add windows exception handling in C (#175)

.appveyor.yml

@@ -29,4 +29,5 @@ build_script:
 
 test_script:
   - set RUST_BACKTRACE=1
-  - cargo test --verbose
+  - cd ./lib/spectests && cargo test -- --test-threads 1 && cd ../..
+

Cargo.lock

@@ -1,3 +1,13 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "aho-corasick"
+version = "0.6.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "ansi_term"
 version = "0.11.0"
@@ -21,6 +31,49 @@ name = "autocfg"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "backtrace"
+version = "0.3.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace-sys 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "backtrace-sys"
+version = "0.1.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "bindgen"
+version = "0.46.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cexpr 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clang-sys 0.26.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "env_logger 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hashbrown 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "peeking_take_while 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "which 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "bitflags"
 version = "1.0.4"
@@ -65,11 +118,29 @@ name = "cc"
 version = "1.0.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "cexpr"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "nom 4.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "cfg-if"
 version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "clang-sys"
+version = "0.26.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libloading 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "clap"
 version = "2.32.0"
@@ -178,6 +249,18 @@ dependencies = [
  "generic-array 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "env_logger"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "humantime 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "errno"
 version = "0.2.4"
@@ -202,6 +285,7 @@ name = "failure"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
+ "backtrace 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -276,6 +360,14 @@ dependencies = [
  "unicode-segmentation 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "humantime"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "indexmap"
 version = "1.0.2"
@@ -310,6 +402,15 @@ name = "libc"
 version = "0.2.48"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "libloading"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "lock_api"
 version = "0.1.5"
@@ -327,6 +428,11 @@ dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "memchr"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "memmap"
 version = "0.7.0"
@@ -360,6 +466,15 @@ dependencies = [
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "nom"
+version = "4.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "opaque-debug"
 version = "0.2.2"
@@ -404,6 +519,19 @@ dependencies = [
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "peeking_take_while"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "proc-macro2"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "0.4.26"
@@ -412,6 +540,19 @@ dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "quick-error"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "quote"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "quote"
 version = "0.6.11"
@@ -547,6 +688,31 @@ dependencies = [
  "redox_syscall 0.1.51 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "regex"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "aho-corasick 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rustc-demangle"
+version = "0.1.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "rustc_version"
 version = "0.2.3"
@@ -602,12 +768,12 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.85"
+version = "1.0.58"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.13.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -669,6 +835,16 @@ dependencies = [
  "syn 0.15.26 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "syn"
+version = "0.13.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "syn"
 version = "0.15.26"
@@ -700,6 +876,14 @@ dependencies = [
  "serde_json 1.0.37 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "termcolor"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "wincolor 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "termion"
 version = "1.5.1"
@@ -718,6 +902,14 @@ dependencies = [
  "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "thread_local"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "time"
 version = "0.1.42"
@@ -733,6 +925,11 @@ name = "typenum"
 version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "ucd-util"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "unicode-segmentation"
 version = "1.2.1"
@@ -756,11 +953,21 @@ dependencies = [
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "utf8-ranges"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "vec_map"
 version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "version_check"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "void"
 version = "1.0.2"
@@ -772,7 +979,7 @@ version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "serde 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.58 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.37 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -815,10 +1022,12 @@ dependencies = [
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- "serde_derive 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.58 (registry+https://github.com/rust-lang/crates.io-index)",
  "target-lexicon 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmer-runtime-core 0.1.2",
+ "wasmer-win-exception-handler 0.0.1",
  "wasmparser 0.23.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -860,7 +1069,7 @@ dependencies = [
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- "serde_derive 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -876,6 +1085,18 @@ dependencies = [
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 ]
 
+[[package]]
+name = "wasmer-win-exception-handler"
+version = "0.0.1"
+dependencies = [
+ "bindgen 0.46.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cmake 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasmer-runtime-core 0.1.2",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "wasmparser"
 version = "0.22.1"
@@ -886,6 +1107,15 @@ name = "wasmparser"
 version = "0.23.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "which"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "winapi"
 version = "0.2.8"
@@ -910,15 +1140,36 @@ name = "winapi-i686-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "winapi-util"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -991,7 +1256,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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+"checksum serde_derive 1.0.58 (registry+https://github.com/rust-lang/crates.io-index)" = "ac38f51a52a556cd17545798e29536885fb1a3fa63d6399f5ef650f4a7d35901"
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@@ -999,25 +1264,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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Cargo.toml

@@ -27,7 +27,7 @@ wasmer-runtime-core = { path = "lib/runtime-core" }
 wasmer-emscripten = { path = "lib/emscripten" }
 
 [workspace]
-members = ["lib/clif-backend", "lib/runtime", "lib/runtime-core", "lib/emscripten", "lib/spectests"]
+members = ["lib/clif-backend", "lib/runtime", "lib/runtime-core", "lib/emscripten", "lib/spectests", "lib/win-exception-handler"]
 
 [build-dependencies]
 wabt = "0.7.2"

README.md

@@ -47,10 +47,10 @@ Wasmer is structured into different directories:
 
 Building wasmer requires [rustup](https://rustup.rs/).
 
-To install on Windows, download and run [`rustup-init.exe`](https://win.rustup.rs/)
+To build on Windows, download and run [`rustup-init.exe`](https://win.rustup.rs/)
 then follow the onscreen instructions.
 
-To install on other systems, run:
+To build on other systems, run:
 
 ```sh
 curl https://sh.rustup.rs -sSf | sh
@@ -86,8 +86,8 @@ sudo apt install cmake
 
 #### Windows (MSVC)
 
-Right now Windows support is _highly experimental_.
+Windows support is _highly experimental_. Only simple wasm programs may be run, and no syscalls are allowed. This means
-We are working on this so Wasmer can soon be released for Windows.
+nginx and lua do not work on Windows. See [this issue for ongoing Emscripten syscall polyfills for Windows](https://github.com/wasmerio/wasmer/pull/176).
 
 1. Install Python for Windows (https://www.python.org/downloads/release/python-2714/). The Windows x86-64 MSI installer is fine.
    You should change the installation to install the "Add python.exe to Path" feature.
@@ -95,6 +95,8 @@ We are working on this so Wasmer can soon be released for Windows.
 2. Install Git for Windows (https://git-scm.com/download/win). DO allow it to add git.exe to the PATH (default
    settings for the installer are fine).
 
+3. Install CMake (https://cmake.org/download/). Ensure CMake is in the PATH.
+
 ## Building
 
 Wasmer is built with [Cargo](https://crates.io/), the Rust package manager.

lib/clif-backend/Cargo.toml

@@ -37,6 +37,10 @@ optional = true
 version = "0.0.7"
 optional = true
 
+[target.'cfg(windows)'.dependencies]
+winapi = { version = "0.3", features = ["errhandlingapi", "minwindef", "minwinbase", "winnt"] }
+wasmer-win-exception-handler = { path = "../win-exception-handler", version = "0.0.1" }
+
 [features]
 cache = ["serde", "serde_derive", "serde_bytes", "serde-bench", "wasmer-runtime-core/cache"]
 debug = ["wasmer-runtime-core/debug"]

lib/clif-backend/src/resolver.rs

@@ -223,9 +223,9 @@ impl FuncResolverBuilder {
                         LibCall::TruncF64 => libcalls::truncf64 as isize,
                         LibCall::NearestF64 => libcalls::nearbyintf64 as isize,
                         #[cfg(all(target_pointer_width = "64", target_os = "windows"))]
-                        Probestack => __chkstk as isize,
+                        LibCall::Probestack => __chkstk as isize,
                         #[cfg(not(target_os = "windows"))]
-                        Probestack => __rust_probestack as isize,
+                        LibCall::Probestack => __rust_probestack as isize,
                     },
                     RelocationType::Intrinsic(ref name) => match name.as_str() {
                         "i32print" => i32_print as isize,

lib/clif-backend/src/signal/mod.rs

@@ -110,6 +110,7 @@ impl ProtectedCaller for Caller {
             .lookup(sig_index)
             .expect("that trampoline doesn't exist");
 
+        #[cfg(not(target_os = "windows"))]
         call_protected(&self.handler_data, || unsafe {
             // Leap of faith.
             trampoline(
@@ -120,6 +121,17 @@ impl ProtectedCaller for Caller {
             );
         })?;
 
+        // the trampoline is called from C on windows
+        #[cfg(target_os = "windows")]
+        call_protected(
+            &self.handler_data,
+            trampoline,
+            vmctx_ptr,
+            func_ptr,
+            param_vec.as_ptr(),
+            return_vec.as_mut_ptr(),
+        )?;
+
         Ok(return_vec
             .iter()
             .zip(signature.returns().iter())

lib/clif-backend/src/signal/windows.rs

@@ -1,10 +1,116 @@
+use crate::relocation::{TrapCode, TrapData};
 use crate::signal::HandlerData;
-use wasmer_runtime_core::error::RuntimeResult;
+use crate::trampoline::Trampoline;
+use std::cell::Cell;
+use std::ffi::c_void;
+use std::ptr;
+use wasmer_runtime_core::vm::Ctx;
+use wasmer_runtime_core::vm::Func;
+use wasmer_runtime_core::{
+    error::{RuntimeError, RuntimeResult},
+    structures::TypedIndex,
+    types::{MemoryIndex, TableIndex},
+};
+use wasmer_win_exception_handler::CallProtectedData;
+pub use wasmer_win_exception_handler::_call_protected;
+use winapi::shared::minwindef::DWORD;
+use winapi::um::minwinbase::{
+    EXCEPTION_ACCESS_VIOLATION, EXCEPTION_FLT_DENORMAL_OPERAND, EXCEPTION_FLT_DIVIDE_BY_ZERO,
+    EXCEPTION_FLT_INEXACT_RESULT, EXCEPTION_FLT_INVALID_OPERATION, EXCEPTION_FLT_OVERFLOW,
+    EXCEPTION_FLT_STACK_CHECK, EXCEPTION_FLT_UNDERFLOW, EXCEPTION_ILLEGAL_INSTRUCTION,
+    EXCEPTION_INT_DIVIDE_BY_ZERO, EXCEPTION_INT_OVERFLOW, EXCEPTION_STACK_OVERFLOW,
+};
 
-pub fn call_protected<T>(handler_data: &HandlerData, f: impl FnOnce() -> T) -> RuntimeResult<T> {
+thread_local! {
-    unimplemented!("TODO");
+    pub static CURRENT_EXECUTABLE_BUFFER: Cell<*const c_void> = Cell::new(ptr::null());
+}
+
+pub fn call_protected(
+    handler_data: &HandlerData,
+    trampoline: Trampoline,
+    ctx: *mut Ctx,
+    func: *const Func,
+    param_vec: *const u64,
+    return_vec: *mut u64,
+) -> RuntimeResult<()> {
+    // TODO: trap early
+    // user code error
+    //    if let Some(msg) = super::TRAP_EARLY_DATA.with(|cell| cell.replace(None)) {
+    //        return Err(RuntimeError::User { msg });
+    //    }
+
+    let result = _call_protected(trampoline, ctx, func, param_vec, return_vec);
+
+    if let Ok(_) = result {
+        return Ok(());
+    }
+
+    let CallProtectedData {
+        code: signum,
+        exceptionAddress: exception_address,
+        instructionPointer: instruction_pointer,
+    } = result.unwrap_err();
+
+    if let Some(TrapData {
+        trapcode,
+        srcloc: _,
+    }) = handler_data.lookup(instruction_pointer as _)
+    {
+        Err(match signum as DWORD {
+            EXCEPTION_ACCESS_VIOLATION => RuntimeError::OutOfBoundsAccess {
+                memory: MemoryIndex::new(0),
+                addr: None,
+            },
+            EXCEPTION_ILLEGAL_INSTRUCTION => match trapcode {
+                TrapCode::BadSignature => RuntimeError::IndirectCallSignature {
+                    table: TableIndex::new(0),
+                },
+                TrapCode::IndirectCallToNull => RuntimeError::IndirectCallToNull {
+                    table: TableIndex::new(0),
+                },
+                TrapCode::HeapOutOfBounds => RuntimeError::OutOfBoundsAccess {
+                    memory: MemoryIndex::new(0),
+                    addr: None,
+                },
+                TrapCode::TableOutOfBounds => RuntimeError::TableOutOfBounds {
+                    table: TableIndex::new(0),
+                },
+                _ => RuntimeError::Unknown {
+                    msg: "unknown trap".to_string(),
+                },
+            },
+            EXCEPTION_STACK_OVERFLOW => RuntimeError::Unknown {
+                msg: "unknown trap".to_string(),
+            },
+            EXCEPTION_INT_DIVIDE_BY_ZERO => RuntimeError::IllegalArithmeticOperation,
+            EXCEPTION_INT_OVERFLOW => RuntimeError::IllegalArithmeticOperation,
+            _ => RuntimeError::Unknown {
+                msg: "unknown trap".to_string(),
+            },
+        }
+        .into())
+    } else {
+        let signal = match signum as DWORD {
+            EXCEPTION_FLT_DENORMAL_OPERAND
+            | EXCEPTION_FLT_DIVIDE_BY_ZERO
+            | EXCEPTION_FLT_INEXACT_RESULT
+            | EXCEPTION_FLT_INVALID_OPERATION
+            | EXCEPTION_FLT_OVERFLOW
+            | EXCEPTION_FLT_STACK_CHECK
+            | EXCEPTION_FLT_UNDERFLOW => "floating-point exception",
+            EXCEPTION_ILLEGAL_INSTRUCTION => "illegal instruction",
+            EXCEPTION_ACCESS_VIOLATION => "segmentation violation",
+            _ => "unkown trapped signal",
+        };
+
+        Err(RuntimeError::Unknown {
+            msg: format!("trap at {} - {}", exception_address, signal),
+        }
+        .into())
+    }
 }
 
 pub unsafe fn trigger_trap() -> ! {
-    unimplemented!("TODO");
+    // TODO
+    unimplemented!();
 }

lib/clif-backend/src/trampoline.rs

@@ -7,6 +7,7 @@ use cranelift_codegen::{
     isa, Context,
 };
 use hashbrown::HashMap;
+use std::ffi::c_void;
 use std::{iter, mem};
 use wasmer_runtime_core::{
     backend::sys::{Memory, Protect},
@@ -23,6 +24,9 @@ impl RelocSink for NullRelocSink {
     fn reloc_jt(&mut self, _: u32, _: Reloc, _: ir::JumpTable) {}
 }
 
+pub type Trampoline =
+    unsafe extern "C" fn(*mut vm::Ctx, *const vm::Func, *const u64, *mut u64) -> c_void;
+
 pub struct Trampolines {
     memory: Memory,
     offsets: HashMap<SigIndex, usize>,
@@ -138,10 +142,7 @@ impl Trampolines {
         }
     }
 
-    pub fn lookup(
+    pub fn lookup(&self, sig_index: SigIndex) -> Option<Trampoline> {
-        &self,
-        sig_index: SigIndex,
-    ) -> Option<unsafe extern "C" fn(*mut vm::Ctx, *const vm::Func, *const u64, *mut u64)> {
         let offset = *self.offsets.get(&sig_index)?;
         let ptr = unsafe { self.memory.as_ptr().add(offset) };
 
@@ -212,7 +213,9 @@ fn wasm_ty_to_clif(ty: Type) -> ir::types::Type {
 }
 
 fn generate_trampoline_signature() -> ir::Signature {
-    let mut sig = ir::Signature::new(isa::CallConv::SystemV);
+    let isa = super::get_isa();
+    let call_convention = isa.default_call_conv();
+    let mut sig = ir::Signature::new(call_convention);
 
     let ptr_param = ir::AbiParam {
         value_type: ir::types::I64,
@@ -227,7 +230,9 @@ fn generate_trampoline_signature() -> ir::Signature {
 }
 
 fn generate_export_signature(func_sig: &FuncSig) -> ir::Signature {
-    let mut export_clif_sig = ir::Signature::new(isa::CallConv::SystemV);
+    let isa = super::get_isa();
+    let call_convention = isa.default_call_conv();
+    let mut export_clif_sig = ir::Signature::new(call_convention);
 
     let func_sig_iter = func_sig.params().iter().map(|wasm_ty| ir::AbiParam {
         value_type: wasm_ty_to_clif(*wasm_ty),

lib/runtime-core/src/sys/windows/memory.rs

@@ -150,7 +150,8 @@ impl Drop for Memory {
     fn drop(&mut self) {
         if !self.ptr.is_null() {
             let success = unsafe { VirtualFree(self.ptr as _, self.size, MEM_DECOMMIT) };
-            assert_eq!(success, 0, "failed to unmap memory: {}", errno::errno());
+            // If the function succeeds, the return value is nonzero.
+            assert_eq!(success, 1, "failed to unmap memory: {}", errno::errno());
         }
     }
 }

lib/runtime-core/src/vm.rs

@@ -169,6 +169,7 @@ enum InnerFunc {}
 /// Used to provide type safety (ish) for passing around function pointers.
 /// The typesystem ensures this cannot be dereferenced since an
 /// empty enum cannot actually exist.
+#[repr(C)]
 pub struct Func(InnerFunc);
 
 /// An imported function, which contains the vmctx that owns this function.

lib/spectests/examples/simple/main.rs

@@ -1,8 +1,6 @@
-use std::fs::remove_file;
 use wabt::wat2wasm;
 use wasmer_clif_backend::CraneliftCompiler;
 use wasmer_runtime_core::{
-    cache::Cache,
     error,
     global::Global,
     memory::Memory,
@@ -15,7 +13,6 @@ use wasmer_runtime_core::{
 static EXAMPLE_WASM: &'static [u8] = include_bytes!("simple.wasm");
 
 fn main() -> error::Result<()> {
-    let compiler = CraneliftCompiler::new();
     let wasm_binary = wat2wasm(IMPORT_MODULE.as_bytes()).expect("WAST not valid or malformed");
 
     let inner_module = wasmer_runtime_core::compile_with(&wasm_binary, &CraneliftCompiler::new())?;

lib/win-exception-handler/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "wasmer-win-exception-handler"
+version = "0.0.1"
+description = "Wasmer runtime exception handling for Windows"
+license = "MIT"
+authors = ["The Wasmer Engineering Team <engineering@wasmer.io>"]
+repository = "https://github.com/wasmerio/wasmer"
+edition = "2018"
+
+[target.'cfg(windows)'.dependencies]
+wasmer-runtime-core = { path = "../runtime-core", version = "0.1.2" }
+winapi = { version = "0.3", features = ["winbase", "errhandlingapi", "minwindef", "minwinbase", "winnt"] }
+libc = "0.2.48"
+
+[build-dependencies]
+cmake = "0.1.35"
+bindgen = "0.46.0"
+regex = "1.0.6"

lib/win-exception-handler/build.rs

@@ -0,0 +1,11 @@
+use cmake::Config;
+
+fn main() {
+    #[cfg(target_os = "windows")]
+    {
+        let project_name = "exception_handling";
+        let dst = Config::new(project_name).build();
+        println!("cargo:rustc-link-search=native={}", dst.display());
+        println!("cargo:rustc-link-lib=static={}", project_name);
+    }
+}

lib/win-exception-handler/exception_handling/.gitignore

@@ -0,0 +1 @@
+cmake-build-*

lib/win-exception-handler/exception_handling/CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.0)
+project(exception_handling C)
+
+add_library(exception_handling STATIC exception_handling.c)
+
+install(TARGETS exception_handling DESTINATION .)

lib/win-exception-handler/exception_handling/exception_handling.c

@@ -0,0 +1,74 @@
+#include <windows.h>
+#include <setjmp.h>
+#include "exception_handling.h"
+
+#define CALL_FIRST 1
+
+__declspec(thread) jmp_buf jmpBuf;
+__declspec(thread) PVOID caughtExceptionAddress;
+__declspec(thread) DWORD64 caughtInstructionPointer;
+__declspec(thread) PVOID savedStackPointer;
+__declspec(thread) BOOL exceptionHandlerInstalled = FALSE;
+__declspec(thread) BOOL alreadyHandlingException = FALSE;
+
+void longjmpOutOfHere() {
+    longjmp(jmpBuf, 1);
+}
+
+/// Get the current address that we use to jmp, the no inline is important
+static __declspec(noinline) void *get_callee_frame_address(void) {
+    return _AddressOfReturnAddress();
+}
+
+static LONG WINAPI
+exceptionHandler(struct _EXCEPTION_POINTERS *ExceptionInfo) {
+    EXCEPTION_RECORD* pExceptionRecord = ExceptionInfo->ExceptionRecord;
+    PCONTEXT pCONTEXT = ExceptionInfo->ContextRecord;
+    caughtExceptionAddress = pExceptionRecord->ExceptionAddress;
+    caughtInstructionPointer = pCONTEXT->Rip;
+    if (alreadyHandlingException == TRUE) {
+        return EXCEPTION_CONTINUE_SEARCH;
+    }
+    alreadyHandlingException = TRUE;
+
+    // Basically, here, we coerce the os to resume us into a context that calls `longjmp` instead of just continuing.
+    // Presumably, we cannot `longjmp` out of the signal/exception context, like we can on unix.
+    pCONTEXT->Rip = (uintptr_t)(&longjmpOutOfHere);
+    pCONTEXT->Rsp = (uintptr_t)(savedStackPointer);
+    return EXCEPTION_CONTINUE_EXECUTION;
+}
+
+uint8_t callProtected(trampoline_t trampoline,
+        const struct wasmer_instance_context_t* ctx,
+        const struct func_t* func,
+        const uint64_t* param_vec,
+        uint64_t* return_vec,
+        struct call_protected_result_t* out_result) {
+
+    // install exception handler
+    if (exceptionHandlerInstalled == FALSE) {
+        exceptionHandlerInstalled = TRUE;
+        AddVectoredExceptionHandler(CALL_FIRST, exceptionHandler);
+    }
+
+    // jmp jmp jmp!
+    int signum = setjmp(jmpBuf);
+    if (signum == 0) {
+        // save the stack pointer
+        savedStackPointer = get_callee_frame_address();
+        trampoline(ctx, func, param_vec, return_vec);
+        out_result->code = 0;
+        out_result->exceptionAddress = 0;
+        out_result->instructionPointer = 0;
+        return TRUE;
+    }
+
+    out_result->code = (uint64_t)signum;
+    out_result->exceptionAddress = (uint64_t)caughtExceptionAddress;
+    out_result->instructionPointer = caughtInstructionPointer;
+
+    caughtExceptionAddress = 0;
+    caughtInstructionPointer = 0;
+
+    return FALSE;
+}

lib/win-exception-handler/exception_handling/exception_handling.h

@@ -0,0 +1,25 @@
+#ifndef WASMER_EXCEPTION_HANDLING_H
+#define WASMER_EXCEPTION_HANDLING_H
+
+#include <stdint.h>
+
+struct func_t;
+struct wasmer_instance_context_t;
+
+typedef void(*trampoline_t)(struct wasmer_instance_context_t*,  const struct func_t*, const uint64_t*, uint64_t*);
+
+struct call_protected_result_t {
+    uint64_t code;
+    uint64_t exceptionAddress;
+    uint64_t instructionPointer;
+};
+
+uint8_t callProtected(
+        trampoline_t trampoline,
+        const struct wasmer_instance_context_t* ctx,
+        const struct func_t* func,
+        const uint64_t* param_vec,
+        uint64_t* return_vec,
+        struct call_protected_result_t* out_result);
+
+#endif //WASMER_EXCEPTION_HANDLING_H

lib/win-exception-handler/src/exception_handling.rs

@@ -0,0 +1,55 @@
+use std::ffi::c_void;
+use wasmer_runtime_core::vm::{Ctx, Func};
+
+type Trampoline = unsafe extern "C" fn(*mut Ctx, *const Func, *const u64, *mut u64) -> c_void;
+type CallProtectedResult = Result<(), CallProtectedData>;
+
+#[repr(C)]
+pub struct CallProtectedData {
+    pub code: u64,
+    pub exceptionAddress: u64,
+    pub instructionPointer: u64,
+}
+
+extern "C" {
+    #[link_name = "callProtected"]
+    pub fn __call_protected(
+        trampoline: Trampoline,
+        ctx: *mut Ctx,
+        func: *const Func,
+        param_vec: *const u64,
+        return_vec: *mut u64,
+        out_result: *mut CallProtectedData,
+    ) -> u8;
+}
+
+pub fn _call_protected(
+    trampoline: Trampoline,
+    ctx: *mut Ctx,
+    func: *const Func,
+    param_vec: *const u64,
+    return_vec: *mut u64,
+) -> CallProtectedResult {
+    let mut out_result = CallProtectedData {
+        code: 0,
+        exceptionAddress: 0,
+        instructionPointer: 0,
+    };
+    let result = unsafe {
+        __call_protected(
+            trampoline,
+            ctx,
+            func,
+            param_vec,
+            return_vec,
+            &mut out_result,
+        )
+    };
+    println!("result from __call_protected: {}", result);
+    if result == 1 {
+        Ok(())
+    } else {
+        println!("returning error from _call_protected");
+        Err(out_result)
+    }
+}

lib/win-exception-handler/src/lib.rs

@@ -0,0 +1,5 @@
+#[cfg(windows)]
+mod exception_handling;
+
+#[cfg(windows)]
+pub use self::exception_handling::*;

src/bin/wasmer.rs

@@ -69,7 +69,7 @@ fn execute_wasm(options: &Run) -> Result<(), String> {
     let module = webassembly::compile(&wasm_binary[..])
         .map_err(|e| format!("Can't compile module: {:?}", e))?;
 
-    let (_abi, import_object, em_globals) = if wasmer_emscripten::is_emscripten_module(&module) {
+    let (_abi, import_object, _em_globals) = if wasmer_emscripten::is_emscripten_module(&module) {
         let mut emscripten_globals = wasmer_emscripten::EmscriptenGlobals::new(&module);
         (
             InstanceABI::Emscripten,