func (d *DIBuilder) descriptorInterface(t *types.Interface, name string) llvm.Metadata {
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 d.typeDebugDescriptor(ifaceStruct, name)
}
func (d *DIBuilder) descriptorSlice(t *types.Slice, name string) llvm.Metadata {
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 d.typeDebugDescriptor(sliceStruct, name)
}
func (d *DIBuilder) descriptorSignature(t *types.Signature, name string) llvm.Metadata {
// If there's a receiver change the receiver to an
// additional (first) parameter, and take the value of
// the resulting signature instead.
if recv := t.Recv(); recv != nil {
params := t.Params()
paramvars := make([]*types.Var, int(params.Len()+1))
paramvars[0] = recv
for i := 0; i < int(params.Len()); i++ {
paramvars[i+1] = params.At(i)
}
params = types.NewTuple(paramvars...)
t := types.NewSignature(nil, nil, params, t.Results(), t.Variadic())
return d.typeDebugDescriptor(t, name)
}
if dt, ok := d.types.At(t).(llvm.Metadata); ok {
return dt
}
var returnType llvm.Metadata
results := t.Results()
switch n := results.Len(); n {
case 0:
returnType = d.DIType(nil) // void
case 1:
returnType = d.DIType(results.At(0).Type())
default:
fields := make([]*types.Var, results.Len())
for i := range fields {
f := results.At(i)
// Structs may not have multiple fields
// with the same name, excepting "_".
if f.Name() == "" {
f = types.NewVar(f.Pos(), f.Pkg(), "_", f.Type())
}
fields[i] = f
}
returnType = d.typeDebugDescriptor(types.NewStruct(fields, nil), "")
}
var paramTypes []llvm.Metadata
params := t.Params()
if params != nil && params.Len() > 0 {
paramTypes = make([]llvm.Metadata, params.Len()+1)
paramTypes[0] = returnType
for i := range paramTypes[1:] {
paramTypes[i+1] = d.DIType(params.At(i).Type())
}
} else {
paramTypes = []llvm.Metadata{returnType}
}
// TODO(axw) get position of type definition for File field
return d.builder.CreateSubroutineType(llvm.DISubroutineType{
Parameters: paramTypes,
})
}
// newMethod creates a new method of the specified name, package and receiver type.
func newMethod(pkg *ssa.Package, recvType types.Type, name string) *ssa.Function {
// TODO(adonovan): fix: hack: currently the only part of Signature
// that is needed is the "pointerness" of Recv.Type, and for
// now, we'll set it to always be false since we're only
// concerned with rtype. Encapsulate this better.
sig := types.NewSignature(nil, types.NewVar(token.NoPos, nil, "recv", recvType), nil, nil, false)
fn := pkg.Prog.NewFunction(name, sig, "fake reflect method")
fn.Pkg = pkg
return fn
}
func (d *DIBuilder) descriptorBasic(t *types.Basic, name string) llvm.Metadata {
switch t.Kind() {
case types.String:
return d.typeDebugDescriptor(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 d.builder.CreateBasicType(llvm.DIBasicType{
Name: name,
SizeInBits: uint64(d.sizes.Sizeof(t) * 8),
AlignInBits: uint64(d.sizes.Alignof(t) * 8),
Encoding: llvm.DW_ATE_unsigned,
})
default:
bt := llvm.DIBasicType{
Name: t.String(),
SizeInBits: uint64(d.sizes.Sizeof(t) * 8),
AlignInBits: uint64(d.sizes.Alignof(t) * 8),
}
switch bi := t.Info(); {
case bi&types.IsBoolean != 0:
bt.Encoding = llvm.DW_ATE_boolean
case bi&types.IsUnsigned != 0:
bt.Encoding = llvm.DW_ATE_unsigned
case bi&types.IsInteger != 0:
bt.Encoding = llvm.DW_ATE_signed
case bi&types.IsFloat != 0:
bt.Encoding = llvm.DW_ATE_float
case bi&types.IsComplex != 0:
bt.Encoding = llvm.DW_ATE_imaginary_float
case bi&types.IsUnsigned != 0:
bt.Encoding = llvm.DW_ATE_unsigned
default:
panic(fmt.Sprintf("unhandled: %#v", t))
}
return d.builder.CreateBasicType(bt)
}
}
func (p *importer) obj(pkg *types.Package) {
var obj types.Object
switch tag := p.int(); tag {
case constTag:
obj = types.NewConst(token.NoPos, pkg, p.string(), p.typ(), p.value())
case typeTag:
// type object is added to scope via respective named type
_ = p.typ().(*types.Named)
return
case varTag:
obj = types.NewVar(token.NoPos, pkg, p.string(), p.typ())
case funcTag:
obj = types.NewFunc(token.NoPos, pkg, p.string(), p.typ().(*types.Signature))
default:
panic(fmt.Sprintf("unexpected object tag %d", tag))
}
if alt := pkg.Scope().Insert(obj); alt != nil {
panic(fmt.Sprintf("%s already declared", alt.Name()))
}
}
// Parameter = ( identifier | "?" ) [ "..." ] Type [ string_lit ] .
//
func (p *parser) parseParameter() (par *types.Var, isVariadic bool) {
_, name := p.parseName(false)
// remove gc-specific parameter numbering
if i := strings.Index(name, "·"); i >= 0 {
name = name[:i]
}
if p.tok == '.' {
p.expectSpecial("...")
isVariadic = true
}
typ := p.parseType()
if isVariadic {
typ = types.NewSlice(typ)
}
// ignore argument tag (e.g. "noescape")
if p.tok == scanner.String {
p.next()
}
// TODO(gri) should we provide a package?
par = types.NewVar(token.NoPos, nil, name, typ)
return
}
// VarDecl = "var" ExportedName Type .
//
func (p *parser) parseVarDecl() {
p.expectKeyword("var")
pkg, name := p.parseExportedName()
typ := p.parseType()
pkg.Scope().Insert(types.NewVar(token.NoPos, pkg, name, typ))
}
// Var = Name Type .
func (p *parser) parseVar(pkg *types.Package) *types.Var {
name := p.parseName()
return types.NewVar(token.NoPos, pkg, name, p.parseType(pkg))
}
func (p *importer) param() *types.Var {
return types.NewVar(token.NoPos, nil, p.string(), p.typ())
}