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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| // Copyright Kani Contributors | ||
| // SPDX-License-Identifier: Apache-2.0 OR MIT | ||
|
|
||
| //! Logic used for generating the code that generates contract preconditions and postconditions as assertions. | ||
| use proc_macro2::{Ident, Span, TokenStream as TokenStream2}; | ||
| use quote::quote; | ||
| use std::mem; | ||
| use syn::{Stmt, parse_quote}; | ||
|
|
||
| use super::{ | ||
| ContractConditionsData, ContractConditionsHandler, ContractMode, INTERNAL_RESULT_IDENT, | ||
| helpers::*, | ||
| shared::{build_ensures, split_for_remembers}, | ||
| }; | ||
|
|
||
| impl<'a> ContractConditionsHandler<'a> { | ||
| /// Generate a token stream that represents the assert closure. | ||
| /// | ||
| /// See [`Self::make_assert_body`] for the most interesting parts of this | ||
| /// function. | ||
| pub fn assert_closure(&self) -> TokenStream2 { | ||
| let assert_ident = Ident::new(&self.assert_name, Span::call_site()); | ||
| let sig = &self.annotated_fn.sig; | ||
| let output = &sig.output; | ||
| let body_stmts = self.initial_assert_stmts(); | ||
| let body = self.make_assert_body(body_stmts); | ||
|
|
||
| quote!( | ||
| #[kanitool::is_contract_generated(assert)] | ||
| #[allow(dead_code, unused_variables, unused_mut)] | ||
| let mut #assert_ident = || #output #body; | ||
| ) | ||
| } | ||
|
|
||
| /// Expand the assert closure body. | ||
| pub fn expand_assert(&self, closure: &mut Stmt) { | ||
| let body = closure_body(closure); | ||
| *body = syn::parse2(self.make_assert_body(mem::take(&mut body.block.stmts))).unwrap(); | ||
| } | ||
|
|
||
| /// Initialize the list of statements for the assert closure body. | ||
| /// Construct a closure that wraps the body of the function, then invoke it and return the result. | ||
| fn initial_assert_stmts(&self) -> Vec<Stmt> { | ||
| let body_wrapper_ident = Ident::new("body_wrapper", Span::call_site()); | ||
| let output = &self.annotated_fn.sig.output; | ||
| let return_type = return_type_to_type(&output); | ||
| let stmts = &self.annotated_fn.block.stmts; | ||
| let result = Ident::new(INTERNAL_RESULT_IDENT, Span::call_site()); | ||
|
|
||
| parse_quote!( | ||
| let mut body_wrapper = || #output { | ||
| #(#stmts)* | ||
| }; | ||
| let #result : #return_type = #body_wrapper_ident(); | ||
| #result | ||
| ) | ||
| } | ||
|
|
||
| /// Create the body of an assert closure. | ||
| /// | ||
| /// Wraps the conditions from this attribute around `self.body`. | ||
| fn make_assert_body(&self, mut body_stmts: Vec<Stmt>) -> TokenStream2 { | ||
| let Self { attr_copy, .. } = self; | ||
| match &self.condition_type { | ||
| ContractConditionsData::Requires { attr } => { | ||
| quote!({ | ||
| kani::assert(#attr, stringify!(#attr_copy)); | ||
| #(#body_stmts)* | ||
| }) | ||
| } | ||
| ContractConditionsData::Ensures { attr } => { | ||
| let (remembers, ensures_clause) = build_ensures(attr); | ||
|
|
||
| let exec_postconditions = quote!( | ||
| kani::assert(#ensures_clause, stringify!(#attr_copy)); | ||
| ); | ||
|
|
||
| let return_expr = body_stmts.pop(); | ||
|
|
||
| let (asserts, rest_of_body) = | ||
| split_for_remembers(&body_stmts[..], ContractMode::Assert); | ||
|
|
||
| quote!({ | ||
| #(#asserts)* | ||
| #remembers | ||
| #(#rest_of_body)* | ||
| #exec_postconditions | ||
| #return_expr | ||
| }) | ||
| } | ||
| ContractConditionsData::Modifies { .. } => { | ||
| quote!({#(#body_stmts)*}) | ||
| } | ||
| } | ||
| } | ||
| } |
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