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Diffstat (limited to 'gdb')
| -rw-r--r-- | gdb/doc/stabs.texinfo | 351 |
1 files changed, 224 insertions, 127 deletions
diff --git a/gdb/doc/stabs.texinfo b/gdb/doc/stabs.texinfo index 04ed787..02a43a9 100644 --- a/gdb/doc/stabs.texinfo +++ b/gdb/doc/stabs.texinfo @@ -77,10 +77,9 @@ This document describes the GNU stabs debugging format in a.out files. Appendixes: * Example2.c:: Source code for extended example * Example2.s:: Assembly code for extended example -* Stab types:: Table A: Symbol types from stabs -* Assembler types:: Table B: Symbol types from assembler and linker -* Symbol Descriptors:: Table C -* Type Descriptors:: Table D +* Stab Types:: Symbol types in a.out files +* Symbol Descriptors:: Table of Symbol Descriptors +* Type Descriptors:: Table of Symbol Descriptors * Expanded reference:: Reference information by stab type * Questions:: Questions and anomolies * xcoff-differences:: Differences between GNU stabs in a.out @@ -184,12 +183,8 @@ type of stab this is (or whether it @emph{is} a stab, as opposed to an ordinary symbol). Each possible type number defines a different stab type. The stab type further defines the exact interpretation of, and possible values for, any remaining @code{"@var{string}"}, @var{desc}, or -@var{value} fields present in the stab. Table A (@pxref{Stab -types,,Table A: Symbol types from stabs}) lists in numeric order the -possible type field values for stab directives. The reference section -that follows Table A describes the meaning of the fields for each stab -type in detail. The examples that follow this overview introduce the -stab types in terms of the source code elements they describe. +@var{value} fields present in the stab. @xref{Stab Types}, for a list +in numeric order of the possible type field values for stab directives. For @code{.stabs} the @code{"@var{string}"} field holds the meat of the debugging information. The generally unstructured nature of this field @@ -1150,7 +1145,7 @@ type definitions. Type 21 is pointer to type 2 (char) and argv (type 20) is pointer to type 21. @node Types -@chapter Type definitions +@chapter Type Definitions Now let's look at some variable definitions involving complex types. This involves understanding better how types are described. In the @@ -1313,10 +1308,11 @@ IEEE 64-bit (double precision) floating point format. @item 3 (NF_COMPLEX) @item 4 (NF_COMPLEX16) @item 5 (NF_COMPLEX32) -These are for complex numbers. A comment in -@file{include/aout/stab_gnu.h} describes them as Fortran complex, double -complex, and complex*16, respectively, but what does that mean? (i.e. -Single precision? Double precison?). +@c "GDB source" really means @file{include/aout/stab_gnu.h}, but trying +@c to put that here got an overfull hbox. +These are for complex numbers. A comment in the GDB source describes +them as Fortran complex, double complex, and complex*16, respectively, +but what does that mean? (i.e. Single precision? Double precison?). @item 6 (NF_LDOUBLE) Long double. It would be cleaner to define a different code for every @@ -1611,14 +1607,13 @@ through version 4.9) doesn't support any kind of index type other than a range anyway; I'm not sure about dbx. It is well established, and widely used, that the type of the index, -unlike most types found in the stabs, is merely a type definition -(@pxref{Type Definitions}), not type information (@pxref{Stabs Format}) -(that is, it need not start with @var{type-number}@code{=} if it is -defining a new type). According to a comment in GDB, this is also true -of the type of the array elements; it gives @samp{ar1;1;10;ar1;1;10;4} -as a legitimate way to express a two dimensional array. According to -AIX documentation, the element type must be type information. GDB -accepts either. +unlike most types found in the stabs, is merely a type definition, not +type information (@pxref{Stabs Format}) (that is, it need not start with +@var{type-number}@code{=} if it is defining a new type). According to a +comment in GDB, this is also true of the type of the array elements; it +gives @samp{ar1;1;10;ar1;1;10;4} as a legitimate way to express a two +dimensional array. According to AIX documentation, the element type +must be type information. GDB accepts either. The type of the index is often a range type, expressed as the letter r and some parameters. It defines the size of the array. In the example @@ -2530,8 +2525,10 @@ class. This is preceeded by `~%' and followed by a final semi-colon. N_LSYM,NIL,NIL,NIL @end display +@c FIXME: bogus line break. @example -.stabs "A:t20=s8Adat:1,0,32;$vf20:21=*22=ar1;0;1;17,32;A_virt::23=##1;:i;2A*-2147483647;20;;;~%20;",128,0,0,0 +.stabs "A:t20=s8Adat:1,0,32;$vf20:21=*22=ar1;0;1;17,32; + A_virt::23=##1;:i;2A*-2147483647;20;;;~%20;",128,0,0,0 @end example @node Inheritence @@ -2890,104 +2887,211 @@ description in the class stab shows this ordering. 137 .common _g_an_s,20,"bss" @end example -@node Stab types -@appendix Table A: Symbol types from stabs +@node Stab Types +@appendix Values for the Stab Type Field -Table A lists stab types sorted by type number. Stab type numbers are -32 and greater. This is the full list of stab numbers, including stab -types that are used in languages other than C. +These are all the possible values for the stab type field, for +@code{a.out} files. This does not apply to XCOFF. -The #define names for these stab types are defined in: -devo/include/aout/stab.def +The following types are used by the linker and assembler; there is +nothing stabs-specific about them. Since this document does not attempt +to describe aspects of object file format other than the debugging +format, no details are given. -@smallexample -type type #define used to describe -dec hex name source program feature ------------------------------------------------- -32 0x20 N_GYSM global symbol -34 0X22 N_FNAME function name (for BSD Fortran) -36 0x24 N_FUN function name or text segment variable for C -38 0x26 N_STSYM static symbol (data segment w/internal linkage) -40 0x28 N_LCSYM .lcomm symbol(BSS-seg variable w/internal linkage) -42 0x2a N_MAIN Name of main routine (not used in C) -48 0x30 N_PC global symbol (for Pascal) -50 0x32 N_NSYMS number of symbols (according to Ultrix V4.0) -52 0x34 N_NOMAP no DST map for sym (according to Ultrix V4.0) -64 0x40 N_RSYM register variable -66 0x42 N_M2C Modula-2 compilation unit -68 0x44 N_SLINE line number in text segment -70 0x46 N_DSLINE line number in data segment - -72 0x48 N_BSLINE line number in bss segment -72 0x48 N_BROWS Sun source code browser, path to .cb file - -74 0x4a N_DEFD GNU Modula2 definition module dependency - -80 0x50 N_EHDECL GNU C++ exception variable -80 0x50 N_MOD2 Modula2 info "for imc" (according to Ultrix V4.0) - -84 0x54 N_CATCH GNU C++ "catch" clause -96 0x60 N_SSYM structure of union element -100 0x64 N_SO path and name of source file -128 0x80 N_LSYM automatic var in the stack - (also used for type desc.) -130 0x82 N_BINCL beginning of an include file (Sun only) -132 0x84 N_SOL Name of sub-source (#include) file. -160 0xa0 N_PSYM parameter variable -162 0xa2 N_EINCL end of an include file -164 0xa4 N_ENTRY alternate entry point -192 0xc0 N_LBRAC beginning of a lexical block -194 0xc2 N_EXCL place holder for a deleted include file -196 0xc4 N_SCOPE modula2 scope information (Sun linker) -224 0xe0 N_RBRAC end of a lexical block -226 0xe2 N_BCOMM begin named common block -228 0xe4 N_ECOMM end named common block -232 0xe8 N_ECOML end common (local name) - - << used on Gould systems for non-base registers syms >> -240 0xf0 N_NBTEXT ?? -242 0xf2 N_NBDATA ?? -244 0xf4 N_NBBSS ?? -246 0xf6 N_NBSTS ?? -248 0xf8 N_NBLCS ?? -@end smallexample +@c Try to get most of these to fit on a single line. +@iftex +@tableindent=1.5in +@end iftex -@node Assembler types -@appendix Table B: Symbol types from assembler and linker +@table @code +@item 0x0 N_UNDF +Undefined symbol -Table B shows the types of symbol table entries that hold assembler -and linker symbols. Since this document does not attempt to describe -aspects of object file format other than the debugging format, no -details are given. +@item 0x2 N_ABS +File scope absolute symbol -@smallexample -hex symbolic -n_type name used to describe ----------------------------------- -0x0 N_UNDF undefined symbol -0x2 N_ABS file scope absolute symbol -0x3 N_ABS | N_EXT external absolute symbol -0x4 N_TEXT file scope text symbol -0x5 N_TEXT | N_EXT external text symbol -0x6 N_DATA file scope data symbol -0x7 N_DATA | N_EXT external data symbol -0x8 N_BSS file scope BSS symbol -0x9 N_BSS | N_EXT external BSS symbol - -0x0c N_FN_SEQ Same as N_FN, for Sequent compilers -0x0a N_INDR Symbol is indirected to another symbol -0x12 N_COMM common sym -- visable after shared lib dynamic link -0x14 N_SETA Absolute set element -0x16 N_SETT Text segment set element -0x18 N_SETD Data segment set element -0x1a N_SETB BSS segment set element -0x1c N_SETV Pointer to set vector -0x1e N_WARNING Print a warning message during linking -0x1f N_FN file name of a .o file -@end smallexample +@item 0x3 N_ABS | N_EXT +External absolute symbol + +@item 0x4 N_TEXT +File scope text symbol + +@item 0x5 N_TEXT | N_EXT +External text symbol + +@item 0x6 N_DATA +File scope data symbol + +@item 0x7 N_DATA | N_EXT +External data symbol + +@item 0x8 N_BSS +File scope BSS symbol + +@item 0x9 N_BSS | N_EXT +External BSS symbol + +@item 0x0c N_FN_SEQ +Same as N_FN, for Sequent compilers + +@item 0x0a N_INDR +Symbol is indirected to another symbol + +@item 0x12 N_COMM +Common sym -- visable after shared lib dynamic link + +@item 0x14 N_SETA +Absolute set element + +@item 0x16 N_SETT +Text segment set element + +@item 0x18 N_SETD +Data segment set element + +@item 0x1a N_SETB +BSS segment set element + +@item 0x1c N_SETV +Pointer to set vector + +@item 0x1e N_WARNING +Print a warning message during linking + +@item 0x1f N_FN +File name of a .o file +@end table + +The following symbol types indicate that this is a stab. This is the +full list of stab numbers, including stab types that are used in +languages other than C. + +@table @code +@item 0x20 N_GSYM +Global symbol, @xref{N_GSYM}. + +@item 0x22 N_FNAME +Function name (for BSD Fortran), @xref{N_FNAME}. + +@item 0x24 N_FUN +Function name or text segment variable for C, @xref{N_FUN}. + +@item 0x26 N_STSYM +Static symbol (data segment variable with internal linkage), @xref{N_STSYM}. + +@item 0x28 N_LCSYM +.lcomm symbol (BSS segment variable with internal linkage), @xref{N_LCSYM}. + +@item 0x2a N_MAIN +Name of main routine (not used in C), @xref{N_MAIN}. + +@item 0x30 N_PC +Global symbol (for Pascal), @xref{N_PC}. + +@item 0x32 N_NSYMS +Number of symbols (according to Ultrix V4.0), @xref{N_NSYMS}. + +@item 0x34 N_NOMAP +No DST map for sym (according to Ultrix V4.0), @xref{N_NOMAP}. + +@item 0x40 N_RSYM +Register variable, @xref{N_RSYM}. + +@item 0x42 N_M2C +Modula-2 compilation unit, @xref{N_M2C}. + +@item 0x44 N_SLINE +Line number in text segment, @xref{Line Numbers}. + +@item 0x46 N_DSLINE +Line number in data segment, @xref{Line Numbers}. + +@item 0x48 N_BSLINE +Line number in bss segment, @xref{Line Numbers}. + +@item 0x48 N_BROWS +Sun source code browser, path to .cb file, @xref{N_BROWS}. + +@item 0x4a N_DEFD +Gnu Modula2 definition module dependency, @xref{N_DEFD}. + +@item 0x50 N_EHDECL +Gnu C++ exception variable, @xref{N_EHDECL}. + +@item 0x50 N_MOD2 +Modula2 info "for imc" (according to Ultrix V4.0), @xref{N_MOD2}. + +@item 0x54 N_CATCH +Gnu C++ "catch" clause, @xref{N_CATCH}. + +@item 0x60 N_SSYM +Structure of union element, @xref{N_SSYM}. + +@item 0x64 N_SO +Path and name of source file , @xref{Source Files}. + +@item 0x80 N_LSYM +Automatic var in the stack or type definition, @xref{N_LSYM}, @xref{Typedefs}. + +@item 0x82 N_BINCL +Beginning of an include file (Sun only), @xref{Source Files}. + +@item 0x84 N_SOL +Name of sub-source (#include) file., @xref{Source Files}. + +@item 0xa0 N_PSYM +Parameter variable, @xref{Parameters}. + +@item 0xa2 N_EINCL +End of an include file, @xref{Source Files}. + +@item 0xa4 N_ENTRY +Alternate entry point, @xref{N_ENTRY}. + +@item 0xc0 N_LBRAC +Beginning of a lexical block, @xref{N_LBRAC}. + +@item 0xc2 N_EXCL +Place holder for a deleted include file, @xref{Source Files}. + +@item 0xc4 N_SCOPE +Modula2 scope information (Sun linker), @xref{N_SCOPE}. + +@item 0xe0 N_RBRAC +End of a lexical block, @xref{N_RBRAC}. + +@item 0xe2 N_BCOMM +Begin named common block, @xref{N_BCOMM}. + +@item 0xe4 N_ECOMM +End named common block, @xref{N_ECOMM}. + +@item 0xe8 N_ECOML +End common (local name), @xref{N_ECOML}. + +@item 0xf0 N_NBTEXT +<< used on Gould systems for non-base registers syms >>, @xref{Gould}. + +@item 0xf2 N_NBDATA +<< used on Gould systems for non-base registers syms >>, @xref{Gould}. + +@item 0xf4 N_NBBSS +<< used on Gould systems for non-base registers syms >>, @xref{Gould}. + +@item 0xf6 N_NBSTS +<< used on Gould systems for non-base registers syms >>, @xref{Gould}. + +@item 0xf8 N_NBLCS +<< used on Gould systems for non-base registers syms >>, @xref{Gould}. +@end table + +@c Restore the default table indent +@iftex +@tableindent=.8in +@end iftex @node Symbol Descriptors -@appendix Table C: Symbol descriptors +@appendix Table of Symbol Descriptors @c Please keep this alphabetical @table @code @@ -3093,7 +3197,7 @@ Function return variable, @xref{Parameters}. @end table @node Type Descriptors -@appendix Table D: Type Descriptors +@appendix Table of Type Descriptors @table @code @item @var{digit} @@ -3212,10 +3316,12 @@ gstring, @xref{Strings}. @node Expanded reference @appendix Expanded reference by stab type. -@c FIXME: For most types this should be much shorter and much sweeter, -@c see N_PSYM or N_SO for an example. +@c FIXME: This appendix should go away, see N_PSYM or N_SO for an example. -@c FIXME: It probably should be merged with Tables A and B. +For a full list of stab types, and cross-references to where they are +described, @xref{Stab Types}. This appendix just duplicates certain +information from the main body of this document; eventually the +information will all be in one place. Format of an entry: @@ -3245,24 +3351,15 @@ Finally, any further information. * N_NOMAP:: No DST map * N_RSYM:: Register variable * N_M2C:: Modula-2 compilation unit -* N_SLINE: Line Numbers. Line number in text segment -* N_DSLINE: Line Numbers. Line number in data segment -* N_BSLINE: Line Numbers. Line number in bss segment * N_BROWS:: Path to .cb file for Sun source code browser * N_DEFD:: GNU Modula2 definition module dependency * N_EHDECL:: GNU C++ exception variable * N_MOD2:: Modula2 information "for imc" * N_CATCH:: GNU C++ "catch" clause * N_SSYM:: Structure or union element -* N_SO: Source Files. Source file * N_LSYM:: Automatic variable -* N_BINCL: Source Files. Beginning of include file -* N_SOL: Source Files. Name of include file -* N_PSYM: Parameters. Parameter variable -* N_EINCL: Source Files. End of include file * N_ENTRY:: Alternate entry point * N_LBRAC:: Beginning of lexical block -* N_EXCL: Source Files. Deleted include file * N_SCOPE:: Modula2 scope information (Sun only) * N_RBRAC:: End of lexical block * N_BCOMM:: Begin named common block |