WIP: kicad_gen is a util to generate schematic.h files from KiCAD netlist files.

Current code contains a lexer and parser for KiCAD's netlist files and code to build a tree of the netlist which can be used for generation.
Contains CMake code for integrating the generation into CMake too.

7 files changed, 847 insertions, 0 deletions

diff --git a/java/pom.xml b/java/pom.xml
new file mode 100644
index 0000000..4821b17
--- /dev/null
+++ b/java/pom.xml
@@ -0,0 +1,87 @@
+<project>
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>io.trygvis.kicad</groupId>
+  <artifactId>kicad-utils</artifactId>
+  <version>1.0-SNAPSHOT</version>
+  <dependencies>
+    <dependency>
+      <groupId>org.antlr</groupId>
+      <artifactId>antlr4</artifactId>
+      <version>${antlr4-runtime.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>org.antlr</groupId>
+      <artifactId>antlr4-runtime</artifactId>
+      <version>${antlr4-runtime.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>com.google.code.findbugs</groupId>
+      <artifactId>jsr305</artifactId>
+      <version>3.0.1</version>
+    </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.12</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+  <properties>
+    <antlr4-runtime.version>4.5.3</antlr4-runtime.version>
+  </properties>
+  <build>
+    <plugins>
+      <plugin>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration>
+          <source>1.8</source>
+          <target>1.8</target>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.antlr</groupId>
+        <artifactId>antlr4-maven-plugin</artifactId>
+        <version>${antlr4-runtime.version}</version>
+        <executions>
+          <execution>
+            <id>gnu</id>
+            <goals>
+              <goal>antlr4</goal>
+            </goals>
+            <configuration>
+              <arguments>
+                <argument>-package</argument>
+                <argument>io.trygvis.ld.antlr</argument>
+              </arguments>
+              <includes>
+                <include>GnuLd*.g4</include>
+              </includes>
+              <sourceDirectory>.</sourceDirectory>
+              <outputDirectory>target/generated-sources/antlr4/io/trygvis/ld/antlr</outputDirectory>
+            </configuration>
+          </execution>
+          <execution>
+            <id>test1</id>
+            <goals>
+              <goal>antlr4</goal>
+            </goals>
+            <configuration>
+              <arguments>
+                <argument>-package</argument>
+                <argument>io.trygvis.ld.test1</argument>
+              </arguments>
+              <includes>
+                <include>**/Test1*.g4</include>
+              </includes>
+              <outputDirectory>target/generated-sources/antlr4/io/trygvis/ld/test1</outputDirectory>
+            </configuration>
+          </execution>
+        </executions>
+        <configuration>
+          <visitor>true</visitor>
+          <outputDirectory>target/generated-sources/antlr4</outputDirectory>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+</project>
diff --git a/java/src/main/java/io/trygvis/ld/CollectingErrorListener.java b/java/src/main/java/io/trygvis/ld/CollectingErrorListener.java
new file mode 100644
index 0000000..968a02b
--- /dev/null
+++ b/java/src/main/java/io/trygvis/ld/CollectingErrorListener.java
@@ -0,0 +1,17 @@
+package io.trygvis.ld;
+
+import org.antlr.v4.runtime.BaseErrorListener;
+import org.antlr.v4.runtime.RecognitionException;
+import org.antlr.v4.runtime.Recognizer;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class CollectingErrorListener extends BaseErrorListener {
+    public final List<String> errors = new ArrayList<>();
+
+    public void syntaxError(Recognizer<?, ?> recognizer, Object offendingSymbol, int line, int charPositionInLine, String msg, RecognitionException e) {
+        String s = line + ":" + charPositionInLine + " " + msg;
+        errors.add(s);
+    }
+}
diff --git a/java/src/main/java/io/trygvis/ld/ElfinfoExprVisitor.java b/java/src/main/java/io/trygvis/ld/ElfinfoExprVisitor.java
new file mode 100644
index 0000000..af5bea5
--- /dev/null
+++ b/java/src/main/java/io/trygvis/ld/ElfinfoExprVisitor.java
@@ -0,0 +1,318 @@
+package io.trygvis.ld;
+
+import io.trygvis.ld.antlr.GnuLdParser;
+import io.trygvis.ld.antlr.GnuLdParserBaseVisitor;
+import org.antlr.v4.runtime.tree.ParseTreeProperty;
+
+import java.math.BigInteger;
+
+class ElfinfoExprVisitor extends GnuLdParserBaseVisitor<ElfinfoExprVisitor> {
+    private BigInteger value;
+    private ParseTreeProperty<BigInteger> es = new ParseTreeProperty<>();
+
+    public static BigInteger evaluate(GnuLdParser.Mustbe_expContext ctx) {
+        ElfinfoExprVisitor v = new ElfinfoExprVisitor();
+        v.visitMustbe_exp(ctx);
+        return v.value();
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpLt(GnuLdParser.ExpLtContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpBlock(GnuLdParser.ExpBlockContext ctx) {
+        return visitChildren(ctx);
+
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpAbsolute(GnuLdParser.ExpAbsoluteContext ctx) {
+        return visitChildren(ctx);
+
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpLog2ceil(GnuLdParser.ExpLog2ceilContext ctx) {
+        return visitChildren(ctx);
+
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpAddr(GnuLdParser.ExpAddrContext ctx) {
+        return visitChildren(ctx);
+
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpDataSegmentEnd(GnuLdParser.ExpDataSegmentEndContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpSub(GnuLdParser.ExpSubContext ctx) {
+        System.out.println("ElfinfoExprVisitor.visitExpSub");
+
+        ElfinfoExprVisitor ret = visitChildren(ctx);
+        BigInteger a = es.removeFrom(ctx.exp(0));
+        BigInteger b = es.removeFrom(ctx.exp(1));
+
+        BigInteger x = a.subtract(b);
+
+        es.put(ctx, x);
+        return ret;
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpDefined(GnuLdParser.ExpDefinedContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpMod(GnuLdParser.ExpModContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpInvert(GnuLdParser.ExpInvertContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpAlign(GnuLdParser.ExpAlignContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpMul(GnuLdParser.ExpMulContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpAnd(GnuLdParser.ExpAndContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpXor(GnuLdParser.ExpXorContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpParen(GnuLdParser.ExpParenContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpMinus(GnuLdParser.ExpMinusContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpDiv(GnuLdParser.ExpDivContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpGe(GnuLdParser.ExpGeContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpMin(GnuLdParser.ExpMinContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpAlignK(GnuLdParser.ExpAlignKContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpNegate(GnuLdParser.ExpNegateContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpName(GnuLdParser.ExpNameContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpOr(GnuLdParser.ExpOrContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpTrinary(GnuLdParser.ExpTrinaryContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpOror(GnuLdParser.ExpOrorContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpDataSegmentAlign(GnuLdParser.ExpDataSegmentAlignContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpLengthExp(GnuLdParser.ExpLengthExpContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpAdd(GnuLdParser.ExpAddContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpLoadaddr(GnuLdParser.ExpLoadaddrContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpGt(GnuLdParser.ExpGtContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpOrigin(GnuLdParser.ExpOriginContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpEq(GnuLdParser.ExpEqContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpMax(GnuLdParser.ExpMaxContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpLshift(GnuLdParser.ExpLshiftContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpSizeofHeaders(GnuLdParser.ExpSizeofHeadersContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpLe(GnuLdParser.ExpLeContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpNe(GnuLdParser.ExpNeContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpAndand(GnuLdParser.ExpAndandContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpRshift(GnuLdParser.ExpRshiftContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpNextParen(GnuLdParser.ExpNextParenContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpAlignof(GnuLdParser.ExpAlignofContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpSegmentStart(GnuLdParser.ExpSegmentStartContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpInt(GnuLdParser.ExpIntContext ctx) {
+        System.out.println("ElfinfoExprVisitor.visitExpInt");
+
+        BigInteger i = parseInt(ctx.INT().getText());
+        es.put(ctx, i);
+
+        return this;
+    }
+
+    public static BigInteger parseInt(String str) {
+        str = str.toLowerCase();
+        int base = 10;
+        if (str.startsWith("0x")) {
+            base = 16;
+            str = str.substring(2);
+        }
+
+        int factor = 1;
+        if (str.endsWith("k")) {
+            factor = 1024;
+            str = str.substring(0, str.length() - 1);
+        } else if (str.endsWith("k")) {
+            factor = 1024 * 1024;
+            str = str.substring(0, str.length() - 1);
+        }
+
+        BigInteger i = new BigInteger(str, base);
+        if (factor > 1) {
+            i = i.multiply(BigInteger.valueOf(factor));
+        }
+        return i;
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpConstant(GnuLdParser.ExpConstantContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpPlus(GnuLdParser.ExpPlusContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpSizeof(GnuLdParser.ExpSizeofContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpDataSegmentRelRoEnd(GnuLdParser.ExpDataSegmentRelRoEndContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitExpAssert(GnuLdParser.ExpAssertContext ctx) {
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoExprVisitor visitMustbe_exp(GnuLdParser.Mustbe_expContext ctx) {
+        ElfinfoExprVisitor ret = visitChildren(ctx);
+
+        value = es.removeFrom(ctx.exp());
+        es.put(ctx, value);
+
+        return ret;
+    }
+
+    public BigInteger value() {
+        if (value != null) {
+            return value;
+        }
+
+        throw new RuntimeException("Something bad happened, probably an unevaluated expression part.");
+    }
+}
diff --git a/java/src/main/java/io/trygvis/ld/ElfinfoGnuLdListener.java b/java/src/main/java/io/trygvis/ld/ElfinfoGnuLdListener.java
new file mode 100644
index 0000000..fe40547
--- /dev/null
+++ b/java/src/main/java/io/trygvis/ld/ElfinfoGnuLdListener.java
@@ -0,0 +1,170 @@
+package io.trygvis.ld;
+
+import io.trygvis.ld.antlr.GnuLdParser;
+import io.trygvis.ld.antlr.GnuLdParserBaseListener;
+import org.antlr.v4.runtime.tree.ParseTreeProperty;
+
+import java.math.BigInteger;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+class ElfinfoGnuLdListener extends GnuLdParserBaseListener {
+    public List<LdLoader.MemoryArea> memoryAreas = new ArrayList<>();
+
+    private final ParseTreeProperty<BigInteger> expr = new ParseTreeProperty<>();
+
+    @Override
+    public void exitExpInt(GnuLdParser.ExpIntContext ctx) {
+//        System.out.println("ElfinfoGnuLdListener.exitExpInt: ctx.INT().getText() = " + ctx.INT().getText());
+        expr.put(ctx, ElfinfoExprVisitor.parseInt(ctx.INT().getText()));
+    }
+
+    @Override
+    public void exitExpSub(GnuLdParser.ExpSubContext ctx) {
+        BigInteger a = expr.get(ctx.exp(0));
+        BigInteger b = expr.get(ctx.exp(1));
+        BigInteger x = a.subtract(b);
+        expr.put(ctx, x);
+    }
+
+    @Override
+    public void exitExpAdd(GnuLdParser.ExpAddContext ctx) {
+        BigInteger a = expr.get(ctx.exp(0));
+        BigInteger b = expr.get(ctx.exp(1));
+        BigInteger x = a.add(b);
+        expr.put(ctx, x);
+    }
+
+    @Override
+    public void exitExpName(GnuLdParser.ExpNameContext ctx) {
+        expr.put(ctx, BigInteger.ZERO);
+    }
+
+    @Override
+    public void exitExpAddr(GnuLdParser.ExpAddrContext ctx) {
+        expr.put(ctx, BigInteger.ZERO);
+    }
+
+    @Override
+    public void exitExpSizeof(GnuLdParser.ExpSizeofContext ctx) {
+        expr.put(ctx, BigInteger.ZERO);
+    }
+
+    @Override
+    public void exitExpLengthExp(GnuLdParser.ExpLengthExpContext ctx) {
+        LdLoader.MemoryArea ma = getMemoryArea(ctx.NAME().getText());
+//        System.out.println("ma.length = " + ma.length);
+        expr.put(ctx, ma.length);
+    }
+
+    @Override
+    public void exitExpOrigin(GnuLdParser.ExpOriginContext ctx) {
+//        System.out.println("ElfinfoGnuLdListener.exitExpOrigin: " + ctx.getText());
+        LdLoader.MemoryArea ma = getMemoryArea(ctx.NAME().getText());
+//        System.out.println("ma.origin = " + ma.origin);
+        expr.put(ctx, ma.origin);
+    }
+
+    private LdLoader.MemoryArea getMemoryArea(String name) {
+        LdLoader.MemoryArea m = null;
+        for (LdLoader.MemoryArea ma : memoryAreas) {
+            if (ma.name.equals(name)) {
+                m = ma;
+            }
+        }
+        if (m == null) {
+            throw new RuntimeException("No such memory area: " + name);
+        }
+        return m;
+    }
+
+    @Override
+    public void enterMustbe_exp(GnuLdParser.Mustbe_expContext ctx) {
+//        System.out.println("ElfinfoGnuLdListener.enterMustbe_exp");
+    }
+
+    @Override
+    public void exitMustbe_exp(GnuLdParser.Mustbe_expContext ctx) {
+//        System.out.println("ElfinfoGnuLdListener.exitMustbe_exp");
+
+        expr.put(ctx, expr.get(ctx.exp()));
+    }
+
+
+    @Override
+    public void enterOrigin_spec(GnuLdParser.Origin_specContext ctx) {
+//        System.out.println("ElfinfoGnuLdListener.enterOrigin_spec");
+    }
+
+    @Override
+    public void exitOrigin_spec(GnuLdParser.Origin_specContext ctx) {
+//        System.out.println("ElfinfoGnuLdListener.exitOrigin_spec");
+    }
+
+    @Override
+    public void enterLength_spec(GnuLdParser.Length_specContext ctx) {
+//        System.out.println("ElfinfoGnuLdListener.enterLength_spec");
+    }
+
+    @Override
+    public void exitLength_spec(GnuLdParser.Length_specContext ctx) {
+//        System.out.println("ElfinfoGnuLdListener.exitLength_spec");
+    }
+
+    @Override
+    public void enterMemory_spec(GnuLdParser.Memory_specContext ctx) {
+//        System.out.println("ElfinfoGnuLdListener.enterMemory_spec");
+    }
+
+    @Override
+    public void exitMemory_spec(GnuLdParser.Memory_specContext ctx) {
+//        System.out.println("ElfinfoGnuLdListener.exitMemory_spec");
+        LdLoader.MemoryArea ma = new LdLoader.MemoryArea();
+        ma.name = ctx.NAME().getText();
+        ma.attributes = attributes;
+//        System.out.println("ctx.origin_spec() = " + ctx.origin_spec());
+        ma.origin = expr.get(ctx.origin_spec().mustbe_exp());
+        ma.length = expr.get(ctx.length_spec().mustbe_exp());
+        System.out.println(ma);
+        memoryAreas.add(ma);
+    }
+
+    LdLoader.MemoryAttribute attribute;
+    boolean attributesInverted;
+    Set<LdLoader.MemoryAttribute> attributes;
+
+    @Override
+    public void exitAttributes_opt(GnuLdParser.Attributes_optContext ctx) {
+//        System.out.println("ElfinfoGnuLdListener.exitAttributes_opt");
+        attributes = new HashSet<>();
+    }
+
+    @Override
+    public void enterAttributeInverted(GnuLdParser.AttributeInvertedContext ctx) {
+//        System.out.println("ElfinfoGnuLdListener.enterAttributeInverted");
+
+        if (!attributes.isEmpty()) {
+            throw new RuntimeException("Attributes for memory areas can only be attributesInverted (with '!') as the first character in a specification; foo(!rw), not foo(x!rw).");
+        }
+//                String name = ctx.name().getText();
+        String name = ctx.NAME().getText();
+//        System.out.println("ctx.ATTRIBUTE().getText() = " + name);
+
+        attributesInverted = true;
+    }
+
+    @Override
+    public void enterAttributeNormal(GnuLdParser.AttributeNormalContext ctx) {
+//        System.out.println("ElfinfoGnuLdListener.enterAttributeNormal");
+
+        String name = ctx.NAME().getText();
+//        System.out.println("ctx.ATTRIBUTE().getText() = " + name);
+        for (int i = 0; i < name.length(); i++) {
+            attribute = LdLoader.MemoryAttribute.valueOf(String.valueOf(Character.toUpperCase(name.charAt(i))));
+            attributes.add(attribute);
+        }
+        attributesInverted = false;
+    }
+}
diff --git a/java/src/main/java/io/trygvis/ld/ElfinfoGnuLdVisitor.java b/java/src/main/java/io/trygvis/ld/ElfinfoGnuLdVisitor.java
new file mode 100644
index 0000000..3062aad
--- /dev/null
+++ b/java/src/main/java/io/trygvis/ld/ElfinfoGnuLdVisitor.java
@@ -0,0 +1,75 @@
+package io.trygvis.ld;
+
+import io.trygvis.ld.antlr.GnuLdParser;
+import io.trygvis.ld.antlr.GnuLdParserBaseVisitor;
+import org.antlr.v4.runtime.tree.ParseTreeProperty;
+
+import java.math.BigInteger;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+public class ElfinfoGnuLdVisitor extends GnuLdParserBaseVisitor<ElfinfoGnuLdVisitor> {
+    public List<LdLoader.MemoryArea> memoryAreas = new ArrayList<>();
+
+    ParseTreeProperty<BigInteger> es = new ParseTreeProperty<>();
+
+    @Override
+    public ElfinfoGnuLdVisitor visitMemory_spec(GnuLdParser.Memory_specContext ctx) {
+        System.out.println("ElfinfoGnuLdBaseVisitor.visitMemory_spec");
+        visitChildren(ctx);
+
+        if (attributesInverted) {
+            // not quite sure how this is supposed to work yet
+            throw new RuntimeException("Inverted memory region attributes is not implemented yet.");
+        }
+
+        LdLoader.MemoryArea ma = new LdLoader.MemoryArea();
+        ma.name = ctx.NAME().getText();
+        ma.attributes = attributes;
+        ma.origin = ElfinfoExprVisitor.evaluate(ctx.origin_spec().mustbe_exp());
+        ma.length = ElfinfoExprVisitor.evaluate(ctx.length_spec().mustbe_exp());
+        System.out.println(ma);
+        memoryAreas.add(ma);
+        return this;
+    }
+
+    LdLoader.MemoryAttribute attribute;
+    boolean attributesInverted;
+    Set<LdLoader.MemoryAttribute> attributes;
+
+    @Override
+    public ElfinfoGnuLdVisitor visitAttributes_opt(GnuLdParser.Attributes_optContext ctx) {
+        System.out.println("ElfinfoGnuLdBaseVisitor.visitAttributes_opt");
+        attributes = new HashSet<>();
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoGnuLdVisitor visitAttributeNormal(GnuLdParser.AttributeNormalContext ctx) {
+        System.out.println("ElfinfoGnuLdBaseVisitor.visitAttributeNormal");
+        String name = ctx.NAME().getText();
+        System.out.println("ctx.ATTRIBUTE().getText() = " + name);
+        for (int i = 0; i < name.length(); i++) {
+            attribute = LdLoader.MemoryAttribute.valueOf(String.valueOf(Character.toUpperCase(name.charAt(i))));
+            attributes.add(attribute);
+        }
+        attributesInverted = false;
+        return visitChildren(ctx);
+    }
+
+    @Override
+    public ElfinfoGnuLdVisitor visitAttributeInverted(GnuLdParser.AttributeInvertedContext ctx) {
+        System.out.println("ElfinfoGnuLdBaseVisitor.visitAttributeInverted");
+        if (!attributes.isEmpty()) {
+            throw new RuntimeException("Attributes for memory areas can only be attributesInverted (with '!') as the first character in a specification; foo(!rw), not foo(x!rw).");
+        }
+//            String name = ctx.name().getText();
+        String name = ctx.NAME().getText();
+        System.out.println("ctx.ATTRIBUTE().getText() = " + name);
+
+        attributesInverted = true;
+        return visitChildren(ctx);
+    }
+}
diff --git a/java/src/main/java/io/trygvis/ld/LdLoader.java b/java/src/main/java/io/trygvis/ld/LdLoader.java
new file mode 100644
index 0000000..0b71720
--- /dev/null
+++ b/java/src/main/java/io/trygvis/ld/LdLoader.java
@@ -0,0 +1,121 @@
+package io.trygvis.ld;
+
+import io.trygvis.ld.antlr.GnuLdLexer;
+import io.trygvis.ld.antlr.GnuLdParser;
+import org.antlr.v4.runtime.ANTLRFileStream;
+import org.antlr.v4.runtime.BufferedTokenStream;
+import org.antlr.v4.runtime.ConsoleErrorListener;
+
+import java.io.File;
+import java.math.BigInteger;
+import java.util.List;
+import java.util.Set;
+
+public class LdLoader {
+
+    public final List<MemoryArea> memoryAreas;
+
+    public LdLoader(List<MemoryArea> memoryAreas) {
+        this.memoryAreas = memoryAreas;
+    }
+
+    public enum MemoryAttribute {
+        R, W, X, A, I,
+    }
+
+    public static class MemoryArea {
+        private final BigInteger MEGA = BigInteger.valueOf(1024 * 1024);
+        private final BigInteger KILO = BigInteger.valueOf(1024);
+
+        String name;
+        BigInteger origin;
+        BigInteger length;
+        Set<MemoryAttribute> attributes;
+
+        @Override
+        public String toString() {
+            return "MemoryArea{" +
+                    "name='" + name + '\'' +
+                    ", origin=" + origin +
+                    ", length=" + length +
+                    ", attributes='" + attributes + '\'' +
+                    '}';
+        }
+
+        public String prettyOrigin() {
+            if (origin == null) {
+                return "";
+            }
+            String hex = origin.toString(16);
+
+            return "0x" + ("00000000").substring(0, 8 - hex.length()) + hex;
+        }
+
+        public String prettyLength() {
+            if (length == null) {
+                return "";
+            }
+
+            if (length.compareTo(MEGA) >= 0 && length.mod(MEGA).equals(BigInteger.ZERO)) {
+                return length.divide(MEGA) + "M";
+            }
+
+            if (length.compareTo(KILO) >= 0 && length.mod(KILO).equals(BigInteger.ZERO)) {
+                return length.divide(KILO) + "k";
+            }
+
+            return String.valueOf(length);
+        }
+
+        public String prettyAttributes() {
+            String s = "";
+            for (MemoryAttribute attribute : attributes) {
+                s += attribute.name().toLowerCase();
+            }
+            return s;
+        }
+    }
+
+    public static LdLoader load(File path) throws Exception {
+        GnuLdLexer lexer = new GnuLdLexer(new ANTLRFileStream(path.getAbsolutePath()));
+        BufferedTokenStream tokens = new BufferedTokenStream(lexer);
+        GnuLdParser parser = new GnuLdParser(tokens);
+        parser.setBuildParseTree(true);
+        parser.removeErrorListeners();
+        ConsoleErrorListener errorListener = new ConsoleErrorListener();
+        parser.addErrorListener(errorListener);
+        CollectingErrorListener collectingErrorListener = new CollectingErrorListener();
+        parser.addErrorListener(collectingErrorListener);
+
+        ElfinfoGnuLdListener listener = new ElfinfoGnuLdListener();
+        parser.addParseListener(listener);
+
+        GnuLdParser.FileContext file = parser.file();
+
+        if (parser.getNumberOfSyntaxErrors() > 0) {
+            throw new ParseErrorException(lexer, tokens, parser, collectingErrorListener.errors
+            );
+        }
+
+//        ElfinfoGnuLdVisitor visitor = new ElfinfoGnuLdVisitor();
+//        visitor.visit(file);
+
+//        return new LdLoader(visitor.memoryAreas);
+        return new LdLoader(listener.memoryAreas);
+    }
+
+    public static class ParseErrorException extends Exception {
+        public final GnuLdLexer lexer;
+        public final BufferedTokenStream tokens;
+        public final GnuLdParser parser;
+        public final List<String> errors;
+
+        public ParseErrorException(GnuLdLexer lexer, BufferedTokenStream tokens, GnuLdParser parser, List<String> errors) {
+            this.lexer = lexer;
+            this.tokens = tokens;
+            this.parser = parser;
+            this.errors = errors;
+        }
+    }
+
+}
diff --git a/java/src/main/java/io/trygvis/ld/StringGnuLdVisitor.java b/java/src/main/java/io/trygvis/ld/StringGnuLdVisitor.java
new file mode 100644
index 0000000..a975497
--- /dev/null
+++ b/java/src/main/java/io/trygvis/ld/StringGnuLdVisitor.java
@@ -0,0 +1,59 @@
+package io.trygvis.ld;
+
+import io.trygvis.ld.antlr.GnuLdParserBaseVisitor;
+import io.trygvis.ld.antlr.GnuLdParser;
+import org.antlr.v4.runtime.tree.ParseTree;
+
+import java.util.List;
+
+class StringGnuLdVisitor extends GnuLdParserBaseVisitor<String> {
+
+//    public static String parseName(GnuLdParser.NameContext ctx) {
+//        return "";
+//    }
+
+    /*
+    public static String parseName(GnuLdParser.NameContext ctx) {
+        StringGnuLdVisitor v = new StringGnuLdVisitor();
+        return v.visit(ctx);
+    }
+
+    private StringBuilder string = new StringBuilder();
+
+    @Override
+    public String visitNamePlain(GnuLdParser.NamePlainContext ctx) {
+        System.out.println("NameTest.visitNamePlain");
+        String s = ctx.NAME().getText();
+        string.append(s);
+        return s;
+    }
+
+//    @Override
+//    public String visitName_or_space(GnuLdParser.Name_or_spaceContext ctx) {
+//        System.out.println("StringGnuLdBaseVisitor.visitName_or_space");
+//
+//        TerminalNode name = ctx.NAME();
+//        String s = name != null ? name.getText() : " ";
+//        string.append(s);
+//        return s;
+//    }
+
+    @Override
+    public String visitNameQuoted(GnuLdParser.NameQuotedContext ctx) {
+        System.out.println("StringGnuLdBaseVisitor.visitNameQuoted");
+        List<ParseTree> children = ctx.children;
+        System.out.println("children.size()) = " + children.size());
+
+        String s = "";
+        for (int i = 1; i < children.size() - 1; i++) {
+            ParseTree part = children.get(i);
+            System.out.println("part.getText() = " + part.getText());
+            s += part.getText();
+        }
+
+        return s;
+//
+//        return visitChildren(ctx);
+    }
+    */
+}