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gdb: use std::vector instead of alloca in core_target::get_core_register_section 

As I was trying to compile gdb for an m68k host, I got this error:

  CXX    corelow.o
In file included from /binutils-gdb/gdb/gdbsupport/common-defs.h:120,
                 from /binutils-gdb/gdb/defs.h:28,
                 from /binutils-gdb/gdb/corelow.c:20:
/binutils-gdb/gdb/corelow.c: In member function 'void core_target::get_core_register_section(regcache*, const regset*, const char*, int, int, const char*, bool)':
/binutils-gdb/gdb/../include/libiberty.h:727:36: error: 'alloca' bound is unknown [-Werror=alloca-larger-than=]
  727 | # define alloca(x) __builtin_alloca(x)
      |                    ~~~~~~~~~~~~~~~~^~~
/binutils-gdb/gdb/corelow.c:625:23: note: in expansion of macro 'alloca'
  625 |   contents = (char *) alloca (size);
      |                       ^~~~~~

We are using alloca to hold the contents of a the core register
sections.  These sections are typically fairly small, but there is no
realy guarantee, so I think it would be more reasonable to just use
dynamic allocation here.

gdb/ChangeLog:

	* corelow.c (core_target::get_core_register_section): Use
	  std::vector instead of alloca.
This commit is contained in:
Simon Marchi 2020-01-13 14:32:52 -05:00 committed by Simon Marchi
parent c0bd321d77
commit d8b2f9e333
2 changed files with 10 additions and 6 deletions
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5
gdb/ChangeLog
View File

@ -1,3 +1,8 @@
2020-01-13 Simon Marchi <simon.marchi@polymtl.ca>
* corelow.c (core_target::get_core_register_section): Use
std::vector instead of alloca.
2020-01-13 Simon Marchi <simon.marchi@efficios.com>
* warning.m4: Add -Wmissing-declarations to build_warnings.

11
gdb/corelow.c
View File

@ -594,7 +594,6 @@ core_target::get_core_register_section (struct regcache *regcache,
{
struct bfd_section *section;
bfd_size_type size;
char *contents;
bool variable_size_section = (regset != NULL
&& regset->flags & REGSET_VARIABLE_SIZE);
@ -622,9 +621,9 @@ core_target::get_core_register_section (struct regcache *regcache,
section_name.c_str ());
}
contents = (char *) alloca (size);
if (! bfd_get_section_contents (core_bfd, section, contents,
(file_ptr) 0, size))
std::vector<char> contents (size);
if (!bfd_get_section_contents (core_bfd, section, contents.data (),
(file_ptr) 0, size))
{
warning (_("Couldn't read %s registers from `%s' section in core file."),
human_name, section_name.c_str ());
@ -633,12 +632,12 @@ core_target::get_core_register_section (struct regcache *regcache,
if (regset != NULL)
{
regset->supply_regset (regset, regcache, -1, contents, size);
regset->supply_regset (regset, regcache, -1, contents.data (), size);
return;
}
gdb_assert (m_core_vec != nullptr);
m_core_vec->core_read_registers (regcache, contents, size, which,
m_core_vec->core_read_registers (regcache, contents.data (), size, which,
(CORE_ADDR) bfd_section_vma (section));
}