* infcall.c (call_function_by_hand): Handle language-specific
pass and return by reference. * cp-abi.c (cp_pass_by_reference): New. * cp-abi.h (cp_pass_by_reference): Declare. (struct cp_abi_ops): Add pass_by_reference. * gnu-v3-abi.c (gnuv3_pass_by_reference): New. (init_gnuv3_ops): Set pass_by_reference. * language.c (language_pass_by_reference): New. (default_pass_by_reference): New. (unknown_language_defn, auto_language_defn, local_language_defn): Add default_pass_by_reference. * langauge.h (struct language_defn): Add la_pass_by_reference. (language_pass_by_reference, default_pass_by_reference): Declare. * ada-lang.c (ada_language_defn): Add default_pass_by_reference. * c-lang.c (c_language_defn, asm_language_defn) (minimal_language_defn): Likewise. (cplus_language_defn): Add cp_pass_by_reference. * f-lang.c (f_language_defn): Add default_pass_by_reference. * jv-lang.c (java_language_defn): Likewise. * m2-lang.c (m2_language_defn): Likewise. * objc-lang.c (objc_language_defn): Likewise. * p-lang.c (pascal_language_defn): Likewise. * scm-lang.c (scm_language_defn): Likewise * gdb.cp/pass-by-ref.cc, gdb.cp/pass-by-ref.exp: New files.
This commit is contained in:
Daniel Jacobowitz
parent
3f213f78ed
commit
41f1b6975d
@ -1,3 +1,31 @@
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2007-09-23 Daniel Jacobowitz <dan@codesourcery.com>
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* infcall.c (call_function_by_hand): Handle language-specific
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pass and return by reference.
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* cp-abi.c (cp_pass_by_reference): New.
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* cp-abi.h (cp_pass_by_reference): Declare.
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(struct cp_abi_ops): Add pass_by_reference.
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* gnu-v3-abi.c (gnuv3_pass_by_reference): New.
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(init_gnuv3_ops): Set pass_by_reference.
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* language.c (language_pass_by_reference): New.
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(default_pass_by_reference): New.
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(unknown_language_defn, auto_language_defn, local_language_defn): Add
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default_pass_by_reference.
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* langauge.h (struct language_defn): Add la_pass_by_reference.
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(language_pass_by_reference, default_pass_by_reference): Declare.
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* ada-lang.c (ada_language_defn): Add default_pass_by_reference.
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* c-lang.c (c_language_defn, asm_language_defn)
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(minimal_language_defn): Likewise.
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(cplus_language_defn): Add cp_pass_by_reference.
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* f-lang.c (f_language_defn): Add default_pass_by_reference.
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* jv-lang.c (java_language_defn): Likewise.
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* m2-lang.c (m2_language_defn): Likewise.
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* objc-lang.c (objc_language_defn): Likewise.
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* p-lang.c (pascal_language_defn): Likewise.
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* scm-lang.c (scm_language_defn): Likewise
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2007-09-23 Vladimir Prus <vladimir@codesourcery.com>
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Allow a code breakpoint to have several locations
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@ -10441,6 +10441,7 @@ const struct language_defn ada_language_defn = {
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ada_get_gdb_completer_word_break_characters,
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ada_language_arch_info,
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ada_print_array_index,
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default_pass_by_reference,
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LANG_MAGIC
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};
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@ -606,6 +606,7 @@ const struct language_defn c_language_defn =
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default_word_break_characters,
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c_language_arch_info,
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default_print_array_index,
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default_pass_by_reference,
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LANG_MAGIC
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};
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@ -711,6 +712,7 @@ const struct language_defn cplus_language_defn =
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default_word_break_characters,
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cplus_language_arch_info,
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default_print_array_index,
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cp_pass_by_reference,
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LANG_MAGIC
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};
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@ -747,6 +749,7 @@ const struct language_defn asm_language_defn =
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default_word_break_characters,
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c_language_arch_info, /* FIXME: la_language_arch_info. */
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default_print_array_index,
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default_pass_by_reference,
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LANG_MAGIC
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};
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@ -788,6 +791,7 @@ const struct language_defn minimal_language_defn =
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default_word_break_characters,
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c_language_arch_info,
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default_print_array_index,
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default_pass_by_reference,
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LANG_MAGIC
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};
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@ -135,6 +135,14 @@ cplus_method_ptr_to_value (struct value **this_p, struct value *method_ptr)
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return (*current_cp_abi.method_ptr_to_value) (this_p, method_ptr);
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}
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int
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cp_pass_by_reference (struct type *type)
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{
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if ((current_cp_abi.pass_by_reference) == NULL)
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return 0;
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return (*current_cp_abi.pass_by_reference) (type);
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}
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/* Set the current C++ ABI to SHORT_NAME. */
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static int
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@ -172,6 +172,10 @@ void cplus_make_method_ptr (gdb_byte *CONTENTS, CORE_ADDR address,
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CORE_ADDR cplus_skip_trampoline (struct frame_info *frame, CORE_ADDR stop_pc);
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/* Return non-zero if an argument of type TYPE should be passed by reference
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instead of value. */
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extern int cp_pass_by_reference (struct type *type);
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struct cp_abi_ops
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{
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const char *shortname;
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@ -195,6 +199,7 @@ struct cp_abi_ops
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void (*make_method_ptr) (gdb_byte *, CORE_ADDR, int);
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struct value * (*method_ptr_to_value) (struct value **, struct value *);
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CORE_ADDR (*skip_trampoline) (struct frame_info *, CORE_ADDR);
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int (*pass_by_reference) (struct type *type);
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};
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@ -503,6 +503,7 @@ const struct language_defn f_language_defn =
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default_word_break_characters,
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f_language_arch_info,
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default_print_array_index,
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default_pass_by_reference,
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LANG_MAGIC
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};
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@ -716,6 +716,87 @@ gnuv3_skip_trampoline (struct frame_info *frame, CORE_ADDR stop_pc)
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return real_stop_pc;
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}
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/* Return nonzero if a type should be passed by reference.
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The rule in the v3 ABI document comes from section 3.1.1. If the
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type has a non-trivial copy constructor or destructor, then the
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caller must make a copy (by calling the copy constructor if there
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is one or perform the copy itself otherwise), pass the address of
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the copy, and then destroy the temporary (if necessary).
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For return values with non-trivial copy constructors or
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destructors, space will be allocated in the caller, and a pointer
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will be passed as the first argument (preceding "this").
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We don't have a bulletproof mechanism for determining whether a
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constructor or destructor is trivial. For GCC and DWARF2 debug
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information, we can check the artificial flag.
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We don't do anything with the constructors or destructors,
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but we have to get the argument passing right anyway. */
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static int
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gnuv3_pass_by_reference (struct type *type)
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{
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int fieldnum, fieldelem;
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CHECK_TYPEDEF (type);
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/* We're only interested in things that can have methods. */
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if (TYPE_CODE (type) != TYPE_CODE_STRUCT
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&& TYPE_CODE (type) != TYPE_CODE_CLASS
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&& TYPE_CODE (type) != TYPE_CODE_UNION)
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return 0;
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for (fieldnum = 0; fieldnum < TYPE_NFN_FIELDS (type); fieldnum++)
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for (fieldelem = 0; fieldelem < TYPE_FN_FIELDLIST_LENGTH (type, fieldnum);
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fieldelem++)
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{
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struct fn_field *fn = TYPE_FN_FIELDLIST1 (type, fieldnum);
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char *name = TYPE_FN_FIELDLIST_NAME (type, fieldnum);
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struct type *fieldtype = TYPE_FN_FIELD_TYPE (fn, fieldelem);
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/* If this function is marked as artificial, it is compiler-generated,
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and we assume it is trivial. */
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if (TYPE_FN_FIELD_ARTIFICIAL (fn, fieldelem))
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continue;
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/* If we've found a destructor, we must pass this by reference. */
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if (name[0] == '~')
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return 1;
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/* If the mangled name of this method doesn't indicate that it
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is a constructor, we're not interested.
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FIXME drow/2007-09-23: We could do this using the name of
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the method and the name of the class instead of dealing
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with the mangled name. We don't have a convenient function
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to strip off both leading scope qualifiers and trailing
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template arguments yet. */
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if (!is_constructor_name (TYPE_FN_FIELD_PHYSNAME (fn, fieldelem)))
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continue;
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/* If this method takes two arguments, and the second argument is
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a reference to this class, then it is a copy constructor. */
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if (TYPE_NFIELDS (fieldtype) == 2
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&& TYPE_CODE (TYPE_FIELD_TYPE (fieldtype, 1)) == TYPE_CODE_REF
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&& check_typedef (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (fieldtype, 1))) == type)
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return 1;
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}
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/* Even if all the constructors and destructors were artificial, one
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of them may have invoked a non-artificial constructor or
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destructor in a base class. If any base class needs to be passed
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by reference, so does this class. Similarly for members, which
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are constructed whenever this class is. We do not need to worry
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about recursive loops here, since we are only looking at members
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of complete class type. */
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for (fieldnum = 0; fieldnum < TYPE_NFIELDS (type); fieldnum++)
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if (gnuv3_pass_by_reference (TYPE_FIELD_TYPE (type, fieldnum)))
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return 1;
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return 0;
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}
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static void
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init_gnuv3_ops (void)
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{
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@ -738,6 +819,7 @@ init_gnuv3_ops (void)
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gnu_v3_abi_ops.make_method_ptr = gnuv3_make_method_ptr;
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gnu_v3_abi_ops.method_ptr_to_value = gnuv3_method_ptr_to_value;
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gnu_v3_abi_ops.skip_trampoline = gnuv3_skip_trampoline;
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gnu_v3_abi_ops.pass_by_reference = gnuv3_pass_by_reference;
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}
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extern initialize_file_ftype _initialize_gnu_v3_abi; /* -Wmissing-prototypes */
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@ -339,8 +339,8 @@ call_function_by_hand (struct value *function, int nargs, struct value **args)
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{
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CORE_ADDR sp;
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CORE_ADDR dummy_addr;
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struct type *values_type;
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unsigned char struct_return;
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struct type *values_type, *target_values_type;
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unsigned char struct_return = 0, lang_struct_return = 0;
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CORE_ADDR struct_addr = 0;
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struct regcache *retbuf;
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struct cleanup *retbuf_cleanup;
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@ -354,6 +354,7 @@ call_function_by_hand (struct value *function, int nargs, struct value **args)
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struct regcache *caller_regcache;
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struct cleanup *caller_regcache_cleanup;
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struct frame_id dummy_id;
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struct cleanup *args_cleanup;
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if (TYPE_CODE (ftype) == TYPE_CODE_PTR)
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ftype = check_typedef (TYPE_TARGET_TYPE (ftype));
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@ -460,10 +461,30 @@ call_function_by_hand (struct value *function, int nargs, struct value **args)
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using_gcc = (b == NULL ? 2 : BLOCK_GCC_COMPILED (b));
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}
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/* Are we returning a value using a structure return or a normal
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value return? */
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/* Are we returning a value using a structure return (passing a
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hidden argument pointing to storage) or a normal value return?
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There are two cases: language-mandated structure return and
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target ABI structure return. The variable STRUCT_RETURN only
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describes the latter. The language version is handled by passing
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the return location as the first parameter to the function,
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even preceding "this". This is different from the target
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ABI version, which is target-specific; for instance, on ia64
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the first argument is passed in out0 but the hidden structure
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return pointer would normally be passed in r8. */
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if (language_pass_by_reference (values_type))
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{
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lang_struct_return = 1;
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/* Tell the target specific argument pushing routine not to
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expect a value. */
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target_values_type = builtin_type_void;
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}
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else
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{
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struct_return = using_struct_return (values_type, using_gcc);
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target_values_type = values_type;
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}
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/* Determine the location of the breakpoint (and possibly other
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stuff) that the called function will return to. The SPARC, for a
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@ -482,7 +503,7 @@ call_function_by_hand (struct value *function, int nargs, struct value **args)
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if (gdbarch_inner_than (current_gdbarch, 1, 2))
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{
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sp = push_dummy_code (current_gdbarch, sp, funaddr,
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using_gcc, args, nargs, values_type,
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using_gcc, args, nargs, target_values_type,
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&real_pc, &bp_addr, get_current_regcache ());
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dummy_addr = sp;
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}
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@ -490,7 +511,7 @@ call_function_by_hand (struct value *function, int nargs, struct value **args)
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{
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dummy_addr = sp;
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sp = push_dummy_code (current_gdbarch, sp, funaddr,
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using_gcc, args, nargs, values_type,
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using_gcc, args, nargs, target_values_type,
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&real_pc, &bp_addr, get_current_regcache ());
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}
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break;
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@ -560,6 +581,9 @@ call_function_by_hand (struct value *function, int nargs, struct value **args)
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args[i] = value_arg_coerce (args[i], param_type, prototyped);
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if (param_type != NULL && language_pass_by_reference (param_type))
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args[i] = value_addr (args[i]);
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/* elz: this code is to handle the case in which the function
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to be called has a pointer to function as parameter and the
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corresponding actual argument is the address of a function
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@ -659,7 +683,7 @@ You must use a pointer to function type variable. Command ignored."), arg_name);
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stack, if necessary. Make certain that the value is correctly
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aligned. */
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if (struct_return)
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if (struct_return || lang_struct_return)
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{
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int len = TYPE_LENGTH (values_type);
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if (gdbarch_inner_than (current_gdbarch, 1, 2))
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@ -684,6 +708,22 @@ You must use a pointer to function type variable. Command ignored."), arg_name);
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}
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}
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if (lang_struct_return)
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{
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struct value **new_args;
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/* Add the new argument to the front of the argument list. */
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new_args = xmalloc (sizeof (struct value *) * (nargs + 1));
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new_args[0] = value_from_pointer (lookup_pointer_type (values_type),
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struct_addr);
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memcpy (&new_args[1], &args[0], sizeof (struct value *) * nargs);
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args = new_args;
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nargs++;
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args_cleanup = make_cleanup (xfree, args);
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}
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else
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args_cleanup = make_cleanup (null_cleanup, NULL);
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/* Create the dummy stack frame. Pass in the call dummy address as,
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presumably, the ABI code knows where, in the call dummy, the
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return address should be pointed. */
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@ -691,6 +731,8 @@ You must use a pointer to function type variable. Command ignored."), arg_name);
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get_current_regcache (), bp_addr, nargs, args,
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sp, struct_return, struct_addr);
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do_cleanups (args_cleanup);
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/* Set up a frame ID for the dummy frame so we can pass it to
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set_momentary_breakpoint. We need to give the breakpoint a frame
|
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ID so that the breakpoint code can correctly re-identify the
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@ -882,7 +924,9 @@ the function call)."), name);
|
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{
|
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struct value *retval = NULL;
|
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|
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if (TYPE_CODE (values_type) == TYPE_CODE_VOID)
|
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if (lang_struct_return)
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retval = value_at (values_type, struct_addr);
|
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else if (TYPE_CODE (target_values_type) == TYPE_CODE_VOID)
|
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{
|
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/* If the function returns void, don't bother fetching the
|
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return value. */
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@ -892,7 +936,7 @@ the function call)."), name);
|
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{
|
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struct gdbarch *arch = current_gdbarch;
|
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|
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switch (gdbarch_return_value (arch, values_type, NULL, NULL, NULL))
|
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switch (gdbarch_return_value (arch, target_values_type, NULL, NULL, NULL))
|
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{
|
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case RETURN_VALUE_REGISTER_CONVENTION:
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case RETURN_VALUE_ABI_RETURNS_ADDRESS:
|
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|
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@ -1115,6 +1115,7 @@ const struct language_defn java_language_defn =
|
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default_word_break_characters,
|
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c_language_arch_info,
|
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default_print_array_index,
|
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default_pass_by_reference,
|
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LANG_MAGIC
|
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};
|
||||
|
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|
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@ -1045,6 +1045,23 @@ language_class_name_from_physname (const struct language_defn *current_language,
|
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return NULL;
|
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}
|
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|
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/* Return non-zero if TYPE should be passed (and returned) by
|
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reference at the language level. */
|
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int
|
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language_pass_by_reference (struct type *type)
|
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{
|
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return current_language->la_pass_by_reference (type);
|
||||
}
|
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|
||||
/* Return zero; by default, types are passed by value at the language
|
||||
level. The target ABI may pass or return some structs by reference
|
||||
independent of this. */
|
||||
int
|
||||
default_pass_by_reference (struct type *type)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Return the default string containing the list of characters
|
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delimiting words. This is a reasonable default value that
|
||||
most languages should be able to use. */
|
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@ -1191,6 +1208,7 @@ const struct language_defn unknown_language_defn =
|
||||
default_word_break_characters,
|
||||
unknown_language_arch_info, /* la_language_arch_info. */
|
||||
default_print_array_index,
|
||||
default_pass_by_reference,
|
||||
LANG_MAGIC
|
||||
};
|
||||
|
||||
@ -1228,6 +1246,7 @@ const struct language_defn auto_language_defn =
|
||||
default_word_break_characters,
|
||||
unknown_language_arch_info, /* la_language_arch_info. */
|
||||
default_print_array_index,
|
||||
default_pass_by_reference,
|
||||
LANG_MAGIC
|
||||
};
|
||||
|
||||
@ -1264,6 +1283,7 @@ const struct language_defn local_language_defn =
|
||||
default_word_break_characters,
|
||||
unknown_language_arch_info, /* la_language_arch_info. */
|
||||
default_print_array_index,
|
||||
default_pass_by_reference,
|
||||
LANG_MAGIC
|
||||
};
|
||||
|
||||
|
||||
@ -280,6 +280,10 @@ struct language_defn
|
||||
int format,
|
||||
enum val_prettyprint pretty);
|
||||
|
||||
/* Return non-zero if TYPE should be passed (and returned) by
|
||||
reference at the language level. */
|
||||
int (*la_pass_by_reference) (struct type *type);
|
||||
|
||||
/* Add fields above this point, so the magic number is always last. */
|
||||
/* Magic number for compat checking */
|
||||
|
||||
@ -471,4 +475,13 @@ extern void default_print_array_index (struct value *index_value,
|
||||
int format,
|
||||
enum val_prettyprint pretty);
|
||||
|
||||
/* Return non-zero if TYPE should be passed (and returned) by
|
||||
reference at the language level. */
|
||||
int language_pass_by_reference (struct type *type);
|
||||
|
||||
/* Return zero; by default, types are passed by value at the language
|
||||
level. The target ABI may pass or return some structs by reference
|
||||
independent of this. */
|
||||
int default_pass_by_reference (struct type *type);
|
||||
|
||||
#endif /* defined (LANGUAGE_H) */
|
||||
|
||||
@ -459,6 +459,7 @@ const struct language_defn m2_language_defn =
|
||||
default_word_break_characters,
|
||||
m2_language_arch_info,
|
||||
default_print_array_index,
|
||||
default_pass_by_reference,
|
||||
LANG_MAGIC
|
||||
};
|
||||
|
||||
|
||||
@ -668,6 +668,7 @@ const struct language_defn objc_language_defn = {
|
||||
default_word_break_characters,
|
||||
c_language_arch_info,
|
||||
default_print_array_index,
|
||||
default_pass_by_reference,
|
||||
LANG_MAGIC
|
||||
};
|
||||
|
||||
|
||||
@ -525,6 +525,7 @@ const struct language_defn pascal_language_defn =
|
||||
default_word_break_characters,
|
||||
pascal_language_arch_info,
|
||||
default_print_array_index,
|
||||
default_pass_by_reference,
|
||||
LANG_MAGIC
|
||||
};
|
||||
|
||||
|
||||
@ -267,6 +267,7 @@ const struct language_defn scm_language_defn =
|
||||
default_word_break_characters,
|
||||
c_language_arch_info,
|
||||
default_print_array_index,
|
||||
default_pass_by_reference,
|
||||
LANG_MAGIC
|
||||
};
|
||||
|
||||
|
||||
@ -1,3 +1,7 @@
|
||||
2007-09-23 Daniel Jacobowitz <dan@codesourcery.com>
|
||||
|
||||
* gdb.cp/pass-by-ref.cc, gdb.cp/pass-by-ref.exp: New files.
|
||||
|
||||
2007-09-23 Pedro Alves <pedro_alves@portugalmail.pt>
|
||||
|
||||
* configure.ac: Do gdb.stabs tests by default on Cygwin and MinGW
|
||||
|
||||
79
gdb/testsuite/gdb.cp/pass-by-ref.cc
Normal file
79
gdb/testsuite/gdb.cp/pass-by-ref.cc
Normal file
@ -0,0 +1,79 @@
|
||||
/* This testcase is part of GDB, the GNU debugger.
|
||||
|
||||
Copyright 2007 Free Software Foundation, Inc.
|
||||
|
||||
This program is free software; you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation; either version 3 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
||||
|
||||
class Obj {
|
||||
public:
|
||||
Obj ();
|
||||
Obj (const Obj &);
|
||||
~Obj ();
|
||||
int var[2];
|
||||
};
|
||||
|
||||
int foo (Obj arg)
|
||||
{
|
||||
return arg.var[0] + arg.var[1];
|
||||
}
|
||||
|
||||
Obj::Obj ()
|
||||
{
|
||||
var[0] = 1;
|
||||
var[1] = 2;
|
||||
}
|
||||
|
||||
Obj::Obj (const Obj &obj)
|
||||
{
|
||||
var[0] = obj.var[0];
|
||||
var[1] = obj.var[1];
|
||||
}
|
||||
|
||||
Obj::~Obj ()
|
||||
{
|
||||
|
||||
}
|
||||
|
||||
struct Derived : public Obj
|
||||
{
|
||||
int other;
|
||||
};
|
||||
|
||||
int blap (Derived arg)
|
||||
{
|
||||
return foo (arg);
|
||||
}
|
||||
|
||||
struct Container
|
||||
{
|
||||
Obj obj;
|
||||
};
|
||||
|
||||
int blip (Container arg)
|
||||
{
|
||||
return foo (arg.obj);
|
||||
}
|
||||
|
||||
Obj global_obj;
|
||||
Derived global_derived;
|
||||
Container global_container;
|
||||
|
||||
int
|
||||
main ()
|
||||
{
|
||||
int bar = foo (global_obj);
|
||||
blap (global_derived);
|
||||
blip (global_container);
|
||||
return bar;
|
||||
}
|
||||
41
gdb/testsuite/gdb.cp/pass-by-ref.exp
Normal file
41
gdb/testsuite/gdb.cp/pass-by-ref.exp
Normal file
@ -0,0 +1,41 @@
|
||||
# Copyright 2007 Free Software Foundation, Inc.
|
||||
|
||||
# This program is free software; you can redistribute it and/or modify
|
||||
# it under the terms of the GNU General Public License as published by
|
||||
# the Free Software Foundation; either version 3 of the License, or
|
||||
# (at your option) any later version.
|
||||
#
|
||||
# This program is distributed in the hope that it will be useful,
|
||||
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
# GNU General Public License for more details.
|
||||
#
|
||||
# You should have received a copy of the GNU General Public License
|
||||
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
# Check that GDB can call C++ functions whose parameters have
|
||||
# object type, but are passed by reference.
|
||||
|
||||
if { [skip_cplus_tests] } { continue }
|
||||
|
||||
set testfile "pass-by-ref"
|
||||
set srcfile ${testfile}.cc
|
||||
set binfile ${objdir}/${subdir}/${testfile}
|
||||
if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" \
|
||||
executable {debug c++}] != "" } {
|
||||
untested pass-by-ref.exp
|
||||
return -1
|
||||
}
|
||||
|
||||
gdb_exit
|
||||
gdb_start
|
||||
gdb_reinitialize_dir $srcdir/$subdir
|
||||
gdb_load ${binfile}
|
||||
|
||||
if ![runto_main] then {
|
||||
return -1
|
||||
}
|
||||
|
||||
gdb_test "print foo (global_obj)" " = 3" "call function in obj"
|
||||
gdb_test "print blap (global_derived)" " = 3" "call function in derived"
|
||||
gdb_test "print blip (global_container)" " = 3" "call function in container"
|
||||
Loading…
Reference in New Issue
Block a user