/* DWARF 2 Expression Evaluator.
- Copyright (C) 2001, 2002, 2003, 2005, 2007, 2008, 2009, 2010
- Free Software Foundation, Inc.
+ Copyright (C) 2001-2016 Free Software Foundation, Inc.
Contributed by Daniel Berlin <dan@dberlin.org>.
#if !defined (DWARF2EXPR_H)
#define DWARF2EXPR_H
+#include "leb128.h"
+#include "gdbtypes.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 (a DWARF register number),
+ read as an address. */
+ CORE_ADDR (*read_addr_from_reg) (void *baton, int regnum);
+
+ /* 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. */
+ struct value *(*get_reg_value) (void *baton, struct type *type, 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);
+
+ /* Return the `object address' for DW_OP_push_object_address. */
+ CORE_ADDR (*get_object_address) (void *baton);
+};
+
/* The location of a value. */
enum dwarf_value_location
{
DWARF_VALUE_LITERAL,
/* The piece was optimized out. */
- DWARF_VALUE_OPTIMIZED_OUT
+ DWARF_VALUE_OPTIMIZED_OUT,
+
+ /* The piece is an implicit pointer. */
+ DWARF_VALUE_IMPLICIT_POINTER
};
/* The dwarf expression stack. */
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.
/* Target address size in bytes. */
int addr_size;
- /* Offset used to relocate DW_OP_addr argument. */
+ /* DW_FORM_ref_addr size in bytes. If -1 DWARF is executed from a frame
+ context and operations depending on DW_FORM_ref_addr are not allowed. */
+ int ref_addr_size;
+
+ /* 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;
- /* 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 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 VALUE_LITERAL, a the current literal value's length and
- data. */
+ /* 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 sect_offset kind. */
ULONGEST len;
const gdb_byte *data;
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
{
/* The length of the available data. */
ULONGEST length;
} literal;
+
+ /* Used for DWARF_VALUE_IMPLICIT_POINTER. */
+ struct
+ {
+ /* The referent DIE from DW_OP_GNU_implicit_pointer. */
+ sect_offset die;
+ /* The byte offset into the resulting data. */
+ LONGEST offset;
+ } ptr;
} v;
/* The length of the piece, in bits. */
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);
+void dwarf_expr_require_composition (const gdb_byte *, const gdb_byte *,
+ const char *);
-const gdb_byte *read_uleb128 (const gdb_byte *buf, const gdb_byte *buf_end,
- ULONGEST * r);
-const gdb_byte *read_sleb128 (const gdb_byte *buf, const gdb_byte *buf_end,
- LONGEST * r);
+/* 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,
+ const gdb_byte *buf_end,
+ CORE_ADDR *deref_size_return);
+
+int dwarf_block_to_fb_offset (const gdb_byte *buf, const gdb_byte *buf_end,
+ CORE_ADDR *fb_offset_return);
+
+int dwarf_block_to_sp_offset (struct gdbarch *gdbarch, const gdb_byte *buf,
+ const gdb_byte *buf_end,
+ CORE_ADDR *sp_offset_return);
+
+/* Wrappers around the leb128 reader routines to simplify them for our
+ purposes. */
+
+static inline const gdb_byte *
+gdb_read_uleb128 (const gdb_byte *buf, const gdb_byte *buf_end,
+ uint64_t *r)
+{
+ size_t bytes_read = read_uleb128_to_uint64 (buf, buf_end, r);
-const char *dwarf_stack_op_name (unsigned int, int);
+ if (bytes_read == 0)
+ return NULL;
+ return buf + bytes_read;
+}
-void dwarf_expr_require_composition (const gdb_byte *, const gdb_byte *,
- const char *);
+static inline const gdb_byte *
+gdb_read_sleb128 (const gdb_byte *buf, const gdb_byte *buf_end,
+ int64_t *r)
+{
+ size_t bytes_read = read_sleb128_to_int64 (buf, buf_end, r);
+
+ if (bytes_read == 0)
+ return NULL;
+ return buf + bytes_read;
+}
+
+static inline const gdb_byte *
+gdb_skip_leb128 (const gdb_byte *buf, const gdb_byte *buf_end)
+{
+ size_t bytes_read = skip_leb128 (buf, buf_end);
+
+ if (bytes_read == 0)
+ return NULL;
+ return buf + bytes_read;
+}
+
+extern const gdb_byte *safe_read_uleb128 (const gdb_byte *buf,
+ const gdb_byte *buf_end,
+ uint64_t *r);
+
+extern const gdb_byte *safe_read_sleb128 (const gdb_byte *buf,
+ const gdb_byte *buf_end,
+ int64_t *r);
+
+extern const gdb_byte *safe_skip_leb128 (const gdb_byte *buf,
+ const gdb_byte *buf_end);
#endif /* dwarf2expr.h */
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