// interfaceMethod returns a function pointer for the specified
// interface and method pair.
func (c *compiler) interfaceMethod(iface *LLVMValue, method *types.Func) *LLVMValue {
lliface := iface.LLVMValue()
llitab := c.builder.CreateExtractValue(lliface, 0, "")
llvalue := c.builder.CreateExtractValue(lliface, 1, "")
sig := method.Type().(*types.Signature)
methodset := c.types.MethodSet(sig.Recv().Type())
// TODO(axw) cache ordered method index
var index int
for i := 0; i < methodset.Len(); i++ {
if methodset.At(i).Obj() == method {
index = i
break
}
}
llitab = c.builder.CreateBitCast(llitab, llvm.PointerType(c.runtime.itab.llvm, 0), "")
llifn := c.builder.CreateGEP(llitab, []llvm.Value{
llvm.ConstInt(llvm.Int32Type(), 0, false),
llvm.ConstInt(llvm.Int32Type(), 5, false), // index of itab.fun
}, "")
_ = index
llifn = c.builder.CreateGEP(llifn, []llvm.Value{
llvm.ConstInt(llvm.Int32Type(), uint64(index), false),
}, "")
llifn = c.builder.CreateLoad(llifn, "")
// Strip receiver.
sig = types.NewSignature(nil, nil, sig.Params(), sig.Results(), sig.Variadic())
llfn := llvm.Undef(c.types.ToLLVM(sig))
llifn = c.builder.CreateIntToPtr(llifn, llfn.Type().StructElementTypes()[0], "")
llfn = c.builder.CreateInsertValue(llfn, llifn, 0, "")
llfn = c.builder.CreateInsertValue(llfn, llvalue, 1, "")
return c.NewValue(llfn, sig)
}
func (d *debugInfo) setLocation(b llvm.Builder, pos token.Pos) {
position := d.Fset.Position(pos)
b.SetCurrentDebugLocation(llvm.MDNode([]llvm.Value{
llvm.ConstInt(llvm.Int32Type(), uint64(position.Line), true),
llvm.ConstInt(llvm.Int32Type(), uint64(position.Column), true),
d.MDNode(d.context()),
llvm.Value{},
}))
}
func (d *BlockDescriptor) mdNode(info *DebugInfo) llvm.Value {
return llvm.MDNode([]llvm.Value{
llvm.ConstInt(llvm.Int32Type(), uint64(d.Tag())+llvm.LLVMDebugVersion, false),
info.mdFileNode(d.File),
info.MDNode(d.Context),
llvm.ConstInt(llvm.Int32Type(), uint64(d.Line), false),
llvm.ConstInt(llvm.Int32Type(), uint64(d.Column), false),
llvm.ConstInt(llvm.Int32Type(), uint64(d.Id), false),
})
}
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 (d *LocalVariableDescriptor) mdNode(info *DebugInfo) llvm.Value {
return llvm.MDNode([]llvm.Value{
llvm.ConstInt(llvm.Int32Type(), uint64(d.Tag())+llvm.LLVMDebugVersion, false),
info.MDNode(d.Context),
llvm.MDString(d.Name),
info.mdFileNode(d.File),
llvm.ConstInt(llvm.Int32Type(), uint64(d.Line)|(uint64(d.Argument)<<24), false),
info.MDNode(d.Type),
llvm.ConstNull(llvm.Int32Type()), // flags
llvm.ConstNull(llvm.Int32Type()), // optional reference to inline location
})
}
func (d *DerivedTypeDescriptor) mdNode(info *DebugInfo) llvm.Value {
return llvm.MDNode([]llvm.Value{
llvm.ConstInt(llvm.Int32Type(), llvm.LLVMDebugVersion+uint64(d.Tag()), false),
FileDescriptor(d.File).path(),
info.MDNode(d.Context),
llvm.MDString(d.Name),
llvm.ConstInt(llvm.Int32Type(), uint64(d.Line), false),
llvm.ConstInt(llvm.Int64Type(), d.Size, false),
llvm.ConstInt(llvm.Int64Type(), d.Alignment, false),
llvm.ConstInt(llvm.Int64Type(), d.Offset, false),
llvm.ConstInt(llvm.Int32Type(), uint64(d.Flags), false),
info.MDNode(d.Base)})
}
func (d *GlobalVariableDescriptor) mdNode(info *DebugInfo) llvm.Value {
return llvm.MDNode([]llvm.Value{
llvm.ConstInt(llvm.Int32Type(), uint64(d.Tag())+llvm.LLVMDebugVersion, false),
llvm.ConstNull(llvm.Int32Type()),
info.MDNode(d.Context),
llvm.MDString(d.Name),
llvm.MDString(d.DisplayName),
llvm.MDNode(nil),
info.mdFileNode(d.File),
llvm.ConstInt(llvm.Int32Type(), uint64(d.Line), false),
info.MDNode(d.Type),
constInt1(d.Local),
constInt1(!d.External),
d.Value})
}
func (d subrangeDescriptor) mdNode(info *DebugInfo) llvm.Value {
return llvm.MDNode([]llvm.Value{
llvm.ConstInt(llvm.Int32Type(), uint64(d.Tag())+llvm.LLVMDebugVersion, false),
llvm.ConstInt(llvm.Int64Type(), uint64(d.low), true),
llvm.ConstInt(llvm.Int64Type(), uint64(d.high), true),
})
}
func (tm *llvmTypeMap) basicLLVMType(b *types.Basic) llvm.Type {
switch b.Kind() {
case types.Bool:
return llvm.Int1Type()
case types.Int8, types.Uint8:
return llvm.Int8Type()
case types.Int16, types.Uint16:
return llvm.Int16Type()
case types.Int32, types.Uint32:
return llvm.Int32Type()
case types.Uint, types.Int:
return tm.inttype
case types.Int64, types.Uint64:
return llvm.Int64Type()
case types.Float32:
return llvm.FloatType()
case types.Float64:
return llvm.DoubleType()
case types.UnsafePointer, types.Uintptr:
return tm.target.IntPtrType()
case types.Complex64:
f32 := llvm.FloatType()
elements := []llvm.Type{f32, f32}
return llvm.StructType(elements, false)
case types.Complex128:
f64 := llvm.DoubleType()
elements := []llvm.Type{f64, f64}
return llvm.StructType(elements, false)
case types.String:
i8ptr := llvm.PointerType(llvm.Int8Type(), 0)
elements := []llvm.Type{i8ptr, tm.inttype}
return llvm.StructType(elements, false)
}
panic(fmt.Sprint("unhandled kind: ", b.Kind))
}
func (c *compiler) compareStrings(lhs, rhs *LLVMValue, op token.Token) *LLVMValue {
strcmp := c.runtime.strcmp.LLVMValue()
_string := strcmp.Type().ElementType().ParamTypes()[0]
lhsstr := c.coerceString(lhs.LLVMValue(), _string)
rhsstr := c.coerceString(rhs.LLVMValue(), _string)
args := []llvm.Value{lhsstr, rhsstr}
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.NewValue(result, types.Typ[types.Bool])
}
func (d *CompileUnitDescriptor) mdNode(info *DebugInfo) llvm.Value {
return llvm.MDNode([]llvm.Value{
llvm.ConstInt(llvm.Int32Type(), uint64(d.Tag())+llvm.LLVMDebugVersion, false),
d.Path.path(),
llvm.ConstInt(llvm.Int32Type(), uint64(d.Language), false),
llvm.MDString(d.Producer),
constInt1(d.Optimized),
llvm.MDString(d.CompilerFlags),
llvm.ConstInt(llvm.Int32Type(), uint64(d.Runtime), false),
d.mdNodeList(info, d.EnumTypes),
d.mdNodeList(info, d.RetainedTypes),
d.mdNodeList(info, d.Subprograms),
d.mdNodeList(info, d.GlobalVariables),
d.mdNodeList(info, nil), // List of imported entities
llvm.MDString(""), // Split debug filename
})
}
func (d *CompositeTypeDescriptor) mdNode(info *DebugInfo) llvm.Value {
return llvm.MDNode([]llvm.Value{
llvm.ConstInt(llvm.Int32Type(), llvm.LLVMDebugVersion+uint64(d.Tag()), false),
FileDescriptor(d.File).path(),
info.MDNode(d.Context),
llvm.MDString(d.Name),
llvm.ConstInt(llvm.Int32Type(), uint64(d.Line), false),
llvm.ConstInt(llvm.Int64Type(), d.Size, false),
llvm.ConstInt(llvm.Int64Type(), d.Alignment, false),
llvm.ConstInt(llvm.Int64Type(), d.Offset, false),
llvm.ConstInt(llvm.Int32Type(), uint64(d.Flags), false),
info.MDNode(d.Base), // reference type derived from
llvm.MDNode(info.MDNodes(d.Members)),
llvm.ConstInt(llvm.Int32Type(), uint64(0), false), // Runtime language
llvm.ConstInt(llvm.Int32Type(), uint64(0), false), // Base type containing the vtable pointer for this type
})
}
func (d FileDescriptor) mdNode(info *DebugInfo) llvm.Value {
if d == "" {
return llvm.Value{}
}
return llvm.MDNode([]llvm.Value{
llvm.ConstInt(llvm.Int32Type(), llvm.LLVMDebugVersion+uint64(d.Tag()), false),
d.path(),
})
}
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 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
}
// makeLiteralSlice allocates a new slice, storing in it the provided elements.
func (c *compiler) makeLiteralSlice(v []llvm.Value, elttyp types.Type) llvm.Value {
n := llvm.ConstInt(c.types.inttype, uint64(len(v)), false)
eltType := c.types.ToLLVM(elttyp)
arrayType := llvm.ArrayType(eltType, len(v))
mem := c.createMalloc(llvm.SizeOf(arrayType))
mem = c.builder.CreateIntToPtr(mem, llvm.PointerType(eltType, 0), "")
for i, value := range v {
indices := []llvm.Value{llvm.ConstInt(llvm.Int32Type(), uint64(i), false)}
ep := c.builder.CreateGEP(mem, indices, "")
c.builder.CreateStore(value, ep)
}
slicetyp := types.NewSlice(elttyp)
struct_ := llvm.Undef(c.types.ToLLVM(slicetyp))
struct_ = c.builder.CreateInsertValue(struct_, mem, 0, "")
struct_ = c.builder.CreateInsertValue(struct_, n, 1, "")
struct_ = c.builder.CreateInsertValue(struct_, n, 2, "")
return struct_
}
func NewLLVMTypeMap(target llvm.TargetData) *llvmTypeMap {
// spec says int is either 32-bit or 64-bit.
var inttype llvm.Type
if target.PointerSize() >= 8 {
inttype = llvm.Int64Type()
} else {
inttype = llvm.Int32Type()
}
return &llvmTypeMap{
StdSizes: &types.StdSizes{
WordSize: int64(target.PointerSize()),
MaxAlign: 8,
},
target: target,
inttype: inttype,
ptrstandin: llvm.GlobalContext().StructCreateNamed(""),
}
}
func (d *SubprogramDescriptor) mdNode(info *DebugInfo) llvm.Value {
return llvm.MDNode([]llvm.Value{
llvm.ConstInt(llvm.Int32Type(), llvm.LLVMDebugVersion+uint64(d.Tag()), false),
FileDescriptor(d.File).path(),
info.MDNode(d.Context),
llvm.MDString(d.Name),
llvm.MDString(d.DisplayName),
llvm.MDString(""), // mips linkage name
llvm.ConstInt(llvm.Int32Type(), uint64(d.Line), false),
info.MDNode(d.Type),
llvm.ConstNull(llvm.Int1Type()), // not static
llvm.ConstAllOnes(llvm.Int1Type()), // locally defined (not extern)
llvm.ConstNull(llvm.Int32Type()), // virtuality
llvm.ConstNull(llvm.Int32Type()), // index into a virtual function
info.MDNode(nil), // basetype containing the vtable pointer
llvm.ConstInt(llvm.Int32Type(), 0, false), // flags
llvm.ConstNull(llvm.Int1Type()), // not optimised
d.Function,
info.MDNode(nil), // Template parameters
info.MDNode(nil), // function declaration descriptor
llvm.MDNode(nil), // function variables
llvm.ConstInt(llvm.Int32Type(), uint64(d.ScopeLine), false), // Line number where the scope of the subprogram begins
})
}
// 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())
}
}
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 (c *compiler) chanSelect(states []selectState, blocking bool) *LLVMValue {
stackptr := c.stacksave()
defer c.stackrestore(stackptr)
n := uint64(len(states))
if !blocking {
// blocking means there's no default case
n++
}
lln := llvm.ConstInt(llvm.Int32Type(), n, false)
allocsize := c.builder.CreateCall(c.runtime.selectsize.LLVMValue(), []llvm.Value{lln}, "")
selectp := c.builder.CreateArrayAlloca(llvm.Int8Type(), allocsize, "selectp")
c.memsetZero(selectp, allocsize)
selectp = c.builder.CreatePtrToInt(selectp, c.target.IntPtrType(), "")
c.builder.CreateCall(c.runtime.selectinit.LLVMValue(), []llvm.Value{lln, selectp}, "")
// Allocate stack for the values to send/receive.
//
// TODO(axw) request optimisation in ssa to special-
// case receive cases with no assignment, so we know
// not to allocate stack space or do a copy.
resTypes := []types.Type{types.Typ[types.Int], types.Typ[types.Bool]}
for _, state := range states {
if state.Dir == types.RecvOnly {
chantyp := state.Chan.Type().Underlying().(*types.Chan)
resTypes = append(resTypes, chantyp.Elem())
}
}
resType := tupleType(resTypes...)
llResType := c.types.ToLLVM(resType)
tupleptr := c.builder.CreateAlloca(llResType, "")
c.memsetZero(tupleptr, llvm.SizeOf(llResType))
var recvindex int
ptrs := make([]llvm.Value, len(states))
for i, state := range states {
chantyp := state.Chan.Type().Underlying().(*types.Chan)
elemtyp := c.types.ToLLVM(chantyp.Elem())
if state.Dir == types.SendOnly {
ptrs[i] = c.builder.CreateAlloca(elemtyp, "")
c.builder.CreateStore(state.Send.LLVMValue(), ptrs[i])
} else {
ptrs[i] = c.builder.CreateStructGEP(tupleptr, recvindex+2, "")
recvindex++
}
ptrs[i] = c.builder.CreatePtrToInt(ptrs[i], c.target.IntPtrType(), "")
}
// Create select{send,recv} calls.
selectsend := c.runtime.selectsend.LLVMValue()
selectrecv := c.runtime.selectrecv.LLVMValue()
var received llvm.Value
if recvindex > 0 {
received = c.builder.CreateStructGEP(tupleptr, 1, "")
}
if !blocking {
c.builder.CreateCall(c.runtime.selectdefault.LLVMValue(), []llvm.Value{selectp}, "")
}
for i, state := range states {
ch := state.Chan.LLVMValue()
if state.Dir == types.SendOnly {
c.builder.CreateCall(selectsend, []llvm.Value{selectp, ch, ptrs[i]}, "")
} else {
c.builder.CreateCall(selectrecv, []llvm.Value{selectp, ch, ptrs[i], received}, "")
}
}
// Fire off the select.
index := c.builder.CreateCall(c.runtime.selectgo.LLVMValue(), []llvm.Value{selectp}, "")
tuple := c.builder.CreateLoad(tupleptr, "")
tuple = c.builder.CreateInsertValue(tuple, index, 0, "")
return c.NewValue(tuple, resType)
}
// indirectFunction creates an indirect function from a
// given function and arguments, suitable for use with
// "defer" and "go".
func (c *compiler) indirectFunction(fn *LLVMValue, args []*LLVMValue) *LLVMValue {
nilarytyp := types.NewSignature(nil, nil, nil, nil, false)
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, "")
return c.NewValue(fnval, nilarytyp)
}
// Check if function pointer or context pointer is global/null.
fnval := fn.LLVMValue()
fnptr := fnval
var nctx int
var fnctx llvm.Value
var fnctxindex uint64
var globalfn bool
if fnptr.Type().TypeKind() == llvm.StructTypeKind {
fnptr = c.builder.CreateExtractValue(fnval, 0, "")
fnctx = c.builder.CreateExtractValue(fnval, 1, "")
globalfn = !fnptr.IsAFunction().IsNil()
if !globalfn {
nctx++
}
if !fnctx.IsNull() {
fnctxindex = uint64(nctx)
nctx++
}
} else {
// We've got a raw global function pointer. Convert to <ptr,ctx>.
fnval = llvm.ConstNull(c.types.ToLLVM(fn.Type()))
fnval = llvm.ConstInsertValue(fnval, fnptr, []uint32{0})
fn = c.NewValue(fnval, fn.Type())
fnctx = llvm.ConstExtractValue(fnval, []uint32{1})
globalfn = true
}
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()
}
if !globalfn {
llvmargtypes[0] = fnptr.Type()
llvmargs[0] = fnptr
}
if !fnctx.IsNull() {
llvmargtypes[fnctxindex] = fnctx.Type()
llvmargs[fnctxindex] = fnctx
}
// TODO(axw) investigate an option for go statements
// to allocate argument structure on the stack in the
// initiator, and block until the spawned goroutine
// has loaded the arguments from it.
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)
newargs := make([]*LLVMValue, len(args))
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)}, "")
newargs[i] = c.NewValue(c.builder.CreateLoad(argptr, ""), args[i].Type())
}
// Unless we've got a global function, extract the
// function pointer from the context.
if !globalfn {
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 !fnctx.IsNull() {
fnctxptr := c.builder.CreateGEP(argstruct, []llvm.Value{
llvm.ConstInt(llvm.Int32Type(), 0, false),
llvm.ConstInt(llvm.Int32Type(), fnctxindex, false)}, "")
fnctx = c.builder.CreateLoad(fnctxptr, "")
fnval = c.builder.CreateInsertValue(fnval, fnctx, 1, "")
fn = c.NewValue(fnval, fn.Type())
}
c.createCall(fn, newargs)
// 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 (d *CompileUnitDescriptor) mdNodeList(info *DebugInfo, list []DebugDescriptor) llvm.Value {
if len(list) > 0 {
return llvm.MDNode(info.MDNodes(list))
}
return llvm.MDNode([]llvm.Value{llvm.ConstNull(llvm.Int32Type())})
}
