150 lines
4.4 KiB
Go
150 lines
4.4 KiB
Go
package vm
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type opHandler func(*State, *Instruction)
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var opHandlers = map[OpCodeType]opHandler{
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OpNoOp: (*State).NoOp,
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OpCall: (*State).Call,
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OpReturn: (*State).Return,
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OpMove: (*State).Move,
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OpAdd: (*State).Add,
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OpSubtract: (*State).Subtract,
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OpMultiply: (*State).Multiply,
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OpDivideUnsigned: (*State).DivideUnsigned,
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OpDivideSigned: (*State).DivideSigned,
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OpIsEqual: (*State).IsEqual,
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OpIsLessThanUnsigned: (*State).IsLessThanUnsigned,
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OpIsLessThanSigned: (*State).IsLessThanSigned,
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OpIsGreaterThanUnsigned: (*State).IsGreaterThanUnsigned,
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OpIsGreaterThanSigned: (*State).IsGreaterThanSigned,
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OpIsLessThanOrEqualUnsigned: (*State).IsLessThanOrEqualUnsigned,
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OpIsLessThanOrEqualSigned: (*State).IsLessThanOrEqualSigned,
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OpIsGreaterThanOrEqualUnsigned: (*State).IsGreaterThanOrEqualUnsigned,
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OpIsGreaterThanOrEqualSigned: (*State).IsGreaterThanOrEqualSigned,
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OpJump: (*State).Jump,
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OpJumpIfTrue: (*State).JumpIfTrue,
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OpJumpIfFalse: (*State).JumpIfFalse,
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}
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func (state *State) NoOp(instr *Instruction) {
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}
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func (state *State) Call(instr *Instruction) {
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in := state.readSigned(&instr.Operand1)
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state.call(in)
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}
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func (state *State) Return(instr *Instruction) {
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state.ret()
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}
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func (state *State) Move(instr *Instruction) {
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in := state.readUnsigned(&instr.Operand2)
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state.writeUnsigned(&instr.Operand1, in)
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}
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func (state *State) Add(instr *Instruction) {
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in1 := state.readUnsigned(&instr.Operand1)
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in2 := state.readUnsigned(&instr.Operand2)
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state.writeUnsigned(&instr.Operand1, in1+in2)
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}
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func (state *State) Subtract(instr *Instruction) {
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in1 := state.readUnsigned(&instr.Operand1)
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in2 := state.readUnsigned(&instr.Operand2)
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state.writeUnsigned(&instr.Operand1, in1-in2)
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}
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func (state *State) Multiply(instr *Instruction) {
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in1 := state.readUnsigned(&instr.Operand1)
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in2 := state.readUnsigned(&instr.Operand2)
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state.writeUnsigned(&instr.Operand1, in1*in2)
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}
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func (state *State) DivideUnsigned(instr *Instruction) {
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in1 := state.readUnsigned(&instr.Operand1)
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in2 := state.readUnsigned(&instr.Operand2)
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state.writeUnsigned(&instr.Operand1, in1/in2)
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}
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func (state *State) DivideSigned(instr *Instruction) {
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in1 := state.readSigned(&instr.Operand1)
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in2 := state.readSigned(&instr.Operand2)
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state.writeSigned(&instr.Operand1, in1/in2)
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}
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func (state *State) IsEqual(instr *Instruction) {
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in1 := state.readUnsigned(&instr.Operand1)
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in2 := state.readUnsigned(&instr.Operand2)
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state.comparisonResult = (in1 == in2)
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}
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func (state *State) IsLessThanUnsigned(instr *Instruction) {
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in1 := state.readUnsigned(&instr.Operand1)
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in2 := state.readUnsigned(&instr.Operand2)
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state.comparisonResult = (in1 < in2)
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}
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func (state *State) IsLessThanSigned(instr *Instruction) {
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in1 := state.readSigned(&instr.Operand1)
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in2 := state.readSigned(&instr.Operand2)
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state.comparisonResult = (in1 < in2)
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}
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func (state *State) IsGreaterThanUnsigned(instr *Instruction) {
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in1 := state.readUnsigned(&instr.Operand1)
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in2 := state.readUnsigned(&instr.Operand2)
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state.comparisonResult = (in1 > in2)
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}
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func (state *State) IsGreaterThanSigned(instr *Instruction) {
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in1 := state.readSigned(&instr.Operand1)
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in2 := state.readSigned(&instr.Operand2)
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state.comparisonResult = (in1 > in2)
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}
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func (state *State) IsLessThanOrEqualUnsigned(instr *Instruction) {
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in1 := state.readUnsigned(&instr.Operand1)
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in2 := state.readUnsigned(&instr.Operand2)
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state.comparisonResult = (in1 <= in2)
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}
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func (state *State) IsLessThanOrEqualSigned(instr *Instruction) {
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in1 := state.readSigned(&instr.Operand1)
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in2 := state.readSigned(&instr.Operand2)
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state.comparisonResult = (in1 <= in2)
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}
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func (state *State) IsGreaterThanOrEqualUnsigned(instr *Instruction) {
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in1 := state.readUnsigned(&instr.Operand1)
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in2 := state.readUnsigned(&instr.Operand2)
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state.comparisonResult = (in1 >= in2)
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}
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func (state *State) IsGreaterThanOrEqualSigned(instr *Instruction) {
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in1 := state.readSigned(&instr.Operand1)
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in2 := state.readSigned(&instr.Operand2)
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state.comparisonResult = (in1 >= in2)
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}
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func (state *State) Jump(instr *Instruction) {
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in := state.readSigned(&instr.Operand1)
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state.instructionIndex += in - 1
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}
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func (state *State) JumpIfTrue(instr *Instruction) {
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if state.comparisonResult == true {
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state.Jump(instr)
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}
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}
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func (state *State) JumpIfFalse(instr *Instruction) {
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if state.comparisonResult == false {
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state.Jump(instr)
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}
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}
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