datadtor.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 147 行

/****************************************************************************
*
*                            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
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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****************************************************************************/


#include "plusplus.h"
#include "cgfront.h"
#include "datadtor.h"
#include "fnbody.h"
#include "cdopt.h"

#ifndef NDEBUG
    #include "dbg.h"
    #include "toggle.h"
    #include "pragdefn.h"
    #include <stdio.h>
#endif


static PTREE addPtIc(           // DECORATE TREE WITH PT_IC NODE
    PTREE tree,                 // - tree
    PTREE node )                // - IC node
{
    PTREE *a_expr;              // - expression for side-effect

    if( tree == NULL ) {
        CgFrontCodePtr( node->u.ic.opcode, node->u.ic.value.pvalue );
        CgFrontCode( IC_EXPR_TRASH );
        PTreeFree( node );
        tree = NULL;
    } else {
        PTREE dup = tree;
        if( NodeIsUnaryOp( tree, CO_EXPR_DONE ) ) {
            a_expr = &dup->u.subtree[0];
        } else {
            a_expr = &dup;
        }
        *a_expr = NodeAddSideEffect( node, *a_expr );
        tree = dup;
    }
    return tree;
}


static PTREE addPtIcUnsigned(   // DECORATE TREE WITH PT_IC NODE (unsigned)
    PTREE tree,                 // - tree
    unsigned opcode,            // - opcode
    unsigned value )            // - value
{
    return addPtIc( tree, NodeIcUnsigned( opcode, value ) );
}


PTREE DataDtorObjPush(          // START OF DTORABLE OBJECT
    PTREE expr,                 // - expression to be decorated
    TYPE type,                  // - type of object
    SYMBOL init_sym,            // - symbol being initialized
    target_offset_t offset )    // - offset of object being initialized
{
    TYPE dtor_type;             // - type for dtor

#ifndef NDEBUG
    if( PragDbgToggle.dump_data_dtor ) {
        printf( "DataDtorObjPush -- symbol %s\n"
                "                -- offset %x\n"
                "                -- "
              , DbgSymNameFull( init_sym )
              , offset );
        DumpFullType( type );
    }
#endif
    dtor_type = type;
    if( NULL != ArrayType( dtor_type ) ) {
        dtor_type = ArrayBaseType( dtor_type );
    }
    CDoptDtorBuild( dtor_type );
    FunctionHasRegistration();
    return PtdObjPush( expr, type, init_sym, offset );
}


PTREE DataDtorObjPop(           // COMPLETE DTORABLE OBJECT
    PTREE expr )                // - expression to be decorated
{
#ifndef NDEBUG
    if( PragDbgToggle.dump_data_dtor ) {
        printf( "DataDtorObjPop\n" );
    }
#endif
    return PtdObjPop( expr );
}


PTREE DataDtorCompClass(        // MARK CLASS OBJECT AS DTORABLE COMPONENT
    PTREE expr,                 // - expression to be decorated
    target_offset_t offset,     // - offset of component
    unsigned dtc_kind )         // - kind of component
{
#ifndef NDEBUG
    if( PragDbgToggle.dump_data_dtor ) {
        printf( "DataDtorCompClass -- offset %x\n", offset );
    }
#endif
    FunctionHasCtorTest();
    return PtdCompCtored( expr, offset, dtc_kind );
}


PTREE DataDtorCompArrEl(        // MARK ARRAY ELEMENT AS DTORABLE COMPONENT
    PTREE expr,                 // - expression to be decorated
    target_offset_t index )     // - array index
{
#ifndef NDEBUG
    if( PragDbgToggle.dump_data_dtor ) {
        printf( "DataDtorCompArrEl -- index(%x)\n", index );
    }
#endif
    return addPtIcUnsigned( expr, IC_DTARRAY_INDEX, index );
}