* stabs.texinfo: When explaining the n_type of a stab, standardize
how we do it ('#' as a comment indicator, "36 is N_FUN" as text,
no tabs, use @r).
(Global Variables): Clean up.
This commit is contained in:
Jim Kingdon
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34a6ce551a
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@ -1,3 +1,10 @@
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Fri Aug 20 20:49:53 1993 Jim Kingdon (kingdon@lioth.cygnus.com)
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* stabs.texinfo: When explaining the n_type of a stab, standardize
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how we do it ('#' as a comment indicator, "36 is N_FUN" as text,
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no tabs, use @r).
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(Global Variables): Clean up.
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Tue Aug 17 15:57:27 1993 Jim Kingdon (kingdon@lioth.cygnus.com)
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* stabs.texinfo (Stack Variables): Re-write.
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@ -400,7 +400,7 @@ these are believed to contain no useful information.
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For example:
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@example
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.stabs "/cygint/s1/users/jcm/play/",100,0,0,Ltext0 ; 100 is N_SO
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.stabs "/cygint/s1/users/jcm/play/",100,0,0,Ltext0 # @r{100 is N_SO}
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.stabs "hello.c",100,0,0,Ltext0
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.text
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Ltext0:
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@ -560,7 +560,7 @@ foo (int x)
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produces the stabs:
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@example
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.stabs "baz:f1,baz,bar",36,0,0,_baz.15 # 36 == N_FUN
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.stabs "baz:f1,baz,bar",36,0,0,_baz.15 # @r{36 is N_FUN}
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.stabs "bar:f1,bar,foo",36,0,0,_bar.12
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.stabs "foo:F1",36,0,0,_foo
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@end example
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@ -887,60 +887,46 @@ main ()
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produces the following stabs
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@example
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.stabs "main:F1",36,0,0,_main # N_FUN
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.stabs "x:1",128,0,0,-12 # N_LSYM
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.stabn 192,0,0,LBB2 # N_LBRAC
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.stabn 224,0,0,LBE2 # N_RBRAC
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.stabs "main:F1",36,0,0,_main # @r{36 is N_FUN}
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.stabs "x:1",128,0,0,-12 # @r{128 is N_LSYM}
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.stabn 192,0,0,LBB2 # @r{192 is N_LBRAC}
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.stabn 224,0,0,LBE2 # @r{224 is N_RBRAC}
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@end example
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@xref{Procedures} for more information on the @samp{F} symbol desciptor,
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and @ref{Block Structure} for more information on the @code{N_LBRAC} and
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@code{N_RBRAC} symbols.
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@xref{Procedures} for more information on the first stab, and @ref{Block
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Structure} for more information on the @code{N_LBRAC} and @code{N_RBRAC}
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stabs.
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@node Global Variables
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@section Global Variables
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@table @strong
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@item Directive:
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@code{.stabs}
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@item Type:
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@code{N_GSYM}
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@item Symbol Descriptor:
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@code{G}
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@end table
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A variable whose scope which is not specific to just one source file is
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represented by the @samp{G} symbol descriptor. These stabs use the
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@code{N_GSYM} stab type. The type information for the stab
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(@pxref{Stabs Format}) gives the type of the variable.
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Global variables are represented by the @code{N_GSYM} stab type. The symbol
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descriptor, following the colon in the string field, is @samp{G}. Following
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the @samp{G} is a type reference or type definition. In this example it is a
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type reference to the basic C type, @code{char}. The first source line in
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@file{example2.c},
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For example, the following source code:
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@example
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1 char g_foo = 'c';
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char g_foo = 'c';
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@end example
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@noindent
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yields the following stab. The stab immediately precedes the code that
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allocates storage for the variable it describes.
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yields the following assembly code:
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@example
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@exdent @code{N_GSYM} (32): global symbol
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.stabs "@var{name}:
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@var{descriptor}
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@var{type-ref}",
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N_GSYM, NIL, NIL, NIL
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21 .stabs "g_foo:G2",32,0,0,0
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22 .global _g_foo
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23 .data
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24 _g_foo:
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25 .byte 99
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.stabs "g_foo:G2",32,0,0,0 # @r{32 is N_GSYM}
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.global _g_foo
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.data
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_g_foo:
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.byte 99
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@end example
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The address of the variable represented by the @code{N_GSYM} is not contained
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in the @code{N_GSYM} stab. The debugger gets this information from the
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external symbol for the global variable.
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The address of the variable represented by the @code{N_GSYM} is not
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contained in the @code{N_GSYM} stab. The debugger gets this information
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from the external symbol for the global variable. In the example above,
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the @code{.global _g_foo} and @code{_g_foo:} lines tell the assembler to
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produce an external symbol.
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@node Register variables
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@section Register variables
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@ -1027,11 +1013,11 @@ static int var_noinit;
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yield the following stabs:
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@example
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.stabs "var_const:S1",36,0,0,_var_const ; @r{36 = N_FUN}
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.stabs "var_const:S1",36,0,0,_var_const # @r{36 is N_FUN}
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. . .
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.stabs "var_init:S1",38,0,0,_var_init ; @r{38 = N_STSYM}
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.stabs "var_init:S1",38,0,0,_var_init # @r{38 is N_STSYM}
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. . .
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.stabs "var_noinit:S1",40,0,0,_var_noinit ; @r{40 = N_LCSYM}
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.stabs "var_noinit:S1",40,0,0,_var_noinit # @r{40 is N_LCSYM}
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@end example
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@node Parameters
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@ -1050,8 +1036,8 @@ If the parameter is passed in a register, then the traditional way to do
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this is to provide two symbols for each argument:
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@example
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.stabs "arg:p1" . . . ; N_PSYM
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.stabs "arg:r1" . . . ; N_RSYM
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.stabs "arg:p1" . . . ; N_PSYM
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.stabs "arg:r1" . . . ; N_RSYM
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@end example
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Debuggers are expected to use the second one to find the value, and the
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@ -1150,8 +1136,8 @@ main (argc, argv)
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produces the stabs
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@example
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.stabs "main:F1",36,0,0,_main ; 36 is N_FUN
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.stabs "argc:p1",160,0,0,68 ; 160 is N_PSYM
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.stabs "main:F1",36,0,0,_main # @r{36 is N_FUN}
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.stabs "argc:p1",160,0,0,68 # @r{160 is N_PSYM}
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.stabs "argv:p20=*21=*2",160,0,0,72
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@end example
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@ -1213,7 +1199,7 @@ Often types are defined as subranges of themselves. If the array bounds
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can fit within an @code{int}, then they are given normally. For example:
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@example
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.stabs "int:t1=r1;-2147483648;2147483647;",128,0,0,0 ; 128 is N_LSYM
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.stabs "int:t1=r1;-2147483648;2147483647;",128,0,0,0 # @r{128 is N_LSYM}
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.stabs "char:t2=r2;0;127;",128,0,0,0
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@end example
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