/*

  Copyright (C) 2015-2022 David Anderson. 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.

*/

#include <config.h>

#include <stdlib.h> /* calloc() free() malloc() */

#include <string.h> /* memset() strcat() strlen() */

#if defined(_WIN32) && defined(HAVE_STDAFX_H)

#include "stdafx.h"

#endif /* HAVE_STDAFX_H */

#include "dwarf.h"

#include "libdwarf.h"

#include "libdwarf_private.h"

#include "dwarf_base_types.h"

#include "dwarf_safe_strcpy.h"

#include "dwarf_opaque.h"

#include "dwarf_alloc.h"

#include "dwarf_error.h"

#include "dwarf_util.h"

#include "dwarf_macro5.h"

#include "dwarf_string.h"

#include "dwarf_str_offsets.h"

#define MC_SENTINEL  0xada

#define CHECKNULLCONTEXT(m,d,e)             \

if (!(m) || (m)->mc_sentinel != MC_SENTINEL) {  \

    if (m) { (d) = (m)->mc_dbg;  }            \

    _dwarf_error_string((d), (e),               \

        DW_DLE_BAD_MACRO_HEADER_POINTER,    \

        "DW_DLE_BAD_MACRO_HEADER_POINTER "  \

        " NULL header or corrupt header");    \

    return DW_DLV_ERROR;                    \

}

/*  Section 6.3: Macro Information:

    Each macro unit ends with an entry

    containing an opcode of 0. */

static const Dwarf_Small dwarf_udata_string_form[] =

    {DW_FORM_udata,DW_FORM_string};

static const Dwarf_Small dwarf_udata_udata_form[]  =

    {DW_FORM_udata,DW_FORM_udata};

static const Dwarf_Small dwarf_udata_strp_form[]   =

    {DW_FORM_udata,DW_FORM_strp};

static const Dwarf_Small dwarf_udata_strp_sup_form[] =

    {DW_FORM_udata,DW_FORM_strp_sup};

static const Dwarf_Small dwarf_secoffset_form[]    =

    {DW_FORM_sec_offset};

static const Dwarf_Small dwarf_udata_strx_form[]   =

    {DW_FORM_udata,DW_FORM_strx};

struct Dwarf_Macro_Forms_s dw5formsarray[] = {

    {0,0,0},

    {DW_MACRO_define,2,dwarf_udata_string_form},

    {DW_MACRO_undef,2,dwarf_udata_string_form},

    {DW_MACRO_start_file,2,dwarf_udata_udata_form},

    {DW_MACRO_end_file,0,0},

    {DW_MACRO_define_strp,2,dwarf_udata_strp_form},

    {DW_MACRO_undef_strp,2,dwarf_udata_strp_form},

    {DW_MACRO_import,1,dwarf_secoffset_form},

    {DW_MACRO_define_sup,2,dwarf_udata_strp_sup_form},

    {DW_MACRO_undef_sup,2,dwarf_udata_strp_sup_form},

    {DW_MACRO_import_sup,1,dwarf_secoffset_form},

    {DW_MACRO_define_strx,2,dwarf_udata_strx_form},

    {DW_MACRO_undef_strx,2,dwarf_udata_strx_form},

};

/* Represents DWARF 5 macro info */

/* .debug_macro predefined, in order by value  */

static const struct Dwarf_Macro_OperationsList_s

    dwarf_default_macro_opslist = {

13, dw5formsarray

};

static int _dwarf_internal_macro_context_by_offset(Dwarf_Debug dbg,

    Dwarf_Unsigned offset,

    Dwarf_Unsigned  * version_out,

    Dwarf_Macro_Context * macro_context_out,

    Dwarf_Unsigned *macro_ops_count_out,

    Dwarf_Unsigned *macro_ops_data_length,

    char **srcfiles,

    Dwarf_Signed srcfilescount,

    const char *comp_dir,

    const char *comp_name,

    Dwarf_CU_Context cu_context,

    Dwarf_Error * error);

static int _dwarf_internal_macro_context(Dwarf_Die die,

    Dwarf_Bool offset_specified,

    Dwarf_Unsigned offset,

    Dwarf_Unsigned  * version_out,

    Dwarf_Macro_Context * macro_context_out,

    Dwarf_Unsigned *macro_unit_offset_out,

    Dwarf_Unsigned *macro_ops_count_out,

    Dwarf_Unsigned *macro_ops_data_length,

    Dwarf_Error * error);

static int

is_std_moperator(Dwarf_Small op)

{

    if (op >= 1 && op <= DW_MACRO_undef_strx) {

        return TRUE;

    }

    return FALSE;

}

static int

_dwarf_skim_forms(Dwarf_Debug dbg,

    Dwarf_Macro_Context mcontext,

    Dwarf_Small *mdata_start,

    unsigned formcount,

    const Dwarf_Small *forms,

    Dwarf_Small *section_end,

    Dwarf_Unsigned *forms_length,

    Dwarf_Error *error)

{

    unsigned i = 0;

    Dwarf_Small curform = 0 ;

    Dwarf_Unsigned totallen = 0;

    Dwarf_Unsigned v = 0;

    Dwarf_Unsigned ret_value = 0;

    Dwarf_Unsigned length;

    Dwarf_Small *mdata = mdata_start;

    Dwarf_Unsigned leb128_length = 0;

    for ( ; i < formcount; ++i) {

        curform = forms[i];

        if (mdata >= section_end) {

            _dwarf_error(dbg, error, DW_DLE_MACRO_OFFSET_BAD);

            return DW_DLV_ERROR;

        }

        switch(curform) {

        default:

            _dwarf_error(dbg,error,

                DW_DLE_DEBUG_FORM_HANDLING_INCOMPLETE);

            return DW_DLV_ERROR;

        case DW_FORM_block1:

            v =  *(Dwarf_Small *) mdata;

            totallen += v+1;

            mdata += v+1;

            break;

        case DW_FORM_block2:

            READ_UNALIGNED_CK(dbg, ret_value, Dwarf_Unsigned,

                mdata, DWARF_HALF_SIZE,

                error,section_end);

            v = ret_value + DWARF_HALF_SIZE;

            totallen += v;

            mdata += v;

            break;

        case DW_FORM_block4:

            READ_UNALIGNED_CK(dbg, ret_value, Dwarf_Unsigned,

                mdata, DWARF_32BIT_SIZE,

                error,section_end);

            v = ret_value + DWARF_32BIT_SIZE;

            totallen += v;

            mdata += v;

            break;

        case DW_FORM_data1:

            v = 1;

            totallen += v;

            mdata += v;

            break;

        case DW_FORM_data2:

            v = 2;

            totallen += v;

            mdata += v;

            break;

        case DW_FORM_data4:

            v = 4;

            totallen += v;

            mdata += v;

            break;

        case DW_FORM_data8:

            v = 8;

            totallen += v;

            mdata += v;

            break;

        case DW_FORM_data16:

            v = 8;

            totallen += v;

            mdata += v;

            break;

        case DW_FORM_string: {

            int res = _dwarf_check_string_valid(dbg,

                mdata,mdata, section_end,

                DW_DLE_MACRO_STRING_BAD,error);

            if (res != DW_DLV_OK) {

                return res;

            }

            v = strlen((char *) mdata) + 1;

            totallen += v;

            mdata    += v;

            }

            break;

        case DW_FORM_block:

            DECODE_LEB128_UWORD_LEN_CK(mdata,length,leb128_length,

                dbg, error,section_end);

            v = length + leb128_length;

            totallen += v;

            break;

        case DW_FORM_flag:

            v = 1;

            totallen += v;

            mdata += v;

            break;

        case DW_FORM_sec_offset:

            /* If 32bit dwarf, is 4. Else is 64bit dwarf and is 8. */

            v = mcontext->mc_offset_size;

            totallen += v;

            mdata += v;

            break;

        case DW_FORM_sdata:

            /*  Discard the decoded value, we just want the length

                of the value. */

            DECODE_LEB128_UWORD_LEN_CK(mdata,length,leb128_length,

                dbg, error,section_end);

            totallen += v;

            break;

        case DW_FORM_strx:

            DECODE_LEB128_UWORD_LEN_CK(mdata,length,leb128_length,

                dbg, error,section_end);

            totallen += leb128_length;;

            break;

        case DW_FORM_strp:

            v = mcontext->mc_offset_size;

            mdata += v;

            totallen += v;

            break;

        case DW_FORM_udata:

            /*  Discard the decoded value, we just want the length

                of the value. */

            DECODE_LEB128_UWORD_LEN_CK(mdata,length,leb128_length,

                dbg, error,section_end);

            totallen += leb128_length;

            break;

        }

    }

    if (mdata > section_end) {

        _dwarf_error(dbg, error, DW_DLE_MACRO_OFFSET_BAD);

        return DW_DLV_ERROR;

    }

    *forms_length = totallen;

    return DW_DLV_OK;

}

#if 0 /* FOR DEBUGGING */

static void

dump_bytes_x(Dwarf_Small * start, long len)

{

    Dwarf_Small *end = start + len;

    Dwarf_Small *cur = start;

    unsigned pos = 0;

    printf("dump %ld bytes, start at 0x%lx\n",

        len,(unsigned long)start);

    printf("0x");

    for (; cur < end;pos++, cur++) {

        if (!(pos %4)) {

            printf(" ");

        }

        printf("%02x",*cur);

    }

    printf("\n");

}

Dwarf_Bool

is_defundef(unsigned op)

{

    switch(op){

    case DW_MACRO_define:

    case DW_MACRO_undef:

    case DW_MACRO_define_strp:

    case DW_MACRO_undef_strp:

    case DW_MACRO_define_strx:

    case DW_MACRO_undef_strx:

    case DW_MACRO_define_sup:

    case DW_MACRO_undef_sup:

        return TRUE;

    default: break;

    }

    return FALSE;

}

#endif /*0*/

/*  On first call (for this macro_context),

    build_ops_array is FALSE. On second,

    it is TRUE and we know the count so we allocate and fill in

    the ops array. */

static int

_dwarf_get_macro_ops_count_internal(Dwarf_Macro_Context macro_context,

    Dwarf_Bool build_ops_array,

    Dwarf_Error *error)

{

    Dwarf_Debug dbg = 0;

    Dwarf_Small *mdata = 0;

    Dwarf_Small *section_end = 0;

    Dwarf_Small *section_base = 0;

    Dwarf_Unsigned opcount = 0;

    Dwarf_Unsigned known_ops_count = 0;

    struct Dwarf_Macro_Operator_s *opsarray = 0;

    struct Dwarf_Macro_Operator_s *curopsentry = 0;

    int res = 0;

    dbg = macro_context->mc_dbg;

    if (build_ops_array) {

        known_ops_count = macro_context->mc_macro_ops_count;

        opsarray = (struct Dwarf_Macro_Operator_s *)

            calloc(known_ops_count,

                sizeof(struct Dwarf_Macro_Operator_s));

        if (!opsarray) {

            _dwarf_error(dbg, error, DW_DLE_ALLOC_FAIL);

            return DW_DLV_ERROR;

        }

        curopsentry = opsarray;

        macro_context->mc_ops = opsarray;

    }

    section_base = dbg->de_debug_macro.dss_data;

    section_end = section_base + dbg->de_debug_macro.dss_size;

    mdata = macro_context->mc_macro_ops;

    while (mdata < section_end) {

        Dwarf_Small op = 0;

        op = *mdata;

        ++opcount;

        ++mdata;

        if (!op) {

            Dwarf_Unsigned opslen = 0;

            /*  End of ops, this is terminator, count the ending 0

                as an operator so dwarfdump can print it.

                Normally we don't see this, the end operator

                signals end. */

            opslen = mdata - macro_context->mc_macro_ops;

            macro_context->mc_macro_ops_count = opcount;

            macro_context->mc_ops_data_length = opslen;

            macro_context->mc_total_length = opslen +

                macro_context->mc_macro_header_length;

            if (build_ops_array) {

                curopsentry->mo_opcode = op;

                curopsentry->mo_form = 0;

                curopsentry->mo_data = 0;

            }

            return DW_DLV_OK;

        }

        if (is_std_moperator(op)) {

            struct Dwarf_Macro_Forms_s * ourform =

                dw5formsarray + op;

            /* ASSERT: op == ourform->mf_code */

            unsigned formcount = ourform->mf_formcount;

            const Dwarf_Small *forms = ourform->mf_formbytes;

            Dwarf_Unsigned forms_length = 0;

            res = _dwarf_skim_forms(dbg,macro_context,mdata,

                formcount,forms,

                section_end,

                &forms_length,error);

            if ( res != DW_DLV_OK) {

                return res;

            }

            if (build_ops_array) {

                curopsentry->mo_opcode = op;

                curopsentry->mo_form = ourform;

                curopsentry->mo_data = mdata;

            }

            mdata += forms_length;

        } else {

            /* FIXME Add support for user defined ops. */

            _dwarf_error(dbg, error, DW_DLE_MACRO_OP_UNHANDLED);

            return DW_DLV_ERROR;

        }

        if (mdata > section_end)  {

            _dwarf_error(dbg, error, DW_DLE_MACRO_PAST_END);

            return DW_DLV_ERROR;

        }

        if (build_ops_array) {

            curopsentry++;

        }

    }

    _dwarf_error(dbg, error, DW_DLE_MACRO_PAST_END);

    return DW_DLV_ERROR;

}

int

dwarf_get_macro_op(Dwarf_Macro_Context macro_context,

    Dwarf_Unsigned op_number,

    Dwarf_Unsigned * op_start_section_offset,

    Dwarf_Half    * macro_operator,

    Dwarf_Half    * forms_count,

    const Dwarf_Small **   formcode_array,

    Dwarf_Error *error)

{

    struct Dwarf_Macro_Operator_s *curop = 0;

    Dwarf_Debug dbg = 0;

    Dwarf_Unsigned op_offset = 0;

    Dwarf_Half operator = 0;

    CHECKNULLCONTEXT(macro_context,dbg,error);

    dbg = macro_context->mc_dbg;

    if (op_number >= macro_context->mc_macro_ops_count) {

        _dwarf_error(dbg, error,DW_DLE_BAD_MACRO_INDEX);

        return DW_DLV_ERROR;

    }

    curop = macro_context->mc_ops + op_number;

    operator = curop->mo_opcode;

    if (!operator) {

        /*  For the null byte at the end

            of an operator list.  */

        *op_start_section_offset = macro_context->mc_total_length+

            macro_context->mc_section_offset -1;

        *macro_operator = operator;

        *forms_count  = 0;

        *formcode_array = 0;

        return DW_DLV_OK;

    }

    op_offset =

        ((curop->mo_data -1) - macro_context->mc_macro_header) +

        macro_context->mc_section_offset;

    if (op_offset >= macro_context->mc_section_size) {

        dwarfstring m;

        char buf[50];

        dwarfstring_constructor_static(&m,buf,sizeof(buf));

        dwarfstring_append_printf_u(&m,

            "DW_DLE_MACRO_OFFSET_BAD: offset 0x%lx",

            op_offset);

        dwarfstring_append_printf_u(&m,

            " >= section size of 0x%lx",

            macro_context->mc_section_size);

        _dwarf_error_string(dbg,error,DW_DLE_MACRO_OFFSET_BAD,

            dwarfstring_string(&m));

        dwarfstring_destructor(&m);

        return DW_DLV_ERROR;

    }

    *op_start_section_offset = op_offset;

    *macro_operator = operator;

    if (curop->mo_form) {

        *forms_count  = curop->mo_form->mf_formcount;

        *formcode_array = curop->mo_form->mf_formbytes;

    } else {

        /* ASSERT: macro_operator == 0 */

        *forms_count  = 0;

        *formcode_array = 0;

    }

    return DW_DLV_OK;

}

/*  Here a DW_DLV_NO_ENTRY return means the macro operator

    is not a def/undef operator. */

int

dwarf_get_macro_defundef(Dwarf_Macro_Context macro_context,

    Dwarf_Unsigned op_number,

    Dwarf_Unsigned * line_number,

    Dwarf_Unsigned * index,

    Dwarf_Unsigned * offset,

    Dwarf_Half     * forms_count,

    const char     ** macro_string,

    Dwarf_Error *error)

{

    Dwarf_Debug dbg = 0;

    Dwarf_Small *mdata = 0;

    int res = 0;

    Dwarf_Small *startptr = 0;

    Dwarf_Small *endptr = 0;

    Dwarf_Half lformscount = 0;

    struct Dwarf_Macro_Operator_s *curop = 0;

    unsigned macop = 0;

    CHECKNULLCONTEXT(macro_context,dbg,error);

    dbg = macro_context->mc_dbg;

    if (op_number >= macro_context->mc_macro_ops_count) {

        _dwarf_error(dbg, error,DW_DLE_BAD_MACRO_INDEX);

        return DW_DLV_ERROR;

    }

    curop = macro_context->mc_ops + op_number;

    macop = curop->mo_opcode;

    startptr = macro_context->mc_macro_header;

    endptr = startptr + macro_context->mc_total_length;

    mdata = curop->mo_data;

    lformscount = curop->mo_form->mf_formcount;

    if (lformscount != 2) {

        /*_dwarf_error(dbg, error,DW_DLE_MACRO_OPCODE_FORM_BAD);*/

        return DW_DLV_NO_ENTRY;

    }

    switch(macop){

    case DW_MACRO_define:

    case DW_MACRO_undef: {

        Dwarf_Unsigned linenum = 0;

        const char * content = 0;

        DECODE_LEB128_UWORD_CK(mdata,linenum,

            dbg, error,endptr);

        content = (const char *)mdata;

        res = _dwarf_check_string_valid(dbg,

            startptr,mdata, endptr,

            DW_DLE_MACRO_STRING_BAD,error);

        if (res != DW_DLV_OK) {

            return res;

        }

        *line_number = linenum;

        *index = 0;

        *offset = 0;

        *forms_count = lformscount;

        *macro_string = content;

        }

        return DW_DLV_OK;

    case DW_MACRO_define_strp:

    case DW_MACRO_undef_strp: {

        Dwarf_Unsigned linenum = 0;

        Dwarf_Unsigned stringoffset = 0;

        Dwarf_Small form1 =  curop->mo_form->mf_formbytes[1];

        char * localstr = 0;

        DECODE_LEB128_UWORD_CK(mdata,linenum,

            dbg, error,endptr);

        READ_UNALIGNED_CK(dbg,stringoffset,Dwarf_Unsigned,

            mdata,macro_context->mc_offset_size,

            error,endptr);

        res = _dwarf_extract_local_debug_str_string_given_offset(dbg,

            form1,

            stringoffset,

            &localstr,

            error);

        *index = 0;

        *line_number = linenum;

        *offset = stringoffset;

        *forms_count = lformscount;

        if (res == DW_DLV_ERROR) {

            *macro_string = "<Error: getting local .debug_str>";

            return res;

        } else if (res == DW_DLV_NO_ENTRY) {

            *macro_string = "<Error: NO_ENTRY on "

                ".debug_string (strp)>";

        } else {

            *macro_string = (const char *)localstr;

        }

        }

        return DW_DLV_OK;

    case DW_MACRO_define_strx:

    case DW_MACRO_undef_strx: {

        Dwarf_Unsigned linenum = 0;

        Dwarf_Unsigned stringindex = 0;

        Dwarf_Unsigned offsettostr= 0;

        int ress = 0;

        Dwarf_Byte_Ptr mdata_copy = 0;

        Dwarf_Small form1 =  curop->mo_form->mf_formbytes[1];

        DECODE_LEB128_UWORD_CK(mdata,linenum, dbg, error,endptr);

        *line_number = linenum;

        mdata_copy = mdata;

        DECODE_LEB128_UWORD_CK(mdata_copy,stringindex,

            dbg, error,endptr);

        /* mdata_copy is for call below */

        *index = stringindex;

        *forms_count = lformscount;

        /* Redoes the index-getting. Gets offset. */

        ress = _dwarf_extract_string_offset_via_str_offsets(dbg,

            mdata_copy,

            endptr,

            form1,

            macro_context->mc_cu_context,

            &offsettostr,

            error);

        if (ress  == DW_DLV_ERROR) {

            return ress;

        }

        if (ress == DW_DLV_OK) {

            char *localstr = 0;

            *index = stringindex;

            *offset = offsettostr;

            ress =

                _dwarf_extract_local_debug_str_string_given_offset(

                dbg,

                form1,

                offsettostr,

                &localstr,

                error);

            if (ress == DW_DLV_ERROR) {

                return ress;

            } else if (ress == DW_DLV_NO_ENTRY){

                *macro_string = "<:No string available>";

            } else {

                *macro_string = (const char *)localstr;

                /* All is ok. */

            }

        } else {

            *index = stringindex;

            *offset = 0;

            *macro_string = "<.debug_str_offsets not available>";

        }

        }

        return DW_DLV_OK;

    case DW_MACRO_define_sup:

    case DW_MACRO_undef_sup: {

        Dwarf_Unsigned linenum = 0;

        Dwarf_Unsigned supoffset = 0;

        char *localstring = 0;

        int resup = 0;

        Dwarf_Error lerr = 0;

        DECODE_LEB128_UWORD_CK(mdata,linenum,

            dbg, error,endptr);

        READ_UNALIGNED_CK(dbg,supoffset,Dwarf_Unsigned,

            mdata,macro_context->mc_offset_size,

            error,endptr);

        *line_number = linenum;

        *index = 0;

        *offset = supoffset;

        *forms_count = lformscount;

        resup = _dwarf_get_string_from_tied(dbg, supoffset,

            &localstring, &lerr);

        if (resup != DW_DLV_OK) {

            if (resup == DW_DLV_ERROR) {

                int myerrno = dwarf_errno(lerr);

                if (myerrno == DW_DLE_NO_TIED_FILE_AVAILABLE) {

                    *macro_string =

                        (char *)"<DW_FORM_str_sup-no-tied_file>";

                } else {

                    _dwarf_error(dbg,error,myerrno);

                    *macro_string =

                        (char *)"<Error: DW_FORM_str_sup-got-error>";

                }

                dwarf_dealloc(dbg,lerr,DW_DLA_ERROR);

            } else {

                *macro_string = "<DW_FORM_str_sup-no-entry>";

            }

            return resup;

        }

        *macro_string = (const char *)localstring;

        /*  If NO ENTRY available, return DW_DLV_NO_ENTRY.

            We suspect this is better than DW_DLV_OK.  */

        return resup;

        }

    default:

        _dwarf_error(dbg,error,DW_DLE_MACRO_OP_UNHANDLED);

        return DW_DLV_ERROR;

    }

    return DW_DLV_NO_ENTRY;

}

/*  ASSERT: we elsewhere guarantee room to copy into.

    If trimtarg ==1, trim trailing slash in targ.

    Caller should not pass in 'src'

    with leading /  */

static void

specialcat(char *targ,char *src,int trimtarg)

{

    char *last = 0;

    while( *targ) {

        last = targ;

        targ++;

    }

    /* TARG now points at terminating NUL */

    /* LAST points at final character in targ. */

    if (trimtarg ) {

        if (last && *last == '/') {

            /* Truncate. */

            *last = 0;

            targ = last;

            /* TARG again points at terminating NUL */

        }

    }

    while (*src) {

        *targ = *src;

        targ++;

        src++;

    }

    *targ = 0;

}

/* If returns NULL caller must handle it. */

static const char *

construct_from_dir_and_name(const char *dir,

    const char *name)

{

    size_t truelen = 0;

    char  *final   = 0;

    /* Allow for NUL char and added /  */

    truelen = strlen(dir) + strlen(name) + 1 +1;

    final = (char *)malloc(truelen);

    if (!final) {

        return NULL;

    }

    final[0] = 0;

    specialcat(final,(char *)dir,1);

    strcat(final,"/");

    specialcat(final,(char *)name,0);

    return final;

}

/* If returns NULL caller must handle it. */

static const char *

construct_at_path_from_parts(Dwarf_Macro_Context mc)

{

    if (mc->mc_file_path) {

        return mc->mc_file_path;

    }

    if (!mc->mc_at_comp_dir || !mc->mc_at_comp_dir[0]) {

        return mc->mc_at_name;

    }

    if (!mc->mc_at_name || !mc->mc_at_name[0]) {

        return NULL;

    }

    if (_dwarf_file_name_is_full_path(

        (Dwarf_Small *)mc->mc_at_name)) {

        return mc->mc_at_name;

    }

    /* Dwarf_Macro_Context destructor will free this. */

    mc->mc_file_path = construct_from_dir_and_name(

        mc->mc_at_comp_dir,mc->mc_at_name);

    return mc->mc_file_path;

}

int

dwarf_get_macro_startend_file(Dwarf_Macro_Context macro_context,

    Dwarf_Unsigned op_number,

    Dwarf_Unsigned * line_number,

    Dwarf_Unsigned * name_index_to_line_tab,

    const char     ** src_file_name,

    Dwarf_Error *error)

{

    Dwarf_Debug dbg = 0;

    Dwarf_Small *mdata = 0;

    unsigned macop = 0;

    struct Dwarf_Macro_Operator_s *curop = 0;

    Dwarf_Byte_Ptr startptr =  0;

    Dwarf_Byte_Ptr endptr =  0;

    CHECKNULLCONTEXT(macro_context,dbg,error);

    dbg = macro_context->mc_dbg;

    if (op_number >= macro_context->mc_macro_ops_count) {

        _dwarf_error(dbg, error,DW_DLE_BAD_MACRO_INDEX);

        return DW_DLV_ERROR;

    }

    startptr = macro_context->mc_macro_header;

    endptr = startptr + macro_context->mc_total_length;

    curop = macro_context->mc_ops + op_number;

    macop = curop->mo_opcode;

    mdata = curop->mo_data;

    if (macop != DW_MACRO_start_file && macop != DW_MACRO_end_file) {

        return DW_DLV_NO_ENTRY;

    }

    if (macop == DW_MACRO_start_file) {

        Dwarf_Unsigned linenum = 0;

        Dwarf_Unsigned srcindex = 0;

        Dwarf_Signed trueindex = 0;

        DECODE_LEB128_UWORD_CK(mdata,linenum, dbg, error,endptr);

        DECODE_LEB128_UWORD_CK(mdata,srcindex, dbg, error,endptr);

        *line_number = linenum;

        *name_index_to_line_tab = srcindex;

        /*  We deal with  DWARF4 GNU extension

            with .debug_macro version number 4

            and DWARF5 .debug_macro version number 5.

        */

        if (macro_context->mc_version_number == DW_MACRO_VERSION5) {

            trueindex = srcindex;

            if (trueindex < 0) {

                *src_file_name =

                    "<source-file-index-low-no-name-available>";

                return DW_DLV_OK;

            }

            if (trueindex < macro_context->mc_srcfiles_count) {

                *src_file_name =

                    macro_context->mc_srcfiles[trueindex];

                return DW_DLV_OK;

            } else {

                *src_file_name =

                    "<src-index-high-no-source-file-name-available>";

                return DW_DLV_OK;

            }

        } else {

            /* All except DWARF5 */

            /* Unsigned to signed here. */

            trueindex = srcindex;

            /*  Protects against crazy big srcindex,

                overflow territory. */

            if (trueindex < 0 ) {

                /* Something insane here. */

                *src_file_name =

                    "<source-file-index-low-no-name-available>";

                return DW_DLV_OK;

            }

            /*  Protects against crazy big srcindex,

                overflow territory. */

            if (trueindex > (macro_context->mc_srcfiles_count+1)) {

                /* Something insane here. */

                *src_file_name =

                    "<source-file-index-high-no-name-available>";

                return DW_DLV_OK;

            }

            --trueindex; /* might now be -1 */

            if (trueindex > macro_context->mc_srcfiles_count) {

                *src_file_name =

                    "<adjusted-source-file-index-high-"

                    "no-name-available>";

            }

            if (srcindex > 0 &&

                trueindex < macro_context->mc_srcfiles_count) {

                *src_file_name =

                    macro_context->mc_srcfiles[trueindex];

            } else {

                const char *mcatcomp =

                    construct_at_path_from_parts(macro_context);

                if (mcatcomp) {

                    *src_file_name = mcatcomp;

                } else {

                    *src_file_name =

                    "<no-source-file-name-available>";

                }

            }

        }

    } else {

        /* DW_MACRO_end_file. No operands. */

    }

    return DW_DLV_OK;

}

/*  Target_offset is the offset in a .debug_macro section,

    of a macro unit header.

    Returns DW_DLV_NO_ENTRY if the macro operator is not

    one of the import operators.  */

int

dwarf_get_macro_import(Dwarf_Macro_Context macro_context,

    Dwarf_Unsigned   op_number,

    Dwarf_Unsigned * target_offset,

    Dwarf_Error *error)

{

    Dwarf_Unsigned supoffset = 0;

    Dwarf_Debug dbg = 0;

    unsigned macop = 0;

    struct Dwarf_Macro_Operator_s *curop = 0;

    Dwarf_Small *mdata = 0;

    Dwarf_Byte_Ptr startptr =  0;

    Dwarf_Byte_Ptr endptr =  0;

    CHECKNULLCONTEXT(macro_context,dbg,error);

    startptr = macro_context->mc_macro_header;

    endptr = startptr + macro_context->mc_total_length;

    dbg = macro_context->mc_dbg;

    if (op_number >= macro_context->mc_macro_ops_count) {

        _dwarf_error(dbg, error,DW_DLE_BAD_MACRO_INDEX);

        return DW_DLV_ERROR;

    }

    curop = macro_context->mc_ops + op_number;

    macop = curop->mo_opcode;

    mdata = curop->mo_data;

    if (macop != DW_MACRO_import && macop != DW_MACRO_import_sup) {

        return DW_DLV_NO_ENTRY;

    }

    READ_UNALIGNED_CK(dbg,supoffset,Dwarf_Unsigned,

        mdata,macro_context->mc_offset_size,

        error,endptr);

    *target_offset = supoffset;

    return DW_DLV_OK;

}

/* */

static int

valid_macro_form(Dwarf_Half form)

{

    switch(form) {

    case DW_FORM_block:

    case DW_FORM_block1:

    case DW_FORM_block2:

    case DW_FORM_block4:

    case DW_FORM_data1:

    case DW_FORM_data2:

    case DW_FORM_data4:

    case DW_FORM_data8:

    case DW_FORM_data16:

    case DW_FORM_sdata:

    case DW_FORM_udata:

    case DW_FORM_flag:

    case DW_FORM_sec_offset:

    case DW_FORM_string:

    case DW_FORM_strp:

    case DW_FORM_strx:

        return TRUE;

    default: break;

    }

    return FALSE;

}

static int

validate_opcode(Dwarf_Debug dbg,

    struct Dwarf_Macro_Forms_s *curform,

    Dwarf_Error * error)

{

    unsigned i = 0;

    struct Dwarf_Macro_Forms_s *stdfptr = 0;

    if (curform->mf_code >= DW_MACRO_lo_user) {

        /* Nothing to check. user level. */

        return DW_DLV_OK;

    }

    if (curform->mf_code > DW_MACRO_undef_strx) {

        _dwarf_error(dbg, error, DW_DLE_MACRO_OPCODE_BAD);

        return DW_DLV_ERROR;

    }

    if (!curform->mf_code){

        _dwarf_error(dbg, error, DW_DLE_MACRO_OPCODE_BAD);

        return DW_DLV_ERROR;

    }

    stdfptr = &dwarf_default_macro_opslist.mol_data[curform->mf_code];

    if (curform->mf_formcount != stdfptr->mf_formcount) {

        _dwarf_error(dbg, error, DW_DLE_MACRO_OPCODE_FORM_BAD);

        return DW_DLV_ERROR;

    }

    for (i = 0; i < curform->mf_formcount; ++i) {

        if (curform->mf_formbytes[i] != stdfptr->mf_formbytes[1]) {

            _dwarf_error(dbg, error, DW_DLE_MACRO_OPCODE_FORM_BAD);

            return DW_DLV_ERROR;

        }

    }

    return DW_DLV_OK;

}

static int

read_operands_table(Dwarf_Macro_Context macro_context,

    Dwarf_Small * macro_header,

    Dwarf_Small * macro_data,

    Dwarf_Small * section_base,

    Dwarf_Unsigned section_size,

    Dwarf_Unsigned *table_size_out,

    Dwarf_Error *error)

{

    Dwarf_Small* table_data_start = macro_data;

    Dwarf_Unsigned local_size = 0;

    Dwarf_Unsigned cur_offset = 0;

    Dwarf_Small operand_table_count = 0;

    unsigned i = 0;

    struct Dwarf_Macro_Forms_s *curformentry = 0;

    Dwarf_Debug dbg = 0;

    Dwarf_Byte_Ptr startptr = 0;

    Dwarf_Byte_Ptr endptr = 0;

    CHECKNULLCONTEXT(macro_context,dbg,error);

    dbg = macro_context->mc_dbg;

    cur_offset = (1+ macro_data) - macro_header;

    if (cur_offset >= section_size) {

        _dwarf_error(dbg, error, DW_DLE_MACRO_OFFSET_BAD);