add error struct for failed assertions #13

	# Do not run this workflow on pull request since this workflow has permission to modify contents.
	on:
	push:
	branches:
	- main

	permissions:
	# deployments permission to deploy GitHub pages website
	deployments: write
	# contents permission to update benchmark contents in gh-pages branch
	contents: write

	jobs:
	benchmark:
	name: Performance regression check
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Install libs
	run: \|
	sudo apt-get update
	sudo apt-get install build-essential libreadline-dev
	- name: Compile
	run: make TARGET=release
	- name: Run benchmark
	run: \|
	gettimems() { date '+%s%3N'; }

	NTIMES=1
	sum=0
	for i in $(seq $NTIMES); do
	before=$(gettimems)
	CBCVM_PATH=lib ./cbcvm bf.rbcvm bench.b
	after=$(gettimems)
	elapsed=$((after - before))
	sum=$((sum + elapsed))
	done

	avg=$((sum / NTIMES))
	printf '[{"name":"bench.b","value":%f,"unit":"ms"}]' $avg > output.txt
	# gh-pages branch is updated and pushed automatically with extracted benchmark data
	- name: Store benchmark result
	uses: benchmark-action/github-action-benchmark@v1
	with:
	name: c-bytecode-vm benchmark
	tool: customSmallerIsBetter
	output-file-path: output.txt
	# Access token to deploy GitHub Pages branch
	github-token: ${{ secrets.GITHUB_TOKEN }}
	# Push and deploy GitHub pages branch automatically
	auto-push: true
	comment-on-alert: true

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