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Implement lldb formattter for "clang encoded" enums (LLDB 18.1+)
Summary: I landed a fix last year to enable `DW_TAG_variant_part` encoding in LLDBs (https://reviews.llvm.org/D149213). This PR is a corresponding fix in synthetic formatters to decode that information. This is in no way perfect implementation but at least it improves the status quo. But most types of enums will be visible and debuggable in some way. I've also updated most of the existing tests that touch enums and re-enabled test cases based on LLDB for enums. Test Plan: ran tests `./x test tests/debuginfo/`. Also tested manually in LLDB CLI and LLDB VSCode Other Thoughs A better approach would probably be adopting [formatters from codelldb](https://github.com/vadimcn/codelldb/blob/master/formatters/rust.py). There is some neat hack that hooks up summary provider via synthetic provider which can ultimately fix more display issues for Rust types and enums too. But getting it to work well might take more time that I have right now.
This commit is contained in:
Vladimir Makayev
parent
9c9b568792
commit
fb2d9cdfc5
@ -86,7 +86,8 @@ def synthetic_lookup(valobj, dict):
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return synthetic_lookup(valobj.GetChildAtIndex(discriminant), dict)
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if rust_type == RustType.SINGLETON_ENUM:
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return synthetic_lookup(valobj.GetChildAtIndex(0), dict)
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if rust_type == RustType.ENUM:
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return ClangEncodedEnumProvider(valobj, dict)
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if rust_type == RustType.STD_VEC:
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return StdVecSyntheticProvider(valobj, dict)
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if rust_type == RustType.STD_VEC_DEQUE:
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@ -247,6 +247,58 @@ class StructSyntheticProvider:
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# type: () -> bool
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return True
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class ClangEncodedEnumProvider:
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"""Pretty-printer for 'clang-encoded' enums support implemented in LLDB"""
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DISCRIMINANT_MEMBER_NAME = "$discr$"
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VALUE_MEMBER_NAME = "value"
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def __init__(self, valobj, dict):
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self.valobj = valobj
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self.update()
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def has_children(self):
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return True
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def num_children(self):
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if self.is_default:
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return 1
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return 2
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def get_child_index(self, name):
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if name == ClangEncodedEnumProvider.VALUE_MEMBER_NAME:
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return 0
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if name == ClangEncodedEnumProvider.DISCRIMINANT_MEMBER_NAME:
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return 1
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return -1
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def get_child_at_index(self, index):
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if index == 0:
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return self.variant.GetChildMemberWithName(ClangEncodedEnumProvider.VALUE_MEMBER_NAME)
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if index == 1:
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return self.variant.GetChildMemberWithName(
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ClangEncodedEnumProvider.DISCRIMINANT_MEMBER_NAME)
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def update(self):
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all_variants = self.valobj.GetChildAtIndex(0)
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index = self._getCurrentVariantIndex(all_variants)
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self.variant = all_variants.GetChildAtIndex(index)
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self.is_default = self.variant.GetIndexOfChildWithName(
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ClangEncodedEnumProvider.DISCRIMINANT_MEMBER_NAME) == -1
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def _getCurrentVariantIndex(self, all_variants):
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default_index = 0
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for i in range(all_variants.GetNumChildren()):
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variant = all_variants.GetChildAtIndex(i)
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discr = variant.GetChildMemberWithName(
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ClangEncodedEnumProvider.DISCRIMINANT_MEMBER_NAME)
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if discr.IsValid():
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discr_unsigned_value = discr.GetValueAsUnsigned()
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if variant.GetName() == f"$variant${discr_unsigned_value}":
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return i
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else:
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default_index = i
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return default_index
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class TupleSyntheticProvider:
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"""Pretty-printer for tuples and tuple enum variants"""
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@ -60,6 +60,7 @@ TUPLE_ITEM_REGEX = re.compile(r"__\d+$")
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ENCODED_ENUM_PREFIX = "RUST$ENCODED$ENUM$"
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ENUM_DISR_FIELD_NAME = "<<variant>>"
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ENUM_LLDB_ENCODED_VARIANTS = "$variants$"
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STD_TYPE_TO_REGEX = {
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RustType.STD_STRING: STD_STRING_REGEX,
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@ -96,7 +97,11 @@ def classify_struct(name, fields):
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if regex.match(name):
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return ty
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if fields[0].name == ENUM_DISR_FIELD_NAME:
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# <<variant>> is emitted by GDB while LLDB(18.1+) emits "$variants$"
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if (
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fields[0].name == ENUM_DISR_FIELD_NAME
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or fields[0].name == ENUM_LLDB_ENCODED_VARIANTS
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):
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return RustType.ENUM
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if is_tuple_fields(fields):
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@ -1,6 +1,6 @@
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// Require a gdb or lldb that can read DW_TAG_variant_part.
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//@ min-gdb-version: 8.2
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//@ needs-rust-lldb
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//@ min-lldb-version: 1800
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//@ compile-flags:-g
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@ -23,10 +23,13 @@
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// lldb-command:run
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// lldb-command:v *the_a_ref
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// lldbg-check:(borrowed_enum::ABC) *the_a_ref = { value = { x = 0 y = 8970181431921507452 } $discr$ = 0 }
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// lldbr-check:(borrowed_enum::ABC::TheA) *the_a_ref = TheA { TheA: 0, TheB: 8970181431921507452 }
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// lldb-command:v *the_b_ref
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// lldbg-check:(borrowed_enum::ABC) *the_b_ref = { value = { 0 = 0 1 = 286331153 2 = 286331153 } $discr$ = 1 }
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// lldbr-check:(borrowed_enum::ABC::TheB) *the_b_ref = { = 0 = 286331153 = 286331153 }
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// lldb-command:v *univariant_ref
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// lldbg-check:(borrowed_enum::Univariant) *univariant_ref = { value = { 0 = 4820353753753434 } }
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// lldbr-check:(borrowed_enum::Univariant) *univariant_ref = { TheOnlyCase = { = 4820353753753434 } }
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#![allow(unused_variables)]
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@ -1,8 +1,9 @@
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// Require a gdb that can read DW_TAG_variant_part.
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//@ min-gdb-version: 8.2
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//@ min-lldb-version: 1800
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// LLDB without native Rust support cannot read DW_TAG_variant_part,
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// so it prints nothing for coroutines. But those tests are kept to
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// LLDB (18.1+) now supports DW_TAG_variant_part, but there is some bug in either compiler or LLDB
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// with memory layout of discriminant for this particular enum
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// ensure that LLDB won't crash at least (like #57822).
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//@ compile-flags:-g
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@ -26,16 +27,7 @@
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// lldb-command:run
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// lldb-command:v b
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// lldbg-check:(coroutine_objects::main::{coroutine_env#0}) b =
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// lldb-command:continue
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// lldb-command:v b
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// lldbg-check:(coroutine_objects::main::{coroutine_env#0}) b =
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// lldb-command:continue
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// lldb-command:v b
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// lldbg-check:(coroutine_objects::main::{coroutine_env#0}) b =
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// lldb-command:continue
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// lldb-command:v b
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// lldbg-check:(coroutine_objects::main::{coroutine_env#0}) b =
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// lldb-check:(coroutine_objects::main::{coroutine_env#0}) b = { value = { _ref__a = 0x[...] } $discr$ = [...] }
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// === CDB TESTS ===================================================================================
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@ -1,6 +1,6 @@
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// Require a gdb that can read DW_TAG_variant_part.
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//@ min-gdb-version: 8.2
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//@ min-lldb-version: 1800
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//@ compile-flags:-g -Z thinlto
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// === GDB TESTS ===================================================================================
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@ -15,7 +15,7 @@
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// lldb-command:run
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// lldb-command:v *abc
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// lldbg-check:(enum_thinlto::ABC) *abc =
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// lldbg-check:(enum_thinlto::ABC) *abc = { value = { x = 0 y = 8970181431921507452 } $discr$ = 0 }
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// lldbr-check:(enum_thinlto::ABC) *abc = (x = 0, y = 8970181431921507452)
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#![allow(unused_variables)]
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@ -3,7 +3,7 @@
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// Require a gdb that can read DW_TAG_variant_part.
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//@ min-gdb-version: 8.2
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//@ min-lldb-version: 1800
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//@ compile-flags:-g
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// === GDB TESTS ===================================================================================
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@ -24,7 +24,7 @@
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// lldbg-check:(issue_57822::main::{closure_env#1}) g = { f = { x = 1 } }
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// lldb-command:v b
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// lldbg-check:(issue_57822::main::{coroutine_env#3}) b =
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// lldbg-check:(issue_57822::main::{coroutine_env#3}) b = { value = { a = { value = { y = 2 } $discr$ = '\x02' } } $discr$ = '\x02' }
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#![feature(omit_gdb_pretty_printer_section, coroutines, coroutine_trait, stmt_expr_attributes)]
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#![omit_gdb_pretty_printer_section]
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@ -1,6 +1,80 @@
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//@ only-cdb
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//@ min-lldb-version: 1800
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//@ ignore-gdb
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//@ compile-flags:-g
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//
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// === LLDB TESTS ==================================================================================
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// lldb-command:run
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// lldb-command:v a
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// lldbg-check:(core::option::Option<msvc_pretty_enums::CStyleEnum>) a = { value = { 0 = Low } }
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// lldb-command:v b
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// lldbg-check:(core::option::Option<msvc_pretty_enums::CStyleEnum>) b = { value = $discr$ = '\x01' }
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// lldb-command:v c
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// lldbg-check:(msvc_pretty_enums::NicheLayoutEnum) c = { value = $discr$ = '\x11' }
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// lldb-command:v d
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// lldbg-check:(msvc_pretty_enums::NicheLayoutEnum) d = { value = { my_data = High } }
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// lldb-command:v e
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// lldbg-check:(msvc_pretty_enums::NicheLayoutEnum) e = { value = $discr$ = '\x13' }
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// lldb-command:v h
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// lldbg-check:(core::option::Option<u32>) h = { value = { 0 = 12 } $discr$ = 1 }
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// lldb-command:v i
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// lldbg-check:(core::option::Option<u32>) i = { value = $discr$ = 0 }
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// lldb-command:v j
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// lldbg-check:(msvc_pretty_enums::CStyleEnum) j = High
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// lldb-command:v k
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// lldbg-check:(core::option::Option<alloc::string::String>) k = { value = { 0 = "IAMA optional string!" { vec = size=21 { [0] = 'I' [1] = 'A' [2] = 'M' [3] = 'A' [4] = ' ' [5] = 'o' [6] = 'p' [7] = 't' [8] = 'i' [9] = 'o' [10] = 'n' [11] = 'a' [12] = 'l' [13] = ' ' [14] = 's' [15] = 't' [16] = 'r' [17] = 'i' [18] = 'n' [19] = 'g' [20] = '!' } } } }
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// lldb-command:v l
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// lldbg-check:(core::result::Result<u32, msvc_pretty_enums::Empty>) l = { value = { 0 = {} } }
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// lldb-command:v niche128_some
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// lldbg-check:(core::option::Option<core::num::nonzero::NonZero<i128>>) niche128_some = { value = $discr$ = 123456 }
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// lldb-command:v niche128_none
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// lldbg-check:(core::option::Option<core::num::nonzero::NonZero<i128>>) niche128_none = { value = $discr$ = 0 }
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// lldb-command:v wrapping_niche128_untagged
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// lldbg-check:(msvc_pretty_enums::Wrapping128Niche) wrapping_niche128_untagged = { value = { 0 = { 0 = 340282366920938463463374607431768211454 } } }
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// lldb-command:v wrapping_niche128_none1
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// lldbg-check:(msvc_pretty_enums::Wrapping128Niche) wrapping_niche128_none1 = { value = { 0 = { 0 = 2 } } }
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// lldb-command:v direct_tag_128_a
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// lldbg-check:(msvc_pretty_enums::DirectTag128) direct_tag_128_a = { value = { 0 = 42 } $discr$ = 0 }
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// lldb-command:v direct_tag_128_b
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// lldbg-check:(msvc_pretty_enums::DirectTag128) direct_tag_128_b = { value = { 0 = 137 } $discr$ = 1 }
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// &u32 is incorrectly formatted and LLDB thinks it's a char* so skipping niche_w_fields_1_some
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// lldb-command:v niche_w_fields_1_none
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// lldbg-check:(msvc_pretty_enums::NicheLayoutWithFields1) niche_w_fields_1_none = { value = { 0 = 99 } $discr$ = 1 }
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// lldb-command:v niche_w_fields_2_some
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// lldbg-check:(msvc_pretty_enums::NicheLayoutWithFields2) niche_w_fields_2_some = { value = { 0 = 800 { __0 = { 0 = 800 } } 1 = 900 } $discr$ = 0 }
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// lldb-command:v niche_w_fields_3_some
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// lldbg-check:(msvc_pretty_enums::NicheLayoutWithFields3) niche_w_fields_3_some = { value = { 0 = '\x89' 1 = true } }
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// lldb-command:v niche_w_fields_3_niche3
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// lldbg-check:(msvc_pretty_enums::NicheLayoutWithFields3) niche_w_fields_3_niche3 = { value = { 0 = '"' } $discr$ = '\x04' }
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// lldb-command:v arbitrary_discr1
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// lldbg-check:(msvc_pretty_enums::ArbitraryDiscr) arbitrary_discr1 = { value = { 0 = 1234 } $discr$ = 1000 }
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// lldb-command:v arbitrary_discr2
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// lldbg-check:(msvc_pretty_enums::ArbitraryDiscr) arbitrary_discr2 = { value = { 0 = 5678 } $discr$ = 5000000 }
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// === CDB TESTS ==================================================================================
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// cdb-command: g
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//
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// cdb-command: dx a
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@ -1,7 +1,6 @@
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// Require a gdb or lldb that can read DW_TAG_variant_part.
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//@ min-gdb-version: 8.2
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//@ needs-rust-lldb
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//@ min-lldb-version: 1800
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//@ compile-flags:-g
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// === GDB TESTS ===================================================================================
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@ -27,15 +26,19 @@
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// lldb-command:run
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// lldb-command:v case1
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// lldbg-check:(struct_style_enum::Regular) case1 = { value = { a = 0 b = 31868 c = 31868 d = 31868 e = 31868 } $discr$ = 0 }
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// lldbr-check:(struct_style_enum::Regular::Case1) case1 = { a = 0 b = 31868 c = 31868 d = 31868 e = 31868 }
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// lldb-command:v case2
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// lldbg-check:(struct_style_enum::Regular) case2 = { value = { a = 0 b = 286331153 c = 286331153 } $discr$ = 1 }
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// lldbr-check:(struct_style_enum::Regular::Case2) case2 = Case2 { Case1: 0, Case2: 286331153, Case3: 286331153 }
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// lldb-command:v case3
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// lldbg-check:(struct_style_enum::Regular) case3 = { value = { a = 0 b = 6438275382588823897 } $discr$ = 2 }
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// lldbr-check:(struct_style_enum::Regular::Case3) case3 = Case3 { Case1: 0, Case2: 6438275382588823897 }
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// lldb-command:v univariant
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// lldbg-check:(struct_style_enum::Univariant) univariant = { value = { a = -1 } }
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// lldbr-check:(struct_style_enum::Univariant) univariant = Univariant { TheOnlyCase: TheOnlyCase { a: -1 } }
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#![allow(unused_variables)]
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@ -1,6 +1,6 @@
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// Require a gdb or lldb that can read DW_TAG_variant_part.
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//@ min-gdb-version: 8.2
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//@ needs-rust-lldb
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//@ min-lldb-version: 1800
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//@ compile-flags:-g
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@ -27,15 +27,19 @@
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// lldb-command:run
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// lldb-command:v case1
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// lldbg-check:(tuple_style_enum::Regular) case1 = { value = { 0 = 0 1 = 31868 2 = 31868 3 = 31868 4 = 31868 } $discr$ = 0 }
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// lldbr-check:(tuple_style_enum::Regular::Case1) case1 = { = 0 = 31868 = 31868 = 31868 = 31868 }
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// lldb-command:v case2
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// lldbg-check:(tuple_style_enum::Regular) case2 = { value = { 0 = 0 1 = 286331153 2 = 286331153 } $discr$ = 1 }
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// lldbr-check:(tuple_style_enum::Regular::Case2) case2 = Case2 { Case1: 0, Case2: 286331153, Case3: 286331153 }
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// lldb-command:v case3
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// lldbg-check:(tuple_style_enum::Regular) case3 = { value = { 0 = 0 1 = 6438275382588823897 } $discr$ = 2 }
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// lldbr-check:(tuple_style_enum::Regular::Case3) case3 = Case3 { Case1: 0, Case2: 6438275382588823897 }
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// lldb-command:v univariant
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// lldbg-check:(tuple_style_enum::Univariant) univariant = { value = { 0 = -1 } }
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// lldbr-check:(tuple_style_enum::Univariant) univariant = { TheOnlyCase = { = -1 } }
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#![allow(unused_variables)]
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@ -1,6 +1,6 @@
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// Require a gdb or lldb that can read DW_TAG_variant_part.
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//@ min-gdb-version: 8.2
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//@ needs-rust-lldb
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//@ min-lldb-version: 1800
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//@ compile-flags:-g
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@ -23,12 +23,15 @@
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// lldb-command:run
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// lldb-command:v *the_a
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// lldbg-check:(unique_enum::ABC) *the_a = { value = { x = 0 y = 8970181431921507452 } $discr$ = 0 }
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// lldbr-check:(unique_enum::ABC::TheA) *the_a = TheA { TheA: 0, TheB: 8970181431921507452 }
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// lldb-command:v *the_b
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// lldbg-check:(unique_enum::ABC) *the_b = { value = { 0 = 0 1 = 286331153 2 = 286331153 } $discr$ = 1 }
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// lldbr-check:(unique_enum::ABC::TheB) *the_b = { = 0 = 286331153 = 286331153 }
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// lldb-command:v *univariant
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// lldbg-check:(unique_enum::Univariant) *univariant = { value = { 0 = 123234 } }
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// lldbr-check:(unique_enum::Univariant) *univariant = { TheOnlyCase = { = 123234 } }
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#![allow(unused_variables)]
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