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LibJS/JIT: Produce & register an ELF image for GDB JIT Interface
Using the code that it has just produced, the JIT::Compiler can build an ELF image so that we can attach meaningful symbols to JITted code, and thus enable GDB to display more information about the code that we're running.
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3 changed files with 20 additions and 3 deletions
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@ -6,6 +6,7 @@
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*/
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#include <AK/BinarySearch.h>
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#include <LibJIT/GDB.h>
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#include <LibJS/Bytecode/Interpreter.h>
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#include <LibJS/JIT/NativeExecutable.h>
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#include <LibJS/Runtime/VM.h>
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@ -14,10 +15,11 @@
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namespace JS::JIT {
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NativeExecutable::NativeExecutable(void* code, size_t size, Vector<BytecodeMapping> mapping)
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NativeExecutable::NativeExecutable(void* code, size_t size, Vector<BytecodeMapping> mapping, Optional<FixedArray<u8>> gdb_object)
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: m_code(code)
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, m_size(size)
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, m_mapping(move(mapping))
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, m_gdb_object(move(gdb_object))
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{
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// Translate block index to instruction address, so the native code can just jump to it.
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for (auto const& entry : m_mapping) {
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@ -28,10 +30,14 @@ NativeExecutable::NativeExecutable(void* code, size_t size, Vector<BytecodeMappi
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m_block_entry_points.append(bit_cast<FlatPtr>(m_code) + entry.native_offset);
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}
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}
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if (m_gdb_object.has_value())
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::JIT::GDB::register_into_gdb(m_gdb_object.value().span());
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}
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NativeExecutable::~NativeExecutable()
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{
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if (m_gdb_object.has_value())
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::JIT::GDB::unregister_from_gdb(m_gdb_object.value().span());
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munmap(m_code, m_size);
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}
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