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package compiler
//go:generate go run golang.org/x/tools/cmd/stringer@v0.10.0 -type=Opcode,AugOp,BuiltinOp
// Opcode represents a single virtual machine instruction (or argument). The
// comments beside each opcode show any arguments that instruction consumes.
//
// Normally this is called "bytecode", but I've avoided that term here as each
// opcode is a 32-bit word, not an 8-bit byte.
//
// I tested various bit widths, and I believe 32 bit was the fastest, but also
// means we don't have to worry about jump offsets overflowing. That's tested
// in the compiler, but who's going to have an AWK program bigger than 2GB?
type Opcode int32
const (
Nop Opcode = iota
// Stack operations
Num // numIndex
Str // strIndex
Dupe
Drop
Swap
Rote
// Fetch a field, variable, or array item
Field
FieldInt // index
FieldByName
FieldByNameStr // strIndex
Global // index
Local // index
Special // index
ArrayGlobal // arrayIndex
ArrayLocal // arrayIndex
InGlobal // arrayIndex
InLocal // arrayIndex
// Assign a field, variable, or array item
AssignField
AssignGlobal // index
AssignLocal // index
AssignSpecial // index
AssignArrayGlobal // arrayIndex
AssignArrayLocal // arrayIndex
// Delete statement
Delete // arrayScope arrayIndex
DeleteAll // arrayScope arrayIndex
// Post-increment and post-decrement
IncrField // amount
IncrGlobal // amount index
IncrLocal // amount index
IncrSpecial // amount index
IncrArrayGlobal // amount arrayIndex
IncrArrayLocal // amount arrayIndex
// Augmented assignment (also used for pre-increment and pre-decrement)
AugAssignField // augOp
AugAssignGlobal // augOp index
AugAssignLocal // augOp index
AugAssignSpecial // augOp index
AugAssignArrayGlobal // augOp arrayIndex
AugAssignArrayLocal // augOp arrayIndex
// Stand-alone regex expression /foo/
Regex // regexIndex
// Multi-index concatenation
IndexMulti // num
// Multi-value concatenation
ConcatMulti // num
// Binary operators
Add
Subtract
Multiply
Divide
Power
Modulo
Equals
NotEquals
Less
Greater
LessOrEqual
GreaterOrEqual
Concat
Match
NotMatch
// Unary operators
Not
UnaryMinus
UnaryPlus
Boolean
// Control flow
Jump // offset
JumpFalse // offset
JumpTrue // offset
JumpEquals // offset
JumpNotEquals // offset
JumpLess // offset
JumpGreater // offset
JumpLessOrEqual // offset
JumpGreaterOrEqual // offset
Next
Nextfile
Exit
ExitStatus
ForIn // varScope varIndex arrayScope arrayIndex offset
BreakForIn
// Builtin functions
CallBuiltin // builtinOp
CallLengthArray // arrayScope arrayIndex
CallSplit // arrayScope arrayIndex
CallSplitSep // arrayScope arrayIndex
CallSprintf // numArgs
// User and native functions
CallUser // funcIndex numArrayArgs [arrayScope1 arrayIndex1 ...]
CallNative // funcIndex numArgs
Return
ReturnNull
Nulls // numNulls
// Print, printf, and getline
Print // numArgs redirect
Printf // numArgs redirect
Getline // redirect
GetlineField // redirect
GetlineGlobal // redirect index
GetlineLocal // redirect index
GetlineSpecial // redirect index
GetlineArray // redirect arrayScope arrayIndex
EndOpcode
)
// AugOp represents an augmented assignment operation.
type AugOp Opcode
const (
AugOpAdd AugOp = iota
AugOpSub
AugOpMul
AugOpDiv
AugOpPow
AugOpMod
)
// BuiltinOp represents a builtin function call.
type BuiltinOp Opcode
const (
BuiltinAtan2 BuiltinOp = iota
BuiltinClose
BuiltinCos
BuiltinExp
BuiltinFflush
BuiltinFflushAll
BuiltinGsub
BuiltinIndex
BuiltinInt
BuiltinLength
BuiltinLengthArg
BuiltinLog
BuiltinMatch
BuiltinRand
BuiltinSin
BuiltinSqrt
BuiltinSrand
BuiltinSrandSeed
BuiltinSub
BuiltinSubstr
BuiltinSubstrLength
BuiltinSystem
BuiltinTolower
BuiltinToupper
)
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