diff options
Diffstat (limited to 'vendor/github.com/tetratelabs/wazero/internal/wasm/memory.go')
| -rw-r--r-- | vendor/github.com/tetratelabs/wazero/internal/wasm/memory.go | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/vendor/github.com/tetratelabs/wazero/internal/wasm/memory.go b/vendor/github.com/tetratelabs/wazero/internal/wasm/memory.go index 947b16112..8e072fd12 100644 --- a/vendor/github.com/tetratelabs/wazero/internal/wasm/memory.go +++ b/vendor/github.com/tetratelabs/wazero/internal/wasm/memory.go @@ -52,7 +52,8 @@ type MemoryInstance struct { definition api.MemoryDefinition // Mux is used in interpreter mode to prevent overlapping calls to atomic instructions, - // introduced with WebAssembly threads proposal. + // introduced with WebAssembly threads proposal, and in compiler mode to make memory modifications + // within Grow non-racy for the Go race detector. Mux sync.Mutex // waiters implements atomic wait and notify. It is implemented similarly to golang.org/x/sync/semaphore, @@ -227,6 +228,11 @@ func MemoryPagesToBytesNum(pages uint32) (bytesNum uint64) { // Grow implements the same method as documented on api.Memory. func (m *MemoryInstance) Grow(delta uint32) (result uint32, ok bool) { + if m.Shared { + m.Mux.Lock() + defer m.Mux.Unlock() + } + currentPages := m.Pages() if delta == 0 { return currentPages, true @@ -299,6 +305,7 @@ func PagesToUnitOfBytes(pages uint32) string { // Uses atomic write to update the length of a slice. func atomicStoreLengthAndCap(slice *[]byte, length uintptr, cap uintptr) { + //nolint:staticcheck slicePtr := (*reflect.SliceHeader)(unsafe.Pointer(slice)) capPtr := (*uintptr)(unsafe.Pointer(&slicePtr.Cap)) atomic.StoreUintptr(capPtr, cap) @@ -308,6 +315,7 @@ func atomicStoreLengthAndCap(slice *[]byte, length uintptr, cap uintptr) { // Uses atomic write to update the length of a slice. func atomicStoreLength(slice *[]byte, length uintptr) { + //nolint:staticcheck slicePtr := (*reflect.SliceHeader)(unsafe.Pointer(slice)) lenPtr := (*uintptr)(unsafe.Pointer(&slicePtr.Len)) atomic.StoreUintptr(lenPtr, length) |