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LibJS: Generate bytecode in basic blocks instead of one big block

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This limits the size of each block (currently set to 1K), and gets us
closer to a canonical, more easily analysable bytecode format.
As a result of this, "Labels" are now simply entries to basic blocks.
Since there is no more 'conditional' jump (as all jumps are always
taken), JumpIf{True,False} are unified to JumpConditional, and
JumpIfNullish is renamed to JumpNullish.
Also fixes #7914 as a result of reimplementing the loop logic.
This commit is contained in:
Ali Mohammad Pur 2021-06-09 06:49:58 +04:30 • committed by Andreas Kling
parent d7a25cdb82
commit 01e8f0889a
16 changed files with 392 additions and 174 deletions
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14
Userland/Utilities/js.cpp
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@ -14,7 +14,7 @@
#include <LibCore/File.h>
#include <LibCore/StandardPaths.h>
#include <LibJS/AST.h>
#include <LibJS/Bytecode/Block.h>
#include <LibJS/Bytecode/BasicBlock.h>
#include <LibJS/Bytecode/Generator.h>
#include <LibJS/Bytecode/Interpreter.h>
#include <LibJS/Console.h>
@ -494,15 +494,15 @@ static bool parse_and_run(JS::Interpreter& interpreter, const StringView& source
program->dump(0);
if (s_dump_bytecode || s_run_bytecode) {
auto block = JS::Bytecode::Generator::generate(*program);
VERIFY(block);
if (s_dump_bytecode)
block->dump();
auto unit = JS::Bytecode::Generator::generate(*program);
if (s_dump_bytecode) {
for (auto& block : unit.basic_blocks)
block.dump();
}
if (s_run_bytecode) {
JS::Bytecode::Interpreter bytecode_interpreter(interpreter.global_object());
bytecode_interpreter.run(*block);
bytecode_interpreter.run(unit);
}
return true;