GNU Info
(gcc-300.info)File Framework
The Overall Framework of an Assembler File
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This describes the overall framework of an assembler file.
`ASM_FILE_START (STREAM)'
A C expression which outputs to the stdio stream STREAM some
appropriate text to go at the start of an assembler file.
Normally this macro is defined to output a line containing
`#NO_APP', which is a comment that has no effect on most
assemblers but tells the GNU assembler that it can save time by not
checking for certain assembler constructs.
On systems that use SDB, it is necessary to output certain
commands; see `attasm.h'.
`ASM_FILE_END (STREAM)'
A C expression which outputs to the stdio stream STREAM some
appropriate text to go at the end of an assembler file.
If this macro is not defined, the default is to output nothing
special at the end of the file. Most systems don't require any
definition.
On systems that use SDB, it is necessary to output certain
commands; see `attasm.h'.
`ASM_COMMENT_START'
A C string constant describing how to begin a comment in the target
assembler language. The compiler assumes that the comment will
end at the end of the line.
`ASM_APP_ON'
A C string constant for text to be output before each `asm'
statement or group of consecutive ones. Normally this is
`"#APP"', which is a comment that has no effect on most assemblers
but tells the GNU assembler that it must check the lines that
follow for all valid assembler constructs.
`ASM_APP_OFF'
A C string constant for text to be output after each `asm'
statement or group of consecutive ones. Normally this is
`"#NO_APP"', which tells the GNU assembler to resume making the
time-saving assumptions that are valid for ordinary compiler
output.
`ASM_OUTPUT_SOURCE_FILENAME (STREAM, NAME)'
A C statement to output COFF information or DWARF debugging
information which indicates that filename NAME is the current
source file to the stdio stream STREAM.
This macro need not be defined if the standard form of output for
the file format in use is appropriate.
`OUTPUT_QUOTED_STRING (STREAM, STRING)'
A C statement to output the string STRING to the stdio stream
STREAM. If you do not call the function `output_quoted_string' in
your config files, GCC will only call it to output filenames to
the assembler source. So you can use it to canonicalize the format
of the filename using this macro.
`ASM_OUTPUT_SOURCE_LINE (STREAM, LINE)'
A C statement to output DBX or SDB debugging information before
code for line number LINE of the current source file to the stdio
stream STREAM.
This macro need not be defined if the standard form of debugging
information for the debugger in use is appropriate.
`ASM_OUTPUT_IDENT (STREAM, STRING)'
A C statement to output something to the assembler file to handle a
`#ident' directive containing the text STRING. If this macro is
not defined, nothing is output for a `#ident' directive.
`ASM_OUTPUT_SECTION_NAME (STREAM, DECL, NAME, RELOC)'
A C statement to output something to the assembler file to switch
to section NAME for object DECL which is either a `FUNCTION_DECL',
a `VAR_DECL' or `NULL_TREE'. RELOC indicates whether the initial
value of EXP requires link-time relocations. The string given by
NAME will always be the canonical version stored in the global
stringpool.
Some target formats do not support arbitrary sections. Do not
define this macro in such cases.
At present this macro is only used to support section attributes.
When this macro is undefined, section attributes are disabled.
`OBJC_PROLOGUE'
A C statement to output any assembler statements which are
required to precede any Objective C object definitions or message
sending. The statement is executed only when compiling an
Objective C program.
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