[WebAssembly] Print error message for llvm.clear_cache intrinsic

Summary:
Wasm does not currently support `llvm.clear_cache` intrinsic, and this
prints a proper error message instead of segfault.

Reviewers: dschuff, sbc100, sunfish

Subscribers: jgravelle-google, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D64322

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@365731 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/WebAssembly/WebAssemblyISelLowering.h b/lib/Target/WebAssembly/WebAssemblyISelLowering.h
index ce4ef14..b3c7f3d 100644 (file)
--- a/lib/Target/WebAssembly/WebAssemblyISelLowering.h
+++ b/lib/Target/WebAssembly/WebAssemblyISelLowering.h
@@ -89,6 +89,10 @@ private:
   void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue> &Results,
                           SelectionDAG &DAG) const override;
 
+  const char *getClearCacheBuiltinName() const override {
+    report_fatal_error("llvm.clear_cache is not supported on wasm");
+  }
+
   // Custom lowering hooks.
   SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
   SDValue LowerFrameIndex(SDValue Op, SelectionDAG &DAG) const;

diff --git a/test/CodeGen/WebAssembly/clear-cache.ll b/test/CodeGen/WebAssembly/clear-cache.ll
new file mode 100644 (file)
index 0000000..cab9488
--- /dev/null
+++ b/test/CodeGen/WebAssembly/clear-cache.ll
@@ -0,0 +1,13 @@
+; RUN: not llc < %s -asm-verbose=false 2>&1 | FileCheck %s
+
+target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
+target triple = "wasm32-unknown-unknown"
+
+; CHECK: LLVM ERROR: llvm.clear_cache is not supported on wasm
+define void @clear_cache(i8* %begin, i8* %end) {
+entry:
+  call void @llvm.clear_cache(i8* %begin, i8* %end)
+  ret void
+}
+
+declare void @llvm.clear_cache(i8*, i8*)