[WebAssembly] Add atomics target option

[aheejin]

• Fix typo

[tlively]

lib/Basic/Targets/WebAssembly.cpp

172

-atomics

[tlively]

LGTM

lib/Basic/Targets/WebAssembly.cpp

172

You won the race!

test/Preprocessor/wasm-target-features.c

89

Nice.

[sbc100]

How does this relate to the existing -mattr=+atomics of llc? Will it also result in attributes #0 = { "target-features"="+atomics" } in the bitcode?

[aheejin]

In D57798#1386470, @sbc100 wrote:

How does this relate to the existing -mattr=+atomics of llc? Will it also result in attributes #0 = { "target-features"="+atomics" } in the bitcode?

Yes

include/clang/Driver/Options.td

 def mnontrapping_fptoint : Flag<["-"], "mnontrapping-fptoint">, Group<m_wasm_Features_Group>;
 def mno_nontrapping_fptoint : Flag<["-"], "mno-nontrapping-fptoint">, Group<m_wasm_Features_Group>;
 def msign_ext : Flag<["-"], "msign-ext">, Group<m_wasm_Features_Group>;
 def mno_sign_ext : Flag<["-"], "mno-sign-ext">, Group<m_wasm_Features_Group>;
 def mexception_handing : Flag<["-"], "mexception-handling">, Group<m_wasm_Features_Group>;
 def mno_exception_handing : Flag<["-"], "mno-exception-handling">, Group<m_wasm_Features_Group>;
 def mbulk_memory : Flag<["-"], "mbulk-memory">, Group<m_wasm_Features_Group>;
 def mno_bulk_memory : Flag<["-"], "mno-bulk-memory">, Group<m_wasm_Features_Group>;
+def matomics : Flag<["-"], "matomics">, Group<m_wasm_Features_Group>;
+def mno_atomics : Flag<["-"], "mno-atomics">, Group<m_wasm_Features_Group>;
 
 def mamdgpu_debugger_abi : Joined<["-"], "mamdgpu-debugger-abi=">,
   Flags<[HelpHidden]>,
   Group<m_Group>,
   HelpText<"Generate additional code for specified <version> of debugger ABI (AMDGPU only)">,
   MetaVarName<"<version>">;
 
 def mcode_object_v3 : Flag<["-"], "mcode-object-v3">, Group<m_amdgpu_Features_Group>,

lib/Basic/Targets/WebAssembly.h

enum SIMDEnum {
     SIMD128,
     UnimplementedSIMD128,
   } SIMDLevel = NoSIMD;
 
   bool HasNontrappingFPToInt = false;
   bool HasSignExt = false;
   bool HasExceptionHandling = false;
   bool HasBulkMemory = false;
+  bool HasAtomics = false;
 
 public:
   explicit WebAssemblyTargetInfo(const llvm::Triple &T, const TargetOptions &)
       : TargetInfo(T) {
     NoAsmVariants = true;
     SuitableAlign = 128;
     LargeArrayMinWidth = 128;
     LargeArrayAlign = 128;

lib/Basic/Targets/WebAssembly.cpp

 bool WebAssemblyTargetInfo::hasFeature(StringRef Feature) const {
   return llvm::StringSwitch<bool>(Feature)
       .Case("simd128", SIMDLevel >= SIMD128)
       .Case("unimplemented-simd128", SIMDLevel >= UnimplementedSIMD128)
       .Case("nontrapping-fptoint", HasNontrappingFPToInt)
       .Case("sign-ext", HasSignExt)
       .Case("exception-handling", HasExceptionHandling)
       .Case("bulk-memory", HasBulkMemory)
+      .Case("atomics", HasAtomics)
       .Default(false);
 }
 
 bool WebAssemblyTargetInfo::isValidCPUName(StringRef Name) const {
   return llvm::find(ValidCPUNames, Name) != std::end(ValidCPUNames);
 }
 
 void WebAssemblyTargetInfo::fillValidCPUList(
void WebAssemblyTargetInfo::getTargetDefines(const LangOptions &Opts,
   if (HasNontrappingFPToInt)
     Builder.defineMacro("__wasm_nontrapping_fptoint__");
   if (HasSignExt)
     Builder.defineMacro("__wasm_sign_ext__");
   if (HasExceptionHandling)
     Builder.defineMacro("__wasm_exception_handling__");
   if (HasBulkMemory)
     Builder.defineMacro("__wasm_bulk_memory__");
+  if (HasAtomics)
+    Builder.defineMacro("__wasm_atomics__");
 }
 
 void WebAssemblyTargetInfo::setSIMDLevel(llvm::StringMap<bool> &Features,
                                          SIMDEnum Level) {
   switch (Level) {
   case UnimplementedSIMD128:
     Features["unimplemented-simd128"] = true;
     LLVM_FALLTHROUGH;
   case SIMD128:
     Features["simd128"] = true;
     LLVM_FALLTHROUGH;
   case NoSIMD:
     break;
   }
 }
 
 bool WebAssemblyTargetInfo::initFeatureMap(
     llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags, StringRef CPU,
     const std::vector<std::string> &FeaturesVec) const {
   if (CPU == "bleeding-edge") {
     Features["nontrapping-fptoint"] = true;
     Features["sign-ext"] = true;
+    Features["atomics"] = true;
     setSIMDLevel(Features, SIMD128);
   }
   // Other targets do not consider user-configured features here, but while we
   // are actively developing new features it is useful to let user-configured
   // features control availability of builtins
   setSIMDLevel(Features, SIMDLevel);
   if (HasNontrappingFPToInt)
     Features["nontrapping-fptoint"] = true;
   if (HasSignExt)
     Features["sign-ext"] = true;
   if (HasExceptionHandling)
     Features["exception-handling"] = true;
   if (HasBulkMemory)
     Features["bulk-memory"] = true;
+  if (HasAtomics)
+    Features["atomics"] = true;
 
   return TargetInfo::initFeatureMap(Features, Diags, CPU, FeaturesVec);
 }
 
 bool WebAssemblyTargetInfo::handleTargetFeatures(
     std::vector<std::string> &Features, DiagnosticsEngine &Diags) {
   for (const auto &Feature : Features) {
     if (Feature == "+simd128") {
for (const auto &Feature : Features) {
     if (Feature == "+bulk-memory") {
       HasBulkMemory = true;
       continue;
     }
     if (Feature == "-bulk-memory") {
       HasBulkMemory = false;
       continue;
     }
+    if (Feature == "+atomics") {
+      HasAtomics = true;
+      continue;
+    }
+    if (Feature == "0atomics") {
+      HasAtomics = false;
+      continue;
+    }
 
     Diags.Report(diag::err_opt_not_valid_with_opt)
         << Feature << "-target-feature";
     return false;
   }
   return true;
 }
 

test/Preprocessor/wasm-target-features.c

 // RUN:   | FileCheck %s -check-prefix=BULK-MEMORY
 // RUN: %clang -E -dM %s -o - 2>&1 \
 // RUN:     -target wasm64-unknown-unknown -mbulk-memory \
 // RUN:   | FileCheck %s -check-prefix=BULK-MEMORY
 //
 // BULK-MEMORY:#define __wasm_bulk_memory__ 1{{$}}
 //
 // RUN: %clang -E -dM %s -o - 2>&1 \
+// RUN:     -target wasm32-unknown-unknown -matomics \
+// RUN:   | FileCheck %s -check-prefix=ATOMICS
+// RUN: %clang -E -dM %s -o - 2>&1 \
+// RUN:     -target wasm64-unknown-unknown -matomics \
+// RUN:   | FileCheck %s -check-prefix=ATOMICS
+//
+// ATOMICS:#define __wasm_atomics__ 1{{$}}
+//
+// RUN: %clang -E -dM %s -o - 2>&1 \
 // RUN:     -target wasm32-unknown-unknown -mcpu=mvp \
 // RUN:   | FileCheck %s -check-prefix=MVP
 // RUN: %clang -E -dM %s -o - 2>&1 \
 // RUN:     -target wasm64-unknown-unknown -mcpu=mvp \
 // RUN:   | FileCheck %s -check-prefix=MVP
 //
 // MVP-NOT:#define __wasm_simd128__
 // MVP-NOT:#define __wasm_unimplemented_simd128__
 // MVP-NOT:#define __wasm_nontrapping_fptoint__
 // MVP-NOT:#define __wasm_sign_ext__
 // MVP-NOT:#define __wasm_exception_handling__
 // MVP-NOT:#define __wasm_bulk_memory__
+// MVP-NOT:#define __wasm_atomics__
 //
 // RUN: %clang -E -dM %s -o - 2>&1 \
 // RUN:     -target wasm32-unknown-unknown -mcpu=bleeding-edge \
 // RUN:   | FileCheck %s -check-prefix=BLEEDING-EDGE
 // RUN: %clang -E -dM %s -o - 2>&1 \
 // RUN:     -target wasm64-unknown-unknown -mcpu=bleeding-edge \
 // RUN:   | FileCheck %s -check-prefix=BLEEDING-EDGE
 //
-// BLEEDING-EDGE:#define __wasm_nontrapping_fptoint__ 1{{$}}
-// BLEEDING-EDGE:#define __wasm_sign_ext__ 1{{$}}
-// BLEEDING-EDGE:#define __wasm_simd128__ 1{{$}}
+// BLEEDING-EDGE-DAG:#define __wasm_nontrapping_fptoint__ 1{{$}}
+// BLEEDING-EDGE-DAG:#define __wasm_sign_ext__ 1{{$}}
+// BLEEDING-EDGE-DAG:#define __wasm_simd128__ 1{{$}}
+// BLEEDING-EDGE-DAG:#define __wasm_atomics__ 1{{$}}
 // BLEEDING-EDGE-NOT:#define __wasm_unimplemented_simd128__ 1{{$}}
 //
 // RUN: %clang -E -dM %s -o - 2>&1 \
 // RUN:     -target wasm32-unknown-unknown -mcpu=bleeding-edge -mno-simd128 \
 // RUN:   | FileCheck %s -check-prefix=BLEEDING-EDGE-NO-SIMD128
 // RUN: %clang -E -dM %s -o - 2>&1 \
 // RUN:     -target wasm64-unknown-unknown -mcpu=bleeding-edge -mno-simd128 \
 // RUN:   | FileCheck %s -check-prefix=BLEEDING-EDGE-NO-SIMD128
 //
 // BLEEDING-EDGE-NO-SIMD128-NOT:#define __wasm_simd128__