forked from 0ad/0ad
Stan
215447a761
Add #elif support and some fixes. Reviewed by: @vladislavbelov Differential Revision: https://code.wildfiregames.com/D2456 This was SVN commit r23404.
1381 lines
40 KiB
C++
1381 lines
40 KiB
C++
/*
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* This source file originally came from OGRE v1.12.3 - http://www.ogre3d.org/
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* with some tweaks as part of 0 A.D.
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* All changes are released under the original license, as follows:
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*/
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/*
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-----------------------------------------------------------------------------
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This source file is part of OGRE
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(Object-oriented Graphics Rendering Engine)
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For the latest info, see http://www.ogre3d.org/
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Copyright (c) 2000-2014 Torus Knot Software Ltd
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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-----------------------------------------------------------------------------
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*/
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#include "precompiled.h"
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#include "lib/debug.h"
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#include "OgreGLSLPreprocessor.h"
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#include <ctype.h>
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#include <stdio.h>
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namespace Ogre
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{
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// Limit max number of macro arguments to this
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#define MAX_MACRO_ARGS 16
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/// Return closest power of two not smaller than given number
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static size_t ClosestPow2 (size_t x)
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{
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if (!(x & (x - 1)))
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return x;
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while (x & (x + 1))
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x |= (x + 1);
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return x + 1;
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}
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void CPreprocessor::Token::Append (const char *iString, size_t iLength)
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{
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Token t (Token::TK_TEXT, iString, iLength);
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Append (t);
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}
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void CPreprocessor::Token::Append (const Token &iOther)
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{
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if (!iOther.String)
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return;
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if (!String)
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{
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String = iOther.String;
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Length = iOther.Length;
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Allocated = iOther.Allocated;
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iOther.Allocated = 0; // !!! not quite correct but effective
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return;
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}
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if (Allocated)
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{
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size_t new_alloc = ClosestPow2 (Length + iOther.Length);
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if (new_alloc < 64)
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new_alloc = 64;
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if (new_alloc != Allocated)
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{
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Allocated = new_alloc;
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Buffer = (char *)realloc (Buffer, Allocated);
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}
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}
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else if (String + Length != iOther.String)
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{
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Allocated = ClosestPow2 (Length + iOther.Length);
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if (Allocated < 64)
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Allocated = 64;
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char *newstr = (char *)malloc (Allocated);
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memcpy (newstr, String, Length);
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Buffer = newstr;
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}
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if (Allocated)
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memcpy (Buffer + Length, iOther.String, iOther.Length);
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Length += iOther.Length;
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}
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bool CPreprocessor::Token::GetValue (long &oValue) const
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{
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long val = 0;
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size_t i = 0;
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while (isspace (String [i]))
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i++;
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long base = 10;
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if (String [i] == '0')
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{
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if (Length > i + 1 && String [i + 1] == 'x')
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base = 16, i += 2;
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else
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base = 8;
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}
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for (; i < Length; i++)
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{
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int c = int (String [i]);
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if (isspace (c))
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// Possible end of number
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break;
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if (c >= 'a' && c <= 'z')
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c -= ('a' - 'A');
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c -= '0';
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if (c < 0)
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return false;
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if (c > 9)
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c -= ('A' - '9' - 1);
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if (c >= base)
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return false;
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val = (val * base) + c;
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}
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// Check that all other characters are just spaces
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for (; i < Length; i++)
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if (!isspace (String [i]))
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return false;
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oValue = val;
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return true;
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}
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void CPreprocessor::Token::SetValue (long iValue)
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{
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char tmp [21];
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int len = snprintf (tmp, sizeof (tmp), "%ld", iValue);
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Length = 0;
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Append (tmp, len);
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Type = TK_NUMBER;
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}
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void CPreprocessor::Token::AppendNL (int iCount)
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{
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static const char newlines [8] =
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{ '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n' };
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while (iCount > 8)
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{
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Append (newlines, 8);
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iCount -= 8;
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}
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if (iCount > 0)
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Append (newlines, iCount);
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}
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int CPreprocessor::Token::CountNL ()
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{
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if (Type == TK_EOS || Type == TK_ERROR)
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return 0;
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const char *s = String;
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size_t l = Length;
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int c = 0;
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while (l > 0)
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{
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const char *n = (const char *)memchr (s, '\n', l);
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if (!n)
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return c;
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c++;
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l -= (n - s + 1);
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s = n + 1;
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}
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return c;
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}
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CPreprocessor::Token CPreprocessor::Macro::Expand(const std::vector<Token>& iArgs,
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std::forward_list<Macro>& iMacros)
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{
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Expanding = true;
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CPreprocessor cpp;
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std::swap(cpp.MacroList, iMacros);
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// Define a new macro for every argument
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size_t i;
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for (i = 0; i < iArgs.size(); i++)
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cpp.Define (Args [i].String, Args [i].Length,
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iArgs [i].String, iArgs [i].Length);
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// The rest arguments are empty
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for (; i < Args.size(); i++)
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cpp.Define (Args [i].String, Args [i].Length, "", 0);
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// Now run the macro expansion through the supplimentary preprocessor
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Token xt = cpp.Parse (Value);
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Expanding = false;
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// Remove the extra macros we have defined
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for (int j = Args.size() - 1; j >= 0; j--)
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cpp.Undef (Args [j].String, Args [j].Length);
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std::swap(cpp.MacroList, iMacros);
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return xt;
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}
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void CPreprocessor::Error(int iLine, const char *iError, const Token *iToken)
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{
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char line[1000];
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if (iToken)
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snprintf(line, sizeof(line), "line %d: %s: `%.*s'\n",
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iLine, iError, int(iToken->Length), iToken->String);
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else
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snprintf(line, sizeof(line), "line %d: %s\n", iLine, iError);
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}
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CPreprocessor::ErrorHandlerFunc CPreprocessor::ErrorHandler = CPreprocessor::Error;
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CPreprocessor::CPreprocessor (const Token &iToken, int iLine)
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{
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Source = iToken.String;
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SourceEnd = iToken.String + iToken.Length;
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EnableOutput = 1;
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EnableElif = 0;
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Line = iLine;
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BOL = true;
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}
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CPreprocessor::~CPreprocessor() {}
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CPreprocessor::Token CPreprocessor::GetToken (bool iExpand)
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{
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if (Source >= SourceEnd)
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return Token (Token::TK_EOS);
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const char *begin = Source;
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char c = *Source++;
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if (c == '\n' || (c == '\r' && *Source == '\n'))
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{
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Line++;
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BOL = true;
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if (c == '\r')
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Source++;
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return Token (Token::TK_NEWLINE, begin, Source - begin);
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}
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else if (isspace (c))
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{
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while (Source < SourceEnd &&
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*Source != '\r' &&
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*Source != '\n' &&
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isspace (*Source))
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Source++;
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return Token (Token::TK_WHITESPACE, begin, Source - begin);
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}
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else if (isdigit (c))
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{
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BOL = false;
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if (c == '0' && Source < SourceEnd && Source [0] == 'x') // hex numbers
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{
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Source++;
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while (Source < SourceEnd && isxdigit (*Source))
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Source++;
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}
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else
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while (Source < SourceEnd && isdigit (*Source))
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Source++;
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return Token (Token::TK_NUMBER, begin, Source - begin);
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}
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else if (c == '_' || isalnum (c))
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{
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BOL = false;
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while (Source < SourceEnd && (*Source == '_' || isalnum (*Source)))
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Source++;
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Token t (Token::TK_KEYWORD, begin, Source - begin);
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if (iExpand)
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t = ExpandMacro (t);
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return t;
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}
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else if (c == '"' || c == '\'')
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{
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BOL = false;
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while (Source < SourceEnd && *Source != c)
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{
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if (*Source == '\\')
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{
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Source++;
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if (Source >= SourceEnd)
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break;
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}
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if (*Source == '\n')
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Line++;
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Source++;
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}
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if (Source < SourceEnd)
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Source++;
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return Token (Token::TK_STRING, begin, Source - begin);
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}
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else if (c == '/' && *Source == '/')
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{
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BOL = false;
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Source++;
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while (Source < SourceEnd && *Source != '\r' && *Source != '\n')
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Source++;
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return Token (Token::TK_LINECOMMENT, begin, Source - begin);
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}
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else if (c == '/' && *Source == '*')
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{
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BOL = false;
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Source++;
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while (Source < SourceEnd && (Source [0] != '*' || Source [1] != '/'))
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{
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if (*Source == '\n')
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Line++;
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Source++;
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}
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if (Source < SourceEnd && *Source == '*')
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Source++;
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if (Source < SourceEnd && *Source == '/')
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Source++;
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return Token (Token::TK_COMMENT, begin, Source - begin);
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}
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else if (c == '#' && BOL)
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{
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// Skip all whitespaces after '#'
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while (Source < SourceEnd && isspace (*Source))
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Source++;
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while (Source < SourceEnd && !isspace (*Source))
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Source++;
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return Token (Token::TK_DIRECTIVE, begin, Source - begin);
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}
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else if (c == '\\' && Source < SourceEnd && (*Source == '\r' || *Source == '\n'))
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{
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// Treat backslash-newline as a whole token
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if (*Source == '\r')
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Source++;
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if (*Source == '\n')
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Source++;
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Line++;
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BOL = true;
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return Token (Token::TK_LINECONT, begin, Source - begin);
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}
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else
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{
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BOL = false;
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// Handle double-char operators here
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if (c == '>' && (*Source == '>' || *Source == '='))
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Source++;
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else if (c == '<' && (*Source == '<' || *Source == '='))
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Source++;
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else if (c == '!' && *Source == '=')
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Source++;
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else if (c == '=' && *Source == '=')
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Source++;
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else if ((c == '|' || c == '&' || c == '^') && *Source == c)
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Source++;
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return Token (Token::TK_PUNCTUATION, begin, Source - begin);
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}
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}
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CPreprocessor::Macro *CPreprocessor::IsDefined (const Token &iToken)
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{
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for (Macro& cur : MacroList)
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if (cur.Name == iToken)
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return &cur;
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return NULL;
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}
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CPreprocessor::Token CPreprocessor::ExpandMacro (const Token &iToken)
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{
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Macro *cur = IsDefined (iToken);
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if (cur && !cur->Expanding)
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{
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std::vector<Token> args;
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int old_line = Line;
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if (!cur->Args.empty())
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{
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Token t = GetArguments (args, cur->ExpandFunc ? false : true, false);
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if (t.Type == Token::TK_ERROR)
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{
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return t;
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}
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// Put the token back into the source pool; we'll handle it later
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if (t.String)
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{
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// Returned token should never be allocated on heap
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ENSURE(t.Allocated == 0);
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Source = t.String;
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Line -= t.CountNL ();
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}
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}
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if (args.size() > cur->Args.size())
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{
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char tmp [60];
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snprintf (tmp, sizeof (tmp), "Macro `%.*s' passed %zu arguments, but takes just %zu",
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int (cur->Name.Length), cur->Name.String,
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args.size(), cur->Args.size());
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ErrorHandler (old_line, tmp, nullptr);
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return Token (Token::TK_ERROR);
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}
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Token t = cur->ExpandFunc ?
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cur->ExpandFunc (this, args) :
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cur->Expand (args, MacroList);
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t.AppendNL (Line - old_line);
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return t;
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}
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return iToken;
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}
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/**
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* Operator priority:
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* 0: Whole expression
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* 1: '(' ')'
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* 2: ||
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* 3: &&
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* 4: |
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* 5: ^
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* 6: &
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* 7: '==' '!='
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* 8: '<' '<=' '>' '>='
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* 9: '<<' '>>'
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* 10: '+' '-'
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* 11: '*' '/' '%'
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* 12: unary '+' '-' '!' '~'
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*/
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CPreprocessor::Token CPreprocessor::GetExpression (
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Token &oResult, int iLine, int iOpPriority)
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{
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char tmp [40];
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do
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{
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oResult = GetToken (true);
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} while (oResult.Type == Token::TK_WHITESPACE ||
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oResult.Type == Token::TK_NEWLINE ||
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oResult.Type == Token::TK_COMMENT ||
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oResult.Type == Token::TK_LINECOMMENT ||
|
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oResult.Type == Token::TK_LINECONT);
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|
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Token op (Token::TK_WHITESPACE, "", 0);
|
|
|
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// Handle unary operators here
|
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if (oResult.Type == Token::TK_PUNCTUATION && oResult.Length == 1)
|
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{
|
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if (strchr ("+-!~", oResult.String [0]))
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|
{
|
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char uop = oResult.String [0];
|
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op = GetExpression (oResult, iLine, 12);
|
|
long val;
|
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if (!GetValue (oResult, val, iLine))
|
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{
|
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snprintf (tmp, sizeof (tmp), "Unary '%c' not applicable", uop);
|
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ErrorHandler(iLine, tmp, &oResult);
|
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return Token (Token::TK_ERROR);
|
|
}
|
|
|
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if (uop == '-')
|
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oResult.SetValue (-val);
|
|
else if (uop == '!')
|
|
oResult.SetValue (!val);
|
|
else if (uop == '~')
|
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oResult.SetValue (~val);
|
|
}
|
|
else if (oResult.String [0] == '(')
|
|
{
|
|
op = GetExpression (oResult, iLine, 1);
|
|
if (op.Type == Token::TK_ERROR)
|
|
return op;
|
|
if (op.Type == Token::TK_EOS)
|
|
{
|
|
ErrorHandler(iLine, "Unclosed parenthesis in #if expression", nullptr);
|
|
return Token (Token::TK_ERROR);
|
|
}
|
|
|
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ENSURE(op.Type == Token::TK_PUNCTUATION &&
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op.Length == 1 &&
|
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op.String [0] == ')');
|
|
op = GetToken (true);
|
|
}
|
|
}
|
|
|
|
while (op.Type == Token::TK_WHITESPACE ||
|
|
op.Type == Token::TK_NEWLINE ||
|
|
op.Type == Token::TK_COMMENT ||
|
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op.Type == Token::TK_LINECOMMENT ||
|
|
op.Type == Token::TK_LINECONT)
|
|
op = GetToken (true);
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|
|
|
while (true)
|
|
{
|
|
if (op.Type != Token::TK_PUNCTUATION)
|
|
return op;
|
|
|
|
int prio = 0;
|
|
if (op.Length == 1)
|
|
switch (op.String [0])
|
|
{
|
|
case ')': return op;
|
|
case '|': prio = 4; break;
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case '^': prio = 5; break;
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case '&': prio = 6; break;
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case '<':
|
|
case '>': prio = 8; break;
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|
case '+':
|
|
case '-': prio = 10; break;
|
|
case '*':
|
|
case '/':
|
|
case '%': prio = 11; break;
|
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}
|
|
else if (op.Length == 2)
|
|
switch (op.String [0])
|
|
{
|
|
case '|': if (op.String [1] == '|') prio = 2; break;
|
|
case '&': if (op.String [1] == '&') prio = 3; break;
|
|
case '=': if (op.String [1] == '=') prio = 7; break;
|
|
case '!': if (op.String [1] == '=') prio = 7; break;
|
|
case '<':
|
|
if (op.String [1] == '=')
|
|
prio = 8;
|
|
else if (op.String [1] == '<')
|
|
prio = 9;
|
|
break;
|
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case '>':
|
|
if (op.String [1] == '=')
|
|
prio = 8;
|
|
else if (op.String [1] == '>')
|
|
prio = 9;
|
|
break;
|
|
}
|
|
|
|
if (!prio)
|
|
{
|
|
ErrorHandler(iLine, "Expecting operator, got", &op);
|
|
return Token (Token::TK_ERROR);
|
|
}
|
|
|
|
if (iOpPriority >= prio)
|
|
return op;
|
|
|
|
Token rop;
|
|
Token nextop = GetExpression (rop, iLine, prio);
|
|
long vlop, vrop;
|
|
if (!GetValue (oResult, vlop, iLine))
|
|
{
|
|
snprintf (tmp, sizeof (tmp), "Left operand of '%.*s' is not a number",
|
|
int (op.Length), op.String);
|
|
ErrorHandler(iLine, tmp, &oResult);
|
|
return Token (Token::TK_ERROR);
|
|
}
|
|
if (!GetValue (rop, vrop, iLine))
|
|
{
|
|
snprintf (tmp, sizeof (tmp), "Right operand of '%.*s' is not a number",
|
|
int (op.Length), op.String);
|
|
ErrorHandler(iLine, tmp, &rop);
|
|
return Token (Token::TK_ERROR);
|
|
}
|
|
|
|
switch (op.String [0])
|
|
{
|
|
case '|':
|
|
if (prio == 2)
|
|
oResult.SetValue (vlop || vrop);
|
|
else
|
|
oResult.SetValue (vlop | vrop);
|
|
break;
|
|
case '&':
|
|
if (prio == 3)
|
|
oResult.SetValue (vlop && vrop);
|
|
else
|
|
oResult.SetValue (vlop & vrop);
|
|
break;
|
|
case '<':
|
|
if (op.Length == 1)
|
|
oResult.SetValue (vlop < vrop);
|
|
else if (prio == 8)
|
|
oResult.SetValue (vlop <= vrop);
|
|
else if (prio == 9)
|
|
oResult.SetValue (vlop << vrop);
|
|
break;
|
|
case '>':
|
|
if (op.Length == 1)
|
|
oResult.SetValue (vlop > vrop);
|
|
else if (prio == 8)
|
|
oResult.SetValue (vlop >= vrop);
|
|
else if (prio == 9)
|
|
oResult.SetValue (vlop >> vrop);
|
|
break;
|
|
case '^': oResult.SetValue (vlop ^ vrop); break;
|
|
case '!': oResult.SetValue (vlop != vrop); break;
|
|
case '=': oResult.SetValue (vlop == vrop); break;
|
|
case '+': oResult.SetValue (vlop + vrop); break;
|
|
case '-': oResult.SetValue (vlop - vrop); break;
|
|
case '*': oResult.SetValue (vlop * vrop); break;
|
|
case '/':
|
|
case '%':
|
|
if (vrop == 0)
|
|
{
|
|
ErrorHandler(iLine, "Division by zero", nullptr);
|
|
return Token (Token::TK_ERROR);
|
|
}
|
|
if (op.String [0] == '/')
|
|
oResult.SetValue (vlop / vrop);
|
|
else
|
|
oResult.SetValue (vlop % vrop);
|
|
break;
|
|
}
|
|
|
|
op = nextop;
|
|
}
|
|
}
|
|
|
|
|
|
bool CPreprocessor::GetValue (const Token &iToken, long &oValue, int iLine)
|
|
{
|
|
Token r;
|
|
const Token *vt = &iToken;
|
|
|
|
if ((vt->Type == Token::TK_KEYWORD ||
|
|
vt->Type == Token::TK_TEXT ||
|
|
vt->Type == Token::TK_NUMBER) &&
|
|
!vt->String)
|
|
{
|
|
ErrorHandler (iLine, "Trying to evaluate an empty expression", nullptr);
|
|
return false;
|
|
}
|
|
|
|
if (vt->Type == Token::TK_TEXT)
|
|
{
|
|
CPreprocessor cpp (iToken, iLine);
|
|
std::swap(cpp.MacroList, MacroList);
|
|
|
|
Token t;
|
|
t = cpp.GetExpression (r, iLine);
|
|
|
|
std::swap(cpp.MacroList, MacroList);
|
|
|
|
if (t.Type == Token::TK_ERROR)
|
|
return false;
|
|
|
|
if (t.Type != Token::TK_EOS)
|
|
{
|
|
ErrorHandler(iLine, "Garbage after expression", &t);
|
|
return false;
|
|
}
|
|
|
|
vt = &r;
|
|
}
|
|
|
|
Macro *m;
|
|
switch (vt->Type)
|
|
{
|
|
case Token::TK_EOS:
|
|
case Token::TK_ERROR:
|
|
return false;
|
|
|
|
case Token::TK_KEYWORD:
|
|
// Try to expand the macro
|
|
m = IsDefined(*vt);
|
|
if (m != nullptr && !m->Expanding)
|
|
{
|
|
Token x = ExpandMacro (*vt);
|
|
m->Expanding = true;
|
|
bool rc = GetValue (x, oValue, iLine);
|
|
m->Expanding = false;
|
|
return rc;
|
|
}
|
|
|
|
// Undefined macro, "expand" to 0 (mimic cpp behaviour)
|
|
oValue = 0;
|
|
break;
|
|
|
|
case Token::TK_TEXT:
|
|
case Token::TK_NUMBER:
|
|
if (!vt->GetValue (oValue))
|
|
{
|
|
ErrorHandler(iLine, "Not a numeric expression", vt);
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
ErrorHandler(iLine, "Unexpected token", vt);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
CPreprocessor::Token CPreprocessor::GetArgument (Token &oArg, bool iExpand,
|
|
bool shouldAppendArg)
|
|
{
|
|
do
|
|
{
|
|
oArg = GetToken (iExpand);
|
|
} while (oArg.Type == Token::TK_WHITESPACE ||
|
|
oArg.Type == Token::TK_NEWLINE ||
|
|
oArg.Type == Token::TK_COMMENT ||
|
|
oArg.Type == Token::TK_LINECOMMENT ||
|
|
oArg.Type == Token::TK_LINECONT);
|
|
|
|
if (!iExpand)
|
|
{
|
|
if (oArg.Type == Token::TK_EOS)
|
|
return oArg;
|
|
else if (oArg.Type == Token::TK_PUNCTUATION &&
|
|
(oArg.String [0] == ',' ||
|
|
oArg.String [0] == ')'))
|
|
{
|
|
Token t = oArg;
|
|
oArg = Token (Token::TK_TEXT, "", 0);
|
|
return t;
|
|
}
|
|
else if (oArg.Type != Token::TK_KEYWORD)
|
|
{
|
|
ErrorHandler(Line, "Unexpected token", &oArg);
|
|
return Token (Token::TK_ERROR);
|
|
}
|
|
}
|
|
|
|
size_t braceCount = 0;
|
|
|
|
if( oArg.Type == Token::TK_PUNCTUATION && oArg.String[0] == '(' )
|
|
++braceCount;
|
|
|
|
size_t len = oArg.Length;
|
|
while (true)
|
|
{
|
|
Token t = GetToken (iExpand);
|
|
switch (t.Type)
|
|
{
|
|
case Token::TK_EOS:
|
|
ErrorHandler(Line, "Unfinished list of arguments", nullptr);
|
|
FALLTHROUGH;
|
|
case Token::TK_ERROR:
|
|
return Token (Token::TK_ERROR);
|
|
case Token::TK_PUNCTUATION:
|
|
if( t.String [0] == '(' )
|
|
{
|
|
++braceCount;
|
|
}
|
|
else if( !braceCount )
|
|
{
|
|
if (t.String [0] == ',' ||
|
|
t.String [0] == ')')
|
|
{
|
|
// Trim whitespaces at the end
|
|
oArg.Length = len;
|
|
|
|
//Append "__arg_" to all macro arguments, otherwise if user does:
|
|
// #define mad( a, b, c ) fma( a, b, c )
|
|
// mad( x.s, y, a );
|
|
//It will be translated to:
|
|
// fma( x.s, y, x.s );
|
|
//instead of:
|
|
// fma( x.s, y, a );
|
|
//This does not fix the problem by the root, but
|
|
//typing "__arg_" by the user is extremely rare.
|
|
if( shouldAppendArg )
|
|
oArg.Append( "__arg_", 6 );
|
|
return t;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if( t.String [0] == ')' )
|
|
--braceCount;
|
|
}
|
|
break;
|
|
case Token::TK_LINECONT:
|
|
case Token::TK_COMMENT:
|
|
case Token::TK_LINECOMMENT:
|
|
case Token::TK_NEWLINE:
|
|
// ignore these tokens
|
|
continue;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (!iExpand && t.Type != Token::TK_WHITESPACE)
|
|
{
|
|
ErrorHandler(Line, "Unexpected token", &oArg);
|
|
return Token (Token::TK_ERROR);
|
|
}
|
|
|
|
oArg.Append (t);
|
|
|
|
if (t.Type != Token::TK_WHITESPACE)
|
|
len = oArg.Length;
|
|
}
|
|
}
|
|
|
|
|
|
CPreprocessor::Token CPreprocessor::GetArguments (std::vector<Token>& oArgs,
|
|
bool iExpand, bool shouldAppendArg)
|
|
{
|
|
Token args [MAX_MACRO_ARGS];
|
|
int nargs = 0;
|
|
|
|
// Suppose we'll leave by the wrong path
|
|
oArgs.clear();
|
|
|
|
bool isFirstTokenParsed = false;
|
|
bool isFirstTokenNotAnOpenBrace = false;
|
|
|
|
Token t;
|
|
do
|
|
{
|
|
t = GetToken (iExpand);
|
|
|
|
if( !isFirstTokenParsed &&
|
|
(t.Type != Token::TK_PUNCTUATION || t.String [0] != '(') )
|
|
{
|
|
isFirstTokenNotAnOpenBrace = true;
|
|
}
|
|
isFirstTokenParsed = true;
|
|
} while (t.Type == Token::TK_WHITESPACE ||
|
|
t.Type == Token::TK_COMMENT ||
|
|
t.Type == Token::TK_LINECOMMENT);
|
|
|
|
if( isFirstTokenNotAnOpenBrace )
|
|
{
|
|
oArgs.clear();
|
|
return t;
|
|
}
|
|
|
|
while (true)
|
|
{
|
|
if (nargs == MAX_MACRO_ARGS)
|
|
{
|
|
ErrorHandler(Line, "Too many arguments to macro", nullptr);
|
|
return Token (Token::TK_ERROR);
|
|
}
|
|
|
|
t = GetArgument (args [nargs++], iExpand, shouldAppendArg);
|
|
|
|
switch (t.Type)
|
|
{
|
|
case Token::TK_EOS:
|
|
ErrorHandler(Line, "Unfinished list of arguments", nullptr);
|
|
FALLTHROUGH;
|
|
case Token::TK_ERROR:
|
|
return Token (Token::TK_ERROR);
|
|
|
|
case Token::TK_PUNCTUATION:
|
|
if (t.String [0] == ')')
|
|
{
|
|
t = GetToken (iExpand);
|
|
goto Done;
|
|
} // otherwise we've got a ','
|
|
break;
|
|
|
|
default:
|
|
ErrorHandler(Line, "Unexpected token", &t);
|
|
break;
|
|
}
|
|
}
|
|
|
|
Done:
|
|
oArgs.insert(oArgs.begin(), args, args + nargs);
|
|
return t;
|
|
}
|
|
|
|
|
|
bool CPreprocessor::HandleDefine (Token &iBody, int iLine)
|
|
{
|
|
// Create an additional preprocessor to process macro body
|
|
CPreprocessor cpp (iBody, iLine);
|
|
|
|
Token t = cpp.GetToken (false);
|
|
if (t.Type != Token::TK_KEYWORD)
|
|
{
|
|
ErrorHandler(iLine, "Macro name expected after #define", nullptr);
|
|
return false;
|
|
}
|
|
|
|
Macro m(t);
|
|
m.Body = iBody;
|
|
t = cpp.GetArguments (m.Args, false, true);
|
|
while (t.Type == Token::TK_WHITESPACE)
|
|
t = cpp.GetToken (false);
|
|
|
|
switch (t.Type)
|
|
{
|
|
case Token::TK_NEWLINE:
|
|
case Token::TK_EOS:
|
|
// Assign "" to token
|
|
t = Token (Token::TK_TEXT, "", 0);
|
|
break;
|
|
|
|
case Token::TK_ERROR:
|
|
return false;
|
|
|
|
default:
|
|
t.Type = Token::TK_TEXT;
|
|
ENSURE(t.String + t.Length == cpp.Source);
|
|
t.Length = cpp.SourceEnd - t.String;
|
|
break;
|
|
}
|
|
|
|
if( !m.Args.empty() )
|
|
{
|
|
CPreprocessor cpp2;
|
|
|
|
//We need to convert:
|
|
// #define mad( a__arg_, b__arg_, c__arg_ ) fma( a, b, c )
|
|
//into:
|
|
// #define mad( a__arg_, b__arg_, c__arg_ ) fma( a__arg_, b__arg_, c__arg_ )
|
|
for (const Token& arg : m.Args)
|
|
{
|
|
cpp2.Define(arg.String, arg.Length - 6, arg.String, arg.Length);
|
|
}
|
|
|
|
// Now run the macro expansion through the supplimentary preprocessor
|
|
Token xt = cpp2.Parse( t );
|
|
t = xt;
|
|
}
|
|
|
|
m.Value = t;
|
|
MacroList.push_front(std::move(m));
|
|
return true;
|
|
}
|
|
|
|
|
|
bool CPreprocessor::HandleUnDef (Token &iBody, int iLine)
|
|
{
|
|
CPreprocessor cpp (iBody, iLine);
|
|
|
|
Token t = cpp.GetToken (false);
|
|
|
|
if (t.Type != Token::TK_KEYWORD)
|
|
{
|
|
ErrorHandler(iLine, "Expecting a macro name after #undef, got", &t);
|
|
return false;
|
|
}
|
|
|
|
// Don't barf if macro does not exist - standard C behaviour
|
|
Undef (t.String, t.Length);
|
|
|
|
do
|
|
{
|
|
t = cpp.GetToken (false);
|
|
} while (t.Type == Token::TK_WHITESPACE ||
|
|
t.Type == Token::TK_COMMENT ||
|
|
t.Type == Token::TK_LINECOMMENT);
|
|
|
|
if (t.Type != Token::TK_EOS)
|
|
ErrorHandler(iLine, "Warning: Ignoring garbage after directive", &t);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool CPreprocessor::HandleIf(bool val, int iLine)
|
|
{
|
|
if (EnableOutput & (1 << 31))
|
|
{
|
|
ErrorHandler(iLine, "Too many embedded #if directives", nullptr);
|
|
return false;
|
|
}
|
|
|
|
EnableElif <<= 1;
|
|
EnableOutput <<= 1;
|
|
if (val)
|
|
EnableOutput |= 1;
|
|
else
|
|
EnableElif |= 1;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool CPreprocessor::HandleIfDef (Token &iBody, int iLine)
|
|
{
|
|
CPreprocessor cpp (iBody, iLine);
|
|
|
|
Token t = cpp.GetToken (false);
|
|
|
|
if (t.Type != Token::TK_KEYWORD)
|
|
{
|
|
ErrorHandler(iLine, "Expecting a macro name after #ifdef, got", &t);
|
|
return false;
|
|
}
|
|
|
|
if (!HandleIf(IsDefined(t) != nullptr, iLine))
|
|
return false;
|
|
|
|
do
|
|
{
|
|
t = cpp.GetToken (false);
|
|
} while (t.Type == Token::TK_WHITESPACE ||
|
|
t.Type == Token::TK_COMMENT ||
|
|
t.Type == Token::TK_LINECOMMENT);
|
|
|
|
if (t.Type != Token::TK_EOS)
|
|
ErrorHandler(iLine, "Warning: Ignoring garbage after directive", &t);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
CPreprocessor::Token CPreprocessor::ExpandDefined (CPreprocessor *iParent, const std::vector<Token>& iArgs)
|
|
{
|
|
if (iArgs.size() != 1)
|
|
{
|
|
iParent->ErrorHandler(iParent->Line, "The defined() function takes exactly one argument", nullptr);
|
|
return Token (Token::TK_ERROR);
|
|
}
|
|
|
|
const char *v = iParent->IsDefined (iArgs [0]) ? "1" : "0";
|
|
return Token (Token::TK_NUMBER, v, 1);
|
|
}
|
|
|
|
bool CPreprocessor::GetValueDef(const Token &iToken, long &oValue, int iLine)
|
|
{
|
|
// Temporary add the defined() function to the macro list
|
|
MacroList.emplace_front(Token(Token::TK_KEYWORD, "defined", 7));
|
|
MacroList.front().ExpandFunc = ExpandDefined;
|
|
MacroList.front().Args.resize(1);
|
|
|
|
bool rc = GetValue (iToken, oValue, iLine);
|
|
|
|
// Restore the macro list
|
|
MacroList.pop_front();
|
|
|
|
return rc;
|
|
}
|
|
|
|
bool CPreprocessor::HandleIf (Token &iBody, int iLine)
|
|
{
|
|
long val;
|
|
return GetValueDef(iBody, val, iLine) && HandleIf(val != 0, iLine);
|
|
}
|
|
|
|
bool CPreprocessor::HandleElif (Token &iBody, int iLine)
|
|
{
|
|
if (EnableOutput == 1)
|
|
{
|
|
ErrorHandler(iLine, "#elif without #if", nullptr);
|
|
return false;
|
|
}
|
|
|
|
long val;
|
|
if (!GetValueDef(iBody, val, iLine))
|
|
return false;
|
|
|
|
if (val && (EnableElif & 1))
|
|
{
|
|
EnableOutput |= 1;
|
|
EnableElif &= ~1;
|
|
}
|
|
else
|
|
EnableOutput &= ~1;
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
bool CPreprocessor::HandleElse (Token &iBody, int iLine)
|
|
{
|
|
if (EnableOutput == 1)
|
|
{
|
|
ErrorHandler(iLine, "#else without #if", nullptr);
|
|
return false;
|
|
}
|
|
|
|
// Negate the result of last #if
|
|
if ((EnableElif & 1) || (EnableOutput & 1))
|
|
EnableOutput ^= 1;
|
|
|
|
if (iBody.Length)
|
|
ErrorHandler(iLine, "Warning: Ignoring garbage after #else", &iBody);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
bool CPreprocessor::HandleEndIf (Token &iBody, int iLine)
|
|
{
|
|
EnableElif >>= 1;
|
|
EnableOutput >>= 1;
|
|
if (EnableOutput == 0)
|
|
{
|
|
ErrorHandler(iLine, "#endif without #if", nullptr);
|
|
return false;
|
|
}
|
|
|
|
if (iBody.Length)
|
|
ErrorHandler(iLine, "Warning: Ignoring garbage after #endif", &iBody);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
CPreprocessor::Token CPreprocessor::HandleDirective (Token &iToken, int iLine)
|
|
{
|
|
// Analyze preprocessor directive
|
|
const char *directive = iToken.String + 1;
|
|
size_t dirlen = iToken.Length - 1;
|
|
while (dirlen && isspace (*directive))
|
|
dirlen--, directive++;
|
|
|
|
int old_line = Line;
|
|
|
|
// Collect the remaining part of the directive until EOL
|
|
Token t, last;
|
|
do
|
|
{
|
|
t = GetToken (false);
|
|
if (t.Type == Token::TK_NEWLINE)
|
|
{
|
|
// No directive arguments
|
|
last = t;
|
|
t.Length = 0;
|
|
goto Done;
|
|
}
|
|
} while (t.Type == Token::TK_WHITESPACE ||
|
|
t.Type == Token::TK_LINECONT ||
|
|
t.Type == Token::TK_COMMENT ||
|
|
t.Type == Token::TK_LINECOMMENT);
|
|
|
|
for (;;)
|
|
{
|
|
last = GetToken (false);
|
|
switch (last.Type)
|
|
{
|
|
case Token::TK_EOS:
|
|
// Can happen and is not an error
|
|
goto Done;
|
|
|
|
case Token::TK_LINECOMMENT:
|
|
case Token::TK_COMMENT:
|
|
// Skip comments in macros
|
|
continue;
|
|
|
|
case Token::TK_ERROR:
|
|
return last;
|
|
|
|
case Token::TK_LINECONT:
|
|
continue;
|
|
|
|
case Token::TK_NEWLINE:
|
|
goto Done;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
t.Append (last);
|
|
t.Type = Token::TK_TEXT;
|
|
}
|
|
Done:
|
|
|
|
#define IS_DIRECTIVE(s) \
|
|
(dirlen == strlen(s) && (strncmp (directive, s, dirlen) == 0))
|
|
|
|
bool outputEnabled = ((EnableOutput & (EnableOutput + 1)) == 0);
|
|
bool rc;
|
|
|
|
if (IS_DIRECTIVE ("define") && outputEnabled)
|
|
rc = HandleDefine (t, iLine);
|
|
else if (IS_DIRECTIVE ("undef") && outputEnabled)
|
|
rc = HandleUnDef (t, iLine);
|
|
else if (IS_DIRECTIVE ("ifdef"))
|
|
rc = HandleIfDef (t, iLine);
|
|
else if (IS_DIRECTIVE ("ifndef"))
|
|
{
|
|
rc = HandleIfDef (t, iLine);
|
|
if (rc)
|
|
{
|
|
EnableOutput ^= 1;
|
|
EnableElif ^= 1;
|
|
}
|
|
}
|
|
else if (IS_DIRECTIVE ("if"))
|
|
rc = HandleIf (t, iLine);
|
|
else if (IS_DIRECTIVE ("elif"))
|
|
rc = HandleElif (t, iLine);
|
|
|
|
else if (IS_DIRECTIVE ("else"))
|
|
rc = HandleElse (t, iLine);
|
|
else if (IS_DIRECTIVE ("endif"))
|
|
rc = HandleEndIf (t, iLine);
|
|
else
|
|
{
|
|
// Unknown preprocessor directive, roll back and pass through
|
|
Line = old_line;
|
|
Source = iToken.String + iToken.Length;
|
|
iToken.Type = Token::TK_TEXT;
|
|
return iToken;
|
|
}
|
|
|
|
#undef IS_DIRECTIVE
|
|
|
|
if (!rc)
|
|
return Token (Token::TK_ERROR);
|
|
return last;
|
|
}
|
|
|
|
|
|
void CPreprocessor::Define (const char *iMacroName, size_t iMacroNameLen,
|
|
const char *iMacroValue, size_t iMacroValueLen)
|
|
{
|
|
MacroList.emplace_front(Token(Token::TK_KEYWORD, iMacroName, iMacroNameLen));
|
|
MacroList.front().Value = Token(Token::TK_TEXT, iMacroValue, iMacroValueLen);
|
|
}
|
|
|
|
|
|
void CPreprocessor::Define (const char *iMacroName, size_t iMacroNameLen,
|
|
long iMacroValue)
|
|
{
|
|
MacroList.emplace_front(Token(Token::TK_KEYWORD, iMacroName, iMacroNameLen));
|
|
MacroList.front().Value.SetValue(iMacroValue);
|
|
}
|
|
|
|
|
|
bool CPreprocessor::Undef (const char *iMacroName, size_t iMacroNameLen)
|
|
{
|
|
Token name (Token::TK_KEYWORD, iMacroName, iMacroNameLen);
|
|
|
|
for (auto it = MacroList.before_begin();; ++it)
|
|
{
|
|
auto itpp = std::next(it);
|
|
if(itpp == MacroList.end()) break;
|
|
|
|
if (itpp->Name == name)
|
|
{
|
|
MacroList.erase_after(it);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
CPreprocessor::Token CPreprocessor::Parse (const Token &iSource)
|
|
{
|
|
Source = iSource.String;
|
|
SourceEnd = Source + iSource.Length;
|
|
Line = 1;
|
|
BOL = true;
|
|
EnableOutput = 1;
|
|
EnableElif = 0;
|
|
|
|
// Accumulate output into this token
|
|
Token output (Token::TK_TEXT);
|
|
int empty_lines = 0;
|
|
|
|
// Enable output only if all embedded #if's were true
|
|
bool old_output_enabled = true;
|
|
bool output_enabled = true;
|
|
int output_disabled_line = 0;
|
|
|
|
while (Source < SourceEnd)
|
|
{
|
|
int old_line = Line;
|
|
Token t = GetToken (true);
|
|
|
|
NextToken:
|
|
switch (t.Type)
|
|
{
|
|
case Token::TK_ERROR:
|
|
return t;
|
|
|
|
case Token::TK_EOS:
|
|
return output; // Force termination
|
|
|
|
case Token::TK_COMMENT:
|
|
// C comments are replaced with single spaces.
|
|
if (output_enabled)
|
|
{
|
|
output.Append (" ", 1);
|
|
output.AppendNL (Line - old_line);
|
|
}
|
|
break;
|
|
|
|
case Token::TK_LINECOMMENT:
|
|
// C++ comments are ignored
|
|
continue;
|
|
|
|
case Token::TK_DIRECTIVE:
|
|
// Handle preprocessor directives
|
|
t = HandleDirective (t, old_line);
|
|
|
|
output_enabled = ((EnableOutput & (EnableOutput + 1)) == 0);
|
|
if (output_enabled != old_output_enabled)
|
|
{
|
|
if (output_enabled)
|
|
output.AppendNL (old_line - output_disabled_line);
|
|
else
|
|
output_disabled_line = old_line;
|
|
old_output_enabled = output_enabled;
|
|
}
|
|
|
|
if (output_enabled)
|
|
output.AppendNL (Line - old_line - t.CountNL ());
|
|
goto NextToken;
|
|
|
|
case Token::TK_LINECONT:
|
|
// Backslash-Newline sequences are deleted, no matter where.
|
|
empty_lines++;
|
|
break;
|
|
|
|
case Token::TK_NEWLINE:
|
|
if (empty_lines)
|
|
{
|
|
// Compensate for the backslash-newline combinations
|
|
// we have encountered, otherwise line numeration is broken
|
|
if (output_enabled)
|
|
output.AppendNL (empty_lines);
|
|
empty_lines = 0;
|
|
}
|
|
FALLTHROUGH; // to default
|
|
case Token::TK_WHITESPACE:
|
|
// Fallthrough to default
|
|
default:
|
|
// Passthrough all other tokens
|
|
if (output_enabled)
|
|
output.Append (t);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (EnableOutput != 1)
|
|
{
|
|
ErrorHandler(Line, "Unclosed #if at end of source", nullptr);
|
|
return Token (Token::TK_ERROR);
|
|
}
|
|
|
|
return output;
|
|
}
|
|
|
|
|
|
char *CPreprocessor::Parse (const char *iSource, size_t iLength, size_t &oLength)
|
|
{
|
|
Token retval = Parse (Token (Token::TK_TEXT, iSource, iLength));
|
|
if (retval.Type == Token::TK_ERROR)
|
|
return NULL;
|
|
|
|
oLength = retval.Length;
|
|
retval.Allocated = 0;
|
|
return retval.Buffer;
|
|
}
|
|
|
|
} // namespace Ogre
|