func (c *compiler) VisitFuncProtoDecl(f *ast.FuncDecl) *LLVMValue {
if f.Name.Obj != nil {
if result, ok := f.Name.Obj.Data.(*LLVMValue); ok {
return result
}
}
var ftyp *types.Func
fname := f.Name.String()
if f.Recv == nil && fname == "init" {
// Make "init" functions anonymous.
fname = ""
// "init" functions aren't recorded by the parser, so f.Name.Obj is
// not set.
ftyp = &types.Func{ /* no params or result */ }
} else {
ftyp = f.Name.Obj.Type.(*types.Func)
if ftyp.Recv != nil {
recv := ftyp.Recv.Type.(types.Type)
fname = fmt.Sprintf("%s.%s", recv, fname)
} else if c.module.Name != "main" || fname != "main" {
pkgname := c.pkgmap[f.Name.Obj]
fname = pkgname + "." + fname
}
}
// gcimporter may produce multiple AST objects for the same function.
fn := c.module.Module.NamedFunction(fname)
if fn.IsNil() {
llvmftyp := c.types.ToLLVM(ftyp).ElementType()
fn = llvm.AddFunction(c.module.Module, fname, llvmftyp)
if ftyp.Recv != nil {
// Create an interface function if the receiver is
// not a pointer type.
recvtyp := ftyp.Recv.Type.(types.Type)
if _, ptr := recvtyp.(*types.Pointer); !ptr {
returntyp := llvmftyp.ReturnType()
paramtypes := llvmftyp.ParamTypes()
paramtypes[0] = llvm.PointerType(paramtypes[0], 0)
ifntyp := llvm.FunctionType(returntyp, paramtypes, false)
llvm.AddFunction(c.module.Module, "*"+fname, ifntyp)
}
}
}
result := c.NewLLVMValue(fn, ftyp)
if f.Name.Obj != nil {
f.Name.Obj.Data = result
f.Name.Obj.Type = ftyp
}
return result
}
func (c *compiler) defineMemcpyFunction(fn llvm.Value) {
entry := llvm.AddBasicBlock(fn, "entry")
c.builder.SetInsertPointAtEnd(entry)
dst, src, size := fn.Param(0), fn.Param(1), fn.Param(2)
pint8 := llvm.PointerType(llvm.Int8Type(), 0)
dst = c.builder.CreateIntToPtr(dst, pint8, "")
src = c.builder.CreateIntToPtr(src, pint8, "")
sizeType := size.Type()
sizeBits := sizeType.IntTypeWidth()
memcpyName := "llvm.memcpy.p0i8.p0i8.i" + strconv.Itoa(sizeBits)
memcpy := c.module.NamedFunction(memcpyName)
if memcpy.IsNil() {
paramtypes := []llvm.Type{
pint8, pint8, size.Type(), llvm.Int32Type(), llvm.Int1Type()}
memcpyType := llvm.FunctionType(llvm.VoidType(), paramtypes, false)
memcpy = llvm.AddFunction(c.module.Module, memcpyName, memcpyType)
}
args := []llvm.Value{
dst, src, size,
llvm.ConstInt(llvm.Int32Type(), 1, false), // single byte alignment
llvm.ConstInt(llvm.Int1Type(), 0, false), // not volatile
}
c.builder.CreateCall(memcpy, args, "")
c.builder.CreateRetVoid()
}
func addExterns(m *llgo.Module) {
CharPtr := llvm.PointerType(llvm.Int8Type(), 0)
fn_type := llvm.FunctionType(
llvm.Int32Type(), []llvm.Type{CharPtr}, false)
fflush := llvm.AddFunction(m.Module, "fflush", fn_type)
fflush.SetFunctionCallConv(llvm.CCallConv)
}
func (c *compiler) compareStrings(lhs, rhs *LLVMValue, op token.Token) *LLVMValue {
strcmp := c.module.Module.NamedFunction("runtime.strcmp")
if strcmp.IsNil() {
string_type := c.types.ToLLVM(types.String)
param_types := []llvm.Type{string_type, string_type}
func_type := llvm.FunctionType(llvm.Int32Type(), param_types, false)
strcmp = llvm.AddFunction(c.module.Module, "runtime.strcmp", func_type)
}
args := []llvm.Value{lhs.LLVMValue(), rhs.LLVMValue()}
result := c.builder.CreateCall(strcmp, args, "")
zero := llvm.ConstNull(llvm.Int32Type())
var pred llvm.IntPredicate
switch op {
case token.EQL:
pred = llvm.IntEQ
case token.LSS:
pred = llvm.IntSLT
case token.GTR:
pred = llvm.IntSGT
case token.LEQ:
pred = llvm.IntSLE
case token.GEQ:
pred = llvm.IntSGE
case token.NEQ:
panic("NEQ is handled in LLVMValue.BinaryOp")
default:
panic("unreachable")
}
result = c.builder.CreateICmp(pred, result, zero, "")
return c.NewLLVMValue(result, types.Bool)
}
// mapInsert inserts a key into a map, returning a pointer to the memory
// location for the value.
func (c *compiler) mapInsert(m *LLVMValue, key Value) *LLVMValue {
mapType := m.Type().(*types.Map)
mapinsert := c.module.Module.NamedFunction("runtime.mapinsert")
ptrType := c.target.IntPtrType()
if mapinsert.IsNil() {
// params: dynamic type, mapptr, keyptr
paramTypes := []llvm.Type{ptrType, ptrType, ptrType}
funcType := llvm.FunctionType(ptrType, paramTypes, false)
mapinsert = llvm.AddFunction(c.module.Module, "runtime.mapinsert", funcType)
}
args := make([]llvm.Value, 3)
args[0] = llvm.ConstPtrToInt(c.types.ToRuntime(m.Type()), ptrType)
args[1] = c.builder.CreatePtrToInt(m.pointer.LLVMValue(), ptrType, "")
if lv, islv := key.(*LLVMValue); islv && lv.pointer != nil {
args[2] = c.builder.CreatePtrToInt(lv.pointer.LLVMValue(), ptrType, "")
}
if args[2].IsNil() {
// Create global constant, so we can take its address.
global := llvm.AddGlobal(c.module.Module, c.types.ToLLVM(key.Type()), "")
global.SetGlobalConstant(true)
global.SetInitializer(key.LLVMValue())
args[2] = c.builder.CreatePtrToInt(global, ptrType, "")
}
eltPtrType := &types.Pointer{Base: mapType.Elt}
result := c.builder.CreateCall(mapinsert, args, "")
result = c.builder.CreateIntToPtr(result, c.types.ToLLVM(eltPtrType), "")
value := c.NewLLVMValue(result, eltPtrType)
return value.makePointee()
}
// interfacesEqual compares two interfaces for equality, returning
// a dynamic boolean value.
func (lhs *LLVMValue) compareI2I(rhs *LLVMValue) Value {
c := lhs.compiler
b := c.builder
lhsValue := b.CreateExtractValue(lhs.LLVMValue(), 0, "")
rhsValue := b.CreateExtractValue(rhs.LLVMValue(), 0, "")
lhsType := b.CreateExtractValue(lhs.LLVMValue(), 1, "")
rhsType := b.CreateExtractValue(rhs.LLVMValue(), 1, "")
llvmUintptr := c.target.IntPtrType()
runtimeCompareI2I := c.module.Module.NamedFunction("runtime.compareI2I")
if runtimeCompareI2I.IsNil() {
args := []llvm.Type{llvmUintptr, llvmUintptr, llvmUintptr, llvmUintptr}
functype := llvm.FunctionType(llvm.Int1Type(), args, false)
runtimeCompareI2I = llvm.AddFunction(
c.module.Module, "runtime.compareI2I", functype)
}
args := []llvm.Value{
c.builder.CreatePtrToInt(lhsType, llvmUintptr, ""),
c.builder.CreatePtrToInt(rhsType, llvmUintptr, ""),
c.builder.CreatePtrToInt(lhsValue, llvmUintptr, ""),
c.builder.CreatePtrToInt(rhsValue, llvmUintptr, ""),
}
result := c.builder.CreateCall(runtimeCompareI2I, args, "")
return c.NewLLVMValue(result, types.Bool)
}
// contextFunction creates a wrapper function that
// has the same signature as the specified function,
// but has an additional first parameter that accepts
// and ignores the function context value.
//
// contextFunction must be called with a global function
// pointer.
func contextFunction(c *compiler, f *LLVMValue) *LLVMValue {
defer c.builder.SetInsertPointAtEnd(c.builder.GetInsertBlock())
resultType := c.llvmtypes.ToLLVM(f.Type())
fnptr := f.LLVMValue()
contextType := resultType.StructElementTypes()[1]
llfntyp := fnptr.Type().ElementType()
llfntyp = llvm.FunctionType(
llfntyp.ReturnType(),
append([]llvm.Type{contextType}, llfntyp.ParamTypes()...),
llfntyp.IsFunctionVarArg(),
)
wrapper := llvm.AddFunction(c.module.Module, fnptr.Name()+".ctx", llfntyp)
wrapper.SetLinkage(llvm.PrivateLinkage)
entry := llvm.AddBasicBlock(wrapper, "entry")
c.builder.SetInsertPointAtEnd(entry)
args := make([]llvm.Value, len(llfntyp.ParamTypes())-1)
for i := range args {
args[i] = wrapper.Param(i + 1)
}
result := c.builder.CreateCall(fnptr, args, "")
switch nresults := f.Type().(*types.Signature).Results().Len(); nresults {
case 0:
c.builder.CreateRetVoid()
case 1:
c.builder.CreateRet(result)
default:
results := make([]llvm.Value, nresults)
for i := range results {
results[i] = c.builder.CreateExtractValue(result, i, "")
}
c.builder.CreateAggregateRet(results)
}
return c.NewValue(wrapper, f.Type())
}
func (c *compiler) VisitFuncProtoDecl(f *ast.FuncDecl) Value {
var fn_type *types.Func
fn_name := f.Name.String()
exported := ast.IsExported(fn_name)
if fn_name == "init" {
// Make "init" functions anonymous.
fn_name = ""
// "init" functions aren't recorded by the parser, so f.Name.Obj is
// not set.
fn_type = &types.Func{ /* no params or result */ }
} else {
fn_type = f.Name.Obj.Type.(*types.Func)
if c.module.Name == "main" && fn_name == "main" {
exported = true
} else {
pkgname := c.pkgmap[f.Name.Obj]
fn_name = pkgname + "." + fn_name
}
}
llvm_fn_type := c.types.ToLLVM(fn_type).ElementType()
fn := llvm.AddFunction(c.module.Module, fn_name, llvm_fn_type)
if exported {
fn.SetLinkage(llvm.ExternalLinkage)
}
result := c.NewLLVMValue(fn, fn_type)
if f.Name.Obj != nil {
f.Name.Obj.Data = result
f.Name.Obj.Type = fn_type
}
return result
}
func (c *compiler) VisitFuncLit(lit *ast.FuncLit) Value {
ftyp := c.types.expr[lit].(*types.Func)
fn_value := llvm.AddFunction(c.module.Module, "", c.types.ToLLVM(ftyp).ElementType())
fn_value.SetFunctionCallConv(llvm.FastCallConv)
defer c.builder.SetInsertPointAtEnd(c.builder.GetInsertBlock())
f := c.NewLLVMValue(fn_value, ftyp)
c.buildFunction(f, ftyp.Params, lit.Body)
return f
}
func getPrintf(module llvm.Module) llvm.Value {
printf := module.NamedFunction("printf")
if printf.IsNil() {
charPtr := llvm.PointerType(llvm.Int8Type(), 0)
ftyp := llvm.FunctionType(llvm.Int32Type(), []llvm.Type{charPtr}, true)
printf = llvm.AddFunction(module, "printf", ftyp)
printf.SetFunctionCallConv(llvm.CCallConv)
}
return printf
}
func getFflush(module llvm.Module) llvm.Value {
fflush := module.NamedFunction("fflush")
if fflush.IsNil() {
voidPtr := llvm.PointerType(llvm.Int8Type(), 0)
ftyp := llvm.FunctionType(llvm.Int32Type(), []llvm.Type{voidPtr}, false)
fflush = llvm.AddFunction(module, "fflush", ftyp)
fflush.SetFunctionCallConv(llvm.CCallConv)
}
return fflush
}
func (c *FunctionCache) NamedFunction(name string, signature string) llvm.Value {
f, _ := c.functions[name+":"+signature]
if !f.IsNil() {
return f
}
if strings.HasPrefix(name, c.module.Name+".") {
obj := c.pkg.Scope.Lookup(name[len(c.module.Name)+1:])
value := c.Resolve(obj)
f = value.LLVMValue()
} else {
fset := token.NewFileSet()
code := `package runtime;import("unsafe");` + signature + `{panic()}`
file, err := parser.ParseFile(fset, "", code, 0)
if err != nil {
panic(err)
}
// Parse the runtime package, since we may need to refer to
// its types. TODO cache the package.
buildpkg, err := build.Import("github.com/axw/llgo/pkg/runtime", "", 0)
if err != nil {
panic(err)
}
runtimefiles := make([]string, len(buildpkg.GoFiles))
for i, f := range buildpkg.GoFiles {
runtimefiles[i] = path.Join(buildpkg.Dir, f)
}
files, err := parseFiles(fset, runtimefiles)
if err != nil {
panic(err)
}
files["<src>"] = file
pkg, err := ast.NewPackage(fset, files, types.GcImport, types.Universe)
if err != nil {
panic(err)
}
_, err = types.Check(fset, pkg)
if err != nil {
panic(err)
}
fdecl := file.Decls[len(file.Decls)-1].(*ast.FuncDecl)
ftype := fdecl.Name.Obj.Type.(*types.Func)
llvmfptrtype := c.types.ToLLVM(ftype)
f = llvm.AddFunction(c.module.Module, name, llvmfptrtype.ElementType())
if !strings.HasPrefix(name, "llvm.") {
f.SetLinkage(llvm.AvailableExternallyLinkage)
}
}
c.functions[name+":"+signature] = f
return f
}
func (c *compiler) createMainFunction() error {
// In a PNaCl program (plugin), there should not be a "main.main";
// instead, we expect a "main.CreateModule" function.
// See pkg/nacl/ppapi/ppapi.go for more details.
mainMain := c.module.NamedFunction("main.main")
/*
if c.pnacl {
// PNaCl's libppapi_stub.a implements "main", which simply
// calls through to PpapiPluginMain. We define our own "main"
// so that we can capture argc/argv.
if !mainMain.IsNil() {
return fmt.Errorf("Found main.main")
}
pluginMain := c.RuntimeFunction("PpapiPluginMain", "func() int32")
// Synthesise a main which has no return value. We could cast
// PpapiPluginMain, but this is potentially unsafe as its
// calling convention is unspecified.
ftyp := llvm.FunctionType(llvm.VoidType(), nil, false)
mainMain = llvm.AddFunction(c.module.Module, "main.main", ftyp)
entry := llvm.AddBasicBlock(mainMain, "entry")
c.builder.SetInsertPointAtEnd(entry)
c.builder.CreateCall(pluginMain, nil, "")
c.builder.CreateRetVoid()
} else */{
mainMain = c.module.NamedFunction("main.main")
}
if mainMain.IsNil() {
return fmt.Errorf("Could not find main.main")
}
// runtime.main is called by main, with argc, argv, argp,
// and a pointer to main.main, which must be a niladic
// function with no result.
runtimeMain := c.runtime.main.LLVMValue()
ptrptr := llvm.PointerType(llvm.PointerType(llvm.Int8Type(), 0), 0)
ftyp := llvm.FunctionType(llvm.Int32Type(), []llvm.Type{llvm.Int32Type(), ptrptr, ptrptr}, true)
main := llvm.AddFunction(c.module.Module, "main", ftyp)
c.builder.SetCurrentDebugLocation(c.debug.MDNode(nil))
entry := llvm.AddBasicBlock(main, "entry")
c.builder.SetInsertPointAtEnd(entry)
runtimeMainParamTypes := runtimeMain.Type().ElementType().ParamTypes()
args := []llvm.Value{
main.Param(0), // argc
main.Param(1), // argv
main.Param(2), // argp
c.builder.CreateBitCast(mainMain, runtimeMainParamTypes[3], ""),
}
result := c.builder.CreateCall(runtimeMain, args, "")
c.builder.CreateRet(result)
return nil
}
func (c *compiler) makeFunc(ident *ast.Ident, ftyp *types.Signature) *LLVMValue {
fname := ident.String()
if ftyp.Recv() == nil && fname == "init" {
// Make "init" functions anonymous.
fname = ""
} else {
var pkgname string
if recv := ftyp.Recv(); recv != nil {
var recvname string
switch recvtyp := recv.Type().(type) {
case *types.Pointer:
if named, ok := recvtyp.Elem().(*types.Named); ok {
obj := named.Obj()
recvname = "*" + obj.Name()
pkgname = obj.Pkg().Path()
}
case *types.Named:
named := recvtyp
obj := named.Obj()
recvname = obj.Name()
pkgname = obj.Pkg().Path()
}
if recvname != "" {
fname = fmt.Sprintf("%s.%s", recvname, fname)
} else {
// If the receiver is an unnamed struct, we're
// synthesising a method for an unnamed struct
// type. There's no meaningful name to give the
// function, so leave it up to LLVM.
fname = ""
}
} else {
obj := c.typeinfo.Objects[ident]
pkgname = obj.Pkg().Path()
}
if fname != "" {
fname = pkgname + "." + fname
}
}
// gcimporter may produce multiple AST objects for the same function.
llvmftyp := c.types.ToLLVM(ftyp)
var fn llvm.Value
if fname != "" {
fn = c.module.Module.NamedFunction(fname)
}
if fn.IsNil() {
llvmfptrtyp := llvmftyp.StructElementTypes()[0].ElementType()
fn = llvm.AddFunction(c.module.Module, fname, llvmfptrtyp)
}
fn = llvm.ConstInsertValue(llvm.ConstNull(llvmftyp), fn, []uint32{0})
return c.NewValue(fn, ftyp)
}
func (c *compiler) concatenateStrings(lhs, rhs *LLVMValue) *LLVMValue {
strcat := c.module.Module.NamedFunction("runtime.strcat")
if strcat.IsNil() {
string_type := c.types.ToLLVM(types.String)
param_types := []llvm.Type{string_type, string_type}
func_type := llvm.FunctionType(string_type, param_types, false)
strcat = llvm.AddFunction(c.module.Module, "runtime.strcat", func_type)
}
args := []llvm.Value{lhs.LLVMValue(), rhs.LLVMValue()}
result := c.builder.CreateCall(strcat, args, "")
return c.NewLLVMValue(result, types.String)
}
func (c *FunctionCache) NamedFunction(name string, signature string) llvm.Value {
f, _ := c.functions[name+":"+signature]
if !f.IsNil() {
return f
}
if strings.HasPrefix(name, c.module.Name+".") {
obj := c.pkg.Scope.Lookup(name[len(c.module.Name)+1:])
value := c.Resolve(obj)
f = value.LLVMValue()
} else {
fset := token.NewFileSet()
code := `package runtime;import("unsafe");` + signature + `{panic()}`
file, err := parser.ParseFile(fset, "", code, 0)
if err != nil {
panic(err)
}
// Parse the runtime package, since we may need to refer to
// its types. Can't be cached, because type-checking can't
// be done twice on the AST.
buildpkg, err := build.Import("github.com/axw/llgo/pkg/runtime", "", 0)
if err != nil {
panic(err)
}
// All types visible to the compiler are in "types.go".
runtimefiles := []string{path.Join(buildpkg.Dir, "types.go")}
files, err := parseFiles(fset, runtimefiles)
if err != nil {
panic(err)
}
files["<src>"] = file
pkg, err := ast.NewPackage(fset, files, types.GcImport, types.Universe)
if err != nil {
panic(err)
}
_, err = types.Check("", c.compiler, fset, pkg)
if err != nil {
panic(err)
}
fdecl := file.Decls[len(file.Decls)-1].(*ast.FuncDecl)
ftype := fdecl.Name.Obj.Type.(*types.Func)
llvmfptrtype := c.types.ToLLVM(ftype)
f = llvm.AddFunction(c.module.Module, name, llvmfptrtype.ElementType())
}
c.functions[name+":"+signature] = f
return f
}
func getnewgoroutine(module llvm.Module) llvm.Value {
fn := module.NamedFunction("llgo_newgoroutine")
if fn.IsNil() {
i8Ptr := llvm.PointerType(llvm.Int8Type(), 0)
VoidFnPtr := llvm.PointerType(llvm.FunctionType(
llvm.VoidType(), []llvm.Type{i8Ptr}, false), 0)
i32 := llvm.Int32Type()
fn_type := llvm.FunctionType(
llvm.VoidType(), []llvm.Type{VoidFnPtr, i8Ptr, i32}, true)
fn = llvm.AddFunction(module, "llgo_newgoroutine", fn_type)
fn.SetFunctionCallConv(llvm.CCallConv)
}
return fn
}
func (c *FunctionCache) NamedFunction(name string, signature string) llvm.Value {
f, _ := c.functions[name+":"+signature]
if !f.IsNil() {
return f
}
if strings.HasPrefix(name, c.module.Name+".") {
obj := c.pkg.Scope().Lookup(name[len(c.module.Name)+1:])
if obj == nil {
panic("Missing function: " + name)
}
value := c.Resolve(c.objectdata[obj].Ident)
f = llvm.ConstExtractValue(value.LLVMValue(), []uint32{0})
} else {
fset := token.NewFileSet()
code := `package runtime;import("unsafe");` + signature + `{panic("")}`
file, err := parser.ParseFile(fset, "", code, 0)
if err != nil {
panic(err)
}
// Parse the runtime package, since we may need to refer to
// its types. Can't be cached, because type-checking can't
// be done twice on the AST.
buildpkg, err := build.Import("github.com/axw/llgo/pkg/runtime", "", 0)
if err != nil {
panic(err)
}
// All types visible to the compiler are in "types.go".
runtimefiles := []string{path.Join(buildpkg.Dir, "types.go")}
files, err := parseFiles(fset, runtimefiles)
if err != nil {
panic(err)
}
files = append(files, file)
_, _, err = c.typecheck("runtime", fset, files)
if err != nil {
panic(err)
}
fdecl := file.Decls[len(file.Decls)-1].(*ast.FuncDecl)
ftype := c.objects[fdecl.Name].Type().(*types.Signature)
llvmfntyp := c.types.ToLLVM(ftype).StructElementTypes()[0].ElementType()
f = llvm.AddFunction(c.module.Module, name, llvmfntyp)
}
c.functions[name+":"+signature] = f
return f
}
func (c *compiler) VisitFuncProtoDecl(f *ast.FuncDecl) *LLVMValue {
if f.Name.Obj != nil {
if result, ok := f.Name.Obj.Data.(*LLVMValue); ok {
return result
}
}
var fn_type *types.Func
fn_name := f.Name.String()
if f.Recv == nil && fn_name == "init" {
// Make "init" functions anonymous.
fn_name = ""
// "init" functions aren't recorded by the parser, so f.Name.Obj is
// not set.
fn_type = &types.Func{ /* no params or result */ }
} else {
fn_type = f.Name.Obj.Type.(*types.Func)
if c.module.Name != "main" || fn_name != "main" {
if fn_type.Recv != nil {
recv := fn_type.Recv
if recvtyp, ok := recv.Type.(*types.Pointer); ok {
recv = recvtyp.Base.(*types.Name).Obj
} else {
recv = recv.Type.(*types.Name).Obj
}
pkgname := c.pkgmap[recv]
fn_name = pkgname + "." + recv.Name + "." + fn_name
} else {
pkgname := c.pkgmap[f.Name.Obj]
fn_name = pkgname + "." + fn_name
}
}
}
llvm_fn_type := c.types.ToLLVM(fn_type).ElementType()
// gcimporter may produce multiple AST objects for the same function.
fn := c.module.Module.NamedFunction(fn_name)
if fn.IsNil() {
fn = llvm.AddFunction(c.module.Module, fn_name, llvm_fn_type)
}
result := c.NewLLVMValue(fn, fn_type)
if f.Name.Obj != nil {
f.Name.Obj.Data = result
f.Name.Obj.Type = fn_type
}
return result
}
func (c *FunctionCache) NamedFunction(name string, signature string) llvm.Value {
f, _ := c.functions[name+":"+signature]
if !f.IsNil() {
return f
}
if strings.HasPrefix(name, c.module.Name+".") {
obj := c.pkg.Scope().Lookup(name[len(c.module.Name)+1:])
if obj == nil {
panic("Missing function: " + name)
}
value := c.Resolve(c.objectdata[obj].Ident)
f = llvm.ConstExtractValue(value.LLVMValue(), []uint32{0})
} else {
if c.runtimetypespkg == nil {
// Parse the runtime package, since we may need to refer to
// its types.
buildpkg, err := build.Import("github.com/axw/llgo/pkg/runtime", "", 0)
if err != nil {
panic(err)
}
// All types visible to the compiler are in "types.go".
runtimefiles := []string{path.Join(buildpkg.Dir, "types.go")}
fset := token.NewFileSet()
files, err := parseFiles(fset, runtimefiles)
if err != nil {
panic(err)
}
c.runtimetypespkg, err = c.typecheck("runtime", fset, files)
if err != nil {
panic(err)
}
}
pkg := c.runtimetypespkg
scope := pkg.Scope().Child(0)
ftype, _, err := types.Eval(signature+"{panic()}", pkg, scope)
if err != nil {
panic(err)
}
llvmfntyp := c.types.ToLLVM(ftype).StructElementTypes()[0].ElementType()
f = llvm.AddFunction(c.module.Module, name, llvmfntyp)
}
c.functions[name+":"+signature] = f
return f
}
func (tm *TypeMap) makeAlgorithmTable(t types.Type) llvm.Value {
// TODO set these to actual functions.
hashAlg := llvm.ConstNull(llvm.PointerType(tm.hashAlgFunctionType, 0))
printAlg := llvm.ConstNull(llvm.PointerType(tm.printAlgFunctionType, 0))
copyAlg := llvm.ConstNull(llvm.PointerType(tm.copyAlgFunctionType, 0))
equalAlgName := "runtime.memequal"
equalAlg := tm.module.NamedFunction(equalAlgName)
if equalAlg.IsNil() {
equalAlg = llvm.AddFunction(
tm.module, equalAlgName, tm.equalAlgFunctionType)
}
elems := []llvm.Value{hashAlg, equalAlg, printAlg, copyAlg}
return llvm.ConstStruct(elems, false)
}
func (c *compiler) VisitAppend(expr *ast.CallExpr) Value {
// TODO handle ellpisis arg
s := c.VisitExpr(expr.Args[0])
elem := c.VisitExpr(expr.Args[1])
appendName := "runtime.sliceappend"
appendFun := c.module.NamedFunction(appendName)
uintptrTyp := c.target.IntPtrType()
var i8slice llvm.Type
if appendFun.IsNil() {
i8slice = c.types.ToLLVM(&types.Slice{Elt: types.Int8})
args := []llvm.Type{uintptrTyp, i8slice, i8slice}
appendFunTyp := llvm.FunctionType(i8slice, args, false)
appendFun = llvm.AddFunction(c.module.Module, appendName, appendFunTyp)
} else {
i8slice = appendFun.Type().ReturnType()
}
i8ptr := i8slice.StructElementTypes()[0]
// Coerce first argument into an []int8.
a_ := s.LLVMValue()
sliceTyp := a_.Type()
a := c.coerceSlice(a_, i8slice)
// Construct a fresh []int8 for the temporary slice.
b_ := elem.LLVMValue()
one := llvm.ConstInt(llvm.Int32Type(), 1, false)
mem := c.builder.CreateAlloca(elem.LLVMValue().Type(), "")
c.builder.CreateStore(b_, mem)
b := llvm.Undef(i8slice)
b = c.builder.CreateInsertValue(b, c.builder.CreateBitCast(mem, i8ptr, ""), 0, "")
b = c.builder.CreateInsertValue(b, one, 1, "")
b = c.builder.CreateInsertValue(b, one, 2, "")
// Call runtime function, then coerce the result.
runtimeTyp := c.types.ToRuntime(s.Type())
runtimeTyp = c.builder.CreatePtrToInt(runtimeTyp, uintptrTyp, "")
args := []llvm.Value{runtimeTyp, a, b}
result := c.builder.CreateCall(appendFun, args, "")
return c.NewLLVMValue(c.coerceSlice(result, sliceTyp), s.Type())
}
func (u *unit) resolveFunction(f *ssa.Function) *LLVMValue {
if v, ok := u.globals[f]; ok {
return v
}
name := f.String()
if f.Enclosing != nil {
// Anonymous functions are not guaranteed to
// have unique identifiers at the global scope.
name = f.Enclosing.String() + ":" + name
}
// It's possible that the function already exists in the module;
// for example, if it's a runtime intrinsic that the compiler
// has already referenced.
llvmFunction := u.module.Module.NamedFunction(name)
if llvmFunction.IsNil() {
llvmType := u.llvmtypes.ToLLVM(f.Signature)
llvmType = llvmType.StructElementTypes()[0].ElementType()
if len(f.FreeVars) > 0 {
// Add an implicit first argument.
returnType := llvmType.ReturnType()
paramTypes := llvmType.ParamTypes()
vararg := llvmType.IsFunctionVarArg()
blockElementTypes := make([]llvm.Type, len(f.FreeVars))
for i, fv := range f.FreeVars {
blockElementTypes[i] = u.llvmtypes.ToLLVM(fv.Type())
}
blockType := llvm.StructType(blockElementTypes, false)
blockPtrType := llvm.PointerType(blockType, 0)
paramTypes = append([]llvm.Type{blockPtrType}, paramTypes...)
llvmType = llvm.FunctionType(returnType, paramTypes, vararg)
}
llvmFunction = llvm.AddFunction(u.module.Module, name, llvmType)
if f.Enclosing != nil {
llvmFunction.SetLinkage(llvm.PrivateLinkage)
}
u.undefinedFuncs[f] = true
}
v := u.NewValue(llvmFunction, f.Signature)
u.globals[f] = v
return v
}
func (tm *TypeMap) interfaceFuncWrapper(f llvm.Value) llvm.Value {
ftyp := f.Type().ElementType()
paramTypes := ftyp.ParamTypes()
recvType := paramTypes[0]
paramTypes[0] = llvm.PointerType(llvm.Int8Type(), 0)
newf := llvm.AddFunction(f.GlobalParent(), f.Name()+".ifn", llvm.FunctionType(
ftyp.ReturnType(),
paramTypes,
ftyp.IsFunctionVarArg(),
))
b := llvm.GlobalContext().NewBuilder()
defer b.Dispose()
entry := llvm.AddBasicBlock(newf, "entry")
b.SetInsertPointAtEnd(entry)
args := make([]llvm.Value, len(paramTypes))
for i := range paramTypes {
args[i] = newf.Param(i)
}
recvBits := int(tm.target.TypeSizeInBits(recvType))
if recvBits > 0 {
args[0] = b.CreatePtrToInt(args[0], tm.target.IntPtrType(), "")
if args[0].Type().IntTypeWidth() > recvBits {
args[0] = b.CreateTrunc(args[0], llvm.IntType(recvBits), "")
}
args[0] = coerce(b, args[0], recvType)
} else {
args[0] = llvm.ConstNull(recvType)
}
result := b.CreateCall(f, args, "")
if result.Type().TypeKind() == llvm.VoidTypeKind {
b.CreateRetVoid()
} else {
b.CreateRet(result)
}
return newf
}
func (c *compiler) VisitFuncLit(lit *ast.FuncLit) Value {
fn_type := c.VisitFuncType(lit.Type)
fn := llvm.AddFunction(c.module.Module, "", c.types.ToLLVM(fn_type))
fn.SetFunctionCallConv(llvm.FastCallConv)
defer c.builder.SetInsertPointAtEnd(c.builder.GetInsertBlock())
entry := llvm.AddBasicBlock(fn, "entry")
c.builder.SetInsertPointAtEnd(entry)
fn_value := c.NewLLVMValue(fn, fn_type)
c.functions = append(c.functions, fn_value)
c.VisitBlockStmt(lit.Body)
if fn_type.Results == nil {
lasti := entry.LastInstruction()
if lasti.IsNil() || lasti.Opcode() != llvm.Ret {
// Assume nil return type, AST should be checked first.
c.builder.CreateRetVoid()
}
}
c.functions = c.functions[0 : len(c.functions)-1]
return fn_value
}
func (c *compiler) createMainFunction() error {
// In a PNaCl program (plugin), there should not be a "main.main";
// instead, we expect a "main.CreateModule" function.
// See pkg/nacl/ppapi/ppapi.go for more details.
mainMain := c.module.NamedFunction("main.main")
if c.pnacl {
// PNaCl's libppapi_stub.a implements "main", which simply
// calls through to PpapiPluginMain. We define our own "main"
// so that we can capture argc/argv.
if !mainMain.IsNil() {
return fmt.Errorf("Found main.main")
}
pluginMain := c.NamedFunction("PpapiPluginMain", "func f() int32")
// Synthesise a main which has no return value. We could cast
// PpapiPluginMain, but this is potentially unsafe as its
// calling convention is unspecified.
ftyp := llvm.FunctionType(llvm.VoidType(), nil, false)
mainMain = llvm.AddFunction(c.module.Module, "main.main", ftyp)
entry := llvm.AddBasicBlock(mainMain, "entry")
c.builder.SetInsertPointAtEnd(entry)
c.builder.CreateCall(pluginMain, nil, "")
c.builder.CreateRetVoid()
} else {
mainMain = c.module.NamedFunction("main.main")
}
// runtime.main is called by main, with argc, argv,
// and a pointer to main.main.
runtimeMain := c.NamedFunction("runtime.main", "func f(int32, **byte, **byte, func()) int32")
main := c.NamedFunction("main", "func f(int32, **byte, **byte) int32")
entry := llvm.AddBasicBlock(main, "entry")
c.builder.SetInsertPointAtEnd(entry)
args := []llvm.Value{main.Param(0), main.Param(1), main.Param(2), mainMain}
result := c.builder.CreateCall(runtimeMain, args, "")
c.builder.CreateRet(result)
return nil
}
// Create a constructor function which initialises a global.
// TODO collapse all global inits into one init function?
func (c *compiler) createGlobal(e ast.Expr, t types.Type, name string, export bool) (g *LLVMValue) {
if e == nil {
gv := llvm.AddGlobal(c.module.Module, c.types.ToLLVM(t), name)
if !export {
gv.SetLinkage(llvm.InternalLinkage)
}
g = c.NewLLVMValue(gv, &types.Pointer{Base: t})
if !isArray(t) {
return g.makePointee()
}
return g
}
if block := c.builder.GetInsertBlock(); !block.IsNil() {
defer c.builder.SetInsertPointAtEnd(block)
}
fn_type := new(types.Func)
llvm_fn_type := c.types.ToLLVM(fn_type).ElementType()
fn := llvm.AddFunction(c.module.Module, "", llvm_fn_type)
fn.SetLinkage(llvm.InternalLinkage)
entry := llvm.AddBasicBlock(fn, "entry")
c.builder.SetInsertPointAtEnd(entry)
// Visit the expression. Dereference if necessary, and generalise
// the type if one hasn't been specified.
init_ := c.VisitExpr(e)
_, isconst := init_.(ConstValue)
if t == nil {
t = init_.Type()
} else {
init_ = init_.Convert(t)
}
// If the result is a constant, discard the function before
// creating any llvm.Value's.
if isconst {
fn.EraseFromParentAsFunction()
fn = llvm.Value{nil}
}
// Set the initialiser. If it's a non-const value, then
// we'll have to do the assignment in a global constructor
// function.
gv := llvm.AddGlobal(c.module.Module, c.types.ToLLVM(t), name)
if !export {
gv.SetLinkage(llvm.InternalLinkage)
}
g = c.NewLLVMValue(gv, &types.Pointer{Base: t})
if !isArray(t) {
g = g.makePointee()
}
if isconst {
// Initialiser is constant; discard function and return global now.
gv.SetInitializer(init_.LLVMValue())
} else {
gv.SetInitializer(llvm.ConstNull(c.types.ToLLVM(t)))
c.builder.CreateStore(init_.LLVMValue(), gv)
}
if !fn.IsNil() {
c.builder.CreateRetVoid()
// FIXME order global ctors
fn_value := c.NewLLVMValue(fn, fn_type)
c.initfuncs = append(c.initfuncs, fn_value)
}
return g
}
// prepareCall returns the evaluated function and arguments.
//
// For builtins that may not be used in go/defer, prepareCall
// will emits inline code. In this case, prepareCall returns
// nil for fn and args, and returns a non-nil value for result.
func (fr *frame) prepareCall(instr ssa.CallInstruction) (fn *LLVMValue, args []*LLVMValue, result *LLVMValue) {
call := instr.Common()
args = make([]*LLVMValue, len(call.Args))
for i, arg := range call.Args {
args[i] = fr.value(arg)
}
if call.IsInvoke() {
fn := fr.interfaceMethod(fr.value(call.Value), call.Method)
return fn, args, nil
}
switch v := call.Value.(type) {
case *ssa.Builtin:
// handled below
case *ssa.Function:
// Function handled specially; value() will convert
// a function to one with a context argument.
fn = fr.resolveFunction(v)
pair := llvm.ConstNull(fr.llvmtypes.ToLLVM(fn.Type()))
pair = llvm.ConstInsertValue(pair, fn.LLVMValue(), []uint32{0})
fn = fr.NewValue(pair, fn.Type())
return fn, args, nil
default:
fn = fr.value(call.Value)
return fn, args, nil
}
// Builtins may only be used in calls (i.e. can't be assigned),
// and only print[ln], panic and recover may be used in go/defer.
builtin := call.Value.(*ssa.Builtin)
switch builtin.Name() {
case "print", "println":
// print/println generates a call-site specific anonymous
// function to print the values. It's not inline because
// print/println may be deferred.
params := make([]*types.Var, len(call.Args))
for i, arg := range call.Args {
// make sure to use args[i].Type(), not call.Args[i].Type(),
// as the evaluated expression converts untyped.
params[i] = types.NewParam(arg.Pos(), nil, arg.Name(), args[i].Type())
}
sig := types.NewSignature(nil, nil, types.NewTuple(params...), nil, false)
llfntyp := fr.llvmtypes.ToLLVM(sig)
llfnptr := llvm.AddFunction(fr.module.Module, "", llfntyp.StructElementTypes()[0].ElementType())
currBlock := fr.builder.GetInsertBlock()
entry := llvm.AddBasicBlock(llfnptr, "entry")
fr.builder.SetInsertPointAtEnd(entry)
internalArgs := make([]Value, len(args))
for i, arg := range args {
internalArgs[i] = fr.NewValue(llfnptr.Param(i), arg.Type())
}
fr.printValues(builtin.Name() == "println", internalArgs...)
fr.builder.CreateRetVoid()
fr.builder.SetInsertPointAtEnd(currBlock)
return fr.NewValue(llfnptr, sig), args, nil
case "panic":
panic("TODO: panic")
case "recover":
// TODO(axw) determine number of frames to skip in pc check
indirect := fr.NewValue(llvm.ConstNull(llvm.Int32Type()), types.Typ[types.Int32])
return fr.runtime.recover_, []*LLVMValue{indirect}, nil
case "append":
return nil, nil, fr.callAppend(args[0], args[1])
case "close":
return fr.runtime.chanclose, args, nil
case "cap":
return nil, nil, fr.callCap(args[0])
case "len":
return nil, nil, fr.callLen(args[0])
case "copy":
return nil, nil, fr.callCopy(args[0], args[1])
case "delete":
fr.callDelete(args[0], args[1])
return nil, nil, nil
case "real":
return nil, nil, args[0].extractComplexComponent(0)
case "imag":
return nil, nil, args[0].extractComplexComponent(1)
case "complex":
r := args[0].LLVMValue()
i := args[1].LLVMValue()
typ := instr.Value().Type()
cmplx := llvm.Undef(fr.llvmtypes.ToLLVM(typ))
cmplx = fr.builder.CreateInsertValue(cmplx, r, 0, "")
cmplx = fr.builder.CreateInsertValue(cmplx, i, 1, "")
return nil, nil, fr.NewValue(cmplx, typ)
default:
panic("unimplemented: " + builtin.Name())
}
}
// indirectFunction creates an indirect function from a
// given function, suitable for use with "defer" and "go".
func (c *compiler) indirectFunction(fn *LLVMValue, args []Value, dotdotdot bool) *LLVMValue {
nilarytyp := &types.Signature{}
if len(args) == 0 {
val := fn.LLVMValue()
ptr := c.builder.CreateExtractValue(val, 0, "")
ctx := c.builder.CreateExtractValue(val, 1, "")
fnval := llvm.Undef(c.types.ToLLVM(nilarytyp))
ptr = c.builder.CreateBitCast(ptr, fnval.Type().StructElementTypes()[0], "")
ctx = c.builder.CreateBitCast(ctx, fnval.Type().StructElementTypes()[1], "")
fnval = c.builder.CreateInsertValue(fnval, ptr, 0, "")
fnval = c.builder.CreateInsertValue(fnval, ctx, 1, "")
fn = c.NewValue(fnval, nilarytyp)
return fn
}
// TODO check if function pointer is global. I suppose
// the same can be done with the context ptr...
fnval := fn.LLVMValue()
fnptr := c.builder.CreateExtractValue(fnval, 0, "")
ctx := c.builder.CreateExtractValue(fnval, 1, "")
nctx := 1 // fnptr
if !ctx.IsNull() {
nctx++ // fnctx
}
i8ptr := llvm.PointerType(llvm.Int8Type(), 0)
llvmargs := make([]llvm.Value, len(args)+nctx)
llvmargtypes := make([]llvm.Type, len(args)+nctx)
for i, arg := range args {
llvmargs[i+nctx] = arg.LLVMValue()
llvmargtypes[i+nctx] = llvmargs[i+nctx].Type()
}
llvmargtypes[0] = fnptr.Type()
llvmargs[0] = fnptr
if nctx > 1 {
llvmargtypes[1] = ctx.Type()
llvmargs[1] = ctx
}
structtyp := llvm.StructType(llvmargtypes, false)
argstruct := c.createTypeMalloc(structtyp)
for i, llvmarg := range llvmargs {
argptr := c.builder.CreateGEP(argstruct, []llvm.Value{
llvm.ConstInt(llvm.Int32Type(), 0, false),
llvm.ConstInt(llvm.Int32Type(), uint64(i), false)}, "")
c.builder.CreateStore(llvmarg, argptr)
}
// Create a function that will take a pointer to a structure of the type
// defined above, or no parameters if there are none to pass.
fntype := llvm.FunctionType(llvm.VoidType(), []llvm.Type{argstruct.Type()}, false)
indirectfn := llvm.AddFunction(c.module.Module, "", fntype)
i8argstruct := c.builder.CreateBitCast(argstruct, i8ptr, "")
currblock := c.builder.GetInsertBlock()
c.builder.SetInsertPointAtEnd(llvm.AddBasicBlock(indirectfn, "entry"))
argstruct = indirectfn.Param(0)
for i := range llvmargs[nctx:] {
argptr := c.builder.CreateGEP(argstruct, []llvm.Value{
llvm.ConstInt(llvm.Int32Type(), 0, false),
llvm.ConstInt(llvm.Int32Type(), uint64(i+nctx), false)}, "")
ptrtyp := types.NewPointer(args[i].Type())
args[i] = c.NewValue(argptr, ptrtyp).makePointee()
}
// Extract the function pointer.
// TODO if function is a global, elide.
fnval = llvm.Undef(fnval.Type())
fnptrptr := c.builder.CreateGEP(argstruct, []llvm.Value{
llvm.ConstInt(llvm.Int32Type(), 0, false),
llvm.ConstInt(llvm.Int32Type(), 0, false)}, "")
fnptr = c.builder.CreateLoad(fnptrptr, "")
fnval = c.builder.CreateInsertValue(fnval, fnptr, 0, "")
if nctx > 1 {
ctxptr := c.builder.CreateGEP(argstruct, []llvm.Value{
llvm.ConstInt(llvm.Int32Type(), 0, false),
llvm.ConstInt(llvm.Int32Type(), 1, false)}, "")
ctx = c.builder.CreateLoad(ctxptr, "")
fnval = c.builder.CreateInsertValue(fnval, ctx, 1, "")
fn = c.NewValue(fnval, fn.Type())
}
c.createCall(fn, args, dotdotdot, false)
// Indirect function calls' return values are always ignored.
c.builder.CreateRetVoid()
c.builder.SetInsertPointAtEnd(currblock)
fnval = llvm.Undef(c.types.ToLLVM(nilarytyp))
indirectfn = c.builder.CreateBitCast(indirectfn, fnval.Type().StructElementTypes()[0], "")
fnval = c.builder.CreateInsertValue(fnval, indirectfn, 0, "")
fnval = c.builder.CreateInsertValue(fnval, i8argstruct, 1, "")
fn = c.NewValue(fnval, nilarytyp)
return fn
}
func (c *compiler) VisitGoStmt(stmt *ast.GoStmt) {
//stmt.Call *ast.CallExpr
// TODO
var fn *LLVMValue
switch x := (stmt.Call.Fun).(type) {
case *ast.Ident:
fn = c.Resolve(x.Obj).(*LLVMValue)
if fn == nil {
panic(fmt.Sprintf(
"No function found with name '%s'", x.String()))
}
default:
fn = c.VisitExpr(stmt.Call.Fun).(*LLVMValue)
}
// Evaluate arguments, store in a structure on the stack.
var args_struct_type llvm.Type
var args_mem llvm.Value
var args_size llvm.Value
if stmt.Call.Args != nil {
param_types := make([]llvm.Type, 0)
fn_type := types.Deref(fn.Type()).(*types.Func)
for _, param := range fn_type.Params {
typ := param.Type.(types.Type)
param_types = append(param_types, c.types.ToLLVM(typ))
}
args_struct_type = llvm.StructType(param_types, false)
args_mem = c.builder.CreateAlloca(args_struct_type, "")
for i, expr := range stmt.Call.Args {
value_i := c.VisitExpr(expr)
value_i = value_i.Convert(fn_type.Params[i].Type.(types.Type))
arg_i := c.builder.CreateGEP(args_mem, []llvm.Value{
llvm.ConstInt(llvm.Int32Type(), 0, false),
llvm.ConstInt(llvm.Int32Type(), uint64(i), false)}, "")
c.builder.CreateStore(value_i.LLVMValue(), arg_i)
}
args_size = llvm.SizeOf(args_struct_type)
args_size = llvm.ConstTrunc(args_size, llvm.Int32Type())
} else {
args_struct_type = llvm.VoidType()
args_mem = llvm.ConstNull(llvm.PointerType(args_struct_type, 0))
args_size = llvm.ConstInt(llvm.Int32Type(), 0, false)
}
// When done, return to where we were.
defer c.builder.SetInsertPointAtEnd(c.builder.GetInsertBlock())
// Create a function that will take a pointer to a structure of the type
// defined above, or no parameters if there are none to pass.
indirect_fn_type := llvm.FunctionType(
llvm.VoidType(),
[]llvm.Type{llvm.PointerType(args_struct_type, 0)}, false)
indirect_fn := llvm.AddFunction(c.module.Module, "", indirect_fn_type)
indirect_fn.SetFunctionCallConv(llvm.CCallConv)
// Call "newgoroutine" with the indirect function and stored args.
newgoroutine := getnewgoroutine(c.module.Module)
ngr_param_types := newgoroutine.Type().ElementType().ParamTypes()
fn_arg := c.builder.CreateBitCast(indirect_fn, ngr_param_types[0], "")
args_arg := c.builder.CreateBitCast(args_mem,
llvm.PointerType(llvm.Int8Type(), 0), "")
c.builder.CreateCall(newgoroutine,
[]llvm.Value{fn_arg, args_arg, args_size}, "")
entry := llvm.AddBasicBlock(indirect_fn, "entry")
c.builder.SetInsertPointAtEnd(entry)
var args []llvm.Value
if stmt.Call.Args != nil {
args_mem = indirect_fn.Param(0)
args = make([]llvm.Value, len(stmt.Call.Args))
for i := range stmt.Call.Args {
arg_i := c.builder.CreateGEP(args_mem, []llvm.Value{
llvm.ConstInt(llvm.Int32Type(), 0, false),
llvm.ConstInt(llvm.Int32Type(), uint64(i), false)}, "")
args[i] = c.builder.CreateLoad(arg_i, "")
}
}
c.builder.CreateCall(fn.LLVMValue(), args, "")
c.builder.CreateRetVoid()
}