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Implement emitting Windows unwind information for fastcall functions. (#1155)

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* Implement emitting Windows unwind information for fastcall functions.

This commit implements emitting Windows unwind information for x64 fastcall
calling convention functions.

The unwind information can be used to construct a Windows function table at
runtime for JIT'd code, enabling stack walking and unwinding by the operating
system.

* Address code review feedback.

This commit addresses code review feedback:

* Remove unnecessary unsafe code.
* Emit the unwind information always as little endian.
* Fix comments.

A dependency from cranelift-codegen to the byteorder crate was added.
The byteorder crate is a no-dependencies crate with a reasonable
abstraction for writing binary data for a specific endianness.

* Address code review feedback.

* Disable default features for the `byteorder` crate.
* Add a comment regarding the Windows ABI unwind code numerical values.
* Panic if we encounter a Windows function with a prologue greater than 256
  bytes in size.
This commit is contained in:
Peter Huene
2019-11-05 13:14:30 -08:00
committed by Dan Gohman
parent 2eea366530
commit 8923bac7e8
11 changed files with 979 additions and 4 deletions
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cranelift/filetests/Cargo.toml
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@@ -20,6 +20,7 @@ log = "0.4.6"
memmap = "0.7.0"
num_cpus = "1.8.0"
region = "2.1.2"
byteorder = { version = "1.3.2", default-features = false }
[features]
basic-blocks = []