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Add 'xo-jit/' from commit '855887df71'

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git-subtree-dir: xo-jit
git-subtree-mainline: 35555df976
git-subtree-split: 855887df71
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Roland Conybeare 2025-05-11 01:54:47 -05:00
commit 757dfed99c
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45
xo-jit/example/ex3_fptr/ex3_fptr.cpp Normal file
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#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
}