/* 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>.
#if !defined (DWARF2EXPR_H)
#define DWARF2EXPR_H
-struct dwarf_expr_context;
-
-/* Offset relative to the start of its containing CU (compilation unit). */
-typedef struct
-{
- unsigned int cu_off;
-} cu_offset;
+#include "leb128.h"
+#include "gdbtypes.h"
-/* Offset relative to the start of its .debug_info or .debug_types section. */
-typedef struct
-{
- unsigned int sect_off;
-} sect_offset;
+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);
+ /* 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);
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
- DWARF_REG/FB_OFFSET at the caller of specified BATON. If DWARF register
- number DWARF_REG specifying the push_dwarf_reg_entry_value parameter is
- not -1 FB_OFFSET is ignored. Otherwise FB_OFFSET specifies stack
- parameter offset against caller's stack pointer (which equals the callee's
- frame base). If DEREF_SIZE is not -1 then use
- DW_AT_GNU_call_site_data_value instead of DW_AT_GNU_call_site_value. */
+ 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,
- int dwarf_reg, CORE_ADDR fb_offset,
+ 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
};
/* The location of a value. */
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
/* 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;
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;
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_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);
-
-const char *dwarf_stack_op_name (unsigned int);
-
void dwarf_expr_require_composition (const gdb_byte *, const gdb_byte *,
const char *);
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,
- int dwarf_reg, CORE_ADDR fb_offset,
+ 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);
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);
+
+ if (bytes_read == 0)
+ return NULL;
+ return buf + bytes_read;
+}
+
+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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