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Algorand Specifications

Constants can be pushed onto the Stack in two different ways:

1. Constants can be pushed directly with pushint or pushbytes opcodes. This method is more efficient for constants that are only used once.

2. Constants can be loaded into storage separate from the Stack and Scratch Space, with intcblock or bytecblock opcodes. Then, constants from this storage can be pushed onto the Stack by referring to the type and index using intc, intc_[0123], bytec, and bytec_[0123]. This method is more efficient for constants that are used multiple times.

The opcodes intcblock and bytecblock use proto-buf style variable length unsigned int, reproduced in the varuint section.

The intcblock opcode is followed by a varuint specifying the number of integer constants, and then that number of varuint.

The bytecblock opcode is followed by a varuint specifying the number of byte constants, and then that number of pairs of (varuint, bytes) length prefixed byte strings.

The Assembler will hide most of this, for example, allowing simple use of int 1234 and byte 0xcafed00d. Constants introduced via int and byte will be assembled into appropriate uses of pushint|pushbytes and {int|byte}c, {int|byte}c_[0123] to minimize program bytecode size.

An application call transaction MUST indicate the action to be taken following the execution of its Approval Program or Clear State Program.

The constants below describe the available actions.