drtype.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 548 行 · 第 1/2 页

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:  DWARF type information processing.
*
****************************************************************************/


#include "drpriv.h"
#include "drutils.h"

static bool   DWRGetConstAT( dr_handle abbrev, dr_handle info,
                                               unsigned at,
                                               unsigned_32  *where )
/******************************************************************/
/* look for a specific attribute in the list of attributes */
/* if found read in   */
{
    unsigned    attrib;
    unsigned    form;
    bool        ret;

    ret = FALSE;
    for( ;; ) {
        attrib = DWRVMReadULEB128( &abbrev );
        if( attrib == at ) break;
        form = DWRVMReadULEB128( &abbrev );
        if( attrib == 0 ) break;
        DWRSkipForm( &info, form );
    }
    if( attrib != 0 ) {
        *where = DWRReadConstant( abbrev, info );
        ret = TRUE;
    }
    return( ret );
}
static int DWRGetAT( dr_handle abbrev, dr_handle  info,
                     dr_val32  *vals, uint_16 const  *at )
/********************************************************/
/* look for a specific attribute in the list of attributes */
/* if found read in   */
{
    unsigned    attrib;
    unsigned    form;
    uint_16     index;
    dwr_formcl  formcl;
    uint_32     value;
    int         count;
    int         max;

    count = 0;
    for( index = 0; at[index] != 0; ++index ) {
        vals[index].val_class = DR_VAL_NOT;
    }
    max = index;
    for( ;; ) {
        attrib = DWRVMReadULEB128( &abbrev );
        if( attrib == 0 ) break;
        form = DWRVMReadULEB128( &abbrev );
        for( index = 0; index < max; ++index ) {
            if( attrib == at[index] ) {
                ++count;
                if( form == DW_FORM_indirect ) {
                    form = DWRVMReadULEB128( &info );
                }
                formcl = DWRFormClass( form );
                value = ReadConst(  form, info );
                if( formcl == DWR_FORMCL_data ) {
                    vals[index].val_class = DR_VAL_INT;
                    vals[index].val.s = value;
                } else {
                    value += DWRFindCompileUnit( info );
                    vals[index].val_class = DR_VAL_REF;
                    vals[index].val.ref = value;
                }
            }
        }
        DWRSkipForm( &info, form );
    }
    return( count );
}


static unsigned_16 const SubATList[] = {
    DW_AT_lower_bound,
    DW_AT_upper_bound,
    DW_AT_count,
    0,
};


extern void DRGetSubrangeInfo( dr_handle sub, dr_subinfo *info )
/**************************************************************/
{
    dr_handle   abbrev;
    int         tag;
    dr_val32    vals[3];

    abbrev = DWRVMReadULEB128( &sub );
    abbrev = DWRLookupAbbrev( sub, abbrev );
    tag = DWRVMReadULEB128( &abbrev );
    ++abbrev; /* skip child flag */
    DWRGetAT( abbrev, sub, vals, SubATList );
    info->low = vals[0];
    info->high = vals[1];
    info->count = vals[2];
}

static unsigned_16 const BitATList[] = {
    DW_AT_byte_size,
    DW_AT_bit_offset,
    DW_AT_bit_size,
    0,
};

extern int DRGetBitFieldInfo( dr_handle mem, dr_bitfield *info )
/**************************************************************/
{
    dr_handle   abbrev;
    int         tag;
    dr_val32    vals[3];
    int         count;

    abbrev = DWRVMReadULEB128( &mem );
    abbrev = DWRLookupAbbrev( mem, abbrev );
    tag = DWRVMReadULEB128( &abbrev );
    ++abbrev; /* skip child flag */
    count =  DWRGetAT( abbrev, mem, vals, BitATList );
    info->byte_size = vals[0];
    info->bit_offset = vals[1];
    info->bit_size = vals[2];
    return( count );
}


extern bool DRGetTypeInfo( dr_handle entry,  dr_typeinfo *info )
/**************************************************************/
// Assume entry is pointing at start of a type
{
    dr_handle   curr_ab;
    dr_handle   abbrev;
    dr_handle   curr_ent;
    dw_tagnum   tag;
    uint_32     value;
    dr_typek    kind;

    info->acc = DR_STORE_NONE;
    info->mclass = DR_MOD_NONE;

    for( ;; ) {
        if( entry == DR_HANDLE_VOID ) {
            info->kind = DR_TYPEK_VOID;
            info->mclass = DR_MOD_BASE;
            info->size = 0;
            info->modifier.sign = FALSE;
            return( TRUE );
        }
        abbrev = DWRVMReadULEB128( &entry );
        abbrev = DWRLookupAbbrev( entry, abbrev );
        tag = DWRVMReadULEB128( &abbrev );
        ++abbrev; /* skip child flag */
        switch( tag ) {
        case DW_TAG_array_type:
            kind = DR_TYPEK_ARRAY;
            goto end_loop;
        case DW_TAG_enumeration_type:
            kind = DR_TYPEK_ENUM;
            info->mclass = DR_MOD_BASE;
            goto end_loop;
        case DW_TAG_pointer_type:
            kind = DR_TYPEK_POINTER;
            info->mclass = DR_MOD_ADDR;
            goto end_loop;
        case DW_TAG_string_type:
            kind = DR_TYPEK_STRING;
            goto end_loop;
        case DW_TAG_structure_type:
            kind = DR_TYPEK_STRUCT;
            goto end_loop;
        case DW_TAG_union_type:
            kind = DR_TYPEK_UNION;
            goto end_loop;
        case DW_TAG_class_type:
            kind = DR_TYPEK_CLASS;
            goto end_loop;
        case DW_TAG_subprogram:
        case DW_TAG_subroutine_type:
            kind = DR_TYPEK_FUNCTION;
            goto end_loop;
        case DW_TAG_reference_type:
            kind = DR_TYPEK_REF;
            info->mclass = DR_MOD_ADDR;
            goto end_loop;
        case DW_TAG_ptr_to_member_type:
            kind = DR_TYPEK_ADDRESS;
            goto end_loop;
        case DW_TAG_set_type:
            kind = DR_TYPEK_DATA;
            goto end_loop;
        case DW_TAG_subrange_type:
            kind = DR_TYPEK_DATA;
            info->mclass = DR_MOD_BASE;
            goto end_loop;
            break;
        case DW_TAG_base_type:
            info->mclass = DR_MOD_BASE;
            goto end_loop;
        case DW_TAG_file_type:
            kind = DR_TYPEK_DATA;
            goto end_loop;
        case DW_TAG_thrown_type:
            kind = DR_TYPEK_CODE;
            goto end_loop;
        /*** goes for loop ***/
        case DW_TAG_const_type:
            info->acc |= DR_STORE_CONST;
            break;
        case DW_TAG_volatile_type:
            info->acc |= DR_STORE_VOLATILE;
            break;
        case DW_TAG_packed_type:
            info->acc |= DR_STORE_PACKED;
            break;
        case DW_TAG_typedef:
            break;
        default:
            goto error;
        }
        curr_ab = abbrev;
        curr_ent = entry;
        if( DWRScanForAttrib( &curr_ab, &curr_ent, DW_AT_type ) != 0 ) {
            entry = DWRReadReference( curr_ab, curr_ent );
        } else {
            goto error;
        }
    }end_loop:;
    info->kind = kind;
    if( info->mclass != DR_MOD_ADDR ) {
        if( DWRGetConstAT( abbrev, entry, DW_AT_byte_size, &value ) ) {
            info->size =  value;
        } else {
            info->size = 0;
        }
    }
    switch( info->mclass ) {
    case DR_MOD_BASE:
        if( DWRGetConstAT( abbrev, entry, DW_AT_encoding, &value ) ) {
            switch( value ) {
            case DW_ATE_address:
                info->kind = DR_TYPEK_ADDRESS;
                info->modifier.sign = FALSE;