nickdesaulniers created this revision.
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nickdesaulniers requested review of this revision.
Herald added projects: clang, LLVM.
Herald added subscribers: llvm-commits, cfe-commits.
Due to inlining, descovering which specific call site to a function with
the attribute "warning" or "error" is painful.
In the IR record inlining decisions in metadata when inlining a callee
that itself contains a call to a dontcall-error or dontcall-warn fn.
Print this info so that it's clearer which call site is problematic.
TODO: update tests
Fixes: https://github.com/ClangBuiltLinux/linux/issues/1571
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D141451
Files:
clang/include/clang/Basic/DiagnosticFrontendKinds.td
clang/lib/CodeGen/CodeGenAction.cpp
llvm/include/llvm/IR/DiagnosticInfo.h
llvm/lib/IR/DiagnosticInfo.cpp
llvm/lib/Transforms/Utils/InlineFunction.cpp
llvm/test/Transforms/Inline/dontcall-attributes.ll
Index: llvm/test/Transforms/Inline/dontcall-attributes.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/Inline/dontcall-attributes.ll
@@ -0,0 +1,57 @@
+; RUN: opt -S -o - -passes=inline %s | FileCheck %s
+
+declare void @foo() "dontcall-warn"="oh no"
+declare void @fof() "dontcall-error"="oh no"
+
+define void @bar(i32 %x) {
+ %cmp = icmp eq i32 %x, 10
+ br i1 %cmp, label %if.then, label %if.end
+
+if.then:
+ call void @foo()
+ br label %if.end
+
+if.end:
+ ret void
+}
+
+define void @quux() {
+ call void @bar(i32 9)
+ ret void
+}
+
+; Test that @baz's call to @foo has metadata with inlining info.
+define void @baz() {
+; CHECK-LABEL: @baz(
+; CHECK-NEXT: call void @foo(), !inlined-from !0
+;
+ call void @bar(i32 10)
+ ret void
+}
+
+; Test that @zing's call to @foo has unique metadata from @baz's call to @foo.
+define void @zing() {
+; CHECK-LABEL: @zing(
+; CHECK-NEXT: call void @foo(), !inlined-from !1
+;
+ call void @baz()
+ ret void
+}
+
+; Same test but @fof has fn attr "dontcall-error"="..." rather than
+; "dontcall-warn"="...".
+define void @a() {
+ call void @fof()
+ ret void
+}
+define void @b() {
+; CHECK-LABEL: @b(
+; CHECK-NEXT: call void @fof(), !inlined-from !3
+ call void @a()
+ ret void
+}
+
+; CHECK: !0 = !{!"bar"}
+; CHECK: !1 = !{!2}
+; CHECK: !2 = !{!"bar", !"baz"}
+; CHECK: !3 = !{!"a"}
Index: llvm/lib/Transforms/Utils/InlineFunction.cpp
===================================================================
--- llvm/lib/Transforms/Utils/InlineFunction.cpp
+++ llvm/lib/Transforms/Utils/InlineFunction.cpp
@@ -2463,6 +2463,19 @@
// inlining, commonly when the callee is an intrinsic.
if (MarkNoUnwind && !CI->doesNotThrow())
CI->setDoesNotThrow();
+
+ const Function *Callee = CI->getCalledFunction();
+ if (Callee && (Callee->hasFnAttribute("dontcall-error") ||
+ Callee->hasFnAttribute("dontcall-warn"))) {
+ Metadata *MD = MDString::get(CI->getContext(), CalledFunc->getName());
+ if (MDNode *N = CI->getMetadata("inlined-from")) {
+ TempMDTuple Temp = cast<MDTuple>(N)->clone();
+ Temp->push_back(MD);
+ MD = MDNode::replaceWithUniqued(std::move(Temp));
+ }
+ MDTuple *MDT = MDNode::get(CI->getContext(), {MD});
+ CI->setMetadata("inlined-from", MDT);
+ }
}
}
}
Index: llvm/lib/IR/DiagnosticInfo.cpp
===================================================================
--- llvm/lib/IR/DiagnosticInfo.cpp
+++ llvm/lib/IR/DiagnosticInfo.cpp
@@ -12,6 +12,7 @@
//===----------------------------------------------------------------------===//
#include "llvm/IR/DiagnosticInfo.h"
+#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Twine.h"
#include "llvm/ADT/iterator_range.h"
@@ -430,8 +431,9 @@
if (MDNode *MD = CI.getMetadata("srcloc"))
LocCookie =
mdconst::extract<ConstantInt>(MD->getOperand(0))->getZExtValue();
- DiagnosticInfoDontCall D(F->getName(), A.getValueAsString(), Sev,
- LocCookie);
+ DiagnosticInfoDontCall D(CI.getParent()->getParent()->getName(),
+ F->getName(), A.getValueAsString(), Sev,
+ LocCookie, CI.getMetadata("inlined-from"));
F->getContext().diagnose(D);
}
}
@@ -446,3 +448,20 @@
if (!getNote().empty())
DP << ": " << getNote();
}
+
+void DiagnosticInfoDontCall::getInliningDecisions(
+ SmallVectorImpl<StringRef> &InliningDecisions) const {
+ if (!MDN)
+ return;
+
+ const MDOperand &MO = MDN->getOperand(0);
+ if (auto *MDT = dyn_cast<MDTuple>(MO)) {
+ for (unsigned i = MDT->getNumOperands(); i; --i) {
+ if (auto *S = dyn_cast<MDString>(MDT->getOperand(i - 1))) {
+ InliningDecisions.push_back(S->getString());
+ }
+ }
+ } else if (auto *S = dyn_cast<MDString>(MO)) {
+ InliningDecisions.push_back(S->getString());
+ }
+}
Index: llvm/include/llvm/IR/DiagnosticInfo.h
===================================================================
--- llvm/include/llvm/IR/DiagnosticInfo.h
+++ llvm/include/llvm/IR/DiagnosticInfo.h
@@ -1099,15 +1099,19 @@
void diagnoseDontCall(const CallInst &CI);
class DiagnosticInfoDontCall : public DiagnosticInfo {
+ StringRef CallerName;
StringRef CalleeName;
StringRef Note;
unsigned LocCookie;
+ MDNode *MDN;
public:
- DiagnosticInfoDontCall(StringRef CalleeName, StringRef Note,
- DiagnosticSeverity DS, unsigned LocCookie)
- : DiagnosticInfo(DK_DontCall, DS), CalleeName(CalleeName), Note(Note),
- LocCookie(LocCookie) {}
+ DiagnosticInfoDontCall(StringRef CallerName, StringRef CalleeName,
+ StringRef Note, DiagnosticSeverity DS,
+ unsigned LocCookie, MDNode *MDN)
+ : DiagnosticInfo(DK_DontCall, DS), CallerName(CallerName),
+ CalleeName(CalleeName), Note(Note), LocCookie(LocCookie), MDN(MDN) {}
+ StringRef getCaller() const { return CallerName; }
StringRef getFunctionName() const { return CalleeName; }
StringRef getNote() const { return Note; }
unsigned getLocCookie() const { return LocCookie; }
@@ -1115,6 +1119,8 @@
static bool classof(const DiagnosticInfo *DI) {
return DI->getKind() == DK_DontCall;
}
+ void
+ getInliningDecisions(SmallVectorImpl<StringRef> &InliningDecisions) const;
};
} // end namespace llvm
Index: clang/lib/CodeGen/CodeGenAction.cpp
===================================================================
--- clang/lib/CodeGen/CodeGenAction.cpp
+++ clang/lib/CodeGen/CodeGenAction.cpp
@@ -851,6 +851,14 @@
? diag::err_fe_backend_error_attr
: diag::warn_fe_backend_warning_attr)
<< llvm::demangle(D.getFunctionName().str()) << D.getNote();
+
+ Diags.Report(diag::note_fe_backend_in) << D.getCaller();
+
+ SmallVector<StringRef, 4> InliningDecisions;
+ D.getInliningDecisions(InliningDecisions);
+ for (StringRef S : InliningDecisions) {
+ Diags.Report(diag::note_fe_backend_inlined) << S;
+ }
}
void BackendConsumer::MisExpectDiagHandler(
Index: clang/include/clang/Basic/DiagnosticFrontendKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticFrontendKinds.td
+++ clang/include/clang/Basic/DiagnosticFrontendKinds.td
@@ -90,6 +90,8 @@
def warn_fe_backend_warning_attr :
Warning<"call to '%0' declared with 'warning' attribute: %1">, BackendInfo,
InGroup<BackendWarningAttributes>;
+def note_fe_backend_in : Note<"In function '%0'">;
+def note_fe_backend_inlined : Note<"\twhich inlined function '%0'">;
def err_fe_invalid_code_complete_file : Error<
"cannot locate code-completion file %0">, DefaultFatal;
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