func test() {
llvm.LinkInMCJIT()
llvm.InitializeNativeTarget()
llvm.InitializeNativeAsmPrinter()
mod := llvm.NewModule("fac_module")
// don't do that, because ExecutionEngine takes ownership over module
//defer mod.Dispose()
fac_args := []llvm.Type{llvm.Int32Type()}
fac_type := llvm.FunctionType(llvm.Int32Type(), fac_args, false)
fac := llvm.AddFunction(mod, "fac", fac_type)
fac.SetFunctionCallConv(llvm.CCallConv)
n := fac.Param(0)
entry := llvm.AddBasicBlock(fac, "entry")
iftrue := llvm.AddBasicBlock(fac, "iftrue")
iffalse := llvm.AddBasicBlock(fac, "iffalse")
end := llvm.AddBasicBlock(fac, "end")
builder := llvm.NewBuilder()
defer builder.Dispose()
builder.SetInsertPointAtEnd(entry)
If := builder.CreateICmp(llvm.IntEQ, n, llvm.ConstInt(llvm.Int32Type(), 0, false), "cmptmp")
builder.CreateCondBr(If, iftrue, iffalse)
builder.SetInsertPointAtEnd(iftrue)
res_iftrue := llvm.ConstInt(llvm.Int32Type(), 1, false)
builder.CreateBr(end)
builder.SetInsertPointAtEnd(iffalse)
n_minus := builder.CreateSub(n, llvm.ConstInt(llvm.Int32Type(), 1, false), "subtmp")
call_fac_args := []llvm.Value{n_minus}
call_fac := builder.CreateCall(fac, call_fac_args, "calltmp")
res_iffalse := builder.CreateMul(n, call_fac, "multmp")
builder.CreateBr(end)
builder.SetInsertPointAtEnd(end)
res := builder.CreatePHI(llvm.Int32Type(), "result")
phi_vals := []llvm.Value{res_iftrue, res_iffalse}
phi_blocks := []llvm.BasicBlock{iftrue, iffalse}
res.AddIncoming(phi_vals, phi_blocks)
builder.CreateRet(res)
err := llvm.VerifyModule(mod, llvm.ReturnStatusAction)
if err != nil {
fmt.Println(err)
return
}
engine, err := llvm.NewMCJITCompiler(mod, llvm.MCJITCompilerOptions{OptLevel: 2})
if err != nil {
fmt.Println(err)
return
}
defer engine.Dispose()
pass := llvm.NewPassManager()
defer pass.Dispose()
pass.Add(engine.TargetData())
pass.AddConstantPropagationPass()
pass.AddInstructionCombiningPass()
pass.AddPromoteMemoryToRegisterPass()
pass.AddGVNPass()
pass.AddCFGSimplificationPass()
pass.Run(mod)
mod.Dump()
exec_args := []llvm.GenericValue{llvm.NewGenericValueFromInt(llvm.Int32Type(), 10, false)}
exec_res := engine.RunFunction(fac, exec_args)
fmt.Println("-----------------------------------------")
fmt.Println("Running fac(10) with JIT...")
fmt.Printf("Result: %d\n", exec_res.Int(false))
}
func (compiler *compiler) compile(filenames []string, importpath string) (m *Module, err error) {
buildctx, err := llgobuild.ContextFromTriple(compiler.TargetTriple)
if err != nil {
return nil, err
}
impcfg := &loader.Config{
Fset: token.NewFileSet(),
TypeChecker: types.Config{
Import: llgoimporter.NewImporter(buildctx).Import,
Sizes: compiler.llvmtypes,
},
Build: &buildctx.Context,
}
// Must use parseFiles, so we retain comments;
// this is important for annotation processing.
astFiles, err := parseFiles(impcfg.Fset, filenames)
if err != nil {
return nil, err
}
// If no import path is specified, or the package's
// name (not path) is "main", then set the import
// path to be the same as the package's name.
if pkgname := astFiles[0].Name.String(); importpath == "" || pkgname == "main" {
importpath = pkgname
}
impcfg.CreateFromFiles(importpath, astFiles...)
// Create a "runtime" package too, so we can reference
// its types and functions in the compiler and generated
// code.
if importpath != "runtime" {
astFiles, err := parseRuntime(&buildctx.Context, impcfg.Fset)
if err != nil {
return nil, err
}
impcfg.CreateFromFiles("runtime", astFiles...)
}
iprog, err := impcfg.Load()
if err != nil {
return nil, err
}
program := ssa.Create(iprog, 0)
var mainPkginfo, runtimePkginfo *loader.PackageInfo
if pkgs := iprog.InitialPackages(); len(pkgs) == 1 {
mainPkginfo, runtimePkginfo = pkgs[0], pkgs[0]
} else {
mainPkginfo, runtimePkginfo = pkgs[0], pkgs[1]
}
mainPkg := program.CreatePackage(mainPkginfo)
// Create a Module, which contains the LLVM bitcode.
modulename := importpath
compiler.module = &Module{Module: llvm.NewModule(modulename), Name: modulename}
compiler.module.SetTarget(compiler.TargetTriple)
compiler.module.SetDataLayout(compiler.dataLayout)
// Create a new translation unit.
unit := newUnit(compiler, mainPkg)
// Create the runtime interface.
compiler.runtime, err = newRuntimeInterface(
runtimePkginfo.Pkg,
compiler.module.Module,
compiler.llvmtypes,
FuncResolver(unit),
)
if err != nil {
return nil, err
}
// Create a struct responsible for mapping static types to LLVM types,
// and to runtime/dynamic type values.
compiler.types = NewTypeMap(
importpath,
compiler.llvmtypes,
compiler.module.Module,
compiler.runtime,
MethodResolver(unit),
)
// Create a Builder, for building LLVM instructions.
compiler.builder = llvm.GlobalContext().NewBuilder()
defer compiler.builder.Dispose()
// Initialise debugging.
compiler.debug.module = compiler.module.Module
compiler.debug.Fset = impcfg.Fset
compiler.debug.Sizes = compiler.llvmtypes
mainPkg.Build()
unit.translatePackage(mainPkg)
compiler.processAnnotations(unit, mainPkginfo)
if runtimePkginfo != mainPkginfo {
compiler.processAnnotations(unit, runtimePkginfo)
}
// Finalise debugging.
for _, cu := range compiler.debug.cu {
compiler.module.AddNamedMetadataOperand(
"llvm.dbg.cu",
compiler.debug.MDNode(cu),
)
}
// Export runtime type information.
var exportedTypes []types.Type
for _, m := range mainPkg.Members {
if t, ok := m.(*ssa.Type); ok && ast.IsExported(t.Name()) {
exportedTypes = append(exportedTypes, t.Type())
}
}
compiler.exportRuntimeTypes(exportedTypes, importpath == "runtime")
if importpath == "main" {
// Wrap "main.main" in a call to runtime.main.
if err = compiler.createMainFunction(); err != nil {
return nil, fmt.Errorf("failed to create main.main: %v", err)
}
} else {
if err := llgoimporter.Export(buildctx, mainPkg.Object); err != nil {
return nil, fmt.Errorf("failed to export package data: %v", err)
}
}
return compiler.module, nil
}