Imagelibrary/binutils-gdb
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STT_GNU_IFUNC reader implementation.
	* elfread.c: Include gdbtypes.h, value.h and infcall.h.
	(SYMBOL_GOT_PLT_SUFFIX, elf_rel_plt_read)
	(elf_objfile_gnu_ifunc_cache_data, struct elf_gnu_ifunc_cache)
	(elf_gnu_ifunc_cache_hash, elf_gnu_ifunc_cache_eq)
	(elf_gnu_ifunc_record_cache, elf_gnu_ifunc_resolve_by_cache)
	(elf_gnu_ifunc_resolve_by_got, elf_gnu_ifunc_resolve_name)
	(elf_gnu_ifunc_resolve_addr): New.
	(elf_symfile_read): Call elf_rel_plt_read.
	(elf_gnu_ifunc_fns): New.
	(_initialize_elfread): Initialize elf_objfile_gnu_ifunc_cache_data.
	Install elf_gnu_ifunc_fns.
	* infcall.c (find_function_return_type): New function.
	(find_function_addr): Resolve TYPE_GNU_IFUNC functions, if possible.
	* minsyms.c (stub_gnu_ifunc_resolve_addr)
	(stub_gnu_ifunc_resolve_name): New functions.
	(stub_gnu_ifunc_fns, gnu_ifunc_fns_p): New variables.
	* symtab.h (struct gnu_ifunc_fns, gnu_ifunc_resolve_addr)
	(gnu_ifunc_resolve_name, gnu_ifunc_fns_p): New.
This commit is contained in:
Jan Kratochvil
2011-03-28 20:26:24 +00:00
parent 300f8e104f
commit 07be84bf8f
5 changed files with 480 additions and 1 deletions
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29
gdb/infcall.c
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@@ -228,6 +228,21 @@ value_arg_coerce (struct gdbarch *gdbarch, struct value *arg,
return value_cast (type, arg);
}
/* Return the return type of a function with its first instruction exactly at
the PC address. Return NULL otherwise. */
static struct type *
find_function_return_type (CORE_ADDR pc)
{
struct symbol *sym = find_pc_function (pc);
if (sym != NULL && BLOCK_START (SYMBOL_BLOCK_VALUE (sym)) == pc
&& SYMBOL_TYPE (sym) != NULL)
return TYPE_TARGET_TYPE (SYMBOL_TYPE (sym));
return NULL;
}
/* Determine a function's address and its return type from its value.
Calls error() if the function is not valid for calling. */
@@ -257,7 +272,19 @@ find_function_addr (struct value *function, struct type **retval_type)
}
if (TYPE_CODE (ftype) == TYPE_CODE_FUNC
|| TYPE_CODE (ftype) == TYPE_CODE_METHOD)
value_type = TYPE_TARGET_TYPE (ftype);
{
value_type = TYPE_TARGET_TYPE (ftype);
if (TYPE_GNU_IFUNC (ftype))
{
funaddr = gnu_ifunc_resolve_addr (gdbarch, funaddr);
/* Skip querying the function symbol if no RETVAL_TYPE has been
asked for. */
if (retval_type)
value_type = find_function_return_type (funaddr);
}
}
else if (TYPE_CODE (ftype) == TYPE_CODE_INT)
{
/* Handle the case of functions lacking debugging info.