QuickJS

A community-driven QuickJS fork.

Optimizations

In addition to the relevant features and optimizations in the TODO file, the more important optimizations are:

• Column number
• Basic Debugger API
• Poly IC
  • Self Poly IC
  • Prototype Poly IC
• Replace malloc To mimalloc
• Improve The Performance Of GC

In our plan, we first complete the above optimizations and then gradually add the remaining parts.

Develop

Clone

git clone --recurse-submodules https://github.com/openquickjs/quickjs.git

Install Build Tools

brew install cmake ninja # macOS
sudo apt install cmake ninja-build # Ubuntu

The Windows build environment is not yet officially supported.

Build

bash scripts/build.sh # build quickjs qjs
bash scripts/test.sh # run test262 tests

You can find libquickjs.a in lib folder and qjs / run-test262 in bin folder.

1. If you're using Visual Studio Code, you can use the CMake Tools extension to build the program.
2. If you're using CLion, you can open the project directly to build the program.

Using VSCode or CLion for regular development is recommended.

Debug

Install Debug Tools if you need.

brew install lldb # macOS
sudo apt install lldb # Ubuntu

If you're using VSCode, you can use the C/C++ and Code LLDB extension to debug.

Tests

Average memory statistics for 75250 tests:

NAME                    COUNT     SIZE
memory allocated         1011   124975  (123.6 per block)
memory used               967   117030  (0 overhead, 8.2 average slack)
atoms                     532    26858  (50.5 per atom)
objects                   172    12425  (72.2 per object)
properties              876    15798  (5.1 per object)
shapes                   60    13809  (230.2 per shape)
bytecode functions         13     1685
bytecode                 13      931  (71.6 per function)
C functions               100
arrays                      1
fast arrays               1
elements                  1       16  (1.0 per fast array)

Result: 515/75250 errors, 1392 excluded, 7972 skipped, 515 new

Benchmark

• Apple M1 Pro
• macOS Monterey 12.2.1
• Clang 13.0.0 arm64-apple-darwin21.3.0

	bellard/quickjs (2788d71)	openwebf/quickjs (latest)
Richards	1188	1457
Crypto	1443	1527
RayTrace	744	1995
NavierStokes	2775	2979
DeltaBlue	1100	1595
Total score	1312	1840 (+40.2%)
File Size(KB)	1.3M	1.4M