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https://sourceware.org/git/binutils-gdb.git
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3debc0b348
We already have one overload of the startswith function that takes a std::string_view for both arguments. A later patch in this series is going to be improved by having an overload that takes one argument as a std::string_view and the other argument as a plain 'char *'. This commit adds the new overload, but doesn't make use of it (yet). There should be no user visible changes after this commit.
256 lines
8.1 KiB
C++
256 lines
8.1 KiB
C++
/* Shared general utility routines for GDB, the GNU debugger.
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Copyright (C) 1986-2024 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef COMMON_COMMON_UTILS_H
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#define COMMON_COMMON_UTILS_H
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#include <string>
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#include <vector>
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#include "gdbsupport/byte-vector.h"
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#include "gdbsupport/gdb_unique_ptr.h"
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#include "gdbsupport/array-view.h"
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#include "poison.h"
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#include <string_view>
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#if defined HAVE_LIBXXHASH
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# include <xxhash.h>
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#else
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# include "hashtab.h"
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#endif
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/* xmalloc(), xrealloc() and xcalloc() have already been declared in
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"libiberty.h". */
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/* Like xmalloc, but zero the memory. */
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void *xzalloc (size_t);
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/* Like asprintf and vasprintf, but return the string, throw an error
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if no memory. */
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gdb::unique_xmalloc_ptr<char> xstrprintf (const char *format, ...)
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ATTRIBUTE_PRINTF (1, 2);
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gdb::unique_xmalloc_ptr<char> xstrvprintf (const char *format, va_list ap)
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ATTRIBUTE_PRINTF (1, 0);
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/* Like snprintf, but throw an error if the output buffer is too small. */
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int xsnprintf (char *str, size_t size, const char *format, ...)
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ATTRIBUTE_PRINTF (3, 4);
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/* Returns a std::string built from a printf-style format string. */
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std::string string_printf (const char* fmt, ...)
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ATTRIBUTE_PRINTF (1, 2);
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/* Like string_printf, but takes a va_list. */
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std::string string_vprintf (const char* fmt, va_list args)
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ATTRIBUTE_PRINTF (1, 0);
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/* Like string_printf, but appends to DEST instead of returning a new
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std::string. */
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std::string &string_appendf (std::string &dest, const char* fmt, ...)
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ATTRIBUTE_PRINTF (2, 3);
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/* Like string_appendf, but takes a va_list. */
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std::string &string_vappendf (std::string &dest, const char* fmt, va_list args)
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ATTRIBUTE_PRINTF (2, 0);
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/* Make a copy of the string at PTR with LEN characters
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(and add a null character at the end in the copy).
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Uses malloc to get the space. Returns the address of the copy. */
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char *savestring (const char *ptr, size_t len);
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/* Extract the next word from ARG. The next word is defined as either,
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everything up to the next space, or, if the next word starts with either
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a single or double quote, then everything up to the closing quote. The
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enclosing quotes are not returned in the result string. The pointer in
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ARG is updated to point to the first character after the end of the
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word, or, for quoted words, the first character after the closing
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quote. */
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std::string extract_string_maybe_quoted (const char **arg);
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/* The strerror() function can return NULL for errno values that are
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out of range. Provide a "safe" version that always returns a
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printable string. This version is also thread-safe. */
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extern const char *safe_strerror (int);
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/* Version of startswith that takes string_view arguments. Return
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true if the start of STRING matches PATTERN, false otherwise. */
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static inline bool
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startswith (std::string_view string, std::string_view pattern)
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{
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return (string.length () >= pattern.length ()
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&& strncmp (string.data (), pattern.data (), pattern.length ()) == 0);
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}
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/* Version of startswith that takes a string_view for only one of its
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arguments. Return true if STR starts with PREFIX, otherwise return
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false. */
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static inline bool
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startswith (const char *str, const std::string_view &prefix)
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{
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return strncmp (str, prefix.data (), prefix.length ()) == 0;
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}
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/* Return true if the strings are equal. */
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static inline bool
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streq (const char *lhs, const char *rhs)
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{
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return strcmp (lhs, rhs) == 0;
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}
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/* Compare C strings for std::sort. */
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static inline bool
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compare_cstrings (const char *str1, const char *str2)
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{
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return strcmp (str1, str2) < 0;
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}
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ULONGEST strtoulst (const char *num, const char **trailer, int base);
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/* Skip leading whitespace characters in INP, returning an updated
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pointer. If INP is NULL, return NULL. */
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extern char *skip_spaces (char *inp);
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/* A const-correct version of the above. */
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extern const char *skip_spaces (const char *inp);
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/* Skip leading non-whitespace characters in INP, returning an updated
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pointer. If INP is NULL, return NULL. */
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extern char *skip_to_space (char *inp);
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/* A const-correct version of the above. */
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extern const char *skip_to_space (const char *inp);
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/* Assumes that V is an argv for a program, and iterates through
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freeing all the elements. */
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extern void free_vector_argv (std::vector<char *> &v);
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/* Return true if VALUE is in [LOW, HIGH]. */
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template <typename T>
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static bool
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in_inclusive_range (T value, T low, T high)
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{
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return value >= low && value <= high;
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}
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/* Ensure that V is aligned to an N byte boundary (N's assumed to be a
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power of 2). Round up/down when necessary. Examples of correct
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use include:
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addr = align_up (addr, 8); -- VALUE needs 8 byte alignment
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write_memory (addr, value, len);
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addr += len;
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and:
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sp = align_down (sp - len, 16); -- Keep SP 16 byte aligned
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write_memory (sp, value, len);
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Note that uses such as:
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write_memory (addr, value, len);
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addr += align_up (len, 8);
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and:
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sp -= align_up (len, 8);
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write_memory (sp, value, len);
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are typically not correct as they don't ensure that the address (SP
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or ADDR) is correctly aligned (relying on previous alignment to
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keep things right). This is also why the methods are called
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"align_..." instead of "round_..." as the latter reads better with
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this incorrect coding style. */
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extern ULONGEST align_up (ULONGEST v, int n);
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extern ULONGEST align_down (ULONGEST v, int n);
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/* Convert hex digit A to a number, or throw an exception. */
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extern int fromhex (int a);
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/* HEX is a string of characters representing hexadecimal digits.
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Convert pairs of hex digits to bytes and store sequentially into
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BIN. COUNT is the maximum number of characters to convert. This
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will convert fewer characters if the number of hex characters
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actually seen is odd, or if HEX terminates before COUNT characters.
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Returns the number of characters actually converted. */
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extern int hex2bin (const char *hex, gdb_byte *bin, int count);
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/* Like the above, but return a gdb::byte_vector. */
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gdb::byte_vector hex2bin (const char *hex);
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/* Build a string containing the contents of BYTES. Each byte is
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represented as a 2 character hex string, with spaces separating each
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individual byte. */
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extern std::string bytes_to_string (gdb::array_view<const gdb_byte> bytes);
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/* See bytes_to_string above. This takes a BUFFER pointer and LENGTH
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rather than an array view. */
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static inline std::string bytes_to_string (const gdb_byte *buffer,
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size_t length)
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{
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return bytes_to_string ({buffer, length});
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}
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/* A fast hashing function. This can be used to hash data in a fast way
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when the length is known. If no fast hashing library is available, falls
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back to iterative_hash from libiberty. START_VALUE can be set to
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continue hashing from a previous value. */
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static inline unsigned int
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fast_hash (const void *ptr, size_t len, unsigned int start_value = 0)
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{
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#if defined HAVE_LIBXXHASH
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return XXH64 (ptr, len, start_value);
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#else
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return iterative_hash (ptr, len, start_value);
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#endif
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}
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namespace gdb
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{
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/* Hash type for std::string_view.
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Even after we switch to C++17 and dump our string_view implementation, we
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might want to keep this hash implementation if it's faster than std::hash
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for std::string_view. */
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struct string_view_hash
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{
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std::size_t operator() (std::string_view view) const
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{ return fast_hash (view.data (), view.length ()); }
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};
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} /* namespace gdb */
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#endif /* COMMON_COMMON_UTILS_H */
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