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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QV4ISEL_UTIL_P_H
#define QV4ISEL_UTIL_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "private/qv4value_p.h"
#include "qv4jsir_p.h"
QT_BEGIN_NAMESPACE
namespace QV4 {
inline bool canConvertToSignedInteger(double value)
{
int ival = (int) value;
// +0 != -0, so we need to convert to double when negating 0
return ival == value && !(value == 0 && isNegative(value));
}
inline bool canConvertToUnsignedInteger(double value)
{
unsigned uval = (unsigned) value;
// +0 != -0, so we need to convert to double when negating 0
return uval == value && !(value == 0 && isNegative(value));
}
inline Primitive convertToValue(IR::Const *c)
{
switch (c->type) {
case IR::MissingType:
return Primitive::emptyValue();
case IR::NullType:
return Primitive::nullValue();
case IR::UndefinedType:
return Primitive::undefinedValue();
case IR::BoolType:
return Primitive::fromBoolean(c->value != 0);
case IR::SInt32Type:
return Primitive::fromInt32(int(c->value));
case IR::UInt32Type:
return Primitive::fromUInt32(unsigned(c->value));
case IR::DoubleType:
return Primitive::fromDouble(c->value);
case IR::NumberType: {
int ival = (int)c->value;
if (canConvertToSignedInteger(c->value)) {
return Primitive::fromInt32(ival);
} else {
return Primitive::fromDouble(c->value);
}
}
default:
Q_UNREACHABLE();
}
// unreachable, but the function must return something
return Primitive::undefinedValue();
}
class ConvertTemps: protected IR::StmtVisitor, protected IR::ExprVisitor
{
void renumber(IR::Temp *t)
{
if (t->kind != IR::Temp::VirtualRegister)
return;
int stackSlot = _stackSlotForTemp.value(t->index, -1);
if (stackSlot == -1) {
stackSlot = allocateFreeSlot();
_stackSlotForTemp[t->index] = stackSlot;
}
t->kind = IR::Temp::StackSlot;
t->index = stackSlot;
}
protected:
int _nextUnusedStackSlot;
QHash<int, int> _stackSlotForTemp;
IR::BasicBlock *_currentBasicBlock;
virtual int allocateFreeSlot()
{
return _nextUnusedStackSlot++;
}
virtual void process(IR::Stmt *s)
{
s->accept(this);
}
public:
ConvertTemps()
: _nextUnusedStackSlot(0)
, _currentBasicBlock(0)
{}
void toStackSlots(IR::Function *function)
{
_stackSlotForTemp.reserve(function->tempCount);
foreach (IR::BasicBlock *bb, function->basicBlocks()) {
if (bb->isRemoved())
continue;
_currentBasicBlock = bb;
foreach (IR::Stmt *s, bb->statements())
process(s);
}
function->tempCount = _nextUnusedStackSlot;
}
protected:
virtual void visitConst(IR::Const *) {}
virtual void visitString(IR::String *) {}
virtual void visitRegExp(IR::RegExp *) {}
virtual void visitName(IR::Name *) {}
virtual void visitTemp(IR::Temp *e) { renumber(e); }
virtual void visitArgLocal(IR::ArgLocal *) {}
virtual void visitClosure(IR::Closure *) {}
virtual void visitConvert(IR::Convert *e) { e->expr->accept(this); }
virtual void visitUnop(IR::Unop *e) { e->expr->accept(this); }
virtual void visitBinop(IR::Binop *e) { e->left->accept(this); e->right->accept(this); }
virtual void visitCall(IR::Call *e) {
e->base->accept(this);
for (IR::ExprList *it = e->args; it; it = it->next)
it->expr->accept(this);
}
virtual void visitNew(IR::New *e) {
e->base->accept(this);
for (IR::ExprList *it = e->args; it; it = it->next)
it->expr->accept(this);
}
virtual void visitSubscript(IR::Subscript *e) { e->base->accept(this); e->index->accept(this); }
virtual void visitMember(IR::Member *e) { e->base->accept(this); }
virtual void visitExp(IR::Exp *s) { s->expr->accept(this); }
virtual void visitMove(IR::Move *s) { s->target->accept(this); s->source->accept(this); }
virtual void visitJump(IR::Jump *) {}
virtual void visitCJump(IR::CJump *s) { s->cond->accept(this); }
virtual void visitRet(IR::Ret *s) { s->expr->accept(this); }
virtual void visitPhi(IR::Phi *) { Q_UNREACHABLE(); }
};
} // namespace QV4
QT_END_NAMESPACE
#endif // QV4ISEL_UTIL_P_H
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