300 lines
10 KiB
C
300 lines
10 KiB
C
|
/* DWARF 2 location expression support for GDB.
|
||
|
|
|
||
|
|
Copyright (C) 2003-2022 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
This file is part of GDB.
|
||
|
|
|
||
|
|
This program is free software; you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU General Public License as published by
|
||
|
|
the Free Software Foundation; either version 3 of the License, or
|
||
|
|
(at your option) any later version.
|
||
|
|
|
||
|
|
This program is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
GNU General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU General Public License
|
||
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
#if !defined (DWARF2LOC_H)
|
||
|
|
#define DWARF2LOC_H
|
||
|
|
|
||
|
|
#include "dwarf2/expr.h"
|
||
|
|
|
||
|
|
struct symbol_computed_ops;
|
||
|
|
struct dwarf2_per_objfile;
|
||
|
|
struct dwarf2_per_cu_data;
|
||
|
|
struct dwarf2_loclist_baton;
|
||
|
|
struct agent_expr;
|
||
|
|
struct axs_value;
|
||
|
|
|
||
|
|
/* This header is private to the DWARF-2 reader. It is shared between
|
||
|
|
dwarf2read.c and dwarf2loc.c. */
|
||
|
|
|
||
|
|
/* `set debug entry-values' setting. */
|
||
|
|
extern unsigned int entry_values_debug;
|
||
|
|
|
||
|
|
/* Find a particular location expression from a location list. */
|
||
|
|
const gdb_byte *dwarf2_find_location_expression
|
||
|
|
(struct dwarf2_loclist_baton *baton,
|
||
|
|
size_t *locexpr_length,
|
||
|
|
CORE_ADDR pc);
|
||
|
|
|
||
|
|
/* Find the frame base information for FRAMEFUNC at PC. START is an
|
||
|
|
out parameter which is set to point to the DWARF expression to
|
||
|
|
compute. LENGTH is an out parameter which is set to the length of
|
||
|
|
the DWARF expression. This throws an exception on error or if an
|
||
|
|
expression is not found; the returned length will never be
|
||
|
|
zero. */
|
||
|
|
|
||
|
|
extern void func_get_frame_base_dwarf_block (struct symbol *framefunc,
|
||
|
|
CORE_ADDR pc,
|
||
|
|
const gdb_byte **start,
|
||
|
|
size_t *length);
|
||
|
|
|
||
|
|
/* A helper function to find the definition of NAME and compute its
|
||
|
|
value. Returns nullptr if the name is not found. */
|
||
|
|
|
||
|
|
value *compute_var_value (const char *name);
|
||
|
|
|
||
|
|
/* Fetch call_site_parameter from caller matching KIND and KIND_U.
|
||
|
|
FRAME is for callee.
|
||
|
|
|
||
|
|
Function always returns non-NULL, it throws NO_ENTRY_VALUE_ERROR
|
||
|
|
otherwise. */
|
||
|
|
|
||
|
|
struct call_site_parameter *dwarf_expr_reg_to_entry_parameter
|
||
|
|
(struct frame_info *frame, enum call_site_parameter_kind kind,
|
||
|
|
union call_site_parameter_u kind_u, dwarf2_per_cu_data **per_cu_return,
|
||
|
|
dwarf2_per_objfile **per_objfile_return);
|
||
|
|
|
||
|
|
|
||
|
|
/* Evaluate a location description, starting at DATA and with length
|
||
|
|
SIZE, to find the current location of variable of TYPE in the context
|
||
|
|
of FRAME. AS_LVAL defines if the resulting struct value is expected to
|
||
|
|
be a value or a location description. */
|
||
|
|
|
||
|
|
struct value *dwarf2_evaluate_loc_desc (struct type *type,
|
||
|
|
struct frame_info *frame,
|
||
|
|
const gdb_byte *data,
|
||
|
|
size_t size,
|
||
|
|
dwarf2_per_cu_data *per_cu,
|
||
|
|
dwarf2_per_objfile *per_objfile,
|
||
|
|
bool as_lval = true);
|
||
|
|
|
||
|
|
/* A chain of addresses that might be needed to resolve a dynamic
|
||
|
|
property. */
|
||
|
|
|
||
|
|
struct property_addr_info
|
||
|
|
{
|
||
|
|
/* The type of the object whose dynamic properties, if any, are
|
||
|
|
being resolved. */
|
||
|
|
struct type *type;
|
||
|
|
|
||
|
|
/* If not NULL, a buffer containing the object's value. */
|
||
|
|
gdb::array_view<const gdb_byte> valaddr;
|
||
|
|
|
||
|
|
/* The address of that object. */
|
||
|
|
CORE_ADDR addr;
|
||
|
|
|
||
|
|
/* If not NULL, a pointer to the info for the object containing
|
||
|
|
the object described by this node. */
|
||
|
|
struct property_addr_info *next;
|
||
|
|
};
|
||
|
|
|
||
|
|
/* Converts a dynamic property into a static one. FRAME is the frame in which
|
||
|
|
the property is evaluated; if NULL, the selected frame (if any) is used
|
||
|
|
instead.
|
||
|
|
|
||
|
|
ADDR_STACK is the stack of addresses that might be needed to evaluate the
|
||
|
|
property. When evaluating a property that is not related to a type, it can
|
||
|
|
be NULL.
|
||
|
|
|
||
|
|
Returns true if PROP could be converted and the static value is passed
|
||
|
|
back into VALUE, otherwise returns false.
|
||
|
|
|
||
|
|
Any values in PUSH_VALUES will be pushed before evaluating the location
|
||
|
|
expression, PUSH_VALUES[0] will be pushed first, then PUSH_VALUES[1],
|
||
|
|
etc. This means the during evaluation PUSH_VALUES[0] will be at the
|
||
|
|
bottom of the stack. */
|
||
|
|
|
||
|
|
bool dwarf2_evaluate_property (const struct dynamic_prop *prop,
|
||
|
|
struct frame_info *frame,
|
||
|
|
const struct property_addr_info *addr_stack,
|
||
|
|
CORE_ADDR *value,
|
||
|
|
gdb::array_view<CORE_ADDR> push_values = {});
|
||
|
|
|
||
|
|
/* A helper for the compiler interface that compiles a single dynamic
|
||
|
|
property to C code.
|
||
|
|
|
||
|
|
STREAM is where the C code is to be written.
|
||
|
|
RESULT_NAME is the name of the generated variable.
|
||
|
|
GDBARCH is the architecture to use.
|
||
|
|
REGISTERS_USED is a bit-vector that is filled to note which
|
||
|
|
registers are required by the generated expression.
|
||
|
|
PROP is the property for which code is generated.
|
||
|
|
ADDRESS is the address at which the property is considered to be
|
||
|
|
evaluated.
|
||
|
|
SYM the originating symbol, used for error reporting. */
|
||
|
|
|
||
|
|
void dwarf2_compile_property_to_c (string_file *stream,
|
||
|
|
const char *result_name,
|
||
|
|
struct gdbarch *gdbarch,
|
||
|
|
std::vector<bool> ®isters_used,
|
||
|
|
const struct dynamic_prop *prop,
|
||
|
|
CORE_ADDR address,
|
||
|
|
struct symbol *sym);
|
||
|
|
|
||
|
|
/* The symbol location baton types used by the DWARF-2 reader (i.e.
|
||
|
|
SYMBOL_LOCATION_BATON for a LOC_COMPUTED symbol). "struct
|
||
|
|
dwarf2_locexpr_baton" is for a symbol with a single location
|
||
|
|
expression; "struct dwarf2_loclist_baton" is for a symbol with a
|
||
|
|
location list. */
|
||
|
|
|
||
|
|
struct dwarf2_locexpr_baton
|
||
|
|
{
|
||
|
|
/* Pointer to the start of the location expression. Valid only if SIZE is
|
||
|
|
not zero. */
|
||
|
|
const gdb_byte *data;
|
||
|
|
|
||
|
|
/* Length of the location expression. For optimized out expressions it is
|
||
|
|
zero. */
|
||
|
|
size_t size;
|
||
|
|
|
||
|
|
/* When true this location expression is a reference and actually
|
||
|
|
describes the address at which the value of the attribute can be
|
||
|
|
found. When false the expression provides the value of the attribute
|
||
|
|
directly. */
|
||
|
|
bool is_reference;
|
||
|
|
|
||
|
|
/* The objfile that was used when creating this. */
|
||
|
|
dwarf2_per_objfile *per_objfile;
|
||
|
|
|
||
|
|
/* The compilation unit containing the symbol whose location
|
||
|
|
we're computing. */
|
||
|
|
struct dwarf2_per_cu_data *per_cu;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct dwarf2_loclist_baton
|
||
|
|
{
|
||
|
|
/* The initial base address for the location list, based on the compilation
|
||
|
|
unit. */
|
||
|
|
CORE_ADDR base_address;
|
||
|
|
|
||
|
|
/* Pointer to the start of the location list. */
|
||
|
|
const gdb_byte *data;
|
||
|
|
|
||
|
|
/* Length of the location list. */
|
||
|
|
size_t size;
|
||
|
|
|
||
|
|
/* The objfile that was used when creating this. */
|
||
|
|
dwarf2_per_objfile *per_objfile;
|
||
|
|
|
||
|
|
/* The compilation unit containing the symbol whose location
|
||
|
|
we're computing. */
|
||
|
|
struct dwarf2_per_cu_data *per_cu;
|
||
|
|
|
||
|
|
/* Non-zero if the location list lives in .debug_loc.dwo.
|
||
|
|
The format of entries in this section are different. */
|
||
|
|
unsigned char from_dwo;
|
||
|
|
};
|
||
|
|
|
||
|
|
/* The baton used when a dynamic property is an offset to a parent
|
||
|
|
type. This can be used, for instance, then the bound of an array
|
||
|
|
inside a record is determined by the value of another field inside
|
||
|
|
that record. */
|
||
|
|
|
||
|
|
struct dwarf2_offset_baton
|
||
|
|
{
|
||
|
|
/* The offset from the parent type where the value of the property
|
||
|
|
is stored. In the example provided above, this would be the offset
|
||
|
|
of the field being used as the array bound. */
|
||
|
|
LONGEST offset;
|
||
|
|
|
||
|
|
/* The type of the object whose property is dynamic. In the example
|
||
|
|
provided above, this would the array's index type. */
|
||
|
|
struct type *type;
|
||
|
|
};
|
||
|
|
|
||
|
|
/* A dynamic property is either expressed as a single location expression
|
||
|
|
or a location list. If the property is an indirection, pointing to
|
||
|
|
another die, keep track of the targeted type in PROPERTY_TYPE.
|
||
|
|
Alternatively, if the property location gives the property value
|
||
|
|
directly then it will have PROPERTY_TYPE. */
|
||
|
|
|
||
|
|
struct dwarf2_property_baton
|
||
|
|
{
|
||
|
|
/* If the property is an indirection, we need to evaluate the location
|
||
|
|
in the context of the type PROPERTY_TYPE. If the property is supplied
|
||
|
|
by value then it will be of PROPERTY_TYPE. This field should never be
|
||
|
|
NULL. */
|
||
|
|
struct type *property_type;
|
||
|
|
union
|
||
|
|
{
|
||
|
|
/* Location expression either evaluated in the context of
|
||
|
|
PROPERTY_TYPE, or a value of type PROPERTY_TYPE. */
|
||
|
|
struct dwarf2_locexpr_baton locexpr;
|
||
|
|
|
||
|
|
/* Location list to be evaluated in the context of PROPERTY_TYPE. */
|
||
|
|
struct dwarf2_loclist_baton loclist;
|
||
|
|
|
||
|
|
/* The location is an offset to PROPERTY_TYPE. */
|
||
|
|
struct dwarf2_offset_baton offset_info;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
extern const struct symbol_computed_ops dwarf2_locexpr_funcs;
|
||
|
|
extern const struct symbol_computed_ops dwarf2_loclist_funcs;
|
||
|
|
|
||
|
|
extern const struct symbol_block_ops dwarf2_block_frame_base_locexpr_funcs;
|
||
|
|
extern const struct symbol_block_ops dwarf2_block_frame_base_loclist_funcs;
|
||
|
|
|
||
|
|
/* Determined tail calls for constructing virtual tail call frames. */
|
||
|
|
|
||
|
|
struct call_site_chain
|
||
|
|
{
|
||
|
|
/* Initially CALLERS == CALLEES == LENGTH. For partially ambiguous result
|
||
|
|
CALLERS + CALLEES < LENGTH. */
|
||
|
|
int callers, callees, length;
|
||
|
|
|
||
|
|
/* Variably sized array with LENGTH elements. Later [0..CALLERS-1] contain
|
||
|
|
top (GDB "prev") sites and [LENGTH-CALLEES..LENGTH-1] contain bottom
|
||
|
|
(GDB "next") sites. One is interested primarily in the PC field. */
|
||
|
|
struct call_site *call_site[1];
|
||
|
|
};
|
||
|
|
|
||
|
|
extern gdb::unique_xmalloc_ptr<call_site_chain> call_site_find_chain
|
||
|
|
(struct gdbarch *gdbarch, CORE_ADDR caller_pc, CORE_ADDR callee_pc);
|
||
|
|
|
||
|
|
/* A helper function to convert a DWARF register to an arch register.
|
||
|
|
ARCH is the architecture.
|
||
|
|
DWARF_REG is the register.
|
||
|
|
If DWARF_REG is bad then a complaint is issued and -1 is returned.
|
||
|
|
Note: Some targets get this wrong. */
|
||
|
|
|
||
|
|
extern int dwarf_reg_to_regnum (struct gdbarch *arch, int dwarf_reg);
|
||
|
|
|
||
|
|
/* A wrapper on dwarf_reg_to_regnum to throw an exception if the
|
||
|
|
DWARF register cannot be translated to an architecture register.
|
||
|
|
This takes a ULONGEST instead of an int because some callers actually have
|
||
|
|
a ULONGEST. Negative values passed as ints will still be flagged as
|
||
|
|
invalid. */
|
||
|
|
|
||
|
|
extern int dwarf_reg_to_regnum_or_error (struct gdbarch *arch,
|
||
|
|
ULONGEST dwarf_reg);
|
||
|
|
|
||
|
|
/* Helper function which throws an error if a synthetic pointer is
|
||
|
|
invalid. */
|
||
|
|
|
||
|
|
extern void invalid_synthetic_pointer ();
|
||
|
|
|
||
|
|
/* Fetch the value pointed to by a synthetic pointer. */
|
||
|
|
|
||
|
|
extern struct value *indirect_synthetic_pointer
|
||
|
|
(sect_offset die, LONGEST byte_offset, dwarf2_per_cu_data *per_cu,
|
||
|
|
dwarf2_per_objfile *per_objfile, struct frame_info *frame,
|
||
|
|
struct type *type, bool resolve_abstract_p = false);
|
||
|
|
|
||
|
|
#endif /* DWARF2LOC_H */
|