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101 lines
3.1 KiB
C++
101 lines
3.1 KiB
C++
/*
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* Opcode argument data structures KJS/Frostbyte
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* This file is part of the KDE libraries
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* Copyright (C) 2008 Maksim Orlovich (maksim@kde.org)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifndef OP_ARGS_H
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#define OP_ARGS_H
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#include "opcodes.h"
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namespace KJS {
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class Node;
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class RegDescriptor;
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// The NarrowArg and WideArg unions correspond to the encoding of
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// 4- and 8-byte arguments in the bytecode.
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// Note that the union field names should correspond to codes.def types ---
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// type foo will be accessed as fooVal
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union NarrowArg
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{
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bool boolVal;
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int32_t int32Val;
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Addr addrVal;
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Register regVal;
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unsigned char asBytes[4];
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};
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union WideArg
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{
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JSValue* valueVal;
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Identifier* identVal;
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UString* stringVal;
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double numberVal;
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Node* nodeVal;
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const char* cstrVal;
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unsigned char asBytes[8];
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};
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// This describes where result of evaluating an expression, or an argument
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// to a function, is stored. If immediate is true, it is included directly inside
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// the structure. Otherwise, it's passed by the register number specified in
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// ownedReg->reg()
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// Note: there is a difference between values stored in registers, and register names.
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// The former have immediate = false, and some type such as OpType_Bool; the latter have
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// immediate = true, and type = OpType_reg.
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struct OpValue
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{
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bool immediate;
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OpType type;
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RefPtr<RegDescriptor> ownedReg; // Register the lifetime of which we reserve, including the register #
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union {
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NarrowArg narrow;
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WideArg wide;
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} value;
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OpValue();
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// A few helpers for making immediate values... These are actually inside CompileState.h
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// due to them touching the ownedTemp;
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static void initImm(OpValue* val, OpType type) {
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val->immediate = true;
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val->type = type;
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}
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// A placeholder address value, will be patched up later
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static OpValue* dummyAddr();
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static OpValue immInt32(int32_t in);
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static OpValue immNumber(double in);
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static OpValue immValue(JSValue* in);
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static OpValue immBool(bool in);
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static OpValue immString(UString* in);
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static OpValue immIdent(Identifier* in);
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static OpValue immNode(Node* in);
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static OpValue immCStr(const char* in);
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static OpValue immAddr(Addr in);
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};
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}
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#endif
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// kate: indent-width 4; replace-tabs on; tab-width 4; space-indent on;
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