xo-jit: + 2 examples

example/ex3_fptr/CMakeLists.txt

@@ -0,0 +1,12 @@
+# xo-jit/example/ex3_fptr/CMakeLists.txt
+
+set(SELF_EXE xo_fptr_ex3)
+set(SELF_SRCS ex3_fptr.cpp)
+
+if (XO_ENABLE_EXAMPLES)
+    xo_add_executable(${SELF_EXE} ${SELF_SRCS})
+    xo_self_dependency(${SELF_EXE} xo_jit)
+    #xo_dependency(${SELF_EXE} xo_expression)
+endif()
+
+# end CMakeLists.txt

example/ex3_fptr/ex3_fptr.cpp

@@ -0,0 +1,45 @@
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/IRBuilder.h"
+
+#include "llvm/Support/raw_ostream.h"
+
+int main() {
+    llvm::LLVMContext context;
+    llvm::IRBuilder<> builder(context);
+    llvm::Module *module = new llvm::Module("top", context);
+
+    // Create main function and basic block
+    llvm::FunctionType *functionType = llvm::FunctionType::get(builder.getInt32Ty(), false);
+    llvm::Function *mainFunction = llvm::Function::Create(functionType, llvm::Function::ExternalLinkage, "main", module);
+    llvm::BasicBlock *entry = llvm::BasicBlock::Create(context, "entrypoint", mainFunction);
+    builder.SetInsertPoint(entry);
+
+    // Create a global string pointer
+    llvm::Value *helloWorld = builder.CreateGlobalStringPtr("hello world\n");
+
+    // Create function pointer for puts
+    std::vector<llvm::Type *> putArgs;
+    putArgs.push_back(builder.getInt8Ty()->getPointerTo());
+    llvm::ArrayRef<llvm::Type *> argsRef(putArgs);
+    llvm::FunctionType *putsType = llvm::FunctionType::get(builder.getInt32Ty(), argsRef, false);
+    /* = FunctionType + Callee-pointer */
+    llvm::FunctionCallee putFunction_callee = module->getOrInsertFunction("puts", putsType);
+
+#ifdef NOT_YET
+    llvm::Constant * putFunction = llvm::Constant
+
+    // Allocate memory for the function pointer
+    llvm::Value *p = builder.CreateAlloca(putFunction->getType(), nullptr, "p");
+    builder.CreateStore(putFunction, p, false);
+
+    // Load the function pointer and call it
+    llvm::Value *temp = builder.CreateLoad(p);
+    builder.CreateCall(temp, helloWorld);
+
+    // Return 0 to complete the main function
+    builder.CreateRet(llvm::ConstantInt::get(builder.getInt32Ty(), 0));
+
+    // Print the module (IR code)
+    module->print(llvm::errs(), nullptr);
+#endif
+}