Node:Label Output, Next:Initialization, Previous:Uninitialized Data, Up:Assembler Format
This is about outputting labels.
ASM_OUTPUT_LABEL (stream, name)
assemble_name (stream, name)
to
output the name itself; before and after that, output the additional
assembler syntax for defining the name, and a newline.
ASM_DECLARE_FUNCTION_NAME (stream, name, decl)
ASM_OUTPUT_LABEL
). The argument decl is the
FUNCTION_DECL
tree node representing the function.
If this macro is not defined, then the function name is defined in the
usual manner as a label (by means of ASM_OUTPUT_LABEL
).
ASM_DECLARE_FUNCTION_SIZE (stream, name, decl)
FUNCTION_DECL
tree node
representing the function.
If this macro is not defined, then the function size is not defined.
ASM_DECLARE_OBJECT_NAME (stream, name, decl)
ASM_OUTPUT_LABEL
). The argument
decl is the VAR_DECL
tree node representing the variable.
If this macro is not defined, then the variable name is defined in the
usual manner as a label (by means of ASM_OUTPUT_LABEL
).
ASM_DECLARE_REGISTER_GLOBAL (stream, decl, regno, name)
If you don't define this macro, that is equivalent to defining it to do
nothing.
ASM_FINISH_DECLARE_OBJECT (stream, decl, toplevel, atend)
If you don't define this macro, that is equivalent to defining it to do
nothing.
ASM_GLOBALIZE_LABEL (stream, name)
assemble_name (stream, name)
to output the name
itself; before and after that, output the additional assembler syntax
for making that name global, and a newline.
ASM_WEAKEN_LABEL
assemble_name (stream, name)
to output the name
itself; before and after that, output the additional assembler syntax
for making that name weak, and a newline.
If you don't define this macro, GCC will not support weak
symbols and you should not define the SUPPORTS_WEAK
macro.
SUPPORTS_WEAK
If you don't define this macro, defaults.h
provides a default
definition. If ASM_WEAKEN_LABEL
is defined, the default
definition is 1
; otherwise, it is 0
. Define this macro if
you want to control weak symbol support with a compiler flag such as
-melf
.
MAKE_DECL_ONE_ONLY
COMDAT
section flags in the Microsoft Windows PE/COFF format, and this support
requires changes to decl, such as putting it in a separate section.
SUPPORTS_ONE_ONLY
If you don't define this macro, varasm.c
provides a default
definition. If MAKE_DECL_ONE_ONLY
is defined, the default
definition is 1
; otherwise, it is 0
. Define this macro if
you want to control one-only symbol support with a compiler flag, or if
setting the DECL_ONE_ONLY
flag is enough to mark a declaration to
be emitted as one-only.
ASM_OUTPUT_EXTERNAL (stream, decl, name)
This macro need not be defined if it does not need to output anything.
The GNU assembler and most Unix assemblers don't require anything.
ASM_OUTPUT_EXTERNAL_LIBCALL (stream, symref)
rtx
and
is a symbol_ref
.
This macro need not be defined if it does not need to output anything.
The GNU assembler and most Unix assemblers don't require anything.
ASM_OUTPUT_LABELREF (stream, name)
_
to the front of the name, if that
is customary on your operating system, as it is in most Berkeley Unix
systems. This macro is used in assemble_name
.
ASM_OUTPUT_SYMBOL_REF (stream, sym)
SYMBOL_REF
sym. If not defined, assemble_name
will be used to output the name of the symbol. This macro may be used
to modify the way a symbol is referenced depending on information
encoded by ENCODE_SECTION_INFO
.
ASM_OUTPUT_LABEL_REF (stream, buf)
assemble_name
will be used to output the name of the symbol.
This macro is not used by output_asm_label
, or the %l
specifier that calls it; the intention is that this macro should be set
when it is necessary to output a label differently when its address
is being taken.
ASM_OUTPUT_INTERNAL_LABEL (stream, prefix, num)
It is absolutely essential that these labels be distinct from the labels used for user-level functions and variables. Otherwise, certain programs will have name conflicts with internal labels.
It is desirable to exclude internal labels from the symbol table of the
object file. Most assemblers have a naming convention for labels that
should be excluded; on many systems, the letter L
at the
beginning of a label has this effect. You should find out what
convention your system uses, and follow it.
The usual definition of this macro is as follows:
fprintf (stream, "L%s%d:\n", prefix, num)
ASM_OUTPUT_DEBUG_LABEL (stream, prefix, num)
If this macro is not defined, then ASM_OUTPUT_INTERNAL_LABEL
will be
used.
ASM_OUTPUT_ALTERNATE_LABEL_NAME (stream, string)
The default definition of this macro is as follows:
fprintf (stream, "%s:\n", LABEL_ALTERNATE_NAME (INSN))
ASM_GENERATE_INTERNAL_LABEL (string, prefix, num)
This string, when output subsequently by assemble_name
, should
produce the output that ASM_OUTPUT_INTERNAL_LABEL
would produce
with the same prefix and num.
If the string begins with *
, then assemble_name
will
output the rest of the string unchanged. It is often convenient for
ASM_GENERATE_INTERNAL_LABEL
to use *
in this way. If the
string doesn't start with *
, then ASM_OUTPUT_LABELREF
gets
to output the string, and may change it. (Of course,
ASM_OUTPUT_LABELREF
is also part of your machine description, so
you should know what it does on your machine.)
ASM_FORMAT_PRIVATE_NAME (outvar, name, number)
char *
) a newly allocated string made from the string
name and the number number, with some suitable punctuation
added. Use alloca
to get space for the string.
The string will be used as an argument to ASM_OUTPUT_LABELREF
to
produce an assembler label for an internal static variable whose name is
name. Therefore, the string must be such as to result in valid
assembler code. The argument number is different each time this
macro is executed; it prevents conflicts between similarly-named
internal static variables in different scopes.
Ideally this string should not be a valid C identifier, to prevent any
conflict with the user's own symbols. Most assemblers allow periods
or percent signs in assembler symbols; putting at least one of these
between the name and the number will suffice.
ASM_OUTPUT_DEF (stream, name, value)
If SET_ASM_OP
is defined, a default definition is provided which is
correct for most systems.
ASM_OUTPUT_DEF_FROM_DECLS (stream, decl_of_name, decl_of_value)
ASM_OUTPUT_DEF
if it is defined and if
the tree nodes are available.
ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL (stream, symbol, high, low)
If SET_ASM_OP
is defined, a default definition is provided which is
correct for most systems.
ASM_OUTPUT_WEAK_ALIAS (stream, name, value)
NULL
, it defines name as
an undefined weak symbol.
Define this macro if the target only supports weak aliases; define
ASM_OUTPUT_DEF
instead if possible.
OBJC_GEN_METHOD_LABEL (buf, is_inst, class_name, cat_name, sel_name)
The default name is a unique method number followed by the name of the
class (e.g. _1_Foo
). For methods in categories, the name of
the category is also included in the assembler name (e.g.
_1_Foo_Bar
).
These names are safe on most systems, but make debugging difficult since the method's selector is not present in the name. Therefore, particular systems define other ways of computing names.
buf is an expression of type char *
which gives you a
buffer in which to store the name; its length is as long as
class_name, cat_name and sel_name put together, plus
50 characters extra.
The argument is_inst specifies whether the method is an instance
method or a class method; class_name is the name of the class;
cat_name is the name of the category (or NULL
if the method is not
in a category); and sel_name is the name of the selector.
On systems where the assembler can handle quoted names, you can use this
macro to provide more human-readable names.
ASM_DECLARE_CLASS_REFERENCE (stream, name)
ASM_DECLARE_UNRESOLVED_REFERENCE (stream, name)