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/*
 *    Stack-less Just-In-Time compiler
 *
 *    Copyright Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright notice, this list of
 *      conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright notice, this list
 *      of conditions and the following disclaimer in the documentation and/or other materials
 *      provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

static sljit_s32 load_immediate(struct sljit_compiler *compiler, sljit_s32 dst_r, sljit_sw imm, sljit_s32 tmp_r)
{
	SLJIT_UNUSED_ARG(tmp_r);
	SLJIT_ASSERT(dst_r != tmp_r);

	if (imm <= SIMM_MAX && imm >= SIMM_MIN)
		return push_inst(compiler, ADDI | RD(dst_r) | RS1(TMP_ZERO) | IMM_I(imm));

	if (imm & 0x800)
		imm += 0x1000;

	FAIL_IF(push_inst(compiler, LUI | RD(dst_r) | (sljit_ins)(imm & ~0xfff)));

	if ((imm & 0xfff) == 0)
		return SLJIT_SUCCESS;

	return push_inst(compiler, ADDI | RD(dst_r) | RS1(dst_r) | IMM_I(imm));
}

static SLJIT_INLINE sljit_s32 emit_const(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw init_value, sljit_ins last_ins)
{
	if ((init_value & 0x800) != 0)
		init_value += 0x1000;

	FAIL_IF(push_inst(compiler, LUI | RD(dst) | (sljit_ins)(init_value & ~0xfff)));
	return push_inst(compiler, last_ins | RS1(dst) | IMM_I(init_value));
}

SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_target, sljit_sw executable_offset)
{
	sljit_ins *inst = (sljit_ins*)addr;
	SLJIT_UNUSED_ARG(executable_offset);

	if ((new_target & 0x800) != 0)
		new_target += 0x1000;

	SLJIT_UPDATE_WX_FLAGS(inst, inst + 5, 0);

	SLJIT_ASSERT((inst[0] & 0x7f) == LUI);
	inst[0] = (inst[0] & 0xfff) | (sljit_ins)((sljit_sw)new_target & ~0xfff);
	SLJIT_ASSERT((inst[1] & 0x707f) == ADDI || (inst[1] & 0x707f) == JALR);
	inst[1] = (inst[1] & 0xfffff) | IMM_I(new_target);

	SLJIT_UPDATE_WX_FLAGS(inst, inst + 5, 1);
	inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
	SLJIT_CACHE_FLUSH(inst, inst + 5);
}
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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtOpenGL module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qglengineshadermanager_p.h"
#include "qglengineshadersource_p.h"
#include "qpaintengineex_opengl2_p.h"
#include "qglshadercache_p.h"

#include <QtGui/private/qopenglcontext_p.h>

#if defined(QT_DEBUG)
#include <QMetaEnum>
#endif

// #define QT_GL_SHARED_SHADER_DEBUG

QT_BEGIN_NAMESPACE

class QGLEngineSharedShadersResource : public QOpenGLSharedResource
{
public:
    QGLEngineSharedShadersResource(QOpenGLContext *ctx)
        : QOpenGLSharedResource(ctx->shareGroup())
        , m_shaders(new QGLEngineSharedShaders(QGLContext::fromOpenGLContext(ctx)))
    {
    }

    ~QGLEngineSharedShadersResource()
    {
        delete m_shaders;
    }

    void invalidateResource()
    {
        delete m_shaders;
        m_shaders = 0;
    }

    void freeResource(QOpenGLContext *)
    {
    }

    QGLEngineSharedShaders *shaders() const { return m_shaders; }

private:
    QGLEngineSharedShaders *m_shaders;
};

class QGLShaderStorage
{
public:
    QGLEngineSharedShaders *shadersForThread(const QGLContext *context) {
        QOpenGLMultiGroupSharedResource *&shaders = m_storage.localData();
        if (!shaders)
            shaders = new QOpenGLMultiGroupSharedResource;
        QGLEngineSharedShadersResource *resource =
            shaders->value<QGLEngineSharedShadersResource>(context->contextHandle());
        return resource ? resource->shaders() : 0;
    }

private:
    QThreadStorage<QOpenGLMultiGroupSharedResource *> m_storage;
};

Q_GLOBAL_STATIC(QGLShaderStorage, qt_shader_storage);

QGLEngineSharedShaders *QGLEngineSharedShaders::shadersForContext(const QGLContext *context)
{
    return qt_shader_storage()->shadersForThread(context);
}

const char* QGLEngineSharedShaders::qShaderSnippets[] = {
    0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0
};

QGLEngineSharedShaders::QGLEngineSharedShaders(const QGLContext* context)
    : blitShaderProg(0)
    , simpleShaderProg(0)
{

/*
    Rather than having the shader source array statically initialised, it is initialised
    here instead. This is to allow new shader names to be inserted or existing names moved
    around without having to change the order of the glsl strings. It is hoped this will
    make future hard-to-find runtime bugs more obvious and generally give more solid code.
*/
    static bool snippetsPopulated = false;
    if (!snippetsPopulated) {

        const char** code = qShaderSnippets; // shortcut

        code[MainVertexShader] = qglslMainVertexShader;
        code[MainWithTexCoordsVertexShader] = qglslMainWithTexCoordsVertexShader;
        code[MainWithTexCoordsAndOpacityVertexShader] = qglslMainWithTexCoordsAndOpacityVertexShader;

        code[UntransformedPositionVertexShader] = qglslUntransformedPositionVertexShader;
        code[PositionOnlyVertexShader] = qglslPositionOnlyVertexShader;
        code[ComplexGeometryPositionOnlyVertexShader] = qglslComplexGeometryPositionOnlyVertexShader;
        code[PositionWithPatternBrushVertexShader] = qglslPositionWithPatternBrushVertexShader;
        code[PositionWithLinearGradientBrushVertexShader] = qglslPositionWithLinearGradientBrushVertexShader;
        code[PositionWithConicalGradientBrushVertexShader] = qglslPositionWithConicalGradientBrushVertexShader;
        code[PositionWithRadialGradientBrushVertexShader] = qglslPositionWithRadialGradientBrushVertexShader;
        code[PositionWithTextureBrushVertexShader] = qglslPositionWithTextureBrushVertexShader;
        code[AffinePositionWithPatternBrushVertexShader] = qglslAffinePositionWithPatternBrushVertexShader;
        code[AffinePositionWithLinearGradientBrushVertexShader] = qglslAffinePositionWithLinearGradientBrushVertexShader;
        code[AffinePositionWithConicalGradientBrushVertexShader] = qglslAffinePositionWithConicalGradientBrushVertexShader;
        code[AffinePositionWithRadialGradientBrushVertexShader] = qglslAffinePositionWithRadialGradientBrushVertexShader;
        code[AffinePositionWithTextureBrushVertexShader] = qglslAffinePositionWithTextureBrushVertexShader;

        code[MainFragmentShader_CMO] = qglslMainFragmentShader_CMO;
        code[MainFragmentShader_CM] = qglslMainFragmentShader_CM;
        code[MainFragmentShader_MO] = qglslMainFragmentShader_MO;
        code[MainFragmentShader_M] = qglslMainFragmentShader_M;
        code[MainFragmentShader_CO] = qglslMainFragmentShader_CO;
        code[MainFragmentShader_C] = qglslMainFragmentShader_C;
        code[MainFragmentShader_O] = qglslMainFragmentShader_O;
        code[MainFragmentShader] = qglslMainFragmentShader;
        code[MainFragmentShader_ImageArrays] = qglslMainFragmentShader_ImageArrays;

        code[ImageSrcFragmentShader] = qglslImageSrcFragmentShader;
        code[ImageSrcWithPatternFragmentShader] = qglslImageSrcWithPatternFragmentShader;
        code[NonPremultipliedImageSrcFragmentShader] = qglslNonPremultipliedImageSrcFragmentShader;
        code[CustomImageSrcFragmentShader] = qglslCustomSrcFragmentShader; // Calls "customShader", which must be appended
        code[SolidBrushSrcFragmentShader] = qglslSolidBrushSrcFragmentShader;
        code[TextureBrushSrcFragmentShader] = qglslTextureBrushSrcFragmentShader;
        code[TextureBrushSrcWithPatternFragmentShader] = qglslTextureBrushSrcWithPatternFragmentShader;
        code[PatternBrushSrcFragmentShader] = qglslPatternBrushSrcFragmentShader;