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Rewrite linear memory handling in terms of simple mmap/VirtualAlloc.

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The memmap crate doesn't make it straightforward to have part of the
region be writeable and part readonly. Since this is a fairly boutique
use case, and we don't need all that much code, just use the low-level
APIs directly.

Also, introduce a concept of "tunables" for adjusting the parameters of
the runtime.
This commit is contained in:
Dan Gohman
2018-11-29 10:11:11 -08:00
parent 1b98efd979
commit f44fe25f9c
13 changed files with 359 additions and 111 deletions
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6
lib/environ/Cargo.toml
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@@ -10,9 +10,9 @@ license = "Apache-2.0 WITH LLVM-exception"
readme = "README.md"
[dependencies]
cranelift-codegen = "0.25.0"
cranelift-entity = "0.25.0"
cranelift-wasm = "0.25.0"
cranelift-codegen = { git = "https://github.com/sunfishcode/cranelift.git", branch = "guard-offset" }
cranelift-entity = { git = "https://github.com/sunfishcode/cranelift.git", branch = "guard-offset" }
cranelift-wasm = { git = "https://github.com/sunfishcode/cranelift.git", branch = "guard-offset" }
memoffset = "0.2.1"
[features]