func (m *TypeMap) descriptorInterface(t *types.Interface, name string) TypeDebugDescriptor {
ifaceStruct := types.NewStruct([]*types.Var{
types.NewVar(0, nil, "type", types.NewPointer(types.Typ[types.Uint8])),
types.NewVar(0, nil, "data", types.NewPointer(types.Typ[types.Uint8])),
}, nil)
return m.typeDebugDescriptor(ifaceStruct, name)
}
// tupleType returns a struct type with anonymous
// fields with the specified types.
func tupleType(fieldTypes ...types.Type) types.Type {
vars := make([]*types.Var, len(fieldTypes))
for i, t := range fieldTypes {
vars[i] = types.NewParam(0, nil, fmt.Sprintf("f%d", i), t)
}
return types.NewStruct(vars, nil)
}
func (m *TypeMap) descriptorSlice(t *types.Slice, name string) TypeDebugDescriptor {
sliceStruct := types.NewStruct([]*types.Var{
types.NewVar(0, nil, "ptr", types.NewPointer(t.Elem())),
types.NewVar(0, nil, "len", types.Typ[types.Int]),
types.NewVar(0, nil, "cap", types.Typ[types.Int]),
}, nil)
return m.typeDebugDescriptor(sliceStruct, name)
}
// StructType = "struct" "{" { Field } "}" .
func (p *parser) parseStructType(pkg *types.Package) types.Type {
p.expectKeyword("struct")
var fields []*types.Var
var tags []string
p.expect('{')
for p.tok != '}' && p.tok != scanner.EOF {
field, tag := p.parseField(pkg)
p.expect(';')
fields = append(fields, field)
tags = append(tags, tag)
}
p.expect('}')
return types.NewStruct(fields, tags)
}
func (m *TypeMap) descriptorBasic(t *types.Basic, name string) TypeDebugDescriptor {
switch t.Kind() {
case types.String:
return m.descriptorStruct(types.NewStruct([]*types.Var{
types.NewVar(0, nil, "ptr", types.NewPointer(types.Typ[types.Uint8])),
types.NewVar(0, nil, "len", types.Typ[types.Int]),
}, nil), name)
case types.UnsafePointer:
return &BasicTypeDescriptor{
TypeDescriptorCommon: TypeDescriptorCommon{
Name: name,
Size: uint64(m.Sizes.Sizeof(t) * 8),
Alignment: uint64(m.Sizes.Alignof(t) * 8),
},
TypeEncoding: DW_ATE_unsigned,
}
default:
bt := &BasicTypeDescriptor{
TypeDescriptorCommon: TypeDescriptorCommon{
Name: t.String(),
Size: uint64(m.Sizes.Sizeof(t) * 8),
Alignment: uint64(m.Sizes.Alignof(t) * 8),
},
}
switch bi := t.Info(); {
case bi&types.IsBoolean != 0:
bt.TypeEncoding = DW_ATE_boolean
case bi&types.IsUnsigned != 0:
bt.TypeEncoding = DW_ATE_unsigned
case bi&types.IsInteger != 0:
bt.TypeEncoding = DW_ATE_signed
case bi&types.IsFloat != 0:
bt.TypeEncoding = DW_ATE_float
case bi&types.IsComplex != 0:
bt.TypeEncoding = DW_ATE_imaginary_float
case bi&types.IsUnsigned != 0:
bt.TypeEncoding = DW_ATE_unsigned
default:
panic(fmt.Sprintf("unhandled: %#v", t))
}
return bt
}
}
// StructType = "struct" "{" [ FieldList ] "}" .
// FieldList = Field { ";" Field } .
//
func (p *parser) parseStructType() types.Type {
var fields []*types.Var
var tags []string
p.expectKeyword("struct")
p.expect('{')
for i := 0; p.tok != '}' && p.tok != scanner.EOF; i++ {
if i > 0 {
p.expect(';')
}
fld, tag := p.parseField()
if tag != "" && tags == nil {
tags = make([]string, i)
}
if tags != nil {
tags = append(tags, tag)
}
fields = append(fields, fld)
}
p.expect('}')
return types.NewStruct(fields, tags)
}
func (cdd *CDD) tupleName(tup *types.Tuple) (tupName string, fields []*types.Var, acds []*CDD) {
n := tup.Len()
for i := 0; i < n; i++ {
if i != 0 {
tupName += "$$"
}
name, dim, a := cdd.TypeStr(tup.At(i).Type())
tupName += dimFuncPtr(name, dim)
acds = append(acds, a...)
}
tupName = strings.Map(symToDol, tupName)
fields = make([]*types.Var, n)
for i := 0; i < n; i++ {
v := tup.At(i)
fields[i] = types.NewField(
v.Pos(), v.Pkg(), "_"+strconv.Itoa(i), v.Type(), false,
)
}
if _, ok := cdd.gtc.tupNames[tupName]; ok {
return
}
cdd.gtc.tupNames[tupName] = struct{}{}
s := types.NewStruct(fields, nil)
o := types.NewTypeName(tup.At(0).Pos(), cdd.gtc.pkg, tupName, s)
acd := cdd.gtc.newCDD(o, TypeDecl, 0)
acd.structDecl(new(bytes.Buffer), tupName, s)
cdd.DeclUses[o] = true
acds = append(acds, acd)
return
}
func (p *importer) typ() types.Type {
// if the type was seen before, i is its index (>= 0)
i := p.int()
if i >= 0 {
return p.typList[i]
}
// otherwise, i is the type tag (< 0)
switch i {
case arrayTag:
t := new(types.Array)
p.record(t)
n := p.int64()
*t = *types.NewArray(p.typ(), n)
return t
case sliceTag:
t := new(types.Slice)
p.record(t)
*t = *types.NewSlice(p.typ())
return t
case structTag:
t := new(types.Struct)
p.record(t)
n := p.int()
fields := make([]*types.Var, n)
tags := make([]string, n)
for i := range fields {
fields[i] = p.field()
tags[i] = p.string()
}
*t = *types.NewStruct(fields, tags)
return t
case pointerTag:
t := new(types.Pointer)
p.record(t)
*t = *types.NewPointer(p.typ())
return t
case signatureTag:
t := new(types.Signature)
p.record(t)
*t = *p.signature()
return t
case interfaceTag:
t := new(types.Interface)
p.record(t)
// read embedded interfaces
embeddeds := make([]*types.Named, p.int())
for i := range embeddeds {
embeddeds[i] = p.typ().(*types.Named)
}
// read methods
methods := make([]*types.Func, p.int())
for i := range methods {
pkg, name := p.qualifiedName()
methods[i] = types.NewFunc(token.NoPos, pkg, name, p.typ().(*types.Signature))
}
*t = *types.NewInterface(methods, embeddeds)
return t
case mapTag:
t := new(types.Map)
p.record(t)
*t = *types.NewMap(p.typ(), p.typ())
return t
case chanTag:
t := new(types.Chan)
p.record(t)
*t = *types.NewChan(types.ChanDir(p.int()), p.typ())
return t
case namedTag:
// read type object
name := p.string()
pkg := p.pkg()
scope := pkg.Scope()
obj := scope.Lookup(name)
// if the object doesn't exist yet, create and insert it
if obj == nil {
obj = types.NewTypeName(token.NoPos, pkg, name, nil)
scope.Insert(obj)
}
// associate new named type with obj if it doesn't exist yet
t0 := types.NewNamed(obj.(*types.TypeName), nil, nil)
// but record the existing type, if any
t := obj.Type().(*types.Named)
p.record(t)
// read underlying type
t0.SetUnderlying(p.typ())
// read associated methods
for i, n := 0, p.int(); i < n; i++ {
t0.AddMethod(types.NewFunc(token.NoPos, pkg, p.string(), p.typ().(*types.Signature)))
}
return t
default:
panic(fmt.Sprintf("unexpected type tag %d", i))
}
}
func (c *compiler) VisitFuncLit(lit *ast.FuncLit) Value {
ftyp := c.types.expr[lit].Type.(*types.Signature)
// Walk the function literal, promoting stack vars not defined
// in the function literal, and storing the ident's for non-const
// values not declared in the function literal.
//
// (First, set a dummy "stack" value for the params and results.)
var dummyfunc LLVMValue
dummyfunc.stack = &dummyfunc
paramVars := ftyp.Params()
resultVars := ftyp.Results()
c.functions.push(&function{
LLVMValue: &dummyfunc,
results: resultVars,
})
v := &identVisitor{compiler: c}
ast.Walk(v, lit.Body)
c.functions.pop()
// Create closure by adding a context parameter to the function,
// and bind it with the values of the stack vars found in the
// step above.
origfnpairtyp := c.types.ToLLVM(ftyp)
fnpairtyp := origfnpairtyp
fntyp := origfnpairtyp.StructElementTypes()[0].ElementType()
if v.captures != nil {
// Add the additional context param.
ctxfields := make([]*types.Field, len(v.captures))
for i, capturevar := range v.captures {
ctxfields[i] = &types.Field{
Type: types.NewPointer(capturevar.Type()),
}
}
ctxtyp := types.NewPointer(types.NewStruct(ctxfields, nil))
llvmctxtyp := c.types.ToLLVM(ctxtyp)
rettyp := fntyp.ReturnType()
paramtyps := append([]llvm.Type{llvmctxtyp}, fntyp.ParamTypes()...)
vararg := fntyp.IsFunctionVarArg()
fntyp = llvm.FunctionType(rettyp, paramtyps, vararg)
opaqueptrtyp := origfnpairtyp.StructElementTypes()[1]
elttyps := []llvm.Type{llvm.PointerType(fntyp, 0), opaqueptrtyp}
fnpairtyp = llvm.StructType(elttyps, false)
}
fnptr := llvm.AddFunction(c.module.Module, "", fntyp)
fnvalue := llvm.ConstNull(fnpairtyp)
fnvalue = llvm.ConstInsertValue(fnvalue, fnptr, []uint32{0})
currBlock := c.builder.GetInsertBlock()
f := c.NewValue(fnvalue, ftyp)
captureVars := types.NewTuple(v.captures...)
c.buildFunction(f, captureVars, paramVars, resultVars, lit.Body, ftyp.IsVariadic())
// Closure? Bind values to a context block.
if v.captures != nil {
// Store the free variables in the heap allocated block.
block := c.createTypeMalloc(fntyp.ParamTypes()[0].ElementType())
for i, contextvar := range v.captures {
value := c.objectdata[contextvar].Value
blockPtr := c.builder.CreateStructGEP(block, i, "")
c.builder.CreateStore(value.pointer.LLVMValue(), blockPtr)
}
// Cast the function pointer type back to the original
// type, without the context parameter.
fnptr = llvm.ConstBitCast(fnptr, origfnpairtyp.StructElementTypes()[0])
fnvalue = llvm.Undef(origfnpairtyp)
fnvalue = llvm.ConstInsertValue(fnvalue, fnptr, []uint32{0})
// Set the context value.
i8ptr := llvm.PointerType(llvm.Int8Type(), 0)
block = c.builder.CreateBitCast(block, i8ptr, "")
fnvalue = c.builder.CreateInsertValue(fnvalue, block, 1, "")
f.value = fnvalue
} else {
c.builder.SetInsertPointAtEnd(currBlock)
}
return f
}