Roland Conybeare
757dfed99c
git-subtree-dir: xo-jit git-subtree-mainline:35555df976git-subtree-split:855887df71
45 lines
1.7 KiB
C++
45 lines
1.7 KiB
C++
#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/Support/raw_ostream.h"
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int main() {
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llvm::LLVMContext context;
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llvm::IRBuilder<> builder(context);
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llvm::Module *module = new llvm::Module("top", context);
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// Create main function and basic block
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llvm::FunctionType *functionType = llvm::FunctionType::get(builder.getInt32Ty(), false);
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llvm::Function *mainFunction = llvm::Function::Create(functionType, llvm::Function::ExternalLinkage, "main", module);
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llvm::BasicBlock *entry = llvm::BasicBlock::Create(context, "entrypoint", mainFunction);
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builder.SetInsertPoint(entry);
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// Create a global string pointer
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llvm::Value *helloWorld = builder.CreateGlobalStringPtr("hello world\n");
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// Create function pointer for puts
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std::vector<llvm::Type *> putArgs;
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putArgs.push_back(builder.getInt8Ty()->getPointerTo());
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llvm::ArrayRef<llvm::Type *> argsRef(putArgs);
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llvm::FunctionType *putsType = llvm::FunctionType::get(builder.getInt32Ty(), argsRef, false);
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/* = FunctionType + Callee-pointer */
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llvm::FunctionCallee putFunction_callee = module->getOrInsertFunction("puts", putsType);
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#ifdef NOT_YET
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llvm::Constant * putFunction = llvm::Constant
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// Allocate memory for the function pointer
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llvm::Value *p = builder.CreateAlloca(putFunction->getType(), nullptr, "p");
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builder.CreateStore(putFunction, p, false);
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// Load the function pointer and call it
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llvm::Value *temp = builder.CreateLoad(p);
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builder.CreateCall(temp, helloWorld);
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// Return 0 to complete the main function
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builder.CreateRet(llvm::ConstantInt::get(builder.getInt32Ty(), 0));
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// Print the module (IR code)
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module->print(llvm::errs(), nullptr);
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#endif
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}
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