V8 RISC-V Tools

This directory is for tools developed specifically for the development of the RISC-V backend.

analyze.py

This is a simple tool to parse debug output from the RISC-V assembler and simulator to generate information useful for debugging.

Current features:

• Call stack

To use the tool, first execute your test with the flags --print-all-code and --trace-sim, dumping the output to a file. Then execute this tool, passing it that dump file and it will generate the call stack to stdout.

$ cctest --print-all-code -trace-sim test-interpreter-intrinsics/Call &> out
$ analyze.py out

The full usage information can be printed using --help:

usage: analyze.py [-h] [--inline] [--target TARGET] [--print-host-calls]
                  [--fp]
                  logfile

positional arguments:
  logfile

optional arguments:
  -h, --help          show this help message and exit
  --inline            Print comments inline with trace
  --target TARGET     Specify the target architecture
  --print-host-calls  Print info about calls to host functions
  --fp                Print floating point arguments and return values

CountInstr.py

This is a simple tool to collect statistics and compare codes generated by two different backends.

usage:

python3 ./v8-riscv-tools/CountInstr.py path_to_riscv_d8 path_to_mips_d8  [args of d8]

example:

python3 ./v8-riscv-tools/CountInstr.py ./out/riscv64.sim/d8 ./out/mips64el.debug/d8 test.js --test --enable-slow-check

collect-convertible.py

This is a simple tool to collect statistics on instructions that can be directly rewritten into C-extension instructions.

To use the tool, first execute your test with the flags --print-all-code or --print-code, dumping the output to a file. Then execute this tool, passing it that dump file and it will print statistics on convertible instructions.

$ cctest --print-all-code test-interpreter-intrinsics/Call &> out.log
$ collect-convertible.py out.log

The full usage information can be printed using --help:

usage: collect-convertible.py [-h] [-v] logfile

positional arguments:
  logfile

optional arguments:
  -h, --help     show this help message and exit
  -v, --verbose  print all convertible instructions