[Driver] Enable AddressSanitizer for Fuchsia targets

[phosek]

cmake/caches/Fuchsia-stage2.cmake

50

I think we also need:

set(RUNTIMES_${target}-fuchsia_SANITIZER_CXX_ABI "libcxxabi" ON CACHE STRING "")

[mcgrathr]

cmake/caches/Fuchsia-stage2.cmake

50

That seems to default correctly when building it all together.
Should we add it anyway?

[phosek]

cmake/caches/Fuchsia-stage2.cmake

50

You're right, it's set by default so it's not needed.

[phosek]

LGTM

[phosek]

One more thing, would it be possible add a test case to test/Driver/fuchsia.c covering this?

[mcgrathr]

Added tests.

[phosek]

LGTM

[mcgrathr]

Check -dynamic-linker in test.

cmake/caches/Fuchsia-stage2.cmake

foreach(target x86_64;aarch64)
   set(RUNTIMES_${target}-fuchsia_CMAKE_SYSTEM_NAME Fuchsia CACHE STRING "")
   set(RUNTIMES_${target}-fuchsia_UNIX 1 CACHE BOOL "")
   set(RUNTIMES_${target}-fuchsia_LLVM_ENABLE_LIBCXX ON CACHE BOOL "")
   set(RUNTIMES_${target}-fuchsia_LIBUNWIND_USE_COMPILER_RT ON CACHE BOOL "")
   set(RUNTIMES_${target}-fuchsia_LIBCXXABI_USE_COMPILER_RT ON CACHE BOOL "")
   set(RUNTIMES_${target}-fuchsia_LIBCXXABI_USE_LLVM_UNWINDER ON CACHE BOOL "")
   set(RUNTIMES_${target}-fuchsia_LIBCXX_USE_COMPILER_RT ON CACHE BOOL "")
   set(RUNTIMES_${target}-fuchsia_LIBCXX_ABI_VERSION 2 CACHE STRING "")
+  set(RUNTIMES_${target}-fuchsia_SANITIZER_USE_COMPILER_RT ON CACHE BOOL "")
 endforeach()
 
 # Setup toolchain.
 set(LLVM_INSTALL_TOOLCHAIN_ONLY ON CACHE BOOL "")
 set(LLVM_TOOLCHAIN_TOOLS
   llc
   llvm-ar
   llvm-cov

lib/Driver/SanitizerArgs.cpp

SanitizerArgs::SanitizerArgs(const ToolChain &TC,
   // trace-pc w/o func/bb/edge implies edge.
   if ((CoverageFeatures &
        (CoverageTracePC | CoverageTracePCGuard | CoverageInline8bitCounters)) &&
       !(CoverageFeatures & InsertionPointTypes))
     CoverageFeatures |= CoverageEdge;
 
   if (AllAddedKinds & Address) {
     AsanSharedRuntime =
-        Args.hasArg(options::OPT_shared_libasan) || TC.getTriple().isAndroid();
-    NeedPIE |= TC.getTriple().isAndroid();
+        Args.hasArg(options::OPT_shared_libasan) ||
+        TC.getTriple().isAndroid() || TC.getTriple().isOSFuchsia();
+    NeedPIE |= TC.getTriple().isAndroid() || TC.getTriple().isOSFuchsia();
     if (Arg *A =
             Args.getLastArg(options::OPT_fsanitize_address_field_padding)) {
         StringRef S = A->getValue();
         // Legal values are 0 and 1, 2, but in future we may add more levels.
         if (S.getAsInteger(0, AsanFieldPadding) || AsanFieldPadding < 0 ||
             AsanFieldPadding > 2) {
           D.Diag(clang::diag::err_drv_invalid_value) << A->getAsString(Args) << S;
         }
if (AllAddedKinds & Address) {
     AsanUseAfterScope = Args.hasFlag(
         options::OPT_fsanitize_address_use_after_scope,
         options::OPT_fno_sanitize_address_use_after_scope, AsanUseAfterScope);
 
     // As a workaround for a bug in gold 2.26 and earlier, dead stripping of
     // globals in ASan is disabled by default on ELF targets.
     // See https://sourceware.org/bugzilla/show_bug.cgi?id=19002
     AsanGlobalsDeadStripping =
-        !TC.getTriple().isOSBinFormatELF() ||
+        !TC.getTriple().isOSBinFormatELF() || TC.getTriple().isOSFuchsia() ||
         Args.hasArg(options::OPT_fsanitize_address_globals_dead_stripping);
   } else {
     AsanUseAfterScope = false;
   }
 
   // Parse -link-cxx-sanitizer flag.
   LinkCXXRuntimes =
       Args.hasArg(options::OPT_fsanitize_link_cxx_runtime) || D.CCCIsCXX();

lib/Driver/ToolChains/Fuchsia.cpp

 //===--- Fuchsia.cpp - Fuchsia ToolChain Implementations --------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 #include "Fuchsia.h"
 #include "CommonArgs.h"
 #include "clang/Config/config.h"
 #include "clang/Driver/Compilation.h"
 #include "clang/Driver/Driver.h"
 #include "clang/Driver/DriverDiagnostic.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::driver::tools;
 using namespace clang;
 using namespace llvm::opt;
void fuchsia::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   if (Args.hasArg(options::OPT_s))
     CmdArgs.push_back("-s");
 
   if (Args.hasArg(options::OPT_r))
     CmdArgs.push_back("-r");
   else
     CmdArgs.push_back("--build-id");
 
-  if (!Args.hasArg(options::OPT_static))
-    CmdArgs.push_back("--eh-frame-hdr");
 
   if (Args.hasArg(options::OPT_static))
     CmdArgs.push_back("-Bstatic");
   else if (Args.hasArg(options::OPT_shared))
     CmdArgs.push_back("-shared");
 
-  if (!Args.hasArg(options::OPT_static)) {
-    if (Args.hasArg(options::OPT_rdynamic))
-      CmdArgs.push_back("-export-dynamic");
-
-    if (!Args.hasArg(options::OPT_shared)) {
-      CmdArgs.push_back("-dynamic-linker");
-      CmdArgs.push_back(Args.MakeArgString(D.DyldPrefix + "ld.so.1"));
-    }
+    std::string Dyld = D.DyldPrefix;
+    if (ToolChain.getSanitizerArgs().needsAsanRt() &&
+        ToolChain.getSanitizerArgs().needsSharedAsanRt())
+      Dyld += "asan/";
+    Dyld += "ld.so.1";
+    CmdArgs.push_back(Args.MakeArgString(Dyld));
   }
 
   CmdArgs.push_back("-o");
   CmdArgs.push_back(Output.getFilename());
 
   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
     if (!Args.hasArg(options::OPT_shared)) {
       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("Scrt1.o")));
     }
   }
 
   Args.AddAllArgs(CmdArgs, options::OPT_L);
   Args.AddAllArgs(CmdArgs, options::OPT_u);
 
   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
 
+  addSanitizerRuntimes(ToolChain, Args, CmdArgs);
+
   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
 
   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
     if (Args.hasArg(options::OPT_static))
       CmdArgs.push_back("-Bdynamic");
 
     if (D.CCCIsCXX()) {
       if (ToolChain.ShouldLinkCXXStdlib(Args)) {
void Fuchsia::AddCXXStdlibLibArgs(const ArgList &Args,
   case ToolChain::CST_Libstdcxx:
     llvm_unreachable("invalid stdlib name");
   }
 }
 
 SanitizerMask Fuchsia::getSupportedSanitizers() const {
   SanitizerMask Res = ToolChain::getSupportedSanitizers();
   Res |= SanitizerKind::SafeStack;
+  Res |= SanitizerKind::Address;
   return Res;
 }