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/*
* Copyright (C) 2016-2017 Apple Inc. 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 APPLE INC. ``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 APPLE INC. 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.
*/
#include "config.h"
#include "AirCCallingConvention.h"
#if ENABLE(B3_JIT)
#include "AirCCallSpecial.h"
#include "AirCode.h"
#include "B3CCallValue.h"
#include "B3Procedure.h"
namespace JSC { namespace B3 { namespace Air {
namespace {
template<typename BankInfo>
void marshallCCallArgumentImpl(Vector<Arg>& result, unsigned& argumentCount, unsigned& stackOffset, Value* child)
{
const auto registerCount = cCallArgumentRegisterCount(child);
if (is32Bit() && child->type() == Int64)
argumentCount = WTF::roundUpToMultipleOf<2>(argumentCount);
if (argumentCount < BankInfo::numberOfArgumentRegisters) {
for (unsigned i = 0; i < registerCount; i++)
result.append(Tmp(BankInfo::toArgumentRegister(argumentCount++)));
return;
}
unsigned slotSize, slotAlignment;
if ((isARM64() && isDarwin()) || isARM_THUMB2()) {
// Arguments are packed to their natural alignment.
//
// In the rare case when the Arg width does not match the argument width
// (32-bit arm passing a 64-bit argument), we respect the width needed
// for each stack access:
slotSize = bytesForWidth(cCallArgumentRegisterWidth(child->type()));
// but the logical stack slot uses the natural alignment of the argument
slotAlignment = sizeofType(child->type());
} else {
// On other platforms, arguments are always aligned to machine word
// boundaries.
slotSize = 8;
slotAlignment = slotSize;
}
stackOffset = WTF::roundUpToMultipleOf(slotAlignment, stackOffset);
for (unsigned i = 0; i < registerCount; i++) {
result.append(Arg::callArg(stackOffset));
stackOffset += slotSize;
}
}
void marshallCCallArgument(Vector<Arg> &result, unsigned& gpArgumentCount, unsigned& fpArgumentCount, unsigned& stackOffset, Value* child)
{
switch (bankForType(child->type())) {
case GP:
marshallCCallArgumentImpl<GPRInfo>(result, gpArgumentCount, stackOffset, child);
return;
case FP:
marshallCCallArgumentImpl<FPRInfo>(result, fpArgumentCount, stackOffset, child);
return;
}
RELEASE_ASSERT_NOT_REACHED();
}
} // anonymous namespace
Vector<Arg> computeCCallingConvention(Code& code, CCallValue* value)
{
Vector<Arg> result;
result.append(Tmp(CCallSpecial::scratchRegister)); // For callee
unsigned gpArgumentCount = 0;
unsigned fpArgumentCount = 0;
unsigned stackOffset = 0;
for (unsigned i = 1; i < value->numChildren(); ++i)
marshallCCallArgument(result, gpArgumentCount, fpArgumentCount, stackOffset, value->child(i));
code.requestCallArgAreaSizeInBytes(WTF::roundUpToMultipleOf(stackAlignmentBytes(), stackOffset));
return result;
}
size_t cCallResultCount(Code& code, CCallValue* value)
{
switch (value->type().kind()) {
case Void:
return 0;
case Int64:
if constexpr (is32Bit())
return 2;
return 1;
case Tuple:
// We only support tuples that return exactly two register sized ints.
UNUSED_PARAM(code);
ASSERT(code.proc().resultCount(value->type()) == 2);
ASSERT(code.proc().typeAtOffset(value->type(), 0) == pointerType());
ASSERT(code.proc().typeAtOffset(value->type(), 1) == pointerType());
return 2;
default:
return 1;
}
}
size_t cCallArgumentRegisterCount(const Value* value)
{
switch (value->type().kind()) {
case Void:
return 0;
case Int64:
if constexpr (is32Bit())
return 2;
return 1;
case Tuple:
RELEASE_ASSERT_NOT_REACHED();
default:
return 1;
}
}
Width cCallArgumentRegisterWidth(Type type)
{
if constexpr (is32Bit()) {
if (type == Int64)
return Width32;
}
return widthForType(type);
}
Tmp cCallResult(Code& code, CCallValue* value, unsigned index)
{
ASSERT(index < 2);
switch (value->type().kind()) {
case Void:
return Tmp();
case Int32:
return Tmp(GPRInfo::returnValueGPR);
case Int64:
if (is32Bit() && index == 1)
return Tmp(GPRInfo::returnValueGPR2);
return Tmp(GPRInfo::returnValueGPR);
case Float:
case Double:
ASSERT(!index);
return Tmp(FPRInfo::returnValueFPR);
case Tuple:
ASSERT_UNUSED(code, code.proc().resultCount(value->type()) == 2);
// We only support functions that return each parameter in its own register for now.
ASSERT(code.proc().typeAtOffset(value->type(), 0) == registerType());
ASSERT(code.proc().typeAtOffset(value->type(), 1) == registerType());
return index ? Tmp(GPRInfo::returnValueGPR2) : Tmp(GPRInfo::returnValueGPR);
case V128:
break;
}
RELEASE_ASSERT_NOT_REACHED();
return Tmp();
}
Inst buildCCall(Code& code, Value* origin, const Vector<Arg>& arguments)
{
Inst inst(Patch, origin, Arg::special(code.cCallSpecial()));
inst.args.append(arguments[0]);
inst.args.append(Tmp(GPRInfo::returnValueGPR));
inst.args.append(Tmp(GPRInfo::returnValueGPR2));
inst.args.append(Tmp(FPRInfo::returnValueFPR));
for (unsigned i = 1; i < arguments.size(); ++i) {
Arg arg = arguments[i];
if (arg.isTmp())
inst.args.append(arg);
}
return inst;
}
} } } // namespace JSC::B3::Air
#endif // ENABLE(B3_JIT)
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