fix(ssr): adjust call stack size defer threshold

fix #8545

Author: yyx990803

src/server/render-context.js

@@ -66,55 +66,54 @@ export class RenderContext {
   }
 
   next () {
-    const lastState = this.renderStates[this.renderStates.length - 1]
-    if (isUndef(lastState)) {
-      return this.done()
-    }
-    /* eslint-disable no-case-declarations */
-    switch (lastState.type) {
-      case 'Element':
-      case 'Fragment':
-        const { children, total } = lastState
-        const rendered = lastState.rendered++
-        if (rendered < total) {
-          this.renderNode(children[rendered], false, this)
-        } else {
+    // eslint-disable-next-line
+    while (true) {
+      const lastState = this.renderStates[this.renderStates.length - 1]
+      if (isUndef(lastState)) {
+        return this.done()
+      }
+      /* eslint-disable no-case-declarations */
+      switch (lastState.type) {
+        case 'Element':
+        case 'Fragment':
+          const { children, total } = lastState
+          const rendered = lastState.rendered++
+          if (rendered < total) {
+            return this.renderNode(children[rendered], false, this)
+          } else {
+            this.renderStates.pop()
+            if (lastState.type === 'Element') {
+              return this.write(lastState.endTag, this.next)
+            }
+          }
+          break
+        case 'Component':
           this.renderStates.pop()
-          if (lastState.type === 'Element') {
-            this.write(lastState.endTag, this.next)
+          this.activeInstance = lastState.prevActive
+          break
+        case 'ComponentWithCache':
+          this.renderStates.pop()
+          const { buffer, bufferIndex, componentBuffer, key } = lastState
+          const result = {
+            html: buffer[bufferIndex],
+            components: componentBuffer[bufferIndex]
+          }
+          this.cache.set(key, result)
+          if (bufferIndex === 0) {
+            // this is a top-level cached component,
+            // exit caching mode.
+            this.write.caching = false
           } else {
-            this.next()
+            // parent component is also being cached,
+            // merge self into parent's result
+            buffer[bufferIndex - 1] += result.html
+            const prev = componentBuffer[bufferIndex - 1]
+            result.components.forEach(c => prev.add(c))
           }
-        }
-        break
-      case 'Component':
-        this.renderStates.pop()
-        this.activeInstance = lastState.prevActive
-        this.next()
-        break
-      case 'ComponentWithCache':
-        this.renderStates.pop()
-        const { buffer, bufferIndex, componentBuffer, key } = lastState
-        const result = {
-          html: buffer[bufferIndex],
-          components: componentBuffer[bufferIndex]
-        }
-        this.cache.set(key, result)
-        if (bufferIndex === 0) {
-          // this is a top-level cached component,
-          // exit caching mode.
-          this.write.caching = false
-        } else {
-          // parent component is also being cached,
-          // merge self into parent's result
-          buffer[bufferIndex - 1] += result.html
-          const prev = componentBuffer[bufferIndex - 1]
-          result.components.forEach(c => prev.add(c))
-        }
-        buffer.length = bufferIndex
-        componentBuffer.length = bufferIndex
-        this.next()
-        break
+          buffer.length = bufferIndex
+          componentBuffer.length = bufferIndex
+          break
+      }
     }
   }
 }

src/server/write.js

@@ -1,6 +1,6 @@
 /* @flow */
 
-const MAX_STACK_DEPTH = 1000
+const MAX_STACK_DEPTH = 900
 const noop = _ => _
 
 const defer = typeof process !== 'undefined' && process.nextTick