[llvm] 296ccef - [WebAssembly] EmscriptenEHSjLj: Mark __invoke_ functions as imported
Sam Clegg via llvm-commits
llvm-commits at lists.llvm.org
Wed Apr 1 16:33:56 PDT 2020
Author: Sam Clegg
Date: 2020-04-01T16:33:33-07:00
New Revision: 296ccef70363df9195bc678ad5501dd44de7f8fb
URL: https://github.com/llvm/llvm-project/commit/296ccef70363df9195bc678ad5501dd44de7f8fb
DIFF: https://github.com/llvm/llvm-project/commit/296ccef70363df9195bc678ad5501dd44de7f8fb.diff
LOG: [WebAssembly] EmscriptenEHSjLj: Mark __invoke_ functions as imported
This means the linker will be expect them be undefined at link time an
will generate imports from the `env` module rather than reporting
undefined externals.
Differential Revision: https://reviews.llvm.org/D77192
Added:
Modified:
llvm/lib/Target/WebAssembly/WebAssemblyLowerEmscriptenEHSjLj.cpp
llvm/test/CodeGen/WebAssembly/lower-em-sjlj.ll
Removed:
################################################################################
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyLowerEmscriptenEHSjLj.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyLowerEmscriptenEHSjLj.cpp
index 89265a3a9520..c8878a48b243 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyLowerEmscriptenEHSjLj.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyLowerEmscriptenEHSjLj.cpp
@@ -344,6 +344,21 @@ static std::string getSignature(FunctionType *FTy) {
return Sig;
}
+static void markAsImported(Function *F) {
+ // Tell the linker that this function is expected to be imported from the
+ // 'env' module.
+ if (!F->hasFnAttribute("wasm-import-module")) {
+ llvm::AttrBuilder B;
+ B.addAttribute("wasm-import-module", "env");
+ F->addAttributes(llvm::AttributeList::FunctionIndex, B);
+ }
+ if (!F->hasFnAttribute("wasm-import-name")) {
+ llvm::AttrBuilder B;
+ B.addAttribute("wasm-import-name", F->getName());
+ F->addAttributes(llvm::AttributeList::FunctionIndex, B);
+ }
+}
+
// Returns __cxa_find_matching_catch_N function, where N = NumClauses + 2.
// This is because a landingpad instruction contains two more arguments, a
// personality function and a cleanup bit, and __cxa_find_matching_catch_N
@@ -360,6 +375,7 @@ WebAssemblyLowerEmscriptenEHSjLj::getFindMatchingCatch(Module &M,
Function *F = Function::Create(
FTy, GlobalValue::ExternalLinkage,
"__cxa_find_matching_catch_" + Twine(NumClauses + 2), &M);
+ markAsImported(F);
FindMatchingCatches[NumClauses] = F;
return F;
}
@@ -469,6 +485,7 @@ Function *WebAssemblyLowerEmscriptenEHSjLj::getInvokeWrapper(CallOrInvoke *CI) {
CalleeFTy->isVarArg());
Function *F =
Function::Create(FTy, GlobalValue::ExternalLinkage, "__invoke_" + Sig, M);
+ markAsImported(F);
InvokeWrappers[Sig] = F;
return F;
}
diff --git a/llvm/test/CodeGen/WebAssembly/lower-em-sjlj.ll b/llvm/test/CodeGen/WebAssembly/lower-em-sjlj.ll
index cad6c4ac855b..ad42cc5f8615 100644
--- a/llvm/test/CodeGen/WebAssembly/lower-em-sjlj.ll
+++ b/llvm/test/CodeGen/WebAssembly/lower-em-sjlj.ll
@@ -308,6 +308,10 @@ attributes #0 = { returns_twice }
attributes #1 = { noreturn }
attributes #2 = { nounwind }
attributes #3 = { allocsize(0) }
+; CHECK: attributes #{{[0-9]+}} = { "wasm-import-module"="env" "wasm-import-name"="__invoke_void" }
+; CHECK: attributes #{{[0-9]+}} = { "wasm-import-module"="env" "wasm-import-name"="__cxa_find_matching_catch_3" }
+; CHECK: attributes #{{[0-9]+}} = { "wasm-import-module"="env" "wasm-import-name"="__invoke_i8*_i32_%struct.__jmp_buf_tag*" }
+; CHECK: attributes #{{[0-9]+}} = { "wasm-import-module"="env" "wasm-import-name"="__invoke_void_%struct.__jmp_buf_tag*_i32" }
; CHECK: attributes #[[ALLOCSIZE_ATTR]] = { allocsize(1) }
!llvm.dbg.cu = !{!2}
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