[Lldb-commits] [lldb] [lldb][DataFormatter] Remove support for old std::map layout (PR #97549)
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lldb-commits at lists.llvm.org
Wed Jul 3 03:09:40 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-lldb
Author: Michael Buch (Michael137)
<details>
<summary>Changes</summary>
We currently supported the layout from pre-2016 (before the layout
change in [14caaddd3f08e798dcd9ac0ddfc](https://github.com/llvm/llvm-project/commit/14caaddd3f08e798dcd9ac0ddfc)).
We have another upcoming layout change in `__tree` and `map` (as part of
require rewriting parts of this formatter. Removing the support will
make those changes more straightforward to review/maintain.
Being backward compatible would be great but we have no tests that
actually verify that the old layout still works (and our oldest
matrix bot tests clang-15). If anyone feels strongly about keeping
this layout, we could possibly factor out that logic and keep it around.
---
Full diff: https://github.com/llvm/llvm-project/pull/97549.diff
1 Files Affected:
- (modified) lldb/source/Plugins/Language/CPlusPlus/LibCxxMap.cpp (+29-39)
``````````diff
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibCxxMap.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibCxxMap.cpp
index 44fe294ced722..7eb6a3637acd2 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibCxxMap.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibCxxMap.cpp
@@ -264,39 +264,33 @@ void lldb_private::formatters::LibcxxStdMapSyntheticFrontEnd::GetValueOffset(
if (!node)
return;
CompilerType node_type(node->GetCompilerType());
- uint64_t bit_offset;
- if (node_type.GetIndexOfFieldWithName("__value_", nullptr, &bit_offset) !=
- UINT32_MAX) {
- // Old layout (pre 089a7cc5dea)
- m_skip_size = bit_offset / 8u;
- } else {
- auto ast_ctx = node_type.GetTypeSystem().dyn_cast_or_null<TypeSystemClang>();
- if (!ast_ctx)
- return;
- CompilerType tree_node_type = ast_ctx->CreateStructForIdentifier(
- llvm::StringRef(),
- {{"ptr0", ast_ctx->GetBasicType(lldb::eBasicTypeVoid).GetPointerType()},
- {"ptr1", ast_ctx->GetBasicType(lldb::eBasicTypeVoid).GetPointerType()},
- {"ptr2", ast_ctx->GetBasicType(lldb::eBasicTypeVoid).GetPointerType()},
- {"cw", ast_ctx->GetBasicType(lldb::eBasicTypeBool)},
- {"payload", (m_element_type.GetCompleteType(), m_element_type)}});
- std::string child_name;
- uint32_t child_byte_size;
- int32_t child_byte_offset = 0;
- uint32_t child_bitfield_bit_size;
- uint32_t child_bitfield_bit_offset;
- bool child_is_base_class;
- bool child_is_deref_of_parent;
- uint64_t language_flags;
- auto child_type =
- llvm::expectedToStdOptional(tree_node_type.GetChildCompilerTypeAtIndex(
- nullptr, 4, true, true, true, child_name, child_byte_size,
- child_byte_offset, child_bitfield_bit_size,
- child_bitfield_bit_offset, child_is_base_class,
- child_is_deref_of_parent, nullptr, language_flags));
- if (child_type && child_type->IsValid())
- m_skip_size = (uint32_t)child_byte_offset;
- }
+ auto ast_ctx = node_type.GetTypeSystem().dyn_cast_or_null<TypeSystemClang>();
+ if (!ast_ctx)
+ return;
+
+ CompilerType tree_node_type = ast_ctx->CreateStructForIdentifier(
+ llvm::StringRef(),
+ {{"ptr0", ast_ctx->GetBasicType(lldb::eBasicTypeVoid).GetPointerType()},
+ {"ptr1", ast_ctx->GetBasicType(lldb::eBasicTypeVoid).GetPointerType()},
+ {"ptr2", ast_ctx->GetBasicType(lldb::eBasicTypeVoid).GetPointerType()},
+ {"cw", ast_ctx->GetBasicType(lldb::eBasicTypeBool)},
+ {"payload", (m_element_type.GetCompleteType(), m_element_type)}});
+ std::string child_name;
+ uint32_t child_byte_size;
+ int32_t child_byte_offset = 0;
+ uint32_t child_bitfield_bit_size;
+ uint32_t child_bitfield_bit_offset;
+ bool child_is_base_class;
+ bool child_is_deref_of_parent;
+ uint64_t language_flags;
+ auto child_type =
+ llvm::expectedToStdOptional(tree_node_type.GetChildCompilerTypeAtIndex(
+ nullptr, 4, true, true, true, child_name, child_byte_size,
+ child_byte_offset, child_bitfield_bit_size, child_bitfield_bit_offset,
+ child_is_base_class, child_is_deref_of_parent, nullptr,
+ language_flags));
+ if (child_type && child_type->IsValid())
+ m_skip_size = (uint32_t)child_byte_offset;
}
lldb::ValueObjectSP
@@ -343,12 +337,8 @@ lldb_private::formatters::LibcxxStdMapSyntheticFrontEnd::GetChildAtIndex(
return lldb::ValueObjectSP();
}
GetValueOffset(iterated_sp);
- auto child_sp = iterated_sp->GetChildMemberWithName("__value_");
- if (child_sp)
- iterated_sp = child_sp;
- else
- iterated_sp = iterated_sp->GetSyntheticChildAtOffset(
- m_skip_size, m_element_type, true);
+ iterated_sp = iterated_sp->GetSyntheticChildAtOffset(m_skip_size,
+ m_element_type, true);
if (!iterated_sp) {
m_tree = nullptr;
return lldb::ValueObjectSP();
``````````
</details>
https://github.com/llvm/llvm-project/pull/97549
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