forked from qt-creator/qt-creator
8eac3fba80
At some point in the preprocessing stage, some tokens get "squeezed", so their associated string no longer refers to the document content, but only to their own symbol. However, there is at least one context that operated under the assumption that the token's offset still pointed into the "global" string. As the token's offset is zero after parsing, this lead to the same piece of code being preprocessed in an infinite loop. Fixes: QTCREATORBUG-19525 Change-Id: I231ba51811cfa0b5c6dfe7f75fe0384472252c6f Reviewed-by: Christian Stenger <christian.stenger@qt.io>
149 lines
4.2 KiB
C++
149 lines
4.2 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of Qt Creator.
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**
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 as published by the Free Software
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** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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****************************************************************************/
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#pragma once
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#include <cplusplus/CPlusPlus.h>
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#include <cplusplus/Token.h>
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#include <QByteArray>
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namespace CPlusPlus {
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class CPLUSPLUS_EXPORT ByteArrayRef
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{
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public:
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ByteArrayRef()
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: m_start("")
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, m_length(0)
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{}
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ByteArrayRef(const QByteArray *ref)
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: m_start(ref->constData())
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, m_length(ref->length())
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{}
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ByteArrayRef(const char *start, int length)
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: m_start(start)
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, m_length(length)
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{}
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ByteArrayRef(const QByteArray *ref, int offset, int length)
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: m_start(ref->constData() + offset)
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, m_length(length)
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{}
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inline const char *start() const
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{ return m_start; }
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inline int length() const
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{ return m_length; }
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inline int size() const
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{ return length(); }
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inline char at(int pos) const
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{ return pos >= 0 && pos < m_length ? m_start[pos] : '\0'; }
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inline char operator[](int pos) const
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{ return at(pos); }
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QByteArray toByteArray() const
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{ return QByteArray(m_start, m_length); }
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bool operator==(const QByteArray &other) const
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{ return m_length == other.length() && !qstrncmp(m_start, other.constData(), m_length); }
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bool operator!=(const QByteArray &other) const
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{ return !this->operator==(other); }
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bool operator==(const char *other) const
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{ return m_length == (int) qstrlen(other) && !qstrncmp(m_start, other, m_length); }
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bool operator!=(const char *other) const
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{ return !this->operator==(other); }
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bool startsWith(const char *ch) const;
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int count(char c) const;
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private:
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const char *m_start;
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const int m_length;
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};
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inline bool operator==(const QByteArray &other, const ByteArrayRef &ref)
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{ return ref == other; }
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inline bool operator!=(const QByteArray &other, const ByteArrayRef &ref)
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{ return ref != other; }
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namespace Internal {
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class CPLUSPLUS_EXPORT PPToken: public Token
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{
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public:
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PPToken() {}
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PPToken(const QByteArray &src)
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: m_src(src)
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{}
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void setSource(const QByteArray &src)
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{ m_src = src; }
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const QByteArray &source() const
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{ return m_src; }
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bool hasSource() const
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{ return !m_src.isEmpty(); }
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void squeezeSource();
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const char *bufferStart() const
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{ return m_src.constData(); }
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const char *tokenStart() const
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{ return bufferStart() + byteOffset; }
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ByteArrayRef asByteArrayRef() const
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{ return ByteArrayRef(&m_src, byteOffset, bytes()); }
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unsigned originalOffset() const
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{ return m_originalOffset != -1 ? m_originalOffset : byteOffset; }
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private:
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QByteArray m_src;
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// TODO: We may or may not be able to get rid of this member. In order to find out,
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// all code calling this class' accessors (including the parent class'
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// bytes* and utf16* functions) has to be looked at. Essentially, it boils
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// down to whether there are contexts where an object of this class is used
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// and the original "global" string is no longer available. (If not, then the
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// m_src member would also not be needed.)
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int m_originalOffset = -1;
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};
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} // namespace Internal
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} // namespace CPlusPlus
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