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write.go
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write.go
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// Copyright 2017 Istio Authors
//
// 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 text
import (
"bytes"
"fmt"
"sort"
"istio.io/istio/mixer/pkg/il"
)
// WriteText writes the program in the textual assembly form and returns it as string.
func WriteText(p *il.Program) string {
var b bytes.Buffer
names := p.Functions.Names()
sort.Strings(names)
for _, name := range names {
f := p.Functions.Get(name)
WriteFn(&b, p.ByteCode(), f, p.Strings(), 0)
b.WriteString("\n")
}
return b.String()
}
// WriteFn writes the given function to the given byte-buffer, as string.
// If the tag parameter is non-zero, a comment-based tag is also printed next to the op-code at
// the index indicated by tag.
func WriteFn(b *bytes.Buffer, code []uint32, f *il.Function, strings *il.StringTable, tag uint32) {
// First, scan jump destination addresses, to calculate where the labels that needs to be placed.
var labels = make(map[uint32]int)
id := 0
for i := f.Address; i < f.Address+f.Length; i++ {
op := il.Opcode(code[i])
for _, arg := range op.Args() {
i++
adr := code[i]
if arg == il.OpcodeArgAddress {
_, e := labels[adr]
if !e {
labels[adr] = id
id++
}
}
}
}
b.WriteString("fn ")
b.WriteString(strings.GetString(f.ID))
b.WriteString("(")
for i, p := range f.Parameters {
if i > 0 {
b.WriteString(" ")
}
b.WriteString(fmt.Sprintf("%v", p))
}
b.WriteString(") ")
b.WriteString(f.ReturnType.String())
b.WriteString("\n")
for i := f.Address; i < f.Address+f.Length; i++ {
labelID, exists := labels[i]
if exists {
b.WriteString(fmt.Sprintf("L%d:\n", labelID))
}
opIndex := i
op := il.Opcode(code[i])
b.WriteString(" ")
b.WriteString(op.Keyword())
for _, arg := range op.Args() {
b.WriteString(" ")
i++
val := code[i]
switch arg {
case il.OpcodeArgString:
str := strings.GetString(val)
str = escape(str)
b.WriteString("\"")
b.WriteString(str)
b.WriteString("\"")
case il.OpcodeArgAddress:
b.WriteString(fmt.Sprintf("L%d", labels[val]))
case il.OpcodeArgFunction:
str := strings.GetString(val)
b.WriteString(str)
case il.OpcodeArgRegister:
b.WriteString(fmt.Sprintf("r%d", val))
case il.OpcodeArgInt:
i++
val2 := code[i]
b.WriteString(fmt.Sprintf("%d", il.ByteCodeToInteger(val, val2)))
case il.OpcodeArgDouble:
i++
val2 := code[i]
fl := il.ByteCodeToDouble(val, val2)
b.WriteString(fmt.Sprintf("%f", fl))
case il.OpcodeArgBool:
if il.ByteCodeToBool(val) {
b.WriteString("true")
} else {
b.WriteString("false")
}
default:
panic(fmt.Errorf("unknown arg type: %v", arg))
}
}
if tag != 0 && tag == opIndex {
b.WriteString(" // <<<<")
}
b.WriteString("\n")
}
b.WriteString("end\n")
}