[binutils-gdb] GDB: Switch to using C++ standard integer type limits

[binutils-gdb] GDB: Switch to using C++ standard integer type limits

[Maciej W. Rozycki]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=4a9efa5d63b2253a595ff9d6944415bf8cbfe408

commit 4a9efa5d63b2253a595ff9d6944415bf8cbfe408
Author: Maciej W. Rozycki <macro@embecosm.com>
Date:   Fri Feb 10 23:49:19 2023 +0000

    GDB: Switch to using C++ standard integer type limits
    
    Use <climits> instead of <limits.h> and ditch local fallback definitions
    for minimum and maximum value macros provided by C++11.  Add LONGEST_MAX
    and LONGEST_MIN definitions.
    
    Approved-By: Tom Tromey <tom@tromey.com>

Diff:
---
 gdb/defs.h                | 33 +--------------------------------
 gdb/gnu-nat.c             |  1 -
 gdbsupport/common-types.h |  8 +++++++-
 3 files changed, 8 insertions(+), 34 deletions(-)

diff --git a/gdb/defs.h b/gdb/defs.h
index b6a132173fb..f4fba9acf30 100644
--- a/gdb/defs.h
+++ b/gdb/defs.h
@@ -37,7 +37,7 @@
 #include "bfd.h"
 
 #include <sys/types.h>
-#include <limits.h>
+#include <climits>
 
 /* The libdecnumber library, on which GDB depends, includes a header file
    called gstdint.h instead of relying directly on stdint.h.  GDB, on the
@@ -446,37 +446,6 @@ enum val_prettyformat
 # include "fopen-bin.h"
 #endif
 
-/* Defaults for system-wide constants (if not defined by xm.h, we fake it).
-   FIXME: Assumes 2's complement arithmetic.  */
-
-#if !defined (UINT_MAX)
-#define	UINT_MAX ((unsigned int)(~0))	    /* 0xFFFFFFFF for 32-bits */
-#endif
-
-#if !defined (INT_MAX)
-#define	INT_MAX ((int)(UINT_MAX >> 1))	    /* 0x7FFFFFFF for 32-bits */
-#endif
-
-#if !defined (INT_MIN)
-#define INT_MIN ((int)((int) ~0 ^ INT_MAX)) /* 0x80000000 for 32-bits */
-#endif
-
-#if !defined (ULONG_MAX)
-#define	ULONG_MAX ((unsigned long)(~0L))    /* 0xFFFFFFFF for 32-bits */
-#endif
-
-#if !defined (LONG_MAX)
-#define	LONG_MAX ((long)(ULONG_MAX >> 1))   /* 0x7FFFFFFF for 32-bits */
-#endif
-
-#if !defined (ULONGEST_MAX)
-#define	ULONGEST_MAX (~(ULONGEST)0)        /* 0xFFFFFFFFFFFFFFFF for 64-bits */
-#endif
-
-#if !defined (LONGEST_MAX)                 /* 0x7FFFFFFFFFFFFFFF for 64-bits */
-#define	LONGEST_MAX ((LONGEST)(ULONGEST_MAX >> 1))
-#endif
-
 /* * Convert a LONGEST to an int.  This is used in contexts (e.g. number of
    arguments to a function, number in a value history, register number, etc.)
    where the value must not be larger than can fit in an int.  */
diff --git a/gdb/gnu-nat.c b/gdb/gnu-nat.c
index 004cacc8180..afaec46e3c1 100644
--- a/gdb/gnu-nat.c
+++ b/gdb/gnu-nat.c
@@ -52,7 +52,6 @@ extern "C"
 #include "defs.h"
 
 #include <ctype.h>
-#include <limits.h>
 #include <setjmp.h>
 #include <signal.h>
 #include <sys/ptrace.h>
diff --git a/gdbsupport/common-types.h b/gdbsupport/common-types.h
index e863d6505ea..4156021abb4 100644
--- a/gdbsupport/common-types.h
+++ b/gdbsupport/common-types.h
@@ -36,9 +36,15 @@ typedef uint64_t ULONGEST;
 /* * The largest CORE_ADDR value.  */
 #define CORE_ADDR_MAX (~(CORE_ADDR) 0)
 
-/* * The largest ULONGEST value.  */
+/* * The largest ULONGEST value, 0xFFFFFFFFFFFFFFFF for 64-bits.  */
 #define ULONGEST_MAX (~(ULONGEST) 0)
 
+/* * The largest LONGEST value, 0x7FFFFFFFFFFFFFFF for 64-bits.  */
+#define LONGEST_MAX ((LONGEST) (ULONGEST_MAX >> 1))
+
+/* * The smallest LONGEST value, 0x8000000000000000 for 64-bits.  */
+#define LONGEST_MIN ((LONGEST) (~(LONGEST) 0 ^ LONGEST_MAX))
+
 enum tribool { TRIBOOL_UNKNOWN = -1, TRIBOOL_FALSE = 0, TRIBOOL_TRUE = 1 };
 
 #endif /* COMMON_COMMON_TYPES_H */