Bug 1546293 - Improve Wasm gating for Ion. r=jseward
authorLars T Hansen <lhansen@mozilla.com>
Tue, 23 Apr 2019 10:02:53 +0200
changeset 529987 55de487e32e6c6b01f1e37ee96f23a63e5c8b638
parent 529986 968d4ed2e984a65bfb8bd60a9820c4aa45624dd5
child 529988 da523e237c3d922401d8d3e53fdabe14621d7eac
push id11265
push userffxbld-merge
push dateMon, 13 May 2019 10:53:39 +0000
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Bug 1546293 - Improve Wasm gating for Ion. r=jseward Gating that explicitly lists the architectures that are supported is more resilient than one that lists architectures that are not. Differential Revision: https://phabricator.services.mozilla.com/D28447
--- a/js/src/jit/shared/AtomicOperations-feeling-lucky-gcc.h
+++ b/js/src/jit/shared/AtomicOperations-feeling-lucky-gcc.h
@@ -39,23 +39,19 @@
 #if !(defined(__clang__) || defined(__GNUC__))
 #  error "This file only for gcc/Clang"
 // 64-bit atomics are not required by the JS spec, and you can compile
 // SpiderMonkey without them.
-// 64-bit lock-free atomics are however required for WebAssembly, and
-// WebAssembly will be disabled if you do not define both HAS_64BIT_ATOMICS and
-// If you are only able to provide 64-bit non-lock-free atomics and you really
-// want WebAssembly support you can always just lie about the lock-freedom.
-// After all, you're already feeling lucky.
+// 64-bit lock-free atomics are required for WebAssembly, but gating in the
+// WebAssembly subsystem ensures that no WebAssembly-supporting platforms need
+// code in this file.
 #if defined(JS_SIMULATOR_ARM64) || defined(JS_SIMULATOR_ARM)
 // On some x86 (32-bit) systems this will not work because the compiler does not
 // open-code 64-bit atomics.  If so, try linking with -latomic.  If that doesn't
 // work, you're mostly on your own.
 #  define HAS_64BIT_ATOMICS
 #  define HAS_64BIT_LOCKFREE
--- a/js/src/wasm/WasmIonCompile.cpp
+++ b/js/src/wasm/WasmIonCompile.cpp
@@ -4267,14 +4267,16 @@ bool wasm::IonCompileFunctions(const Mod
   if (masm.oom()) {
     return false;
   return code->swap(masm);
 bool js::wasm::IonCanCompile() {
-#if !defined(JS_CODEGEN_NONE) && !defined(JS_CODEGEN_ARM64)
+#if defined(JS_CODEGEN_X64) || defined(JS_CODEGEN_X86) ||    \
+    defined(JS_CODEGEN_ARM) || defined(JS_CODEGEN_MIPS32) || \
+    defined(JS_CODEGEN_MIPS64)
   return true;
   return false;