mirror of
https://github.com/alliedmodders/amxmodx.git
synced 2024-12-26 14:55:36 +03:00
7acc70ee62
Added trivial float support Added local labels and vastly improved label support Fixed some crash bugs
534 lines
9.7 KiB
C++
Executable File
534 lines
9.7 KiB
C++
Executable File
/* AMX Assembler
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* Copyright (C)2004 David "BAILOPAN" Anderson
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*
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* Version: $Id$
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*/
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#include <string>
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#include "amxasm.h"
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CExpr::CExpr()
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{
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numVal = 0;
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type = Val_None;
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block = 0;
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bDone = false;
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CError = NULL;
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}
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CExpr::CExpr(ErrorMngr *e)
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{
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numVal = 0;
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type = Val_None;
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block = 0;
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bDone = false;
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CError = e;
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}
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CExpr::CExpr(ErrorMngr *e, std::string &text)
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{
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numVal = 0;
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type = Val_None;
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block = 0;
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CError = e;
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bDone = false;
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data.assign(text);
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}
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void CExpr::Clear()
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{
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if (type == Val_Block && block)
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delete [] block;
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numVal = 0;
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type = Val_None;
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block = 0;
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}
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CExpr::~CExpr()
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{
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if (block && type == Val_Block)
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delete [] block;
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}
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char CExpr::IsLiteral(char c)
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{
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if (c == '"')
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return '"';
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if (c == '\'')
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return '\'';
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return 0;
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}
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char CExpr::IsHex(char c)
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{
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if (c >= '0' && c <= '9')
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return c;
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if (c >= 'A' && c <= 'F')
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return c;
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if (c >= 'a' && c <= 'f')
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return c;
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return 0;
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}
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cExprType CExpr::GetType()
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{
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return type;
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}
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void CExpr::Set(std::string &text)
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{
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data.assign(text);
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}
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int CExpr::DeHex(std::string blk)
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{
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size_t pos = 0, xc = 0, xpos = 0;
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/* run through the characters */
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for (pos = 0; pos < blk.size(); pos++)
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{
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if (blk[pos] == 'x')
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{
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xc++;
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if (xc > 1)
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break;
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xpos = pos;
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} else if (blk[pos] != ' '
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&& (blk[pos] < '0' || blk[pos] > '9')
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&& (!xc || (xc && !IsHex(blk[pos])))) {
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CError->ErrorMsg(Err_Unexpected_Char, blk[pos]);
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return 0;
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}
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}
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if (xc > 1)
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{
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CError->ErrorMsg(Err_Unexpected_Char, 'x');
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return 0;
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}
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if (xc)
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{
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if (xpos == 0 || blk[xpos-1] != '0')
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{
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if (CError)
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CError->ErrorMsg(Warning_Hex_Start);
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}
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blk.erase(0, xpos+1);
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pos = 0;
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int j = 0;
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while (blk[pos])
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{
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blk[pos] -= 48;
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if (blk[pos] > 16)
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blk[pos] -= 7;
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if (blk[pos] >= 16)
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blk[pos] -= 32;
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if (blk[pos] >= 16 || blk[pos] < 0)
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{
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if (CError)
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CError->ErrorMsg(Err_Unexpected_Char, blk[pos]);
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return 0;
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}
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j *= 16;
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j += blk[pos];
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pos++;
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}
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return j;
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}
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return atoi(blk.c_str());
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}
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int CExpr::Size()
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{
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if (type == Val_String || type == Val_Block)
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return numVal;
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if (type == Val_Number)
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return (SMALL_CELL_SIZE/8);
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return 0;
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}
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const char *CExpr::GetString(int *d)
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{
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const char *ret = 0;
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if (type == Val_String)
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{
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ret = data.c_str();
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if (d != NULL)
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*d = numVal;
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} else if (type == Val_Block) {
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ret = block;
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if (d != NULL)
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*d = numVal;
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}
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return ret;
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}
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int CExpr::GetNumber()
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{
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if (type == Val_Float)
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{
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memcpy((void*)&numVal, (void*)&fData, sizeof(float));
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}
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return numVal;
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}
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/* Returns true if the expr can be evaluated */
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int CExpr::Analyze()
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{
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size_t pos = 0, xc = 0, xpos = 0, fd = 0;
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/* run through the characters */
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if (data.compare("$") == 0)
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{
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return 1;
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}
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for (pos = 0; pos < data.size(); pos++)
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{
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if (data[pos] == '.')
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{
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fd++;
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if (fd > 1 || xc)
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return 0;
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} else if (data[pos] == 'x') {
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xc++;
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if (xc > 1 || fd)
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return 0;
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xpos = pos;
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} else if (data[pos] != ' '
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&& (data[pos] < '0' || data[pos] > '9')
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&& (!xc || (xc && !IsHex(data[pos])))) {
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return 0;
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}
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}
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return 1;
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}
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cExprType CExpr::Evaluate(int symNum)
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{
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size_t i = 0, blk = 0;
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char litc = 0, c = 0, csave = 0;
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cExprType t = Val_None;
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std::string num;
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block = new char[2];
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bDone = true;
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if (data.compare("$") == 0)
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{
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type = Val_Number;
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numVal = CError->CurCip();
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Update();
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return t;
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} else {
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if (CError->IsSymbol(data) || (IsValidSymbol(data) && symNum == Sym_Label))
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{
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type = Val_Number;
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numVal = CError->DerefSymbol(data, symNum);
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Update();
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return t;
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}
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}
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if (data.find('\'', 0) != std::string::npos || data.find('"', 0) != std::string::npos)
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{
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/* STRESS TEST */
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for (i=0; i<data.size(); i++)
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{
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c = data[i];
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if (c == '\\')
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{
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if (i == data.size() - 1)
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{
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if (CError)
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CError->ErrorMsg(Err_String_Terminate);
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t = Val_Error;
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} else {
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char cp = data[i+1];
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char *nc = 0;
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if (cp == 't')
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nc = "\t";
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else if (cp == 'n')
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nc = "\n";
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else if (cp == '\\')
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nc = "\\";
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else if (cp == '"')
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nc = "\"";
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else if (cp == '\'')
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nc = "'";
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if (nc)
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{
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data.replace(i, 2, nc);
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continue;
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}
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}
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}
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if (IsLiteral(c) != 0)
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{
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if (litc == IsLiteral(c))
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{
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litc = 0;
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/* The literal has terminated. Expect no more. */
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if (i != data.size() - 1)
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{
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t = Val_Error;
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if (CError)
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CError->ErrorMsg(Err_String_Extra, data[i+1]);
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} else {
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/* STRING DISCOVERED */
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t = Val_String;
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/* Erase literals */
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data.erase(0, 1);
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data.erase(data.size()-1, 1);
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numVal = (int)(data.size()+1);
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break;
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}
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} else {
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litc = IsLiteral(c);
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}
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}
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}
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} else if (data.find(' ', 0) != std::string::npos) {
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/* Build a mem block from values, store length in numVal */
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t = Val_Block;
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size_t pos = 0, npos = 0;
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numVal = 0;
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pos = data.find(' ', 0);
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block[numVal++] = DeHex(data.substr(0, pos));
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while ((pos = data.find(' ', pos)) != std::string::npos)
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{
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npos = data.find(' ', pos+1);
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block = (char *)realloc(block, numVal+2);
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if (npos != std::string::npos)
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{
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block[numVal] = (char)DeHex(data.substr(pos, npos-pos));
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} else {
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block[numVal] = (char)DeHex(data.substr(pos));
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}
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pos++;
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numVal++;
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}
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} else {
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if (data.find('.', 0) != std::string::npos)
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{
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/* Get as a float */
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fData = (float)atof(data.c_str());
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t = Val_Float;
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memcpy((void*)&numVal, (void*)&fData, sizeof(float));
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} else {
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/* Just get the number */
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t = Val_Number;
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numVal = DeHex(data);
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char buf[32];
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sprintf(buf, "%d", numVal);
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data.assign(buf);
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}
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}
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if (litc)
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{
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if (CError)
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CError->ErrorMsg(Err_String_Terminate);
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}
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type = t;
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return t;
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}
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void CExpr::Not()
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{
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if (type != Val_Number)
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{
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if (CError)
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CError->ErrorMsg(Err_Bad_Not);
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}
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numVal = ~numVal;
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}
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void CExpr::Oper(OpToken op, CExpr &e)
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{
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switch (op)
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{
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case Token_Xor:
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{
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if (e.GetType() != Val_Number)
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{
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if (CError)
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CError->ErrorMsg(Err_Invalid_Operator);
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}
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numVal = numVal ^ e.GetNumber();
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break;
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}
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case Token_Shr:
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{
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if (e.GetType() != Val_Number)
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{
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if (CError)
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CError->ErrorMsg(Err_Invalid_Operator);
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}
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numVal >>= e.GetNumber();
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break;
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}
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case Token_Sub:
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{
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if (GetType() == Val_Number)
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{
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if (e.GetType() == Val_Number)
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{
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numVal -= e.GetNumber();
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} else if (e.GetType() == Val_Float) {
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numVal -= (int)e.GetFloat();
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}
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} else if (GetType() == Val_Float) {
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if (e.GetType() == Val_Number)
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{
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fData -= (float)e.GetNumber();
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} else if (e.GetType() == Val_Float) {
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fData -= e.GetFloat();
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}
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}
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break;
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}
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case Token_Mod:
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{
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if (e.GetType() != Val_Number)
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{
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if (CError)
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CError->ErrorMsg(Err_Invalid_Operator);
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}
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numVal = numVal % e.GetNumber();
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break;
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}
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case Token_Mul:
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{
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if (GetType() == Val_Number)
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{
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if (e.GetType() == Val_Number)
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{
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numVal *= e.GetNumber();
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} else if (e.GetType() == Val_Float) {
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numVal *= (int)e.GetFloat();
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}
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} else if (GetType() == Val_Float) {
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if (e.GetType() == Val_Number)
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{
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fData *= (float)e.GetNumber();
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} else if (e.GetType() == Val_Float) {
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fData *= e.GetFloat();
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}
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}
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break;
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}
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case Token_Div:
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{
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if (GetType() == Val_Number)
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{
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if (e.GetType() == Val_Number)
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{
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numVal /= e.GetNumber();
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} else if (e.GetType() == Val_Float) {
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numVal /= (int)e.GetFloat();
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}
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} else if (GetType() == Val_Float) {
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if (e.GetType() == Val_Number)
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{
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fData /= (float)e.GetNumber();
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} else if (e.GetType() == Val_Float) {
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fData /= e.GetFloat();
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}
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}
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break;
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}
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case Token_Shl:
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{
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if (e.GetType() != Val_Number)
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{
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if (CError)
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CError->ErrorMsg(Err_Invalid_Operator);
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}
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numVal <<= e.GetNumber();
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break;
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}
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case Token_And:
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{
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if (e.GetType() != Val_Number)
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{
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if (CError)
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CError->ErrorMsg(Err_Invalid_Operator);
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}
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numVal &= e.GetNumber();
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break;
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}
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case Token_Or:
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{
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if (e.GetType() != Val_Number)
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{
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if (CError)
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CError->ErrorMsg(Err_Invalid_Operator);
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}
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numVal |= e.GetNumber();
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break;
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}
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case Token_Add:
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{
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if (GetType() == Val_Number)
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{
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if (e.GetType() == Val_Number)
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{
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numVal += e.GetNumber();
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} else if (e.GetType() == Val_Float) {
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numVal += (int)e.GetFloat();
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}
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} else if (GetType() == Val_Float) {
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if (e.GetType() == Val_Number)
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{
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fData += (float)e.GetNumber();
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} else if (e.GetType() == Val_Float) {
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fData += e.GetFloat();
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}
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}
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break;
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}
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default:
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{
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numVal = 0;
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break;
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}
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}
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Update();
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}
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void CExpr::Update()
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{
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if (type == Val_Float)
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{
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numVal = (int)fData;
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} else if (type == Val_Number) {
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fData = (float)numVal;
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}
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if (type != Val_String && type != Val_Block)
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{
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char buf[24];
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sprintf(buf, "%d", numVal);
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data.assign(buf);
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}
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} |