133 lines
4.9 KiB
C++
133 lines
4.9 KiB
C++
//===- RuntimeLibcalls.cpp - Interface for runtime libcalls -----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/RuntimeLibcalls.h"
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#include "llvm/ADT/StringTable.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/TargetParser/ARMTargetParser.h"
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#define DEBUG_TYPE "runtime-libcalls-info"
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using namespace llvm;
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using namespace RTLIB;
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#define GET_INIT_RUNTIME_LIBCALL_NAMES
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#define GET_SET_TARGET_RUNTIME_LIBCALL_SETS
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#include "llvm/IR/RuntimeLibcalls.inc"
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#undef GET_INIT_RUNTIME_LIBCALL_NAMES
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#undef GET_SET_TARGET_RUNTIME_LIBCALL_SETS
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/// Set default libcall names. If a target wants to opt-out of a libcall it
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/// should be placed here.
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void RuntimeLibcallsInfo::initLibcalls(const Triple &TT,
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ExceptionHandling ExceptionModel,
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FloatABI::ABIType FloatABI,
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EABI EABIVersion, StringRef ABIName) {
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setTargetRuntimeLibcallSets(TT, FloatABI, EABIVersion, ABIName);
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if (ExceptionModel == ExceptionHandling::SjLj)
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setLibcallImpl(RTLIB::UNWIND_RESUME, RTLIB::_Unwind_SjLj_Resume);
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if (TT.isARM() || TT.isThumb()) {
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// The half <-> float conversion functions are always soft-float on
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// non-watchos platforms, but are needed for some targets which use a
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// hard-float calling convention by default.
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if (!TT.isWatchABI()) {
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if (isAAPCS_ABI(TT, ABIName)) {
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setLibcallImplCallingConv(RTLIB::__truncsfhf2, CallingConv::ARM_AAPCS);
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setLibcallImplCallingConv(RTLIB::__truncdfhf2, CallingConv::ARM_AAPCS);
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setLibcallImplCallingConv(RTLIB::__extendhfsf2, CallingConv::ARM_AAPCS);
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setLibcallImplCallingConv(RTLIB::__gnu_h2f_ieee,
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CallingConv::ARM_AAPCS);
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setLibcallImplCallingConv(RTLIB::__gnu_f2h_ieee,
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CallingConv::ARM_AAPCS);
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} else {
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setLibcallImplCallingConv(RTLIB::__truncsfhf2, CallingConv::ARM_APCS);
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setLibcallImplCallingConv(RTLIB::__truncdfhf2, CallingConv::ARM_APCS);
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setLibcallImplCallingConv(RTLIB::__extendhfsf2, CallingConv::ARM_APCS);
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setLibcallImplCallingConv(RTLIB::__gnu_h2f_ieee, CallingConv::ARM_APCS);
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setLibcallImplCallingConv(RTLIB::__gnu_f2h_ieee, CallingConv::ARM_APCS);
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}
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}
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return;
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}
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if (TT.getArch() == Triple::ArchType::msp430) {
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setLibcallImplCallingConv(RTLIB::__mspabi_mpyll,
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CallingConv::MSP430_BUILTIN);
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}
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}
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RTLIB::LibcallImpl
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RuntimeLibcallsInfo::getSupportedLibcallImpl(StringRef FuncName) const {
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const ArrayRef<uint16_t> RuntimeLibcallNameOffsets(
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RuntimeLibcallNameOffsetTable);
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iterator_range<ArrayRef<uint16_t>::const_iterator> Range =
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getRecognizedLibcallImpls(FuncName);
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for (auto I = Range.begin(); I != Range.end(); ++I) {
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RTLIB::LibcallImpl Impl =
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static_cast<RTLIB::LibcallImpl>(I - RuntimeLibcallNameOffsets.begin());
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// FIXME: This should not depend on looking up ImplToLibcall, only the list
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// of libcalls for the module.
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RTLIB::LibcallImpl Recognized = LibcallImpls[ImplToLibcall[Impl]];
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if (Recognized != RTLIB::Unsupported)
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return Recognized;
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}
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return RTLIB::Unsupported;
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}
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iterator_range<ArrayRef<uint16_t>::const_iterator>
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RuntimeLibcallsInfo::getRecognizedLibcallImpls(StringRef FuncName) {
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StringTable::Iterator It = lower_bound(RuntimeLibcallImplNameTable, FuncName);
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if (It == RuntimeLibcallImplNameTable.end() || *It != FuncName)
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return iterator_range(ArrayRef<uint16_t>());
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uint16_t IndexVal = It.offset().value();
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const ArrayRef<uint16_t> TableRef(RuntimeLibcallNameOffsetTable);
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ArrayRef<uint16_t>::const_iterator E = TableRef.end();
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ArrayRef<uint16_t>::const_iterator EntriesBegin =
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std::lower_bound(TableRef.begin(), E, IndexVal);
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ArrayRef<uint16_t>::const_iterator EntriesEnd = EntriesBegin;
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while (EntriesEnd != E && *EntriesEnd == IndexVal)
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++EntriesEnd;
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assert(EntriesBegin != E &&
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"libcall found in name table but not offset table");
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return make_range(EntriesBegin, EntriesEnd);
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}
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bool RuntimeLibcallsInfo::isAAPCS_ABI(const Triple &TT, StringRef ABIName) {
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const ARM::ARMABI TargetABI = ARM::computeTargetABI(TT, ABIName);
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return TargetABI == ARM::ARM_ABI_AAPCS || TargetABI == ARM::ARM_ABI_AAPCS16;
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}
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bool RuntimeLibcallsInfo::darwinHasExp10(const Triple &TT) {
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switch (TT.getOS()) {
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case Triple::MacOSX:
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return !TT.isMacOSXVersionLT(10, 9);
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case Triple::IOS:
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return !TT.isOSVersionLT(7, 0);
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case Triple::DriverKit:
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case Triple::TvOS:
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case Triple::WatchOS:
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case Triple::XROS:
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case Triple::BridgeOS:
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return true;
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default:
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return false;
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}
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}
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