mirror of https://github.com/rust-lang/rust.git
135 lines
4.0 KiB
Rust
135 lines
4.0 KiB
Rust
//@ compile-flags:-g
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// === GDB TESTS ===================================================================================
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// gdb-command:run
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// gdb-command:print simple
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// gdb-check:$1 = struct_with_destructor::WithDestructor {x: 10, y: 20}
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// gdb-command:print noDestructor
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// gdb-check:$2 = struct_with_destructor::NoDestructorGuarded {a: struct_with_destructor::NoDestructor {x: 10, y: 20}, guard: -1}
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// gdb-command:print withDestructor
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// gdb-check:$3 = struct_with_destructor::WithDestructorGuarded {a: struct_with_destructor::WithDestructor {x: 10, y: 20}, guard: -1}
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// gdb-command:print nested
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// gdb-check:$4 = struct_with_destructor::NestedOuter {a: struct_with_destructor::NestedInner {a: struct_with_destructor::WithDestructor {x: 7890, y: 9870}}}
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// === LLDB TESTS ==================================================================================
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// lldb-command:run
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// lldb-command:v simple
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// lldb-check:[...] { x = 10 y = 20 }
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// lldb-command:v noDestructor
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// lldb-check:[...] { a = { x = 10 y = 20 } guard = -1 }
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// lldb-command:v withDestructor
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// lldb-check:[...] { a = { x = 10 y = 20 } guard = -1 }
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// lldb-command:v nested
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// lldb-check:[...] { a = { a = { x = 7890 y = 9870 } } }
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#![allow(unused_variables)]
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#![feature(omit_gdb_pretty_printer_section)]
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#![omit_gdb_pretty_printer_section]
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struct NoDestructor {
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x: i32,
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y: i64
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}
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struct WithDestructor {
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x: i32,
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y: i64
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}
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impl Drop for WithDestructor {
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fn drop(&mut self) {}
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}
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struct NoDestructorGuarded {
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a: NoDestructor,
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guard: i64
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}
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struct WithDestructorGuarded {
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a: WithDestructor,
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guard: i64
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}
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struct NestedInner {
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a: WithDestructor
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}
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impl Drop for NestedInner {
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fn drop(&mut self) {}
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}
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struct NestedOuter {
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a: NestedInner
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}
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// The compiler adds a 'destructed' boolean field to structs implementing Drop. This field is used
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// at runtime to prevent drop() to be executed more than once.
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// This field must be incorporated by the debug info generation. Otherwise the debugger assumes a
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// wrong size/layout for the struct.
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fn main() {
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let simple = WithDestructor { x: 10, y: 20 };
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let noDestructor = NoDestructorGuarded {
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a: NoDestructor { x: 10, y: 20 },
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guard: -1
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};
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// If the destructor flag field is not incorporated into the debug info for 'WithDestructor'
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// then the debugger will have an invalid offset for the field 'guard' and thus should not be
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// able to read its value correctly (dots are padding bytes, D is the boolean destructor flag):
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//
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// 64 bit
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//
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// NoDestructorGuarded = 0000....00000000FFFFFFFF
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// <--------------><------>
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// NoDestructor guard
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//
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//
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// withDestructorGuarded = 0000....00000000D.......FFFFFFFF
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// <--------------><------> // How debug info says it is
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// WithDestructor guard
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//
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// <----------------------><------> // How it actually is
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// WithDestructor guard
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//
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// 32 bit
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//
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// NoDestructorGuarded = 000000000000FFFFFFFF
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// <----------><------>
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// NoDestructor guard
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//
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//
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// withDestructorGuarded = 000000000000D...FFFFFFFF
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// <----------><------> // How debug info says it is
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// WithDestructor guard
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//
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// <--------------><------> // How it actually is
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// WithDestructor guard
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//
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let withDestructor = WithDestructorGuarded {
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a: WithDestructor { x: 10, y: 20 },
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guard: -1
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};
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// expected layout (64 bit) = xxxx....yyyyyyyyD.......D...
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// <--WithDestructor------>
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// <-------NestedInner-------->
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// <-------NestedOuter-------->
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let nested = NestedOuter { a: NestedInner { a: WithDestructor { x: 7890, y: 9870 } } };
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zzz(); // #break
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}
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fn zzz() {()}
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