[clang] [clang] Add managarm support (PR #139271)
Fangrui Song via cfe-commits
cfe-commits at lists.llvm.org
Sat Jun 14 17:48:22 PDT 2025
================
@@ -0,0 +1,221 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Managarm.h"
+#include "Arch/ARM.h"
+#include "Arch/RISCV.h"
+#include "clang/Config/config.h"
+#include "clang/Driver/CommonArgs.h"
+#include "clang/Driver/Driver.h"
+#include "clang/Driver/Options.h"
+#include "clang/Driver/SanitizerArgs.h"
+#include "llvm/Option/ArgList.h"
+#include "llvm/Support/Path.h"
+
+using namespace clang::driver;
+using namespace clang::driver::toolchains;
+using namespace clang;
+using namespace llvm::opt;
+
+using tools::addPathIfExists;
+
+std::string Managarm::getMultiarchTriple(const Driver &D,
+ const llvm::Triple &TargetTriple,
+ StringRef SysRoot) const {
+ switch (TargetTriple.getArch()) {
+ default:
+ return TargetTriple.str();
+ case llvm::Triple::x86_64:
+ return "x86_64-managarm-" + TargetTriple.getEnvironmentName().str();
+ case llvm::Triple::aarch64:
+ return "aarch64-managarm-" + TargetTriple.getEnvironmentName().str();
+ case llvm::Triple::riscv64:
+ return "riscv64-managarm-" + TargetTriple.getEnvironmentName().str();
+ }
+}
+
+static StringRef getOSLibDir(const llvm::Triple &Triple, const ArgList &Args) {
+ // It happens that only x86, PPC and SPARC use the 'lib32' variant of
+ // oslibdir, and using that variant while targeting other architectures causes
+ // problems because the libraries are laid out in shared system roots that
+ // can't cope with a 'lib32' library search path being considered. So we only
+ // enable them when we know we may need it.
+ //
+ // FIXME: This is a bit of a hack. We should really unify this code for
+ // reasoning about oslibdir spellings with the lib dir spellings in the
+ // GCCInstallationDetector, but that is a more significant refactoring.
+ if (Triple.getArch() == llvm::Triple::x86 || Triple.isPPC32() ||
+ Triple.getArch() == llvm::Triple::sparc)
+ return "lib32";
+
+ if (Triple.getArch() == llvm::Triple::x86_64 && Triple.isX32())
+ return "libx32";
+
+ if (Triple.getArch() == llvm::Triple::riscv32)
+ return "lib32";
+
+ return Triple.isArch32Bit() ? "lib" : "lib64";
+}
+
+Managarm::Managarm(const Driver &D, const llvm::Triple &Triple,
+ const ArgList &Args)
+ : Generic_ELF(D, Triple, Args) {
+ GCCInstallation.init(Triple, Args);
+ Multilibs = GCCInstallation.getMultilibs();
+ SelectedMultilibs.assign({GCCInstallation.getMultilib()});
+ std::string SysRoot = computeSysRoot();
+
+ ToolChain::path_list &PPaths = getProgramPaths();
+
+ Generic_GCC::PushPPaths(PPaths);
+
+#ifdef ENABLE_LINKER_BUILD_ID
+ ExtraOpts.push_back("--build-id");
+#endif
+
+ // The selection of paths to try here is designed to match the patterns which
+ // the GCC driver itself uses, as this is part of the GCC-compatible driver.
+ // This was determined by running GCC in a fake filesystem, creating all
+ // possible permutations of these directories, and seeing which ones it added
+ // to the link paths.
+ path_list &Paths = getFilePaths();
+
+ const std::string OSLibDir = std::string(getOSLibDir(Triple, Args));
+ const std::string MultiarchTriple = getMultiarchTriple(D, Triple, SysRoot);
+
+ Generic_GCC::AddMultilibPaths(D, SysRoot, OSLibDir, MultiarchTriple, Paths);
+
+ addPathIfExists(D, concat(SysRoot, "/lib", MultiarchTriple), Paths);
+ addPathIfExists(D, concat(SysRoot, "/lib/..", OSLibDir), Paths);
+ addPathIfExists(D, concat(SysRoot, "/usr/lib", MultiarchTriple), Paths);
+ addPathIfExists(D, concat(SysRoot, "/usr", OSLibDir), Paths);
+
+ Generic_GCC::AddMultiarchPaths(D, SysRoot, OSLibDir, Paths);
+
+ addPathIfExists(D, concat(SysRoot, "/lib"), Paths);
+ addPathIfExists(D, concat(SysRoot, "/usr/lib"), Paths);
+}
+
+bool Managarm::HasNativeLLVMSupport() const { return true; }
+
+Tool *Managarm::buildLinker() const {
+ return new tools::gnutools::Linker(*this);
+}
+
+Tool *Managarm::buildAssembler() const {
+ return new tools::gnutools::Assembler(*this);
+}
+
+std::string Managarm::computeSysRoot() const {
+ if (!getDriver().SysRoot.empty())
+ return getDriver().SysRoot;
+ return std::string();
+}
+
+std::string Managarm::getDynamicLinker(const ArgList &Args) const {
+ switch (getTriple().getArch()) {
+ case llvm::Triple::aarch64:
+ return "/lib/aarch64-managarm/ld.so";
+ case llvm::Triple::riscv64: {
+ StringRef ABIName = tools::riscv::getRISCVABI(Args, getTriple());
+ return ("/lib/riscv64-managarm/ld-riscv64-" + ABIName + ".so").str();
+ }
+ case llvm::Triple::x86_64:
+ return "/lib/x86_64-managarm/ld.so";
+ default:
+ llvm_unreachable("unsupported architecture");
+ }
+}
+
+void Managarm::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
+ ArgStringList &CC1Args) const {
+ const Driver &D = getDriver();
+ std::string SysRoot = computeSysRoot();
+
+ if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc))
+ return;
+
+ if (!DriverArgs.hasArg(options::OPT_nostdlibinc))
+ addSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/local/include");
+
+ // Add 'include' in the resource directory, which is similar to
+ // GCC_INCLUDE_DIR (private headers) in GCC.
+ if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
+ SmallString<128> ResourceDirInclude(D.ResourceDir);
+ llvm::sys::path::append(ResourceDirInclude, "include");
+ addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude);
+ }
+
+ if (DriverArgs.hasArg(options::OPT_nostdlibinc))
+ return;
+
+ // TOOL_INCLUDE_DIR
+ AddMultilibIncludeArgs(DriverArgs, CC1Args);
+
+ // Check for configure-time C include directories.
+ StringRef CIncludeDirs(C_INCLUDE_DIRS);
+ if (CIncludeDirs != "") {
+ SmallVector<StringRef, 5> dirs;
+ CIncludeDirs.split(dirs, ":");
+ for (StringRef dir : dirs) {
+ StringRef Prefix =
+ llvm::sys::path::is_absolute(dir) ? StringRef(SysRoot) : "";
+ addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
+ }
+ return;
+ }
+
+ // On systems using multiarch, add /usr/include/$triple before
+ // /usr/include.
+ std::string MultiarchIncludeDir = getMultiarchTriple(D, getTriple(), SysRoot);
+ if (!MultiarchIncludeDir.empty())
+ addExternCSystemInclude(
+ DriverArgs, CC1Args,
+ concat(SysRoot, "/usr/include", MultiarchIncludeDir));
+
+ // Add an include of '/include' directly. This isn't provided by default by
+ // system GCCs, but is often used with cross-compiling GCCs, and harmless to
+ // add even when Clang is acting as-if it were a system compiler.
+ addExternCSystemInclude(DriverArgs, CC1Args, concat(SysRoot, "/include"));
+
+ addExternCSystemInclude(DriverArgs, CC1Args, concat(SysRoot, "/usr/include"));
+}
+
+void Managarm::addLibStdCxxIncludePaths(
+ const llvm::opt::ArgList &DriverArgs,
+ llvm::opt::ArgStringList &CC1Args) const {
+ // We need a detected GCC installation on Managarm to provide libstdc++'s
+ // headers.
+ if (!GCCInstallation.isValid())
+ return;
+
+ StringRef TripleStr = GCCInstallation.getTriple().str();
+
+ // Try generic GCC detection.
+ Generic_GCC::addGCCLibStdCxxIncludePaths(DriverArgs, CC1Args, TripleStr);
+}
+
+SanitizerMask Managarm::getSupportedSanitizers() const {
+ const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
+ const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;
+ SanitizerMask Res = ToolChain::getSupportedSanitizers();
+ Res |= SanitizerKind::PointerCompare;
+ Res |= SanitizerKind::PointerSubtract;
+ Res |= SanitizerKind::KernelAddress;
+ Res |= SanitizerKind::Vptr;
+ if (IsX86_64)
+ Res |= SanitizerKind::KernelMemory;
+ if (IsX86 || IsX86_64)
----------------
MaskRay wrote:
-fsanitize=function can be enabled for all targets. Linux.cpp has been updated
https://github.com/llvm/llvm-project/pull/139271
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