[WebAssembly] Implement __builtin_wasm_tls_base intrinsic
Summary:
Add `__builtin_wasm_tls_base` so that LeakSanitizer can find the thread-local
block and scan through it for memory leaks.
Reviewers: tlively, aheejin, sbc100
Subscribers: dschuff, jgravelle-google, hiraditya, sunfish, cfe-commits, llvm-commits
Tags: #clang, #llvm
Differential Revision: https://reviews.llvm.org/D64900
llvm-svn: 366475
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp
index 26339ea..e57e194 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp
@@ -227,6 +227,23 @@
}
break;
}
+ case ISD::INTRINSIC_W_CHAIN: {
+ unsigned IntNo = cast<ConstantSDNode>(Node->getOperand(1))->getZExtValue();
+ switch (IntNo) {
+ case Intrinsic::wasm_tls_base: {
+ MVT PtrVT = TLI->getPointerTy(CurDAG->getDataLayout());
+ assert(PtrVT == MVT::i32 && "only wasm32 is supported for now");
+
+ MachineSDNode *TLSBase = CurDAG->getMachineNode(
+ WebAssembly::GLOBAL_GET_I32, DL, MVT::i32,
+ CurDAG->getTargetExternalSymbol("__tls_base", PtrVT),
+ Node->getOperand(0));
+ ReplaceNode(Node, TLSBase);
+ return;
+ }
+ }
+ break;
+ }
default:
break;