[llvm] r361435 - Add a HowToUseLLJIT example project.
Lang Hames via llvm-commits
llvm-commits at lists.llvm.org
Wed May 22 14:38:41 PDT 2019
Author: lhames
Date: Wed May 22 14:38:41 2019
New Revision: 361435
URL: http://llvm.org/viewvc/llvm-project?rev=361435&view=rev
Log:
Add a HowToUseLLJIT example project.
A very minimal demo of how to use the LLJIT class, along the lines of the old
HowToUseJIT example.
Added:
llvm/trunk/examples/HowToUseLLJIT/
llvm/trunk/examples/HowToUseLLJIT/CMakeLists.txt
llvm/trunk/examples/HowToUseLLJIT/HowToUseLLJIT.cpp
Modified:
llvm/trunk/examples/CMakeLists.txt
Modified: llvm/trunk/examples/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/examples/CMakeLists.txt?rev=361435&r1=361434&r2=361435&view=diff
==============================================================================
--- llvm/trunk/examples/CMakeLists.txt (original)
+++ llvm/trunk/examples/CMakeLists.txt Wed May 22 14:38:41 2019
@@ -1,6 +1,7 @@
add_subdirectory(BrainF)
add_subdirectory(Fibonacci)
add_subdirectory(HowToUseJIT)
+add_subdirectory(HowToUseLLJIT)
add_subdirectory(Kaleidoscope)
add_subdirectory(ModuleMaker)
Added: llvm/trunk/examples/HowToUseLLJIT/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/examples/HowToUseLLJIT/CMakeLists.txt?rev=361435&view=auto
==============================================================================
--- llvm/trunk/examples/HowToUseLLJIT/CMakeLists.txt (added)
+++ llvm/trunk/examples/HowToUseLLJIT/CMakeLists.txt Wed May 22 14:38:41 2019
@@ -0,0 +1,10 @@
+set(LLVM_LINK_COMPONENTS
+ Core
+ OrcJIT
+ Support
+ nativecodegen
+ )
+
+add_llvm_example(HowToUseLLJIT
+ HowToUseLLJIT.cpp
+ )
Added: llvm/trunk/examples/HowToUseLLJIT/HowToUseLLJIT.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/examples/HowToUseLLJIT/HowToUseLLJIT.cpp?rev=361435&view=auto
==============================================================================
--- llvm/trunk/examples/HowToUseLLJIT/HowToUseLLJIT.cpp (added)
+++ llvm/trunk/examples/HowToUseLLJIT/HowToUseLLJIT.cpp Wed May 22 14:38:41 2019
@@ -0,0 +1,74 @@
+#include "llvm/ExecutionEngine/Orc/LLJIT.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/TargetSelect.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+using namespace llvm::orc;
+
+ExitOnError ExitOnErr;
+
+ThreadSafeModule createDemoModule() {
+ auto Context = llvm::make_unique<LLVMContext>();
+ auto M = make_unique<Module>("test", *Context);
+
+ // Create the add1 function entry and insert this entry into module M. The
+ // function will have a return type of "int" and take an argument of "int".
+ Function *Add1F =
+ Function::Create(FunctionType::get(Type::getInt32Ty(*Context),
+ {Type::getInt32Ty(*Context)}, false),
+ Function::ExternalLinkage, "add1", M.get());
+
+ // Add a basic block to the function. As before, it automatically inserts
+ // because of the last argument.
+ BasicBlock *BB = BasicBlock::Create(*Context, "EntryBlock", Add1F);
+
+ // Create a basic block builder with default parameters. The builder will
+ // automatically append instructions to the basic block `BB'.
+ IRBuilder<> builder(BB);
+
+ // Get pointers to the constant `1'.
+ Value *One = builder.getInt32(1);
+
+ // Get pointers to the integer argument of the add1 function...
+ assert(Add1F->arg_begin() != Add1F->arg_end()); // Make sure there's an arg
+ Argument *ArgX = &*Add1F->arg_begin(); // Get the arg
+ ArgX->setName("AnArg"); // Give it a nice symbolic name for fun.
+
+ // Create the add instruction, inserting it into the end of BB.
+ Value *Add = builder.CreateAdd(One, ArgX);
+
+ // Create the return instruction and add it to the basic block
+ builder.CreateRet(Add);
+
+ return ThreadSafeModule(std::move(M), std::move(Context));
+}
+
+int main(int argc, char *argv[]) {
+ // Initialize LLVM.
+ InitLLVM X(argc, argv);
+
+ InitializeNativeTarget();
+ InitializeNativeTargetAsmPrinter();
+
+ cl::ParseCommandLineOptions(argc, argv, "HowToUseLLJIT");
+ ExitOnErr.setBanner(std::string(argv[0]) + ": ");
+
+ // Create an LLJIT instance.
+ auto J = ExitOnErr(LLJITBuilder().create());
+ auto M = createDemoModule();
+
+ ExitOnErr(J->addIRModule(std::move(M)));
+
+ // Look up the JIT'd function, cast it to a function pointer, then call it.
+ auto Add1Sym = ExitOnErr(J->lookup("add1"));
+ int (*Add1)(int) = (int (*)(int))Add1Sym.getAddress();
+
+ int Result = Add1(42);
+ outs() << "add1(42) = " << Result << "\n";
+
+ return 0;
+}
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