[ORC][ORC_RT] Integrate ORC platforms with LLJIT and lli

This change enables integrating orc::LLJIT with the ORCv2
platforms (MachOPlatform and ELFNixPlatform) and the compiler-rt orc
runtime. Changes include:

- Adding SPS wrapper functions for the orc runtime's dlfcn emulation
  functions, allowing initialization and deinitialization to be invoked
  by LLJIT.

- Changing the LLJIT code generation default to add UseInitArray so
  that .init_array constructors are generated for ELF platforms.

- Integrating the ORCv2 Platforms into lli, and adding a
  PlatformSupport implementation to the LLJIT instance used by lli which
  implements initialization and deinitialization by calling the new
  wrapper functions in the runtime.

Reviewed By: lhames

Differential Revision: https://reviews.llvm.org/D126492

3 files changed, 9 insertions, 0 deletions

diff --git a/llvm/lib/ExecutionEngine/Orc/ELFNixPlatform.cpp b/llvm/lib/ExecutionEngine/Orc/ELFNixPlatform.cpp
index 0185a9d..730e193 100644
--- a/llvm/lib/ExecutionEngine/Orc/ELFNixPlatform.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/ELFNixPlatform.cpp
@@ -263,6 +263,10 @@ ELFNixPlatform::standardRuntimeUtilityAliases() {
   static const std::pair<const char *, const char *>
       StandardRuntimeUtilityAliases[] = {
           {"__orc_rt_run_program", "__orc_rt_elfnix_run_program"},
+          {"__orc_rt_jit_dlerror", "__orc_rt_elfnix_jit_dlerror"},
+          {"__orc_rt_jit_dlopen", "__orc_rt_elfnix_jit_dlopen"},
+          {"__orc_rt_jit_dlclose", "__orc_rt_elfnix_jit_dlclose"},
+          {"__orc_rt_jit_dlsym", "__orc_rt_elfnix_jit_dlsym"},
           {"__orc_rt_log_error", "__orc_rt_log_error_to_stderr"}};
 
   return ArrayRef<std::pair<const char *, const char *>>(
diff --git a/llvm/lib/ExecutionEngine/Orc/JITTargetMachineBuilder.cpp b/llvm/lib/ExecutionEngine/Orc/JITTargetMachineBuilder.cpp
index 0fbf79b..c60f4b3 100644
--- a/llvm/lib/ExecutionEngine/Orc/JITTargetMachineBuilder.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/JITTargetMachineBuilder.cpp
@@ -19,6 +19,7 @@ JITTargetMachineBuilder::JITTargetMachineBuilder(Triple TT)
     : TT(std::move(TT)) {
   Options.EmulatedTLS = true;
   Options.ExplicitEmulatedTLS = true;
+  Options.UseInitArray = true;
 }
 
 Expected<JITTargetMachineBuilder> JITTargetMachineBuilder::detectHost() {
diff --git a/llvm/lib/ExecutionEngine/Orc/MachOPlatform.cpp b/llvm/lib/ExecutionEngine/Orc/MachOPlatform.cpp
index b2de83a..d5274b0 100644
--- a/llvm/lib/ExecutionEngine/Orc/MachOPlatform.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/MachOPlatform.cpp
@@ -302,6 +302,10 @@ MachOPlatform::standardRuntimeUtilityAliases() {
   static const std::pair<const char *, const char *>
       StandardRuntimeUtilityAliases[] = {
           {"___orc_rt_run_program", "___orc_rt_macho_run_program"},
+          {"___orc_rt_jit_dlerror", "___orc_rt_macho_jit_dlerror"},
+          {"___orc_rt_jit_dlopen", "___orc_rt_macho_jit_dlopen"},
+          {"___orc_rt_jit_dlclose", "___orc_rt_macho_jit_dlclose"},
+          {"___orc_rt_jit_dlsym", "___orc_rt_macho_jit_dlsym"},
           {"___orc_rt_log_error", "___orc_rt_log_error_to_stderr"}};
 
   return ArrayRef<std::pair<const char *, const char *>>(