014026d1a7
[debuginfo] Emit associated type bindings in trait object type names. This PR updates debuginfo type name generation for trait objects to include associated type bindings and auto trait bounds -- so that, for example, the debuginfo type name of `&dyn Iterator<Item=Foo>` and `&dyn Iterator<Item=Bar>` don't both map to just `&dyn Iterator` anymore. The following table shows examples of debuginfo type names before and after the PR: | type | before | after | |------|---------|-------| | `&dyn Iterator<Item=u32>>` | `&dyn Iterator` | `&dyn Iterator<Item=u32>` | | `&(dyn Iterator<Item=u32>> + Sync)` | `&dyn Iterator` | `&(dyn Iterator<Item=u32> + Sync)` | | `&(dyn SomeTrait<bool, i8, Bar=u32>> + Send)` | `&dyn SomeTrait<bool, i8>` | `&(dyn SomeTrait<bool, i8, Bar=u32>> + Send)` | For targets that need C++-like type names, we use `assoc$<Item,u32>` instead of `Item=u32`: | type | before | after | |------|---------|-------| | `&dyn Iterator<Item=u32>>` | `ref$<dyn$<Iterator> >` | `ref$<dyn$<Iterator<assoc$<Item,u32> > > >` | | `&(dyn Iterator<Item=u32>> + Sync)` | `ref$<dyn$<Iterator> >` | `ref$<dyn$<Iterator<assoc$<Item,u32> >,Sync> >` | | `&(dyn SomeTrait<bool, i8, Bar=u32>> + Send)` | `ref$<dyn$<SomeTrait<bool, i8> > >` | `ref$<dyn$<SomeTrait<bool,i8,assoc$<Bar,u32> > >,Send> >` | The PR also adds self-profiling measurements for debuginfo type name generation (re. https://github.com/rust-lang/rust/issues/86431). It looks like the compiler spends up to 0.5% of its time in that task, so the potential for optimizing it via caching seems limited. However, the perf run also shows [the biggest regression](https://perf.rust-lang.org/detailed-query.html?commit=585e91c718b0b2c5319e1fffd0ff1e62aaf7ccc2&base_commit=b9197978a90be6f7570741eabe2da175fec75375&benchmark=tokio-webpush-simple-debug&run_name=incr-unchanged) in a test case that does not even invoke the code in question. This suggests that the length of the names we generate here can affect performance by influencing how much data the linker has to copy around. Fixes https://github.com/rust-lang/rust/issues/86134.
187 lines
6.1 KiB
Rust
187 lines
6.1 KiB
Rust
// ignore-freebsd: gdb package too new
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// only-cdb // "Temporarily" ignored on GDB/LLDB due to debuginfo tests being disabled, see PR 47155
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// ignore-android: FIXME(#10381)
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// compile-flags:-g
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// min-gdb-version: 7.7
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// min-lldb-version: 310
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// min-cdb-version: 10.0.18317.1001
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// === GDB TESTS ===================================================================================
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// gdb-command: run
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// gdb-command: print slice
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// gdb-check:$1 = &[i32](len: 4) = {0, 1, 2, 3}
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// gdb-command: print vec
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// gdb-check:$2 = Vec<u64, alloc::alloc::Global>(len: 4, cap: [...]) = {4, 5, 6, 7}
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// gdb-command: print str_slice
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// gdb-check:$3 = "IAMA string slice!"
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// gdb-command: print string
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// gdb-check:$4 = "IAMA string!"
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// gdb-command: print some
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// gdb-check:$5 = Some = {8}
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// gdb-command: print none
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// gdbg-check:$6 = None
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// gdbr-check:$6 = core::option::Option::None
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// gdb-command: print os_string
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// gdb-check:$7 = "IAMA OS string 😃"
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// gdb-command: print some_string
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// gdb-check:$8 = Some = {"IAMA optional string!"}
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// gdb-command: set print length 5
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// gdb-command: print some_string
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// gdb-check:$8 = Some = {"IAMA "...}
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// === LLDB TESTS ==================================================================================
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// lldb-command: run
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// lldb-command: print slice
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// lldb-check:[...]$0 = &[0, 1, 2, 3]
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// lldb-command: print vec
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// lldb-check:[...]$1 = vec![4, 5, 6, 7]
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// lldb-command: print str_slice
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// lldb-check:[...]$2 = "IAMA string slice!"
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// lldb-command: print string
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// lldb-check:[...]$3 = "IAMA string!"
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// lldb-command: print some
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// lldb-check:[...]$4 = Some(8)
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// lldb-command: print none
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// lldb-check:[...]$5 = None
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// lldb-command: print os_string
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// lldb-check:[...]$6 = "IAMA OS string 😃"[...]
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// === CDB TESTS ==================================================================================
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// cdb-command: g
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// cdb-command: dx slice,d
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// cdb-check:slice,d : { len=4 } [Type: slice$<i32>]
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// cdb-check: [len] : 4 [Type: [...]]
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// cdb-check: [0] : 0 [Type: int]
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// cdb-check: [1] : 1 [Type: int]
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// cdb-check: [2] : 2 [Type: int]
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// cdb-check: [3] : 3 [Type: int]
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// cdb-command: dx vec,d
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// cdb-check:vec,d [...] : { len=4 } [Type: [...]::Vec<u64,alloc::alloc::Global>]
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// cdb-check: [len] : 4 [Type: [...]]
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// cdb-check: [capacity] : [...] [Type: [...]]
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// cdb-check: [0] : 4 [Type: unsigned __int64]
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// cdb-check: [1] : 5 [Type: unsigned __int64]
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// cdb-check: [2] : 6 [Type: unsigned __int64]
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// cdb-check: [3] : 7 [Type: unsigned __int64]
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// cdb-command: dx str_slice
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// cdb-check:str_slice : "IAMA string slice!" [Type: str]
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// cdb-command: dx string
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// cdb-check:string : "IAMA string!" [Type: [...]::String]
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// cdb-check: [<Raw View>] [Type: [...]::String]
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// cdb-check: [len] : 0xc [Type: [...]]
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// cdb-check: [capacity] : 0xc [Type: [...]]
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// cdb-command: dx -r2 string
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// cdb-check: [0] : 73 'I' [Type: char]
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// cdb-check: [1] : 65 'A' [Type: char]
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// cdb-check: [2] : 77 'M' [Type: char]
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// cdb-check: [3] : 65 'A' [Type: char]
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// cdb-check: [4] : 32 ' ' [Type: char]
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// cdb-check: [5] : 115 's' [Type: char]
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// cdb-check: [6] : 116 't' [Type: char]
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// cdb-check: [7] : 114 'r' [Type: char]
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// cdb-check: [8] : 105 'i' [Type: char]
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// cdb-check: [9] : 110 'n' [Type: char]
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// cdb-check: [10] : 103 'g' [Type: char]
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// cdb-check: [11] : 33 '!' [Type: char]
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// cdb-command: dx os_string
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// cdb-check:os_string : "IAMA OS string 😃" [Type: std::ffi::os_str::OsString]
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// cdb-check: [<Raw View>] [Type: std::ffi::os_str::OsString]
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// cdb-check: [chars] : "IAMA OS string 😃"
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// cdb-command: dx some
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// cdb-check:some : Some [Type: enum$<core::option::Option<i16> >]
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// cdb-check: [<Raw View>] [Type: enum$<core::option::Option<i16> >]
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// cdb-check: [variant] : Some
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// cdb-check: [+0x002] __0 : 8 [Type: short]
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// cdb-command: dx none
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// cdb-check:none : None [Type: enum$<core::option::Option<i64> >]
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// cdb-check: [<Raw View>] [Type: enum$<core::option::Option<i64> >]
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// cdb-check: [variant] : None
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// cdb-command: dx some_string
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// NOTE: cdb fails to interpret debug info of Option enums on i686.
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// cdb-check:some_string [Type: enum$<core::option::Option<alloc::string::String>, 1, [...], Some>]
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// cdb-command: dx linkedlist
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// cdb-check:linkedlist : { len=0x2 } [Type: alloc::collections::linked_list::LinkedList<i32>]
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// cdb-check: [<Raw View>] [Type: alloc::collections::linked_list::LinkedList<i32>]
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// cdb-check: [0x0] : 128 [Type: int]
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// cdb-check: [0x1] : 42 [Type: int]
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// cdb-command: dx vecdeque
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// cdb-check:vecdeque : { len=0x2 } [Type: alloc::collections::vec_deque::VecDeque<i32>]
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// cdb-check: [<Raw View>] [Type: alloc::collections::vec_deque::VecDeque<i32>]
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// cdb-check: [len] : 0x2
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// cdb-check: [capacity] : 0x8 [Type: unsigned [...]]
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// cdb-check: [0x0] : 90 [Type: int]
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// cdb-check: [0x1] : 20 [Type: int]
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#![allow(unused_variables)]
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use std::collections::{LinkedList, VecDeque};
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use std::ffi::OsString;
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fn main() {
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// &[]
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let slice: &[i32] = &[0, 1, 2, 3];
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// Vec
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let vec = vec![4u64, 5, 6, 7];
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// &str
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let str_slice = "IAMA string slice!";
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// String
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let string = "IAMA string!".to_string();
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// OsString
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let os_string = OsString::from("IAMA OS string \u{1F603}");
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// Option
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let some = Some(8i16);
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let none: Option<i64> = None;
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let some_string = Some("IAMA optional string!".to_owned());
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// LinkedList
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let mut linkedlist = LinkedList::new();
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linkedlist.push_back(42);
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linkedlist.push_front(128);
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// VecDeque
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let mut vecdeque = VecDeque::new();
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vecdeque.push_back(20);
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vecdeque.push_front(90);
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zzz(); // #break
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}
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fn zzz() { () }
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