450 lines
15 KiB
C++
450 lines
15 KiB
C++
//===--- AArch64.cpp - AArch64 (not ARM) Helpers for Tools ------*- 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 "AArch64.h"
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#include "../CommonArgs.h"
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#include "clang/Driver/Driver.h"
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#include "clang/Driver/DriverDiagnostic.h"
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#include "clang/Driver/Options.h"
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#include "llvm/Option/ArgList.h"
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#include "llvm/TargetParser/AArch64TargetParser.h"
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#include "llvm/TargetParser/Host.h"
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using namespace clang::driver;
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using namespace clang::driver::tools;
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using namespace clang;
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using namespace llvm::opt;
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/// \returns true if the given triple can determine the default CPU type even
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/// if -arch is not specified.
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static bool isCPUDeterminedByTriple(const llvm::Triple &Triple) {
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return Triple.isOSDarwin();
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}
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/// getAArch64TargetCPU - Get the (LLVM) name of the AArch64 cpu we are
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/// targeting. Set \p A to the Arg corresponding to the -mcpu argument if it is
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/// provided, or to nullptr otherwise.
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std::string aarch64::getAArch64TargetCPU(const ArgList &Args,
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const llvm::Triple &Triple, Arg *&A) {
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std::string CPU;
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// If we have -mcpu, use that.
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if ((A = Args.getLastArg(options::OPT_mcpu_EQ))) {
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StringRef Mcpu = A->getValue();
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CPU = Mcpu.split("+").first.lower();
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}
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CPU = llvm::AArch64::resolveCPUAlias(CPU);
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// Handle CPU name is 'native'.
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if (CPU == "native")
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return std::string(llvm::sys::getHostCPUName());
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if (CPU.size())
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return CPU;
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if (Triple.isTargetMachineMac() &&
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Triple.getArch() == llvm::Triple::aarch64) {
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// Apple Silicon macs default to M1 CPUs.
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return "apple-m1";
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}
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if (Triple.isXROS()) {
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// The xrOS simulator runs on M1 as well, it should have been covered above.
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assert(!Triple.isSimulatorEnvironment() && "xrossim should be mac-like");
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return "apple-a12";
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}
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// arm64e requires v8.3a and only runs on apple-a12 and later CPUs.
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if (Triple.isArm64e())
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return "apple-a12";
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// Make sure we pick the appropriate Apple CPU when targetting a Darwin OS.
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if (Triple.isOSDarwin())
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return Triple.getArch() == llvm::Triple::aarch64_32 ? "apple-s4"
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: "apple-a7";
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return "generic";
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}
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// Decode AArch64 features from string like +[no]featureA+[no]featureB+...
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static bool DecodeAArch64Features(const Driver &D, StringRef text,
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llvm::AArch64::ExtensionSet &Extensions) {
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SmallVector<StringRef, 8> Split;
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text.split(Split, StringRef("+"), -1, false);
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for (StringRef Feature : Split) {
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if (Feature == "neon" || Feature == "noneon") {
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D.Diag(clang::diag::err_drv_no_neon_modifier);
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continue;
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}
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if (!Extensions.parseModifier(Feature))
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return false;
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}
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return true;
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}
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// Check if the CPU name and feature modifiers in -mcpu are legal. If yes,
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// decode CPU and feature.
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static bool DecodeAArch64Mcpu(const Driver &D, StringRef Mcpu, StringRef &CPU,
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llvm::AArch64::ExtensionSet &Extensions) {
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std::pair<StringRef, StringRef> Split = Mcpu.split("+");
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CPU = Split.first;
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if (CPU == "native")
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CPU = llvm::sys::getHostCPUName();
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if (CPU == "generic") {
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Extensions.enable(llvm::AArch64::AEK_SIMD);
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} else {
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const std::optional<llvm::AArch64::CpuInfo> CpuInfo =
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llvm::AArch64::parseCpu(CPU);
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if (!CpuInfo)
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return false;
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Extensions.addCPUDefaults(*CpuInfo);
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}
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if (Split.second.size() &&
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!DecodeAArch64Features(D, Split.second, Extensions))
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return false;
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return true;
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}
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static bool
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getAArch64ArchFeaturesFromMarch(const Driver &D, StringRef March,
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const ArgList &Args,
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llvm::AArch64::ExtensionSet &Extensions) {
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std::string MarchLowerCase = March.lower();
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std::pair<StringRef, StringRef> Split = StringRef(MarchLowerCase).split("+");
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const llvm::AArch64::ArchInfo *ArchInfo =
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llvm::AArch64::parseArch(Split.first);
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if (Split.first == "native")
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ArchInfo = llvm::AArch64::getArchForCpu(llvm::sys::getHostCPUName().str());
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if (!ArchInfo)
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return false;
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Extensions.addArchDefaults(*ArchInfo);
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if ((Split.second.size() &&
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!DecodeAArch64Features(D, Split.second, Extensions)))
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return false;
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return true;
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}
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static bool
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getAArch64ArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu,
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const ArgList &Args,
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llvm::AArch64::ExtensionSet &Extensions) {
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StringRef CPU;
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std::string McpuLowerCase = Mcpu.lower();
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if (!DecodeAArch64Mcpu(D, McpuLowerCase, CPU, Extensions))
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return false;
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return true;
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}
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static bool
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getAArch64MicroArchFeaturesFromMtune(const Driver &D, StringRef Mtune,
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const ArgList &Args,
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std::vector<StringRef> &Features) {
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std::string MtuneLowerCase = Mtune.lower();
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// Check CPU name is valid, but ignore any extensions on it.
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llvm::AArch64::ExtensionSet Extensions;
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StringRef Tune;
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if (!DecodeAArch64Mcpu(D, MtuneLowerCase, Tune, Extensions))
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return false;
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// Handle CPU name is 'native'.
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if (MtuneLowerCase == "native")
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MtuneLowerCase = std::string(llvm::sys::getHostCPUName());
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if (MtuneLowerCase == "cyclone" ||
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StringRef(MtuneLowerCase).starts_with("apple")) {
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Features.push_back("+zcm");
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Features.push_back("+zcz");
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}
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return true;
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}
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static bool
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getAArch64MicroArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu,
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const ArgList &Args,
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std::vector<StringRef> &Features) {
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StringRef CPU;
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// Check CPU name is valid, but ignore any extensions on it.
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llvm::AArch64::ExtensionSet DecodedFeature;
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std::string McpuLowerCase = Mcpu.lower();
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if (!DecodeAArch64Mcpu(D, McpuLowerCase, CPU, DecodedFeature))
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return false;
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return getAArch64MicroArchFeaturesFromMtune(D, CPU, Args, Features);
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}
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void aarch64::getAArch64TargetFeatures(const Driver &D,
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const llvm::Triple &Triple,
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const ArgList &Args,
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std::vector<StringRef> &Features,
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bool ForAS) {
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Arg *A;
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bool success = true;
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llvm::StringRef WaMArch;
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llvm::AArch64::ExtensionSet Extensions;
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if (ForAS)
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for (const auto *A :
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Args.filtered(options::OPT_Wa_COMMA, options::OPT_Xassembler))
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for (StringRef Value : A->getValues())
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if (Value.starts_with("-march="))
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WaMArch = Value.substr(7);
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// Call getAArch64ArchFeaturesFromMarch only if "-Wa,-march=" or
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// "-Xassembler -march" is detected. Otherwise it may return false
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// and causes Clang to error out.
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if (!WaMArch.empty())
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success = getAArch64ArchFeaturesFromMarch(D, WaMArch, Args, Extensions);
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else if ((A = Args.getLastArg(options::OPT_march_EQ)))
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success =
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getAArch64ArchFeaturesFromMarch(D, A->getValue(), Args, Extensions);
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else if ((A = Args.getLastArg(options::OPT_mcpu_EQ)))
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success =
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getAArch64ArchFeaturesFromMcpu(D, A->getValue(), Args, Extensions);
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else if (isCPUDeterminedByTriple(Triple))
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success = getAArch64ArchFeaturesFromMcpu(
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D, getAArch64TargetCPU(Args, Triple, A), Args, Extensions);
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else
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// Default to 'A' profile if the architecture is not specified.
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success = getAArch64ArchFeaturesFromMarch(D, "armv8-a", Args, Extensions);
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if (success && (A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ)))
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success =
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getAArch64MicroArchFeaturesFromMtune(D, A->getValue(), Args, Features);
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else if (success && (A = Args.getLastArg(options::OPT_mcpu_EQ)))
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success =
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getAArch64MicroArchFeaturesFromMcpu(D, A->getValue(), Args, Features);
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else if (success && isCPUDeterminedByTriple(Triple))
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success = getAArch64MicroArchFeaturesFromMcpu(
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D, getAArch64TargetCPU(Args, Triple, A), Args, Features);
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if (!success) {
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auto Diag = D.Diag(diag::err_drv_unsupported_option_argument);
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// If "-Wa,-march=" is used, 'WaMArch' will contain the argument's value,
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// while 'A' is uninitialized. Only dereference 'A' in the other case.
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if (!WaMArch.empty())
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Diag << "-march=" << WaMArch;
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else
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Diag << A->getSpelling() << A->getValue();
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}
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// -mgeneral-regs-only disables all floating-point features.
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if (Args.getLastArg(options::OPT_mgeneral_regs_only)) {
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Extensions.disable(llvm::AArch64::AEK_FP);
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}
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// En/disable crc
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if (Arg *A = Args.getLastArg(options::OPT_mcrc, options::OPT_mnocrc)) {
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if (A->getOption().matches(options::OPT_mcrc))
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Extensions.enable(llvm::AArch64::AEK_CRC);
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else
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Extensions.disable(llvm::AArch64::AEK_CRC);
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}
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// At this point all hardware features are decided, so convert the extensions
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// set to a feature list.
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Extensions.toLLVMFeatureList(Features);
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if (Arg *A = Args.getLastArg(options::OPT_mtp_mode_EQ)) {
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StringRef Mtp = A->getValue();
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if (Mtp == "el3" || Mtp == "tpidr_el3")
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Features.push_back("+tpidr-el3");
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else if (Mtp == "el2" || Mtp == "tpidr_el2")
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Features.push_back("+tpidr-el2");
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else if (Mtp == "el1" || Mtp == "tpidr_el1")
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Features.push_back("+tpidr-el1");
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else if (Mtp == "tpidrro_el0")
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Features.push_back("+tpidrro-el0");
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else if (Mtp != "el0" && Mtp != "tpidr_el0")
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D.Diag(diag::err_drv_invalid_mtp) << A->getAsString(Args);
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}
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// Enable/disable straight line speculation hardening.
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if (Arg *A = Args.getLastArg(options::OPT_mharden_sls_EQ)) {
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StringRef Scope = A->getValue();
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bool EnableRetBr = false;
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bool EnableBlr = false;
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bool DisableComdat = false;
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if (Scope != "none") {
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SmallVector<StringRef, 4> Opts;
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Scope.split(Opts, ",");
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for (auto Opt : Opts) {
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Opt = Opt.trim();
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if (Opt == "all") {
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EnableBlr = true;
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EnableRetBr = true;
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continue;
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}
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if (Opt == "retbr") {
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EnableRetBr = true;
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continue;
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}
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if (Opt == "blr") {
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EnableBlr = true;
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continue;
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}
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if (Opt == "comdat") {
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DisableComdat = false;
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continue;
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}
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if (Opt == "nocomdat") {
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DisableComdat = true;
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continue;
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}
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D.Diag(diag::err_drv_unsupported_option_argument)
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<< A->getSpelling() << Scope;
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break;
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}
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}
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if (EnableRetBr)
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Features.push_back("+harden-sls-retbr");
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if (EnableBlr)
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Features.push_back("+harden-sls-blr");
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if (DisableComdat) {
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Features.push_back("+harden-sls-nocomdat");
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}
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}
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if (Arg *A = Args.getLastArg(options::OPT_mno_unaligned_access,
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options::OPT_munaligned_access)) {
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if (A->getOption().matches(options::OPT_mno_unaligned_access))
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Features.push_back("+strict-align");
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} else if (Triple.isOSOpenBSD())
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Features.push_back("+strict-align");
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if (Args.hasArg(options::OPT_ffixed_x1))
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Features.push_back("+reserve-x1");
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if (Args.hasArg(options::OPT_ffixed_x2))
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Features.push_back("+reserve-x2");
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if (Args.hasArg(options::OPT_ffixed_x3))
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Features.push_back("+reserve-x3");
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if (Args.hasArg(options::OPT_ffixed_x4))
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Features.push_back("+reserve-x4");
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if (Args.hasArg(options::OPT_ffixed_x5))
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Features.push_back("+reserve-x5");
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if (Args.hasArg(options::OPT_ffixed_x6))
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Features.push_back("+reserve-x6");
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if (Args.hasArg(options::OPT_ffixed_x7))
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Features.push_back("+reserve-x7");
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if (Args.hasArg(options::OPT_ffixed_x9))
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Features.push_back("+reserve-x9");
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if (Args.hasArg(options::OPT_ffixed_x10))
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Features.push_back("+reserve-x10");
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if (Args.hasArg(options::OPT_ffixed_x11))
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Features.push_back("+reserve-x11");
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if (Args.hasArg(options::OPT_ffixed_x12))
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Features.push_back("+reserve-x12");
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if (Args.hasArg(options::OPT_ffixed_x13))
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Features.push_back("+reserve-x13");
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if (Args.hasArg(options::OPT_ffixed_x14))
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Features.push_back("+reserve-x14");
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if (Args.hasArg(options::OPT_ffixed_x15))
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Features.push_back("+reserve-x15");
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if (Args.hasArg(options::OPT_ffixed_x18))
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Features.push_back("+reserve-x18");
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if (Args.hasArg(options::OPT_ffixed_x20))
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Features.push_back("+reserve-x20");
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if (Args.hasArg(options::OPT_ffixed_x21))
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Features.push_back("+reserve-x21");
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if (Args.hasArg(options::OPT_ffixed_x22))
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Features.push_back("+reserve-x22");
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if (Args.hasArg(options::OPT_ffixed_x23))
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Features.push_back("+reserve-x23");
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if (Args.hasArg(options::OPT_ffixed_x24))
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Features.push_back("+reserve-x24");
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if (Args.hasArg(options::OPT_ffixed_x25))
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Features.push_back("+reserve-x25");
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if (Args.hasArg(options::OPT_ffixed_x26))
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Features.push_back("+reserve-x26");
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if (Args.hasArg(options::OPT_ffixed_x27))
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Features.push_back("+reserve-x27");
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if (Args.hasArg(options::OPT_ffixed_x28))
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Features.push_back("+reserve-x28");
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if (Args.hasArg(options::OPT_ffixed_x30))
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Features.push_back("+reserve-x30");
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if (Args.hasArg(options::OPT_fcall_saved_x8))
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Features.push_back("+call-saved-x8");
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if (Args.hasArg(options::OPT_fcall_saved_x9))
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Features.push_back("+call-saved-x9");
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if (Args.hasArg(options::OPT_fcall_saved_x10))
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Features.push_back("+call-saved-x10");
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if (Args.hasArg(options::OPT_fcall_saved_x11))
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Features.push_back("+call-saved-x11");
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if (Args.hasArg(options::OPT_fcall_saved_x12))
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Features.push_back("+call-saved-x12");
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if (Args.hasArg(options::OPT_fcall_saved_x13))
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Features.push_back("+call-saved-x13");
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if (Args.hasArg(options::OPT_fcall_saved_x14))
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Features.push_back("+call-saved-x14");
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if (Args.hasArg(options::OPT_fcall_saved_x15))
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Features.push_back("+call-saved-x15");
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if (Args.hasArg(options::OPT_fcall_saved_x18))
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Features.push_back("+call-saved-x18");
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if (Args.hasArg(options::OPT_mno_neg_immediates))
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Features.push_back("+no-neg-immediates");
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if (Arg *A = Args.getLastArg(options::OPT_mfix_cortex_a53_835769,
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options::OPT_mno_fix_cortex_a53_835769)) {
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if (A->getOption().matches(options::OPT_mfix_cortex_a53_835769))
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Features.push_back("+fix-cortex-a53-835769");
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else
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Features.push_back("-fix-cortex-a53-835769");
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} else if (Triple.isAndroid() || Triple.isOHOSFamily()) {
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// Enabled A53 errata (835769) workaround by default on android
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Features.push_back("+fix-cortex-a53-835769");
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} else if (Triple.isOSFuchsia()) {
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std::string CPU = getCPUName(D, Args, Triple);
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if (CPU.empty() || CPU == "generic" || CPU == "cortex-a53")
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Features.push_back("+fix-cortex-a53-835769");
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}
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if (Args.getLastArg(options::OPT_mno_bti_at_return_twice))
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Features.push_back("+no-bti-at-return-twice");
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}
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