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[WebAssembly] Implement __builtin_wasm_tls_base intrinsic

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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
This commit is contained in:
Guanzhong Chen 2019-07-18 17:53:22 +00:00
parent 9e600b667f
commit 06b4c69d40
3 changed files with 32 additions and 0 deletions
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5
include/llvm/IR/IntrinsicsWebAssembly.td
View File

@ -133,4 +133,9 @@ def int_wasm_tls_size :
[],
[IntrNoMem, IntrSpeculatable]>;
def int_wasm_tls_base :
Intrinsic<[llvm_ptr_ty],
[],
[IntrReadMem]>;
} // TargetPrefix = "wasm"

17
lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp
View File

@ -227,6 +227,23 @@ void WebAssemblyDAGToDAGISel::Select(SDNode *Node) {
}
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;

10
test/CodeGen/WebAssembly/tls-general-dynamic.ll
View File

@ -75,6 +75,15 @@ define i32 @tls_size() {
ret i32 %1
}
; CHECK-LABEL: tls_base:
; CHECK-NEXT: .functype tls_base () -> (i32)
define i8* @tls_base() {
; CHECK-NEXT: global.get __tls_base
; CHECK-NEXT: return
%1 = call i8* @llvm.wasm.tls.base()
ret i8* %1
}
; CHECK: .type tls,@object
; TLS-NEXT: .section .tbss.tls,"",@
; NO-TLS-NEXT: .section .bss.tls,"",@
@ -84,3 +93,4 @@ define i32 @tls_size() {
@tls = internal thread_local global i32 0
declare i32 @llvm.wasm.tls.size.i32()
declare i8* @llvm.wasm.tls.base()