[WebAssembly] Made assembler only use stack instruction tablegen defs

Summary:
This ensures we have the non-register version of the instruction.

The stack version of call_indirect now wants a type index argument,
so that has been added in the existing tests.

Tested:
llvm-lit -v `find test -name WebAssembly`

Reviewers: dschuff

Subscribers: sbc100, jgravelle-google, aheejin, sunfish, llvm-commits

Differential Revision: https://reviews.llvm.org/D51662

llvm-svn: 342753

llvm/test/MC/WebAssembly/basic-assembly.s

@@ -29,7 +29,7 @@ test0:
     i64.const   1234
     i32.call    something2@FUNCTION
     i32.const   0
-    call_indirect
+    call_indirect 0
     i32.const   1
     i32.add
     tee_local   0
@@ -68,7 +68,7 @@ test0:
 # CHECK-NEXT:      i64.const   1234
 # CHECK-NEXT:      i32.call    something2@FUNCTION
 # CHECK-NEXT:      i32.const   0
-# CHECK-NEXT:      call_indirect
+# CHECK-NEXT:      call_indirect 0
 # CHECK-NEXT:      i32.const   1
 # CHECK-NEXT:      i32.add
 # CHECK-NEXT:      tee_local   0

llvm/utils/TableGen/AsmMatcherEmitter.cpp

@@ -1479,6 +1479,8 @@ void AsmMatcherInfo::buildInfo() {
   bool ReportMultipleNearMisses =
       AsmParser->getValueAsBit("ReportMultipleNearMisses");
 
+  bool IsWebAssemblyTarget = Target.getName() == "WebAssembly";
+
   // Parse the instructions; we need to do this first so that we can gather the
   // singleton register classes.
   SmallPtrSet<Record*, 16> SingletonRegisters;
@@ -1514,6 +1516,14 @@ void AsmMatcherInfo::buildInfo() {
       if (!V.empty() && V != Variant.Name)
         continue;
 
+      // [WebAssembly] Ignore non-stack instructions.
+      if (IsWebAssemblyTarget) {
+        auto Bit = CGI->TheDef->getValue("StackBased")->getValue()->
+                     getCastTo(BitRecTy::get());
+        if (!Bit || !reinterpret_cast<const BitInit *>(Bit)->getValue())
+          continue;
+      }
+
       auto II = llvm::make_unique<MatchableInfo>(*CGI);
 
       II->initialize(*this, SingletonRegisters, Variant, HasMnemonicFirst);