[WebAssembly] Compute and export TLS block alignment
Summary:
Add immutable WASM global `__tls_align` which stores the alignment
requirements of the TLS segment.
Add `__builtin_wasm_tls_align()` intrinsic to get this alignment in Clang.
The expected usage has now changed to:
__wasm_init_tls(memalign(__builtin_wasm_tls_align(),
__builtin_wasm_tls_size()));
Reviewers: tlively, aheejin, sbc100, sunfish, alexcrichton
Reviewed By: tlively
Subscribers: dschuff, jgravelle-google, hiraditya, cfe-commits, llvm-commits
Tags: #clang, #llvm
Differential Revision: https://reviews.llvm.org/D65028
llvm-svn: 366624
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 8c7411fc..dee1e20 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -13924,6 +13924,11 @@
Function *Callee = CGM.getIntrinsic(Intrinsic::wasm_tls_size, ResultType);
return Builder.CreateCall(Callee);
}
+ case WebAssembly::BI__builtin_wasm_tls_align: {
+ llvm::Type *ResultType = ConvertType(E->getType());
+ Function *Callee = CGM.getIntrinsic(Intrinsic::wasm_tls_align, ResultType);
+ return Builder.CreateCall(Callee);
+ }
case WebAssembly::BI__builtin_wasm_tls_base: {
Function *Callee = CGM.getIntrinsic(Intrinsic::wasm_tls_base);
return Builder.CreateCall(Callee);