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assembler.go
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assembler.go
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// Copyright (C) 2019-2024 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package logic
import (
"bufio"
"bytes"
"crypto/sha512"
"encoding/base32"
"encoding/base64"
"encoding/binary"
"encoding/hex"
"errors"
"fmt"
"io"
"math"
"sort"
"strconv"
"strings"
"unicode"
"github.com/algorand/avm-abi/abi"
"github.com/algorand/go-algorand/data/basics"
)
// optimizeConstantsEnabledVersion is the first version of TEAL where the
// assembler optimizes constants introduced by pseudo-ops
const optimizeConstantsEnabledVersion = 4
// Writer is what we want here. Satisfied by bufio.Buffer
type Writer interface {
Write([]byte) (int, error)
WriteByte(c byte) error
}
type labelReference struct {
// position (PC) of the label reference
position int
// token holding the label name (and line, column)
label token
// ending position of the opcode containing the label reference.
offsetPosition int
}
type constReference interface {
// get the referenced value
getValue() interface{}
// check if the referenced value equals other. Other must be the same type
valueEquals(other interface{}) bool
// get the index into ops.pending where the opcode for this reference is located
getPosition() int
// get the length of the op for this reference in ops.pending
length(ops *OpStream, assembled []byte) (int, error)
// create the opcode bytes for a new reference of the same value
makeNewReference(ops *OpStream, singleton bool, newIndex int) []byte
}
type intReference struct {
value uint64
// position of the opcode start that declares the int value
position int
}
func (ref intReference) getValue() interface{} {
return ref.value
}
func (ref intReference) valueEquals(other interface{}) bool {
return ref.value == other.(uint64)
}
func (ref intReference) getPosition() int {
return ref.position
}
func (ref intReference) length(ops *OpStream, assembled []byte) (int, error) {
opIntc0 := OpsByName[ops.Version]["intc_0"].Opcode
opIntc1 := OpsByName[ops.Version]["intc_1"].Opcode
opIntc2 := OpsByName[ops.Version]["intc_2"].Opcode
opIntc3 := OpsByName[ops.Version]["intc_3"].Opcode
opIntc := OpsByName[ops.Version]["intc"].Opcode
switch assembled[ref.position] {
case opIntc0, opIntc1, opIntc2, opIntc3:
return 1, nil
case opIntc:
return 2, nil
default:
return 0, sourceErrorf(ops.OffsetToSource[ref.position], "unexpected op at intReference: %d", assembled[ref.position])
}
}
func (ref intReference) makeNewReference(ops *OpStream, singleton bool, newIndex int) []byte {
opIntc0 := OpsByName[ops.Version]["intc_0"].Opcode
opIntc1 := OpsByName[ops.Version]["intc_1"].Opcode
opIntc2 := OpsByName[ops.Version]["intc_2"].Opcode
opIntc3 := OpsByName[ops.Version]["intc_3"].Opcode
opIntc := OpsByName[ops.Version]["intc"].Opcode
opPushInt := OpsByName[ops.Version]["pushint"].Opcode
if singleton {
var scratch [binary.MaxVarintLen64]byte
vlen := binary.PutUvarint(scratch[:], ref.value)
newBytes := make([]byte, 1+vlen)
newBytes[0] = opPushInt
copy(newBytes[1:], scratch[:vlen])
return newBytes
}
switch newIndex {
case 0:
return []byte{opIntc0}
case 1:
return []byte{opIntc1}
case 2:
return []byte{opIntc2}
case 3:
return []byte{opIntc3}
default:
return []byte{opIntc, uint8(newIndex)}
}
}
type byteReference struct {
value []byte
// position of the opcode start that declares the byte value
position int
}
func (ref byteReference) getValue() interface{} {
return ref.value
}
func (ref byteReference) valueEquals(other interface{}) bool {
return bytes.Equal(ref.value, other.([]byte))
}
func (ref byteReference) getPosition() int {
return ref.position
}
func (ref byteReference) length(ops *OpStream, assembled []byte) (int, error) {
opBytec0 := OpsByName[ops.Version]["bytec_0"].Opcode
opBytec1 := OpsByName[ops.Version]["bytec_1"].Opcode
opBytec2 := OpsByName[ops.Version]["bytec_2"].Opcode
opBytec3 := OpsByName[ops.Version]["bytec_3"].Opcode
opBytec := OpsByName[ops.Version]["bytec"].Opcode
switch assembled[ref.position] {
case opBytec0, opBytec1, opBytec2, opBytec3:
return 1, nil
case opBytec:
return 2, nil
default:
return 0, sourceErrorf(ops.OffsetToSource[ref.position], "unexpected op at byteReference: %d", assembled[ref.position])
}
}
func (ref byteReference) makeNewReference(ops *OpStream, singleton bool, newIndex int) []byte {
opBytec0 := OpsByName[ops.Version]["bytec_0"].Opcode
opBytec1 := OpsByName[ops.Version]["bytec_1"].Opcode
opBytec2 := OpsByName[ops.Version]["bytec_2"].Opcode
opBytec3 := OpsByName[ops.Version]["bytec_3"].Opcode
opBytec := OpsByName[ops.Version]["bytec"].Opcode
opPushBytes := OpsByName[ops.Version]["pushbytes"].Opcode
if singleton {
var scratch [binary.MaxVarintLen64]byte
vlen := binary.PutUvarint(scratch[:], uint64(len(ref.value)))
newBytes := make([]byte, 1+vlen+len(ref.value))
newBytes[0] = opPushBytes
copy(newBytes[1:], scratch[:vlen])
copy(newBytes[1+vlen:], ref.value)
return newBytes
}
switch newIndex {
case 0:
return []byte{opBytec0}
case 1:
return []byte{opBytec1}
case 2:
return []byte{opBytec2}
case 3:
return []byte{opBytec3}
default:
return []byte{opBytec, uint8(newIndex)}
}
}
// SourceLocation points to a specific location in a source file.
type SourceLocation struct {
// Line is the line number, starting at 0.
Line int
// Column is the column number, starting at 0.
Column int
}
// OpStream accumulates state, including the final program, during assembly.
type OpStream struct {
Version uint64
Trace *strings.Builder
Warnings []sourceError // informational warnings, shouldn't stop assembly
Errors []sourceError // errors that should prevent final assembly
Program []byte // Final program bytes. Will stay nil if any errors
// Running bytes as they are assembled. jumps must be resolved
// and cblocks added before these bytes become a legal program.
pending bytes.Buffer
intc []uint64 // observed ints in code. We'll put them into a intcblock
intcRefs []intReference // references to int pseudo-op constants, used for optimization
cntIntcBlock int // prevent prepending intcblock because asm has one
hasPseudoInt bool // were any `int` pseudo ops used?
bytec [][]byte // observed bytes in code. We'll put them into a bytecblock
bytecRefs []byteReference // references to byte/addr pseudo-op constants, used for optimization
cntBytecBlock int // prevent prepending bytecblock because asm has one
hasPseudoByte bool // were any `byte` (or equivalent) pseudo ops used?
// tracks information we know to be true at the point being assembled
known ProgramKnowledge
typeTracking bool
// current sourceLine during assembly
sourceLine int
// map label string to position within pending buffer
labels map[string]int
// track references in order to patch in jump offsets
labelReferences []labelReference
// map opcode offsets to source location
OffsetToSource map[int]SourceLocation
HasStatefulOps bool
// Need new copy for each opstream
versionedPseudoOps map[string]map[int]OpSpec
macros map[string][]token
}
// newOpStream constructs OpStream instances ready to invoke assemble. A new
// OpStream must be used for each call to assemble().
func newOpStream(version uint64) OpStream {
o := OpStream{
labels: make(map[string]int),
OffsetToSource: make(map[int]SourceLocation),
typeTracking: true,
Version: version,
macros: make(map[string][]token),
known: ProgramKnowledge{fp: -1},
}
for i := range o.known.scratchSpace {
o.known.scratchSpace[i] = StackZeroUint64
}
return o
}
// ProgramKnowledge tracks statically known information as we assemble
type ProgramKnowledge struct {
// list of the types known to be on the value stack, based on specs of
// opcodes seen while assembling. In normal code, the tip of the stack must
// match the next opcode's Arg.Types, and is then replaced with its
// Return.Types. If `deadcode` is true, `stack` should be empty.
stack StackTypes
// bottom is the type given out when `stack` is empty. It is StackNone at
// program start, so, for example, a `+` opcode at the start of a program
// fails. But when a label or callsub is encountered, `stack` is truncated
// and `bottom` becomes StackAny, because we don't track program state
// coming in from elsewhere. A `+` after a label succeeds, because the stack
// "virtually" contains an infinite list of StackAny.
bottom StackType
// deadcode indicates that the program is in deadcode, so no type checking
// errors should be reported.
deadcode bool
// fp is the frame pointer, if known/usable, or -1 if not. When
// encountering a `proto`, `stack` is grown to fit `args`, and this `fp` is
// set to the top of those args. This may not be the "real" fp when the
// program is actually evaluated, but it is good enough for frame_{dig/bury}
// to work from there.
fp int
scratchSpace [256]StackType
}
func (pgm *ProgramKnowledge) top() (StackType, bool) {
if len(pgm.stack) == 0 {
return pgm.bottom, pgm.bottom.AVMType != avmNone
}
last := len(pgm.stack) - 1
return pgm.stack[last], true
}
func (pgm *ProgramKnowledge) pop() StackType {
if len(pgm.stack) == 0 {
return pgm.bottom
}
last := len(pgm.stack) - 1
t := pgm.stack[last]
pgm.stack = pgm.stack[:last]
return t
}
func (pgm *ProgramKnowledge) push(types ...StackType) {
pgm.stack = append(pgm.stack, types...)
}
func (pgm *ProgramKnowledge) deaden() {
pgm.stack = pgm.stack[:0]
pgm.deadcode = true
}
// label resets knowledge to reflect that control may enter from elsewhere.
func (pgm *ProgramKnowledge) label() {
if pgm.deadcode {
pgm.reset()
}
}
// reset clears existing knowledge and permissively allows any stack value. It's intended to be invoked after encountering a label or pragma type tracking change.
func (pgm *ProgramKnowledge) reset() {
pgm.stack = nil
pgm.bottom = StackAny
pgm.fp = -1
pgm.deadcode = false
for i := range pgm.scratchSpace {
pgm.scratchSpace[i] = StackAny
}
}
// createLabel inserts a label to point to the next instruction, reporting an
// error for a duplicate.
func (ops *OpStream) createLabel(withColon token) {
label := strings.TrimSuffix(withColon.str, ":")
if _, ok := ops.labels[label]; ok {
ops.record(withColon.errorf("duplicate label %#v", label))
}
ops.labels[label] = ops.pending.Len()
ops.known.label()
}
// recordSourceLocation adds an entry to pc to source location mapping
func (ops *OpStream) recordSourceLocation(line, column int) {
ops.OffsetToSource[ops.pending.Len()] = SourceLocation{line - 1, column}
}
// referToLabel records an opcode label reference to resolve later
func (ops *OpStream) referToLabel(pc int, label token, offsetPosition int) {
ops.labelReferences = append(ops.labelReferences, labelReference{pc, label, offsetPosition})
}
type refineFunc func(pgm *ProgramKnowledge, immediates []token) (StackTypes, StackTypes, error)
// returns allows opcodes like `txn` to be specific about their return value
// types, based on the field requested, rather than use Any as specified by
// opSpec. It replaces StackAny in the top `count` elements of the typestack.
func (ops *OpStream) returns(spec *OpSpec, replacement StackType) {
if ops.known.deadcode {
return
}
end := len(ops.known.stack)
tip := ops.known.stack[end-len(spec.Return.Types):]
for i := range tip {
if tip[i].AVMType == avmAny {
tip[i] = replacement
return
}
}
panic(fmt.Sprintf("returns was called on OpSpec '%s' without StackAny %+v in spec.Return",
spec.Name, spec.Return))
}
// writeIntc writes opcodes for loading a uint64 constant onto the stack.
func (ops *OpStream) writeIntc(constIndex uint) error {
switch constIndex {
case 0:
ops.pending.WriteByte(OpsByName[ops.Version]["intc_0"].Opcode)
case 1:
ops.pending.WriteByte(OpsByName[ops.Version]["intc_1"].Opcode)
case 2:
ops.pending.WriteByte(OpsByName[ops.Version]["intc_2"].Opcode)
case 3:
ops.pending.WriteByte(OpsByName[ops.Version]["intc_3"].Opcode)
default:
if constIndex > 0xff {
return errors.New("cannot have more than 256 int constants")
}
ops.pending.WriteByte(OpsByName[ops.Version]["intc"].Opcode)
ops.pending.WriteByte(uint8(constIndex))
}
if constIndex >= uint(len(ops.intc)) {
return fmt.Errorf("intc %d is not defined", constIndex)
}
ops.trace("intc %d: %d", constIndex, ops.intc[constIndex])
return nil
}
// intLiteral writes opcodes for loading a uint literal
func (ops *OpStream) intLiteral(val uint64) error {
ops.hasPseudoInt = true
found := false
var constIndex uint
for i, cv := range ops.intc {
if cv == val {
constIndex = uint(i)
found = true
break
}
}
if !found {
if ops.cntIntcBlock > 0 {
return fmt.Errorf("value %d does not appear in existing intcblock", val)
}
constIndex = uint(len(ops.intc))
ops.intc = append(ops.intc, val)
}
ops.intcRefs = append(ops.intcRefs, intReference{
value: val,
position: ops.pending.Len(),
})
return ops.writeIntc(constIndex)
}
// writeBytec writes opcodes for loading a []byte constant onto the stack.
func (ops *OpStream) writeBytec(constIndex uint) error {
switch constIndex {
case 0:
ops.pending.WriteByte(OpsByName[ops.Version]["bytec_0"].Opcode)
case 1:
ops.pending.WriteByte(OpsByName[ops.Version]["bytec_1"].Opcode)
case 2:
ops.pending.WriteByte(OpsByName[ops.Version]["bytec_2"].Opcode)
case 3:
ops.pending.WriteByte(OpsByName[ops.Version]["bytec_3"].Opcode)
default:
if constIndex > 0xff {
return errors.New("cannot have more than 256 byte constants")
}
ops.pending.WriteByte(OpsByName[ops.Version]["bytec"].Opcode)
ops.pending.WriteByte(uint8(constIndex))
}
if constIndex >= uint(len(ops.bytec)) {
return fmt.Errorf("bytec %d is not defined", constIndex)
}
ops.trace("bytec %d %s", constIndex, hex.EncodeToString(ops.bytec[constIndex]))
return nil
}
// byteLiteral writes opcodes and data for loading a []byte literal
// Values are accumulated so that they can be put into a bytecblock
func (ops *OpStream) byteLiteral(val []byte) error {
ops.hasPseudoByte = true
found := false
var constIndex uint
for i, cv := range ops.bytec {
if bytes.Equal(cv, val) {
found = true
constIndex = uint(i)
break
}
}
if !found {
if ops.cntBytecBlock > 0 {
return fmt.Errorf("value 0x%x does not appear in existing bytecblock", val)
}
constIndex = uint(len(ops.bytec))
ops.bytec = append(ops.bytec, val)
}
ops.bytecRefs = append(ops.bytecRefs, byteReference{
value: val,
position: ops.pending.Len(),
})
return ops.writeBytec(constIndex)
}
func asmInt(ops *OpStream, spec *OpSpec, mnemonic token, args []token) *sourceError {
if err := ops.checkArgCount(spec.Name, mnemonic, args, 1); err != nil {
return err
}
// After backBranchEnabledVersion, control flow is confusing, so if there's
// a manual cblock, use push instead of trying to use what's given.
if ops.cntIntcBlock > 0 && ops.Version >= backBranchEnabledVersion {
// We don't understand control-flow, so use pushint
ops.warn(args[0], "int %s used with explicit intcblock. must pushint", args[0].str)
pushint := OpsByName[ops.Version]["pushint"]
return asmPushInt(ops, &pushint, mnemonic, args)
}
// There are no backjumps, but there are multiple cblocks. Maybe one is
// conditional skipped. Too confusing.
if ops.cntIntcBlock > 1 {
pushint, ok := OpsByName[ops.Version]["pushint"]
if ok {
return asmPushInt(ops, &pushint, mnemonic, args)
}
return mnemonic.errorf("int %s used with manual intcblocks. Use intc.", args[0].str)
}
// In both of the above clauses, we _could_ track whether a particular
// intcblock dominates the current instruction. If so, we could use it.
// check txn type constants
i, ok := txnTypeMap[args[0].str]
if !ok {
// check OnCompletion constants
i, ok = onCompletionMap[args[0].str]
}
if !ok {
val, err := strconv.ParseUint(args[0].str, 0, 64)
if err != nil {
return args[0].errorf("unable to parse %#v as integer", args[0].str)
}
i = val
}
err := ops.intLiteral(i)
if err != nil {
return args[0].error(err)
}
return nil
}
// Explicit invocation of const lookup and push
func asmIntC(ops *OpStream, spec *OpSpec, mnemonic token, args []token) *sourceError {
if err := ops.checkArgCount(spec.Name, mnemonic, args, 1); err != nil {
return err
}
constIndex, err := byteImm(args[0].str, "constant")
if err != nil {
return args[0].error(err)
}
err = ops.writeIntc(uint(constIndex))
if err != nil {
return args[0].error(err)
}
return nil
}
func asmByteC(ops *OpStream, spec *OpSpec, mnemonic token, args []token) *sourceError {
if err := ops.checkArgCount(spec.Name, mnemonic, args, 1); err != nil {
return err
}
constIndex, err := byteImm(args[0].str, "constant")
if err != nil {
return args[0].error(err)
}
err = ops.writeBytec(uint(constIndex))
if err != nil {
return args[0].error(err)
}
return nil
}
func asmPushInt(ops *OpStream, spec *OpSpec, mnemonic token, args []token) *sourceError {
if err := ops.checkArgCount(spec.Name, mnemonic, args, 1); err != nil {
return err
}
val, err := strconv.ParseUint(args[0].str, 0, 64)
if err != nil {
return args[0].errorf("unable to parse %#v as integer", args[0].str)
}
ops.pending.WriteByte(spec.Opcode)
var scratch [binary.MaxVarintLen64]byte
vlen := binary.PutUvarint(scratch[:], val)
ops.pending.Write(scratch[:vlen])
return nil
}
func asmPushInts(ops *OpStream, spec *OpSpec, mnemonic token, args []token) *sourceError {
ops.pending.WriteByte(spec.Opcode)
asmIntImmArgs(ops, args)
return nil
}
func asmPushBytes(ops *OpStream, spec *OpSpec, mnemonic token, args []token) *sourceError {
// asmPushBytes is sometimes used to assemble the "byte" mnemonic, so use
// mnemonic.str instead of spec.Name when reporting errors.
if len(args) == 0 {
return mnemonic.errorAfterf("%s needs byte literal argument", mnemonic.str)
}
val, consumed, err := parseBinaryArgs(args)
if err != nil {
return args[consumed].errorf("%s %w", mnemonic.str, err)
}
if len(args) != consumed {
return args[consumed].errorf("%s with extraneous argument", mnemonic.str)
}
ops.pending.WriteByte(spec.Opcode)
var scratch [binary.MaxVarintLen64]byte
vlen := binary.PutUvarint(scratch[:], uint64(len(val)))
ops.pending.Write(scratch[:vlen])
ops.pending.Write(val)
return nil
}
func asmPushBytess(ops *OpStream, spec *OpSpec, mnemonic token, args []token) *sourceError {
ops.pending.WriteByte(spec.Opcode)
_, err := asmByteImmArgs(ops, spec, args)
return err
}
func base32DecodeAnyPadding(x string) (val []byte, err error) {
val, err = base32.StdEncoding.WithPadding(base32.NoPadding).DecodeString(x)
if err != nil {
// try again with standard padding
var e2 error
val, e2 = base32.StdEncoding.DecodeString(x)
if e2 == nil {
err = nil
}
}
return
}
// parseBinaryArgs parses a byte literal argument. It returns the argument,
// interpetted into raw bytes, and the number of tokens consumed.
func parseBinaryArgs(args []token) ([]byte, int, error) {
arg := args[0].str
if strings.HasPrefix(arg, "base32(") || strings.HasPrefix(arg, "b32(") {
open := strings.IndexRune(arg, '(')
close := strings.IndexRune(arg, ')')
if close == -1 {
return nil, 0, fmt.Errorf("argument %s lacks closing parenthesis", arg)
}
if close != len(arg)-1 {
return nil, 0, fmt.Errorf("argument %s must end at first closing parenthesis", arg)
}
val, err := base32DecodeAnyPadding(arg[open+1 : close])
if err != nil {
if cie, ok := err.(base32.CorruptInputError); ok {
return nil, 0, base32.CorruptInputError(int64(cie) + int64(open) + 1)
}
return nil, 0, err
}
return val, 1, nil
} else if strings.HasPrefix(arg, "base64(") || strings.HasPrefix(arg, "b64(") {
open := strings.IndexRune(arg, '(')
close := strings.IndexRune(arg, ')')
if close == -1 {
return nil, 0, fmt.Errorf("argument %s lacks closing parenthesis", arg)
}
if close != len(arg)-1 {
return nil, 0, fmt.Errorf("argument %s must end at first closing parenthesis", arg)
}
val, err := base64.StdEncoding.DecodeString(arg[open+1 : close])
if err != nil {
if cie, ok := err.(base64.CorruptInputError); ok {
return nil, 0, base64.CorruptInputError(int64(cie) + int64(open) + 1)
}
return nil, 0, err
}
return val, 1, nil
} else if strings.HasPrefix(arg, "0x") {
val, err := hex.DecodeString(arg[2:])
if err != nil {
return nil, 0, err
}
return val, 1, nil
} else if arg == "base32" || arg == "b32" {
if len(args) < 2 {
return nil, 0, fmt.Errorf("%s needs byte literal argument", arg)
}
val, err := base32DecodeAnyPadding(args[1].str)
if err != nil {
return nil, 1, err // return 1, so that the right token is blamed
}
return val, 2, nil
} else if arg == "base64" || arg == "b64" {
if len(args) < 2 {
return nil, 0, fmt.Errorf("%s needs byte literal argument", arg)
}
val, err := base64.StdEncoding.DecodeString(args[1].str)
if err != nil {
return nil, 1, err
}
return val, 2, nil
} else if len(arg) > 1 && arg[0] == '"' && arg[len(arg)-1] == '"' {
val, err := parseStringLiteral(arg)
if err != nil {
return nil, 0, err
}
return val, 1, err
}
return nil, 0, fmt.Errorf("arg did not parse: %v", arg)
}
func parseStringLiteral(input string) (result []byte, err error) {
start := 0
end := len(input) - 1
if input[start] != '"' || input[end] != '"' {
return nil, fmt.Errorf("no quotes")
}
start++
escapeSeq := false
hexSeq := false
result = make([]byte, 0, end-start+1)
// skip first and last quotes
pos := start
for pos < end {
char := input[pos]
if char == '\\' && !escapeSeq {
if hexSeq {
return nil, fmt.Errorf("escape sequence inside hex number")
}
escapeSeq = true
pos++
continue
}
if escapeSeq {
escapeSeq = false
switch char {
case 'n':
char = '\n'
case 'r':
char = '\r'
case 't':
char = '\t'
case '\\':
char = '\\'
case '"':
char = '"'
case 'x':
hexSeq = true
pos++
continue
default:
return nil, fmt.Errorf("invalid escape sequence \\%c", char)
}
}
if hexSeq {
hexSeq = false
if pos >= len(input)-2 { // count a closing quote
return nil, fmt.Errorf("non-terminated hex sequence")
}
num, err := strconv.ParseUint(input[pos:pos+2], 16, 8)
if err != nil {
return nil, err
}
char = uint8(num)
pos++
}
result = append(result, char)
pos++
}
if escapeSeq || hexSeq {
return nil, fmt.Errorf("non-terminated escape sequence")
}
return
}
// byte {base64,b64,base32,b32}(...)
// byte {base64,b64,base32,b32} ...
// byte 0x....
// byte "this is a string\n"
func asmByte(ops *OpStream, spec *OpSpec, mnemonic token, args []token) *sourceError {
if len(args) == 0 {
return mnemonic.errorAfterf("%s needs byte literal argument", spec.Name)
}
// After backBranchEnabledVersion, control flow is confusing, so if there's
// a manual cblock, use push instead of trying to use what's given.
if ops.cntBytecBlock > 0 && ops.Version >= backBranchEnabledVersion {
// We don't understand control-flow, so use pushbytes
ops.warn(args[0], "byte %s used with explicit bytecblock. must pushbytes", args[0].str)
pushbytes := OpsByName[ops.Version]["pushbytes"] // make sure pushbytes opcode is written
return asmPushBytes(ops, &pushbytes, mnemonic, args)
}
// There are no backjumps, but there are multiple cblocks. Maybe one is
// conditional skipped. Too confusing.
if ops.cntBytecBlock > 1 {
// use pushbytes opcode if available
pushbytes, ok := OpsByName[ops.Version]["pushbytes"]
if ok {
return asmPushBytes(ops, &pushbytes, mnemonic, args)
}
return args[0].errorf("byte %s used with manual bytecblocks. Use bytec.", args[0].str)
}
// In both of the above clauses, we _could_ track whether a particular
// bytecblock dominates the current instruction. If so, we could use it.
val, consumed, err := parseBinaryArgs(args)
if err != nil {
return args[consumed].errorf("%s %w", spec.Name, err)
}
if len(args) != consumed {
return args[consumed].errorf("%s with extraneous argument", spec.Name)
}
err = ops.byteLiteral(val)
if err != nil {
return args[0].error(err)
}
return nil
}
// method "add(uint64,uint64)uint64"
func asmMethod(ops *OpStream, spec *OpSpec, mnemonic token, args []token) *sourceError {
if err := ops.checkArgCount(spec.Name, mnemonic, args, 1); err != nil {
return err
}
arg := args[0].str
if len(arg) > 1 && arg[0] == '"' && arg[len(arg)-1] == '"' {
methodSig, err := parseStringLiteral(arg)
if err != nil {
return args[0].error(err)
}
methodSigStr := string(methodSig)
err = abi.VerifyMethodSignature(methodSigStr)
if err != nil {
// Warn if an invalid signature is used. Don't return an error, since the ABI is not
// governed by the core protocol, so there may be changes to it that we don't know about
ops.warn(args[0], "invalid ARC-4 ABI method signature for method op: %w", err)
}
hash := sha512.Sum512_256(methodSig)
err = ops.byteLiteral(hash[:4])
if err != nil {
return args[0].error(err)
}
return nil
}
return args[0].errorf("unable to parse method signature")
}
func asmIntImmArgs(ops *OpStream, args []token) []uint64 {
ivals := make([]uint64, len(args))
var scratch [binary.MaxVarintLen64]byte
l := binary.PutUvarint(scratch[:], uint64(len(args)))
ops.pending.Write(scratch[:l])
for i, xs := range args {
cu, err := strconv.ParseUint(xs.str, 0, 64)
if err != nil {
ops.record(xs.error(err))
}
l = binary.PutUvarint(scratch[:], cu)
ops.pending.Write(scratch[:l])
ivals[i] = cu
}
return ivals
}
func asmIntCBlock(ops *OpStream, spec *OpSpec, mnemonic token, args []token) *sourceError {
ops.pending.WriteByte(spec.Opcode)
ivals := asmIntImmArgs(ops, args)
if !ops.known.deadcode {
// If we previously processed an `int`, we thought we could insert our
// own intcblock, but now we see a manual one.
if ops.hasPseudoInt {
return mnemonic.errorf("intcblock following int")
}
ops.intcRefs = nil
ops.intc = ivals
ops.cntIntcBlock++
}
return nil
}
func asmByteImmArgs(ops *OpStream, spec *OpSpec, args []token) ([][]byte, *sourceError) {
bvals := make([][]byte, 0, len(args))
rest := args
for len(rest) > 0 {
val, consumed, err := parseBinaryArgs(rest)
if err != nil {
// Would be nice to keep going, as in asmIntImmArgs, but
// parseBinaryArgs would have to return a useful consumed value even
// in the face of errors. Hard.
return nil, rest[0].errorf("%s %w", spec.Name, err)
}
bvals = append(bvals, val)
rest = rest[consumed:]
}
var scratch [binary.MaxVarintLen64]byte
l := binary.PutUvarint(scratch[:], uint64(len(bvals)))
ops.pending.Write(scratch[:l])
for _, bv := range bvals {
l := binary.PutUvarint(scratch[:], uint64(len(bv)))
ops.pending.Write(scratch[:l])
ops.pending.Write(bv)
}
return bvals, nil
}
func asmByteCBlock(ops *OpStream, spec *OpSpec, mnemonic token, args []token) *sourceError {
ops.pending.WriteByte(spec.Opcode)
bvals, err := asmByteImmArgs(ops, spec, args)
if err != nil {
return err
}
if !ops.known.deadcode {
// If we previously processed a pseudo `byte`, we thought we could
// insert our own bytecblock, but now we see a manual one.
if ops.hasPseudoByte {
return mnemonic.errorf("bytecblock following byte/addr/method")
}
ops.bytecRefs = nil
ops.bytec = bvals
ops.cntBytecBlock++
}
return nil
}
// addr A1EU...
// parses base32-with-checksum account address strings into a byte literal
func asmAddr(ops *OpStream, spec *OpSpec, mnemonic token, args []token) *sourceError {
if err := ops.checkArgCount(spec.Name, mnemonic, args, 1); err != nil {
return err
}
addr, err := basics.UnmarshalChecksumAddress(args[0].str)
if err != nil {
return args[0].error(err)
}
err = ops.byteLiteral(addr[:])
if err != nil {
return args[0].error(err)
}
return nil
}
func asmArg(ops *OpStream, spec *OpSpec, mnemonic token, args []token) *sourceError {
if err := ops.checkArgCount(spec.Name, mnemonic, args, 1); err != nil {
return err
}
val, err := byteImm(args[0].str, "argument")
if err != nil {
return args[0].error(err)
}
altSpec := *spec
if val < 4 {
switch val {
case 0:
altSpec = OpsByName[ops.Version]["arg_0"]
case 1:
altSpec = OpsByName[ops.Version]["arg_1"]
case 2:
altSpec = OpsByName[ops.Version]["arg_2"]
case 3:
altSpec = OpsByName[ops.Version]["arg_3"]
}
args = []token{}
}
return asmDefault(ops, &altSpec, mnemonic, args)
}
func asmBranch(ops *OpStream, spec *OpSpec, mnemonic token, args []token) *sourceError {
if err := ops.checkArgCount(spec.Name, mnemonic, args, 1); err != nil {
return err
}
ops.referToLabel(ops.pending.Len()+1, args[0], ops.pending.Len()+spec.Size)
ops.pending.WriteByte(spec.Opcode)
// zero bytes will get replaced with actual offset in resolveLabels()
ops.pending.WriteByte(0)
ops.pending.WriteByte(0)
return nil
}