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https://github.com/SerenityOS/serenity
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LibJS/JIT: Dump disassembly of generated code using LibX86
This avoids the need for redirecting stdout to a file and using ndisasm, which can lead to problems if other things are printed.
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@ -268,3 +268,6 @@ set(SOURCES
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serenity_lib(LibJS js)
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target_link_libraries(LibJS PRIVATE LibCore LibCrypto LibFileSystem LibRegex LibSyntax LibLocale LibUnicode LibJIT)
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if("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "x86_64")
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target_link_libraries(LibJS PRIVATE LibX86)
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endif()
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@ -24,6 +24,7 @@
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# define LOG_JIT_SUCCESS 1
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# define LOG_JIT_FAILURE 1
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# define DUMP_JIT_MACHINE_CODE_TO_STDOUT 0
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# define DUMP_JIT_DISASSEMBLY 0
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# define TRY_OR_SET_EXCEPTION(expression) \
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({ \
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@ -1154,7 +1155,10 @@ OwnPtr<NativeExecutable> Compiler::compile(Bytecode::Executable& bytecode_execut
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dbgln("\033[32;1mJIT compilation succeeded!\033[0m {}", bytecode_executable.name);
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}
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return make<NativeExecutable>(executable_memory, compiler.m_output.size());
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auto executable = make<NativeExecutable>(executable_memory, compiler.m_output.size());
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if constexpr (DUMP_JIT_DISASSEMBLY)
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executable->dump_disassembly();
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return executable;
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}
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}
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@ -7,6 +7,7 @@
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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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#include <LibX86/Disassembler.h>
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#include <sys/mman.h>
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namespace JS::JIT {
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@ -30,4 +31,42 @@ void NativeExecutable::run(VM& vm) const
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vm.running_execution_context().local_variables.data());
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}
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void NativeExecutable::dump_disassembly() const
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{
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#if ARCH(X86_64)
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auto const* code_bytes = static_cast<u8 const*>(m_code);
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auto stream = X86::SimpleInstructionStream { code_bytes, m_size };
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auto disassembler = X86::Disassembler(stream);
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while (true) {
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auto offset = stream.offset();
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auto virtual_offset = bit_cast<size_t>(m_code) + offset;
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auto insn = disassembler.next();
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if (!insn.has_value())
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break;
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StringBuilder builder;
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builder.appendff("{:p} ", virtual_offset);
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auto length = insn.value().length();
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for (size_t i = 0; i < 7; i++) {
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if (i < length)
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builder.appendff("{:02x} ", code_bytes[offset + i]);
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else
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builder.append(" "sv);
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}
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builder.append(" "sv);
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builder.append(insn.value().to_deprecated_string(virtual_offset, nullptr));
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dbgln("{}", builder.string_view());
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for (size_t bytes_printed = 7; bytes_printed < length; bytes_printed += 7) {
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builder.clear();
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builder.appendff("{:p} ", virtual_offset + bytes_printed);
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for (size_t i = bytes_printed; i < bytes_printed + 7 && i < length; i++)
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builder.appendff(" {:02x}", code_bytes[offset + i]);
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dbgln("{}", builder.string_view());
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}
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}
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#endif
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}
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}
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@ -21,6 +21,7 @@ public:
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~NativeExecutable();
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void run(VM&) const;
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void dump_disassembly() const;
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private:
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void* m_code { nullptr };
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