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162 lines
3.7 KiB
C++
162 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#include "Value.h"
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#if BATCH_COMPILATION
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const ConstructedAddress nullAddr(0);
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#endif
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#ifdef DEBUG_LOG
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//
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// Print this addr for debugging purposes.
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// Return the number of characters printed.
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//
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int print(LogModuleObject &f, addr a)
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{
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if (!a)
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return UT_OBJECTLOG(f, PR_LOG_ALWAYS, ("null"));
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else
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#if BATCH_COMPILATION
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return UT_OBJECTLOG(f, PR_LOG_ALWAYS, ("0x%.8X+%d", (size_t)a.getBase(), a.getOffset()));
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#else
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return UT_OBJECTLOG(f, PR_LOG_ALWAYS, ("0x%.8X", (size_t)a));
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#endif
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}
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#endif
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#if BATCH_COMPILATION
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inline void *addrToPointer(addr a) {return (char *)a.getBase() + a.getOffset();}
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#else
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inline void *addrToPointer(addr a) {return a;}
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#endif
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//
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// Read a field of the given TypeKind at a and store it in v.
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// Return true if the value was read successfully or false if it cannot
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// be read at compile time.
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//
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// The current implementation never returns false, but it could be modified
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// to do so if needed to support late binding in the batch compiler.
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//
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bool read(TypeKind tk, addr a, Value &v)
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{
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const void *p = addrToPointer(a);
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assert(p);
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switch (tk) {
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case tkVoid:
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break;
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case tkBoolean:
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case tkUByte:
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v.i = *static_cast<const Uint8 *>(p);
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break;
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case tkByte:
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v.i = *static_cast<const Int8 *>(p);
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break;
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case tkChar:
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v.i = *static_cast<const Uint16 *>(p);
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break;
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case tkShort:
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v.i = *static_cast<const Int16 *>(p);
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break;
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case tkInt:
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v.i = *static_cast<const Int32 *>(p);
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break;
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case tkLong:
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v.l = *static_cast<const Int64 *>(p);
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break;
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case tkFloat:
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v.f = *static_cast<const Flt32 *>(p);
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break;
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case tkDouble:
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v.d = *static_cast<const Flt64 *>(p);
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break;
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case tkObject:
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case tkSpecial:
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case tkArray:
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case tkInterface:
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v.a = objectAddress(*static_cast<const obj *>(p));
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break;
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}
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return true;
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}
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//
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// Write v into a field of the given TypeKind at a.
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//
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void write(TypeKind tk, addr a, const Value &v)
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{
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void *p = addrToPointer(a);
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assert(p);
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switch (tk) {
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case tkVoid:
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break;
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case tkBoolean:
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assert((v.i & -2) == 0);
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case tkUByte:
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case tkByte:
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*static_cast<Uint8 *>(p) = (Uint8)v.i;
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break;
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case tkChar:
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case tkShort:
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*static_cast<Uint16 *>(p) = (Uint16)v.i;
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break;
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case tkInt:
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*static_cast<Int32 *>(p) = v.i;
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break;
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case tkLong:
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*static_cast<Int64 *>(p) = v.l;
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break;
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case tkFloat:
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*static_cast<Flt32 *>(p) = v.f;
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break;
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case tkDouble:
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*static_cast<Flt64 *>(p) = v.d;
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break;
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case tkObject:
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case tkSpecial:
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case tkArray:
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case tkInterface:
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*static_cast<void **>(p) = addrToPointer(v.a);
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break;
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}
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}
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//
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// If known, return the type of the object at the given address. If not known,
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// return nil.
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//
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Type *objectAddressType(addr a)
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{
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if (!a)
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return 0;
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Value type;
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assert(objectTypeOffset == 0);
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if (!read(tkObject, a, type))
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return 0;
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return &addressAsType(type.a);
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}
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