format integer at ADDR which is LEN bytes long. */
-extern void store_unsigned_integer (gdb_byte *, int,
- enum bfd_endian, ULONGEST);
+template<typename T, typename = RequireLongest<T>>
+extern void store_integer (gdb_byte *addr, int len, enum bfd_endian byte_order,
+ T val);
+
+static inline void
+store_signed_integer (gdb_byte *addr, int len,
+ enum bfd_endian byte_order, LONGEST val)
+{
+ return store_integer (addr, len, byte_order, val);
+}
+
+static inline void
+store_unsigned_integer (gdb_byte *addr, int len,
+ enum bfd_endian byte_order, ULONGEST val)
+{
+ return store_integer (addr, len, byte_order, val);
+}
extern void store_typed_address (gdb_byte *buf, struct type *type,
CORE_ADDR addr);
diff --git a/gdb/findvar.c b/gdb/findvar.c
index 6c18e25..beb127e 100644
--- a/gdb/findvar.c
+++ b/gdb/findvar.c
@@ -47,70 +47,54 @@
you lose
#endif
-LONGEST
-extract_signed_integer (const gdb_byte *addr, int len,
- enum bfd_endian byte_order)
+template<typename T, typename>
+T
+extract_integer (const gdb_byte *addr, int len, enum bfd_endian byte_order)
{
- LONGEST retval;
+ T retval = 0;
const unsigned char *p;
const unsigned char *startaddr = addr;
const unsigned char *endaddr = startaddr + len;
- if (len > (int) sizeof (LONGEST))
+ if (len > (int) sizeof (T))
error (_("\
That operation is not available on integers of more than %d bytes."),
- (int) sizeof (LONGEST));
+ (int) sizeof (T));
/* Start at the most significant end of the integer, and work towards
the least significant. */
if (byte_order == BFD_ENDIAN_BIG)
{
p = startaddr;
- /* Do the sign extension once at the start. */
- retval = ((LONGEST) * p ^ 0x80) - 0x80;
- for (++p; p < endaddr; ++p)
+ if (std::is_signed<T>::value)
+ {
+ /* Do the sign extension once at the start. */
+ retval = ((LONGEST) * p ^ 0x80) - 0x80;
+ ++p;
+ }
+ for (; p < endaddr; ++p)
retval = (retval << 8) | *p;
}
else
{
p = endaddr - 1;
- /* Do the sign extension once at the start. */
- retval = ((LONGEST) * p ^ 0x80) - 0x80;
- for (--p; p >= startaddr; --p)
+ if (std::is_signed<T>::value)
+ {
+ /* Do the sign extension once at the start. */
+ retval = ((LONGEST) * p ^ 0x80) - 0x80;
+ --p;
+ }
+ for (; p >= startaddr; --p)
retval = (retval << 8) | *p;
}
return retval;
}
-ULONGEST
-extract_unsigned_integer (const gdb_byte *addr, int len,
- enum bfd_endian byte_order)
-{
- ULONGEST retval;
- const unsigned char *p;
- const unsigned char *startaddr = addr;
- const unsigned char *endaddr = startaddr + len;
-
- if (len > (int) sizeof (ULONGEST))
- error (_("\
-That operation is not available on integers of more than %d bytes."),
- (int) sizeof (ULONGEST));
-
- /* Start at the most significant end of the integer, and work towards
- the least significant. */
- retval = 0;
- if (byte_order == BFD_ENDIAN_BIG)
- {
- for (p = startaddr; p < endaddr; ++p)
- retval = (retval << 8) | *p;
- }
- else
- {
- for (p = endaddr - 1; p >= startaddr; --p)
- retval = (retval << 8) | *p;
- }
- return retval;
-}
+/* Explicit instantiations. */
+template LONGEST extract_integer<LONGEST> (const gdb_byte *addr, int len,
+ enum bfd_endian byte_order);
+template ULONGEST extract_integer<ULONGEST> (const gdb_byte *addr, int len,
+ enum bfd_endian byte_order);
/* Sometimes a long long unsigned integer can be extracted as a
LONGEST value. This is done so that we can print these values
@@ -180,10 +164,10 @@ extract_typed_address (const gdb_byte *buf, struct type *type)
/* All 'store' functions accept a host-format integer and store a
target-format integer at ADDR which is LEN bytes long. */
-
+template<typename T, typename>
void
-store_signed_integer (gdb_byte *addr, int len,
- enum bfd_endian byte_order, LONGEST val)
+store_integer (gdb_byte *addr, int len, enum bfd_endian byte_order,
+ T val)
{
gdb_byte *p;
gdb_byte *startaddr = addr;
@@ -209,33 +193,14 @@ store_signed_integer (gdb_byte *addr, int len,
}
}
-void
-store_unsigned_integer (gdb_byte *addr, int len,
- enum bfd_endian byte_order, ULONGEST val)
-{
- unsigned char *p;
- unsigned char *startaddr = (unsigned char *) addr;
- unsigned char *endaddr = startaddr + len;
+/* Explicit instantiations. */
+template void store_integer (gdb_byte *addr, int len,
+ enum bfd_endian byte_order,
+ LONGEST val);
- /* Start at the least significant end of the integer, and work towards
- the most significant. */
- if (byte_order == BFD_ENDIAN_BIG)
- {
- for (p = endaddr - 1; p >= startaddr; --p)
- {
- *p = val & 0xff;
- val >>= 8;
- }
- }
- else
- {
- for (p = startaddr; p < endaddr; ++p)
- {
- *p = val & 0xff;
- val >>= 8;
- }
- }
-}
+template void store_integer (gdb_byte *addr, int len,
+ enum bfd_endian byte_order,
+ ULONGEST val);
/* Store the address ADDR as a pointer of type TYPE at BUF, in target
form. */
diff --git a/gdb/regcache.c b/gdb/regcache.c
index 43ea430..7eeb737 100644
--- a/gdb/regcache.c
+++ b/gdb/regcache.c
@@ -662,11 +662,12 @@ enum register_status
regcache_raw_read_signed (struct regcache *regcache, int regnum, LONGEST *val)
{
gdb_assert (regcache != NULL);
- return regcache->raw_read_signed (regnum, val);
+ return regcache->raw_read (regnum, val);
}
+template<typename T, typename>
enum register_status
-regcache::raw_read_signed (int regnum, LONGEST *val)
+regcache::raw_read (int regnum, T *val)
{
gdb_byte *buf;
enum register_status status;
@@ -675,9 +676,9 @@ regcache::raw_read_signed (int regnum, LONGEST *val)
buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]);
status = raw_read (regnum, buf);
if (status == REG_VALID)
- *val = extract_signed_integer
- (buf, m_descr->sizeof_register[regnum],
- gdbarch_byte_order (m_descr->gdbarch));
+ *val = extract_integer<T> (buf,
+ m_descr->sizeof_register[regnum],
+ gdbarch_byte_order (m_descr->gdbarch));
else
*val = 0;
return status;
@@ -688,44 +689,26 @@ regcache_raw_read_unsigned (struct regcache *regcache, int regnum,
ULONGEST *val)
{
gdb_assert (regcache != NULL);
- return regcache->raw_read_unsigned (regnum, val);
-}
-
-
-enum register_status
-regcache::raw_read_unsigned (int regnum, ULONGEST *val)
-{
- gdb_byte *buf;
- enum register_status status;
-
- gdb_assert (regnum >= 0 && regnum < m_descr->nr_raw_registers);
- buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]);
- status = raw_read (regnum, buf);
- if (status == REG_VALID)
- *val = extract_unsigned_integer
- (buf, m_descr->sizeof_register[regnum],
- gdbarch_byte_order (m_descr->gdbarch));
- else
- *val = 0;
- return status;
+ return regcache->raw_read (regnum, val);
}
void
regcache_raw_write_signed (struct regcache *regcache, int regnum, LONGEST val)
{
gdb_assert (regcache != NULL);
- regcache->raw_write_signed (regnum, val);
+ regcache->raw_write (regnum, val);
}
+template<typename T, typename>
void
-regcache::raw_write_signed (int regnum, LONGEST val)
+regcache::raw_write (int regnum, T val)
{
gdb_byte *buf;
gdb_assert (regnum >=0 && regnum < m_descr->nr_raw_registers);
buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]);
- store_signed_integer (buf, m_descr->sizeof_register[regnum],
- gdbarch_byte_order (m_descr->gdbarch), val);
+ store_integer (buf, m_descr->sizeof_register[regnum],
+ gdbarch_byte_order (m_descr->gdbarch), val);
raw_write (regnum, buf);
}
@@ -734,19 +717,7 @@ regcache_raw_write_unsigned (struct regcache *regcache, int regnum,
ULONGEST val)
{
gdb_assert (regcache != NULL);
- regcache->raw_write_unsigned (regnum, val);
-}
-
-void
-regcache::raw_write_unsigned (int regnum, ULONGEST val)
-{
- gdb_byte *buf;
-
- gdb_assert (regnum >=0 && regnum < m_descr->nr_raw_registers);
- buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]);
- store_unsigned_integer (buf, m_descr->sizeof_register[regnum],
- gdbarch_byte_order (m_descr->gdbarch), val);
- raw_write (regnum, buf);
+ regcache->raw_write (regnum, val);
}
LONGEST
@@ -857,11 +828,12 @@ regcache_cooked_read_signed (struct regcache *regcache, int regnum,
LONGEST *val)
{
gdb_assert (regcache != NULL);
- return regcache->cooked_read_signed (regnum, val);
+ return regcache->cooked_read (regnum, val);
}
+template<typename T, typename>
enum register_status
-regcache::cooked_read_signed (int regnum, LONGEST *val)
+regcache::cooked_read (int regnum, T *val)
{
enum register_status status;
gdb_byte *buf;
@@ -870,9 +842,8 @@ regcache::cooked_read_signed (int regnum, LONGEST *val)
buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]);
status = cooked_read (regnum, buf);
if (status == REG_VALID)
- *val = extract_signed_integer
- (buf, m_descr->sizeof_register[regnum],
- gdbarch_byte_order (m_descr->gdbarch));
+ *val = extract_integer<T> (buf, m_descr->sizeof_register[regnum],
+ gdbarch_byte_order (m_descr->gdbarch));
else
*val = 0;
return status;
@@ -883,25 +854,7 @@ regcache_cooked_read_unsigned (struct regcache *regcache, int regnum,
ULONGEST *val)
{
gdb_assert (regcache != NULL);
- return regcache->cooked_read_unsigned (regnum, val);
-}
-
-enum register_status
-regcache::cooked_read_unsigned (int regnum, ULONGEST *val)
-{
- enum register_status status;
- gdb_byte *buf;
-
- gdb_assert (regnum >= 0 && regnum < m_descr->nr_cooked_registers);
- buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]);
- status = cooked_read (regnum, buf);
- if (status == REG_VALID)
- *val = extract_unsigned_integer
- (buf, m_descr->sizeof_register[regnum],
- gdbarch_byte_order (m_descr->gdbarch));
- else
- *val = 0;
- return status;
+ return regcache->cooked_read (regnum, val);
}
void
@@ -909,18 +862,19 @@ regcache_cooked_write_signed (struct regcache *regcache, int regnum,
LONGEST val)
{
gdb_assert (regcache != NULL);
- regcache->cooked_write_signed (regnum, val);
+ regcache->cooked_write (regnum, val);
}
+template<typename T, typename>
void
-regcache::cooked_write_signed (int regnum, LONGEST val)
+regcache::cooked_write (int regnum, T val)
{
gdb_byte *buf;
gdb_assert (regnum >=0 && regnum < m_descr->nr_cooked_registers);
buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]);
- store_signed_integer (buf, m_descr->sizeof_register[regnum],
- gdbarch_byte_order (m_descr->gdbarch), val);
+ store_integer (buf, m_descr->sizeof_register[regnum],
+ gdbarch_byte_order (m_descr->gdbarch), val);
cooked_write (regnum, buf);
}
@@ -929,19 +883,7 @@ regcache_cooked_write_unsigned (struct regcache *regcache, int regnum,
ULONGEST val)
{
gdb_assert (regcache != NULL);
- regcache->cooked_write_unsigned (regnum, val);
-}
-
-void
-regcache::cooked_write_unsigned (int regnum, ULONGEST val)
-{
- gdb_byte *buf;
-
- gdb_assert (regnum >=0 && regnum < m_descr->nr_cooked_registers);
- buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]);
- store_unsigned_integer (buf, m_descr->sizeof_register[regnum],
- gdbarch_byte_order (m_descr->gdbarch), val);
- cooked_write (regnum, buf);
+ regcache->cooked_write (regnum, val);
}
/* See regcache.h. */
diff --git a/gdb/regcache.h b/gdb/regcache.h
index 4cf27a0..3f3f823 100644
--- a/gdb/regcache.h
+++ b/gdb/regcache.h
@@ -282,23 +282,19 @@ public:
#endif
void raw_write (int regnum, const gdb_byte *buf);
- enum register_status raw_read_signed (int regnum, LONGEST *val);
+ template<typename T, typename = RequireLongest<T>>
+ enum register_status raw_read (int regnum, T *val);
- void raw_write_signed (int regnum, LONGEST val);
-
- enum register_status raw_read_unsigned (int regnum, ULONGEST *val);
-
- void raw_write_unsigned (int regnum, ULONGEST val);
+ template<typename T, typename = RequireLongest<T>>
+ void raw_write (int regnum, T val);
struct value *cooked_read_value (int regnum);
- enum register_status cooked_read_signed (int regnum, LONGEST *val);
-
- void cooked_write_signed (int regnum, LONGEST val);
-
- enum register_status cooked_read_unsigned (int regnum, ULONGEST *val);
+ template<typename T, typename = RequireLongest<T>>
+ enum register_status cooked_read (int regnum, T *val);
- void cooked_write_unsigned (int regnum, ULONGEST val);
+ template<typename T, typename = RequireLongest<T>>
+ void cooked_write (int regnum, T val);
void raw_update (int regnum);
diff --git a/gdb/sh64-tdep.c b/gdb/sh64-tdep.c
index dd18e9f..5aeb235 100644
--- a/gdb/sh64-tdep.c
+++ b/gdb/sh64-tdep.c
@@ -1665,11 +1665,11 @@ sh64_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
*/
/* *INDENT-ON* */
/* Get FPSCR as an int. */
- status = regcache->raw_read_unsigned (fpscr_base_regnum, &fpscr_value);
+ status = regcache->raw_read (fpscr_base_regnum, &fpscr_value);
if (status != REG_VALID)
return status;
/* Get SR as an int. */
- status = regcache->raw_read_unsigned (sr_base_regnum, &sr_value);
+ status = regcache->raw_read (sr_base_regnum, &sr_value);
if (status != REG_VALID)
return status;
/* Build the new value. */
@@ -1847,15 +1847,15 @@ sh64_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
fpscr_value = fpscr_c_value & fpscr_mask;
sr_value = (fpscr_value & sr_mask) >> 6;
- regcache->raw_read_unsigned (fpscr_base_regnum, &old_fpscr_value);
+ regcache->raw_read (fpscr_base_regnum, &old_fpscr_value);
old_fpscr_value &= 0xfffc0002;
fpscr_value |= old_fpscr_value;
- regcache->raw_write_unsigned (fpscr_base_regnum, fpscr_value);
+ regcache->raw_write (fpscr_base_regnum, fpscr_value);
- regcache->raw_read_unsigned (sr_base_regnum, &old_sr_value);
+ regcache->raw_read (sr_base_regnum, &old_sr_value);
old_sr_value &= 0xffff8fff;
sr_value |= old_sr_value;
- regcache->raw_write_unsigned (sr_base_regnum, sr_value);
+ regcache->raw_write (sr_base_regnum, sr_value);
}
else if (reg_nr == FPUL_C_REGNUM)
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