all: store data layout as little endian value

This makes it much easier to read the value at runtime, as pointer
indices are naturally little endian. It should not affect anything else
in the program.

1 files changed, 10 insertions, 0 deletions

diff --git a/compiler/llvm.go b/compiler/llvm.go
index 8b80869bf..86c843199 100644
--- a/compiler/llvm.go
+++ b/compiler/llvm.go
@@ -166,6 +166,7 @@ func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Va
 	// Create the global initializer.
 	bitmapBytes := make([]byte, int(objectSizeWords+7)/8)
 	bitmap.FillBytes(bitmapBytes)
+	reverseBytes(bitmapBytes) // big-endian to little-endian
 	var bitmapByteValues []llvm.Value
 	for _, b := range bitmapBytes {
 		bitmapByteValues = append(bitmapByteValues, llvm.ConstInt(c.ctx.Int8Type(), uint64(b), false))
@@ -314,3 +315,12 @@ func (b *builder) readStackPointer() llvm.Value {
 	}
 	return b.CreateCall(stacksave.GlobalValueType(), stacksave, nil, "")
 }
+
+// Reverse a slice of bytes. From the wiki:
+// https://github.com/golang/go/wiki/SliceTricks#reversing
+func reverseBytes(buf []byte) {
+	for i := len(buf)/2 - 1; i >= 0; i-- {
+		opp := len(buf) - 1 - i
+		buf[i], buf[opp] = buf[opp], buf[i]
+	}
+}