IF statement

• These blocks are super important because you can change most application behavior by switching a state from “true" to “false" and vice versa.

📍The most common if conditions available in Smali:

• Comparison against 0.

  Smali Instruction	Description	Java Equivalent
  if-eqz vX, :label	Checks if register vX is equal to zero	if (vX == 0)
  if-nez vX, :label	Checks if register vX is not equal to zero	if (vX != 0)
  if-lt vX, vY, :label	Checks if register vX is less than register vY	if (vX < vY)
  if-le vX, vY, :label	Checks if register vX is less than or equal to register vY	if (vX <= vY)
  if-gt vX, vY, :label	Checks if register vX is greater than register vY	if (vX > vY)
  if-ge vX, vY, :label	Checks if register vX is greater than or equal to register vY	if (vX >= vY)

• :label represents a location in the code to jump to if the condition is true.

• To read this:

• Comparison against a register

  Smali Instruction	Java Equivalent
  if-eq vx,vy,target	if vx == vy
  if-ne vx,vy,target	if (vX != vy)
  if-lt vx,vy,target	if (vX < vY)
  if-le vx,vy,target	if (vx =< vy)
  if-gt vx,vy,target	if (vx > vy)
  if-ge vx, vy,target	if (vx >= vy)

• target represents a location in the code to jump to if the condition is true.

• To read this:

• An Example

• Notes

  • Lines starting with a colon (e.g., :goto_0) are jump references and can be ignored.

  • Lines with instructions before the colon (e.g., if-lez v0 :cond_0) must not be ignored and require attention.

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