| /* |
| * 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 "AirCCallSpecial.h" |
| |
| #if ENABLE(B3_JIT) |
| |
| namespace JSC { namespace B3 { namespace Air { |
| |
| CCallSpecial::CCallSpecial() |
| { |
| m_clobberedRegs = RegisterSet::allRegisters(); |
| m_clobberedRegs.exclude(RegisterSet::stackRegisters()); |
| m_clobberedRegs.exclude(RegisterSet::reservedHardwareRegisters()); |
| m_clobberedRegs.exclude(RegisterSet::calleeSaveRegisters()); |
| m_clobberedRegs.clear(GPRInfo::returnValueGPR); |
| m_clobberedRegs.clear(GPRInfo::returnValueGPR2); |
| m_clobberedRegs.clear(FPRInfo::returnValueFPR); |
| } |
| |
| CCallSpecial::~CCallSpecial() |
| { |
| } |
| |
| void CCallSpecial::forEachArg(Inst& inst, const ScopedLambda<Inst::EachArgCallback>& callback) |
| { |
| for (unsigned i = 0; i < numCalleeArgs; ++i) |
| callback(inst.args[calleeArgOffset + i], Arg::Use, GP, pointerWidth()); |
| for (unsigned i = 0; i < numReturnGPArgs; ++i) |
| callback(inst.args[returnGPArgOffset + i], Arg::Def, GP, pointerWidth()); |
| for (unsigned i = 0; i < numReturnFPArgs; ++i) |
| callback(inst.args[returnFPArgOffset + i], Arg::Def, FP, Width64); |
| |
| for (unsigned i = argArgOffset; i < inst.args.size(); ++i) { |
| // For the type, we can just query the arg's bank. The arg will have a bank, because we |
| // require these args to be argument registers. |
| Bank bank = inst.args[i].bank(); |
| callback(inst.args[i], Arg::Use, bank, conservativeWidth(bank)); |
| } |
| } |
| |
| bool CCallSpecial::isValid(Inst& inst) |
| { |
| if (inst.args.size() < argArgOffset) |
| return false; |
| |
| for (unsigned i = 0; i < numCalleeArgs; ++i) { |
| Arg& arg = inst.args[i + calleeArgOffset]; |
| if (!arg.isGP()) |
| return false; |
| switch (arg.kind()) { |
| case Arg::Imm: |
| if (is32Bit()) |
| break; |
| return false; |
| case Arg::BigImm: |
| if (is64Bit()) |
| break; |
| return false; |
| case Arg::Tmp: |
| case Arg::Addr: |
| case Arg::ExtendedOffsetAddr: |
| case Arg::Stack: |
| case Arg::CallArg: |
| break; |
| default: |
| return false; |
| } |
| } |
| |
| // Return args need to be exact. |
| if (inst.args[returnGPArgOffset + 0] != Tmp(GPRInfo::returnValueGPR)) |
| return false; |
| if (inst.args[returnGPArgOffset + 1] != Tmp(GPRInfo::returnValueGPR2)) |
| return false; |
| if (inst.args[returnFPArgOffset + 0] != Tmp(FPRInfo::returnValueFPR)) |
| return false; |
| |
| for (unsigned i = argArgOffset; i < inst.args.size(); ++i) { |
| if (!inst.args[i].isReg()) |
| return false; |
| |
| if (inst.args[i] == Tmp(scratchRegister)) |
| return false; |
| } |
| return true; |
| } |
| |
| bool CCallSpecial::admitsStack(Inst&, unsigned argIndex) |
| { |
| // The callee can be on the stack unless targeting ARM64, where we can't later properly |
| // handle an Addr callee argument in generate() due to disallowed scratch register usage. |
| if (argIndex == calleeArgOffset) |
| return !isARM64(); |
| |
| return false; |
| } |
| |
| bool CCallSpecial::admitsExtendedOffsetAddr(Inst& inst, unsigned argIndex) |
| { |
| return admitsStack(inst, argIndex); |
| } |
| |
| void CCallSpecial::reportUsedRegisters(Inst&, const RegisterSet&) |
| { |
| } |
| |
| CCallHelpers::Jump CCallSpecial::generate(Inst& inst, CCallHelpers& jit, GenerationContext&) |
| { |
| switch (inst.args[calleeArgOffset].kind()) { |
| case Arg::Imm: |
| case Arg::BigImm: |
| jit.move(inst.args[calleeArgOffset].asTrustedImmPtr(), scratchRegister); |
| jit.call(scratchRegister, NoPtrTag); |
| break; |
| case Arg::Tmp: |
| jit.call(inst.args[calleeArgOffset].gpr(), NoPtrTag); |
| break; |
| case Arg::Addr: |
| case Arg::ExtendedOffsetAddr: |
| jit.call(inst.args[calleeArgOffset].asAddress(), NoPtrTag); |
| break; |
| default: |
| RELEASE_ASSERT_NOT_REACHED(); |
| break; |
| } |
| return CCallHelpers::Jump(); |
| } |
| |
| RegisterSet CCallSpecial::extraEarlyClobberedRegs(Inst&) |
| { |
| return m_emptyRegs; |
| } |
| |
| RegisterSet CCallSpecial::extraClobberedRegs(Inst&) |
| { |
| return m_clobberedRegs; |
| } |
| |
| void CCallSpecial::dumpImpl(PrintStream& out) const |
| { |
| out.print("CCall"); |
| } |
| |
| void CCallSpecial::deepDumpImpl(PrintStream& out) const |
| { |
| out.print("function call that uses the C calling convention."); |
| } |
| |
| } } } // namespace JSC::B3::Air |
| |
| #endif // ENABLE(B3_JIT) |