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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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11
Userland/Libraries/LibJS/Bytecode/Interpreter.h
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@ -6,7 +6,7 @@
#pragma once
#include <AK/NonnullOwnPtrVector.h>
#include "Generator.h"
#include <LibJS/Bytecode/Label.h>
#include <LibJS/Bytecode/Register.h>
#include <LibJS/Forward.h>
@ -28,12 +28,15 @@ public:
GlobalObject& global_object() { return m_global_object; }
VM& vm() { return m_vm; }
Value run(Bytecode::Block const&);
Value run(Bytecode::ExecutionUnit const&);
ALWAYS_INLINE Value& accumulator() { return reg(Register::accumulator()); }
Value& reg(Register const& r) { return registers()[r.index()]; }
void jump(Label const& label) { m_pending_jump = label.address(); }
void jump(Label const& label)
{
m_pending_jump = &label.block();
}
void do_return(Value return_value) { m_return_value = return_value; }
private:
@ -42,7 +45,7 @@ private:
VM& m_vm;
GlobalObject& m_global_object;
NonnullOwnPtrVector<RegisterWindow> m_register_windows;
Optional<size_t> m_pending_jump;
Optional<BasicBlock const*> m_pending_jump;
Value m_return_value;
};