code

Documentation

Overview

Package code contains the bytecode instructions for the mtail virtual machine.

Package code contains the bytecode instructions for the mtail virtual machine.

Index

• type Instr
  • func (i Instr) String() string
• type Opcode
  • func (o Opcode) String() string

Types

type Instr

type Instr struct {
	Opcode  Opcode
	Operand interface{}
}

func (Instr) String

func (i Instr) String() string

debug print for instructions

type Opcode

type Opcode int

const (
	Bad        Opcode = iota // Invalid instruction, indicates a bug in the generator.
	Stop                     // Stop the program, ending processing of this input.
	Match                    // Match a regular expression against input, and set the match register.
	Smatch                   // Match a regular expression against top of stack, and set the match register.
	Cmp                      // Compare two values on the stack and set the match register.
	Jnm                      // Jump if no match.
	Jm                       // Jump if match.
	Jmp                      // Unconditional jump
	Inc                      // Increment a variable value
	Dec                      // Decrement a variable value
	Strptime                 // Parse into the timestamp register
	Timestamp                // Return value of timestamp register onto TOS.
	Settime                  // Set timestamp register to value at TOS.
	Push                     // Push operand onto stack
	Capref                   // Push capture group reference at operand onto stack
	Str                      // Push string constant at operand onto stack
	Sset                     // Set a string variable value.
	Iset                     // Set a variable value
	Iadd                     // Add top values on stack and push to stack
	Isub                     // Subtract top value from second top value on stack, and push to stack.
	Imul                     // Multiply top values on stack and push to stack
	Idiv                     // Divide top value into second top on stack, and push
	Imod                     // Integer divide top value into second top on stack, and push remainder
	Ipow                     // Put second TOS to power of TOS, and push.
	And                      // Bitwise AND the 2 at top of stack, and push result
	Or                       // Bitwise OR the 2 at top of stack, and push result
	Xor                      // Bitwise XOR the 2 at top of stack, and push result
	Neg                      // Bitwise NOT the top of stack, and push result
	Not                      // Boolean NOT the top of stack, and push result
	Shl                      // Shift TOS left, push result
	Shr                      // Shift TOS right, push result
	Mload                    // Load metric at operand onto top of stack
	Dload                    // Pop `operand` keys and metric off stack, and push datum at metric[key,...] onto stack.
	Iget                     // Pop a datum off the stack, and push its integer value back on the stack.
	Fget                     // Pop a datum off the stack, and push its float value back on the stack.
	Sget                     // Pop a datum off the stack, and push its string value back on the stack.
	Tolower                  // Convert the string at the top of the stack to lowercase.
	Length                   // Compute the length of a string.
	Cat                      // string concatenation
	Setmatched               // Set "matched" flag
	Otherwise                // Only match if "matched" flag is false.
	Del                      // Pop `operand` keys and metric off stack, and remove the datum at metric[key,...] from memory
	Expire                   // Set the expiry duration of a datum, perfoming the same as del but after the expiry time passes.

	// Floating point ops
	Fadd
	Fsub
	Fmul
	Fdiv
	Fmod
	Fpow
	Fset // Floating point assignment

	Getfilename // Push input.Filename onto the stack.

	// Conversions
	I2f // int to float
	S2i // string to int
	S2f // string to float
	I2s // int to string
	F2s // float to string

	// Typed comparisons, behave the same as cmp but do no conversion.
	Icmp // integer compare
	Fcmp // floating point compare
	Scmp // string compare

)

func (Opcode) String

func (o Opcode) String() string