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rust-lldb: "ValueError: Positive integer expected" trying to print regex::Captures #52185

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alex opened this issue Jul 9, 2018 · 0 comments
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rust-lldb: "ValueError: Positive integer expected" trying to print regex::Captures #52185

alex opened this issue Jul 9, 2018 · 0 comments

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@alex
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alex commented Jul 9, 2018

I'm in a frame of Rust code with a regex::Captures local:

frame #9: 0x00000001000095d1 dom-rooting`dom_rooting::parse_callgraph_call::he390b4fd9cb48a86(line="D 1 2") at main.rs:84
   81  	    let m = RE.captures(line)
   82  	        .expect(&format!("parse failure: {:?}", line));
   83
-> 84  	    return (m[1].parse().unwrap(), m[2].parse().unwrap());
   85  	}
   86
   87  	fn parse_callgraph(p: &Path) -> Callgraph {

I try to print m (the regex::Captures) and hilarity ensues:

(lldb) p m
Traceback (most recent call last):
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 99, in print_val
    is_tuple_like = False)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 220, in print_struct_val
    body = separator.join([render_child(idx) for idx in range(field_start_index, len(fields))])
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 213, in render_child
    return this + print_val(field_val.get_wrapped_value(), internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 132, in print_val
    is_tuple_like = True)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 220, in print_struct_val
    body = separator.join([render_child(idx) for idx in range(field_start_index, len(fields))])
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 213, in render_child
    return this + print_val(field_val.get_wrapped_value(), internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 115, in print_val
    return print_std_vec_val(val, internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 264, in print_std_vec_val
    internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 299, in print_array_of_values
    return ', '.join([render_element(i) for i in range(length)])
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 297, in render_element
    return print_val(element_val, internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 156, in print_val
    return print_val(lldb_val.GetChildAtIndex(discriminant_val), internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 132, in print_val
    is_tuple_like = True)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 220, in print_struct_val
    body = separator.join([render_child(idx) for idx in range(field_start_index, len(fields))])
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 213, in render_child
    return this + print_val(field_val.get_wrapped_value(), internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 112, in print_val
    return print_str_slice_val(val, internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 268, in print_str_slice_val
    return read_utf8_string(data_ptr, length)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 305, in read_utf8_string
    data = process.ReadMemory(ptr_val.as_integer(), byte_count, error)
  File "/Applications/Xcode.app/Contents/SharedFrameworks/LLDB.framework/Resources/Python/lldb/__init__.py", line 7184, in ReadMemory
    return _lldb.SBProcess_ReadMemory(self, *args)
ValueError: Positive integer expected
Traceback (most recent call last):
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 132, in print_val
    is_tuple_like = True)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 220, in print_struct_val
    body = separator.join([render_child(idx) for idx in range(field_start_index, len(fields))])
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 213, in render_child
    return this + print_val(field_val.get_wrapped_value(), internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 115, in print_val
    return print_std_vec_val(val, internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 264, in print_std_vec_val
    internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 299, in print_array_of_values
    return ', '.join([render_element(i) for i in range(length)])
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 297, in render_element
    return print_val(element_val, internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 156, in print_val
    return print_val(lldb_val.GetChildAtIndex(discriminant_val), internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 132, in print_val
    is_tuple_like = True)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 220, in print_struct_val
    body = separator.join([render_child(idx) for idx in range(field_start_index, len(fields))])
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 213, in render_child
    return this + print_val(field_val.get_wrapped_value(), internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 112, in print_val
    return print_str_slice_val(val, internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 268, in print_str_slice_val
    return read_utf8_string(data_ptr, length)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 305, in read_utf8_string
    data = process.ReadMemory(ptr_val.as_integer(), byte_count, error)
  File "/Applications/Xcode.app/Contents/SharedFrameworks/LLDB.framework/Resources/Python/lldb/__init__.py", line 7184, in ReadMemory
    return _lldb.SBProcess_ReadMemory(self, *args)
ValueError: Positive integer expected
Traceback (most recent call last):
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 115, in print_val
    return print_std_vec_val(val, internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 264, in print_std_vec_val
    internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 299, in print_array_of_values
    return ', '.join([render_element(i) for i in range(length)])
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 297, in render_element
    return print_val(element_val, internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 156, in print_val
    return print_val(lldb_val.GetChildAtIndex(discriminant_val), internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 132, in print_val
    is_tuple_like = True)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 220, in print_struct_val
    body = separator.join([render_child(idx) for idx in range(field_start_index, len(fields))])
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 213, in render_child
    return this + print_val(field_val.get_wrapped_value(), internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 112, in print_val
    return print_str_slice_val(val, internal_dict)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 268, in print_str_slice_val
    return read_utf8_string(data_ptr, length)
  File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 305, in read_utf8_string
    data = process.ReadMemory(ptr_val.as_integer(), byte_count, error)
  File "/Applications/Xcode.app/Contents/SharedFrameworks/LLDB.framework/Resources/Python/lldb/__init__.py", line 7184, in ReadMemory
    return _lldb.SBProcess_ReadMemory(self, *args)
ValueError: Positive integer expected
(regex::re_unicode::Captures) $3 = {
  text = "D 1 2"
  locs = {
    __0 = {
      buf = RawVec<core::option::Option<usize>, alloc::alloc::Global> {
ptr: Unique<core::option::Option<usize>> {
pointer: NonZero<*const core::option::Option<usize>>(&0x10288d280),
_marker: PhantomData<core::option::Option<usize>>
},
cap: 8,
a: Global
}
      len = 8
    }
  }
  named_groups = Arc<std::collections::hash::map::HashMap<alloc::string::String, usize, std::collections::hash::map::RandomState>> {
ptr: NonNull<alloc::arc::ArcInner<std::collections::hash::map::HashMap<alloc::string::String, usize, std::collections::hash::map::RandomState>>> {
pointer: NonZero<*const alloc::arc::ArcInner<std::collections::hash::map::HashMap<alloc::string::String, usize, std::collections::hash::map::RandomState>>>(&0x10288c500)
},
phantom: PhantomData<std::collections::hash::map::HashMap<alloc::string::String, usize, std::collections::hash::map::RandomState>>
}
}
(lldb)

System info:

~/p/h/dom-rooting ❯❯❯ rust-lldb --version
lldb-900.0.57
  Swift-4.0
~/p/h/dom-rooting ❯❯❯ rustc --version
rustc 1.27.0 (3eda71b00 2018-06-19)
~/p/h/dom-rooting ❯❯❯ sw_vers
ProductName:	Mac OS X
ProductVersion:	10.13.5
BuildVersion:	17F77
@euclio euclio mentioned this issue Feb 22, 2019
Merged
Centril added a commit to Centril/rust that referenced this issue Feb 24, 2019
@Centril
Rollup merge of rust-lang#58629 - euclio:debug-empty-str, r=alexcrichton
7f9ee1b 
rust-lldb: fix crash when printing empty string

Fixes rust-lang#52185.

Re-enables the pretty-std debuginfo test and tweaks the test as necessary to get it to pass again. This reveals that lldb's formatting of enums is broken (rust-lang#58492). I also removed the emoji from the test because I couldn't get the docker image's gdb to print the emoji, just octal escapes (https://github.com/rust-lang/rust/pull/53154/files#r208263904).
Centril added a commit to Centril/rust that referenced this issue Feb 25, 2019
@Centril
Rollup merge of rust-lang#58629 - euclio:debug-empty-str, r=alexcrichton
cf1680f 
rust-lldb: fix crash when printing empty string

Fixes rust-lang#52185.

~Re-enables the pretty-std debuginfo test and tweaks the test as necessary to get it to pass again. This reveals that lldb's formatting of enums is broken (rust-lang#58492). I also removed the emoji from the test because I couldn't get the docker image's gdb to print the emoji, just octal escapes (https://github.com/rust-lang/rust/pull/53154/files#r208263904).~
Centril added a commit to Centril/rust that referenced this issue Feb 27, 2019
@Centril
Rollup merge of rust-lang#58629 - euclio:debug-empty-str, r=alexcrichton
eac298a 
rust-lldb: fix crash when printing empty string

Fixes rust-lang#52185.

~Re-enables the pretty-std debuginfo test and tweaks the test as necessary to get it to pass again. This reveals that lldb's formatting of enums is broken (rust-lang#58492). I also removed the emoji from the test because I couldn't get the docker image's gdb to print the emoji, just octal escapes (https://github.com/rust-lang/rust/pull/53154/files#r208263904).~
Centril added a commit to Centril/rust that referenced this issue Feb 27, 2019
@Centril
Rollup merge of rust-lang#58629 - euclio:debug-empty-str, r=alexcrichton
b5d757d 
rust-lldb: fix crash when printing empty string

Fixes rust-lang#52185.

~Re-enables the pretty-std debuginfo test and tweaks the test as necessary to get it to pass again. This reveals that lldb's formatting of enums is broken (rust-lang#58492). I also removed the emoji from the test because I couldn't get the docker image's gdb to print the emoji, just octal escapes (https://github.com/rust-lang/rust/pull/53154/files#r208263904).~
Centril added a commit to Centril/rust that referenced this issue Feb 27, 2019
@Centril
Rollup merge of rust-lang#58629 - euclio:debug-empty-str, r=alexcrichton
1bc0a62 
rust-lldb: fix crash when printing empty string

Fixes rust-lang#52185.

~Re-enables the pretty-std debuginfo test and tweaks the test as necessary to get it to pass again. This reveals that lldb's formatting of enums is broken (rust-lang#58492). I also removed the emoji from the test because I couldn't get the docker image's gdb to print the emoji, just octal escapes (https://github.com/rust-lang/rust/pull/53154/files#r208263904).~
Centril added a commit to Centril/rust that referenced this issue Feb 28, 2019
@Centril
Rollup merge of rust-lang#58629 - euclio:debug-empty-str, r=alexcrichton
7ca2c6e 
rust-lldb: fix crash when printing empty string

Fixes rust-lang#52185.

~Re-enables the pretty-std debuginfo test and tweaks the test as necessary to get it to pass again. This reveals that lldb's formatting of enums is broken (rust-lang#58492). I also removed the emoji from the test because I couldn't get the docker image's gdb to print the emoji, just octal escapes (https://github.com/rust-lang/rust/pull/53154/files#r208263904).~
Centril added a commit to Centril/rust that referenced this issue Feb 28, 2019
@Centril
Rollup merge of rust-lang#58629 - euclio:debug-empty-str, r=alexcrichton
acc2bca 
rust-lldb: fix crash when printing empty string

Fixes rust-lang#52185.

~Re-enables the pretty-std debuginfo test and tweaks the test as necessary to get it to pass again. This reveals that lldb's formatting of enums is broken (rust-lang#58492). I also removed the emoji from the test because I couldn't get the docker image's gdb to print the emoji, just octal escapes (https://github.com/rust-lang/rust/pull/53154/files#r208263904).~
Centril added a commit to Centril/rust that referenced this issue Feb 28, 2019
@Centril
Rollup merge of rust-lang#58629 - euclio:debug-empty-str, r=alexcrichton
f8ece64 
rust-lldb: fix crash when printing empty string

Fixes rust-lang#52185.

~Re-enables the pretty-std debuginfo test and tweaks the test as necessary to get it to pass again. This reveals that lldb's formatting of enums is broken (rust-lang#58492). I also removed the emoji from the test because I couldn't get the docker image's gdb to print the emoji, just octal escapes (https://github.com/rust-lang/rust/pull/53154/files#r208263904).~
pietroalbini added a commit to pietroalbini/rust that referenced this issue Mar 1, 2019
@pietroalbini
Rollup merge of rust-lang#58629 - euclio:debug-empty-str, r=alexcrichton
cb09ce2 
rust-lldb: fix crash when printing empty string

Fixes rust-lang#52185.

~Re-enables the pretty-std debuginfo test and tweaks the test as necessary to get it to pass again. This reveals that lldb's formatting of enums is broken (rust-lang#58492). I also removed the emoji from the test because I couldn't get the docker image's gdb to print the emoji, just octal escapes (https://github.com/rust-lang/rust/pull/53154/files#r208263904).~
Centril added a commit to Centril/rust that referenced this issue Mar 9, 2019
@Centril
Rollup merge of rust-lang#58629 - euclio:debug-empty-str, r=alexcrichton
14a6aa7 
rust-lldb: fix crash when printing empty string

Fixes rust-lang#52185.

~Re-enables the pretty-std debuginfo test and tweaks the test as necessary to get it to pass again. This reveals that lldb's formatting of enums is broken (rust-lang#58492). I also removed the emoji from the test because I couldn't get the docker image's gdb to print the emoji, just octal escapes (https://github.com/rust-lang/rust/pull/53154/files#r208263904).~
Centril added a commit to Centril/rust that referenced this issue Mar 9, 2019
@Centril
Rollup merge of rust-lang#58629 - euclio:debug-empty-str, r=alexcrichton
63cca75 
rust-lldb: fix crash when printing empty string

Fixes rust-lang#52185.

~Re-enables the pretty-std debuginfo test and tweaks the test as necessary to get it to pass again. This reveals that lldb's formatting of enums is broken (rust-lang#58492). I also removed the emoji from the test because I couldn't get the docker image's gdb to print the emoji, just octal escapes (https://github.com/rust-lang/rust/pull/53154/files#r208263904).~
Centril added a commit to Centril/rust that referenced this issue Mar 9, 2019
@Centril
Rollup merge of rust-lang#58629 - euclio:debug-empty-str, r=alexcrichton
6371622 
rust-lldb: fix crash when printing empty string

Fixes rust-lang#52185.

~Re-enables the pretty-std debuginfo test and tweaks the test as necessary to get it to pass again. This reveals that lldb's formatting of enums is broken (rust-lang#58492). I also removed the emoji from the test because I couldn't get the docker image's gdb to print the emoji, just octal escapes (https://github.com/rust-lang/rust/pull/53154/files#r208263904).~
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@alex