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Stack Memory Storage and Flow Operations

Index 1 is top of the stack. See PUSH.

Notes

The program counter (PC) is a byte offset in the deployed code. It indicates which instruction will be executed next. When an ADD is executed, for example, the PC is incremented by 1, since the instruction is 1 byte. The PUSH instructions are bigger than one byte, and so will increment the counter accordingly.

Stack output

  1. counter: PC of this instruction in the current program.

Example

See in playground.

Error cases

The state changes done by the current context are reverted in those cases:

  • Not enough gas.
  • Stack overflow.