/* DWARF 2 Expression Evaluator.
- Copyright (C) 2001, 2002, 2003, 2005, 2007, 2008, 2009, 2010
+ Copyright (C) 2001, 2002, 2003, 2005, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
Contributed by Daniel Berlin <dan@dberlin.org>.
#if !defined (DWARF2EXPR_H)
#define DWARF2EXPR_H
+struct dwarf_expr_context;
+
+/* 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, size_t 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, size_t die);
+
+#if 0
+ /* Not yet implemented. */
+
+ /* Return the `object address' for DW_OP_push_object_address. */
+ CORE_ADDR (*get_object_address) (void *baton);
+#endif
+};
+
/* The location of a value. */
enum dwarf_value_location
{
struct dwarf_stack_value
{
- ULONGEST value;
+ struct value *value;
/* Non-zero if the piece is in memory and is known to be
on the program's stack. It is always ok to set this to zero.
to all of the callback functions. */
void *baton;
- /* 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, size_t die_offset);
-
-#if 0
- /* Not yet implemented. */
-
- /* Return the `object address' for DW_OP_push_object_address. */
- CORE_ADDR (*get_object_address) (void *baton);
-#endif
+ /* 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
/* Location of the value. */
enum dwarf_value_location location;
- /* For DWARF_VALUE_LITERAL, a the current literal value's length and
+ /* 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. */
ULONGEST len;
int in_stack_memory;
} mem;
- /* The piece's register number or literal value, for
- DWARF_VALUE_REGISTER or DWARF_VALUE_STACK pieces. */
- ULONGEST value;
+ /* The piece's register number, for DWARF_VALUE_REGISTER pieces. */
+ int regno;
+
+ /* The piece's literal value, for DWARF_VALUE_STACK pieces. */
+ struct value *value;
struct
{
struct cleanup *
make_cleanup_free_dwarf_expr_context (struct dwarf_expr_context *ctx);
-void dwarf_expr_push (struct dwarf_expr_context *ctx, ULONGEST value,
- int in_stack_memory);
-void dwarf_expr_pop (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);
-ULONGEST dwarf_expr_fetch (struct dwarf_expr_context *ctx, int n);
+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);
const gdb_byte *read_sleb128 (const gdb_byte *buf, const gdb_byte *buf_end,
LONGEST * r);
-const char *dwarf_stack_op_name (unsigned int, int);
+const char *dwarf_stack_op_name (unsigned int);
void dwarf_expr_require_composition (const gdb_byte *, const gdb_byte *,
const char *);
+/* Stub dwarf_expr_context_funcs implementations. */
+
+CORE_ADDR ctx_no_read_reg (void *baton, int regnum);
+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, size_t die_offset);
+struct type *ctx_no_get_base_type (struct dwarf_expr_context *ctx, size_t die);
+
#endif /* dwarf2expr.h */
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