<div dir="ltr"><div dir="ltr"><div dir="ltr">Hi Stefan,<div><br></div><div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">% ./bin/llvm-jitlink -oop-executor inits.o<br>JIT session error: Symbols not found: [ __ZTIN4llvm6detail14format_adapterE ]</blockquote></div><div><br></div><div>I've been testing with a debug build:</div><div><br></div><div>% xcrun cmake -GNinja -DCMAKE_BUILD_TYPE=Debug -DLLVM_ENABLE_PROJECTS="llvm;clang;compiler-rt" ../llvm</div><div><br></div><div><div>Matching this build might fix the issue, though building with my config (if it works) is only a short-term fix. The error that you're seeing implies that the runtime is dependending on a symbol from libSupport that is not being linked in to the target (llvm-jitlink-executor). I'll aim to break these dependencies on libSupport in the future. Mostly that means either removing the dependence on llvm::Error / llvm::Expected (e.g. by creating stripped down versions for the orc runtime), or making those types header-only.</div></div><div><br></div><div>-- Lang.</div><div><br></div><div><br></div><div><br></div><div><br></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jan 19, 2021 at 12:50 AM Stefan Gränitz <<a href="mailto:stefan.graenitz@gmail.com">stefan.graenitz@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">
  
    
  
  <div>
    Wow, thanks for the update. One more ORC milestone in a short period
    of time!<br>
    <br>
    On macOS I built the C++ example like this:<br>
    <br>
    % cmake -GNinja -DLLVM_TARGETS_TO_BUILD=host
    -DLLVM_ENABLE_PROJECTS="clang;compiler-rt" ../llvm<br>
    % ninja llvm-jitlink llvm-jitlink-executor
    lib/clang/12.0.0/lib/darwin/libclang_rt.orc_osx.a<br>
    % clang++ -c -o inits.o inits.cpp<br>
    <br>
    The in-process version works perfectly, but with the out-of-process
    flag the examples fails:<br>
    <br>
    % ./bin/llvm-jitlink inits.o<br>
    Foo::Foo()<br>
    Foo::foo()<br>
    Foo::~Foo()<br>
    % ./bin/llvm-jitlink -oop-executor inits.o<br>
    JIT session error: Symbols not found: [
    __ZTIN4llvm6detail14format_adapterE ]<br>
    <br>
    Any idea what could go wrong here? Otherwise I can try to debug it
    later this week. (Full error below.)<br>
    <br>
    Best<br>
    Stefan<br>
    <br>
    --<br>
    <br>
    JIT session error: Symbols not found: [
    __ZTIN4llvm6detail14format_adapterE ]<br>
/Users/staefsn/Develop/LLVM/monorepo/llvm-orc-runtime/build/bin/llvm-jitlink:
    Failed to materialize symbols: { (Main, {
    ___orc_rt_macho_symbol_lookup_remote,
__ZN4llvm3orc6shared21WrapperFunctionResult22destroyWithArrayDeleteE39LLVMOrcSharedCWrapperFunctionResultDatay,
__ZNSt3__113__vector_baseIN4llvm3orc6shared25MachOJITDylibInitializersENS_9allocatorIS4_EEED2Ev,
__ZNK4llvm8ExpectedINS_3orc6shared21WrapperFunctionResultEE22fatalUncheckedExpectedEv,
__ZN4llvm3orc6shared21toWrapperFunctionBlobIJNSt3__112basic_stringIcNS3_11char_traitsIcEENS3_9allocatorIcEEEEEEENS1_21WrapperFunctionResultEDpRKT_,
    __ZN4llvm3orc6shared20VectorRawByteChannelD1Ev,
__ZN4llvm3orc6shared21SequenceSerializationINS1_20VectorRawByteChannelEJNSt3__16vectorINS1_25MachOJITDylibInitializers13SectionExtentENS4_9allocatorIS7_EEEESA_SA_EE11deserializeISA_JSA_SA_EEENS_5ErrorERS3_RT_DpRT0_,
__ZNSt3__16vectorIN4llvm3orc6shared25MachOJITDylibInitializers13SectionExtentENS_9allocatorIS5_EEE8__appendEm,
__ZN4llvm3orc6shared21toWrapperFunctionBlobIJyNSt3__112basic_stringIcNS3_11char_traitsIcEENS3_9allocatorIcEEEEEEENS1_21WrapperFunctionResultEDpRKT_,
    __ZN4llvm29VerifyEnableABIBreakingChecksE,
__ZN4llvm15format_providerImvE6formatERKmRNS_11raw_ostreamENS_9StringRefE,
__ZNSt3__114__split_bufferIN4llvm3orc6shared25MachOJITDylibInitializersERNS_9allocatorIS4_EEED2Ev,
    __ZTVN4llvm6detail23provider_format_adapterIRmEE,
__ZN4llvm3orc6shared21SequenceSerializationINS1_20VectorRawByteChannelEJyNSt3__112basic_stringIcNS4_11char_traitsIcEENS4_9allocatorIcEEEEEE9serializeIRKyJRKSA_EEENS_5ErrorERS3_OT_DpOT0_,
    __ZTVN4llvm6detail23provider_format_adapterImEE,
__ZN4llvm6detail23provider_format_adapterImE6formatERNS_11raw_ostreamENS_9StringRefE,
    __ZN4llvm6detail23provider_format_adapterIRmED1Ev,
    ___orc_rt_macho_get_deinitializers_tag,
    __ZN4llvm6detail23provider_format_adapterIRmED0Ev,
    __ZTVN4llvm3orc6shared14RawByteChannelE,
    __ZN6orc_rt12jit_dispatchEPKvN4llvm8ArrayRefIhEE,
    __ZN4llvm3orc6shared20VectorRawByteChannelD0Ev,
    __ZTVN4llvm3orc6shared20VectorRawByteChannelE,
    __ZN4llvm8cantFailENS_5ErrorEPKc,
    __ZN4llvm6detail23provider_format_adapterImED1Ev,
    __ZTVN4llvm6detail23provider_format_adapterIRjEE,
    __ZN4llvm6detail23provider_format_adapterImED0Ev,
__ZN4llvm15format_providerIjvE6formatERKjRNS_11raw_ostreamENS_9StringRefE,
    __ZTSN4llvm3orc6shared14RawByteChannelE,
__ZN4llvm6detail23provider_format_adapterIRjE6formatERNS_11raw_ostreamENS_9StringRefE,
    __ZN4llvm6detail23provider_format_adapterIRjED0Ev,
__ZN4llvm3orc6shared19SerializationTraitsINS1_20VectorRawByteChannelENSt3__16vectorINS1_25MachOJITDylibInitializersENS4_9allocatorIS6_EEEES9_vE11deserializeERS3_RS9_,
    __ZTIN4llvm6detail23provider_format_adapterImEE,
__ZN4llvm6detail15HelperFunctions15consumeHexStyleERNS_9StringRefERNS_13HexPrintStyleE,
    __ZTIN4llvm6detail23provider_format_adapterIRmEE,
    ___orc_rt_macho_get_initializers_tag,
    __ZTSN4llvm6detail23provider_format_adapterImEE,
    __ZN4llvm3orc6shared20VectorRawByteChannel4sendEv,
__ZN4llvm6detail23provider_format_adapterIRmE6formatERNS_11raw_ostreamENS_9StringRefE,
    ___orc_rt_macho_symbol_lookup_tag,
    __ZTSN4llvm6detail23provider_format_adapterIRmEE,
    __ZN4llvm3orc6shared20VectorRawByteChannel11appendBytesEPKcj,
    __ZTSN4llvm6detail23provider_format_adapterIRjEE,
    __ZN4llvm3orc6shared20VectorRawByteChannel9readBytesEPcj,
    __ZTSN4llvm3orc6shared20VectorRawByteChannelE,
    __ZN4llvm6detail23provider_format_adapterIRjED1Ev,
    __ZN4llvm3orc6shared14RawByteChannelD1Ev,
__ZN4llvm3orc6shared23fromWrapperFunctionBlobIJNSt3__16vectorINS1_25MachOJITDylibInitializersENS3_9allocatorIS5_EEEEEEENS_5ErrorENS_8ArrayRefIhEEDpRT_,
    __ZN4llvm3orc6shared14RawByteChannelD0Ev,
__ZN4llvm3orc6shared21SequenceSerializationINS1_20VectorRawByteChannelEJyyNSt3__16vectorINS1_25MachOJITDylibInitializers13SectionExtentENS4_9allocatorIS7_EEEESA_SA_EE11deserializeIyJySA_SA_SA_EEENS_5ErrorERS3_RT_DpRT0_,
__ZNSt3__16vectorIN4llvm3orc6shared25MachOJITDylibInitializersENS_9allocatorIS4_EEE8__appendEm,
__ZN4llvm3orc6shared21SequenceSerializationINS1_20VectorRawByteChannelEJyyEE11deserializeIyJyEEENS_5ErrorERS3_RT_DpRT0_,
__ZNSt3__16vectorIN4llvm3orc6shared25MachOJITDylibInitializersENS_9allocatorIS4_EEE6resizeEm,
__ZN4llvm3orc6shared19SerializationTraitsINS1_20VectorRawByteChannelENSt3__112basic_stringIcNS4_11char_traitsIcEENS4_9allocatorIcEEEESA_vE11deserializeERNS1_14RawByteChannelERSA_,
__ZN4llvm3orc6shared23fromWrapperFunctionBlobIJyEEENS_5ErrorENS_8ArrayRefIhEEDpRT_,
    __ZTIN4llvm6detail23provider_format_adapterIRjEE,
    __ZN4llvm3orc6shared21WrapperFunctionResult20getAnyOutOfBandErrorEv,
    __ZTIN4llvm3orc6shared20VectorRawByteChannelE,
    ___orc_rt_macho_get_initializers_remote,
    __ZTIN4llvm3orc6shared14RawByteChannelE,
__ZNSt3__16vectorIhNS_9allocatorIhEEE26__swap_out_circular_bufferERNS_14__split_bufferIhRS2_EE,
__ZN4llvm3orc6shared19SerializationTraitsINS1_20VectorRawByteChannelENSt3__16vectorINS1_25MachOJITDylibInitializers13SectionExtentENS4_9allocatorIS7_EEEESA_vE11deserializeERS3_RSA_
    }) }<br>
/Users/staefsn/Develop/LLVM/monorepo/llvm-orc-runtime/build/bin/llvm-jitlink-executor:Response
    has unknown sequence number 527162<br>
    <br>
    <div>On 18/01/2021 08:55, Lang Hames wrote:<br>
    </div>
    <blockquote type="cite">
      
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                                                          <div dir="ltr">Hi
                                                          All,</div>
                                                          <div dir="ltr"><br>
                                                          </div>
                                                          <div dir="ltr">Happy
                                                          2021!<br>
                                                          <div><br>
                                                          </div>
                                                          <div>I've just
                                                          posted a new
                                                          Orc Runtime
                                                          Preview patch:
                                                          <a href="https://github.com/lhames/llvm-project/commit/8833a7f24693f1c7a3616438718e7927c6624894" target="_blank">https://github.com/lhames/llvm-project/commit/8833a7f24693f1c7a3616438718e7927c6624894</a></div>
                                                          <div><br>
                                                          </div>
                                                          <div>Quick
                                                          background:</div>
                                                          <div><br>
                                                          </div>
                                                          <div>To date,
                                                          neither ORC
                                                          nor MCJIT have
                                                          had their own
                                                          runtime
                                                          libraries.
                                                          This has
                                                          limited and
                                                          complicated
                                                          the
                                                          implementation
                                                          of many
                                                          features (e.g.
                                                          jit re-entry
                                                          functions,
                                                          exception
                                                          handling,
                                                          JID'd
                                                          initializers
                                                          and
                                                          de-initializers),
                                                          and
                                                          more-or-less
                                                          prevented the
                                                          implementation
                                                          of others
                                                          (e.g. native
                                                          thread local
                                                          storage).</div>
                                                          <div><br>
                                                          </div>
                                                          <div>Late last
                                                          year I started
                                                          work on a
                                                          prototype ORC
                                                          runtime
                                                          library to
                                                          address this,
                                                          and with the
                                                          above commit
                                                          I've finally
                                                          got something
                                                          worth sharing.</div>
                                                          <div><br>
                                                          </div>
                                                          <div>The
                                                          prototype
                                                          above is
                                                          simultaneously
                                                          limited and
                                                          complex.
                                                          Limited, in
                                                          that it only
                                                          tackles a
                                                          small subset
                                                          of the desired
                                                          functionality.
                                                          Complex in
                                                          that it's one
                                                          of the most
                                                          involved
                                                          pieces of
                                                          functionality
                                                          that I
                                                          anticipate
                                                          supporting, as
                                                          it requires
                                                          two-way
                                                          communication
                                                          between the
                                                          executor and
                                                          JIT processes.
                                                          My aim in
                                                          choosing to
                                                          tackle the
                                                          hard part
                                                          first was to
                                                          get a sense of
                                                          our ultimate
                                                          requirements
                                                          for the
                                                          project,
                                                          particularly
                                                          in regards to
                                                          <i>where it
                                                          should live
                                                          within the
                                                          LLVM Project</i>.
                                                          It's not a
                                                          perfect fit
                                                          for LLVM
                                                          proper: there
                                                          will be lots
                                                          of target
                                                          specific code,
                                                          including
                                                          assembly, and
                                                          it should be
                                                          easily
                                                          buildable for
                                                          multiple
                                                          targets (that
                                                          sounds more
                                                          like
                                                          compiler-rt).
                                                          On the other
                                                          hand it's not
                                                          a perfect fit
                                                          for
                                                          compiler-rt:
                                                          it shares data
                                                          structures
                                                          with LLVM, and
                                                          it would be
                                                          very useful to
                                                          be able to
                                                          re-use
                                                          llvm::Error  /
                                                          llvm::Expected
                                                          (that sounds
                                                          like LLVM). At
                                                          the moment I
                                                          think the best
                                                          way to square
                                                          things would
                                                          be to keep it
                                                          in
                                                          compiler-rt,
                                                          allow
                                                          inclusion of
                                                          header-only
                                                          code from LLVM
                                                          in
                                                          compiler-rt,
                                                          and then make
                                                          Error /
                                                          Expected
                                                          header-only
                                                          (or copy /
                                                          adapt them for
                                                          this library).
                                                          This will be a
                                                          discussion for
                                                          llvm-dev at
                                                          some point in
                                                          the near
                                                          future.</div>
                                                          <div><br>
                                                          </div>
                                                          <div>On to the
                                                          actual
                                                          functionality
                                                          though: The
                                                          prototype
                                                          makes
                                                          significant
                                                          changes to the
                                                          MachOPlatform
                                                          class and
                                                          introduces an
                                                          ORC runtime
                                                          library in
                                                          compiler-rt/lib/orc.
                                                          Together,
                                                          these changes
                                                          allow us to
                                                          emulate the
                                                          dlopen / dlsym
                                                          / dlclose in
                                                          the JIT
                                                          executor
                                                          process. We
                                                          can use this
                                                          to define what
                                                          it means to
                                                          run a <i>JIT
                                                          program</i>,
                                                          rather than
                                                          just running a
                                                          JIT function
                                                          (the way
                                                          TargetProcessControl::runAsMain
                                                          does):</div>
                                                          <div><br>
                                                          </div>
                                                          <div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">ORC_RT_INTERFACE <font color="#38761d">int64_t</font> <font color="#0b5394">__orc_rt_macho_run_program</font>(<font color="#38761d">int</font> <font color="#bf9000">argc</font>, <font color="#38761d">char</font> *<font color="#bf9000">argv</font>[])
                                                          {</font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">  <font color="#45818e">using</font> <font color="#38761d">MainTy</font> = <font color="#38761d">int</font> (*)(<font color="#38761d">int</font>, <font color="#38761d">char</font> *[]);</font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace"><br>
                                                          </font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">  <font color="#38761d">void</font> *<font color="#bf9000">H</font> =
__orc_rt_macho_jit_dlopen(<font color="#6aa84f">"Main"</font>,
                                                          ORC_RT_RTLD_LAZY);</font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">  <font color="#45818e">if</font> (!H) {</font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">    __orc_rt_log_error(__orc_rt_macho_jit_dlerror());</font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">    <font color="#45818e">return</font> -1;</font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">  }</font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace"><br>
                                                          </font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">  <font color="#45818e">auto</font> *<font color="#bf9000">Main</font> = <font color="#45818e">reinterpret_cast</font><<font color="#38761d">MainTy</font>>(__orc_rt_macho_jit_dlsym(H, <font color="#6aa84f">"main"</font>));</font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">  <font color="#45818e">if</font> (!Main) {<br>
                                                          </font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">    __orc_rt_log_error(__orc_rt_macho_jit_dlerror());</font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">    <font color="#45818e">return</font> -1;</font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">  }</font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace"><br>
                                                          </font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">  <font color="#38761d">int</font> <font color="#bf9000">Result</font> =
                                                          Main(argc,
                                                          argv);</font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace"><br>
                                                          </font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">  <font color="#45818e">if</font> (__orc_rt_macho_jit_dlclose(H)
                                                          == -1)</font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">    __orc_rt_log_error(__orc_rt_macho_jit_dlerror());</font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace"><br>
                                                          </font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">  <font color="#45818e">return</font> Result;</font></div>
                                                          <div style="color:rgb(0,0,0)"><font face="monospace">}</font></div>
                                                          </div>
                                                          <div><br>
                                                          </div>
                                                          <div>The
                                                          functions __orc_rt_macho_jit_dlopen, __orc_rt_macho_jit_dlsym,
and __orc_rt_macho_jit_dlclose behave the same as their dlfcn.h
                                                          counterparts
                                                          (dlopen,
                                                          dlsym,
                                                          dlclose), but
                                                          operate on
                                                          JITDylibs
                                                          rather than
                                                          regular
                                                          dylibs. This
                                                          includes
                                                          running static
                                                          initializers
                                                          and
                                                          registering
                                                          with language
                                                          runtimes (e.g.
                                                          ObjC). </div>
                                                          <div><br>
                                                          </div>
                                                          <div>While we
                                                          could run
                                                          static
                                                          initializers
                                                          before (e.g.
                                                          via
                                                          LLJIT::runConstructors),
                                                          we had to
                                                          initiate this
                                                          from the JIT
                                                          process side,
                                                          which has two
                                                          significant
                                                          drawbacks: (1)
                                                          Extra RPC
                                                          round trips,
                                                          and (2) in the
                                                          out-of-process
                                                          case:
                                                          initializers
                                                          not running on
                                                          the executor
                                                          thread that
                                                          requested
                                                          them, since
                                                          that thread
                                                          will be
                                                          blocked
                                                          waiting for
                                                          its call to
                                                          return. Issue
                                                          (1) only
                                                          affects
                                                          performance,
                                                          but (2) can
                                                          affect
                                                          correctness if
                                                          the
                                                          initializers
                                                          modify thread
                                                          local values,
                                                          or interact
                                                          with locks or
                                                          threads.
                                                          Interacting
                                                          with threads
                                                          from
                                                          initializers
                                                          is generally
                                                          best avoided,
                                                          but
                                                          nonetheless is
                                                          done by
                                                          real-world
                                                          code, so we
                                                          want to
                                                          support it. By
                                                          using the
                                                          runtime we can
                                                          improve both
                                                          performance
                                                          and
                                                          correctness
                                                          (or at least
                                                          consistency
                                                          with current
                                                          behavior). </div>
                                                          <div><br>
                                                          </div>
                                                          <div>The
                                                          effect of this
                                                          is that we can
                                                          now load C++,
                                                          Objective-C
                                                          and Swift
                                                          programs in
                                                          the JIT and
                                                          expect them to
                                                          run correctly,
                                                          at least for
                                                          simple cases.
                                                          This works
                                                          regardless of
                                                          whether the
                                                          JIT'd code
                                                          runs
                                                          in-process or
out-of-process. To test all this I have integrated support for the
                                                          prototype
                                                          runtime into
                                                          llvm-jitlink.
                                                          You can demo
                                                          output from
                                                          this tool
                                                          below for two
                                                          simple input
                                                          programs: One
                                                          swift, one
                                                          C++. All of
                                                          this is MachO
                                                          specific at
                                                          the moment,
                                                          but provides a
                                                          template that
                                                          could be
                                                          easily re-used
                                                          to support
                                                          this on ELF
                                                          platforms, and
                                                          likely on COFF
                                                          platforms too.<br>
                                                          </div>
                                                          <div><br>
                                                          </div>
                                                          <div>While the
                                                          discussion on
                                                          where the
                                                          runtime should
                                                          live plays out
                                                          I will
                                                          continue
                                                          adding /
                                                          moving
                                                          functionality
                                                          to the
                                                          prototype
                                                          runtime. Next
                                                          up will be
                                                          eh-frame
                                                          registration
                                                          and resolver
                                                          functions
                                                          (both
                                                          currently in
                                                          OrcTargetProcess).
                                                          After that
                                                          I'll try to
                                                          tackle support
                                                          for native
                                                          MachO thread
                                                          local storage.</div>
                                                          <div><br>
                                                          </div>
                                                          <div>As
                                                          always:
                                                          Questions and
                                                          comments are
                                                          very welcome.</div>
                                                          <div><br>
                                                          </div>
                                                          <div>-- Lang.</div>
                                                          <div><br>
                                                          </div>
                                                          <div>
                                                          <div style="color:rgb(0,0,0)">
                                                          <div><font face="monospace">lhames@Langs-MacBook-Pro
                                                          scratch % cat
                                                          foo.swift</font></div>
                                                          <div><font face="monospace">class
                                                          MyClass {</font></div>
                                                          <div><font face="monospace"> 
                                                          func foo() {</font></div>
                                                          <div><font face="monospace"> 
                                                            print("foo")</font></div>
                                                          <div><font face="monospace"> 
                                                          }</font></div>
                                                          <div><font face="monospace">}</font></div>
                                                          <div><font face="monospace"><br>
                                                          </font></div>
                                                          <div><font face="monospace">let
                                                          m = MyClass()</font></div>
                                                          <div><font face="monospace">m.foo();</font></div>
                                                          <div><font face="monospace"><br>
                                                          </font></div>
                                                          <div><font face="monospace">lhames@Langs-MacBook-Pro
                                                          scratch %
                                                          xcrun swiftc
                                                          -emit-object
                                                          -o foo.o
                                                          foo.swift    
                                                                       
                                                                       
                                                             </font></div>
                                                          <div><font face="monospace">lhames@Langs-MacBook-Pro
                                                          scratch %
                                                          llvm-jitlink
                                                          -dlopen
                                                          /usr/lib/swift/libswiftCore.dylib
                                                          foo.o        
                                                               </font></div>
                                                          <div><font face="monospace">foo</font></div>
                                                          <div><font face="monospace">lhames@Langs-MacBook-Pro
                                                          scratch %
                                                          llvm-jitlink
                                                          -oop-executor
                                                          -dlopen
                                                          /usr/lib/swift/libswiftCore.dylib
                                                          foo.o</font></div>
                                                          <div><font face="monospace">foo</font></div>
                                                          <div><font face="monospace">lhames@Langs-MacBook-Pro
                                                          scratch % cat
                                                          inits.cpp </font></div>
                                                          <div><font face="monospace">#include
<iostream></font></div>
                                                          <div><font face="monospace"><br>
                                                          </font></div>
                                                          <div><font face="monospace">class
                                                          Foo {</font></div>
                                                          <div><font face="monospace">public:</font></div>
                                                          <div><font face="monospace"> 
                                                          Foo() {
                                                          std::cout
                                                          <<
                                                          "Foo::Foo()\n";
                                                          }</font></div>
                                                          <div><font face="monospace"> 
                                                          ~Foo() {
                                                          std::cout
                                                          <<
                                                          "Foo::~Foo()\n";
                                                          }</font></div>
                                                          <div><font face="monospace"> 
                                                          void foo() {
                                                          std::cout
                                                          <<
                                                          "Foo::foo()\n";
                                                          }</font></div>
                                                          <div><font face="monospace">};</font></div>
                                                          <div><font face="monospace"><br>
                                                          </font></div>
                                                          <div><font face="monospace">Foo
                                                          F;</font></div>
                                                          <div><font face="monospace"><br>
                                                          </font></div>
                                                          <div><font face="monospace">int
                                                          main(int argc,
                                                          char *argv[])
                                                          {</font></div>
                                                          <div><font face="monospace"> 
                                                          F.foo();</font></div>
                                                          <div><font face="monospace"> 
                                                          return 0;</font></div>
                                                          <div><font face="monospace">}</font></div>
                                                          <div><font face="monospace">lhames@Langs-MacBook-Pro
                                                          scratch %
                                                          xcrun clang++
                                                          -c -o inits.o
                                                          inits.cpp</font></div>
                                                          <div><font face="monospace">lhames@Langs-MacBook-Pro
                                                          scratch %
                                                          llvm-jitlink
                                                          inits.o      
                                                                       
                                                                       
                                                                       
                                                               </font></div>
                                                          <div><font face="monospace">Foo::Foo()</font></div>
                                                          <div><font face="monospace">Foo::foo()</font></div>
                                                          <div><font face="monospace">Foo::~Foo()</font></div>
                                                          <div><font face="monospace">lhames@Langs-MacBook-Pro
                                                          scratch %
                                                          llvm-jitlink
                                                          -oop-executor
                                                          inits.o</font></div>
                                                          <div><font face="monospace">Foo::Foo()</font></div>
                                                          <div><font face="monospace">Foo::foo()</font></div>
                                                          <div><font face="monospace">Foo::~Foo()</font></div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                          </div>
                                                        </div>
                                                      </div>
                                                    </div>
                                                  </div>
                                                </div>
                                              </div>
                                            </div>
                                          </div>
                                        </div>
                                      </div>
                                    </div>
                                  </div>
                                </div>
                              </div>
                            </div>
                          </div>
                        </div>
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </blockquote>
    <pre cols="72">-- 
<a href="https://flowcrypt.com/pub/stefan.graenitz@gmail.com" target="_blank">https://flowcrypt.com/pub/stefan.graenitz@gmail.com</a></pre>
  </div>

</blockquote></div>