cairo-lang-lowering 2.6.4

Cairo lowering phase.
Documentation 
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//! > Test nopanic function cycle.

//! > test_runner_name
test_function_lowering

//! > function
fn foo(x: felt252) nopanic {
    foo(x);
}

//! > function_name
foo

//! > module_code

//! > semantic_diagnostics

//! > lowering_diagnostics
error: Call cycle of `nopanic` functions is not allowed.
 --> lib.cairo:1:1
fn foo(x: felt252) nopanic {
^**************************^

//! > lowering_flat
Parameters: v16: core::RangeCheck, v17: core::gas::GasBuiltin, v0: core::felt252
blk0 (root):
Statements:
End:
  Match(match core::gas::withdraw_gas(v16, v17) {
    Option::Some(v18, v19) => blk1,
    Option::None(v20, v21) => blk2,
  })

blk1:
Statements:
  (v22: core::RangeCheck, v23: core::gas::GasBuiltin, v8: core::panics::PanicResult::<((),)>) <- test::foo(v18, v19, v0)
End:
  Return(v22, v23, v8)

blk2:
Statements:
  (v3: core::array::Array::<core::felt252>) <- core::array::array_new::<core::felt252>()
  (v4: core::felt252) <- 375233589013918064796019
  (v6: core::array::Array::<core::felt252>) <- core::array::array_append::<core::felt252>(v3, v4)
  (v5: core::panics::Panic) <- struct_construct()
  (v7: (core::panics::Panic, core::array::Array::<core::felt252>)) <- struct_construct(v5, v6)
  (v12: core::panics::PanicResult::<((),)>) <- PanicResult::Err(v7)
End:
  Return(v20, v21, v12)

//! > ==========================================================================

//! > Test explicit gas handling.

//! > test_runner_name
test_function_lowering

//! > function
fn foo(x: felt252) {  
  match core::gas::withdraw_gas() {
    Option::Some(_) => foo(x),
    Option::None => {}
  }
}

//! > function_name
foo

//! > module_code

//! > semantic_diagnostics

//! > lowering_diagnostics

//! > lowering_flat
Parameters: v4: core::RangeCheck, v5: core::gas::GasBuiltin, v0: core::felt252
blk0 (root):
Statements:
End:
  Match(match core::gas::withdraw_gas(v4, v5) {
    Option::Some(v6, v7) => blk1,
    Option::None(v8, v9) => blk2,
  })

blk1:
Statements:
  (v10: core::RangeCheck, v11: core::gas::GasBuiltin) <- test::foo(v6, v7, v0)
End:
  Return(v10, v11)

blk2:
Statements:
End:
  Return(v8, v9)

//! > ==========================================================================

//! > Test nopanic function cycle with withdraw gas.

//! > test_runner_name
test_function_lowering

//! > function
fn foo(x: felt252, costs: core::gas::BuiltinCosts) nopanic {
  match core::gas::withdraw_gas_all(costs) {
    Option::Some(_) => foo(x, costs),
    Option::None => {}
  }
}

//! > function_name
foo

//! > module_code

//! > semantic_diagnostics

//! > lowering_diagnostics

//! > lowering_flat
Parameters: v5: core::RangeCheck, v6: core::gas::GasBuiltin, v0: core::felt252, v1: core::gas::BuiltinCosts
blk0 (root):
Statements:
End:
  Match(match core::gas::withdraw_gas_all(v5, v6, v1) {
    Option::Some(v7, v8) => blk1,
    Option::None(v9, v10) => blk2,
  })

blk1:
Statements:
  (v11: core::RangeCheck, v12: core::gas::GasBuiltin) <- test::foo(v7, v8, v0, v1)
End:
  Return(v11, v12)

blk2:
Statements:
End:
  Return(v9, v10)