solang 0.3.4

// SPDX-License-Identifier: Apache-2.0

#![cfg(test)]

use crate::diagnostics::Diagnostics;
use crate::sema::ast::{ArrayLength, Namespace, Parameter, Symbol, Type, Variable};
use crate::sema::expression::ExprContext;
use crate::sema::symtable::{Symtable, VariableInitializer, VariableUsage};
use crate::sema::yul::ast::{YulExpression, YulSuffix};
use crate::sema::yul::builtin::YulBuiltInFunction;
use crate::sema::yul::expression::{check_type, resolve_yul_expression};
use crate::sema::yul::functions::FunctionsTable;
use crate::sema::yul::tests::parse;
use crate::{parse_and_resolve, sema::ast, FileResolver, Target};
use num_bigint::BigInt;
use solang_parser::pt;
use solang_parser::pt::{
    ContractTy, HexLiteral, Identifier, Loc, StorageLocation, StringLiteral, Visibility,
    YulFunctionCall,
};
use std::ffi::OsStr;
use std::sync::Arc;

#[test]
fn resolve_bool_literal() {
    let mut ctx = ExprContext::default();
    ctx.enter_scope();
    let mut symtable = Symtable::default();
    let mut function_table = FunctionsTable::new(0);

    let mut ns = Namespace::new(Target::Solana);
    let expr = pt::YulExpression::BoolLiteral(
        Loc::File(0, 3, 5),
        false,
        Some(pt::Identifier {
            loc: Loc::File(0, 3, 4),
            name: "u32".to_string(),
        }),
    );

    let resolved_type =
        resolve_yul_expression(&expr, &mut ctx, &mut symtable, &mut function_table, &mut ns);
    assert!(resolved_type.is_ok());
    assert!(ns.diagnostics.is_empty());
    let unwrapped = resolved_type.unwrap();

    assert_eq!(
        unwrapped,
        YulExpression::BoolLiteral(Loc::File(0, 3, 5), false, Type::Uint(32))
    );

    let expr = pt::YulExpression::BoolLiteral(Loc::File(0, 3, 5), true, None);
    let resolved_type =
        resolve_yul_expression(&expr, &mut ctx, &mut symtable, &mut function_table, &mut ns);

    assert!(resolved_type.is_ok());
    assert!(ns.diagnostics.is_empty());
    let unwrapped = resolved_type.unwrap();
    assert_eq!(
        unwrapped,
        YulExpression::BoolLiteral(Loc::File(0, 3, 5), true, Type::Bool)
    );
}

#[test]
fn resolve_number_literal() {
    let mut ctx = ExprContext::default();
    ctx.enter_scope();
    let mut symtable = Symtable::default();
    let mut function_table = FunctionsTable::new(0);

    let loc = Loc::File(0, 3, 5);
    let mut ns = Namespace::new(Target::Solana);
    let expr = pt::YulExpression::NumberLiteral(
        loc,
        "4722366482869645213695".to_string(),
        "".to_string(),
        Some(Identifier {
            loc,
            name: "u64".to_string(),
        }),
    );
    let parsed =
        resolve_yul_expression(&expr, &mut ctx, &mut symtable, &mut function_table, &mut ns);
    assert!(parsed.is_ok());
    assert_eq!(ns.diagnostics.len(), 1);
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "the provided literal requires 72 bits, but the type only supports 64"
    );

    ns.diagnostics = Diagnostics::default();
    let expr = pt::YulExpression::NumberLiteral(
        loc,
        "-50".to_string(),
        "".to_string(),
        Some(Identifier {
            loc,
            name: "u128".to_string(),
        }),
    );
    let parsed =
        resolve_yul_expression(&expr, &mut ctx, &mut symtable, &mut function_table, &mut ns);
    assert!(parsed.is_err());
    assert_eq!(ns.diagnostics.len(), 1);
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "signed integer cannot fit in unsigned integer"
    );

    ns.diagnostics = Diagnostics::default();
    let expr = pt::YulExpression::NumberLiteral(loc, "20".to_string(), "".to_string(), None);
    let parsed =
        resolve_yul_expression(&expr, &mut ctx, &mut symtable, &mut function_table, &mut ns);
    assert!(parsed.is_ok());
    assert!(ns.diagnostics.is_empty());
    assert_eq!(
        parsed.unwrap(),
        YulExpression::NumberLiteral(loc, BigInt::from(20), Type::Uint(256))
    );
}

#[test]
fn resolve_hex_number_literal() {
    let mut ctx = ExprContext::default();
    ctx.enter_scope();
    let mut symtable = Symtable::default();
    let mut function_table = FunctionsTable::new(0);

    let mut ns = Namespace::new(Target::EVM);
    let loc = Loc::File(0, 3, 5);
    let expr = pt::YulExpression::HexNumberLiteral(
        loc,
        "0xf23456789a".to_string(),
        Some(Identifier {
            loc,
            name: "u32".to_string(),
        }),
    );

    let resolved =
        resolve_yul_expression(&expr, &mut ctx, &mut symtable, &mut function_table, &mut ns);
    assert!(resolved.is_ok());
    assert_eq!(ns.diagnostics.len(), 1);
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "the provided literal requires 40 bits, but the type only supports 32"
    );

    ns.diagnostics = Diagnostics::default();
    let expr = pt::YulExpression::HexNumberLiteral(
        loc,
        "0xff".to_string(),
        Some(Identifier {
            loc,
            name: "s64".to_string(),
        }),
    );
    let resolved =
        resolve_yul_expression(&expr, &mut ctx, &mut symtable, &mut function_table, &mut ns);
    assert!(resolved.is_ok());
    assert!(ns.diagnostics.is_empty());
    assert_eq!(
        resolved.unwrap(),
        YulExpression::NumberLiteral(loc, BigInt::from(255), Type::Int(64))
    );
}

#[test]
fn resolve_hex_string_literal() {
    let mut ctx = ExprContext::default();
    ctx.enter_scope();
    let mut symtable = Symtable::default();
    let mut function_table = FunctionsTable::new(0);

    let mut ns = Namespace::new(Target::EVM);
    let loc = Loc::File(0, 3, 5);
    let expr = pt::YulExpression::HexStringLiteral(
        HexLiteral {
            loc,
            hex: "3ca".to_string(),
        },
        None,
    );

    let resolved =
        resolve_yul_expression(&expr, &mut ctx, &mut symtable, &mut function_table, &mut ns);
    assert!(resolved.is_err());
    assert_eq!(ns.diagnostics.len(), 1);
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "hex string \"3ca\" has odd number of characters"
    );

    ns.diagnostics = Diagnostics::default();
    let expr = pt::YulExpression::HexStringLiteral(
        HexLiteral {
            loc,
            hex: "acdf".to_string(),
        },
        Some(Identifier {
            loc,
            name: "myType".to_string(),
        }),
    );
    let resolved =
        resolve_yul_expression(&expr, &mut ctx, &mut symtable, &mut function_table, &mut ns);
    assert!(resolved.is_err());
    assert_eq!(ns.diagnostics.len(), 1);
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "the specified type 'myType' does not exist"
    );

    ns.diagnostics = Diagnostics::default();
    let expr = pt::YulExpression::HexStringLiteral(
        HexLiteral {
            loc,
            hex: "ffff".to_string(),
        },
        Some(Identifier {
            loc,
            name: "u256".to_string(),
        }),
    );
    let resolved =
        resolve_yul_expression(&expr, &mut ctx, &mut symtable, &mut function_table, &mut ns);
    assert!(resolved.is_ok());
    assert!(ns.diagnostics.is_empty());
    assert_eq!(
        resolved.unwrap(),
        YulExpression::StringLiteral(loc, vec![255, 255], Type::Uint(256))
    );
}

#[test]
fn resolve_string_literal() {
    let mut ctx = ExprContext::default();
    ctx.enter_scope();
    let mut symtable = Symtable::default();
    let mut function_table = FunctionsTable::new(0);

    let mut ns = Namespace::new(Target::Solana);
    let loc = Loc::File(0, 3, 5);
    let expr = pt::YulExpression::StringLiteral(
        StringLiteral {
            loc,
            unicode: false,
            string: r"ab\xffa\u00e0g".to_string(),
        },
        Some(Identifier {
            loc,
            name: "u128".to_string(),
        }),
    );

    let resolved =
        resolve_yul_expression(&expr, &mut ctx, &mut symtable, &mut function_table, &mut ns);
    assert!(resolved.is_ok());
    assert!(ns.diagnostics.is_empty());
    assert_eq!(
        resolved.unwrap(),
        YulExpression::StringLiteral(loc, vec![97, 98, 255, 97, 0xc3, 0xa0, 103], Type::Uint(128))
    );
}

#[test]
fn resolve_variable_local() {
    let mut context = ExprContext::default();
    context.enter_scope();
    let mut symtable = Symtable::default();
    let mut function_table = FunctionsTable::new(0);
    let mut ns = Namespace::new(Target::EVM);
    let loc = Loc::File(1, 2, 3);

    let pos1 = symtable
        .add(
            &Identifier {
                loc,
                name: "var1".to_string(),
            },
            Type::Uint(32),
            &mut ns,
            VariableInitializer::Yul(false),
            VariableUsage::YulLocalVariable,
            None,
            &mut context,
        )
        .unwrap();
    let pos2 = symtable
        .add(
            &Identifier {
                loc,
                name: "var2".to_string(),
            },
            Type::Uint(32),
            &mut ns,
            VariableInitializer::Yul(false),
            VariableUsage::LocalVariable,
            None,
            &mut context,
        )
        .unwrap();

    let expr1 = pt::YulExpression::Variable(Identifier {
        loc,
        name: "var1".to_string(),
    });
    let expr2 = pt::YulExpression::Variable(Identifier {
        loc,
        name: "var2".to_string(),
    });

    let expected_1 = YulExpression::YulLocalVariable(loc, Type::Uint(32), pos1);
    let expected_2 = YulExpression::SolidityLocalVariable(loc, Type::Uint(32), None, pos2);

    let res1 = resolve_yul_expression(
        &expr1,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    let res2 = resolve_yul_expression(
        &expr2,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );

    assert!(res1.is_ok());
    assert!(res2.is_ok());
    assert!(ns.diagnostics.is_empty());

    assert_eq!(expected_1, res1.unwrap());
    assert_eq!(expected_2, res2.unwrap());
}

#[test]
fn resolve_variable_contract() {
    let mut context = ExprContext {
        contract_no: Some(0),
        function_no: Some(0),
        ..Default::default()
    };
    context.enter_scope();

    let mut symtable = Symtable::default();
    let mut function_table = FunctionsTable::new(0);
    let mut ns = Namespace::new(Target::EVM);
    let loc = Loc::File(0, 2, 3);
    let mut contract = ast::Contract::new(
        &pt::Identifier {
            name: "test".to_string(),
            loc: pt::Loc::Codegen,
        },
        ContractTy::Contract(loc),
        vec![],
        loc,
    );
    contract.variables.push(Variable {
        tags: vec![],
        name: "var1".to_string(),
        loc,
        ty: Type::Bool,
        visibility: Visibility::Public(None),
        constant: true,
        immutable: false,
        initializer: None,
        assigned: false,
        read: false,
        storage_type: None,
    });
    contract.variables.push(Variable {
        tags: vec![],
        name: "var2".to_string(),
        loc,
        ty: Type::Int(128),
        visibility: Visibility::Public(None),
        constant: false,
        immutable: false,
        initializer: None,
        assigned: false,
        read: false,
        storage_type: None,
    });

    contract.variables.push(Variable {
        tags: vec![],
        name: "imut".to_string(),
        loc,
        ty: Type::Int(128),
        visibility: Visibility::Public(None),
        constant: false,
        immutable: true,
        initializer: None,
        assigned: false,
        read: false,
        storage_type: None,
    });

    ns.contracts.push(contract);

    ns.constants.push(Variable {
        tags: vec![],
        name: "var3".to_string(),
        loc,
        ty: Type::Uint(32),
        visibility: Visibility::Public(None),
        constant: true,
        immutable: false,
        initializer: None,
        assigned: false,
        read: false,
        storage_type: None,
    });

    ns.variable_symbols.insert(
        (0, Some(0), "var1".to_string()),
        Symbol::Variable(loc, Some(0), 0),
    );
    ns.variable_symbols.insert(
        (0, Some(0), "var2".to_string()),
        Symbol::Variable(loc, Some(0), 1),
    );
    ns.variable_symbols.insert(
        (0, Some(0), "imut".to_string()),
        Symbol::Variable(loc, Some(0), 2),
    );
    ns.variable_symbols.insert(
        (0, None, "var3".to_string()),
        Symbol::Variable(loc, None, 0),
    );
    ns.variable_symbols
        .insert((0, Some(0), "func".to_string()), Symbol::Function(vec![]));

    let expr = pt::YulExpression::Variable(Identifier {
        loc,
        name: "var1".to_string(),
    });
    let res = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(res.is_ok());
    assert_eq!(
        YulExpression::ConstantVariable(loc, Type::Bool, Some(0), 0),
        res.unwrap()
    );

    let expr = pt::YulExpression::Variable(Identifier {
        loc,
        name: "var2".to_string(),
    });
    let res = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(res.is_ok());
    assert_eq!(
        YulExpression::StorageVariable(loc, Type::Int(128), 0, 1),
        res.unwrap()
    );

    let expr = pt::YulExpression::Variable(Identifier {
        loc,
        name: "var3".to_string(),
    });
    let res = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(res.is_ok());
    assert_eq!(
        YulExpression::ConstantVariable(loc, Type::Uint(32), None, 0),
        res.unwrap()
    );

    let expr = pt::YulExpression::Variable(Identifier {
        loc,
        name: "func".to_string(),
    });
    let res = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(res.is_err());
    assert_eq!(ns.diagnostics.len(), 1);
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "only variables can be accessed inside assembly blocks"
    );

    ns.diagnostics = Diagnostics::default();
    let expr = pt::YulExpression::Variable(Identifier {
        loc,
        name: "none".to_string(),
    });
    let res = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(res.is_err());
    assert_eq!(ns.diagnostics.len(), 1);
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "'none' not found"
    );

    ns.diagnostics = Diagnostics::default();
    let expr = pt::YulExpression::Variable(Identifier {
        loc,
        name: "imut".to_string(),
    });
    let res = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(res.is_err());
    assert_eq!(ns.diagnostics.len(), 1);
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "assembly access to immutable variables is not supported"
    );
}

#[test]
fn function_call() {
    let mut context = ExprContext::default();
    context.enter_scope();
    let mut symtable = Symtable::default();
    let mut function_table = FunctionsTable::new(0);
    function_table.enter_scope();
    let mut ns = Namespace::new(Target::EVM);
    let loc = Loc::File(0, 2, 3);

    let expr = pt::YulExpression::FunctionCall(Box::new(YulFunctionCall {
        loc,
        id: Identifier {
            loc,
            name: "verbatim_1i_2o".to_string(),
        },
        arguments: vec![],
    }));
    let res = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(res.is_err());
    assert_eq!(ns.diagnostics.len(), 1);
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "verbatim functions are not yet supported in Solang"
    );
    ns.diagnostics = Diagnostics::default();

    let expr = pt::YulExpression::FunctionCall(Box::new(YulFunctionCall {
        loc,
        id: Identifier {
            loc,
            name: "linkersymbol".to_string(),
        },
        arguments: vec![],
    }));
    let res = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(res.is_err());
    assert_eq!(ns.diagnostics.len(), 1);
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "the internal EVM built-in 'linkersymbol' is not yet supported"
    );
    ns.diagnostics = Diagnostics::default();

    let arg = pt::YulExpression::BoolLiteral(
        Loc::File(0, 3, 5),
        false,
        Some(pt::Identifier {
            loc: Loc::File(0, 3, 4),
            name: "u32".to_string(),
        }),
    );

    let expr = pt::YulExpression::FunctionCall(Box::new(YulFunctionCall {
        loc,
        id: Identifier {
            loc,
            name: "add".to_string(),
        },
        arguments: vec![arg.clone()],
    }));
    let res = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(res.is_err());
    assert_eq!(ns.diagnostics.len(), 1);
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "builtin function 'add' requires 2 arguments, but 1 were provided"
    );
    ns.diagnostics = Diagnostics::default();

    let expr = pt::YulExpression::FunctionCall(Box::new(YulFunctionCall {
        loc,
        id: Identifier {
            loc,
            name: "not".to_string(),
        },
        arguments: vec![arg.clone()],
    }));
    let res = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(res.is_ok());
    assert_eq!(
        YulExpression::BuiltInCall(
            loc,
            YulBuiltInFunction::Not,
            vec![resolve_yul_expression(
                &arg,
                &mut context,
                &mut symtable,
                &mut function_table,
                &mut ns
            )
            .unwrap()]
        ),
        res.unwrap()
    );

    function_table.add_function_header(
        &Identifier {
            loc,
            name: "myFunc".to_string(),
        },
        vec![],
        vec![],
    );

    let expr = pt::YulExpression::FunctionCall(Box::new(YulFunctionCall {
        loc,
        id: Identifier {
            loc,
            name: "myFunc".to_string(),
        },
        arguments: vec![arg.clone()],
    }));
    let res = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(res.is_err());
    assert_eq!(ns.diagnostics.len(), 1);
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "function 'myFunc' requires 0 arguments, but 1 were provided"
    );
    ns.diagnostics = Diagnostics::default();

    let expr = pt::YulExpression::FunctionCall(Box::new(YulFunctionCall {
        loc,
        id: Identifier {
            loc,
            name: "myFunc".to_string(),
        },
        arguments: vec![],
    }));
    let res = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(res.is_ok());
    assert_eq!(
        YulExpression::FunctionCall(loc, 0, vec![], Arc::new(vec![])),
        res.unwrap()
    );

    let expr = pt::YulExpression::FunctionCall(Box::new(YulFunctionCall {
        loc,
        id: Identifier {
            loc,
            name: "none".to_string(),
        },
        arguments: vec![],
    }));
    let res = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(res.is_err());
    assert_eq!(ns.diagnostics.len(), 1);
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "function 'none' is not defined"
    );
}

#[test]
fn check_arguments() {
    let mut context = ExprContext::default();
    context.enter_scope();
    let mut symtable = Symtable::default();
    let mut function_table = FunctionsTable::new(0);
    function_table.enter_scope();
    let mut ns = Namespace::new(Target::EVM);
    let loc = Loc::File(0, 2, 3);

    function_table.add_function_header(
        &Identifier {
            loc,
            name: "func1".to_string(),
        },
        vec![],
        vec![],
    );

    function_table.add_function_header(
        &Identifier {
            loc,
            name: "func2".to_string(),
        },
        vec![],
        vec![
            Parameter {
                loc,
                id: Some(Identifier {
                    loc,
                    name: "ret1".to_string(),
                }),
                ty: Type::Uint(256),
                ty_loc: None,
                indexed: false,
                readonly: false,
                infinite_size: false,
                recursive: false,
                annotation: None,
            },
            Parameter {
                loc,
                id: Some(Identifier {
                    loc,
                    name: "ret2".to_string(),
                }),
                ty: Type::Uint(256),
                ty_loc: None,
                indexed: false,
                readonly: false,
                infinite_size: false,
                recursive: false,
                annotation: None,
            },
        ],
    );

    let expr = pt::YulExpression::FunctionCall(Box::new(YulFunctionCall {
        loc,
        id: Identifier {
            loc,
            name: "not".to_string(),
        },
        arguments: vec![pt::YulExpression::FunctionCall(Box::new(YulFunctionCall {
            loc,
            id: Identifier {
                loc,
                name: "pop".to_string(),
            },
            arguments: vec![pt::YulExpression::NumberLiteral(
                loc,
                "23".to_string(),
                "".to_string(),
                None,
            )],
        }))],
    }));

    let _ = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(!ns.diagnostics.is_empty());
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "builtin function 'pop' returns nothing"
    );
    ns.diagnostics = Diagnostics::default();

    let expr = pt::YulExpression::FunctionCall(Box::new(YulFunctionCall {
        loc,
        id: Identifier {
            loc,
            name: "not".to_string(),
        },
        arguments: vec![pt::YulExpression::FunctionCall(Box::new(YulFunctionCall {
            loc,
            id: Identifier {
                loc,
                name: "func1".to_string(),
            },
            arguments: vec![],
        }))],
    }));

    let _ = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(!ns.diagnostics.is_empty());
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "function 'func1' returns nothing"
    );
    ns.diagnostics = Diagnostics::default();

    let expr = pt::YulExpression::FunctionCall(Box::new(YulFunctionCall {
        loc,
        id: Identifier {
            loc,
            name: "not".to_string(),
        },
        arguments: vec![pt::YulExpression::FunctionCall(Box::new(YulFunctionCall {
            loc,
            id: Identifier {
                loc,
                name: "func2".to_string(),
            },
            arguments: vec![],
        }))],
    }));

    let _ = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(!ns.diagnostics.is_empty());
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "function 'func2' has multiple returns and cannot be used in this scope"
    );
}

#[test]
fn test_member_access() {
    let mut context = ExprContext {
        contract_no: Some(0),
        function_no: Some(0),
        ..Default::default()
    };
    context.enter_scope();

    let mut symtable = Symtable::default();
    let mut function_table = FunctionsTable::new(0);
    let mut ns = Namespace::new(Target::EVM);
    let loc = Loc::File(0, 2, 3);

    let mut contract = ast::Contract::new(
        &pt::Identifier {
            name: "test".into(),
            loc: pt::Loc::Builtin,
        },
        ContractTy::Contract(loc),
        vec![],
        loc,
    );
    contract.variables.push(Variable {
        tags: vec![],
        name: "var1".to_string(),
        loc,
        ty: Type::Bool,
        visibility: Visibility::Public(None),
        constant: false,
        immutable: false,
        initializer: None,
        assigned: false,
        read: false,
        storage_type: None,
    });

    ns.contracts.push(contract);

    ns.variable_symbols.insert(
        (0, Some(0), "var1".to_string()),
        Symbol::Variable(loc, Some(0), 0),
    );

    let expr = pt::YulExpression::SuffixAccess(
        loc,
        Box::new(pt::YulExpression::BoolLiteral(loc, true, None)),
        Identifier {
            loc,
            name: "pineapple".to_string(),
        },
    );

    let res = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(res.is_err());
    assert_eq!(ns.diagnostics.len(), 1);
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "the provided suffix is not allowed in yul"
    );
    ns.diagnostics = Diagnostics::default();

    let expr = pt::YulExpression::SuffixAccess(
        loc,
        Box::new(pt::YulExpression::BoolLiteral(loc, true, None)),
        Identifier {
            loc,
            name: "slot".to_string(),
        },
    );

    let res = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(res.is_err());
    assert_eq!(ns.diagnostics.len(), 1);
    assert_eq!(
        ns.diagnostics.iter().next().unwrap().message,
        "the given expression does not support '.slot' suffixes"
    );
    ns.diagnostics = Diagnostics::default();

    let expr = pt::YulExpression::SuffixAccess(
        loc,
        Box::new(pt::YulExpression::Variable(Identifier {
            loc,
            name: "var1".to_string(),
        })),
        Identifier {
            loc,
            name: "slot".to_string(),
        },
    );

    let res = resolve_yul_expression(
        &expr,
        &mut context,
        &mut symtable,
        &mut function_table,
        &mut ns,
    );
    assert!(res.is_ok());
    assert!(ns.diagnostics.is_empty());
    assert_eq!(
        YulExpression::SuffixAccess(
            loc,
            Box::new(YulExpression::StorageVariable(loc, Type::Bool, 0, 0)),
            YulSuffix::Slot
        ),
        res.unwrap()
    );
}

#[test]
fn test_check_types() {
    let loc = Loc::File(0, 0, 0);
    let expr = YulExpression::SolidityLocalVariable(
        loc,
        Type::Uint(32),
        Some(StorageLocation::Storage(loc)),
        0,
    );

    let mut context = ExprContext::default();
    context.enter_scope();

    let mut ns = Namespace::new(Target::EVM);
    let mut contract = ast::Contract::new(
        &pt::Identifier {
            name: "test".into(),
            loc: pt::Loc::Builtin,
        },
        ContractTy::Contract(loc),
        vec![],
        loc,
    );
    contract.variables.push(Variable {
        tags: vec![],
        name: "var1".to_string(),
        loc,
        ty: Type::Bool,
        visibility: Visibility::Public(None),
        constant: true,
        immutable: false,
        initializer: None,
        assigned: false,
        read: false,
        storage_type: None,
    });
    ns.contracts.push(contract);
    let mut symtable = Symtable::default();
    symtable.add(
        &Identifier {
            loc,
            name: "name".to_string(),
        },
        Type::Uint(32),
        &mut ns,
        VariableInitializer::Solidity(None),
        VariableUsage::YulLocalVariable,
        None,
        &mut context,
    );
    let res = check_type(&expr, &mut context, &mut ns, &mut symtable);
    assert!(res.is_some());
    assert_eq!(
        res.unwrap().message,
        "Storage variables must be accessed with '.slot' or '.offset'"
    );

    let expr = YulExpression::StorageVariable(loc, Type::Int(16), 0, 0);
    let res = check_type(&expr, &mut context, &mut ns, &mut symtable);
    assert!(res.is_some());
    assert_eq!(
        res.unwrap().message,
        "Storage variables must be accessed with '.slot' or '.offset'"
    );

    let expr = YulExpression::SolidityLocalVariable(
        loc,
        Type::Array(Box::new(Type::Int(8)), vec![ArrayLength::Dynamic]),
        Some(StorageLocation::Calldata(loc)),
        0,
    );
    let res = check_type(&expr, &mut context, &mut ns, &mut symtable);
    assert!(res.is_some());
    assert_eq!(res.unwrap().message, "Calldata arrays must be accessed with '.offset', '.length' and the 'calldatacopy' function");

    let expr = YulExpression::StringLiteral(loc, vec![0, 255, 20], Type::Uint(256));
    let res = check_type(&expr, &mut context, &mut ns, &mut symtable);
    assert!(res.is_none());
}

#[test]
fn test_check_types_resolved() {
    let file = r#"
contract testTypes {
    uint256 b;
    function testAsm() public pure {
        assembly {
            {
                let x := 0
                b.offset := add(x, 2)
            }
        }
    }
}
    "#;

    let ns = parse(file);
    assert!(ns
        .diagnostics
        .contains_message("cannot assign a value to offset"));

    let file = r#"
    contract testTypes {
    uint256 b;
    function testAsm(uint[] calldata vl) public pure {
        assembly {
            {
                let x := 0
                vl.length := add(x, 2)
            }
        }
    }
}
    "#;

    let ns = parse(file);
    assert!(ns
        .diagnostics
        .contains_message("assignment to length is not implemented. If there is need for this feature, please file a Github issue at https://github.com/hyperledger-solang/solang/issues"));

    let file = r#"
contract testTypes {
    uint256 b;
    function testAsm(uint[] calldata vl) public pure {
        assembly {
            {
                let x := 0
                pop(x) := add(x, 2)
            }
        }
    }
}
    "#;

    let ns = parse(file);
    assert!(ns.diagnostics.contains_message(
        r#"unrecognised token ':=', expected "abstract", "address", "anonymous", "as", "assembly", "bool", "break", "byte", "bytes", "calldata", "catch", "constant", "constructor", "continue", "contract", "do", "else", "emit", "enum", "event", "external", "fallback", "for", "function", "if", "immutable", "import", "indexed", "interface", "internal", "is", "leave", "let", "library", "mapping", "memory", "modifier", "new", "override", "payable", "pragma", "private", "public", "pure", "receive", "return", "returns", "revert", "storage", "string", "struct", "switch", "throw", "try", "unchecked", "using", "view", "virtual", "while", "{", "}", Int, Uint, identifier"#
    ));

    let file = r#"
uint256 constant b = 1;
contract testTypes {
    function testAsm(uint[] calldata vl) public pure {
        assembly {
            {
                let x := 0
                b := add(x, 2)
            }
        }
    }
}
    "#;

    let ns = parse(file);
    assert!(ns
        .diagnostics
        .contains_message("cannot assigned a value to a constant"));

    let file = r#"
contract testTypes {
    struct test {
        uint a;
        uint b;
    }

    test tt1;
    function testAsm(uint[] calldata vl) public view {
        test storage tt2 = tt1;
        assembly {
            {
                let x := 0
                tt1.slot := add(x, 2)
            }
        }
    }
}
    "#;

    let ns = parse(file);
    assert!(ns
        .diagnostics
        .contains_message("cannot assign to slot of storage variable"));

    let file = r#"
    contract testTypes {
    struct test {
        uint a;
        uint b;
    }

    test tt1;
    function testAsm(uint[] calldata vl) public view {
        test storage tt2 = tt1;
        assembly {
            {
                let x := 0
                tt2.slot := add(x, 2)
            }
        }
    }
}
    "#;
    let ns = parse(file);
    assert_eq!(ns.diagnostics.len(), 2);
    assert!(ns
        .diagnostics
        .contains_message("found contract 'testTypes'"));
    assert!(ns
        .diagnostics
        .contains_message("function parameter 'vl' is unused"));

    let file = r#"
    contract testTypes {
    struct test {
        uint a;
        uint b;
    }

    test tt1;
    function testAsm(uint[] calldata vl) public pure {
        test storage tt2 = tt1;
        assembly {
            {
                let x := 0
                tt2 := add(x, 2)
            }
        }
    }
}   "#;

    let ns = parse(file);
    assert!(ns.diagnostics.contains_message(
        "storage variables cannot be assigned any value in assembly. You may use 'sstore()'"
    ));

    let file = r#"
contract testTypes {
    struct test {
        uint a;
        uint b;
    }

    test tt1;
    function testAsm(uint[] calldata vl) public pure {
        test storage tt2 = tt1;
        assembly {
            {
                let x := 0
                let y := add(tt2, 2)
            }
        }
    }
}    "#;
    let ns = parse(file);
    assert!(ns
        .diagnostics
        .contains_message("Storage variables must be accessed with '.slot' or '.offset'"));

    let file = r#"
contract testTypes {
    function testAsm(uint[] calldata vl) public pure {
        assembly {
            {
                let x := 4
                let y := add(vl, x)
            }
        }
    }
}    "#;

    let ns = parse(file);
    assert!(ns.diagnostics.contains_message(
        "Calldata arrays must be accessed with '.offset', '.length' and the 'calldatacopy' function"
    ));
}

#[test]
fn test_member_access_resolved() {
    let file = r#"
contract testTypes {
    struct test {
        uint a;
        uint b;
    }
    test tt1;
    function testAsm(uint[] calldata vl) public pure {
        test storage tt2 = tt1;
        assembly {
            {
                let x := tt1.slot.length
               // let y := tt2.length
            }
        }
    }
}    "#;

    let ns = parse(file);
    assert!(ns
        .diagnostics
        .contains_message("there cannot be multiple suffixes to a name"));

    let file = r#"
contract testTypes {
    struct test {
        uint a;
        uint b;
    }
    test tt1;
    function testAsm(uint[] calldata vl) public pure {
        test storage tt2 = tt1;
        assembly {
            {
                //let x := tt1.slot.length
               let y := tt2.length
            }
        }
    }
}
    "#;

    let ns = parse(file);
    assert!(ns
        .diagnostics
        .contains_message("state variables only support '.slot' and '.offset'"));

    let file = r#"
contract testTypes {
    struct test {
        uint a;
        uint b;
    }
    test tt1;
    function bar(uint a) public pure returns (uint) {
        return a + 3;
    }

    function testAsm(uint[] calldata vl) public pure {
        test storage tt2 = tt1;
        function(uint) internal pure returns (uint) func = bar;
        assembly {
            {
               let y := func.length
            }
        }
    }
}    "#;

    let ns = parse(file);
    assert!(ns
        .diagnostics
        .contains_message("only variables of type external function pointer support suffixes"));

    let file = r#"
contract testTypes {
    struct test {
        uint a;
        uint b;
    }
    test tt1;
    function bar(uint a) public pure returns (uint) {
        return a + 3;
    }

    function testAsm(uint[] calldata vl) public pure {
        test storage tt2 = tt1;
        function(uint) external pure returns (uint) func = this.bar;
        assembly {
            {
               let y := func.length
            }
        }
    }
}    "#;

    let ns = parse(file);
    assert!(ns.diagnostics.contains_message(
        "variables of type function pointer only support '.selector' and '.address' suffixes"
    ));

    let file = r#"
contract testTypes {
    function testAsm(uint[] calldata vl) public pure {
        assembly {
            {
               let y := vl.selector
            }
        }
    }
}    "#;
    let ns = parse(file);
    assert!(ns
        .diagnostics
        .contains_message("calldata variables only support '.offset' and '.length'"));

    let file = r#"
contract testTypes {
    uint constant cte = 5;
    function testAsm(uint[] calldata vl) public pure {
        assembly {
            {
               let y := cte.offset
            }
        }
    }
}
    "#;
    let ns = parse(file);
    assert!(ns.diagnostics.contains_message(
        "the suffixes .offset and .slot can only be used in non-constant storage variables"
    ));

    let file = r#"
contract testTypes {
    uint constant cte = 5;
    function testAsm(uint[] calldata vl) public pure {
        assembly {
            {
               let y := cte.dada
            }
        }
    }
}    "#;

    let ns = parse(file);
    assert!(ns
        .diagnostics
        .contains_message("the provided suffix is not allowed in yul"));
}

#[test]
fn test_check_argument() {
    let file = r#"
contract testTypes {
    function testAsm(uint[] calldata vl) public pure {
        assembly {
            {
                let a1 : u32 := 5
                let b1 : s32 := 6
                let c1 : u256 := 7
                let d1 : s256 := 8
                let f1 : u256 := 9

                let ret1 := testPars(a1, b1, c1, d1, f1)
                function testPars(a : s32, b:u32, c:u128, d:s128, f : bool) -> ret{
                    ret := add(a, b)
                    ret := add(c, ret)
                    ret := add(d, ret)
                    if f {
                        ret := 0
                    }
                }
            }
        }
    }
}
    "#;

    let ns = parse(file);
    assert!(ns
        .diagnostics
        .contains_message("32 bit unsigned integer may not fit into 32 bit signed integer"));

    assert!(ns
        .diagnostics
        .contains_message("signed integer may not be correctly represented as unsigned integer"));

    assert!(ns
        .diagnostics
        .contains_message("256 bit type may not fit into 128 bit type"));

    assert!(ns
        .diagnostics
        .contains_message("256 bit type may not fit into 128 bit type"));

    assert!(ns
        .diagnostics
        .contains_message("Truncating argument to bool"));
}

#[test]
fn address_member_access() {
    let file = r#"
contract C {
    // Assigns a new selector and address to the return variable @fun
    function combineToFunctionPointer(address newAddress, uint newSelector) public pure returns (function() external fun) {
        assembly {
            fun.selector := newSelector
            fun.address  := newAddress
        }
    }
}
    "#;

    let ns = parse(file);
    assert_eq!(ns.diagnostics.len(), 1);
    assert!(ns.diagnostics.contains_message("found contract 'C'"));
}

#[test]
fn test_invalid_suffix() {
    let file = r#"
contract test {
    function testing() public pure returns (int) {
        int[4] memory vec = [int(1), 2, 3, 4];
        assembly {
            let x := vec.slot
            if lt(x, 0) {
                stop()
            }
        }

        return vec[1];
    }
}
    "#;
    let ns = parse(file);
    assert_eq!(ns.diagnostics.len(), 2);
    assert!(ns.diagnostics.contains_message("found contract 'test'"));
    assert!(ns
        .diagnostics
        .contains_message("the given expression does not support '.slot' suffixes"));

    let file = r#"
    contract test {
    struct tts {
        int a;
        string b;
    }
    function testing(tts calldata strcl) public pure returns (int) {
        assembly {
            let x := strcl.slot
        }

        return strcl.a;
    }
}
    "#;
    let ns = parse(file);
    assert_eq!(ns.diagnostics.len(), 2);
    assert!(ns.diagnostics.contains_message("found contract 'test'"));
    assert!(ns
        .diagnostics
        .contains_message("the given expression does not support '.slot' suffixes"));

    let file = r#"
    contract test {

    function testing() public pure returns (int) {
        int c = 8;
        assembly {
            let x := c.offset
        }

        return c;
    }
}
    "#;
    let ns = parse(file);
    assert_eq!(ns.diagnostics.len(), 2);
    assert!(ns.diagnostics.contains_message("found contract 'test'"));
    assert!(ns
        .diagnostics
        .contains_message("the given expression does not support '.offset' suffixes"));
}

#[test]
fn call_data_variables_error() {
    let file = r#"
contract testTypes {
    function testAsm(uint[3][] calldata vl) public pure {
        assembly {
            {
               let y := vl.selector
            }
        }
    }
}    "#;
    let ns = parse(file);
    assert!(ns
        .diagnostics
        .contains_message("calldata variables only support '.offset' and '.length'"));

    let file = r#"
contract testTypes {
    function testAsm(uint[][3] calldata vl) public pure {
        assembly {
            {
               let y := vl.length
            }
        }
    }
}  "#;

    let ns = parse(file);
    assert!(ns
        .diagnostics
        .contains_message("the given expression does not support '.length' suffixes"));
}

#[test]
fn external_function() {
    let file = r#"
    contract test {

    function testing(int a) public pure returns (int) {
        return a + 4;
    }

    function (int) external returns (int) sPtr = this.testing;

    function runTest() public returns (int) {
        assembly {
            let t := sPtr.address
        }
        return sPtr(3);
    }
}    "#;

    let ns = parse(file);
    assert_eq!(ns.diagnostics.len(), 2);
    assert!(ns.diagnostics.contains_message("found contract 'test'"));
    assert!(ns
        .diagnostics
        .contains_message("state variables only support '.slot' and '.offset'"));

    let file = r#"
    contract test {

    function testing(int a) public pure returns (int) {
        return a + 4;
    }

    function runTest() public returns (int) {
    function (int) external returns (int) sPtr = this.testing;
        assembly {
            let t := sPtr.address
        }
        return sPtr(3);
    }
}   "#;
    let ns = parse(file);
    assert_eq!(ns.diagnostics.len(), 2);
    assert!(ns.diagnostics.contains_message("found contract 'test'"));
    assert!(ns
        .diagnostics
        .contains_message("yul variable 't' has never been read"));
}

#[test]
fn unsupported_builtin() {
    let file = r#"
contract foo {
       function testing() view public {
       assembly {
           let f := gaslimit()
       }
    }
}
    "#;
    let mut cache = FileResolver::default();
    cache.set_file_contents("test.sol", file.to_string());

    let ns = parse_and_resolve(OsStr::new("test.sol"), &mut cache, Target::Solana);

    assert!(ns.diagnostics.contains_message("builtin 'gaslimit' is not available for target Solana. Please, open a GitHub issue at https://github.com/hyperledger-solang/solang/issues if there is need to support this function"));

    let file = r#"
contract foo {
       function testing() view public {
       assembly {
           let f := coinbase()
       }
    }
}
    "#;

    let mut cache = FileResolver::default();
    cache.set_file_contents("test.sol", file.to_string());

    let ns = parse_and_resolve(
        OsStr::new("test.sol"),
        &mut cache,
        Target::Polkadot {
            address_length: 32,
            value_length: 16,
        },
    );

    assert!(ns.diagnostics.contains_message("builtin 'coinbase' is not available for target Polkadot. Please, open a GitHub issue at https://github.com/hyperledger-solang/solang/issues if there is need to support this function"));

    let file = r#"
    contract foo {
       function testing() public {
       assembly {
           log0(1, 2)
       }
    }
}
    "#;

    let mut cache = FileResolver::default();
    cache.set_file_contents("test.sol", file.to_string());

    let ns = parse_and_resolve(OsStr::new("test.sol"), &mut cache, Target::Solana);

    assert!(ns.diagnostics.contains_message("builtin 'log0' is not available for target Solana. Please, open a GitHub issue at https://github.com/hyperledger-solang/solang/issues if there is need to support this function"));
}