HIGHLY EXPERIMENTAL - Debugger

_examples/wasm/server/main.go

@@ -1,6 +1,6 @@
 // Copyright © 2018 The ELPS authors
 
-// A basic HTTP server.
+// A basic HTTP delveserver.
 // By default, it serves the current working directory on port 8080.
 package main
 

cmd/run.go

@@ -4,6 +4,7 @@ package cmd
 
 import (
 	"fmt"
+	"github.com/luthersystems/elps/lisp/x/debugger"
 	"io/ioutil"
 	"os"
 
@@ -14,8 +15,11 @@ import (
 )
 
 var (
-	runExpression bool
-	runPrint      bool
+	runExpression   bool
+	runPrint        bool
+	runDebugger     bool
+	runDebuggerPort int
+	runDebuggerType string
 )
 
 // runCmd represents the run command
@@ -24,6 +28,11 @@ var runCmd = &cobra.Command{
 	Short: "Run lisp code",
 	Long:  `Run lisp code provided supplied via the command line or a file.`,
 	Run: func(cmd *cobra.Command, args []string) {
+		if len(args) == 0 {
+			fmt.Fprintln(os.Stderr, "No file specified")
+			os.Exit(1)
+		}
+
 		env := lisp.NewEnv(nil)
 		reader := parser.NewReader()
 		env.Runtime.Reader = reader
@@ -43,13 +52,31 @@ var runCmd = &cobra.Command{
 			fmt.Fprintln(os.Stderr, rc)
 			os.Exit(1)
 		}
+
+		var debugInst lisp.Debugger
+		if runDebugger {
+			var mode debugger.DebugMode
+			switch debugger.DebugMode(runDebuggerType) {
+			case debugger.DebugModeDelve:
+				mode = debugger.DebugModeDelve
+			case debugger.DebugModeDAP:
+				mode = debugger.DebugModeDAP
+			default:
+				fmt.Fprintln(os.Stderr, "Invalid debugger. Specify delve or dap")
+				os.Exit(1)
+			}
+			debugInst = debugger.NewDebugger(env, fmt.Sprintf(":%d", runDebuggerPort), mode)
+		}
 		for i := range args {
 			res := env.LoadFile(args[i])
 			if res.Type == lisp.LError {
 				(*lisp.ErrorVal)(res).WriteTrace(os.Stderr)
 				os.Exit(1)
 			}
 		}
+		if runDebugger {
+			debugInst.Complete()
+		}
 	},
 }
 
@@ -79,4 +106,10 @@ func init() {
 		"Interpret arguments as lisp expressions")
 	runCmd.Flags().BoolVarP(&runPrint, "print", "p", false,
 		"Print expression values to stdout")
+	runCmd.Flags().BoolVarP(&runDebugger, "debugger", "d", false,
+		"Enable the debugger")
+	runCmd.Flags().IntVarP(&runDebuggerPort, "debugger.listen", "l", 8883,
+		"Port for the debugger")
+	runCmd.Flags().StringVarP(&runDebuggerType, "debugger.type", "t", "dap",
+		"Type of debugger (delve or dap)")
 }

go.mod

@@ -7,15 +7,16 @@ require (
 	github.com/chzyer/readline v0.0.0-20160726135117-62c6fe619375
 	github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/fsnotify/fsnotify v1.4.7 // indirect
+	github.com/go-delve/delve v1.4.0
 	github.com/golang-collections/collections v0.0.0-20130729185459-604e922904d3
+	github.com/google/go-dap v0.2.0
 	github.com/hashicorp/hcl v0.0.0-20180404174102-ef8a98b0bbce // indirect
-	github.com/inconshreveable/mousetrap v1.0.0 // indirect
-	github.com/magiconair/properties v1.8.0 // indirect
+	github.com/magiconair/properties v1.8.0
 	github.com/mitchellh/go-homedir v0.0.0-20180523094522-3864e76763d9
 	github.com/mitchellh/mapstructure v0.0.0-20180511142126-bb74f1db0675 // indirect
 	github.com/pelletier/go-toml v1.1.0 // indirect
 	github.com/prataprc/goparsec v0.0.0-20180208125142-3db61e7995f1
+	github.com/sirupsen/logrus v0.0.0-20180523074243-ea8897e79973
 	github.com/spf13/afero v1.1.0 // indirect
 	github.com/spf13/cast v1.2.0 // indirect
 	github.com/spf13/cobra v0.0.3

go.sum

@@ -8,71 +8,112 @@ github.com/chzyer/readline v0.0.0-20160726135117-62c6fe619375/go.mod h1:nSuG5e5P
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 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
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 golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd h1:r7DufRZuZbWB7j439YfAzP8RPDa9unLkpwQKUYbIMPI=
 golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190626221950-04f50cda93cb h1:fgwFCsaw9buMuxNd6+DQfAuSFqbNiQZpcgJQAgJsK6k=
+golang.org/x/sys v0.0.0-20190626221950-04f50cda93cb/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
@@ -81,14 +122,28 @@ golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGm
 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+golang.org/x/tools v0.0.0-20191127201027-ecd32218bd7f/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
+gopkg.in/airbrake/gobrake.v2 v2.0.9 h1:7z2uVWwn7oVeeugY1DtlPAy5H+KYgB1KeKTnqjNatLo=
+gopkg.in/airbrake/gobrake.v2 v2.0.9/go.mod h1:/h5ZAUhDkGaJfjzjKLSjv6zCL6O0LLBxU4K+aSYdM/U=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2 h1:OAj3g0cR6Dx/R07QgQe8wkA9RNjB2u4i700xBkIT4e0=
+gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2/go.mod h1:Xk6kEKp8OKb+X14hQBKWaSkCsqBpgog8nAV2xsGOxlo=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=

lisp/env.go

@@ -767,10 +767,14 @@ func (env *LEnv) EvalSExpr(s *LVal) *LVal {
 	fun := call.Cells[0] // call is not an empty expression -- fun is known LFun
 	args := call
 	args.Cells = args.Cells[1:]
-	if (env.Runtime.Profiler != nil) {
+	if env.Runtime.Profiler != nil {
 		env.Runtime.Profiler.Start(fun)
 		defer env.Runtime.Profiler.End(fun)
 	}
+	if env.Runtime.Debugger != nil {
+		env.Runtime.Debugger.Start(s, fun)
+		defer env.Runtime.Debugger.End(fun)
+	}
 	switch fun.FunType {
 	case LFunNone:
 		return env.FunCall(fun, args)

lisp/profiler.go

@@ -18,3 +18,16 @@ type Profiler interface {
 	End(function *LVal)
 }
 
+// Interface for a debugger
+type Debugger interface {
+	// Is the profiler enabled?
+	IsEnabled() bool
+	// End the session and output summary lines
+	Complete() error
+	// Is done
+	Done() bool
+	// Marks the start of a process
+	Start(expr *LVal, function *LVal)
+	// Marks the end of a process
+	End(function *LVal)
+}

lisp/runtime.go

@@ -20,6 +20,7 @@ type Runtime struct {
 	Reader   Reader
 	Library  SourceLibrary
 	Profiler Profiler
+	Debugger Debugger
 	numenv   atomicCounter
 	numsym   atomicCounter
 }