[psi] don't load text for compiled code

use stubs when possible, when stub doesn't contain anything,
decompiled text won't contain it either,
no sense to load

compiler/psi/src/org/jetbrains/kotlin/psi/KtNamedFunction.java

@@ -125,13 +125,17 @@ public class KtNamedFunction extends KtTypeParameterListOwnerStub<KotlinFunction
     @Nullable
     public KtExpression getBodyExpression() {
         KotlinFunctionStub stub = getStub();
-        if (stub != null && !stub.hasBody()) {
-            return null;
+        if (stub != null) {
+            if (!stub.hasBody()) {
+                return null;
+            }
+            if (getContainingKtFile().isCompiled()) {
+                //don't load ast
+                return null;
+            }
         }
 
-        return AstLoadingFilter.forceAllowTreeLoading(this.getContainingFile(), () ->
-                findChildByClass(KtExpression.class)
-        );
+        return findChildByClass(KtExpression.class);
     }
 
     @Nullable

compiler/psi/src/org/jetbrains/kotlin/psi/KtProperty.java

@@ -279,9 +279,7 @@ public class KtProperty extends KtTypeParameterListOwnerStub<KotlinPropertyStub>
             }
         }
 
-        return AstLoadingFilter.forceAllowTreeLoading(this.getContainingFile(), () ->
-                PsiTreeUtil.getNextSiblingOfType(findChildByType(EQ), KtExpression.class)
-        );
+        return PsiTreeUtil.getNextSiblingOfType(findChildByType(EQ), KtExpression.class);
     }
 
     public boolean hasDelegateExpressionOrInitializer() {

compiler/psi/src/org/jetbrains/kotlin/psi/KtPropertyAccessor.java

@@ -89,13 +89,17 @@ public class KtPropertyAccessor extends KtDeclarationStub<KotlinPropertyAccessor
     @Override
     public KtExpression getBodyExpression() {
         KotlinPropertyAccessorStub stub = getStub();
-        if (stub != null && !stub.hasBody()) {
-            return null;
+        if (stub != null) {
+            if (!stub.hasBody()) {
+                return null;
+            }
+
+            if (getContainingKtFile().isCompiled()) {
+                return null;
+            }
         }
 
-        return AstLoadingFilter.forceAllowTreeLoading(this.getContainingFile(), () ->
-                findChildByClass(KtExpression.class)
-        );
+        return  findChildByClass(KtExpression.class);
     }
 
     @Nullable

compiler/psi/src/org/jetbrains/kotlin/psi/psiUtil/psiUtils.kt

@@ -225,6 +225,7 @@ inline fun <reified T : PsiElement> PsiElement.forEachDescendantOfType(
     crossinline canGoInside: (PsiElement) -> Boolean,
     noinline action: (T) -> Unit
 ) {
+    checkDecompiledText()
     this.accept(object : PsiRecursiveElementVisitor() {
         override fun visitElement(element: PsiElement) {
             if (canGoInside(element)) {
@@ -257,6 +258,7 @@ inline fun <reified T : PsiElement> PsiElement.findDescendantOfType(
     crossinline canGoInside: (PsiElement) -> Boolean,
     noinline predicate: (T) -> Boolean = { true }
 ): T? {
+    checkDecompiledText()
     var result: T? = null
     this.accept(object : PsiRecursiveElementWalkingVisitor() {
         override fun visitElement(element: PsiElement) {
@@ -274,6 +276,13 @@ inline fun <reified T : PsiElement> PsiElement.findDescendantOfType(
     return result
 }
 
+fun PsiElement.checkDecompiledText() {
+    val file = containingFile
+    if (file is KtFile && file.isCompiled) {
+        error("Attempt to load decompiled text, please use stubs instead. Decompile process might be slow and should be avoided")
+    }
+}
+
 inline fun <reified T : PsiElement> PsiElement.collectDescendantsOfType(noinline predicate: (T) -> Boolean = { true }): List<T> {
     return collectDescendantsOfType({ true }, predicate)
 }