/* DWARF 2 Expression Evaluator.
- Copyright (C) 2001-2003, 2005, 2007-2012 Free Software Foundation,
- Inc.
+ Copyright (C) 2001-2016 Free Software Foundation, Inc.
Contributed by Daniel Berlin <dan@dberlin.org>.
#define DWARF2EXPR_H
#include "leb128.h"
-
-struct dwarf_expr_context;
-enum call_site_parameter_kind;
-union call_site_parameter_u;
-
-/* Offset relative to the start of its containing CU (compilation unit). */
-typedef struct
-{
- unsigned int cu_off;
-} cu_offset;
-
-/* Offset relative to the start of its .debug_info or .debug_types section. */
-typedef struct
-{
- unsigned int sect_off;
-} sect_offset;
-
-/* Virtual method table for struct dwarf_expr_context below. */
-
-struct dwarf_expr_context_funcs
-{
- /* Return the value of register number REGNUM. */
- CORE_ADDR (*read_reg) (void *baton, int regnum);
-
- /* Read LENGTH bytes at ADDR into BUF. */
- void (*read_mem) (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t length);
-
- /* Return the location expression for the frame base attribute, in
- START and LENGTH. The result must be live until the current
- expression evaluation is complete. */
- void (*get_frame_base) (void *baton, const gdb_byte **start, size_t *length);
-
- /* Return the CFA for the frame. */
- CORE_ADDR (*get_frame_cfa) (void *baton);
-
- /* Return the PC for the frame. */
- CORE_ADDR (*get_frame_pc) (void *baton);
-
- /* Return the thread-local storage address for
- DW_OP_GNU_push_tls_address. */
- CORE_ADDR (*get_tls_address) (void *baton, CORE_ADDR offset);
-
- /* Execute DW_AT_location expression for the DWARF expression subroutine in
- the DIE at DIE_OFFSET in the CU from CTX. Do not touch STACK while it
- being passed to and returned from the called DWARF subroutine. */
- void (*dwarf_call) (struct dwarf_expr_context *ctx, cu_offset die_offset);
-
- /* Return the base type given by the indicated DIE. This can throw
- an exception if the DIE is invalid or does not represent a base
- type. If can also be NULL in the special case where the
- callbacks are not performing evaluation, and thus it is
- meaningful to substitute a stub type of the correct size. */
- struct type *(*get_base_type) (struct dwarf_expr_context *ctx, cu_offset die);
-
- /* Push on DWARF stack an entry evaluated for DW_TAG_GNU_call_site's
- parameter matching KIND and KIND_U at the caller of specified BATON.
- If DEREF_SIZE is not -1 then use DW_AT_GNU_call_site_data_value instead of
- DW_AT_GNU_call_site_value. */
- void (*push_dwarf_reg_entry_value) (struct dwarf_expr_context *ctx,
- enum call_site_parameter_kind kind,
- union call_site_parameter_u kind_u,
- int deref_size);
-
- /* Return the address indexed by DW_OP_GNU_addr_index.
- This can throw an exception if the index is out of range. */
- CORE_ADDR (*get_addr_index) (void *baton, unsigned int index);
-
-#if 0
- /* Not yet implemented. */
-
- /* Return the `object address' for DW_OP_push_object_address. */
- CORE_ADDR (*get_object_address) (void *baton);
-#endif
-};
+#include "gdbtypes.h"
/* The location of a value. */
enum dwarf_value_location
its current state and its callbacks. */
struct dwarf_expr_context
{
+ dwarf_expr_context ();
+ virtual ~dwarf_expr_context ();
+
+ void push_address (CORE_ADDR value, int in_stack_memory);
+ void eval (const gdb_byte *addr, size_t len);
+ struct value *fetch (int n);
+ CORE_ADDR fetch_address (int n);
+ int fetch_in_stack_memory (int n);
+
/* The stack of values, allocated with xmalloc. */
struct dwarf_stack_value *stack;
context and operations depending on DW_FORM_ref_addr are not allowed. */
int ref_addr_size;
- /* Offset used to relocate DW_OP_addr argument. */
+ /* Offset used to relocate DW_OP_addr and DW_OP_GNU_addr_index arguments. */
CORE_ADDR offset;
- /* An opaque argument provided by the caller, which will be passed
- to all of the callback functions. */
- void *baton;
-
- /* Callback functions. */
- const struct dwarf_expr_context_funcs *funcs;
-
/* The current depth of dwarf expression recursion, via DW_OP_call*,
DW_OP_fbreg, DW_OP_push_object_address, etc., and the maximum
depth we'll tolerate before raising an error. */
/* For DWARF_VALUE_LITERAL, the current literal value's length and
data. For DWARF_VALUE_IMPLICIT_POINTER, LEN is the offset of the
- target DIE of cu_offset kind. */
+ target DIE of sect_offset kind. */
ULONGEST len;
const gdb_byte *data;
two cases need to be handled separately.) */
int num_pieces;
struct dwarf_expr_piece *pieces;
+
+ /* Return the value of register number REGNUM (a DWARF register number),
+ read as an address. */
+ virtual CORE_ADDR read_addr_from_reg (int regnum) = 0;
+
+ /* Return a value of type TYPE, stored in register number REGNUM
+ of the frame associated to the given BATON.
+
+ REGNUM is a DWARF register number. */
+ virtual struct value *get_reg_value (struct type *type, int regnum) = 0;
+
+ /* Read LENGTH bytes at ADDR into BUF. */
+ virtual void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t length) = 0;
+
+ /* Return the location expression for the frame base attribute, in
+ START and LENGTH. The result must be live until the current
+ expression evaluation is complete. */
+ virtual void get_frame_base (const gdb_byte **start, size_t *length) = 0;
+
+ /* Return the CFA for the frame. */
+ virtual CORE_ADDR get_frame_cfa () = 0;
+
+ /* Return the PC for the frame. */
+ virtual CORE_ADDR get_frame_pc ()
+ {
+ error (_("%s is invalid in this context"), "DW_OP_GNU_implicit_pointer");
+ }
+
+ /* Return the thread-local storage address for
+ DW_OP_GNU_push_tls_address or DW_OP_form_tls_address. */
+ virtual CORE_ADDR get_tls_address (CORE_ADDR offset) = 0;
+
+ /* Execute DW_AT_location expression for the DWARF expression
+ subroutine in the DIE at DIE_OFFSET in the CU. Do not touch
+ STACK while it being passed to and returned from the called DWARF
+ subroutine. */
+ virtual void dwarf_call (cu_offset die_offset) = 0;
+
+ /* Return the base type given by the indicated DIE. This can throw
+ an exception if the DIE is invalid or does not represent a base
+ type. SIZE is non-zero if this function should verify that the
+ resulting type has the correct size. */
+ virtual struct type *get_base_type (cu_offset die, int size)
+ {
+ /* Anything will do. */
+ return builtin_type (this->gdbarch)->builtin_int;
+ }
+
+ /* Push on DWARF stack an entry evaluated for DW_TAG_GNU_call_site's
+ parameter matching KIND and KIND_U at the caller of specified BATON.
+ If DEREF_SIZE is not -1 then use DW_AT_GNU_call_site_data_value instead of
+ DW_AT_GNU_call_site_value. */
+ virtual void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind,
+ union call_site_parameter_u kind_u,
+ int deref_size) = 0;
+
+ /* Return the address indexed by DW_OP_GNU_addr_index.
+ This can throw an exception if the index is out of range. */
+ virtual CORE_ADDR get_addr_index (unsigned int index) = 0;
+
+ /* Return the `object address' for DW_OP_push_object_address. */
+ virtual CORE_ADDR get_object_address () = 0;
+
+private:
+
+ struct type *address_type () const;
+ void grow_stack (size_t need);
+ void push (struct value *value, int in_stack_memory);
+ int stack_empty_p () const;
+ void add_piece (ULONGEST size, ULONGEST offset);
+ void execute_stack_op (const gdb_byte *op_ptr, const gdb_byte *op_end);
+ void pop ();
};
struct
{
/* The referent DIE from DW_OP_GNU_implicit_pointer. */
- cu_offset die;
+ sect_offset die;
/* The byte offset into the resulting data. */
LONGEST offset;
} ptr;
ULONGEST offset;
};
-struct dwarf_expr_context *new_dwarf_expr_context (void);
-void free_dwarf_expr_context (struct dwarf_expr_context *ctx);
-struct cleanup *
- make_cleanup_free_dwarf_expr_context (struct dwarf_expr_context *ctx);
-
-void dwarf_expr_push_address (struct dwarf_expr_context *ctx,
- CORE_ADDR value,
- int in_stack_memory);
-void dwarf_expr_eval (struct dwarf_expr_context *ctx, const gdb_byte *addr,
- size_t len);
-struct value *dwarf_expr_fetch (struct dwarf_expr_context *ctx, int n);
-CORE_ADDR dwarf_expr_fetch_address (struct dwarf_expr_context *ctx, int n);
-int dwarf_expr_fetch_in_stack_memory (struct dwarf_expr_context *ctx, int n);
-
void dwarf_expr_require_composition (const gdb_byte *, const gdb_byte *,
const char *);
-/* Stub dwarf_expr_context_funcs implementations. */
-
-void ctx_no_get_frame_base (void *baton, const gdb_byte **start,
- size_t *length);
-CORE_ADDR ctx_no_get_frame_cfa (void *baton);
-CORE_ADDR ctx_no_get_frame_pc (void *baton);
-CORE_ADDR ctx_no_get_tls_address (void *baton, CORE_ADDR offset);
-void ctx_no_dwarf_call (struct dwarf_expr_context *ctx, cu_offset die_offset);
-struct type *ctx_no_get_base_type (struct dwarf_expr_context *ctx,
- cu_offset die);
-void ctx_no_push_dwarf_reg_entry_value (struct dwarf_expr_context *ctx,
- enum call_site_parameter_kind kind,
- union call_site_parameter_u kind_u,
- int deref_size);
-CORE_ADDR ctx_no_get_addr_index (void *baton, unsigned int index);
-
int dwarf_block_to_dwarf_reg (const gdb_byte *buf, const gdb_byte *buf_end);
int dwarf_block_to_dwarf_reg_deref (const gdb_byte *buf,
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