From 2dc02865abc02622d6454bcffd2768f25fad9346 Mon Sep 17 00:00:00 2001
From: Nevkontakte <aleks@nevkontakte.com>
Date: Mon, 1 Aug 2022 19:21:07 +0100
Subject: [PATCH 1/3] Use ES2015 syntax for more compact context save/restore.

---
 compiler/package.go | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/compiler/package.go b/compiler/package.go
index a042f216d..eff8daade 100644
--- a/compiler/package.go
+++ b/compiler/package.go
@@ -823,10 +823,8 @@ func translateFunction(typ *ast.FuncType, recv *ast.Ident, body *ast.BlockStmt,
 			functionName = " $b"
 		}
 		var stores, loads string
-		for _, v := range c.localVars {
-			loads += fmt.Sprintf("%s = $f.%s; ", v, v)
-			stores += fmt.Sprintf("$f.%s = %s; ", v, v)
-		}
+		loads = fmt.Sprintf("({%s} = $f); ", strings.Join(c.localVars, ", "))
+		stores = fmt.Sprintf("$f = {...$f, %s};", strings.Join(c.localVars, ", "))
 		prefix = prefix + " var $f, $c = false; if (this !== undefined && this.$blk !== undefined) { $f = this; $c = true; " + loads + "}"
 		suffix = " if ($f === undefined) { $f = { $blk: " + funcRef + " }; } " + stores + "return $f;" + suffix
 	}

From cea2ae1dcb12842f8d884c1e4e9dbd8d89fadaff Mon Sep 17 00:00:00 2001
From: Nevkontakte <aleks@nevkontakte.com>
Date: Sun, 7 Aug 2022 13:51:06 +0100
Subject: [PATCH 2/3] Further compactify blocking function context save/restore
 code.

This change deduplicates variable declaration with restoration from
saved context for blocking functions. This removes a significant source
of duplicated code in each blocking function intro.

We also introduce a helper function $restore to eliminate some
repetitive snippets of generated code.
---
 compiler/package.go             | 28 +++++++++++++++++++---------
 compiler/prelude/goroutines.go  | 15 +++++++++++++++
 compiler/prelude/prelude_min.go |  2 +-
 3 files changed, 35 insertions(+), 10 deletions(-)

diff --git a/compiler/package.go b/compiler/package.go
index eff8daade..5c9d88e1a 100644
--- a/compiler/package.go
+++ b/compiler/package.go
@@ -805,7 +805,7 @@ func translateFunction(typ *ast.FuncType, recv *ast.Ident, body *ast.BlockStmt,
 
 	if len(c.Flattened) != 0 {
 		c.localVars = append(c.localVars, "$s")
-		prefix = prefix + " $s = 0;"
+		prefix = prefix + " $s = $s || 0;"
 	}
 
 	if c.HasDefer {
@@ -816,17 +816,27 @@ func translateFunction(typ *ast.FuncType, recv *ast.Ident, body *ast.BlockStmt,
 		}
 	}
 
+	localVarDefs := "" // Function-local var declaration at the top.
+
 	if len(c.Blocking) != 0 {
-		c.localVars = append(c.localVars, "$r")
+		localVars := append([]string{}, c.localVars...)
+		// $r is sometimes used as a temporary variable to store blocking call result.
+		// $c indicates that a function is being resumed after a blocking call when set to true.
+		// $f is an object used to save and restore function context for blocking calls.
+		localVars = append(localVars, "$r", "$c", "$f")
+		// If a blocking function is being resumed, initialize local variables from the saved context.
+		localVarDefs = fmt.Sprintf("var {%s} = $restore(this, {%s});\n", strings.Join(localVars, ", "), strings.Join(params, ", "))
+		// If the function gets blocked, save local variables for future.
+		saveContext := fmt.Sprintf("$f = {...$f, $r, %s};", strings.Join(c.localVars, ", "))
+
 		if funcRef == "" {
 			funcRef = "$b"
 			functionName = " $b"
 		}
-		var stores, loads string
-		loads = fmt.Sprintf("({%s} = $f); ", strings.Join(c.localVars, ", "))
-		stores = fmt.Sprintf("$f = {...$f, %s};", strings.Join(c.localVars, ", "))
-		prefix = prefix + " var $f, $c = false; if (this !== undefined && this.$blk !== undefined) { $f = this; $c = true; " + loads + "}"
-		suffix = " if ($f === undefined) { $f = { $blk: " + funcRef + " }; } " + stores + "return $f;" + suffix
+		suffix = " if ($f === undefined) { $f = { $blk: " + funcRef + " }; } " + saveContext + "return $f;" + suffix
+	} else if len(c.localVars) > 0 {
+		// Non-blocking functions simply declare local variables with no need for restore support.
+		localVarDefs = fmt.Sprintf("var %s;\n", strings.Join(c.localVars, ", "))
 	}
 
 	if c.HasDefer {
@@ -863,8 +873,8 @@ func translateFunction(typ *ast.FuncType, recv *ast.Ident, body *ast.BlockStmt,
 	if suffix != "" {
 		bodyOutput = bodyOutput + strings.Repeat("\t", c.pkgCtx.indentation+1) + "/* */" + suffix + "\n"
 	}
-	if len(c.localVars) != 0 {
-		bodyOutput = fmt.Sprintf("%svar %s;\n", strings.Repeat("\t", c.pkgCtx.indentation+1), strings.Join(c.localVars, ", ")) + bodyOutput
+	if localVarDefs != "" {
+		bodyOutput = strings.Repeat("\t", c.pkgCtx.indentation+1) + localVarDefs + bodyOutput
 	}
 
 	c.pkgCtx.escapingVars = prevEV
diff --git a/compiler/prelude/goroutines.go b/compiler/prelude/goroutines.go
index aca4cb7a9..e31090934 100644
--- a/compiler/prelude/goroutines.go
+++ b/compiler/prelude/goroutines.go
@@ -223,6 +223,21 @@ var $block = function() {
   $curGoroutine.asleep = true;
 };
 
+var $restore = function(context, params) {
+  if (context !== undefined && context.$blk !== undefined) {
+    return {
+      $f: context,
+      $c: true,
+      ...context,
+    };
+  } else {
+    return {
+      $c: false,
+      ...params,
+    };
+  }
+}
+
 var $send = function(chan, value) {
   if (chan.$closed) {
     $throwRuntimeError("send on closed channel");
diff --git a/compiler/prelude/prelude_min.go b/compiler/prelude/prelude_min.go
index 706338fcf..f89fdabd8 100644
--- a/compiler/prelude/prelude_min.go
+++ b/compiler/prelude/prelude_min.go
@@ -3,4 +3,4 @@
 package prelude
 
 // Minified is an uglifyjs-minified version of Prelude.
-const Minified = "Error.stackTraceLimit=1/0;var $global,$module,$NaN=NaN;if(\"undefined\"!=typeof window?$global=window:\"undefined\"!=typeof self?$global=self:\"undefined\"!=typeof global?($global=global).require=require:$global=this,void 0===$global||void 0===$global.Array)throw new Error(\"no global object found\");if(\"undefined\"!=typeof module&&($module=module),!$global.fs&&$global.require)try{var fs=$global.require(\"fs\");\"object\"==typeof fs&&null!==fs&&0!==Object.keys(fs).length&&($global.fs=fs)}catch(e){}if(!$global.fs){var outputBuf=\"\",decoder=new TextDecoder(\"utf-8\");$global.fs={constants:{O_WRONLY:-1,O_RDWR:-1,O_CREAT:-1,O_TRUNC:-1,O_APPEND:-1,O_EXCL:-1},writeSync:function(e,n){var r=(outputBuf+=decoder.decode(n)).lastIndexOf(\"\\n\");return-1!=r&&(console.log(outputBuf.substr(0,r)),outputBuf=outputBuf.substr(r+1)),n.length},write:function(e,n,r,t,i,a){0===r&&t===n.length&&null===i?a(null,this.writeSync(e,n)):a(enosys())}}}var $throwRuntimeError,$linknames={},$packages={},$idCounter=0,$keys=function(e){return e?Object.keys(e):[]},$flushConsole=function(){},$throwNilPointerError=function(){$throwRuntimeError(\"invalid memory address or nil pointer dereference\")},$call=function(e,n,r){return e.apply(n,r)},$makeFunc=function(e){return function(){return $externalize(e(this,new($sliceType($jsObjectPtr))($global.Array.prototype.slice.call(arguments,[]))),$emptyInterface)}},$unused=function(e){},$print=console.log;if(void 0!==$global.process&&$global.require)try{var util=$global.require(\"util\");$print=function(){$global.process.stderr.write(util.format.apply(this,arguments))}}catch(e){}var $println=console.log,$initAllLinknames=function(){for(var e=$keys($packages),n=0;n<e.length;n++){var r=$packages[e[n]].$initLinknames;\"function\"==typeof r&&r()}},$mapArray=function(e,n){for(var r=new e.constructor(e.length),t=0;t<e.length;t++)r[t]=n(e[t]);return r},$methodVal=function(e,n){var 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i=e.$array,a=e.$offset,o=e.$length+t,c=e.$capacity;if(o>c)if(a=0,c=Math.max(o,e.$capacity<1024?2*e.$capacity:Math.floor(5*e.$capacity/4)),e.$array.constructor===Array){(i=e.$array.slice(e.$offset,e.$offset+e.$length)).length=c;for(var $=e.constructor.elem.zero,u=e.$length;u<c;u++)i[u]=$()}else(i=new e.$array.constructor(c)).set(e.$array.subarray(e.$offset,e.$offset+e.$length));$copyArray(i,n,a+e.$length,r,t,e.constructor.elem);var l=new e.constructor(i);return l.$offset=a,l.$length=o,l.$capacity=c,l},$equal=function(e,n,r){if(r===$jsObjectPtr)return e===n;switch(r.kind){case $kindComplex64:case $kindComplex128:return e.$real===n.$real&&e.$imag===n.$imag;case $kindInt64:case $kindUint64:return e.$high===n.$high&&e.$low===n.$low;case $kindArray:if(e.length!==n.length)return!1;for(var t=0;t<e.length;t++)if(!$equal(e[t],n[t],r.elem))return!1;return!0;case $kindStruct:for(t=0;t<r.fields.length;t++){var i=r.fields[t];if(!$equal(e[i.prop],n[i.prop],i.typ))return!1}return!0;case $kindInterface:return $interfaceIsEqual(e,n);default:return e===n}},$interfaceIsEqual=function(e,n){return e===$ifaceNil||n===$ifaceNil?e===n:e.constructor===n.constructor&&(e.constructor===$jsObjectPtr?e.object===n.object:(e.constructor.comparable||$throwRuntimeError(\"comparing uncomparable type \"+e.constructor.string),$equal(e.$val,n.$val,e.constructor)))},$min=Math.min,$mod=function(e,n){return e%n},$parseInt=parseInt,$parseFloat=function(e){return void 0!==e&&null!==e&&e.constructor===Number?e:parseFloat(e)},$froundBuf=new Float32Array(1),$fround=Math.fround||function(e){return $froundBuf[0]=e,$froundBuf[0]},$imul=Math.imul||function(e,n){var r=65535&e,t=65535&n;return r*t+((e>>>16&65535)*t+r*(n>>>16&65535)<<16>>>0)>>0},$floatKey=function(e){return e!=e?\"NaN$\"+ ++$idCounter:String(e)},$flatten64=function(e){return 4294967296*e.$high+e.$low},$shiftLeft64=function(e,n){return 0===n?e:n<32?new e.constructor(e.$high<<n|e.$low>>>32-n,e.$low<<n>>>0):n<64?new 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$needsExternalization(n.elem)?$mapArray($sliceToNativeArray(e),function(e){return $externalize(e,n.elem,r)}):$sliceToNativeArray(e);case $kindString:if($isASCII(e))return e;var c,$=\"\";for(a=0;a<e.length;a+=c[1]){var u=(c=$decodeRune(e,a))[0];if(u>65535){var l=Math.floor((u-65536)/1024)+55296,s=(u-65536)%1024+56320;$+=String.fromCharCode(l,s)}else $+=String.fromCharCode(u)}return $;case $kindStruct:var f=$packages.time;if(void 0!==f&&e.constructor===f.Time.ptr){var d=$div64(e.UnixNano(),new $Int64(0,1e6));return new Date($flatten64(d))}var p={},h=function(e,n){if(n===$jsObjectPtr)return e;switch(n.kind){case $kindPtr:return e===n.nil?p:h(e.$get(),n.elem);case $kindStruct:var r=n.fields[0];return h(e[r.prop],r.typ);case $kindInterface:return h(e.$val,e.constructor);default:return p}},k=h(e,n);if(k!==p)return k;if(void 0!==r)return r(e);k={};for(a=0;a<n.fields.length;a++){var y=n.fields[a];y.exported&&(k[y.name]=$externalize(e[y.prop],y.typ,r))}return k}$throwRuntimeError(\"cannot externalize \"+n.string)},$externalizeFunction=function(e,n,r,t){return e===$throwNilPointerError?null:(void 0===e.$externalizeWrapper&&($checkForDeadlock=!1,e.$externalizeWrapper=function(){for(var i=[],a=0;a<n.params.length;a++){if(n.variadic&&a===n.params.length-1){for(var o=n.params[a].elem,c=[],$=a;$<arguments.length;$++)c.push($internalize(arguments[$],o,t));i.push(new n.params[a](c));break}i.push($internalize(arguments[a],n.params[a],t))}var u=e.apply(r?this:void 0,i);switch(n.results.length){case 0:return;case 1:return $externalize($copyIfRequired(u,n.results[0]),n.results[0],t);default:for(a=0;a<n.results.length;a++)u[a]=$externalize($copyIfRequired(u[a],n.results[a]),n.results[a],t);return u}}),e.$externalizeWrapper)},$internalize=function(e,n,r,t,i){if(n===$jsObjectPtr)return e;if(n===$jsObjectPtr.elem&&$throwRuntimeError(\"cannot internalize js.Object, use *js.Object instead\"),e&&void 0!==e.__internal_object__)return $assertType(e.__internal_object__,n,!1);var a=$packages.time;if(void 0!==a&&n===a.Time)return null!==e&&void 0!==e&&e.constructor===Date||$throwRuntimeError(\"cannot internalize time.Time from \"+typeof e+\", must be Date\"),a.Unix(new $Int64(0,0),new $Int64(0,1e6*e.getTime()));if(void 0===t&&(t=new Map),t.has(n)||t.set(n,new Map),t.get(n).has(e))return t.get(n).get(e);switch(n.kind){case $kindBool:return!!e;case $kindInt:return parseInt(e);case $kindInt8:return parseInt(e)<<24>>24;case $kindInt16:return parseInt(e)<<16>>16;case $kindInt32:return parseInt(e)>>0;case $kindUint:return parseInt(e);case $kindUint8:return parseInt(e)<<24>>>24;case $kindUint16:return parseInt(e)<<16>>>16;case $kindUint32:case $kindUintptr:return parseInt(e)>>>0;case $kindInt64:case $kindUint64:return new n(0,e);case $kindFloat32:case $kindFloat64:return parseFloat(e);case $kindArray:return e.length!==n.len&&$throwRuntimeError(\"got array with wrong size from JavaScript native\"),$mapArray(e,function(e){return $internalize(e,n.elem,i)});case $kindFunc:return function(){for(var t=[],a=0;a<n.params.length;a++){if(n.variadic&&a===n.params.length-1){for(var o=n.params[a].elem,c=arguments[a],$=0;$<c.$length;$++)t.push($externalize(c.$array[c.$offset+$],o,i));break}t.push($externalize(arguments[a],n.params[a],i))}var u=e.apply(r,t);switch(n.results.length){case 0:return;case 1:return $internalize(u,n.results[0],i);default:for(a=0;a<n.results.length;a++)u[a]=$internalize(u[a],n.results[a],i);return u}};case $kindInterface:if(0!==n.methods.length&&$throwRuntimeError(\"cannot internalize \"+n.string),null===e)return $ifaceNil;if(void 0===e)return new $jsObjectPtr(void 0);switch(e.constructor){case Int8Array:return new($sliceType($Int8))(e);case Int16Array:return new($sliceType($Int16))(e);case Int32Array:return new($sliceType($Int))(e);case Uint8Array:return new($sliceType($Uint8))(e);case Uint16Array:return new($sliceType($Uint16))(e);case Uint32Array:return new($sliceType($Uint))(e);case Float32Array:return new($sliceType($Float32))(e);case Float64Array:return new($sliceType($Float64))(e);case Array:return $internalize(e,$sliceType($emptyInterface),i);case Boolean:return new $Bool(!!e);case Date:return void 0===a?new $jsObjectPtr(e):new a.Time($internalize(e,a.Time,i));case function(){}.constructor:var o=$funcType([$sliceType($emptyInterface)],[$jsObjectPtr],!0);return new o($internalize(e,o,i));case Number:return new $Float64(parseFloat(e));case String:return new $String($internalize(e,$String,i));default:if($global.Node&&e instanceof $global.Node)return new $jsObjectPtr(e);var c=$mapType($String,$emptyInterface);return new c($internalize(e,c,r,t,i))}case $kindMap:var $={};t.get(n).set(e,$);for(var u=$keys(e),l=0;l<u.length;l++){var s=$internalize(u[l],n.key,r,t,i);$[n.key.keyFor(s)]={k:s,v:$internalize(e[u[l]],n.elem,r,t,i)}}return $;case $kindPtr:if(n.elem.kind===$kindStruct)return $internalize(e,n.elem,i);case $kindSlice:return new n($mapArray(e,function(e){return $internalize(e,n.elem,i)}));case $kindString:if(e=String(e),$isASCII(e))return e;var f=\"\";for(l=0;l<e.length;){var d=e.charCodeAt(l);if(55296<=d&&d<=56319){var p=e.charCodeAt(l+1);f+=$encodeRune(1024*(d-55296)+p-56320+65536),l+=2}else f+=$encodeRune(d),l++}return f;case $kindStruct:var h={},k=function(n){if(n===$jsObjectPtr)return e;switch(n===$jsObjectPtr.elem&&$throwRuntimeError(\"cannot internalize js.Object, use *js.Object instead\"),n.kind){case $kindPtr:return k(n.elem);case $kindStruct:var r=n.fields[0],t=k(r.typ);if(t!==h){var i=new n.ptr;return i[r.prop]=t,i}return h;default:return h}},y=k(n);if(y!==h)return y}$throwRuntimeError(\"cannot internalize \"+n.string)},$copyIfRequired=function(e,n){if(e&&e.constructor&&e.constructor.copy)return new e.constructor($clone(e.$val,e.constructor));if(n.copy){var r=n.zero();return n.copy(r,e),r}return e},$isASCII=function(e){for(var n=0;n<e.length;n++)if(e.charCodeAt(n)>=128)return!1;return!0};\n"

From 3067214a31275e4899b14a79a345a6c19f14d07f Mon Sep 17 00:00:00 2001
From: Nevkontakte <aleks@nevkontakte.com>
Date: Sat, 13 Aug 2022 21:09:17 +0100
Subject: [PATCH 3/3] Optimize goroutine switching performance.

Avoid use of the `{...context}` syntax, which appears to have a
significant performance penalty when used in a tight loop.

In addition, apply a few further size and performance optimizations:
skip unpacking $f from the context and instead fully construct it in the
function epilogue.
---
 compiler/package.go             | 18 ++++++++++--------
 compiler/prelude/goroutines.go  | 12 ++----------
 compiler/prelude/prelude_min.go |  2 +-
 3 files changed, 13 insertions(+), 19 deletions(-)

diff --git a/compiler/package.go b/compiler/package.go
index 5c9d88e1a..8a0524478 100644
--- a/compiler/package.go
+++ b/compiler/package.go
@@ -819,21 +819,23 @@ func translateFunction(typ *ast.FuncType, recv *ast.Ident, body *ast.BlockStmt,
 	localVarDefs := "" // Function-local var declaration at the top.
 
 	if len(c.Blocking) != 0 {
+		if funcRef == "" {
+			funcRef = "$b"
+			functionName = " $b"
+		}
+
 		localVars := append([]string{}, c.localVars...)
+		// There are several special variables involved in handling blocking functions:
 		// $r is sometimes used as a temporary variable to store blocking call result.
 		// $c indicates that a function is being resumed after a blocking call when set to true.
 		// $f is an object used to save and restore function context for blocking calls.
-		localVars = append(localVars, "$r", "$c", "$f")
+		localVars = append(localVars, "$r")
 		// If a blocking function is being resumed, initialize local variables from the saved context.
-		localVarDefs = fmt.Sprintf("var {%s} = $restore(this, {%s});\n", strings.Join(localVars, ", "), strings.Join(params, ", "))
+		localVarDefs = fmt.Sprintf("var {%s, $c} = $restore(this, {%s});\n", strings.Join(localVars, ", "), strings.Join(params, ", "))
 		// If the function gets blocked, save local variables for future.
-		saveContext := fmt.Sprintf("$f = {...$f, $r, %s};", strings.Join(c.localVars, ", "))
+		saveContext := fmt.Sprintf("var $f = {$blk: "+funcRef+", $c: true, $r, %s};", strings.Join(c.localVars, ", "))
 
-		if funcRef == "" {
-			funcRef = "$b"
-			functionName = " $b"
-		}
-		suffix = " if ($f === undefined) { $f = { $blk: " + funcRef + " }; } " + saveContext + "return $f;" + suffix
+		suffix = " " + saveContext + "return $f;" + suffix
 	} else if len(c.localVars) > 0 {
 		// Non-blocking functions simply declare local variables with no need for restore support.
 		localVarDefs = fmt.Sprintf("var %s;\n", strings.Join(c.localVars, ", "))
diff --git a/compiler/prelude/goroutines.go b/compiler/prelude/goroutines.go
index e31090934..6478aba7a 100644
--- a/compiler/prelude/goroutines.go
+++ b/compiler/prelude/goroutines.go
@@ -225,17 +225,9 @@ var $block = function() {
 
 var $restore = function(context, params) {
   if (context !== undefined && context.$blk !== undefined) {
-    return {
-      $f: context,
-      $c: true,
-      ...context,
-    };
-  } else {
-    return {
-      $c: false,
-      ...params,
-    };
+    return context;
   }
+  return params;
 }
 
 var $send = function(chan, value) {
diff --git a/compiler/prelude/prelude_min.go b/compiler/prelude/prelude_min.go
index f89fdabd8..9e94905c7 100644
--- a/compiler/prelude/prelude_min.go
+++ b/compiler/prelude/prelude_min.go
@@ -3,4 +3,4 @@
 package prelude
 
 // Minified is an uglifyjs-minified version of Prelude.
-const Minified = "Error.stackTraceLimit=1/0;var $global,$module,$NaN=NaN;if(\"undefined\"!=typeof window?$global=window:\"undefined\"!=typeof self?$global=self:\"undefined\"!=typeof global?($global=global).require=require:$global=this,void 0===$global||void 0===$global.Array)throw new Error(\"no global object found\");if(\"undefined\"!=typeof module&&($module=module),!$global.fs&&$global.require)try{var fs=$global.require(\"fs\");\"object\"==typeof fs&&null!==fs&&0!==Object.keys(fs).length&&($global.fs=fs)}catch(e){}if(!$global.fs){var outputBuf=\"\",decoder=new TextDecoder(\"utf-8\");$global.fs={constants:{O_WRONLY:-1,O_RDWR:-1,O_CREAT:-1,O_TRUNC:-1,O_APPEND:-1,O_EXCL:-1},writeSync:function(e,n){var r=(outputBuf+=decoder.decode(n)).lastIndexOf(\"\\n\");return-1!=r&&(console.log(outputBuf.substr(0,r)),outputBuf=outputBuf.substr(r+1)),n.length},write:function(e,n,r,t,i,a){0===r&&t===n.length&&null===i?a(null,this.writeSync(e,n)):a(enosys())}}}var $throwRuntimeError,$linknames={},$packages={},$idCounter=0,$keys=function(e){return e?Object.keys(e):[]},$flushConsole=function(){},$throwNilPointerError=function(){$throwRuntimeError(\"invalid memory address or nil pointer dereference\")},$call=function(e,n,r){return e.apply(n,r)},$makeFunc=function(e){return function(){return $externalize(e(this,new($sliceType($jsObjectPtr))($global.Array.prototype.slice.call(arguments,[]))),$emptyInterface)}},$unused=function(e){},$print=console.log;if(void 0!==$global.process&&$global.require)try{var util=$global.require(\"util\");$print=function(){$global.process.stderr.write(util.format.apply(this,arguments))}}catch(e){}var $println=console.log,$initAllLinknames=function(){for(var e=$keys($packages),n=0;n<e.length;n++){var r=$packages[e[n]].$initLinknames;\"function\"==typeof r&&r()}},$mapArray=function(e,n){for(var r=new e.constructor(e.length),t=0;t<e.length;t++)r[t]=n(e[t]);return r},$methodVal=function(e,n){var r=e.$methodVals||{};e.$methodVals=r;var t=r[n];return void 0!==t?t:(t=e[n].bind(e),r[n]=t,t)},$methodExpr=function(e,n){var r=e.prototype[n];return void 0===r.$expr&&(r.$expr=function(){$stackDepthOffset--;try{return e.wrapped&&(arguments[0]=new e(arguments[0])),Function.call.apply(r,arguments)}finally{$stackDepthOffset++}}),r.$expr},$ifaceMethodExprs={},$ifaceMethodExpr=function(e){var n=$ifaceMethodExprs[\"$\"+e];return void 0===n&&(n=$ifaceMethodExprs[\"$\"+e]=function(){$stackDepthOffset--;try{return Function.call.apply(arguments[0][e],arguments)}finally{$stackDepthOffset++}}),n},$subslice=function(e,n,r,t){if(void 0===r&&(r=e.$length),void 0===t&&(t=e.$capacity),(n<0||r<n||t<r||r>e.$capacity||t>e.$capacity)&&$throwRuntimeError(\"slice bounds out of range\"),e===e.constructor.nil)return e;var i=new e.constructor(e.$array);return i.$offset=e.$offset+n,i.$length=r-n,i.$capacity=t-n,i},$substring=function(e,n,r){return(n<0||r<n||r>e.length)&&$throwRuntimeError(\"slice bounds out of 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t=e.charCodeAt(n+1);if(t!=t||t<128||192<=t)return[65533,1];if(r<224)return(a=(31&r)<<6|63&t)<=127?[65533,1]:[a,2];var i=e.charCodeAt(n+2);if(i!=i||i<128||192<=i)return[65533,1];if(r<240)return(a=(15&r)<<12|(63&t)<<6|63&i)<=2047?[65533,1]:55296<=a&&a<=57343?[65533,1]:[a,3];var a,o=e.charCodeAt(n+3);return o!=o||o<128||192<=o?[65533,1]:r<248?(a=(7&r)<<18|(63&t)<<12|(63&i)<<6|63&o)<=65535||1114111<a?[65533,1]:[a,4]:[65533,1]},$encodeRune=function(e){return(e<0||e>1114111||55296<=e&&e<=57343)&&(e=65533),e<=127?String.fromCharCode(e):e<=2047?String.fromCharCode(192|e>>6,128|63&e):e<=65535?String.fromCharCode(224|e>>12,128|e>>6&63,128|63&e):String.fromCharCode(240|e>>18,128|e>>12&63,128|e>>6&63,128|63&e)},$stringToBytes=function(e){for(var n=new Uint8Array(e.length),r=0;r<e.length;r++)n[r]=e.charCodeAt(r);return n},$bytesToString=function(e){if(0===e.$length)return\"\";for(var n=\"\",r=0;r<e.$length;r+=1e4)n+=String.fromCharCode.apply(void 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o=n.$real/n.$imag,c=n.$real*o+n.$imag;return new e.constructor((e.$real*o+e.$imag)/c,(e.$imag*o-e.$real)/c)}o=n.$imag/n.$real,c=n.$imag*o+n.$real;return new e.constructor((e.$imag*o+e.$real)/c,(e.$imag-e.$real*o)/c)},$kindBool=1,$kindInt=2,$kindInt8=3,$kindInt16=4,$kindInt32=5,$kindInt64=6,$kindUint=7,$kindUint8=8,$kindUint16=9,$kindUint32=10,$kindUint64=11,$kindUintptr=12,$kindFloat32=13,$kindFloat64=14,$kindComplex64=15,$kindComplex128=16,$kindArray=17,$kindChan=18,$kindFunc=19,$kindInterface=20,$kindMap=21,$kindPtr=22,$kindSlice=23,$kindString=24,$kindStruct=25,$kindUnsafePointer=26,$methodSynthesizers=[],$addMethodSynthesizer=function(e){null!==$methodSynthesizers?$methodSynthesizers.push(e):e()},$synthesizeMethods=function(){$methodSynthesizers.forEach(function(e){e()}),$methodSynthesizers=null},$ifaceKeyFor=function(e){if(e===$ifaceNil)return\"nil\";var n=e.constructor;return n.string+\"$\"+n.keyFor(e.$val)},$identity=function(e){return 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$kindChan:(c=function(e){this.$val=e}).wrapped=!0,c.keyFor=$idKey,c.init=function(e,n,r){c.elem=e,c.sendOnly=n,c.recvOnly=r};break;case $kindFunc:(c=function(e){this.$val=e}).wrapped=!0,c.init=function(e,n,r){c.params=e,c.results=n,c.variadic=r,c.comparable=!1};break;case $kindInterface:(c={implementedBy:{},missingMethodFor:{}}).keyFor=$ifaceKeyFor,c.init=function(e){c.methods=e,e.forEach(function(e){$ifaceNil[e.prop]=$throwNilPointerError})};break;case $kindMap:(c=function(e){this.$val=e}).wrapped=!0,c.init=function(e,n){c.key=e,c.elem=n,c.comparable=!1};break;case $kindPtr:(c=o||function(e,n,r){this.$get=e,this.$set=n,this.$target=r,this.$val=this}).keyFor=$idKey,c.init=function(e){c.elem=e,c.wrapped=e.kind===$kindArray,c.nil=new c($throwNilPointerError,$throwNilPointerError)};break;case $kindSlice:(c=function(e){e.constructor!==c.nativeArray&&(e=new 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r={};n.forEach(function(e){r[e.prop]={get:$throwNilPointerError,set:$throwNilPointerError}}),c.ptr.nil=Object.create(o.prototype,r),c.ptr.nil.$val=c.ptr.nil,$addMethodSynthesizer(function(){var e=function(e,n,r){void 0===e.prototype[n.prop]&&(e.prototype[n.prop]=function(){var e=this.$val[r.prop];return r.typ===$jsObjectPtr&&(e=new $jsObjectPtr(e)),void 0===e.$val&&(e=new r.typ(e)),e[n.prop].apply(e,arguments)})};n.forEach(function(n){n.embedded&&($methodSet(n.typ).forEach(function(r){e(c,r,n),e(c.ptr,r,n)}),$methodSet($ptrType(n.typ)).forEach(function(r){e(c.ptr,r,n)}))})})};break;default:$panic(new $String(\"invalid kind: \"+n))}switch(n){case $kindBool:case $kindMap:c.zero=function(){return!1};break;case $kindInt:case $kindInt8:case $kindInt16:case $kindInt32:case $kindUint:case $kindUint8:case $kindUint16:case $kindUint32:case $kindUintptr:case $kindUnsafePointer:case $kindFloat32:case $kindFloat64:c.zero=function(){return 0};break;case $kindString:c.zero=function(){return\"\"};break;case $kindInt64:case $kindUint64:case $kindComplex64:case $kindComplex128:var $=new c(0,0);c.zero=function(){return $};break;case $kindPtr:case $kindSlice:c.zero=function(){return c.nil};break;case $kindChan:c.zero=function(){return $chanNil};break;case $kindFunc:c.zero=function(){return $throwNilPointerError};break;case $kindInterface:c.zero=function(){return $ifaceNil};break;case $kindArray:c.zero=function(){var e=$nativeArray(c.elem.kind);if(e!==Array)return new e(c.len);for(var n=new Array(c.len),r=0;r<c.len;r++)n[r]=c.elem.zero();return n};break;case $kindStruct:c.zero=function(){return new c.ptr};break;default:$panic(new $String(\"invalid kind: \"+n))}return c.id=$typeIDCounter,$typeIDCounter++,c.size=e,c.kind=n,c.string=r,c.named=t,c.pkg=i,c.exported=a,c.methods=[],c.methodSetCache=null,c.comparable=!0,c},$methodSet=function(e){if(null!==e.methodSetCache)return e.methodSetCache;var n={},r=e.kind===$kindPtr;if(r&&e.elem.kind===$kindInterface)return e.methodSetCache=[],[];for(var t=[{typ:r?e.elem:e,indirect:r}],i={};t.length>0;){var a=[],o=[];t.forEach(function(e){if(!i[e.typ.string])switch(i[e.typ.string]=!0,e.typ.named&&(o=o.concat(e.typ.methods),e.indirect&&(o=o.concat($ptrType(e.typ).methods))),e.typ.kind){case $kindStruct:e.typ.fields.forEach(function(n){if(n.embedded){var r=n.typ,t=r.kind===$kindPtr;a.push({typ:t?r.elem:r,indirect:e.indirect||t})}});break;case $kindInterface:o=o.concat(e.typ.methods)}}),o.forEach(function(e){void 0===n[e.name]&&(n[e.name]=e)}),t=a}return 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$kindInt:return Int32Array;case $kindInt8:return Int8Array;case $kindInt16:return Int16Array;case $kindInt32:return Int32Array;case $kindUint:return Uint32Array;case $kindUint8:return Uint8Array;case $kindUint16:return Uint16Array;case $kindUint32:case $kindUintptr:return Uint32Array;case $kindFloat32:return Float32Array;case $kindFloat64:return Float64Array;default:return Array}},$toNativeArray=function(e,n){var r=$nativeArray(e);return r===Array?n:new r(n)},$arrayTypes={},$arrayType=function(e,n){var r=e.id+\"$\"+n,t=$arrayTypes[r];return void 0===t&&(t=$newType(12,$kindArray,\"[\"+n+\"]\"+e.string,!1,\"\",!1,null),$arrayTypes[r]=t,t.init(e,n)),t},$chanType=function(e,n,r){var t=(r?\"<-\":\"\")+\"chan\"+(n?\"<- \":\" \");n||r||\"<\"!=e.string[0]?t+=e.string:t+=\"(\"+e.string+\")\";var i=n?\"SendChan\":r?\"RecvChan\":\"Chan\",a=e[i];return void 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n=$mapArray(e,function(e){return e.pkg+\",\"+e.name+\",\"+e.typ.id}).join(\"$\"),r=$interfaceTypes[n];if(void 0===r){var t=\"interface {}\";0!==e.length&&(t=\"interface { \"+$mapArray(e,function(e){return(\"\"!==e.pkg?e.pkg+\".\":\"\")+e.name+e.typ.string.substr(4)}).join(\"; \")+\" }\"),r=$newType(8,$kindInterface,t,!1,\"\",!1,null),$interfaceTypes[n]=r,r.init(e)}return r},$emptyInterface=$interfaceType([]),$ifaceNil={},$error=$newType(8,$kindInterface,\"error\",!0,\"\",!1,null);$error.init([{prop:\"Error\",name:\"Error\",pkg:\"\",typ:$funcType([],[$String],!1)}]);var $panicValue,$jsObjectPtr,$jsErrorPtr,$mapTypes={},$mapType=function(e,n){var r=e.id+\"$\"+n.id,t=$mapTypes[r];return void 0===t&&(t=$newType(4,$kindMap,\"map[\"+e.string+\"]\"+n.string,!1,\"\",!1,null),$mapTypes[r]=t,t.init(e,n)),t},$makeMap=function(e,n){for(var r={},t=0;t<n.length;t++){var i=n[t];r[e(i.k)]=i}return r},$ptrType=function(e){var n=e.ptr;return void 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r={};n.forEach(function(e){r[e.prop]={get:$throwNilPointerError,set:$throwNilPointerError}}),c.ptr.nil=Object.create(o.prototype,r),c.ptr.nil.$val=c.ptr.nil,$addMethodSynthesizer(function(){var e=function(e,n,r){void 0===e.prototype[n.prop]&&(e.prototype[n.prop]=function(){var e=this.$val[r.prop];return r.typ===$jsObjectPtr&&(e=new $jsObjectPtr(e)),void 0===e.$val&&(e=new r.typ(e)),e[n.prop].apply(e,arguments)})};n.forEach(function(n){n.embedded&&($methodSet(n.typ).forEach(function(r){e(c,r,n),e(c.ptr,r,n)}),$methodSet($ptrType(n.typ)).forEach(function(r){e(c.ptr,r,n)}))})})};break;default:$panic(new $String(\"invalid kind: \"+n))}switch(n){case $kindBool:case $kindMap:c.zero=function(){return!1};break;case $kindInt:case $kindInt8:case $kindInt16:case $kindInt32:case $kindUint:case $kindUint8:case $kindUint16:case $kindUint32:case $kindUintptr:case $kindUnsafePointer:case $kindFloat32:case $kindFloat64:c.zero=function(){return 0};break;case 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n={},r=e.kind===$kindPtr;if(r&&e.elem.kind===$kindInterface)return e.methodSetCache=[],[];for(var t=[{typ:r?e.elem:e,indirect:r}],i={};t.length>0;){var a=[],o=[];t.forEach(function(e){if(!i[e.typ.string])switch(i[e.typ.string]=!0,e.typ.named&&(o=o.concat(e.typ.methods),e.indirect&&(o=o.concat($ptrType(e.typ).methods))),e.typ.kind){case $kindStruct:e.typ.fields.forEach(function(n){if(n.embedded){var r=n.typ,t=r.kind===$kindPtr;a.push({typ:t?r.elem:r,indirect:e.indirect||t})}});break;case $kindInterface:o=o.concat(e.typ.methods)}}),o.forEach(function(e){void 0===n[e.name]&&(n[e.name]=e)}),t=a}return 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n=$mapArray(e,function(e){return e.pkg+\",\"+e.name+\",\"+e.typ.id}).join(\"$\"),r=$interfaceTypes[n];if(void 0===r){var t=\"interface {}\";0!==e.length&&(t=\"interface { \"+$mapArray(e,function(e){return(\"\"!==e.pkg?e.pkg+\".\":\"\")+e.name+e.typ.string.substr(4)}).join(\"; \")+\" }\"),r=$newType(8,$kindInterface,t,!1,\"\",!1,null),$interfaceTypes[n]=r,r.init(e)}return r},$emptyInterface=$interfaceType([]),$ifaceNil={},$error=$newType(8,$kindInterface,\"error\",!0,\"\",!1,null);$error.init([{prop:\"Error\",name:\"Error\",pkg:\"\",typ:$funcType([],[$String],!1)}]);var $panicValue,$jsObjectPtr,$jsErrorPtr,$mapTypes={},$mapType=function(e,n){var r=e.id+\"$\"+n.id,t=$mapTypes[r];return void 0===t&&(t=$newType(4,$kindMap,\"map[\"+e.string+\"]\"+n.string,!1,\"\",!1,null),$mapTypes[r]=t,t.init(e,n)),t},$makeMap=function(e,n){for(var r={},t=0;t<n.length;t++){var i=n[t];r[e(i.k)]=i}return r},$ptrType=function(e){var n=e.ptr;return void 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