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Cairo1-run

A cairo-vm crate to run Cairo 1 Programs

Once you are inside the ./cairo1-run folder, use the CLI with the following commands

To install the required dependencies(cairo corelib) run

make deps

Now that you have the dependencies necessary to run the tests, you can run:

make test

To execute a Cairo 1 program (either as Cairo 1 source file or Sierra)

cargo run ../cairo_programs/cairo-1-programs/fibonacci.cairo

Arguments to generate the trace and memory files

cargo run ../cairo_programs/cairo-1-programs/fibonacci.cairo --trace_file ../cairo_programs/cairo-1-programs/fibonacci.trace --memory_file ../cairo_programs/cairo-1-programs/fibonacci.memory

To pass arguments to main

  • Separate arguments with a whitespace inbetween
  • In order to pass arrays, wrap array values between brackets

Example:

cargo run ../cairo_programs/cairo-1-programs/with_input/array_input_sum.cairo --layout all_cairo --args '2 [1 2 3 4] 0 [9 8]'

To execute all the cairo 1 programs inside ../cairo_programs/cairo-1-programs/ and generate the corresponding trace and the memory files

make run

CLI argument list

The cairo1-run cli supports the following optional arguments:

  • --layout <LAYOUT>: Sets the layout for the cairo_run. This will limit the available builtins. The deafult layout is plain, which has no builtins. For general purpose, the all_cairo layout contains all currently available builtins. More info about layouts here.

  • --args <ARGUMENTS>: Receives the arguments to be passed to the program's main function. Receives whitespace-separated values which can be numbers or arrays, with arrays consisting of whitespace-separated numbers wrapped between brackets

  • --trace_file <TRACE_FILE>: Receives the name of a file and outputs the relocated trace into it

  • --memory_file <MEMORY_FILE>: Receives the name of a file and outputs the relocated memory into it

  • --proof_mode: Runs the program in proof_mode

  • --air_public_input <AIR_PUBLIC_INPUT>: Receives the name of a file and outputs the AIR public inputs into it. Can only be used if proof_mode is also enabled.

  • --air_private_input <AIR_PRIVATE_INPUT>: Receives the name of a file and outputs the AIR private inputs into it. Can only be used if proof_mode, trace_file & memory_file are also enabled.

  • --cairo_pie_output <CAIRO_PIE_OUTPUT>: Receives the name of a file and outputs the Cairo PIE into it. Can only be used if proof_mode, is not enabled.

  • --append_return_values: Adds extra instructions to the program in order to append the return values to the output builtin's segment. This is the default behaviour for proof_mode.

Running scarb projects

As cairo1-run skips gas checks when running, you will need to add the following to your Scarb.toml to ensure that compilation is done without adding gas checks:

[cairo]
enable-gas = false

First compile your project running scarb build

Then run the compiled project's sierra file located at project_name/target/project_name.sierra.json

Example:

  cargo run path-to-project/target/project_name.sierra.json

Known bugs & issues

Libfunc get_builtin_costs & function poseidon_hash_many

Compiling without gas checks removes libfuncs associated with gas checks that are generated during compilation but it cannot remove those in the cairo code itself. Therefore code using the external functions on the gas corelib moudle (withdraw_gas, withdraw_gas_all & get_builtin_costs) will fail to compile. One notable case of this issue is the poseidon_hash_span function, which uses get_builtin_costs in its implementation. We advise using the HashStateTrait impl instead. The poseidon_hash_span function can also be modified so that it no longer relies on gas, an example of this can be found on the test file poseidon.cairo under the cairo_porgrams/cairo-1-programs folder.

Nullable<Box>

There is currently a bug in cairo 2.6.3 affecting Nullable<Box<T>> types. Tracking issue: starkware-libs/cairo#5411

Proposed solution:

Add the helper function:

#[inline(never)]
fn identity<T>(t: T) -> T { t }

And use it when creating the Nullable<Box<T>>:

NullableTrait::<Box<T>::new(BoxTrait::new(identity(value)))