neo-decompiler 0.11.0

Neo N3 NEF decompiler: parse, disassemble, lift bytecode to high-level pseudocode and C# skeletons, with a CLI, JSON reports, and optional WebAssembly bindings.
Documentation 
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use super::super::super::*;

#[test]
fn rewrite_switch_statements_rewrites_long_guarded_goto_chains() {
    let mut statements = vec![
        "let loc0 = input;".to_string(),
        "let t0 = loc0 == 0;".to_string(),
        "if t0 { goto label_case_0; }".to_string(),
        "let t1 = loc0 == 1;".to_string(),
        "if t1 { goto label_case_1; }".to_string(),
        "let t2 = loc0 == 2;".to_string(),
        "if t2 { goto label_case_2; }".to_string(),
        "let t3 = loc0 == 3;".to_string(),
        "if t3 { goto label_case_3; }".to_string(),
        "let t4 = loc0 == 4;".to_string(),
        "if t4 { goto label_case_4; }".to_string(),
        "let t5 = loc0 == 5;".to_string(),
        "if t5 { goto label_case_5; }".to_string(),
        "let t6 = loc0 == 6;".to_string(),
        "if t6 { goto label_case_6; }".to_string(),
        "let t7 = loc0 == 7;".to_string(),
        "if !t7 {".to_string(),
        "    goto label_default;".to_string(),
        "    label_case_0:".to_string(),
        "    return 0;".to_string(),
        "    label_case_1:".to_string(),
        "    return 1;".to_string(),
        "    label_case_2:".to_string(),
        "    return 2;".to_string(),
        "    label_case_3:".to_string(),
        "    return 3;".to_string(),
        "    label_case_4:".to_string(),
        "    return 4;".to_string(),
        "    label_case_5:".to_string(),
        "    return 5;".to_string(),
        "    label_case_6:".to_string(),
        "    return 6;".to_string(),
        "}".to_string(),
        "return 7;".to_string(),
        "label_default:".to_string(),
        "return 99;".to_string(),
    ];

    HighLevelEmitter::rewrite_switch_statements(&mut statements);

    assert!(statements.iter().any(|line| line.trim() == "switch loc0 {"));
    assert!(statements.iter().any(|line| line.trim() == "case 0 {"));
    assert!(statements.iter().any(|line| line.trim() == "case 7 {"));
    assert!(statements.iter().any(|line| line.trim() == "default {"));
    assert!(!statements
        .iter()
        .any(|line| line.trim() == "if t0 { goto label_case_0; }"));
}

#[test]
fn rewrite_switch_statements_rewrites_guarded_chain_with_else_embedded_default_label() {
    let mut statements = vec![
        "let loc0 = input;".to_string(),
        "let t0 = loc0 == 0;".to_string(),
        "if t0 { goto label_case_0; }".to_string(),
        "let t1 = loc0 == 1;".to_string(),
        "if t1 { goto label_case_1; }".to_string(),
        "let t2 = loc0 == 2;".to_string(),
        "if t2 { goto label_case_2; }".to_string(),
        "let t3 = loc0 == 3;".to_string(),
        "if t3 { goto label_case_3; }".to_string(),
        "let t4 = loc0 == 4;".to_string(),
        "if t4 { goto label_case_4; }".to_string(),
        "let t5 = loc0 == 5;".to_string(),
        "if !t5 {".to_string(),
        "    goto label_default;".to_string(),
        "    label_case_0:".to_string(),
        "    do0;".to_string(),
        "    goto label_end;".to_string(),
        "    label_case_1:".to_string(),
        "    do1;".to_string(),
        "    goto label_end;".to_string(),
        "    label_case_2:".to_string(),
        "    do2;".to_string(),
        "    goto label_end;".to_string(),
        "    label_case_3:".to_string(),
        "    do3;".to_string(),
        "    goto label_end;".to_string(),
        "    label_case_4:".to_string(),
        "    do4;".to_string(),
        "    goto label_end;".to_string(),
        "}".to_string(),
        "else {".to_string(),
        "    do5;".to_string(),
        "    goto label_end;".to_string(),
        "    label_default:".to_string(),
        "    do_default;".to_string(),
        "}".to_string(),
        "label_end:".to_string(),
        "return;".to_string(),
    ];

    HighLevelEmitter::rewrite_switch_statements(&mut statements);

    assert!(statements.iter().any(|line| line.trim() == "switch loc0 {"));
    assert!(statements.iter().any(|line| line.trim() == "case 0 {"));
    assert!(statements.iter().any(|line| line.trim() == "case 5 {"));
    assert!(statements.iter().any(|line| line.trim() == "default {"));
    assert!(statements.iter().any(|line| line.trim() == "do5;"));
    assert!(statements.iter().any(|line| line.trim() == "do_default;"));
    assert!(
        !statements.iter().any(|line| line.trim() == "else {"),
        "switch rewrite should not leave dangling else wrappers in case bodies"
    );
}

#[test]
fn rewrite_switch_statements_rewrites_guarded_chain_with_else_case_and_external_default_label() {
    let mut statements = vec![
        "let loc0 = input;".to_string(),
        "let t0 = loc0 == 0;".to_string(),
        "if t0 { goto label_case_0; }".to_string(),
        "let t1 = loc0 == 1;".to_string(),
        "if t1 { goto label_case_1; }".to_string(),
        "let t2 = loc0 == 2;".to_string(),
        "if t2 { goto label_case_2; }".to_string(),
        "let t3 = loc0 == 3;".to_string(),
        "if t3 { goto label_case_3; }".to_string(),
        "let t4 = loc0 == 4;".to_string(),
        "if t4 { goto label_case_4; }".to_string(),
        "let t5 = loc0 == 5;".to_string(),
        "if !t5 {".to_string(),
        "    goto label_default;".to_string(),
        "    label_case_0:".to_string(),
        "    do0;".to_string(),
        "    goto label_end;".to_string(),
        "    label_case_1:".to_string(),
        "    do1;".to_string(),
        "    goto label_end;".to_string(),
        "    label_case_2:".to_string(),
        "    do2;".to_string(),
        "    goto label_end;".to_string(),
        "    label_case_3:".to_string(),
        "    do3;".to_string(),
        "    goto label_end;".to_string(),
        "    label_case_4:".to_string(),
        "    do4;".to_string(),
        "    goto label_end;".to_string(),
        "}".to_string(),
        "else {".to_string(),
        "    do5;".to_string(),
        "    goto label_end;".to_string(),
        "}".to_string(),
        "label_default:".to_string(),
        "do_default;".to_string(),
        "label_end:".to_string(),
        "return;".to_string(),
    ];

    HighLevelEmitter::rewrite_switch_statements(&mut statements);

    assert!(statements.iter().any(|line| line.trim() == "switch loc0 {"));
    assert!(statements.iter().any(|line| line.trim() == "case 0 {"));
    assert!(statements.iter().any(|line| line.trim() == "case 5 {"));
    assert!(statements.iter().any(|line| line.trim() == "default {"));
    assert!(statements.iter().any(|line| line.trim() == "do5;"));
    assert!(statements.iter().any(|line| line.trim() == "do_default;"));
    assert!(
        !statements.iter().any(|line| line.trim() == "else {"),
        "switch rewrite should not leave dangling else wrappers in case bodies"
    );
}