* symtab.h: Clean up SYMBOL_VALUE comments.
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Jim Kingdon
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@ -1,3 +1,7 @@
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Thu Apr 22 09:07:24 1993 Jim Kingdon (kingdon@cygnus.com)
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* symtab.h: Clean up SYMBOL_VALUE comments.
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Wed Apr 21 14:29:57 1993 Jim Kingdon (kingdon@cygnus.com)
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* stack.c (print_frame_arg_vars), printcmd.c (print_frame_args):
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67
gdb/symtab.h
67
gdb/symtab.h
@ -37,32 +37,20 @@ struct general_symbol_info
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char *name;
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/* Constant value, or address if static, or register number,
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or offset in arguments, or offset in stack frame. All of
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these are in host byte order (though what they point to might
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be in target byte order, e.g. LOC_CONST_BYTES).
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Note that the address of a function is SYMBOL_VALUE_ADDRESS (pst)
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in a partial symbol table, but BLOCK_START (SYMBOL_BLOCK_VALUE (st))
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in a symbol table. */
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/* Value of the symbol. Which member of this union to use, and what
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it means, depends on what kind of symbol this is and its
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SYMBOL_CLASS. See comments there for more details. All of these
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are in host byte order (though what they point to might be in
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target byte order, e.g. LOC_CONST_BYTES). */
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union
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{
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/* for LOC_CONST, LOC_REGISTER, LOC_ARG, LOC_REF_ARG, LOC_REGPARM,
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LOC_LOCAL */
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long value;
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/* for LOC_BLOCK */
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struct block *block;
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/* for LOC_CONST_BYTES */
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char *bytes;
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/* for LOC_STATIC, LOC_LABEL */
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CORE_ADDR address;
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/* for opaque typedef struct chain */
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@ -267,7 +255,10 @@ extern int demangle; /* We reference it, so go ahead and declare it. */
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struct minimal_symbol
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{
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/* The general symbol info required for all types of symbols. */
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/* The general symbol info required for all types of symbols.
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The SYMBOL_VALUE_ADDRESS contains the address that this symbol
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corresponds to. */
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struct general_symbol_info ginfo;
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@ -449,25 +440,26 @@ enum address_class
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LOC_STATIC,
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/* Value is in register */
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/* Value is in register. SYMBOL_VALUE is the register number. */
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LOC_REGISTER,
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/* Value is at spec'd offset in arglist */
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/* It's an argument; the value is at SYMBOL_VALUE offset in arglist. */
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LOC_ARG,
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/* Value address is at spec'd offset in arglist. Currently this is used
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for C++ references (and presumably will be used for Pascal VAR
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parameters), and is only dereferenced in certain contexts. */
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/* Value address is at SYMBOL_VALUE offset in arglist. Currently
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this is used for C++ references (and presumably will be used for
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Pascal VAR parameters), and is only dereferenced in certain
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contexts. */
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LOC_REF_ARG,
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/* Value is in specified register. Just like LOC_REGISTER except this is
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an argument. Probably the cleaner way to handle this would be to
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separate address_class (which would include separate ARG and LOCAL
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to deal with FRAME_ARGS_ADDRESS versus FRAME_LOCALS_ADDRESS), and
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an is_argument flag.
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/* Value is in register number SYMBOL_VALUE. Just like LOC_REGISTER
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except this is an argument. Probably the cleaner way to handle
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this would be to separate address_class (which would include
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separate ARG and LOCAL to deal with FRAME_ARGS_ADDRESS versus
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FRAME_LOCALS_ADDRESS), and an is_argument flag.
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For some symbol formats (stabs, for some compilers at least),
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gdb generates a LOC_ARG and a LOC_REGISTER rather than a LOC_REGPARM.
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@ -477,7 +469,7 @@ enum address_class
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LOC_REGPARM,
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/* Value is at spec'd offset in stack frame */
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/* Value is a local variable at SYMBOL_VALUE offset in stack frame. */
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LOC_LOCAL,
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@ -490,8 +482,9 @@ enum address_class
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LOC_LABEL,
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/* Value is address SYMBOL_VALUE_BLOCK of a `struct block'. Function names
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have this class. */
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/* In a symbol table, value is SYMBOL_BLOCK_VALUE of a `struct block'.
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In a partial symbol table, SYMBOL_VALUE_ADDRESS is the start address
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of the block. Function names have this class. */
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LOC_BLOCK,
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@ -500,16 +493,16 @@ enum address_class
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LOC_CONST_BYTES,
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/* Value is arg at spec'd offset in stack frame. Differs from LOC_LOCAL in
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that symbol is an argument; differs from LOC_ARG in that we find it
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in the frame (FRAME_LOCALS_ADDRESS), not in the arglist
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(FRAME_ARGS_ADDRESS). Added for i960, which passes args in regs then
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copies to frame. */
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/* Value is arg at SYMBOL_VALUE offset in stack frame. Differs from
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LOC_LOCAL in that symbol is an argument; differs from LOC_ARG in
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that we find it in the frame (FRAME_LOCALS_ADDRESS), not in the
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arglist (FRAME_ARGS_ADDRESS). Added for i960, which passes args
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in regs then copies to frame. */
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LOC_LOCAL_ARG,
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/* The variable does not actually exist in the program.
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The SYMBOL_VALUE is ignored. */
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The value is ignored. */
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LOC_OPTIMIZED_OUT
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};
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