[ORC] Add CallViaEPC and CallSPSViaEPC utilities.

[lhames]

These utilities simplify making typed async calls via ExecutorProcessControl::callWrapperAsync.

CallViaEPC.h provides utilities for making typed async calls using a given Serializer to serialize arguments and deserialize results.

callViaEPC takes a result handler function object (accepting Expected), an EPC reference, a Serializer, a target function address, and arguments. The return type T is inferred from the handler's argument type using CallableTraitsHelper.

EPCCaller wraps an ExecutorProcessControl& and Serializer, simplifying repeated calls with the same serialization.

EPCCall wraps an EPCCaller and target function address, simplifying repeated calls to a specific wrapper function.

CallSPSViaEPC.h provides utilities for using CallViaEPC with SPS serialization.

SPSCallSerializer is a CallViaEPC-compatible serializer using SPS.

SPSEPCCaller takes an SPS function signature as its template argument and applies SPS serialization to arguments and return values.

SPSEPCCall wraps an SPSCaller and a target function address, simplifying repeated calls to a specific SPS wrapper function.

[llvm-ci]

LLVM Buildbot has detected a new failure on builder ppc64le-flang-rhel-clang running on ppc64le-flang-rhel-test while building llvm at step 3 "clean-build-dir".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/157/builds/42727

Here is the relevant piece of the build log for the reference

Step 3 (clean-build-dir) failure: Delete failed. (failure) (timed out)
Step 4 (cmake-configure) failure: cmake (failure) (timed out)
command timed out: 1200 seconds without output running [b'cmake', b'-DLLVM_TARGETS_TO_BUILD=PowerPC', b'-DLLVM_INSTALL_UTILS=ON', b'-DCMAKE_CXX_STANDARD=17', b'-DLLVM_LIT_ARGS=-vj 256', b'-DFLANG_ENABLE_WERROR=ON', b'-DLLVM_ENABLE_ASSERTIONS=ON', b'-DCMAKE_C_COMPILER_LAUNCHER=ccache', b'-DCMAKE_CXX_COMPILER_LAUNCHER=ccache', b'-DLLVM_ENABLE_PROJECTS=flang;llvm;mlir;clang', b'-DLLVM_ENABLE_RUNTIMES=flang-rt;openmp', b'-DCMAKE_BUILD_TYPE=Release', b'-GNinja', b'../llvm-project/llvm'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1200.445931

[llvm-ci]

LLVM Buildbot has detected a new failure on builder reverse-iteration running on hexagon-build-03 while building llvm at step 6 "check_all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/110/builds/6629

Here is the relevant piece of the build log for the reference

Step 6 (check_all) failure: test (failure)
******************** TEST 'Clang :: Interpreter/dynamic-library.cpp' FAILED ********************
Exit Code: 2

Command Output (stdout):
--
# RUN: at line 17
cat /local/mnt/workspace/bots/hexagon-build-03/reverse-iteration/llvm.src/clang/test/Interpreter/dynamic-library.cpp | env LD_LIBRARY_PATH=/local/mnt/workspace/bots/hexagon-build-03/reverse-iteration/llvm.src/clang/test/Interpreter/Inputs:$LD_LIBRARY_PATH /local/mnt/workspace/bots/hexagon-build-03/reverse-iteration/llvm.obj/bin/clang-repl | /local/mnt/workspace/bots/hexagon-build-03/reverse-iteration/llvm.obj/bin/FileCheck /local/mnt/workspace/bots/hexagon-build-03/reverse-iteration/llvm.src/clang/test/Interpreter/dynamic-library.cpp
# executed command: cat /local/mnt/workspace/bots/hexagon-build-03/reverse-iteration/llvm.src/clang/test/Interpreter/dynamic-library.cpp
# .---command stdout------------
# | // REQUIRES: host-supports-jit, x86_64-linux
# | 
# | // To generate libdynamic-library-test.so :
# | // clang -xc++ -o libdynamic-library-test.so -fPIC -shared
# | //
# | // extern "C" {
# | //
# | // int ultimate_answer = 0;
# | // 
# | // int calculate_answer() {
# | //   ultimate_answer = 42;
# | //   return 5;
# | // }
# | //
# | // }
# | 
# | // RUN: cat %s | env LD_LIBRARY_PATH=%S/Inputs:$LD_LIBRARY_PATH clang-repl | FileCheck %s
# | 
# | extern "C" int printf(const char* format, ...);
# | 
# | extern "C" int ultimate_answer;
# | extern "C" int calculate_answer();
# | 
# | %lib libdynamic-library-test.so
# | 
# | printf("Return value: %d\n", calculate_answer());
# | // CHECK: Return value: 5
# | 
# | printf("Variable: %d\n", ultimate_answer);
# | // CHECK-NEXT: Variable: 42
# | 
# | %quit
# `-----------------------------
# executed command: env 'LD_LIBRARY_PATH=/local/mnt/workspace/bots/hexagon-build-03/reverse-iteration/llvm.src/clang/test/Interpreter/Inputs:$LD_LIBRARY_PATH' /local/mnt/workspace/bots/hexagon-build-03/reverse-iteration/llvm.obj/bin/clang-repl
# .---command stderr------------
# | /local/mnt/workspace/bots/hexagon-build-03/reverse-iteration/llvm.obj/bin/clang-repl: error while loading shared libraries: libc++.so.1: cannot open shared object file: No such file or directory
# `-----------------------------
# error: command failed with exit status: 127
# executed command: /local/mnt/workspace/bots/hexagon-build-03/reverse-iteration/llvm.obj/bin/FileCheck /local/mnt/workspace/bots/hexagon-build-03/reverse-iteration/llvm.src/clang/test/Interpreter/dynamic-library.cpp
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
...

[llvm-ci]

LLVM Buildbot has detected a new failure on builder clang-ppc64le-linux-test-suite running on ppc64le-clang-test-suite while building llvm at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/95/builds/19318

Here is the relevant piece of the build log for the reference

Step 6 (test-build-unified-tree-check-all) failure: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
...
PASS: lit :: shtest-shell.py (104405 of 104420)
PASS: lit :: shtest-define.py (104406 of 104420)
PASS: LLVM :: CodeGen/RISCV/attributes.ll (104407 of 104420)
PASS: ThreadSanitizer-powerpc64le :: restore_stack.cpp (104408 of 104420)
PASS: SanitizerCommon-lsan-powerpc64le-Linux :: Linux/signal_segv_handler.cpp (104409 of 104420)
PASS: SanitizerCommon-asan-powerpc64le-Linux :: Linux/signal_segv_handler.cpp (104410 of 104420)
PASS: SanitizerCommon-msan-powerpc64le-Linux :: Linux/signal_segv_handler.cpp (104411 of 104420)
PASS: mlgo-utils :: corpus/extract_ir_script.test (104412 of 104420)
PASS: SanitizerCommon-tsan-powerpc64le-Linux :: Linux/signal_segv_handler.cpp (104413 of 104420)
PASS: SanitizerCommon-ubsan-powerpc64le-Linux :: Linux/signal_segv_handler.cpp (104414 of 104420)
command timed out: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=5882.262956