dberris updated this revision to Diff 140731.
dberris marked 8 inline comments as done.
dberris added a comment.
- fixup: address comments
https://reviews.llvm.org/D44970
Files:
clang/include/clang/Driver/Options.td
clang/include/clang/Driver/XRayArgs.h
clang/include/clang/Frontend/CodeGenOptions.def
clang/include/clang/Frontend/CodeGenOptions.h
clang/lib/CodeGen/CGBuiltin.cpp
clang/lib/CodeGen/CodeGenFunction.cpp
clang/lib/Driver/XRayArgs.cpp
clang/lib/Frontend/CompilerInvocation.cpp
clang/test/CodeGen/xray-instrumentation-bundles.cpp
Index: clang/test/CodeGen/xray-instrumentation-bundles.cpp
===================================================================
--- /dev/null
+++ clang/test/CodeGen/xray-instrumentation-bundles.cpp
@@ -0,0 +1,21 @@
+// RUN: %clang_cc1 -fxray-instrument -fxray-instrumentation-bundle=none -x c++ \
+// RUN: -std=c++11 -triple x86_64-unknown-unknown -emit-llvm -o - %s \
+// RUN: | FileCheck %s
+// RUN: %clang_cc1 -fxray-instrument \
+// RUN: -fxray-instrumentation-bundle=function-extents -x c++ \
+// RUN: -std=c++11 -triple x86_64-unknown-unknown -emit-llvm -o - %s \
+// RUN: | FileCheck %s
+// RUN: %clang_cc1 -fxray-instrument \
+// RUN: -fxray-instrumentation-bundle=none -x c++ \
+// RUN: -std=c++11 -triple x86_64-unknown-unknown -emit-llvm -o - %s \
+// RUN: | FileCheck --check-prefixes CHECK,DISABLE %s
+
+// CHECK-LABEL: alwaysInstrument
+[[clang::xray_always_instrument]] void alwaysInstrument() {
+ static constexpr char kPhase[] = "always";
+ __xray_customevent(kPhase, 6);
+ // CHECK-NOT: call void @llvm.xray.customevent(i8*{{.*}}, i32 6)
+ // DISABLE-NOT: call void @llvm.xray.customevent(i8*{{.*}}, i32 6)
+}
+
+// DISABLE-NOT: function-instrument=always
Index: clang/lib/Frontend/CompilerInvocation.cpp
===================================================================
--- clang/lib/Frontend/CompilerInvocation.cpp
+++ clang/lib/Frontend/CompilerInvocation.cpp
@@ -446,6 +446,23 @@
}
}
+static CodeGenOptions::XRayInstrumentationPointBundle
+parseXRayInstrumentationBundle(Arg *A, ArgList &Args, DiagnosticsEngine &D) {
+ StringRef V = A->getValue();
+ auto Bundle = llvm::StringSwitch<CodeGenOptions::XRayInstrumentationPointBundle>(V)
+ .Case("all", CodeGenOptions::XRayInstrumentationPointBundle::XRay_All)
+ .Case("none", CodeGenOptions::XRayInstrumentationPointBundle::XRay_None)
+ .Case("function-extents",
+ CodeGenOptions::XRayInstrumentationPointBundle::XRay_Function)
+ .Case("custom-only",
+ CodeGenOptions::XRayInstrumentationPointBundle::XRay_CustomOnly)
+ .Default(CodeGenOptions::XRayInstrumentationPointBundle::XRay_All);
+ if (Bundle == CodeGenOptions::XRayInstrumentationPointBundle::XRay_All &&
+ !V.empty() && V != "all")
+ D.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << V;
+ return Bundle;
+}
+
// Set the profile kind for fprofile-instrument.
static void setPGOInstrumentor(CodeGenOptions &Opts, ArgList &Args,
DiagnosticsEngine &Diags) {
@@ -821,11 +838,20 @@
Args.hasArg(OPT_finstrument_functions_after_inlining);
Opts.InstrumentFunctionEntryBare =
Args.hasArg(OPT_finstrument_function_entry_bare);
- Opts.XRayInstrumentFunctions = Args.hasArg(OPT_fxray_instrument);
Opts.XRayAlwaysEmitCustomEvents =
Args.hasArg(OPT_fxray_always_emit_customevents);
Opts.XRayInstructionThreshold =
getLastArgIntValue(Args, OPT_fxray_instruction_threshold_EQ, 200, Diags);
+
+ if (auto A = Args.getLastArg(OPT_fxray_instrumentation_bundle))
+ Opts.setXRayInstrumentationBundle(
+ parseXRayInstrumentationBundle(A, Args, Diags));
+
+ Opts.XRayInstrumentFunctions =
+ Args.hasArg(OPT_fxray_instrument) &&
+ Opts.getXRayInstrumentationBundle() !=
+ CodeGenOptions::XRayInstrumentationPointBundle::XRay_None;
+
Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
Opts.CallFEntry = Args.hasArg(OPT_mfentry);
Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
Index: clang/lib/Driver/XRayArgs.cpp
===================================================================
--- clang/lib/Driver/XRayArgs.cpp
+++ clang/lib/Driver/XRayArgs.cpp
@@ -27,6 +27,8 @@
constexpr char XRayInstrumentOption[] = "-fxray-instrument";
constexpr char XRayInstructionThresholdOption[] =
"-fxray-instruction-threshold=";
+constexpr char XRayInstrumentationBundleOption[] =
+ "-fxray-instrumentation-bundle=";
} // namespace
XRayArgs::XRayArgs(const ToolChain &TC, const ArgList &Args) {
@@ -50,10 +52,10 @@
<< (std::string(XRayInstrumentOption) + " on " + Triple.str());
}
} else if (Triple.getOS() == llvm::Triple::FreeBSD) {
- if (Triple.getArch() != llvm::Triple::x86_64) {
- D.Diag(diag::err_drv_clang_unsupported)
- << (std::string(XRayInstrumentOption) + " on " + Triple.str());
- }
+ if (Triple.getArch() != llvm::Triple::x86_64) {
+ D.Diag(diag::err_drv_clang_unsupported)
+ << (std::string(XRayInstrumentOption) + " on " + Triple.str());
+ }
} else {
D.Diag(diag::err_drv_clang_unsupported)
<< (std::string(XRayInstrumentOption) + " on non-supported target OS");
@@ -75,6 +77,23 @@
options::OPT_fnoxray_always_emit_customevents, false))
XRayAlwaysEmitCustomEvents = true;
+ // We check the bundle of instrumentation that we let users choose. This
+ // coarse grained control is used to determine which instrumentation points
+ // to actually emit.
+ if (const Arg *A =
+ Args.getLastArg(options::OPT_fxray_instrumentation_bundle)) {
+ StringRef Bundle = A->getValue();
+ XRayBundle = llvm::StringSwitch<StringRef>(Bundle)
+ .Case("all", "all")
+ .Case("none", "none")
+ .Case("function-extents", "function-extents")
+ .Case("custom-only", "custom-only")
+ .Default("error");
+ if (XRayBundle == "error")
+ D.Diag(clang::diag::err_drv_invalid_value)
+ << A->getAsString(Args) << Bundle;
+ }
+
// Validate the always/never attribute files. We also make sure that they
// are treated as actual dependencies.
for (const auto &Filename :
@@ -109,6 +128,8 @@
CmdArgs.push_back(Args.MakeArgString(Twine(XRayInstructionThresholdOption) +
Twine(InstructionThreshold)));
+ CmdArgs.push_back(Args.MakeArgString(Twine(XRayInstrumentationBundleOption) +
+ Twine(XRayBundle)));
for (const auto &Always : AlwaysInstrumentFiles) {
SmallString<64> AlwaysInstrumentOpt("-fxray-always-instrument=");
Index: clang/lib/CodeGen/CodeGenFunction.cpp
===================================================================
--- clang/lib/CodeGen/CodeGenFunction.cpp
+++ clang/lib/CodeGen/CodeGenFunction.cpp
@@ -468,7 +468,8 @@
/// AlwaysEmitXRayCustomEvents - Return true if we should emit IR for calls to
/// the __xray_customevent(...) builin calls, when doing XRay instrumentation.
bool CodeGenFunction::AlwaysEmitXRayCustomEvents() const {
- return CGM.getCodeGenOpts().XRayAlwaysEmitCustomEvents;
+ return CGM.getCodeGenOpts().XRayInstrumentFunctions &&
+ CGM.getCodeGenOpts().XRayAlwaysEmitCustomEvents;
}
llvm::Constant *
Index: clang/lib/CodeGen/CGBuiltin.cpp
===================================================================
--- clang/lib/CodeGen/CGBuiltin.cpp
+++ clang/lib/CodeGen/CGBuiltin.cpp
@@ -3245,6 +3245,15 @@
if (XRayAttr->neverXRayInstrument() && !AlwaysEmitXRayCustomEvents())
return RValue::getIgnored();
+ // Check first whether the bundle of XRay instrumentation includes this
+ // custom events.
+ auto XRayBundle = CGM.getCodeGenOpts().getXRayInstrumentationBundle();
+ if (XRayBundle ==
+ CodeGenOptions::XRayInstrumentationPointBundle::XRay_None ||
+ XRayBundle ==
+ CodeGenOptions::XRayInstrumentationPointBundle::XRay_Function)
+ return RValue::getIgnored();
+
Function *F = CGM.getIntrinsic(Intrinsic::xray_customevent);
auto FTy = F->getFunctionType();
auto Arg0 = E->getArg(0);
Index: clang/include/clang/Frontend/CodeGenOptions.h
===================================================================
--- clang/include/clang/Frontend/CodeGenOptions.h
+++ clang/include/clang/Frontend/CodeGenOptions.h
@@ -107,6 +107,14 @@
Embed_Marker // Embed a marker as a placeholder for bitcode.
};
+ enum XRayInstrumentationPointBundle {
+ XRay_All, // Always emit all the instrumentation points.
+ XRay_None, // Emit none of the instrumentation points.
+ XRay_Function, // Only emit function entry/exit instrumentation
+ // points.
+ XRay_CustomOnly, // Only emit custom event instrumentation points.
+ };
+
/// The code model to use (-mcmodel).
std::string CodeModel;
Index: clang/include/clang/Frontend/CodeGenOptions.def
===================================================================
--- clang/include/clang/Frontend/CodeGenOptions.def
+++ clang/include/clang/Frontend/CodeGenOptions.def
@@ -95,6 +95,10 @@
///< Set when -fxray-always-emit-customevents is enabled.
CODEGENOPT(XRayAlwaysEmitCustomEvents , 1, 0)
+///< Filter the instrumentation points we emit, to predefined groupings.
+ENUM_CODEGENOPT(XRayInstrumentationBundle, XRayInstrumentationPointBundle, 4,
+ XRayInstrumentationPointBundle::XRay_All)
+
///< Set the minimum number of instructions in a function to determine selective
///< XRay instrumentation.
VALUE_CODEGENOPT(XRayInstructionThreshold , 32, 200)
Index: clang/include/clang/Driver/XRayArgs.h
===================================================================
--- clang/include/clang/Driver/XRayArgs.h
+++ clang/include/clang/Driver/XRayArgs.h
@@ -25,6 +25,7 @@
bool XRayInstrument = false;
int InstructionThreshold = 200;
bool XRayAlwaysEmitCustomEvents = false;
+ std::string XRayBundle = "all";
public:
/// Parses the XRay arguments from an argument list.
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -1107,6 +1107,10 @@
def fnoxray_always_emit_customevents : Flag<["-"], "fno-xray-always-emit-customevents">, Group<f_Group>,
Flags<[CC1Option]>;
+def fxray_instrumentation_bundle : Joined<["-"], "fxray-instrumentation-bundle=">,
+ Group<f_Group>, Flags<[CC1Option]>,
+ HelpText<"Select which bundle of XRay instrumentation points to emit. Options: all, none, function-extents, custom-only.">;
+
def ffine_grained_bitfield_accesses : Flag<["-"],
"ffine-grained-bitfield-accesses">, Group<f_clang_Group>, Flags<[CC1Option]>,
HelpText<"Use separate accesses for bitfields with legal widths and alignments.">;
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