compiler,runtime: allow map values >256 bytes

Author: dgryski

compiler/map.go

@@ -42,7 +42,7 @@ func (b *builder) createMakeMap(expr *ssa.MakeMap) (llvm.Value, error) {
 	keySize := b.targetData.TypeAllocSize(llvmKeyType)
 	valueSize := b.targetData.TypeAllocSize(llvmValueType)
 	llvmKeySize := llvm.ConstInt(b.ctx.Int8Type(), keySize, false)
-	llvmValueSize := llvm.ConstInt(b.ctx.Int8Type(), valueSize, false)
+	llvmValueSize := llvm.ConstInt(b.ctx.Int32Type(), valueSize, false)
 	sizeHint := llvm.ConstInt(b.uintptrType, 8, false)
 	algEnum := llvm.ConstInt(b.ctx.Int8Type(), alg, false)
 	if expr.Reserve != nil {

src/runtime/hashmap.go

@@ -15,8 +15,8 @@ type hashmap struct {
 	buckets    unsafe.Pointer // pointer to array of buckets
 	seed       uintptr
 	count      uintptr
+	valueSize  uint32
 	keySize    uint8 // maybe this can store the key type as well? E.g. keysize == 5 means string?
-	valueSize  uint8
 	bucketBits uint8
 	keyEqual   func(x, y unsafe.Pointer, n uintptr) bool
 	keyHash    func(key unsafe.Pointer, size, seed uintptr) uint32
@@ -60,7 +60,7 @@ func hashmapTopHash(hash uint32) uint8 {
 }
 
 // Create a new hashmap with the given keySize and valueSize.
-func hashmapMake(keySize, valueSize uint8, sizeHint uintptr, alg uint8) *hashmap {
+func hashmapMake(keySize uint8, valueSize uint32, sizeHint uintptr, alg uint8) *hashmap {
 	numBuckets := sizeHint / 8
 	bucketBits := uint8(0)
 	for numBuckets != 0 {