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4c2df51b DJ |
1 | /* Dwarf2 Expression Evaluator |
2 | Copyright 2001, 2002, 2003 Free Software Foundation, Inc. | |
3 | Contributed by Daniel Berlin (dan@dberlin.org) | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #if !defined (DWARF2EXPR_H) | |
22 | #define DWARF2EXPR_H | |
23 | ||
24 | /* The expression evaluator works with a dwarf_expr_context, describing | |
25 | its current state and its callbacks. */ | |
26 | struct dwarf_expr_context | |
27 | { | |
28 | /* The stack of values, allocated with xmalloc. */ | |
29 | CORE_ADDR *stack; | |
30 | ||
31 | /* The number of values currently pushed on the stack, and the | |
32 | number of elements allocated to the stack. */ | |
33 | int stack_len, stack_allocated; | |
34 | ||
35 | /* An opaque argument provided by the caller, which will be passed | |
36 | to all of the callback functions. */ | |
37 | void *baton; | |
38 | ||
39 | /* Return the value of register number REGNUM. LVALP will be set | |
40 | to the kind of lval this register is (generally lval_register | |
41 | for the current frame's registers or lval_memory for a register | |
42 | saved to the stack). For lval_memory ADDRP will be set to the | |
43 | saved location of the register. */ | |
44 | CORE_ADDR (*read_reg) (void *baton, int regnum, enum lval_type *lvalp, | |
45 | CORE_ADDR *addrp); | |
46 | ||
47 | /* Read LENGTH bytes at ADDR into BUF. */ | |
48 | void (*read_mem) (void *baton, char *buf, CORE_ADDR addr, | |
49 | size_t length); | |
50 | ||
51 | /* Return the location expression for the frame base attribute, in | |
52 | START and LENGTH. The result must be live until the current | |
53 | expression evaluation is complete. */ | |
54 | void (*get_frame_base) (void *baton, unsigned char **start, | |
55 | size_t *length); | |
56 | ||
57 | /* Return the thread-local storage address for | |
58 | DW_OP_GNU_push_tls_address. */ | |
59 | CORE_ADDR (*get_tls_address) (void *baton, CORE_ADDR offset); | |
60 | ||
61 | #if 0 | |
62 | /* Not yet implemented. */ | |
63 | ||
64 | /* Return the location expression for the dwarf expression | |
65 | subroutine in the die at OFFSET in the current compilation unit. | |
66 | The result must be live until the current expression evaluation | |
67 | is complete. */ | |
68 | unsigned char *(*get_subr) (void *baton, off_t offset, size_t *length); | |
69 | ||
70 | /* Return the `object address' for DW_OP_push_object_address. */ | |
71 | CORE_ADDR (*get_object_address) (void *baton); | |
72 | #endif | |
73 | ||
74 | /* The current depth of dwarf expression recursion, via DW_OP_call*, | |
75 | DW_OP_fbreg, DW_OP_push_object_address, etc., and the maximum | |
76 | depth we'll tolerate before raising an error. */ | |
77 | int recursion_depth, max_recursion_depth; | |
78 | ||
79 | /* Non-zero if the result is in a register. The register number | |
80 | will be in REGNUM, and the result will be the contents of the | |
81 | register. */ | |
82 | int in_reg; | |
83 | ||
84 | /* If the result is in a register, the register number. */ | |
85 | int regnum; | |
86 | }; | |
87 | ||
88 | struct dwarf_expr_context *new_dwarf_expr_context (); | |
89 | void free_dwarf_expr_context (struct dwarf_expr_context *ctx); | |
90 | ||
91 | void dwarf_expr_push (struct dwarf_expr_context *ctx, CORE_ADDR value); | |
92 | void dwarf_expr_pop (struct dwarf_expr_context *ctx); | |
93 | void dwarf_expr_eval (struct dwarf_expr_context *ctx, unsigned char *addr, | |
94 | size_t len); | |
95 | CORE_ADDR dwarf_expr_fetch (struct dwarf_expr_context *ctx, int n); | |
96 | ||
a55cc764 DJ |
97 | |
98 | unsigned char *read_uleb128 (unsigned char *buf, unsigned char *buf_end, | |
99 | ULONGEST * r); | |
100 | unsigned char *read_sleb128 (unsigned char *buf, unsigned char *buf_end, | |
101 | LONGEST * r); | |
102 | ||
4c2df51b | 103 | #endif |