/
method.go
352 lines (326 loc) · 10.3 KB
/
method.go
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package compiler
import (
"fmt"
"github.com/actgardner/gogen-avro/schema"
"github.com/actgardner/gogen-avro/vm"
)
type irMethod struct {
name string
offset int
body []irInstruction
program *irProgram
}
func newIRMethod(name string, program *irProgram) *irMethod {
return &irMethod{
name: name,
body: make([]irInstruction, 0),
program: program,
}
}
func (p *irMethod) addLiteral(op vm.Op, operand int) {
p.body = append(p.body, &literalIRInstruction{vm.Instruction{op, operand}})
}
func (p *irMethod) addMethodCall(method string) {
p.body = append(p.body, &methodCallIRInstruction{method})
}
func (p *irMethod) addBlockStart() int {
id := len(p.program.blocks)
p.program.blocks = append(p.program.blocks, &irBlock{})
p.body = append(p.body, &blockStartIRInstruction{id})
return id
}
func (p *irMethod) addBlockEnd(id int) {
p.body = append(p.body, &blockEndIRInstruction{id})
}
func (p *irMethod) addSwitchStart(size, errorId int) int {
id := len(p.program.switches)
p.program.switches = append(p.program.switches, &irSwitch{0, make(map[int]int), 0})
p.body = append(p.body, &switchStartIRInstruction{id, size, errorId})
return id
}
func (p *irMethod) addSwitchCase(id, writerIndex, readerIndex int) {
p.body = append(p.body, &switchCaseIRInstruction{id, writerIndex, readerIndex})
}
func (p *irMethod) addSwitchEnd(id int) {
p.body = append(p.body, &switchEndIRInstruction{id})
}
func (p *irMethod) addError(msg string) int {
id := len(p.program.errors) + 1
p.program.errors = append(p.program.errors, msg)
return id
}
func (p *irMethod) VMLength() int {
len := 0
for _, inst := range p.body {
len += inst.VMLength()
}
return len
}
func (p *irMethod) compileType(writer, reader schema.AvroType) error {
log("compileType()\n writer:\n %v\n---\nreader: %v\n---\n", writer, reader)
// If the writer is not a union but the reader is, try and find the first matching type in the union as a target
if _, ok := writer.(*schema.UnionField); !ok {
if readerUnion, ok := reader.(*schema.UnionField); ok {
for readerIndex, r := range readerUnion.AvroTypes() {
if writer.IsReadableBy(r, make(map[schema.QualifiedName]interface{})) {
p.addLiteral(vm.SetLong, readerIndex)
p.addLiteral(vm.Set, vm.Long)
p.addLiteral(vm.Enter, readerIndex)
err := p.compileType(writer, r)
if err != nil {
return err
}
p.addLiteral(vm.Exit, vm.NoopField)
return nil
}
}
return fmt.Errorf("Incompatible types: %v %v", reader, writer)
}
}
switch v := writer.(type) {
case *schema.Reference:
if readerRef, ok := reader.(*schema.Reference); ok || reader == nil {
return p.compileRef(v, readerRef)
}
return fmt.Errorf("Incompatible types: %v %v", reader, writer)
case *schema.MapField:
if readerRef, ok := reader.(*schema.MapField); ok || reader == nil {
return p.compileMap(v, readerRef)
}
return fmt.Errorf("Incompatible types: %v %v", reader, writer)
case *schema.ArrayField:
if readerRef, ok := reader.(*schema.ArrayField); ok || reader == nil {
return p.compileArray(v, readerRef)
}
return fmt.Errorf("Incompatible types: %v %v", reader, writer)
case *schema.UnionField:
return p.compileUnion(v, reader)
case *schema.IntField:
p.addLiteral(vm.Read, vm.Int)
if reader != nil {
p.addLiteral(vm.Set, vm.Int)
}
return nil
case *schema.LongField:
p.addLiteral(vm.Read, vm.Long)
if reader != nil {
p.addLiteral(vm.Set, vm.Long)
}
return nil
case *schema.StringField:
p.addLiteral(vm.Read, vm.String)
if reader != nil {
p.addLiteral(vm.Set, vm.String)
}
return nil
case *schema.BytesField:
p.addLiteral(vm.Read, vm.Bytes)
if reader != nil {
p.addLiteral(vm.Set, vm.Bytes)
}
return nil
case *schema.FloatField:
p.addLiteral(vm.Read, vm.Float)
if reader != nil {
p.addLiteral(vm.Set, vm.Float)
}
return nil
case *schema.DoubleField:
p.addLiteral(vm.Read, vm.Double)
if reader != nil {
p.addLiteral(vm.Set, vm.Double)
}
return nil
case *schema.BoolField:
p.addLiteral(vm.Read, vm.Boolean)
if reader != nil {
p.addLiteral(vm.Set, vm.Boolean)
}
return nil
case *schema.NullField:
return nil
}
return fmt.Errorf("Unsupported type: %t", writer)
}
func (p *irMethod) compileRef(writer, reader *schema.Reference) error {
log("compileRef()\n writer:\n %v\n---\nreader: %v\n---\n", writer, reader)
if reader != nil && writer.TypeName.Name != reader.TypeName.Name {
return fmt.Errorf("Incompatible types by name: %v %v", reader, writer)
}
switch writer.Def.(type) {
case *schema.RecordDefinition:
var readerDef *schema.RecordDefinition
var ok bool
recordMethodName := fmt.Sprintf("record-r-%v", writer.Def.Name())
if reader != nil {
if readerDef, ok = reader.Def.(*schema.RecordDefinition); !ok {
return fmt.Errorf("Incompatible types: %v %v", reader, writer)
}
recordMethodName = fmt.Sprintf("record-rw-%v", writer.Def.Name())
}
if _, ok := p.program.methods[recordMethodName]; !ok {
method := p.program.createMethod(recordMethodName)
err := method.compileRecord(writer.Def.(*schema.RecordDefinition), readerDef)
if err != nil {
return err
}
}
p.addMethodCall(recordMethodName)
return nil
case *schema.FixedDefinition:
var readerDef *schema.FixedDefinition
var ok bool
if reader != nil {
if readerDef, ok = reader.Def.(*schema.FixedDefinition); !ok {
return fmt.Errorf("Incompatible types: %v %v", reader, writer)
}
}
return p.compileFixed(writer.Def.(*schema.FixedDefinition), readerDef)
case *schema.EnumDefinition:
var readerDef *schema.EnumDefinition
var ok bool
if reader != nil {
if readerDef, ok = reader.Def.(*schema.EnumDefinition); !ok {
return fmt.Errorf("Incompatible types: %v %v", reader, writer)
}
}
return p.compileEnum(writer.Def.(*schema.EnumDefinition), readerDef)
}
return fmt.Errorf("Unsupported reference type %T", reader)
}
func (p *irMethod) compileMap(writer, reader *schema.MapField) error {
log("compileMap()\n writer:\n %v\n---\nreader: %v\n---\n", writer, reader)
blockId := p.addBlockStart()
p.addLiteral(vm.Read, vm.String)
var readerType schema.AvroType
if reader != nil {
p.addLiteral(vm.AppendMap, vm.Unused)
readerType = reader.ItemType()
}
err := p.compileType(writer.ItemType(), readerType)
if err != nil {
return err
}
if reader != nil {
p.addLiteral(vm.Exit, vm.Unused)
}
p.addBlockEnd(blockId)
return nil
}
func (p *irMethod) compileArray(writer, reader *schema.ArrayField) error {
log("compileArray()\n writer:\n %v\n---\nreader: %v\n---\n", writer, reader)
blockId := p.addBlockStart()
var readerType schema.AvroType
if reader != nil {
p.addLiteral(vm.AppendArray, vm.Unused)
readerType = reader.ItemType()
}
err := p.compileType(writer.ItemType(), readerType)
if err != nil {
return err
}
if reader != nil {
p.addLiteral(vm.Exit, vm.Unused)
}
p.addBlockEnd(blockId)
return nil
}
func (p *irMethod) compileRecord(writer, reader *schema.RecordDefinition) error {
// Look up whether there's a corresonding target field and if so, parse the source field into that target
log("compileRecord()\n writer:\n %v\n---\nreader: %v\n---\n", writer, reader)
if reader != nil {
for _, field := range reader.Fields() {
if writerField := writer.GetReaderField(field); writerField == nil {
if !field.HasDefault() {
return fmt.Errorf("Incompatible schemas: field %v in reader is not present in writer and has no default value", field.Name())
}
p.addLiteral(vm.SetDefault, field.Index())
}
}
}
for _, field := range writer.Fields() {
var readerType schema.AvroType
var readerField *schema.Field
if reader != nil {
readerField = reader.GetReaderField(field)
if readerField != nil {
if !field.Type().IsReadableBy(readerField.Type(), make(map[schema.QualifiedName]interface{})) {
return fmt.Errorf("Incompatible schemas: field %v in reader has incompatible type in writer", field.Name())
}
readerType = readerField.Type()
p.addLiteral(vm.Enter, readerField.Index())
}
}
err := p.compileType(field.Type(), readerType)
if err != nil {
return err
}
if readerField != nil {
p.addLiteral(vm.Exit, vm.NoopField)
}
}
return nil
}
func (p *irMethod) compileEnum(writer, reader *schema.EnumDefinition) error {
log("compileEnum()\n writer:\n %v\n---\nreader: %v\n---\n", writer, reader)
p.addLiteral(vm.Read, vm.Int)
if reader != nil {
p.addLiteral(vm.Set, vm.Int)
}
return nil
}
func (p *irMethod) compileFixed(writer, reader *schema.FixedDefinition) error {
log("compileFixed()\n writer:\n %v\n---\nreader: %v\n---\n", writer, reader)
p.addLiteral(vm.Read, 11+writer.SizeBytes())
if reader != nil {
p.addLiteral(vm.Set, vm.Bytes)
}
return nil
}
func (p *irMethod) compileUnion(writer *schema.UnionField, reader schema.AvroType) error {
log("compileUnion()\n writer:\n %v\n---\nreader: %v\n---\n", writer, reader)
p.addLiteral(vm.Read, vm.Long)
errId := p.addError("Unsupported type for union")
switchId := p.addSwitchStart(len(writer.AvroTypes()), errId)
writer:
for i, t := range writer.AvroTypes() {
if reader == nil {
// If the reader is nil, just read the field and move on
p.addSwitchCase(switchId, i, -1)
err := p.compileType(t, reader)
if err != nil {
return err
}
} else if unionReader, ok := reader.(*schema.UnionField); ok {
// If the reader is also a union, read into the first supported type
for readerIndex, r := range unionReader.AvroTypes() {
if t.IsReadableBy(r, make(map[schema.QualifiedName]interface{})) {
p.addSwitchCase(switchId, i, readerIndex)
p.addLiteral(vm.Enter, readerIndex)
err := p.compileType(t, r)
if err != nil {
return err
}
p.addLiteral(vm.Exit, vm.NoopField)
continue writer
}
}
p.addSwitchCase(switchId, i, -1)
typedErrId := p.addError(fmt.Sprintf("Reader schema has no field for type %v in union", t.Name()))
p.addLiteral(vm.Halt, typedErrId)
} else if t.IsReadableBy(reader, make(map[schema.QualifiedName]interface{})) {
// If the reader is not a union but it can read this union field, support it
p.addSwitchCase(switchId, i, -1)
err := p.compileType(t, reader)
if err != nil {
return err
}
} else {
p.addSwitchCase(switchId, i, -1)
typedErrId := p.addError(fmt.Sprintf("Reader schema has no field for type %v in union", t.Name()))
p.addLiteral(vm.Halt, typedErrId)
}
}
p.addSwitchEnd(switchId)
return nil
}