diff options
Diffstat (limited to 'src/runtime/malloc.go')
| -rw-r--r-- | src/runtime/malloc.go | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/runtime/malloc.go b/src/runtime/malloc.go index 854609220d..1f82dbd124 100644 --- a/src/runtime/malloc.go +++ b/src/runtime/malloc.go @@ -206,8 +206,16 @@ const ( // mips32 only has access to the low 2GB of virtual memory, so // we further limit it to 31 bits. // + // On darwin/arm64, although 64-bit pointers are presumably + // available, pointers are truncated to 33 bits. Furthermore, + // only the top 4 GiB of the address space are actually available + // to the application, but we allow the whole 33 bits anyway for + // simplicity. + // TODO(mknyszek): Consider limiting it to 32 bits and using + // arenaBaseOffset to offset into the top 4 GiB. + // // WebAssembly currently has a limit of 4GB linear memory. - heapAddrBits = (_64bit*(1-sys.GoarchWasm)*(1-sys.GoosAix))*48 + (1-_64bit+sys.GoarchWasm)*(32-(sys.GoarchMips+sys.GoarchMipsle)) + 60*sys.GoosAix + heapAddrBits = (_64bit*(1-sys.GoarchWasm)*(1-sys.GoosAix)*(1-sys.GoosDarwin*sys.GoarchArm64))*48 + (1-_64bit+sys.GoarchWasm)*(32-(sys.GoarchMips+sys.GoarchMipsle)) + 60*sys.GoosAix + 33*sys.GoosDarwin*sys.GoarchArm64 // maxAlloc is the maximum size of an allocation. On 64-bit, // it's theoretically possible to allocate 1<<heapAddrBits bytes. On |