Implement enough of SEXP, RDSReader, and Compiler to pass tests

.neoconf.json

@@ -0,0 +1,13 @@
+{
+  "lspconfig": {
+    "jdtls": {
+      "java.configuration.runtimes": [
+        {
+          "name": "JavaSE-21",
+          "path": "/home/krikava/.asdf/installs/java/openjdk-21",
+          "default": true
+        }
+      ]
+    }
+  }
+}

pom.xml

@@ -86,6 +86,9 @@
                                 <include>pom.xml</include>
                                 <include>README.md</include>
                             </includes>
+                            <excludes>
+                                <exclude>**/*.rds</exclude>
+                            </excludes>
                             <trimTrailingWhitespace/>
                             <endWithNewline/>
                         </format>

src/main/java/Main.java

@@ -0,0 +1,32 @@
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+import org.prlprg.rds.RDSReader;
+import org.prlprg.sexp.SEXP;
+import org.prlprg.util.IO;
+
+public class Main {
+
+    public static void main(String[] args) throws Exception {
+        new Main().doMain(args);
+    }
+
+    private void doMain(String[] args) throws Exception {
+        compile(args[0]);
+    }
+
+    private void compile(String file) throws IOException {
+        try (var input = new FileInputStream(file)) {
+            compile(input);
+        }
+    }
+
+    private void compile(InputStream input) throws IOException {
+        compile(RDSReader.readStream(IO.maybeDecompress(input)));
+    }
+
+    private void compile(SEXP sexp) {
+        System.out.println(sexp);
+    }
+}

src/main/java/org/prlprg/RPlatform.java

@@ -0,0 +1,8 @@
+package org.prlprg;
+
+public final class RPlatform {
+    public static final int INT_MAX = ~(1 << 31);
+
+    private RPlatform() {
+    }
+}

src/main/java/org/prlprg/bc/Bc.java

@@ -1,15 +1,77 @@
 package org.prlprg.bc;
 
 import com.google.common.collect.ImmutableList;
+import com.google.common.primitives.ImmutableIntArray;
+import org.prlprg.sexp.SEXP;
 
-// TODO: Remove stub with Sexp from branch `filip`
-class Sexp {}
+import java.util.*;
 
 /** A complete R bytecode, consisting of a version, array of instructions and associated data, and constants. */
-public record Bc(BcCode code, ImmutableList<Sexp> constants) {
+public record Bc(BcCode code, ConstPool consts) {
     /**
      * The only version of R bytecodes we support, which is also the latest version.
      * The bytecode's version is denoted by the first integer in its code.
      */
-    static int R_BC_VERSION = 13;
+    public static final int R_BC_VERSION = 12;
+
+    /** Create from the raw GNU-R representation, bytecodes not including the initial version number. */
+    public static Bc fromRaw(ImmutableIntArray bytecodes, List<SEXP> consts) throws BcFromRawException {
+        var poolAndMakeIdx = ConstPool.fromRaw(consts);
+        var pool = poolAndMakeIdx.a();
+        var makePoolIdx = poolAndMakeIdx.b();
+        try {
+            return new Bc(BcCode.fromRaw(bytecodes, makePoolIdx), pool);
+        } catch (BcFromRawException e) {
+            throw new BcFromRawException("malformed bytecode\nConstants: " + pool, e);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return code() + "\n" + consts;
+    }
+
+    /** Equivalent to `CodeBuffer` in other projects */
+    public static class Builder {
+        private final BcCode.Builder code = new BcCode.Builder();
+        private final ConstPool.Builder consts = new ConstPool.Builder();
+
+        /**
+         * Append a constant and return its index.
+         */
+        public <S extends SEXP> ConstPool.TypedIdx<S> addConst(S c) {
+            return consts.add(c);
+        }
+
+        /**
+         * Append an instruction.
+         */
+        public void addInstr(BcInstr instr) {
+            code.add(instr);
+        }
+
+        /**
+         * Append a collection of constants and return its index.
+         */
+        public <S extends SEXP> ImmutableList<ConstPool.TypedIdx<S>> addAllConsts(Collection<? extends S> c) {
+            return consts.addAll(c);
+        }
+
+        /**
+         * Append instructions.
+         */
+        public void addAllInstrs(Collection<? extends BcInstr> c) {
+            code.addAll(c);
+        }
+
+        /**
+         * Finish building the bytecode.
+         *
+         * @return The bytecode.
+         */
+        public Bc build() {
+            return new Bc(code.build(), consts.build());
+        }
+    }
+
 }

src/main/java/org/prlprg/bc/BcCode.java

@@ -2,6 +2,8 @@
 
 import com.google.common.collect.ForwardingList;
 import com.google.common.collect.ImmutableList;
+import com.google.common.primitives.ImmutableIntArray;
+import com.google.errorprone.annotations.CanIgnoreReturnValue;
 
 import javax.annotation.concurrent.Immutable;
 import java.util.Collection;
@@ -24,6 +26,37 @@ protected List<BcInstr> delegate() {
         return instrs;
     }
 
+    /** Create from the raw GNU-R representation, not including the initial version number.
+     *
+     * @param makePoolIdx A function to create pool indices from raw integers
+     */
+    static BcCode fromRaw(ImmutableIntArray bytecodes, ConstPool.MakeIdx makePoolIdx)
+            throws BcFromRawException {
+        var builder = new Builder();
+        int i = 0;
+        while (i < bytecodes.length()) {
+            try {
+                var instrAndI = BcInstrs.fromRaw(bytecodes, i, makePoolIdx);
+                builder.add(instrAndI.a());
+                i = instrAndI.b();
+            } catch (BcFromRawException e) {
+                throw new BcFromRawException(
+                        "malformed bytecode at " + i + "\nBytecode up to this point: " + builder.build(),
+                        e);
+            }
+        }
+        return builder.build();
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder("=== CODE ===");
+        for (BcInstr instr : instrs) {
+            sb.append("\n").append(instr);
+        }
+        return sb.toString();
+    }
+
     /**
      * A builder class for creating BcArray instances.
      * <p>
@@ -41,6 +74,7 @@ public Builder() {
         /**
          * Append an instruction.
          */
+        @CanIgnoreReturnValue
         public Builder add(BcInstr instr) {
             builder.add(instr);
             return this;
@@ -49,13 +83,14 @@ public Builder add(BcInstr instr) {
         /**
          * Append instructions.
          */
+        @CanIgnoreReturnValue
         public Builder addAll(Collection<? extends BcInstr> c) {
             builder.addAll(c);
             return this;
         }
 
         /**
-         * Build the array.
+         * Finish building the array.
          *
          * @return The array.
          */

src/main/java/org/prlprg/bc/BcFromRawException.java

@@ -0,0 +1,11 @@
+package org.prlprg.bc;
+
+public class BcFromRawException extends RuntimeException {
+    public BcFromRawException(String message) {
+        super(message);
+    }
+
+    public BcFromRawException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}