Standard Portable Library: spl/interp/Program.h Source File

00001 /*
00002  *   This file is part of the Standard Portable Library (SPL).
00003  *
00004  *   SPL is free software: you can redistribute it and/or modify
00005  *   it under the terms of the GNU General Public License as published by
00006  *   the Free Software Foundation, either version 3 of the License, or
00007  *   (at your option) any later version.
00008  *
00009  *   SPL is distributed in the hope that it will be useful,
00010  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012  *   GNU General Public License for more details.
00013  *
00014  *   You should have received a copy of the GNU General Public License
00015  *   along with SPL.  If not, see <http://www.gnu.org/licenses/>.
00016  */
00017 #ifndef _interp_program_h
00018 #define _interp_program_h
00019 
00020 #include <spl/types.h>
00021 #include <spl/Debug.h>
00022 #include <spl/Memory.h>
00023 #include <spl/interp/OpCodes.h>
00024 #include <spl/RefCountPtr.h>
00025 #include <spl/collection/StringTable.h>
00026 #include <spl/Variant.h>
00027 #include <spl/collection/Vector.h>
00028 
00029 struct Instruction
00030 {
00031         uint32 opCode : 8;
00032         uint32 argSrc : 4;
00033         uint32 argIdx : 24;
00034 };
00035 
00036 inline void ValidateType(const struct Instruction& i)
00037 {
00038 }
00039 
00040 class Program : IMemoryValidate
00041 {
00042 private:
00043         Vector<VariantPtr> m_cdata;
00044         Vector<Instruction> m_code;
00045         Instruction m_exitInstr;
00046         int m_argCount;                         //< This many items should be on the stack when program is ran.
00047         
00048 public:
00049         Program();
00050         Program(const Program& program);
00051         Program& operator =(const Program& program);
00052         virtual ~Program();
00053 
00054         void Clear();
00055 
00056         inline void NoteArgument() { m_argCount++; }
00057         inline int ArgumentCount() const { return m_argCount; }
00058 
00059         int AddToTable(const String& s);
00060         int AddToTable(const int32 i);
00061         int AddToTable(const float64 f);
00062         int AddToTable(const Date& dt);
00063         int AddToTable(const DateTime& dtm);
00064 
00065         int AppendCode(enum JsOpCode i, JsOpCodeArgSrc s, int32 idx);
00066         inline int AppendCode(enum JsOpCode c) { return AppendCode(c, JSOPARG_NONE, 0); }
00067         
00068         void FixupCode(int pos, int32 idx);
00069         
00070         inline bool CanContinue(int pc) const
00071         {
00072                 return pc >= 0 && pc < m_code.Count();
00073         }
00074                 
00075         inline Instruction InstructionAt(int pc) const 
00076         { 
00077                 if (0 > pc || pc >= m_code.Count())
00078                 {
00079                         return m_exitInstr;
00080                 }
00081                 return m_code.ElementAt(pc);
00082         }
00083         
00084         inline VariantPtr GetArg(Instruction i, Vector<VariantPtr>& stk) const
00085         {
00086                 if (JSOPARG_IMM == i.argSrc)
00087                 {
00088                         return VariantPtr(new Variant((int32)i.argIdx));
00089                 }
00090                 if (JSOPARG_TAB == i.argSrc)
00091                 {
00092                         return m_cdata.ElementAt(i.argIdx);
00093                 }
00094                 if (JSOPARG_STK == i.argSrc)
00095                 {
00096                         return stk.ElementAt(i.argIdx);
00097                 }
00098                 throw new Exception("Invalid argument source in Program::GetArg");
00099         }
00100 
00101 #if defined(DEBUG) || defined(_DEBUG)
00102         void CheckMem() const;
00103         void ValidateMem() const;
00104 #endif
00105 };
00106 
00107 #endif