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| author | Dan Gohman <sunfish@mozilla.com> | 2015-06-10 09:48:07 -0700 |
|---|---|---|
| committer | Dan Gohman <sunfish@mozilla.com> | 2015-06-10 09:48:07 -0700 |
| commit | 2c740481c4862fc58b9e99e16652c2e1dccbf786 (patch) | |
| tree | 9aca4b4f9b95548d572a4957067d150e1b903f53 | |
| parent | 6525f08e1c9a3a7905b60d83616c3e0e80dabe30 (diff) | |
| download | nanowasm-design-2c740481c4862fc58b9e99e16652c2e1dccbf786.tar.gz | |
Clarify that implementations don't actually need to make 4 GiB of memory available.
And that >4GiB heaps will be a feature-tested feature.
| -rw-r--r-- | Portability.md | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/Portability.md b/Portability.md index 9b4387b..7a116f3 100644 --- a/Portability.md +++ b/Portability.md @@ -24,9 +24,12 @@ characteristics: * Support unaligned memory accesses or reliable trapping that allows software emulation thereof. * Little-endian byte ordering. -* Up to 4GiB of addressable memory in a 32-bit address space. Heaps bigger than - 4GiB in a 64-bit address space - [may be added later](FutureFeatures.md#Heaps-bigger-than-4GiB). +* Memory regions which can be efficiently addressed with 32-bit + pointers or indices. +* Heaps bigger than 4GiB with 64-bit addressing + [may be added later](FutureFeatures.md#Heaps-bigger-than-4GiB), though it will + be done under a [feature test](FeatureTest.md) so it won't be required for all + WebAssembly implementations. * Enforce secure isolation between WebAssembly modules and other modules or processes executing on the same machine. * An execution environment which offers forward progress guarantees to all |