mirror of
https://github.com/LadybirdBrowser/ladybird.git
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fb05063dde
This commits puts the strict mode flag in the header of every bytecode instruction. This allows us to check for strict mode without looking at the currently running execution context.
118 lines
3.5 KiB
C++
118 lines
3.5 KiB
C++
/*
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* Copyright (c) 2021-2024, Andreas Kling <andreas@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Bytecode/BasicBlock.h>
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#include <LibJS/Bytecode/Executable.h>
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#include <LibJS/Bytecode/Instruction.h>
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#include <LibJS/Bytecode/RegexTable.h>
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#include <LibJS/Runtime/Value.h>
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#include <LibJS/SourceCode.h>
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namespace JS::Bytecode {
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GC_DEFINE_ALLOCATOR(Executable);
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Executable::Executable(
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Vector<u8> bytecode,
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NonnullOwnPtr<IdentifierTable> identifier_table,
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NonnullOwnPtr<StringTable> string_table,
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NonnullOwnPtr<RegexTable> regex_table,
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Vector<Value> constants,
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NonnullRefPtr<SourceCode const> source_code,
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size_t number_of_property_lookup_caches,
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size_t number_of_global_variable_caches,
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size_t number_of_registers,
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Strict strict)
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: bytecode(move(bytecode))
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, string_table(move(string_table))
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, identifier_table(move(identifier_table))
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, regex_table(move(regex_table))
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, constants(move(constants))
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, source_code(move(source_code))
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, number_of_registers(number_of_registers)
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, is_strict_mode(strict == Strict::Yes)
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{
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property_lookup_caches.resize(number_of_property_lookup_caches);
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global_variable_caches.resize(number_of_global_variable_caches);
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}
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Executable::~Executable() = default;
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void Executable::dump() const
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{
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warnln("\033[37;1mJS bytecode executable\033[0m \"{}\"", name);
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InstructionStreamIterator it(bytecode, this);
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size_t basic_block_offset_index = 0;
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while (!it.at_end()) {
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bool print_basic_block_marker = false;
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if (basic_block_offset_index < basic_block_start_offsets.size()
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&& it.offset() == basic_block_start_offsets[basic_block_offset_index]) {
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++basic_block_offset_index;
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print_basic_block_marker = true;
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}
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StringBuilder builder;
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builder.appendff("[{:4x}] ", it.offset());
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if (print_basic_block_marker)
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builder.appendff("{:4}: ", basic_block_offset_index - 1);
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else
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builder.append(" "sv);
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builder.append((*it).to_byte_string(*this));
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warnln("{}", builder.string_view());
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++it;
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}
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if (!exception_handlers.is_empty()) {
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warnln("");
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warnln("Exception handlers:");
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for (auto& handlers : exception_handlers) {
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warnln(" from {:4x} to {:4x} handler {:4x} finalizer {:4x}",
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handlers.start_offset,
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handlers.end_offset,
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handlers.handler_offset.value_or(0),
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handlers.finalizer_offset.value_or(0));
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}
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}
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warnln("");
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}
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void Executable::visit_edges(Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(constants);
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}
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Optional<Executable::ExceptionHandlers const&> Executable::exception_handlers_for_offset(size_t offset) const
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{
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for (auto& handlers : exception_handlers) {
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if (handlers.start_offset <= offset && offset < handlers.end_offset)
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return handlers;
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}
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return {};
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}
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UnrealizedSourceRange Executable::source_range_at(size_t offset) const
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{
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if (offset >= bytecode.size())
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return {};
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auto it = InstructionStreamIterator(bytecode.span().slice(offset), this);
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VERIFY(!it.at_end());
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auto mapping = source_map.get(offset);
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if (!mapping.has_value())
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return {};
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return UnrealizedSourceRange {
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.source_code = source_code,
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.start_offset = mapping->source_start_offset,
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.end_offset = mapping->source_end_offset,
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};
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}
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}
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