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//===------ OrcLazyJIT.cpp - Basic Orc-based JIT for lazy execution -------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "OrcLazyJIT.h"
#include "llvm/ExecutionEngine/Orc/OrcTargetSupport.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/DynamicLibrary.h"
#include <system_error>
using namespace llvm;
namespace {
enum class DumpKind { NoDump, DumpFuncsToStdOut, DumpModsToStdErr,
DumpModsToDisk };
cl::opt<DumpKind> OrcDumpKind("orc-lazy-debug",
cl::desc("Debug dumping for the orc-lazy JIT."),
cl::init(DumpKind::NoDump),
cl::values(
clEnumValN(DumpKind::NoDump, "no-dump",
"Don't dump anything."),
clEnumValN(DumpKind::DumpFuncsToStdOut,
"funcs-to-stdout",
"Dump function names to stdout."),
clEnumValN(DumpKind::DumpModsToStdErr,
"mods-to-stderr",
"Dump modules to stderr."),
clEnumValN(DumpKind::DumpModsToDisk,
"mods-to-disk",
"Dump modules to the current "
"working directory. (WARNING: "
"will overwrite existing files)."),
clEnumValEnd));
}
OrcLazyJIT::CallbackManagerBuilder
OrcLazyJIT::createCallbackManagerBuilder(Triple T) {
switch (T.getArch()) {
default: return nullptr;
case Triple::x86_64: {
typedef orc::JITCompileCallbackManager<IRDumpLayerT,
orc::OrcX86_64> CCMgrT;
return [](IRDumpLayerT &IRDumpLayer, RuntimeDyld::MemoryManager &MemMgr,
LLVMContext &Context) {
return llvm::make_unique<CCMgrT>(IRDumpLayer, MemMgr, Context, 0,
64);
};
}
}
}
OrcLazyJIT::TransformFtor OrcLazyJIT::createDebugDumper() {
switch (OrcDumpKind) {
case DumpKind::NoDump:
return [](std::unique_ptr<Module> M) { return std::move(M); };
case DumpKind::DumpFuncsToStdOut:
return [](std::unique_ptr<Module> M) {
printf("[ ");
for (const auto &F : *M) {
if (F.isDeclaration())
continue;
if (F.hasName()) {
std::string Name(F.getName());
printf("%s ", Name.c_str());
} else
printf("<anon> ");
}
printf("]\n");
return std::move(M);
};
case DumpKind::DumpModsToStdErr:
return [](std::unique_ptr<Module> M) {
dbgs() << "----- Module Start -----\n" << *M
<< "----- Module End -----\n";
return std::move(M);
};
case DumpKind::DumpModsToDisk:
return [](std::unique_ptr<Module> M) {
std::error_code EC;
raw_fd_ostream Out(M->getModuleIdentifier() + ".ll", EC,
sys::fs::F_Text);
if (EC) {
errs() << "Couldn't open " << M->getModuleIdentifier()
<< " for dumping.\nError:" << EC.message() << "\n";
exit(1);
}
Out << *M;
return std::move(M);
};
}
llvm_unreachable("Unknown DumpKind");
}
int llvm::runOrcLazyJIT(std::unique_ptr<Module> M, int ArgC, char* ArgV[]) {
// Add the program's symbols into the JIT's search space.
if (sys::DynamicLibrary::LoadLibraryPermanently(nullptr)) {
errs() << "Error loading program symbols.\n";
return 1;
}
// Grab a target machine and try to build a factory function for the
// target-specific Orc callback manager.
auto TM = std::unique_ptr<TargetMachine>(EngineBuilder().selectTarget());
auto &Context = getGlobalContext();
auto CallbackMgrBuilder =
OrcLazyJIT::createCallbackManagerBuilder(Triple(TM->getTargetTriple()));
// If we couldn't build the factory function then there must not be a callback
// manager for this target. Bail out.
if (!CallbackMgrBuilder) {
errs() << "No callback manager available for target '"
<< TM->getTargetTriple() << "'.\n";
return 1;
}
// Everything looks good. Build the JIT.
OrcLazyJIT J(std::move(TM), Context, CallbackMgrBuilder);
// Add the module, look up main and run it.
auto MainHandle = J.addModule(std::move(M));
auto MainSym = J.findSymbolIn(MainHandle, "main");
if (!MainSym) {
errs() << "Could not find main function.\n";
return 1;
}
typedef int (*MainFnPtr)(int, char*[]);
auto Main = OrcLazyJIT::fromTargetAddress<MainFnPtr>(MainSym.getAddress());
return Main(ArgC, ArgV);
}
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