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/*
* Copyright (C) 2015-2018 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 "AirCode.h"
#if ENABLE(B3_JIT)
#include "AirAllocateRegistersAndStackAndGenerateCode.h"
#include "AirCCallSpecial.h"
#include "AirCFG.h"
#include "AllowMacroScratchRegisterUsageIf.h"
#include "B3BasicBlockUtils.h"
#include "B3Procedure.h"
#include "B3StackSlot.h"
#include <wtf/ListDump.h>
#include <wtf/MathExtras.h>
namespace JSC { namespace B3 { namespace Air {
static void defaultPrologueGenerator(CCallHelpers& jit, Code& code)
{
jit.emitFunctionPrologue();
if (code.frameSize()) {
AllowMacroScratchRegisterUsageIf allowScratch(jit, isARM64());
jit.addPtr(MacroAssembler::TrustedImm32(-code.frameSize()), MacroAssembler::framePointerRegister, MacroAssembler::stackPointerRegister);
if (Options::zeroStackFrame())
jit.clearStackFrame(MacroAssembler::framePointerRegister, MacroAssembler::stackPointerRegister, GPRInfo::nonArgGPR0, code.frameSize());
}
jit.emitSave(code.calleeSaveRegisterAtOffsetList());
}
Code::Code(Procedure& proc)
: m_proc(proc)
, m_cfg(new CFG(*this))
, m_lastPhaseName("initial")
, m_defaultPrologueGenerator(createSharedTask<PrologueGeneratorFunction>(&defaultPrologueGenerator))
{
// Come up with initial orderings of registers. The user may replace this with something else.
forEachBank(
[&] (Bank bank) {
Vector<Reg> volatileRegs;
Vector<Reg> calleeSaveRegs;
RegisterSet all = bank == GP ? RegisterSet::allGPRs() : RegisterSet::allFPRs();
all.exclude(RegisterSet::stackRegisters());
all.exclude(RegisterSet::reservedHardwareRegisters());
RegisterSet calleeSave = RegisterSet::calleeSaveRegisters();
all.forEach(
[&] (Reg reg) {
if (!calleeSave.get(reg))
volatileRegs.append(reg);
});
all.forEach(
[&] (Reg reg) {
if (calleeSave.get(reg))
calleeSaveRegs.append(reg);
});
if (Options::airRandomizeRegs()) {
WeakRandom random(Options::airRandomizeRegsSeed() ? Options::airRandomizeRegsSeed() : m_weakRandom.getUint32());
shuffleVector(volatileRegs, [&] (unsigned limit) { return random.getUint32(limit); });
shuffleVector(calleeSaveRegs, [&] (unsigned limit) { return random.getUint32(limit); });
}
Vector<Reg> result;
result.appendVector(volatileRegs);
result.appendVector(calleeSaveRegs);
setRegsInPriorityOrder(bank, result);
});
if (auto reg = pinnedExtendedOffsetAddrRegister())
pinRegister(*reg);
m_pinnedRegs.set(MacroAssembler::framePointerRegister);
}
Code::~Code()
{
}
void Code::emitDefaultPrologue(CCallHelpers& jit)
{
defaultPrologueGenerator(jit, *this);
}
void Code::setRegsInPriorityOrder(Bank bank, const Vector<Reg>& regs)
{
regsInPriorityOrderImpl(bank) = regs;
m_mutableRegs = { };
forEachBank(
[&] (Bank bank) {
for (Reg reg : regsInPriorityOrder(bank))
m_mutableRegs.set(reg);
});
}
void Code::pinRegister(Reg reg)
{
Vector<Reg>& regs = regsInPriorityOrderImpl(Arg(Tmp(reg)).bank());
ASSERT(regs.contains(reg));
regs.removeFirst(reg);
m_mutableRegs.clear(reg);
ASSERT(!regs.contains(reg));
m_pinnedRegs.set(reg);
}
RegisterSet Code::mutableGPRs()
{
RegisterSet result = m_mutableRegs;
result.filter(RegisterSet::allGPRs());
return result;
}
RegisterSet Code::mutableFPRs()
{
RegisterSet result = m_mutableRegs;
result.filter(RegisterSet::allFPRs());
return result;
}
bool Code::needsUsedRegisters() const
{
return m_proc.needsUsedRegisters();
}
BasicBlock* Code::addBlock(double frequency)
{
std::unique_ptr<BasicBlock> block(new BasicBlock(m_blocks.size(), frequency));
BasicBlock* result = block.get();
m_blocks.append(WTFMove(block));
return result;
}
StackSlot* Code::addStackSlot(unsigned byteSize, StackSlotKind kind, B3::StackSlot* b3Slot)
{
StackSlot* result = m_stackSlots.addNew(byteSize, kind, b3Slot);
if (m_stackIsAllocated) {
// FIXME: This is unnecessarily awful. Fortunately, it doesn't run often.
unsigned extent = WTF::roundUpToMultipleOf(result->alignment(), frameSize() + byteSize);
result->setOffsetFromFP(-static_cast<ptrdiff_t>(extent));
setFrameSize(WTF::roundUpToMultipleOf(stackAlignmentBytes(), extent));
}
return result;
}
StackSlot* Code::addStackSlot(B3::StackSlot* b3Slot)
{
return addStackSlot(b3Slot->byteSize(), StackSlotKind::Locked, b3Slot);
}
Special* Code::addSpecial(std::unique_ptr<Special> special)
{
special->m_code = this;
return m_specials.add(WTFMove(special));
}
CCallSpecial* Code::cCallSpecial()
{
if (!m_cCallSpecial) {
m_cCallSpecial = static_cast<CCallSpecial*>(
addSpecial(std::make_unique<CCallSpecial>()));
}
return m_cCallSpecial;
}
bool Code::isEntrypoint(BasicBlock* block) const
{
// Note: This function must work both before and after LowerEntrySwitch.
if (m_entrypoints.isEmpty())
return !block->index();
for (const FrequentedBlock& entrypoint : m_entrypoints) {
if (entrypoint.block() == block)
return true;
}
return false;
}
Optional<unsigned> Code::entrypointIndex(BasicBlock* block) const
{
RELEASE_ASSERT(m_entrypoints.size());
for (unsigned i = 0; i < m_entrypoints.size(); ++i) {
if (m_entrypoints[i].block() == block)
return i;
}
return WTF::nullopt;
}
void Code::setCalleeSaveRegisterAtOffsetList(RegisterAtOffsetList&& registerAtOffsetList, StackSlot* slot)
{
m_uncorrectedCalleeSaveRegisterAtOffsetList = WTFMove(registerAtOffsetList);
for (const RegisterAtOffset& registerAtOffset : m_uncorrectedCalleeSaveRegisterAtOffsetList)
m_calleeSaveRegisters.set(registerAtOffset.reg());
m_calleeSaveStackSlot = slot;
}
RegisterAtOffsetList Code::calleeSaveRegisterAtOffsetList() const
{
RegisterAtOffsetList result = m_uncorrectedCalleeSaveRegisterAtOffsetList;
if (StackSlot* slot = m_calleeSaveStackSlot) {
ptrdiff_t offset = slot->byteSize() + slot->offsetFromFP();
for (size_t i = result.size(); i--;) {
result.at(i) = RegisterAtOffset(
result.at(i).reg(),
result.at(i).offset() + offset);
}
}
return result;
}
void Code::resetReachability()
{
clearPredecessors(m_blocks);
if (m_entrypoints.isEmpty())
updatePredecessorsAfter(m_blocks[0].get());
else {
for (const FrequentedBlock& entrypoint : m_entrypoints)
updatePredecessorsAfter(entrypoint.block());
}
for (auto& block : m_blocks) {
if (isBlockDead(block.get()) && !isEntrypoint(block.get()))
block = nullptr;
}
}
void Code::dump(PrintStream& out) const
{
if (!m_entrypoints.isEmpty())
out.print("Entrypoints: ", listDump(m_entrypoints), "\n");
for (BasicBlock* block : *this)
out.print(deepDump(block));
if (stackSlots().size()) {
out.print("Stack slots:\n");
for (StackSlot* slot : stackSlots())
out.print(" ", pointerDump(slot), ": ", deepDump(slot), "\n");
}
if (specials().size()) {
out.print("Specials:\n");
for (Special* special : specials())
out.print(" ", deepDump(special), "\n");
}
if (m_frameSize || m_stackIsAllocated)
out.print("Frame size: ", m_frameSize, m_stackIsAllocated ? " (Allocated)" : "", "\n");
if (m_callArgAreaSize)
out.print("Call arg area size: ", m_callArgAreaSize, "\n");
RegisterAtOffsetList calleeSaveRegisters = this->calleeSaveRegisterAtOffsetList();
if (calleeSaveRegisters.size())
out.print("Callee saves: ", calleeSaveRegisters, "\n");
}
unsigned Code::findFirstBlockIndex(unsigned index) const
{
while (index < size() && !at(index))
index++;
return index;
}
unsigned Code::findNextBlockIndex(unsigned index) const
{
return findFirstBlockIndex(index + 1);
}
BasicBlock* Code::findNextBlock(BasicBlock* block) const
{
unsigned index = findNextBlockIndex(block->index());
if (index < size())
return at(index);
return nullptr;
}
void Code::addFastTmp(Tmp tmp)
{
m_fastTmps.add(tmp);
}
void* Code::addDataSection(size_t size)
{
return m_proc.addDataSection(size);
}
unsigned Code::jsHash() const
{
unsigned result = 0;
for (BasicBlock* block : *this) {
result *= 1000001;
for (Inst& inst : *block) {
result *= 97;
result += inst.jsHash();
}
for (BasicBlock* successor : block->successorBlocks()) {
result *= 7;
result += successor->index();
}
}
for (StackSlot* slot : stackSlots()) {
result *= 101;
result += slot->jsHash();
}
return result;
}
void Code::setNumEntrypoints(unsigned numEntrypoints)
{
m_prologueGenerators.clear();
m_prologueGenerators.reserveCapacity(numEntrypoints);
for (unsigned i = 0; i < numEntrypoints; ++i)
m_prologueGenerators.uncheckedAppend(m_defaultPrologueGenerator.copyRef());
}
} } } // namespace JSC::B3::Air
#endif // ENABLE(B3_JIT)