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Commit8413400

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Updated comments & implemented CPU.Reset().

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main.go

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`‎main.go‎`

Lines changed: 20 additions & 21 deletions

Original file line number	Diff line number	Diff line change
`@@ -1,20 +1,13 @@`
`1`	`1`	`//`
`2`		`-// This is a simple port of the virtual machine to golang`
	`2`	`+// This is a simple port of the virtual machineinterpreterto golang.`
`3`	`3`	`//`
`4`		`-// It is not complete, because it only operates upon some of the examples.`
`5`		`-//`
`6`		`-// For example the loop script:`
	`4`	`+// For example the loop script could be compiled to bytecode like this:`
`7`	`5`	`//`
`8`	`6`	`// ./compiler examples/loop.in`
`9`		`-// go run main.go examples/loop.raw`
`10`		`-//`
`11`		`-// And the jumping script:`
`12`	`7`	`//`
`13`		`-// ./compiler examples/jump.in`
`14`		`-// go run main.go examples/jump.raw`
	`8`	`+// Once that has been done it can be executed:`
`15`	`9`	`//`
`16`		`-// Still it shows how you could "port" this software, if you had a pressing`
`17`		`-// need for a Golang based VM.`
	`10`	`+// go run main.go examples/loop.raw`
`18`	`11`	`//`
`19`	`12`	`// Steve`
`20`	`13`	`// --`
`@@ -34,7 +27,7 @@ import (`
`34`	`27`	`"time"`
`35`	`28`	`)`
`36`	`29`
`37`		`-// Flags holds the CPU flags.`
	`30`	`+// Flags holds the CPU flags - of which we only have one.`
`38`	`31`	`typeFlagsstruct {`
`39`	`32`	`// Zero-flag`
`40`	`33`	`zbool`
`@@ -83,7 +76,7 @@ type CPU struct {`
`83`	`76`	`// Global functions`
`84`	`77`	`//`
`85`	`78`
`86`		-// debugPrintf outputs some debugging details `$DEBUG=1`.
	`79`	+// debugPrintf outputs some debugging detailswhen`$DEBUG=1`.
`87`	`80`	`funcdebugPrintf(fmt_string,args...interface{}) {`
`88`	`81`	`ifos.Getenv("DEBUG")=="" {`
`89`	`82`	`return`
`@@ -93,7 +86,7 @@ func debugPrintf(fmt_ string, args ...interface{}) {`
`93`	`86`	`}`
`94`	`87`
`95`	`88`	`// Split a line of text into tokens, but keep anything "quoted"`
`96`		`-// together..`
	`89`	`+// together.`
`97`	`90`	`//`
`98`	`91`	`// So this input:`
`99`	`92`	`//`
`@@ -204,22 +197,28 @@ func (s *Stack) Pop() int {`
`204`	`197`	`// CPU / VM functions`
`205`	`198`	`//`
`206`	`199`
`207`		`-// NewCPU returns a new CPU object`
	`200`	`+// NewCPU returns a new CPU object.`
`208`	`201`	`funcNewCPU()*CPU {`
`209`	`202`	`x:=&CPU{}`
	`203`	`+x.Reset()`
	`204`	`+returnx`
	`205`	`+}`
	`206`	`+`
	`207`	`+// Reset sets the CPU into a known-good state, by setting the IP to zero,`
	`208`	`+// and emptying all registers (i.e. setting them to zero too.)`
	`209`	`+func (c*CPU)Reset() {`
`210`	`210`	`fori:=0;i<16;i++ {`
`211`		`-x.regs[i].SetInt(0)`
	`211`	`+c.regs[i].SetInt(0)`
`212`	`212`	`}`
`213`		`-x.ip=0`
`214`		`-x.stack=NewStack()`
`215`		`-returnx`
	`213`	`+c.ip=0`
	`214`	`+c.stack=NewStack()`
`216`	`215`	`}`
`217`	`216`
`218`		`-// Load opens the named program andloads it`
	`217`	`+// Load opens the named program andexecutes it.`
`219`	`218`	`func (c*CPU)Load(pathstring) {`
`220`	`219`
`221`	`220`	`// Ensure we reset our state.`
`222`		`-c.ip=0`
	`221`	`+c.Reset()`
`223`	`222`
`224`	`223`	`// Load the file`
`225`	`224`	`b,err:=ioutil.ReadFile(path)`

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`‎main.go‎`

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