From e8bf58c17085f6110d7f757d2417d7a96e9d329f Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Sun, 15 Aug 2004 23:21:54 +0000 Subject: Simplify code, make it print the constructed module before it is run. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15792 91177308-0d34-0410-b5e6-96231b3b80d8 --- examples/HowToUseJIT/HowToUseJIT.cpp | 132 ++++++++++++----------------------- 1 file changed, 45 insertions(+), 87 deletions(-) (limited to 'examples') diff --git a/examples/HowToUseJIT/HowToUseJIT.cpp b/examples/HowToUseJIT/HowToUseJIT.cpp index 16f4657c62..e9100cffe6 100644 --- a/examples/HowToUseJIT/HowToUseJIT.cpp +++ b/examples/HowToUseJIT/HowToUseJIT.cpp @@ -10,8 +10,6 @@ // This small program provides an example of how to quickly build a small // module with two functions and execute it with the JIT. // -//===------------------------------------------------------------------------=== - // Goal: // The goal of this snippet is to create in the memory // the LLVM module consisting of two functions as follow: @@ -34,118 +32,78 @@ // conflict of temporary function name with some real // existing function name? // +//===----------------------------------------------------------------------===// -#include - -#include -#include -#include -#include -#include - +#include "llvm/Module.h" +#include "llvm/Constants.h" +#include "llvm/Type.h" +#include "llvm/Instructions.h" +#include "llvm/ModuleProvider.h" #include "llvm/ExecutionEngine/ExecutionEngine.h" #include "llvm/ExecutionEngine/GenericValue.h" - - +#include using namespace llvm; int main() { - // Create some module to put our function into it. Module *M = new Module("test"); + // 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". + // The '0' terminates the list of argument types. + Function *Add1F = M->getOrInsertFunction("add1", Type::IntTy, Type::IntTy, 0); - // We are about to create the add1 function: - Function *Add1F; - - { - // first create type for the single argument of add1 function: - // the type is 'int ()' - std::vector ArgT(1); - ArgT[0] = Type::IntTy; - - // now create full type of the add1 function: - FunctionType *Add1T = FunctionType::get(Type::IntTy, // type of result - ArgT, - /*not vararg*/false); - - // Now create the add1 function entry and - // insert this entry into module M - // (By passing a module as the last parameter to the Function constructor, - // it automatically gets appended to the Module.) - Add1F = new Function(Add1T, - Function::ExternalLinkage, // maybe too much - "add1", M); - - // Add a basic block to the function... (again, it automatically inserts - // because of the last argument.) - BasicBlock *BB = new BasicBlock("EntryBlock of add1 function", Add1F); + // Add a basic block to the function. As before, it automatically inserts + // because of the last argument. + BasicBlock *BB = new BasicBlock("EntryBlock", Add1F); - // Get pointers to the constant `1'... - Value *One = ConstantSInt::get(Type::IntTy, 1); + // Get pointers to the constant `1'. + Value *One = ConstantSInt::get(Type::IntTy, 1); - // Get pointers to the integer argument of the add1 function... - assert(Add1F->abegin() != Add1F->aend()); // Make sure there's an arg - Argument &ArgX = Add1F->afront(); // Get the arg + // Get pointers to the integer argument of the add1 function... + assert(Add1F->abegin() != Add1F->aend()); // Make sure there's an arg + Argument *ArgX = Add1F->abegin(); // Get the arg + ArgX->setName("AnArg"); // Give it a nice symbolic name for fun. - // Create the add instruction... does not insert... - Instruction *Add = BinaryOperator::create(Instruction::Add, One, &ArgX, - "addresult"); - - // explicitly insert it into the basic block... - BB->getInstList().push_back(Add); + // Create the add instruction, inserting it into the end of BB. + Instruction *Add = BinaryOperator::createAdd(One, ArgX, "addresult", BB); - // Create the return instruction and add it to the basic block - BB->getInstList().push_back(new ReturnInst(Add)); + // Create the return instruction and add it to the basic block + new ReturnInst(Add, BB); - // function add1 is ready - } + // Now, function add1 is ready. - // now we going to create function `foo': - Function *FooF; + // Now we going to create function `foo', which returns an int and takes no + // arguments. + Function *FooF = M->getOrInsertFunction("foo", Type::IntTy, 0); - { - // Create the foo function type: - FunctionType *FooT = - FunctionType::get(Type::IntTy, // result has type: 'int ()' - std::vector(), // no arguments - /*not vararg*/false); - - // create the entry for function `foo' and insert - // this entry into module M: - FooF = - new Function(FooT, - Function::ExternalLinkage, // too wide? - "foo", M); - - // Add a basic block to the FooF function... - BasicBlock *BB = new BasicBlock("EntryBlock of add1 function", FooF); + // Add a basic block to the FooF function. + BB = new BasicBlock("EntryBlock", FooF); - // Get pointers to the constant `10'... - Value *Ten = ConstantSInt::get(Type::IntTy, 10); + // Get pointers to the constant `10'. + Value *Ten = ConstantSInt::get(Type::IntTy, 10); - // Put the argument Ten on stack and make call: - // ... - std::vector Params; - Params.push_back(Ten); - CallInst * Add1CallRes = new CallInst(Add1F, Params, "add1", BB); + // Pass Ten to the call call: + std::vector Params; + Params.push_back(Ten); + CallInst * Add1CallRes = new CallInst(Add1F, Params, "add1", BB); - // Create the return instruction and add it to the basic block - BB->getInstList().push_back(new ReturnInst(Add1CallRes)); - - } + // Create the return instruction and add it to the basic block. + new ReturnInst(Add1CallRes, BB); - // Now we going to create JIT ?? + // Now we create the JIT. ExistingModuleProvider* MP = new ExistingModuleProvider(M); - ExecutionEngine* EE = ExecutionEngine::create( MP, true ); + ExecutionEngine* EE = ExecutionEngine::create(MP, true); + + std::cout << "We just constructed this LLVM module:\n\n" << *M; + std::cout << "\n\nRunning foo: " << std::flush; // Call the `foo' function with no arguments: std::vector noargs; GenericValue gv = EE->runFunction(FooF, noargs); - // import result of execution: - std::cout << "Result: " << gv.IntVal << std:: endl; - + // Import result of execution: + std::cout << "Result: " << gv.IntVal << "\n"; return 0; } -- cgit v1.2.3