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LibJS: Add a basic pass manager and add some basic passes

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This commit adds a bunch of passes, the most interesting of which is a
pass that merges blocks together, and a pass that places blocks that
flow into each other next to each other, and a very simply pass that
removes duplicate basic blocks.
Note that this does not remove the jump at the end of each block in that
pass to avoid scope creep in the passes.
This commit is contained in:
Ali Mohammad Pur 2021-06-13 20:40:20 +04:30 • committed by Ali Mohammad Pur
parent e81fd7106b
commit 1414c7b049
17 changed files with 751 additions and 30 deletions
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9
Userland/Utilities/js.cpp
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@ -17,6 +17,7 @@
#include <LibJS/Bytecode/BasicBlock.h>
#include <LibJS/Bytecode/Generator.h>
#include <LibJS/Bytecode/Interpreter.h>
#include <LibJS/Bytecode/PassManager.h>
#include <LibJS/Console.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Parser.h>
@ -81,6 +82,7 @@ private:
static bool s_dump_ast = false;
static bool s_dump_bytecode = false;
static bool s_run_bytecode = false;
static bool s_opt_bytecode = false;
static bool s_print_last_result = false;
static RefPtr<Line::Editor> s_editor;
static String s_history_path = String::formatted("{}/.js-history", Core::StandardPaths::home_directory());
@ -558,6 +560,12 @@ static bool parse_and_run(JS::Interpreter& interpreter, const StringView& source
} else {
if (s_dump_bytecode || s_run_bytecode) {
auto unit = JS::Bytecode::Generator::generate(*program);
if (s_opt_bytecode) {
auto& passes = JS::Bytecode::Interpreter::optimization_pipeline();
passes.perform(unit);
dbgln("Optimisation passes took {}us", passes.elapsed());
}
if (s_dump_bytecode) {
for (auto& block : unit.basic_blocks)
block.dump(unit);
@ -825,6 +833,7 @@ int main(int argc, char** argv)
args_parser.add_option(s_dump_ast, "Dump the AST", "dump-ast", 'A');
args_parser.add_option(s_dump_bytecode, "Dump the bytecode", "dump-bytecode", 'd');
args_parser.add_option(s_run_bytecode, "Run the bytecode", "run-bytecode", 'b');
args_parser.add_option(s_opt_bytecode, "Optimize the bytecode", "optimize-bytecode", 'p');
args_parser.add_option(s_print_last_result, "Print last result", "print-last-result", 'l');
args_parser.add_option(gc_on_every_allocation, "GC on every allocation", "gc-on-every-allocation", 'g');
args_parser.add_option(disable_syntax_highlight, "Disable live syntax highlighting", "no-syntax-highlight", 's');