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[rtsan] Handle attributed IR function declarations #169577

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[rtsan] Handle attributed IR function declarations #169577

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16 changes: 7 additions & 9 deletions llvm/lib/Transforms/Instrumentation/RealtimeSanitizer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -61,23 +61,21 @@ static void insertCallAtAllFunctionExitPoints(Function &Fn,
insertCallBeforeInstruction(Fn, I, InsertFnName, FunctionArgs);
}

static PreservedAnalyses rtsanPreservedCFGAnalyses() {
PreservedAnalyses PA;
PA.preserveSet<CFGAnalyses>();
return PA;
}
static void runSanitizeRealtime(Function &Fn) {
if (Fn.empty())
return;
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@cjappl cjappl Nov 26, 2025

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Is there precedence in other sanitizer passes for doing this? (Curious how they solved this problem)


static PreservedAnalyses runSanitizeRealtime(Function &Fn) {
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@cjappl cjappl Nov 26, 2025

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Is not returning these preserved analyses going to bite us elsewhere? I remember most of the sanitizer transform passes (or transform passes generally) returning these.

insertCallAtFunctionEntryPoint(Fn, "__rtsan_realtime_enter", {});
insertCallAtAllFunctionExitPoints(Fn, "__rtsan_realtime_exit", {});
return rtsanPreservedCFGAnalyses();
}

static PreservedAnalyses runSanitizeRealtimeBlocking(Function &Fn) {
static void runSanitizeRealtimeBlocking(Function &Fn) {
if (Fn.empty())
return;

IRBuilder<> Builder(&Fn.front().front());
Value *Name = Builder.CreateGlobalString(demangle(Fn.getName()));
insertCallAtFunctionEntryPoint(Fn, "__rtsan_notify_blocking_call", {Name});
return rtsanPreservedCFGAnalyses();
}

PreservedAnalyses RealtimeSanitizerPass::run(Module &M,
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12 changes: 12 additions & 0 deletions llvm/test/Instrumentation/RealtimeSanitizer/rtsan_attrib_declare.ll
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Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
; RUN: opt < %s -passes='rtsan' -S | FileCheck %s

declare void @declared_realtime_function() sanitize_realtime #0

declare void @declared_blocking_function() sanitize_realtime_blocking #0

; RealtimeSanitizer pass should ignore attributed functions that are just declarations
; CHECK: declared_realtime_function
; CHECK-EMPTY:
; CHECK: declared_blocking_function
; CHECK-EMPTY: