From cdb180465dd01631138e0aeb58d9365468daa873 Mon Sep 17 00:00:00 2001
From: volodya-lombrozo <volodya.lombrozo@gmail.com>
Date: Sat, 2 Nov 2024 13:03:43 +0300
Subject: [PATCH] feat(#750): add StackMapFrames abstraction

---
 .../bytecode/BytecodeMethod.java              |  8 ++-
 .../bytecode/StackMapFrames.java              | 60 +++++++++++++++++++
 2 files changed, 67 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/org/eolang/jeo/representation/bytecode/StackMapFrames.java

diff --git a/src/main/java/org/eolang/jeo/representation/bytecode/BytecodeMethod.java b/src/main/java/org/eolang/jeo/representation/bytecode/BytecodeMethod.java
index 3b009edb1..53d988c64 100644
--- a/src/main/java/org/eolang/jeo/representation/bytecode/BytecodeMethod.java
+++ b/src/main/java/org/eolang/jeo/representation/bytecode/BytecodeMethod.java
@@ -367,7 +367,13 @@ BytecodeMaxs currentMaxs() {
      * @return Frames.
      */
     List<BytecodeFrame> computeFrames() {
-        return Collections.emptyList();
+        return new StackMapFrames(
+            this.instructions,
+            this.tryblocks.stream()
+                .filter(BytecodeTryCatchBlock.class::isInstance)
+                .map(BytecodeTryCatchBlock.class::cast)
+                .collect(Collectors.toList())
+        ).frames();
     }
 
     /**
diff --git a/src/main/java/org/eolang/jeo/representation/bytecode/StackMapFrames.java b/src/main/java/org/eolang/jeo/representation/bytecode/StackMapFrames.java
new file mode 100644
index 000000000..53fd2f251
--- /dev/null
+++ b/src/main/java/org/eolang/jeo/representation/bytecode/StackMapFrames.java
@@ -0,0 +1,60 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016-2024 Objectionary.com
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package org.eolang.jeo.representation.bytecode;
+
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * This class knows how to compute the stack map frames from the bytecode entries.
+ * @since 0.6
+ */
+final class StackMapFrames {
+
+    /**
+     * The instructions.
+     */
+    private final List<BytecodeEntry> instructions;
+
+    /**
+     * The try-catch blocks.
+     */
+    private final List<BytecodeTryCatchBlock> blocks;
+
+    StackMapFrames(
+        final List<BytecodeEntry> entries,
+        final List<BytecodeTryCatchBlock> blocks
+    ) {
+        this.instructions = entries;
+        this.blocks = blocks;
+    }
+
+    /**
+     * Compute the frames.
+     * @return The list of frames.
+     */
+    List<BytecodeFrame> frames() {
+        return Collections.emptyList();
+    }
+}