[XRay] Add __xray_customeevent(...) as a clang-supported builtin
Summary:
We define the `__xray_customeevent` builtin that gets translated to
IR calls to the correct intrinsic. The default implementation of this is
a no-op function. The codegen side of this follows the following logic:
- When `-fxray-instrument` is not provided in the driver, we elide all
calls to `__xray_customevent`.
- When `-fxray-instrument` is enabled and a function is marked as "never
instrumented", we elide all calls to `__xray_customevent` in that
function; if either marked as "always instrumented" or subject to
threshold-based instrumentation, we emit a call to the
`llvm.xray.customevent` intrinsic from LLVM for each
`__xray_customevent` occurrence in the function.
This change depends on D27503 (to land in LLVM first).
Reviewers: echristo, rsmith
Subscribers: mehdi_amini, pelikan, lrl, cfe-commits
Differential Revision: https://reviews.llvm.org/D30018
llvm-svn: 302492
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 2f05c0e..698bef2 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -2769,6 +2769,32 @@
return RValue::get(ConstantInt::get(ConvertType(E->getType()),
Layout.size().getQuantity()));
}
+
+ case Builtin::BI__xray_customevent: {
+ if (!ShouldXRayInstrumentFunction())
+ return RValue::getIgnored();
+ if (const auto *XRayAttr = CurFuncDecl->getAttr<XRayInstrumentAttr>()) {
+ if (XRayAttr->neverXRayInstrument())
+ return RValue::getIgnored();
+ }
+ Function *F = CGM.getIntrinsic(Intrinsic::xray_customevent);
+ auto FTy = F->getFunctionType();
+ auto Arg0 = E->getArg(0);
+ auto Arg0Val = EmitScalarExpr(Arg0);
+ auto Arg0Ty = Arg0->getType();
+ auto PTy0 = FTy->getParamType(0);
+ if (PTy0 != Arg0Val->getType()) {
+ if (Arg0Ty->isArrayType())
+ Arg0Val = EmitArrayToPointerDecay(Arg0).getPointer();
+ else
+ Arg0Val = Builder.CreatePointerCast(Arg0Val, PTy0);
+ }
+ auto Arg1 = EmitScalarExpr(E->getArg(1));
+ auto PTy1 = FTy->getParamType(1);
+ if (PTy1 != Arg1->getType())
+ Arg1 = Builder.CreateTruncOrBitCast(Arg1, PTy1);
+ return RValue::get(Builder.CreateCall(F, {Arg0Val, Arg1}));
+ }
}
// If this is an alias for a lib function (e.g. __builtin_sin), emit