GDB's language support is mainly driven by the symbol reader, although it is possible for the user to set the source language manually.
ºñ·Ï »ç¿ëÀÚ°¡ ¼Ò½º ¾ð¾î¸¦ ¼³Á¤Çϴ°ÍÀÌ °¡´ÉÇÏ´Ù ÇÒÁö¶óµµ, GDBÀÇ ¾ð¾î Áö¿øÀº ½Éº¼ ¸®´õ¿¡¼ ÆÄ»ýµÇ¾ú´Ù.
GDB chooses the source language by looking at the extension of the file recorded in the debug info; `.c' means C, `.f' means Fortran, etc. It may also use a special-purpose language identifier if the debug format supports it, like with DWARF.
GDB´Â µð¹ö±ë info¿¡ ±â·ÏµÈ ÆÄÀÏÀÇ È®ÀåÀÚ¸¦ ã¾Æ ¼Ò½º ¾ð¾î¸¦ ¼±ÅÃÇÑ´Ù.; `.c'´Â C¸¦ ÀǹÌÇϸç, `.f'´Â FortranÀ» ÀǹÌÇÑ´Ù. ¸¸ÀÏ µð¹ö±ë Çü½ÄÀÌ DWARF °°Àº °ÍÀ» Áö¿ø ÇÑ´Ù¸é, Ưº°ÇÑ ¸ñÀûÀÇ ¾ð¾î ½Äº°ÀÚ¸¦ »ç¿ëÇÒ¼ö ÀÖ´Ù.
To add other languages to GDB's expression parser, follow the following steps:
´Ù¸¥ ¾ð¾î¸¦ GDB Ç¥Çö½Ä Æļ(expression parser)¿¡ Ãß°¡½ÃÅ°±â À§ÇØ, ´ÙÀ½ ´Ü°è¸¦ µû¶óÇضó:
union exp_element
list are in
`parse.c'.
Since we can't depend upon everyone having Bison, and YACC produces
parsers that define a bunch of global names, the following lines
must be included at the top of the YACC parser, to prevent the
various parsers from defining the same global names:
¿ì¸®´Â BisonÀÌ °¡Áö°í ÀÖ´Â ¸ðµç°ÍÀ» »ç¿ëÇÏÁö ¾ÊÀ¸¸ç, YACCÀº Àü¿ª À̸§(global name)À» Á¤ÀÇÇÑ Æļ¸¦ ¸¸µé±â ¶§¹®¿¡, ´ÙÀ½ ¶óÀεéÀº ´Ù¾çÇÑ parser°¡ °°Àº Àü¿ª À̸§À» Á¤ÀÇÇÏÁö ¸øÇϵµ·Ï Çϱâ À§ÇØ YACC parserÀÇ ¸ÇÀ§¿¡ Æ÷ÇÔÇØ¾ß ÇÑ´Ù.
#define yyparse lang_parse #define yylex lang_lex #define yyerror lang_error #define yylval lang_lval #define yychar lang_char #define yydebug lang_debug #define yypact lang_pact #define yyr1 lang_r1 #define yyr2 lang_r2 #define yydef lang_def #define yychk lang_chk #define yypgo lang_pgo #define yyact lang_act #define yyexca lang_exca #define yyerrflag lang_errflag #define yynerrs lang_nerrsAt the bottom of your parser, define a
struct language_defn
and
initialize it with the right values for your language. Define an
initialize_lang
routine and have it call
`add_language(lang_language_defn)' to tell the rest of GDB
that your language exists. You'll need some other supporting variables
and functions, which will be used via pointers from your
lang_language_defn
. See the declaration of struct
language_defn
in `language.h', and the other `*-exp.y' files,
for more information.
ÆļÀÇ ¹Ø¿¡, struct language_defn
¸¦ Á¤ÀÇÇÏ°í ¾ð¾îÀÇ Àû´çÇÑ °ªÀ¸·Î ÃʱâÈ
Çضó. initialize_lang
·çƾÀ» Á¤ÀÇÇÏ°í ¾ð¾î°¡ Á¸ÀçÇѴٴ°ÍÀ»
GDB¿¡°Ô ¾Ë¸®±â À§ÇØ `add_language(lang_language_defn)'À» È£Ãâ
ÇÑ´Ù. ¿©·¯ºÐÀº ´Ù¸¥ Áö¿ø º¯¼ö¿Í ÇÔ¼ö°¡ ÇÊ¿äÇϸç ÀÌ°ÍÀº lang_language_defn
¿¡¼ Æ÷ÀÎÅ͸¦ ÅëÇØ »ç¿ëµÈ´Ù. `language.h'¿¡ Á¤ÀÇµÈ struct
language_defn
¼±¾ðÀ» º¸°í, ´õ ¸¹Àº Á¤º¸¸¦ À§ÇØ ´Ù¸¥ `*-exp.y' ÆÄÀϵ鵵
ÂüÁ¶Çضó.
evaluate_subexp
function
defined in the file `eval.c'. Add cases
for new opcodes in two functions from `parse.c':
prefixify_subexp
and length_of_subexp
. These compute
the number of exp_element
s that a given operation takes up.
¸¸ÀÏ »õ·Î¿î opcode(¾ð¾îÀÇ ÀÛµ¿À» ³ªÅ¸³»´Â)°¡ ÇÊ¿äÇÏ´Ù¸é, À̰͵éÀ» `expression.h'
¿¡ ³ª¿µÇ¾î Àִ ŸÀÔ¿¡ Ãß°¡Çضó. `eval.c' ÆÄÀÏ¿¡ Á¤ÀÇµÈ evaluate_subexp
ÇÔ¼ö¿¡ ÀÌ ÀÛµ¿µéÀ» À§ÇÑ Áö¿ø Äڵ带 Ãß°¡Çضó. »õ opcode¸¦ À§ÇÑ °æ¿ìµéÀ» `parse.c' ÀÇ µÎ ÇÔ¼ö¿¡ Ãß°¡Çضó:prefixify_subexp
¿Í length_of_subexp
.
À̰͵éÀº ÁÖ¾îÁø ÀÛµ¿ÀÌ ÀϾ´Â exp_element
ÀÇ ¼ö¸¦ °è»êÇÑ´Ù.
enum language
in `defs.h'.
Update the routines in `language.c' so your language is included.
These routines include type predicates and such, which (in some cases)
are language dependent. If your language does not appear in the switch
statement, an error is reported.
Also included in `language.c' is the code that updates the variable
current_language
, and the routines that translate the
language_lang
enumerated identifier into a printable
string.
Update the function _initialize_language
to include your
language. This function picks the default language upon startup, so is
dependent upon which languages that GDB is built for.
Update allocate_symtab
in `symfile.c' and/or symbol-reading
code so that the language of each symtab (source file) is set properly.
This is used to determine the language to use at each stack frame level.
Currently, the language is set based upon the extension of the source
file. If the language can be better inferred from the symbol
information, please set the language of the symtab in the symbol-reading
code.
Add helper code to print_subexp
(in `expprint.c') to handle any new
expression opcodes you have added to `expression.h'. Also, add the
printed representations of your operators to op_print_tab
.
¾ð¾î¸¦ À§ÇØ ³ª¿µÈ ½Äº°ÀÚ¸¦ `defs.h'¿¡ ³ª¿µÈ ŸÀÔ enum language
¿¡
Ãß°¡Çضó.
¿©·¯ºÐÀÇ ¾ð¾î°¡ Æ÷ÇÔµÈ `language.c'³» ·çƾÀ» °»½ÅÇÑ´Ù.
ÀÌµé ·çƾÀ» ŸÀÔ ¼ú¾î¸¦ Æ÷ÇÔÇϸç ÀÌ°ÍÀº(¸î¸î °æ¿ì¿¡) ¾ð¾î ÀÇÁ¸ÀûÀÌ´Ù.
¸¸ÀÏ ¾ð¾î°¡ switch ¹®ÀÚ¿¡ ³ªÅ¸³ªÁö ¾Ê´Â´Ù¸é, ¿¡·¯°¡ º¸°íµÈ´Ù.
`language.c'¿¡ Æ÷ÇÔµÈ °ÍÀº º¯¼ö current_language
¸¦ °»½ÅÇϱâ À§ÇÑ
ÄÚµå¿Í language_lang
³ª¿µÈ ½Äº°ÀÚ¸¦ Ãâ·Â °¡´ÉÇÑ ¹®ÀÚ¿·Î
¹ø¿ªÇÏ´Â ·çƾÀÌ´Ù.
¾ð¾î¸¦ Æ÷ÇÔÇϱâ À§ÇØ ÇÔ¼ö _initialize_language
¸¦ °»½ÅÇÑ´Ù. ÀÌ ÇÔ¼ö´Â
½ÃÀ۽à ±âº» ¾ð¾î¸¦ ¼±ÅÃÇϸç, ±×·¡¼ GDB°¡ ¾î¶² ¾ð¾î·Î Á¦À۵Ǿú´À³Ä¿¡ ÀÇÁ¸ÇÑ´Ù.
°¢ symtab(source file) ¾ð¾î¸¦ Àû´çÈ÷ ¼³Á¤Çϱâ À§Çؼ `symfile.c'³» allocate_symtab
¿Í ½Éº¼-ÀÐÀº Äڵ带 °»½ÅÇضó.
ÀÌ°ÍÀº °¢ ½ºÅà ÇÁ·¹ÀÓ ·¹º§¿¡¼ »ç¿ëÇϱâ À§ÇÑ ¾ð¾î¸¦ ¼±ÅÃÇϱâ À§ÇØ »ç¿ëµÈ´Ù.
ÇöÀç, ¾ð¾î´Â ¼Ò½º ÆÄÀÏÀÇ È®Àå¿¡ ±â¹ÝÇÑ´Ù. ¸¸ÀÏ ¾ð¾î°¡ ½Éº¼ Á¤º¸¿¡¼ Ãß·ÐÇϱ⠴õ ÁÁÀ»¼ö
ÀÖ´Ù¸é, ½Éº¼-ÀÐÀº Äڵ峻 symtabÀÇ ¾ð¾î¸¦ ¼³Á¤Çضó.
lang_parse()
and lang_error
in parse_exp_1
(defined in `parse.c').
parse_exp_1
(`parse.c'¿¡ Á¤ÀǵÈ)¿¡ lang_parse()
¿Í lang_error
¸¦ Ãß°¡Çضó.
_LANG_lang
defined in it. Use #ifdef
s to
leave out large routines that the user won't need if he or she is not
using your language.
Note that you do not need to do this in your YACC parser, since if GDB
is not build for lang, then `lang-exp.tab.o' (the
compiled form of your parser) is not linked into GDB at all.
See the file `configure.in' for how GDB is configured
for different languages.
»ç¿ëÀÚ´Â ÀϺγª ¸ðµç ¾ð¾î¸¦ À§ÇØ GDB ºôµå½Ã ¿É¼ÇÀ» °¡Áø´Ù.
¸¸ÀÏ »ç¿ëÀÚ°¡ ¾ð¾î lang¸¦ À§Çϵµ·Ï GDB¸¦ ºôµåÇϱâ·Î °áÁ¤ÇÑ´Ù¸é, `language.h'¿¡ ÀÇÁ¸ÇÏ´Â ¸ðµç ÆÄÀÏÀº ¿©±â¿¡ Á¤ÀÇµÈ ¸ÅÅ©·Î _LANG_lang
¸¦
°¡Áú °ÍÀÌ´Ù.
¸¸ÀÏ ¿©·¯ºÐÀÇ ¾ð¾î¸¦ »ç¿ëÇÏÁö ¾Ê´Â´Ù¸é »ç¿ëÀÚ´Â ÇÊ¿ä ¾ø´Â Ä¿´Ù¶õ ·çƾÀ» ºüÁ® ³ª°¡±â À§ÇØ
#ifdef
¸¦ »ç¿ëÇضó.
YACC Æļ¿¡¼ ÀÌ°ÍÀ» ÇÒ ÇÊ¿ä°¡ ¾ø´Ù´ÂÁ¡¿¡ ÁÖÀÇÇضó. ¿Ö³ÄÇÏ¸é ¸¸ÀÏ GDB°¡ lang¸¦
ºôµåÇÏÁö ¾Ê¾Ò´Ù¸é, `lang-exp.tab.o'(ÆļÀÇ ÄÄÆÄÀÏµÈ ÇüÅÂ)´Â GDB¿Í ¸µÅ©µÇÁö ¾Ê´Â´Ù.
HFILES
and OBJS
, otherwise your code may
not get linked in, or, worse yet, it may not get tar
red into the
distribution!
kefile.in'³» ÀÇÁ¸¼ºÀ» Ãß°¡ÇÑ´Ù. HFILES
¿Í OBJS
°°Àº
¸ÅÅ©·Î º¯¼ö¸¦ È®½ÇÈ÷ °»½ÅÇϵµ·Ï Çضó. ±×·¸Áö ¾ÊÀ¸¸é ÄÚµå´Â ¸µÅ©µÇÁö ¾Ê°Å³ª À߸ø µÇ¾î
¹èÆ÷½Ã tar
¸¦ °¡Áú¼ö ¾øÀ»Áö ¸ð¸¥´Ù.
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