Simulator Build

This page describes how to build V8 for execution on the built-in RISC-V simulator. It is assumed that you have already followed the steps to get the source.

Install prerequisites

The following script will use apt to install any packages required for building v8. You will need sudo access to install the packages.

cd $V8_ROOT/v8
./build/install-build-deps.sh

Build v8 for RISC-V Simulation of an x86-64 Host

Configure with GN

The following commands build an x86-64 executable for v8 which generates RISC-V code and executes it within a builtin RISC-V simulator. We use gn to configure the build as such:

gn gen out/riscv64.sim --args='is_component_build=false is_debug=true target_cpu="x64" v8_target_cpu="riscv64" use_goma=false goma_dir="None"'

If you plan to use gdb to debug v8, it will be useful to add the flag v8_optimized_debug=false to the arguments. Without this, the code is optimized by default and will be difficult to debug.

Build with Ninja

Next, we use ninja to complete the build:

ninja -C out/riscv64.sim -j8

Note, -j8 specifies to use 8 cores for the build and should be adjusted for your build machine.

Next, continue to Run Tests

Build v8 Release Simulated Build

Build with gm.py

To only compile the release build (note: this only builds d8 but none of the test binaries):

tools/dev/gm.py riscv64.release

To compile and immediately run tests of the release build:

tools/dev/gm.py riscv64.release.check