Fix entry alignment issue with AssemblyScript maps

CHANGELOG.md

@@ -35,6 +35,7 @@ In previous releases, the name "Hypermode" was used for all three._
 - Improve `.env` file handling [#458](https://github.com/hypermodeinc/modus/pull/458)
 - Update command-line args and env variables [#459](https://github.com/hypermodeinc/modus/pull/459)
 - Update Sentry telemetry collection rules [#460](https://github.com/hypermodeinc/modus/pull/460)
+- Fix entry alignment issue with AssemblyScript maps [#461](https://github.com/hypermodeinc/modus/pull/461)
 
 ## 2024-10-02 - Version 0.12.7
 

runtime/languages/assemblyscript/handler_maps.go

@@ -132,6 +132,7 @@ func (h *mapHandler) Read(ctx context.Context, wa langsupport.WasmAdapter, offse
 	entrySize := byteLength / entriesCapacity
 	keySize := h.keyHandler.TypeInfo().Size()
 	valueOffset := max(keySize, 4)
+	valueAlign := h.valueHandler.TypeInfo().Alignment()
 
 	if !h.usePseudoMap {
 		// return a map
@@ -144,7 +145,8 @@ func (h *mapHandler) Read(ctx context.Context, wa langsupport.WasmAdapter, offse
 				return nil, err
 			}
 
-			v, err := h.valueHandler.Read(ctx, wa, p+valueOffset)
+			p += langsupport.AlignOffset(valueOffset, valueAlign)
+			v, err := h.valueHandler.Read(ctx, wa, p)
 			if err != nil {
 				return nil, err
 			}
@@ -164,7 +166,8 @@ func (h *mapHandler) Read(ctx context.Context, wa langsupport.WasmAdapter, offse
 				return nil, err
 			}
 
-			v, err := h.valueHandler.Read(ctx, wa, p+keySize)
+			p += langsupport.AlignOffset(valueOffset, valueAlign)
+			v, err := h.valueHandler.Read(ctx, wa, p)
 			if err != nil {
 				return nil, err
 			}
@@ -211,13 +214,14 @@ func (h *mapHandler) Write(ctx context.Context, wa langsupport.WasmAdapter, offs
 	// note: unlike arrays, an empty map DOES have array buffers
 	keySize := h.keyHandler.TypeInfo().Size()
 	valueSize := h.valueHandler.TypeInfo().Size()
-	valueOffset := max(keySize, 4)
+	valueAlign := h.valueHandler.TypeInfo().Alignment()
+	valueOffset := langsupport.AlignOffset(max(keySize, 4), valueAlign)
 
 	const taggedNextSize = 4
-	taggedNextOffset := valueSize + valueOffset
+	taggedNextOffset := valueOffset + langsupport.AlignOffset(valueSize, valueAlign)
 
-	entryAlign := max(keySize, valueSize, 4) - 1
-	entrySize := (keySize + valueSize + taggedNextSize + entryAlign) & ^entryAlign
+	entryAlign := max(keySize, valueSize, taggedNextSize)
+	entrySize := langsupport.AlignOffset(taggedNextOffset+taggedNextSize, entryAlign)
 	entriesBufferSize := entrySize * entriesCapacity
 	entriesBufferOffset, c, err := wa.AllocateMemory(ctx, entriesBufferSize)
 	cln.AddCleaner(c)
@@ -259,7 +263,7 @@ func (h *mapHandler) Write(ctx context.Context, wa langsupport.WasmAdapter, offs
 
 		// write entry value
 		value := vals[i]
-		entryValueOffset := entryOffset + valueOffset
+		entryValueOffset := entryOffset + langsupport.AlignOffset(valueOffset, valueAlign)
 		c, err := h.valueHandler.Write(ctx, wa, entryValueOffset, value)
 		cln.AddCleaner(c)
 		if err != nil {

runtime/languages/assemblyscript/testdata/assembly/maps.ts

@@ -138,3 +138,32 @@ export function testClassContainingMapOutput_string_string(): TestClassWithMap {
   c.m.set("c", "3");
   return c;
 }
+
+export function testMapInput_string_f64(m: Map<string, f64>): void {
+  assert(m.size == 4, "expected size 4");
+
+  let n: f64 = 0.5;
+  assert(m.has("a"), "expected key 'a' to be present");
+  assert(m.get("a") == n, `expected value for key 'a' to be ${n}`);
+
+  n = f64.EPSILON;
+  assert(m.has("b"), "expected key 'b' to be present");
+  assert(m.get("b") == n, `expected value for key 'b' to be ${n}`);
+
+  n = f64.MIN_VALUE;
+  assert(m.has("c"), "expected key 'c' to be present");
+  assert(m.get("c") == n, `expected value for key 'c' to be ${n}`);
+
+  n = f64.MAX_VALUE;
+  assert(m.has("d"), "expected key 'd' to be present");
+  assert(m.get("d") == n, `expected value for key 'd' to be ${n}`);
+}
+
+export function testMapOutput_string_f64(): Map<string, f64> {
+  const m = new Map<string, f64>();
+  m.set("a", 0.5);
+  m.set("b", f64.EPSILON);
+  m.set("c", f64.MIN_VALUE);
+  m.set("d", f64.MAX_VALUE);
+  return m;
+}

runtime/languages/assemblyscript/tests/maps_test.go

@@ -12,6 +12,7 @@ package assemblyscript_test
 import (
 	"fmt"
 	"maps"
+	"math"
 	"reflect"
 	"testing"
 
@@ -232,3 +233,47 @@ func makeTestMap(size int) map[string]string {
 	}
 	return m
 }
+
+var epsilon = math.Nextafter(1, 2) - 1
+
+func TestMapInput_string_f64(t *testing.T) {
+	fnName := "testMapInput_string_f64"
+	m := map[string]float64{
+		"a": 0.5,
+		"b": epsilon,
+		"c": math.SmallestNonzeroFloat64,
+		"d": math.MaxFloat64,
+	}
+
+	if _, err := fixture.CallFunction(t, fnName, m); err != nil {
+		t.Error(err)
+	}
+	if m, err := utils.ConvertToMap(m); err != nil {
+		t.Error(fmt.Errorf("failed conversion to interface map: %w", err))
+	} else if _, err := fixture.CallFunction(t, fnName, m); err != nil {
+		t.Error(err)
+	}
+}
+
+func TestMapOutput_string_f64(t *testing.T) {
+	fnName := "testMapOutput_string_f64"
+	result, err := fixture.CallFunction(t, fnName)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expected := map[string]float64{
+		"a": 0.5,
+		"b": epsilon,
+		"c": math.SmallestNonzeroFloat64,
+		"d": math.MaxFloat64,
+	}
+
+	if result == nil {
+		t.Error("expected a result")
+	} else if r, ok := result.(map[string]float64); !ok {
+		t.Errorf("expected %T, got %T", expected, result)
+	} else if !maps.Equal(expected, r) {
+		t.Errorf("expected %v, got %v", expected, r)
+	}
+}