/* DWARF 2 Expression Evaluator.
- Copyright (C) 2001, 2002, 2003, 2005, 2007, 2008, 2009, 2010, 2011
- Free Software Foundation, Inc.
+ Copyright (C) 2001-2003, 2005, 2007-2012 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;
+
+/* 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
+ 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. */
+ void (*push_dwarf_reg_entry_value) (struct dwarf_expr_context *ctx,
+ int dwarf_reg, CORE_ADDR fb_offset,
+ 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. */
enum dwarf_value_location
{
/* Target address size in bytes. */
int addr_size;
+ /* 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 argument. */
CORE_ADDR offset;
- /* The evaluator is value-based, and frees values up to this point
- when the expression context is destroyed. */
- struct value *mark;
-
/* 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 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
+ /* 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
/* 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. */
+ target DIE of cu_offset kind. */
ULONGEST len;
const gdb_byte *data;
struct
{
/* The referent DIE from DW_OP_GNU_implicit_pointer. */
- ULONGEST die;
+ cu_offset die;
/* The byte offset into the resulting data. */
LONGEST offset;
} ptr;
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 *);
+/* 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,
+ int dwarf_reg, CORE_ADDR fb_offset,
+ 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);
+
#endif /* dwarf2expr.h */
projects / deliverable / binutils-gdb.git / blobdiff