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assembly.go
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assembly.go
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// Copyright (c) 2021 Timo Savola. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ga
import (
"bytes"
"fmt"
"strings"
)
const header1 = `// Generated by gate.computer/ga, DO NOT EDIT!
`
const header2 = `
.section .note.GNU-stack,"",%progbits
.section .text
`
type Cond uint8
const (
EQ Cond = iota
NE
LT
LE
GT
GE
)
type Shift uint8
const (
Left Shift = iota
RightLogical
RightArithmetic
)
type FloatReg uint8
func global(name string) bool {
return !strings.HasPrefix(name, ".")
}
func symbol(name string) string {
if !global(name) {
name = strings.Replace(name, ".", ".L", 1)
}
return fmt.Sprintf("%q", name)
}
type Assembly struct {
Arch
ArchAssembly
*System
*buffer
}
func NewAssembly(arch Arch, sys *System) *Assembly {
buf := new(buffer)
a := &Assembly{
Arch: arch,
ArchAssembly: arch.newAssembly(sys, buf),
System: sys,
buffer: buf,
}
a.Reset()
return a
}
func (a *Assembly) Reset(regs ...Reg) {
for i := range a.regUsage {
a.regUsage[i] = ""
}
for _, r := range regs {
a.Set(r)
}
a.Set(a.StackPtr)
}
func (a *Assembly) Bytes() []byte {
return a.buffer.Bytes()
}
func (a *Assembly) String() string {
return a.buffer.String()
}
type ArchAssembly interface {
Set(Reg)
Label(name string)
FunctionEpilogue()
Function(name string)
FunctionWithoutPrologue(name string)
Return()
ReturnWithoutEpilogue()
Address(dest Reg, name string)
MoveDef(dest Reg, name string)
MoveImm(dest Reg, value int)
MoveImm64(dest Reg, value uint64)
MoveReg(dest, src Reg)
MoveRegFloat(dest Reg, src FloatReg)
AddImm(dest, src Reg, value int)
AddReg(dest, src1, src2 Reg)
SubtractImm(dest Reg, value int)
SubtractReg(dest, src Reg)
MultiplyImm(dest, src Reg, value int, temp Reg)
AndImm(dest Reg, value int)
AndReg(dest, src Reg)
OrImm(dest Reg, value int)
OrReg(dest, src Reg)
ShiftImm(s Shift, r Reg, count int)
Load(dest, base Reg, offset int)
Load4Bytes(dest, base Reg, offset int)
LoadByte(dest, base Reg, offset int)
Store(base Reg, offset int, src Reg)
Store4Bytes(base Reg, offset int, src Reg)
Push(Reg)
Pop(Reg)
Call(name string)
Jump(name string)
JumpRegRoutine(r Reg, internalNamePrefix string)
JumpIfBitSet(r Reg, bit uint, name string)
JumpIfBitNotSet(r Reg, bit uint, name string)
JumpIfImm(c Cond, r Reg, value int, name string)
JumpIfReg(c Cond, dest, src Reg, name string)
Syscall(Syscall)
Unreachable()
}
type buffer struct {
bytes.Buffer
regUsage [32]string
}
func (b *buffer) checkUsage(reg uint8, use string) {
switch existing := b.regUsage[reg]; existing {
case use:
case "":
panic(fmt.Sprintf("register #%d (%s) not in use", reg, use))
default:
panic(fmt.Sprintf("existing register #%d (%s) usage: %s", reg, use, existing))
}
}
func (b *buffer) label(name string) {
b.printf("%s:", symbol(name))
}
func (b *buffer) insn(mnemonic string, operands ...string) {
b.WriteString("\t" + mnemonic)
for i, field := range operands {
switch i {
case 0:
b.WriteString("\t")
default:
b.WriteString(", ")
}
b.WriteString(field)
}
fmt.Fprintln(&b.Buffer)
}
func (b *buffer) insnf(format string, args ...interface{}) {
for i, field := range strings.Fields(fmt.Sprintf(format, args...)) {
switch i {
case 0, 1:
b.WriteString("\t")
default:
b.WriteString(" ")
}
b.WriteString(field)
}
fmt.Fprintln(&b.Buffer)
}
func (b *buffer) printf(format string, args ...interface{}) {
for i, field := range strings.Fields(fmt.Sprintf(format, args...)) {
switch i {
case 0:
case 1:
b.WriteString("\t")
default:
b.WriteString(" ")
}
b.WriteString(field)
}
fmt.Fprintln(&b.Buffer)
}