6885 CTF Everywhere Part 1

6886 Want ctfdiff
6887 ctfdump should be written in terms of libctf
6888 ctfmerge should be implemented in terms of libctf
6889 ctfconvert should be implemented in terms of libctf
6890 Want general workq
6891 Want general mergeq
6892 ctf_add_encoded assigns() incorrect byte size to types
6893 ctf_add_{struct,union,enum} can reuse forwards
6894 ctf_add_{struct,union,enum} occasionally forget to dirty the ctf_file_t
6895 ctf_add_member could better handle bitfields
6896 ctf_type_size() reports wrong size for forwards
6897 Want libctf ctf_kind_name() function
6898 Want libctf function to set struct/union size
Portions contributed by: John Levon <john.levon@joyent.com>
Portions contributed by: Richard Lowe <richlowe@richlowe.net>
Reviewed by: John Levon <john.levon@joyent.com>
Reviewed by: Andy Fiddaman <andy@omniosce.org>
Reviewed by: Gergő Doma <domag02@gmail.com>
Approved by: Dan McDonald <danmcd@joyent.com>

1 files changed, 337 insertions, 0 deletions

diff --git a/usr/src/lib/libdwarf/common/pro_arange.c b/usr/src/lib/libdwarf/common/pro_arange.c
new file mode 100644
index 0000000000..4e5c37795c
--- /dev/null
+++ b/usr/src/lib/libdwarf/common/pro_arange.c
@@ -0,0 +1,337 @@
+/*
+
+  Copyright (C) 2000,2004 Silicon Graphics, Inc.  All Rights Reserved.
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms of version 2.1 of the GNU Lesser General Public License 
+  as published by the Free Software Foundation.
+
+  This program is distributed in the hope that it would be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
+
+  Further, this software is distributed without any warranty that it is
+  free of the rightful claim of any third person regarding infringement 
+  or the like.  Any license provided herein, whether implied or 
+  otherwise, applies only to this software file.  Patent licenses, if
+  any, provided herein do not apply to combinations of this program with 
+  other software, or any other product whatsoever.  
+
+  You should have received a copy of the GNU Lesser General Public 
+  License along with this program; if not, write the Free Software 
+  Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston MA 02110-1301,
+  USA.
+
+  Contact information:  Silicon Graphics, Inc., 1500 Crittenden Lane,
+  Mountain View, CA 94043, or:
+
+  http://www.sgi.com
+
+  For further information regarding this notice, see:
+
+  http://oss.sgi.com/projects/GenInfo/NoticeExplan
+
+*/
+
+
+
+#include "config.h"
+#include "libdwarfdefs.h"
+#include <stdio.h>
+#include <string.h>
+#ifdef HAVE_ELFACCESS_H
+#include <elfaccess.h>
+#endif
+#include "pro_incl.h"
+#include "pro_arange.h"
+#include "pro_section.h"
+#include "pro_reloc.h"
+
+
+
+/*
+    This function adds another address range 
+    to the list of address ranges for the
+    given Dwarf_P_Debug.  It returns 0 on error,
+    and 1 otherwise.
+*/
+Dwarf_Unsigned
+dwarf_add_arange(Dwarf_P_Debug dbg,
+                 Dwarf_Addr begin_address,
+                 Dwarf_Unsigned length,
+                 Dwarf_Signed symbol_index, Dwarf_Error * error)
+{
+    return dwarf_add_arange_b(dbg, begin_address, length, symbol_index,
+                              /* end_symbol_index */ 0,
+                              /* offset_from_end_sym */ 0,
+                              error);
+}
+
+/*
+    This function adds another address range 
+    to the list of address ranges for the
+    given Dwarf_P_Debug.  It returns 0 on error,
+    and 1 otherwise.
+*/
+Dwarf_Unsigned
+dwarf_add_arange_b(Dwarf_P_Debug dbg,
+                   Dwarf_Addr begin_address,
+                   Dwarf_Unsigned length,
+                   Dwarf_Unsigned symbol_index,
+                   Dwarf_Unsigned end_symbol_index,
+                   Dwarf_Addr offset_from_end_sym, Dwarf_Error * error)
+{
+    Dwarf_P_Arange arange;
+
+    if (dbg == NULL) {
+        _dwarf_p_error(NULL, error, DW_DLE_DBG_NULL);
+        return (0);
+    }
+
+    arange = (Dwarf_P_Arange)
+        _dwarf_p_get_alloc(dbg, sizeof(struct Dwarf_P_Arange_s));
+    if (arange == NULL) {
+        _dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
+        return (0);
+    }
+
+    arange->ag_begin_address = begin_address;
+    arange->ag_length = length;
+    arange->ag_symbol_index = symbol_index;
+    arange->ag_end_symbol_index = end_symbol_index;
+    arange->ag_end_symbol_offset = offset_from_end_sym;
+
+    if (dbg->de_arange == NULL)
+        dbg->de_arange = dbg->de_last_arange = arange;
+    else {
+        dbg->de_last_arange->ag_next = arange;
+        dbg->de_last_arange = arange;
+    }
+    dbg->de_arange_count++;
+
+    return (1);
+}
+
+
+int
+_dwarf_transform_arange_to_disk(Dwarf_P_Debug dbg, Dwarf_Error * error)
+{
+    /* Total num of bytes in .debug_aranges section. */
+    Dwarf_Unsigned arange_num_bytes;
+
+    /* 
+       Adjustment to align the start of the actual address ranges on a
+       boundary aligned with twice the address size. */
+    Dwarf_Small remainder;
+
+    /* Total number of bytes excluding the length field. */
+    Dwarf_Unsigned adjusted_length;
+
+    /* Points to first byte of .debug_aranges buffer. */
+    Dwarf_Small *arange;
+
+    /* Fills in the .debug_aranges buffer. */
+    Dwarf_Small *arange_ptr;
+
+    /* Scans the list of address ranges provided by user. */
+    Dwarf_P_Arange given_arange;
+
+    /* Used to fill in 0. */
+    const Dwarf_Signed big_zero = 0;
+
+    int extension_word_size = dbg->de_64bit_extension ? 4 : 0;
+    int uword_size = dbg->de_offset_size;
+    int upointer_size = dbg->de_pointer_size;
+    int res;
+
+
+    /* ***** BEGIN CODE ***** */
+
+    /* Size of the .debug_aranges section header. */
+    arange_num_bytes = extension_word_size + uword_size +       /* Size 
+                                                                   of
+                                                                   length 
+                                                                   field. 
+                                                                 */
+        sizeof(Dwarf_Half) +    /* Size of version field. */
+        uword_size +            /* Size of .debug_info offset. */
+        sizeof(Dwarf_Small) +   /* Size of address size field. */
+        sizeof(Dwarf_Small);    /* Size of segment size field. */
+
+    /* 
+       Adjust the size so that the set of aranges begins on a boundary
+       that aligned with twice the address size.  This is a Libdwarf
+       requirement. */
+    remainder = arange_num_bytes % (2 * upointer_size);
+    if (remainder != 0)
+        arange_num_bytes += (2 * upointer_size) - remainder;
+
+
+    /* Add the bytes for the actual address ranges. */
+    arange_num_bytes += upointer_size * 2 * (dbg->de_arange_count + 1);
+
+    GET_CHUNK(dbg, dbg->de_elf_sects[DEBUG_ARANGES],
+              arange, (unsigned long) arange_num_bytes, error);
+    arange_ptr = arange;
+    if (arange == NULL) {
+        _dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
+        return (0);
+    }
+    if (extension_word_size) {
+        Dwarf_Word x = DISTINGUISHED_VALUE;
+
+        WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+                        (const void *) &x,
+                        sizeof(x), extension_word_size);
+        arange_ptr += extension_word_size;
+    }
+
+    /* Write the total length of .debug_aranges section. */
+    adjusted_length = arange_num_bytes - uword_size
+        - extension_word_size;
+    {
+        Dwarf_Unsigned du = adjusted_length;
+
+        WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+                        (const void *) &du, sizeof(du), uword_size);
+        arange_ptr += uword_size;
+    }
+
+    /* Write the version as 2 bytes. */
+    {
+        Dwarf_Half verstamp = CURRENT_VERSION_STAMP;
+
+        WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+                        (const void *) &verstamp,
+                        sizeof(verstamp), sizeof(Dwarf_Half));
+        arange_ptr += sizeof(Dwarf_Half);
+    }
+
+
+    /* Write the .debug_info offset.  This is always 0. */
+    WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+                    (const void *) &big_zero,
+                    sizeof(big_zero), uword_size);
+    arange_ptr += uword_size;
+
+    {
+        unsigned long count = dbg->de_arange_count + 1;
+        int res;
+
+        if (dbg->de_reloc_pair) {
+            count = (3 * dbg->de_arange_count) + 1;
+        }
+        /* the following is a small optimization: not needed for
+           correctness */
+        res = _dwarf_pro_pre_alloc_n_reloc_slots(dbg,
+                                                 DEBUG_ARANGES, count);
+        if (res != DW_DLV_OK) {
+            {
+                _dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
+                return (0);
+            }
+        }
+    }
+
+    /* reloc for .debug_info */
+    res = dbg->de_reloc_name(dbg,
+                             DEBUG_ARANGES,
+                             extension_word_size +
+                             uword_size + sizeof(Dwarf_Half),
+                             dbg->de_sect_name_idx[DEBUG_INFO],
+                             dwarf_drt_data_reloc, uword_size);
+
+    /* Write the size of addresses. */
+    *arange_ptr = dbg->de_pointer_size;
+    arange_ptr++;
+
+    /* 
+       Write the size of segment addresses. This is zero for MIPS
+       architectures. */
+    *arange_ptr = 0;
+    arange_ptr++;
+
+    /* 
+       Skip over the padding to align the start of the actual address
+       ranges to twice the address size. */
+    if (remainder != 0)
+        arange_ptr += (2 * upointer_size) - remainder;
+
+
+
+
+
+    /* The arange address, length are pointer-size fields of the target 
+       machine. */
+    for (given_arange = dbg->de_arange; given_arange != NULL;
+         given_arange = given_arange->ag_next) {
+
+        /* Write relocation record for beginning of address range. */
+        res = dbg->de_reloc_name(dbg, DEBUG_ARANGES, arange_ptr - arange,       /* r_offset 
+                                                                                 */
+                                 (long) given_arange->ag_symbol_index,
+                                 dwarf_drt_data_reloc, upointer_size);
+        if (res != DW_DLV_OK) {
+            {
+                _dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
+                return (0);
+            }
+        }
+
+        /* Copy beginning address of range. */
+        WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+                        (const void *) &given_arange->ag_begin_address,
+                        sizeof(given_arange->ag_begin_address),
+                        upointer_size);
+        arange_ptr += upointer_size;
+
+        if (dbg->de_reloc_pair &&
+            given_arange->ag_end_symbol_index != 0 &&
+            given_arange->ag_length == 0) {
+            /* symbolic reloc, need reloc for length What if we really
+               know the length? If so, should use the other part of
+               'if'. */
+            Dwarf_Unsigned val;
+
+            res = dbg->de_reloc_pair(dbg, DEBUG_ARANGES, arange_ptr - arange,   /* r_offset 
+                                                                                 */
+                                     given_arange->ag_symbol_index,
+                                     given_arange->ag_end_symbol_index,
+                                     dwarf_drt_first_of_length_pair,
+                                     upointer_size);
+            if (res != DW_DLV_OK) {
+                {
+                    _dwarf_p_error(dbg, error, DW_DLE_ALLOC_FAIL);
+                    return (0);
+                }
+            }
+
+            /* arrange pre-calc so assem text can do .word end - begin
+               + val (gets val from stream) */
+            val = given_arange->ag_end_symbol_offset -
+                given_arange->ag_begin_address;
+            WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+                            (const void *) &val,
+                            sizeof(val), upointer_size);
+            arange_ptr += upointer_size;
+
+        } else {
+            /* plain old length to copy, no relocation at all */
+            WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+                            (const void *) &given_arange->ag_length,
+                            sizeof(given_arange->ag_length),
+                            upointer_size);
+            arange_ptr += upointer_size;
+        }
+    }
+
+    WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+                    (const void *) &big_zero,
+                    sizeof(big_zero), upointer_size);
+
+    arange_ptr += upointer_size;
+    WRITE_UNALIGNED(dbg, (void *) arange_ptr,
+                    (const void *) &big_zero,
+                    sizeof(big_zero), upointer_size);
+    return (int) dbg->de_n_debug_sect;
+}