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compiler_measure.go
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/
compiler_measure.go
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/*
* Copyright 2022 ByteDance Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package encoder
import (
`math`
`github.com/cloudwego/frugal/internal/atm/abi`
`github.com/cloudwego/frugal/internal/binary/defs`
)
func (self *Compiler) measure(p *Program, sp int, vt *defs.Type, startpc int) {
rt := vt.S
tt := vt.T
/* only recurse on structs */
if tt != defs.T_struct {
self.measureOne(p, sp, vt, startpc)
return
}
/* check for loops with inlining depth limit */
if self.t[rt] || !self.o.CanInline(sp, (p.pc() - startpc) * 2) {
p.rtt(OP_size_defer, rt)
return
}
/* measure the type recursively */
self.t[rt] = true
self.measureOne(p, sp, vt, startpc)
delete(self.t, rt)
}
func (self *Compiler) measureOne(p *Program, sp int, vt *defs.Type, startpc int) {
switch vt.T {
case defs.T_bool : p.i64(OP_size_const, 1)
case defs.T_i8 : p.i64(OP_size_const, 1)
case defs.T_i16 : p.i64(OP_size_const, 2)
case defs.T_i32 : p.i64(OP_size_const, 4)
case defs.T_i64 : p.i64(OP_size_const, 8)
case defs.T_enum : p.i64(OP_size_const, 4)
case defs.T_double : p.i64(OP_size_const, 8)
case defs.T_string : p.i64(OP_size_const, 4); p.dyn(OP_size_dyn, abi.PtrSize, 1)
case defs.T_binary : p.i64(OP_size_const, 4); p.dyn(OP_size_dyn, abi.PtrSize, 1)
case defs.T_map : self.measureMap(p, sp, vt, startpc)
case defs.T_set : self.measureSeq(p, sp, vt, startpc)
case defs.T_list : self.measureSeq(p, sp, vt, startpc)
case defs.T_struct : self.measureStruct(p, sp, vt, startpc)
case defs.T_pointer : self.measurePtr(p, sp, vt, startpc)
default : panic("measureOne: unreachable")
}
}
func (self *Compiler) measurePtr(p *Program, sp int, vt *defs.Type, startpc int) {
i := p.pc()
p.tag(sp)
p.add(OP_if_nil)
p.add(OP_make_state)
p.add(OP_deref)
self.measure(p, sp + 1, vt.V, startpc)
p.add(OP_drop_state)
p.pin(i)
}
func (self *Compiler) measureMap(p *Program, sp int, vt *defs.Type, startpc int) {
nk := defs.GetSize(vt.K.S)
nv := defs.GetSize(vt.V.S)
/* 6-byte map header */
p.tag(sp)
p.i64(OP_size_const, 6)
/* check for nil maps */
i := p.pc()
p.add(OP_if_nil)
/* key and value are both trivially measuable */
if nk > 0 && nv > 0 {
p.i64(OP_size_map, int64(nk + nv))
p.pin(i)
return
}
/* key or value is trivially measuable */
if nk > 0 { p.i64(OP_size_map, int64(nk)) }
if nv > 0 { p.i64(OP_size_map, int64(nv)) }
/* complex maps */
j := p.pc()
p.add(OP_map_if_empty)
p.add(OP_make_state)
p.rtt(OP_map_begin, vt.S)
k := p.pc()
/* complex keys */
if nk <= 0 {
p.add(OP_map_key)
self.measure(p, sp + 1, vt.K, startpc)
}
/* complex values */
if nv <= 0 {
p.add(OP_map_value)
self.measure(p, sp + 1, vt.V, startpc)
}
/* move to the next state */
p.add(OP_map_next)
p.jmp(OP_map_if_next, k)
p.add(OP_drop_state)
p.pin(i)
p.pin(j)
}
func (self *Compiler) measureSeq(p *Program, sp int, vt *defs.Type, startpc int) {
et := vt.V
nb := defs.GetSize(et.S)
/* 5-byte list or set header */
p.tag(sp)
p.i64(OP_size_const, 5)
/* check for nil slice */
i := p.pc()
p.add(OP_if_nil)
/* element is trivially measuable */
if nb > 0 {
p.dyn(OP_size_dyn, abi.PtrSize, int64(nb))
p.pin(i)
return
}
/* complex lists or sets */
j := p.pc()
p.add(OP_list_if_empty)
p.add(OP_make_state)
p.add(OP_list_begin)
k := p.pc()
p.add(OP_goto)
r := p.pc()
p.i64(OP_seek, int64(et.S.Size()))
p.pin(k)
self.measure(p, sp + 1, et, startpc)
p.add(OP_list_decr)
p.jmp(OP_list_if_next, r)
p.add(OP_drop_state)
p.pin(i)
p.pin(j)
}
func (self *Compiler) measureStruct(p *Program, sp int, vt *defs.Type, startpc int) {
var err error
var fvs []defs.Field
/* struct is trivially measuable */
if nb := defs.GetSize(vt.S); nb > 0 {
p.i64(OP_size_const, int64(nb))
return
}
/* resolve the field */
if fvs, err = defs.ResolveFields(vt.S); err != nil {
panic(err)
}
/* empty structs */
if len(fvs) == 0 {
p.i64(OP_size_const, 4)
return
}
/* 1-byte stop field */
p.tag(sp)
p.i64(OP_size_const, 1)
/* measure every field */
for _, fv := range fvs {
p.i64(OP_seek, int64(fv.F))
self.measureField(p, sp + 1, fv, startpc)
p.i64(OP_seek, -int64(fv.F))
}
}
func (self *Compiler) measureField(p *Program, sp int, fv defs.Field, startpc int) {
switch fv.Type.T {
default: {
panic("fatal: invalid field type: " + fv.Type.String())
}
/* non-pointer types */
case defs.T_bool : fallthrough
case defs.T_i8 : fallthrough
case defs.T_double : fallthrough
case defs.T_i16 : fallthrough
case defs.T_i32 : fallthrough
case defs.T_i64 : fallthrough
case defs.T_string : fallthrough
case defs.T_enum : fallthrough
case defs.T_binary : {
if fv.Default.IsValid() && fv.Spec == defs.Optional {
self.measureStructDefault(p, sp, fv, startpc)
} else {
self.measureStructRequired(p, sp, fv, startpc)
}
}
/* struct types, only available in hand-written structs */
case defs.T_struct: {
self.measureStructRequired(p, sp, fv, startpc)
}
/* sequencial types */
case defs.T_map : fallthrough
case defs.T_set : fallthrough
case defs.T_list : {
if fv.Spec == defs.Optional {
self.measureStructIterable(p, sp, fv, startpc)
} else {
self.measureStructRequired(p, sp, fv, startpc)
}
}
/* pointers */
case defs.T_pointer: {
if fv.Spec == defs.Optional {
self.measureStructOptional(p, sp, fv, startpc)
} else if fv.Type.V.T == defs.T_struct {
self.measureStructPointer(p, sp, fv, startpc)
} else {
panic("fatal: non-optional non-struct pointers")
}
}
}
}
func (self *Compiler) measureStructDefault(p *Program, sp int, fv defs.Field, startpc int) {
i := p.pc()
t := fv.Type.T
/* check for default values */
switch t {
case defs.T_bool : p.dyn(OP_if_eq_imm, 1, bool2i64(fv.Default.Bool()))
case defs.T_i8 : p.dyn(OP_if_eq_imm, 1, fv.Default.Int())
case defs.T_double : p.dyn(OP_if_eq_imm, 8, int64(math.Float64bits(fv.Default.Float())))
case defs.T_i16 : p.dyn(OP_if_eq_imm, 2, fv.Default.Int())
case defs.T_i32 : p.dyn(OP_if_eq_imm, 4, fv.Default.Int())
case defs.T_i64 : p.dyn(OP_if_eq_imm, 8, fv.Default.Int())
case defs.T_string : p.str(OP_if_eq_str, fv.Default.String())
case defs.T_enum : p.dyn(OP_if_eq_imm, 4, fv.Default.Int())
case defs.T_binary : p.str(OP_if_eq_str, mem2str(fv.Default.Bytes()))
default : panic("unreachable")
}
/* measure if it's not the default value */
p.i64(OP_size_const, 3)
self.measure(p, sp, fv.Type, startpc)
p.pin(i)
}
func (self *Compiler) measureStructPointer(p *Program, sp int, fv defs.Field, startpc int) {
i := p.pc()
p.add(OP_if_nil)
p.i64(OP_size_const, 3)
p.add(OP_make_state)
p.add(OP_deref)
self.measure(p, sp + 1, fv.Type.V, startpc)
p.add(OP_drop_state)
j := p.pc()
p.add(OP_goto)
p.pin(i)
p.i64(OP_size_const, 4)
p.pin(j)
}
func (self *Compiler) measureStructIterable(p *Program, sp int, fv defs.Field, startpc int) {
i := p.pc()
p.add(OP_if_nil)
p.i64(OP_size_const, 3)
self.measure(p, sp, fv.Type, startpc)
p.pin(i)
}
func (self *Compiler) measureStructOptional(p *Program, sp int, fv defs.Field, startpc int) {
i := p.pc()
p.add(OP_if_nil)
p.i64(OP_size_const, 3)
p.add(OP_make_state)
p.add(OP_deref)
self.measure(p, sp + 1, fv.Type.V, startpc)
p.add(OP_drop_state)
p.pin(i)
}
func (self *Compiler) measureStructRequired(p *Program, sp int, fv defs.Field, startpc int) {
p.i64(OP_size_const, 3)
self.measure(p, sp, fv.Type, startpc)
}