-/* Dwarf2 location expression support for GDB.
- Copyright 2003 Free Software Foundation, Inc.
+/* DWARF 2 location expression support for GDB.
+
+ Copyright (C) 2003, 2005, 2007-2012 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#if !defined (DWARF2LOC_H)
#define DWARF2LOC_H
-struct symbol_ops;
+#include "dwarf2expr.h"
+
+struct symbol_computed_ops;
+struct objfile;
+struct dwarf2_per_cu_data;
+struct dwarf2_loclist_baton;
+struct agent_expr;
+struct axs_value;
/* This header is private to the DWARF-2 reader. It is shared between
dwarf2read.c and dwarf2loc.c. */
+/* `set debug entry-values' setting. */
+extern int entry_values_debug;
+
+/* Return the OBJFILE associated with the compilation unit CU. If CU
+ came from a separate debuginfo file, then the master objfile is
+ returned. */
+struct objfile *dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *cu);
+
+/* Return the address size given in the compilation unit header for CU. */
+int dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *cu);
+
+/* Return the DW_FORM_ref_addr size given in the compilation unit header for
+ CU. */
+int dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *cu);
+
+/* Return the offset size given in the compilation unit header for CU. */
+int dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *cu);
+
+/* Return the text offset of the CU. The returned offset comes from
+ this CU's objfile. If this objfile came from a separate debuginfo
+ file, then the offset may be different from the corresponding
+ offset in the parent objfile. */
+CORE_ADDR dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *cu);
+
+/* Find a particular location expression from a location list. */
+const gdb_byte *dwarf2_find_location_expression
+ (struct dwarf2_loclist_baton *baton,
+ size_t *locexpr_length,
+ CORE_ADDR pc);
+
+struct dwarf2_locexpr_baton dwarf2_fetch_die_location_block
+ (cu_offset offset_in_cu, struct dwarf2_per_cu_data *per_cu,
+ CORE_ADDR (*get_frame_pc) (void *baton),
+ void *baton);
+
+struct type *dwarf2_get_die_type (cu_offset die_offset,
+ struct dwarf2_per_cu_data *per_cu);
+
+/* Evaluate a location description, starting at DATA and with length
+ SIZE, to find the current location of variable of TYPE in the context
+ of FRAME. */
+
+struct value *dwarf2_evaluate_loc_desc (struct type *type,
+ struct frame_info *frame,
+ const gdb_byte *data,
+ unsigned short size,
+ struct dwarf2_per_cu_data *per_cu);
+
/* The symbol location baton types used by the DWARF-2 reader (i.e.
SYMBOL_LOCATION_BATON for a LOC_COMPUTED symbol). "struct
dwarf2_locexpr_baton" is for a symbol with a single location
struct dwarf2_locexpr_baton
{
- /* Pointer to the start of the location expression. */
- unsigned char *data;
+ /* Pointer to the start of the location expression. Valid only if SIZE is
+ not zero. */
+ const gdb_byte *data;
- /* Length of the location expression. */
- unsigned short size;
+ /* Length of the location expression. For optimized out expressions it is
+ zero. */
+ unsigned long size;
- /* The objfile containing the symbol whose location we're computing. */
- struct objfile *objfile;
+ /* The compilation unit containing the symbol whose location
+ we're computing. */
+ struct dwarf2_per_cu_data *per_cu;
};
struct dwarf2_loclist_baton
CORE_ADDR base_address;
/* Pointer to the start of the location list. */
- unsigned char *data;
+ const gdb_byte *data;
/* Length of the location list. */
- unsigned short size;
-
- /* The objfile containing the symbol whose location we're computing. */
- /* Used (only???) by thread local variables. The objfile in which
- this symbol is defined. To find a thread-local variable (e.g., a
- variable declared with the `__thread' storage class), we may need
- to know which object file it's in. */
- struct objfile *objfile;
-};
+ unsigned long size;
-extern const struct symbol_ops dwarf2_locexpr_funcs;
-extern const struct symbol_ops dwarf2_loclist_funcs;
+ /* The compilation unit containing the symbol whose location
+ we're computing. */
+ struct dwarf2_per_cu_data *per_cu;
+};
-#endif
+extern const struct symbol_computed_ops dwarf2_locexpr_funcs;
+extern const struct symbol_computed_ops dwarf2_loclist_funcs;
+
+/* Compile a DWARF location expression to an agent expression.
+
+ EXPR is the agent expression we are building.
+ LOC is the agent value we modify.
+ ARCH is the architecture.
+ ADDR_SIZE is the size of addresses, in bytes.
+ OP_PTR is the start of the location expression.
+ OP_END is one past the last byte of the location expression.
+
+ This will throw an exception for various kinds of errors -- for
+ example, if the expression cannot be compiled, or if the expression
+ is invalid. */
+
+extern void dwarf2_compile_expr_to_ax (struct agent_expr *expr,
+ struct axs_value *loc,
+ struct gdbarch *arch,
+ unsigned int addr_size,
+ const gdb_byte *op_ptr,
+ const gdb_byte *op_end,
+ struct dwarf2_per_cu_data *per_cu);
+
+/* Determined tail calls for constructing virtual tail call frames. */
+
+struct call_site_chain
+ {
+ /* Initially CALLERS == CALLEES == LENGTH. For partially ambiguous result
+ CALLERS + CALLEES < LENGTH. */
+ int callers, callees, length;
+
+ /* Variably sized array with LENGTH elements. Later [0..CALLERS-1] contain
+ top (GDB "prev") sites and [LENGTH-CALLEES..LENGTH-1] contain bottom
+ (GDB "next") sites. One is interested primarily in the PC field. */
+ struct call_site *call_site[1];
+ };
+
+struct call_site_stuff;
+extern struct call_site_chain *call_site_find_chain (struct gdbarch *gdbarch,
+ CORE_ADDR caller_pc,
+ CORE_ADDR callee_pc);
+
+#endif /* dwarf2loc.h */
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