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LibDebug: Add DebugInfo::get_source_position_with_inlines

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This function returns the source position of a given address in the
program. If that address exists in an inline chain, then it also returns
the source positions that are in the chain.
This commit is contained in:
Itamar 2021-06-19 12:12:52 +03:00 committed by Andreas Kling
parent 835efa1b6a
commit a45b5ccd96
Notes: sideshowbarker 2024-07-18 12:01:11 +09:00 
Author: https://github.com/itamar8910
Commit: https://github.com/SerenityOS/serenity/commit/a45b5ccd969
Pull-request: https://github.com/SerenityOS/serenity/pull/8149
Reviewed-by: https://github.com/gunnarbeutner
2 changed files with 84 additions and 2 deletions
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75
Userland/Libraries/LibDebug/DebugInfo.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
* Copyright (c) 2020-2021, Itamar S. <itamar8910@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -380,4 +380,77 @@ DebugInfo::SourcePosition DebugInfo::SourcePosition::from_line_info(const Dwarf:
return { line.file, line.line, { line.address } };
}
DebugInfo::SourcePositionWithInlines DebugInfo::get_source_position_with_inlines(u32 address) const
{
// If the address is in an "inline chain", this is the inner-most inlined position.
auto inner_source_position = get_source_position(address);
auto die = m_dwarf_info.get_die_at_address(address);
if (!die.has_value() || die->tag() == Dwarf::EntryTag::SubroutineType) {
// Inline chain is empty
return SourcePositionWithInlines { inner_source_position, {} };
}
Vector<SourcePosition> inline_chain;
auto insert_to_chain = [&](const Dwarf::DIE& die) {
auto caller_source_path = get_source_path_of_inline(die);
auto caller_line = get_line_of_inline(die);
if (!caller_source_path.has_value() || !caller_line.has_value()) {
return;
}
inline_chain.append({ String::formatted("{}/{}", caller_source_path->directory, caller_source_path->filename), caller_line.value() });
};
while (die->tag() == Dwarf::EntryTag::InlinedSubroutine) {
insert_to_chain(*die);
if (!die->parent_offset().has_value()) {
break;
}
auto parent = die->compilation_unit().dwarf_info().get_cached_die_at_offset(die->parent_offset().value());
if (!parent.has_value()) {
break;
}
die = *parent;
}
return SourcePositionWithInlines { inner_source_position, inline_chain };
}
Optional<Dwarf::LineProgram::DirectoryAndFile> DebugInfo::get_source_path_of_inline(const Dwarf::DIE& die) const
{
auto caller_file = die.get_attribute(Dwarf::Attribute::CallFile);
if (caller_file.has_value()) {
u32 file_index = 0;
if (caller_file->type == Dwarf::AttributeValue::Type::UnsignedNumber) {
file_index = caller_file->data.as_u32;
} else if (caller_file->type == Dwarf::AttributeValue::Type::SignedNumber) {
// For some reason, the file_index is sometimes stored as a signed number.
VERIFY(caller_file->data.as_i32 >= 0);
file_index = (u32)caller_file->data.as_i32;
} else {
return {};
}
return die.compilation_unit().line_program().get_directory_and_file(file_index);
}
return {};
}
Optional<uint32_t> DebugInfo::get_line_of_inline(const Dwarf::DIE& die) const
{
auto caller_line = die.get_attribute(Dwarf::Attribute::CallLine);
if (!caller_line.has_value())
return {};
if (caller_line->type != Dwarf::AttributeValue::Type::UnsignedNumber)
return {};
return caller_line.value().data.as_u32;
}
}

11
Userland/Libraries/LibDebug/DebugInfo.h
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
* Copyright (c) 2020-2021, Itamar S. <itamar8910@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -95,6 +95,12 @@ public:
Optional<SourcePosition> get_source_position(u32 address) const;
struct SourcePositionWithInlines {
Optional<SourcePosition> source_position;
Vector<SourcePosition> inline_chain;
};
SourcePositionWithInlines get_source_position_with_inlines(u32 address) const;
struct SourcePositionAndAddress {
String file;
size_t line;
@ -115,6 +121,9 @@ private:
static bool is_variable_tag_supported(const Dwarf::EntryTag& tag);
void add_type_info_to_variable(const Dwarf::DIE& type_die, const PtraceRegisters& regs, DebugInfo::VariableInfo* parent_variable) const;
Optional<Dwarf::LineProgram::DirectoryAndFile> get_source_path_of_inline(const Dwarf::DIE&) const;
Optional<uint32_t> get_line_of_inline(const Dwarf::DIE&) const;
NonnullOwnPtr<const ELF::Image> m_elf;
String m_source_root;
FlatPtr m_base_address { 0 };