Fix number of pages

1 files changed, 4 insertions, 2 deletions

diff --git a/src/main/java/org/shedlang/compiler/backends/wasm/WasmMemoryBuilder.java b/src/main/java/org/shedlang/compiler/backends/wasm/WasmMemoryBuilder.java
index 947fbeec..6b69874e 100644
--- a/src/main/java/org/shedlang/compiler/backends/wasm/WasmMemoryBuilder.java
+++ b/src/main/java/org/shedlang/compiler/backends/wasm/WasmMemoryBuilder.java
@@ -16,6 +16,7 @@ import java.util.List;
 public class WasmMemoryBuilder {
     public static final WasmMemoryBuilder EMPTY = new WasmMemoryBuilder(OrderedPMap.empty(), 0);
 
+    private static final int PAGE_SIZE = 65536;
     private static final WasmDataSegmentIndex DATA_SEGMENT_INDEX = new WasmDataSegmentIndex(0);
 
     private final OrderedPMap<String, Entity> entities;
@@ -27,12 +28,13 @@ public class WasmMemoryBuilder {
     }
 
     public WasmModule toModule(WasmModule module) {
+        var pageCount = (size + PAGE_SIZE - 1) / PAGE_SIZE;
+
         module = module
             .addImport(new WasmImport(
                 "env",
                 "__linear_memory",
-                // TODO: turn size into number of pages
-                new WasmImportDescriptor.Memory(new WasmMemoryType(WasmLimits.min(size)))
+                new WasmImportDescriptor.Memory(new WasmMemoryType(WasmLimits.min(pageCount)))
             ));
 
         if (entities.size() > 0) {