[sanitizer] Parse weighted sanitizer args and -fsanitize-skip-hot-cutoff #121619
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This adds a function to parse weighted sanitizer flags (e.g., -fsanitize-blah=undefined=0.5,null=0.3) and adds the plumbing to apply that to -fno-sanitize-top-hot from the frontend to backend. -fno-sanitize-top-hot currently has no effect; future work will use it to generalize ubsan-guard-checks (originaly introduced in 5f9ed2f).
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✅ With the latest revision this PR passed the C/C++ code formatter. |
Update clang driver test
vitalybuka
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vitalybuka
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@llvm/pr-subscribers-clang-driver Author: Thurston Dang (thurstond) ChangesThis adds a function to parse weighted sanitizer flags (e.g., -fsanitize-blah=undefined=0.5,null=0.3) and adds the plumbing to apply that to a new flag, -fno-sanitize-top-hot, from the frontend to backend. -fno-sanitize-top-hot currently has no effect; future work will use it to generalize ubsan-guard-checks (originaly introduced in 5f9ed2f). Patch is 22.58 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/121619.diff 9 Files Affected:
diff --git a/clang/include/clang/Basic/CodeGenOptions.h b/clang/include/clang/Basic/CodeGenOptions.h
index 8097c9ef772bc7..227bddf831002e 100644
--- a/clang/include/clang/Basic/CodeGenOptions.h
+++ b/clang/include/clang/Basic/CodeGenOptions.h
@@ -384,6 +384,14 @@ class CodeGenOptions : public CodeGenOptionsBase {
/// the expense of debuggability).
SanitizerSet SanitizeMergeHandlers;
+ /// Set of thresholds: the top hottest code responsible for the given
+ /// fraction of PGO counters will be excluded from sanitization
+ /// (0.0 [default] = skip none, 1.0 = skip all).
+ SanitizerSet NoSanitizeTopHot;
+ /// N.B. The cutoffs contain strictly more information than the SanitizerSet,
+ /// but the SanitizerSet is more efficient for some calculations.
+ SanitizerMaskCutoffs NoSanitizeTopHotCutoffs = {0};
+
/// List of backend command-line options for -fembed-bitcode.
std::vector<uint8_t> CmdArgs;
diff --git a/clang/include/clang/Basic/Sanitizers.h b/clang/include/clang/Basic/Sanitizers.h
index c890242269b334..12c2c93a7f89f6 100644
--- a/clang/include/clang/Basic/Sanitizers.h
+++ b/clang/include/clang/Basic/Sanitizers.h
@@ -154,6 +154,8 @@ struct SanitizerKind {
#include "clang/Basic/Sanitizers.def"
}; // SanitizerKind
+using SanitizerMaskCutoffs = std::array<float, SanitizerKind::SO_Count>;
+
struct SanitizerSet {
/// Check if a certain (single) sanitizer is enabled.
bool has(SanitizerMask K) const {
@@ -186,10 +188,24 @@ struct SanitizerSet {
/// Returns a non-zero SanitizerMask, or \c 0 if \p Value is not known.
SanitizerMask parseSanitizerValue(StringRef Value, bool AllowGroups);
+/// Parse a single weighted value (e.g., 'undefined=0.05') from a -fsanitize= or
+/// -fno-sanitize= value list.
+/// Returns a non-zero SanitizerMask, or \c 0 if \p Value is not known.
+/// The relevant weight(s) are updated in the passed array.
+/// Individual Cutoffs are never reset to zero unless explicitly set
+/// (e.g., 'null=0.0').
+SanitizerMask parseSanitizerWeightedValue(StringRef Value, bool AllowGroups,
+ SanitizerMaskCutoffs *Cutoffs);
+
/// Serialize a SanitizerSet into values for -fsanitize= or -fno-sanitize=.
void serializeSanitizerSet(SanitizerSet Set,
SmallVectorImpl<StringRef> &Values);
+/// Serialize a SanitizerMaskCutoffs into values for -fsanitize= or
+/// -fno-sanitize=.
+void serializeSanitizerMaskCutoffs(const SanitizerMaskCutoffs Cutoffs,
+ SmallVectorImpl<std::string> &Values);
+
/// For each sanitizer group bit set in \p Kinds, set the bits for sanitizers
/// this group enables.
SanitizerMask expandSanitizerGroups(SanitizerMask Kinds);
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index d922709db17786..027093157d4c73 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -2649,6 +2649,13 @@ def fsanitize_undefined_strip_path_components_EQ : Joined<["-"], "fsanitize-unde
HelpText<"Strip (or keep only, if negative) a given number of path components "
"when emitting check metadata.">,
MarshallingInfoInt<CodeGenOpts<"EmitCheckPathComponentsToStrip">, "0", "int">;
+def fno_sanitize_top_hot_EQ
+ : CommaJoined<["-"], "fno-sanitize-top-hot=">,
+ Group<f_clang_Group>,
+ HelpText<"Exclude sanitization for the top hottest code responsible for "
+ "the given fraction of PGO counters "
+ "(0.0 [default] = skip none; 1.0 = skip all). "
+ "Argument format: <sanitizer1>=,<sanitizer2>=,...">;
} // end -f[no-]sanitize* flags
diff --git a/clang/include/clang/Driver/SanitizerArgs.h b/clang/include/clang/Driver/SanitizerArgs.h
index 3b275092bbbe86..2462228f533746 100644
--- a/clang/include/clang/Driver/SanitizerArgs.h
+++ b/clang/include/clang/Driver/SanitizerArgs.h
@@ -26,6 +26,8 @@ class SanitizerArgs {
SanitizerSet RecoverableSanitizers;
SanitizerSet TrapSanitizers;
SanitizerSet MergeHandlers;
+ SanitizerSet TopHot;
+ SanitizerMaskCutoffs TopHotCutoffs = {0};
std::vector<std::string> UserIgnorelistFiles;
std::vector<std::string> SystemIgnorelistFiles;
diff --git a/clang/lib/Basic/Sanitizers.cpp b/clang/lib/Basic/Sanitizers.cpp
index 62ccdf8e9bbf28..6711b05c4539dd 100644
--- a/clang/lib/Basic/Sanitizers.cpp
+++ b/clang/lib/Basic/Sanitizers.cpp
@@ -36,6 +36,37 @@ SanitizerMask clang::parseSanitizerValue(StringRef Value, bool AllowGroups) {
return ParsedKind;
}
+SanitizerMask
+clang::parseSanitizerWeightedValue(StringRef Value, bool AllowGroups,
+ SanitizerMaskCutoffs *Cutoffs) {
+ SanitizerMask ParsedKind = llvm::StringSwitch<SanitizerMask>(Value)
+#define SANITIZER(NAME, ID) .StartsWith(NAME "=", SanitizerKind::ID)
+#define SANITIZER_GROUP(NAME, ID, ALIAS) \
+ .StartsWith(NAME "=", \
+ AllowGroups ? SanitizerKind::ID##Group : SanitizerMask())
+#include "clang/Basic/Sanitizers.def"
+ .Default(SanitizerMask());
+
+ if (ParsedKind && Cutoffs) {
+ size_t equalsIndex = Value.find_first_of('=');
+ if (equalsIndex != llvm::StringLiteral::npos) {
+ double arg;
+ if ((Value.size() > (equalsIndex + 1)) &&
+ !Value.substr(equalsIndex + 1).getAsDouble(arg)) {
+ // AllowGroups is already taken into account for ParsedKind,
+ // hence we unconditionally expandSanitizerGroups.
+ SanitizerMask ExpandedKind = expandSanitizerGroups(ParsedKind);
+
+ for (unsigned int i = 0; i < SanitizerKind::SO_Count; i++)
+ if (ExpandedKind & SanitizerMask::bitPosToMask(i))
+ (*Cutoffs)[i] = arg;
+ }
+ }
+ }
+
+ return ParsedKind;
+}
+
void clang::serializeSanitizerSet(SanitizerSet Set,
SmallVectorImpl<StringRef> &Values) {
#define SANITIZER(NAME, ID) \
@@ -44,6 +75,15 @@ void clang::serializeSanitizerSet(SanitizerSet Set,
#include "clang/Basic/Sanitizers.def"
}
+void clang::serializeSanitizerMaskCutoffs(
+ const SanitizerMaskCutoffs Cutoffs, SmallVectorImpl<std::string> &Values) {
+#define SANITIZER(NAME, ID) \
+ if (Cutoffs[SanitizerKind::SO_##ID]) \
+ Values.push_back(std::string(NAME "=") + \
+ std::to_string(Cutoffs[SanitizerKind::SO_##ID]));
+#include "clang/Basic/Sanitizers.def"
+}
+
SanitizerMask clang::expandSanitizerGroups(SanitizerMask Kinds) {
#define SANITIZER(NAME, ID)
#define SANITIZER_GROUP(NAME, ID, ALIAS) \
diff --git a/clang/lib/Driver/SanitizerArgs.cpp b/clang/lib/Driver/SanitizerArgs.cpp
index 98116e2c8336b8..f7db3e5032ce1a 100644
--- a/clang/lib/Driver/SanitizerArgs.cpp
+++ b/clang/lib/Driver/SanitizerArgs.cpp
@@ -111,7 +111,8 @@ enum BinaryMetadataFeature {
/// Parse a -fsanitize= or -fno-sanitize= argument's values, diagnosing any
/// invalid components. Returns a SanitizerMask.
static SanitizerMask parseArgValues(const Driver &D, const llvm::opt::Arg *A,
- bool DiagnoseErrors);
+ bool DiagnoseErrors,
+ SanitizerMaskCutoffs *Cutoffs);
/// Parse -f(no-)?sanitize-coverage= flag values, diagnosing any invalid
/// components. Returns OR of members of \c CoverageFeature enumeration.
@@ -260,7 +261,7 @@ static SanitizerMask
parseSanitizeArgs(const Driver &D, const llvm::opt::ArgList &Args,
bool DiagnoseErrors, SanitizerMask Default,
SanitizerMask AlwaysIn, SanitizerMask AlwaysOut, int OptInID,
- int OptOutID) {
+ int OptOutID, SanitizerMaskCutoffs *Cutoffs) {
assert(!(AlwaysIn & AlwaysOut) &&
"parseSanitizeArgs called with contradictory in/out requirements");
@@ -271,7 +272,7 @@ parseSanitizeArgs(const Driver &D, const llvm::opt::ArgList &Args,
SanitizerMask DiagnosedAlwaysOutViolations;
for (const auto *Arg : Args) {
if (Arg->getOption().matches(OptInID)) {
- SanitizerMask Add = parseArgValues(D, Arg, DiagnoseErrors);
+ SanitizerMask Add = parseArgValues(D, Arg, DiagnoseErrors, Cutoffs);
// Report error if user explicitly tries to opt-in to an always-out
// sanitizer.
if (SanitizerMask KindsToDiagnose =
@@ -287,7 +288,7 @@ parseSanitizeArgs(const Driver &D, const llvm::opt::ArgList &Args,
Output |= expandSanitizerGroups(Add);
Arg->claim();
} else if (Arg->getOption().matches(OptOutID)) {
- SanitizerMask Remove = parseArgValues(D, Arg, DiagnoseErrors);
+ SanitizerMask Remove = parseArgValues(D, Arg, DiagnoseErrors, Cutoffs);
// Report error if user explicitly tries to opt-out of an always-in
// sanitizer.
if (SanitizerMask KindsToDiagnose =
@@ -320,7 +321,15 @@ static SanitizerMask parseSanitizeTrapArgs(const Driver &D,
// (not even in recover mode) in order to avoid the need for a ubsan runtime.
return parseSanitizeArgs(D, Args, DiagnoseErrors, TrappingDefault, AlwaysTrap,
NeverTrap, options::OPT_fsanitize_trap_EQ,
- options::OPT_fno_sanitize_trap_EQ);
+ options::OPT_fno_sanitize_trap_EQ, nullptr);
+}
+
+static SanitizerMask parseNoSanitizeHotArgs(const Driver &D,
+ const llvm::opt::ArgList &Args,
+ bool DiagnoseErrors,
+ SanitizerMaskCutoffs *Cutoffs) {
+ return parseSanitizeArgs(D, Args, DiagnoseErrors, {}, {}, {},
+ options::OPT_fno_sanitize_top_hot_EQ, -1, Cutoffs);
}
bool SanitizerArgs::needsFuzzerInterceptors() const {
@@ -403,7 +412,7 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
for (const llvm::opt::Arg *Arg : llvm::reverse(Args)) {
if (Arg->getOption().matches(options::OPT_fsanitize_EQ)) {
Arg->claim();
- SanitizerMask Add = parseArgValues(D, Arg, DiagnoseErrors);
+ SanitizerMask Add = parseArgValues(D, Arg, DiagnoseErrors, nullptr);
if (RemoveObjectSizeAtO0) {
AllRemove |= SanitizerKind::ObjectSize;
@@ -573,7 +582,7 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
Kinds |= Add;
} else if (Arg->getOption().matches(options::OPT_fno_sanitize_EQ)) {
Arg->claim();
- SanitizerMask Remove = parseArgValues(D, Arg, DiagnoseErrors);
+ SanitizerMask Remove = parseArgValues(D, Arg, DiagnoseErrors, nullptr);
AllRemove |= expandSanitizerGroups(Remove);
}
}
@@ -698,7 +707,7 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
SanitizerMask RecoverableKinds = parseSanitizeArgs(
D, Args, DiagnoseErrors, RecoverableByDefault, AlwaysRecoverable,
Unrecoverable, options::OPT_fsanitize_recover_EQ,
- options::OPT_fno_sanitize_recover_EQ);
+ options::OPT_fno_sanitize_recover_EQ, nullptr);
RecoverableKinds |= AlwaysRecoverable;
RecoverableKinds &= ~Unrecoverable;
RecoverableKinds &= Kinds;
@@ -710,9 +719,14 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
SanitizerMask MergeKinds =
parseSanitizeArgs(D, Args, DiagnoseErrors, MergeDefault, {}, {},
options::OPT_fsanitize_merge_handlers_EQ,
- options::OPT_fno_sanitize_merge_handlers_EQ);
+ options::OPT_fno_sanitize_merge_handlers_EQ, nullptr);
MergeKinds &= Kinds;
+ // Parse -fno-sanitize-top-hot flags
+ SanitizerMask TopHotMask =
+ parseNoSanitizeHotArgs(D, Args, DiagnoseErrors, &TopHotCutoffs);
+ (void)TopHotMask;
+
// Setup ignorelist files.
// Add default ignorelist from resource directory for activated sanitizers,
// and validate special case lists format.
@@ -1132,6 +1146,15 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
"Overlap between recoverable and trapping sanitizers");
MergeHandlers.Mask |= MergeKinds;
+
+ TopHotMask &= Sanitizers.Mask;
+ TopHot.Mask = TopHotMask;
+
+ // Zero out TopHot for unused sanitizers
+ for (unsigned int i = 0; i < SanitizerKind::SO_Count; i++) {
+ if (!(Sanitizers.Mask & SanitizerMask::bitPosToMask(i)))
+ TopHotCutoffs[i] = 0;
+ }
}
static std::string toString(const clang::SanitizerSet &Sanitizers) {
@@ -1146,6 +1169,19 @@ static std::string toString(const clang::SanitizerSet &Sanitizers) {
return Res;
}
+static std::string toString(const clang::SanitizerMaskCutoffs &Cutoffs) {
+ std::string Res;
+#define SANITIZER(NAME, ID) \
+ if (Cutoffs[SanitizerKind::SO_##ID]) { \
+ if (!Res.empty()) \
+ Res += ","; \
+ Res += std::string(NAME) + "=" + \
+ std::to_string(Cutoffs[SanitizerKind::SO_##ID]); \
+ }
+#include "clang/Basic/Sanitizers.def"
+ return Res;
+}
+
static void addSpecialCaseListOpt(const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs,
const char *SCLOptFlag,
@@ -1297,6 +1333,11 @@ void SanitizerArgs::addArgs(const ToolChain &TC, const llvm::opt::ArgList &Args,
CmdArgs.push_back(
Args.MakeArgString("-fsanitize-merge=" + toString(MergeHandlers)));
+ std::string TopHotCutoffsStr = toString(TopHotCutoffs);
+ if (TopHotCutoffsStr != "")
+ CmdArgs.push_back(
+ Args.MakeArgString("-fno-sanitize-top-hot=" + TopHotCutoffsStr));
+
addSpecialCaseListOpt(Args, CmdArgs,
"-fsanitize-ignorelist=", UserIgnorelistFiles);
addSpecialCaseListOpt(Args, CmdArgs,
@@ -1463,17 +1504,18 @@ void SanitizerArgs::addArgs(const ToolChain &TC, const llvm::opt::ArgList &Args,
}
SanitizerMask parseArgValues(const Driver &D, const llvm::opt::Arg *A,
- bool DiagnoseErrors) {
- assert(
- (A->getOption().matches(options::OPT_fsanitize_EQ) ||
- A->getOption().matches(options::OPT_fno_sanitize_EQ) ||
- A->getOption().matches(options::OPT_fsanitize_recover_EQ) ||
- A->getOption().matches(options::OPT_fno_sanitize_recover_EQ) ||
- A->getOption().matches(options::OPT_fsanitize_trap_EQ) ||
- A->getOption().matches(options::OPT_fno_sanitize_trap_EQ) ||
- A->getOption().matches(options::OPT_fsanitize_merge_handlers_EQ) ||
- A->getOption().matches(options::OPT_fno_sanitize_merge_handlers_EQ)) &&
- "Invalid argument in parseArgValues!");
+ bool DiagnoseErrors,
+ SanitizerMaskCutoffs *Cutoffs) {
+ assert((A->getOption().matches(options::OPT_fsanitize_EQ) ||
+ A->getOption().matches(options::OPT_fno_sanitize_EQ) ||
+ A->getOption().matches(options::OPT_fsanitize_recover_EQ) ||
+ A->getOption().matches(options::OPT_fno_sanitize_recover_EQ) ||
+ A->getOption().matches(options::OPT_fsanitize_trap_EQ) ||
+ A->getOption().matches(options::OPT_fno_sanitize_trap_EQ) ||
+ A->getOption().matches(options::OPT_fsanitize_merge_handlers_EQ) ||
+ A->getOption().matches(options::OPT_fno_sanitize_merge_handlers_EQ) ||
+ A->getOption().matches(options::OPT_fno_sanitize_top_hot_EQ)) &&
+ "Invalid argument in parseArgValues!");
SanitizerMask Kinds;
for (int i = 0, n = A->getNumValues(); i != n; ++i) {
const char *Value = A->getValue(i);
@@ -1482,8 +1524,15 @@ SanitizerMask parseArgValues(const Driver &D, const llvm::opt::Arg *A,
if (A->getOption().matches(options::OPT_fsanitize_EQ) &&
0 == strcmp("all", Value))
Kind = SanitizerMask();
- else
+ else if (A->getOption().matches(options::OPT_fno_sanitize_top_hot_EQ)) {
+ assert(
+ Cutoffs &&
+ "Null Cutoffs parameter provided for parsing fno_sanitize_top_hot!");
+ Kind = parseSanitizerWeightedValue(Value, /*AllowGroups=*/true, Cutoffs);
+ } else {
+ assert((!Cutoffs) && "Non-null Cutoffs parameter erroneously provided!");
Kind = parseSanitizerValue(Value, /*AllowGroups=*/true);
+ }
if (Kind)
Kinds |= Kind;
@@ -1586,12 +1635,12 @@ std::string lastArgumentForMask(const Driver &D, const llvm::opt::ArgList &Args,
const auto *Arg = *I;
if (Arg->getOption().matches(options::OPT_fsanitize_EQ)) {
SanitizerMask AddKinds =
- expandSanitizerGroups(parseArgValues(D, Arg, false));
+ expandSanitizerGroups(parseArgValues(D, Arg, false, nullptr));
if (AddKinds & Mask)
return describeSanitizeArg(Arg, Mask);
} else if (Arg->getOption().matches(options::OPT_fno_sanitize_EQ)) {
SanitizerMask RemoveKinds =
- expandSanitizerGroups(parseArgValues(D, Arg, false));
+ expandSanitizerGroups(parseArgValues(D, Arg, false, nullptr));
Mask &= ~RemoveKinds;
}
}
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 348c56cc37da3f..78dd5099259f18 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -1436,6 +1436,19 @@ static SmallVector<StringRef, 4> serializeSanitizerKinds(SanitizerSet S) {
return Values;
}
+static void parseSanitizerWeightedKinds(
+ StringRef FlagName, const std::vector<std::string> &Sanitizers,
+ DiagnosticsEngine &Diags, SanitizerSet &S, SanitizerMaskCutoffs *Cutoffs) {
+ for (const auto &Sanitizer : Sanitizers) {
+ SanitizerMask K =
+ parseSanitizerWeightedValue(Sanitizer, /*AllowGroups=*/false, Cutoffs);
+ if (K == SanitizerMask())
+ Diags.Report(diag::err_drv_invalid_value) << FlagName << Sanitizer;
+ else
+ S.set(K, true);
+ }
+}
+
static void parseXRayInstrumentationBundle(StringRef FlagName, StringRef Bundle,
ArgList &Args, DiagnosticsEngine &D,
XRayInstrSet &S) {
@@ -1796,6 +1809,11 @@ void CompilerInvocationBase::GenerateCodeGenArgs(const CodeGenOptions &Opts,
serializeSanitizerKinds(Opts.SanitizeMergeHandlers))
GenerateArg(Consumer, OPT_fsanitize_merge_handlers_EQ, Sanitizer);
+ SmallVector<std::string, 4> Values;
+ serializeSanitizerMaskCutoffs(Opts.NoSanitizeTopHotCutoffs, Values);
+ for (std::string Sanitizer : Values)
+ GenerateArg(Consumer, OPT_fno_sanitize_top_hot_EQ, Sanitizer);
+
if (!Opts.EmitVersionIdentMetadata)
GenerateArg(Consumer, OPT_Qn);
@@ -2277,6 +2295,12 @@ bool CompilerInvocation::ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args,
Args.getAllArgValues(OPT_fsanitize_merge_handlers_EQ),
Diags, Opts.SanitizeMergeHandlers);
+ // Parse -fno-sanitize-top-hot= arguments.
+ parseSanitizerWeightedKinds("-fno-sanitize-top-hot=",
+ Args.getAllArgValues(OPT_fno_sanitize_top_hot_EQ),
+ Diags, Opts.NoSanitizeTopHot,
+ &Opts.NoSanitizeTopHotCutoffs);
+
Opts.EmitVersionIdentMetadata = Args.hasFlag(OPT_Qy, OPT_Qn, true);
if (!LangOpts->CUDAIsDevice)
diff --git a/clang/test/CodeGen/allow-ubsan-check.c b/clang/test/CodeGen/allow-ubsan-check.c
index 5232d240854666..1c76049b57bda8 100644
--- a/clang/test/CodeGen/allow-ubsan-check.c
+++ b/clang/test/CodeGen/allow-ubsan-check.c
@@ -3,7 +3,6 @@
// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -emit-llvm -o - %s -fsanitize=signed-integer-overflow,integer-divide-by-zero,null -mllvm -ubsan-guard-checks -fsanitize-trap=signed-integer-overflow,integer-divide-by-zero,null | FileCheck %s --check-prefixes=TRAP
// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -emit-llvm -o - %s -fsanitize=signed-integer-overflow,integer-divide-by-zero,null -mllvm -ubsan-guard-checks -fsanitize-recover=signed-integer-overflow,integer-divide-by-zero,null | FileCheck %s --check-prefixes=RECOVER
-
// CHECK-LABEL: define dso_local i32 @d...
[truncated]
|
|
@llvm/pr-subscribers-clang Author: Thurston Dang (thurstond) ChangesThis adds a function to parse weighted sanitizer flags (e.g., -fsanitize-blah=undefined=0.5,null=0.3) and adds the plumbing to apply that to a new flag, -fno-sanitize-top-hot, from the frontend to backend. -fno-sanitize-top-hot currently has no effect; future work will use it to generalize ubsan-guard-checks (originaly introduced in 5f9ed2f). Patch is 22.58 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/121619.diff 9 Files Affected:
diff --git a/clang/include/clang/Basic/CodeGenOptions.h b/clang/include/clang/Basic/CodeGenOptions.h
index 8097c9ef772bc7..227bddf831002e 100644
--- a/clang/include/clang/Basic/CodeGenOptions.h
+++ b/clang/include/clang/Basic/CodeGenOptions.h
@@ -384,6 +384,14 @@ class CodeGenOptions : public CodeGenOptionsBase {
/// the expense of debuggability).
SanitizerSet SanitizeMergeHandlers;
+ /// Set of thresholds: the top hottest code responsible for the given
+ /// fraction of PGO counters will be excluded from sanitization
+ /// (0.0 [default] = skip none, 1.0 = skip all).
+ SanitizerSet NoSanitizeTopHot;
+ /// N.B. The cutoffs contain strictly more information than the SanitizerSet,
+ /// but the SanitizerSet is more efficient for some calculations.
+ SanitizerMaskCutoffs NoSanitizeTopHotCutoffs = {0};
+
/// List of backend command-line options for -fembed-bitcode.
std::vector<uint8_t> CmdArgs;
diff --git a/clang/include/clang/Basic/Sanitizers.h b/clang/include/clang/Basic/Sanitizers.h
index c890242269b334..12c2c93a7f89f6 100644
--- a/clang/include/clang/Basic/Sanitizers.h
+++ b/clang/include/clang/Basic/Sanitizers.h
@@ -154,6 +154,8 @@ struct SanitizerKind {
#include "clang/Basic/Sanitizers.def"
}; // SanitizerKind
+using SanitizerMaskCutoffs = std::array<float, SanitizerKind::SO_Count>;
+
struct SanitizerSet {
/// Check if a certain (single) sanitizer is enabled.
bool has(SanitizerMask K) const {
@@ -186,10 +188,24 @@ struct SanitizerSet {
/// Returns a non-zero SanitizerMask, or \c 0 if \p Value is not known.
SanitizerMask parseSanitizerValue(StringRef Value, bool AllowGroups);
+/// Parse a single weighted value (e.g., 'undefined=0.05') from a -fsanitize= or
+/// -fno-sanitize= value list.
+/// Returns a non-zero SanitizerMask, or \c 0 if \p Value is not known.
+/// The relevant weight(s) are updated in the passed array.
+/// Individual Cutoffs are never reset to zero unless explicitly set
+/// (e.g., 'null=0.0').
+SanitizerMask parseSanitizerWeightedValue(StringRef Value, bool AllowGroups,
+ SanitizerMaskCutoffs *Cutoffs);
+
/// Serialize a SanitizerSet into values for -fsanitize= or -fno-sanitize=.
void serializeSanitizerSet(SanitizerSet Set,
SmallVectorImpl<StringRef> &Values);
+/// Serialize a SanitizerMaskCutoffs into values for -fsanitize= or
+/// -fno-sanitize=.
+void serializeSanitizerMaskCutoffs(const SanitizerMaskCutoffs Cutoffs,
+ SmallVectorImpl<std::string> &Values);
+
/// For each sanitizer group bit set in \p Kinds, set the bits for sanitizers
/// this group enables.
SanitizerMask expandSanitizerGroups(SanitizerMask Kinds);
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index d922709db17786..027093157d4c73 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -2649,6 +2649,13 @@ def fsanitize_undefined_strip_path_components_EQ : Joined<["-"], "fsanitize-unde
HelpText<"Strip (or keep only, if negative) a given number of path components "
"when emitting check metadata.">,
MarshallingInfoInt<CodeGenOpts<"EmitCheckPathComponentsToStrip">, "0", "int">;
+def fno_sanitize_top_hot_EQ
+ : CommaJoined<["-"], "fno-sanitize-top-hot=">,
+ Group<f_clang_Group>,
+ HelpText<"Exclude sanitization for the top hottest code responsible for "
+ "the given fraction of PGO counters "
+ "(0.0 [default] = skip none; 1.0 = skip all). "
+ "Argument format: <sanitizer1>=,<sanitizer2>=,...">;
} // end -f[no-]sanitize* flags
diff --git a/clang/include/clang/Driver/SanitizerArgs.h b/clang/include/clang/Driver/SanitizerArgs.h
index 3b275092bbbe86..2462228f533746 100644
--- a/clang/include/clang/Driver/SanitizerArgs.h
+++ b/clang/include/clang/Driver/SanitizerArgs.h
@@ -26,6 +26,8 @@ class SanitizerArgs {
SanitizerSet RecoverableSanitizers;
SanitizerSet TrapSanitizers;
SanitizerSet MergeHandlers;
+ SanitizerSet TopHot;
+ SanitizerMaskCutoffs TopHotCutoffs = {0};
std::vector<std::string> UserIgnorelistFiles;
std::vector<std::string> SystemIgnorelistFiles;
diff --git a/clang/lib/Basic/Sanitizers.cpp b/clang/lib/Basic/Sanitizers.cpp
index 62ccdf8e9bbf28..6711b05c4539dd 100644
--- a/clang/lib/Basic/Sanitizers.cpp
+++ b/clang/lib/Basic/Sanitizers.cpp
@@ -36,6 +36,37 @@ SanitizerMask clang::parseSanitizerValue(StringRef Value, bool AllowGroups) {
return ParsedKind;
}
+SanitizerMask
+clang::parseSanitizerWeightedValue(StringRef Value, bool AllowGroups,
+ SanitizerMaskCutoffs *Cutoffs) {
+ SanitizerMask ParsedKind = llvm::StringSwitch<SanitizerMask>(Value)
+#define SANITIZER(NAME, ID) .StartsWith(NAME "=", SanitizerKind::ID)
+#define SANITIZER_GROUP(NAME, ID, ALIAS) \
+ .StartsWith(NAME "=", \
+ AllowGroups ? SanitizerKind::ID##Group : SanitizerMask())
+#include "clang/Basic/Sanitizers.def"
+ .Default(SanitizerMask());
+
+ if (ParsedKind && Cutoffs) {
+ size_t equalsIndex = Value.find_first_of('=');
+ if (equalsIndex != llvm::StringLiteral::npos) {
+ double arg;
+ if ((Value.size() > (equalsIndex + 1)) &&
+ !Value.substr(equalsIndex + 1).getAsDouble(arg)) {
+ // AllowGroups is already taken into account for ParsedKind,
+ // hence we unconditionally expandSanitizerGroups.
+ SanitizerMask ExpandedKind = expandSanitizerGroups(ParsedKind);
+
+ for (unsigned int i = 0; i < SanitizerKind::SO_Count; i++)
+ if (ExpandedKind & SanitizerMask::bitPosToMask(i))
+ (*Cutoffs)[i] = arg;
+ }
+ }
+ }
+
+ return ParsedKind;
+}
+
void clang::serializeSanitizerSet(SanitizerSet Set,
SmallVectorImpl<StringRef> &Values) {
#define SANITIZER(NAME, ID) \
@@ -44,6 +75,15 @@ void clang::serializeSanitizerSet(SanitizerSet Set,
#include "clang/Basic/Sanitizers.def"
}
+void clang::serializeSanitizerMaskCutoffs(
+ const SanitizerMaskCutoffs Cutoffs, SmallVectorImpl<std::string> &Values) {
+#define SANITIZER(NAME, ID) \
+ if (Cutoffs[SanitizerKind::SO_##ID]) \
+ Values.push_back(std::string(NAME "=") + \
+ std::to_string(Cutoffs[SanitizerKind::SO_##ID]));
+#include "clang/Basic/Sanitizers.def"
+}
+
SanitizerMask clang::expandSanitizerGroups(SanitizerMask Kinds) {
#define SANITIZER(NAME, ID)
#define SANITIZER_GROUP(NAME, ID, ALIAS) \
diff --git a/clang/lib/Driver/SanitizerArgs.cpp b/clang/lib/Driver/SanitizerArgs.cpp
index 98116e2c8336b8..f7db3e5032ce1a 100644
--- a/clang/lib/Driver/SanitizerArgs.cpp
+++ b/clang/lib/Driver/SanitizerArgs.cpp
@@ -111,7 +111,8 @@ enum BinaryMetadataFeature {
/// Parse a -fsanitize= or -fno-sanitize= argument's values, diagnosing any
/// invalid components. Returns a SanitizerMask.
static SanitizerMask parseArgValues(const Driver &D, const llvm::opt::Arg *A,
- bool DiagnoseErrors);
+ bool DiagnoseErrors,
+ SanitizerMaskCutoffs *Cutoffs);
/// Parse -f(no-)?sanitize-coverage= flag values, diagnosing any invalid
/// components. Returns OR of members of \c CoverageFeature enumeration.
@@ -260,7 +261,7 @@ static SanitizerMask
parseSanitizeArgs(const Driver &D, const llvm::opt::ArgList &Args,
bool DiagnoseErrors, SanitizerMask Default,
SanitizerMask AlwaysIn, SanitizerMask AlwaysOut, int OptInID,
- int OptOutID) {
+ int OptOutID, SanitizerMaskCutoffs *Cutoffs) {
assert(!(AlwaysIn & AlwaysOut) &&
"parseSanitizeArgs called with contradictory in/out requirements");
@@ -271,7 +272,7 @@ parseSanitizeArgs(const Driver &D, const llvm::opt::ArgList &Args,
SanitizerMask DiagnosedAlwaysOutViolations;
for (const auto *Arg : Args) {
if (Arg->getOption().matches(OptInID)) {
- SanitizerMask Add = parseArgValues(D, Arg, DiagnoseErrors);
+ SanitizerMask Add = parseArgValues(D, Arg, DiagnoseErrors, Cutoffs);
// Report error if user explicitly tries to opt-in to an always-out
// sanitizer.
if (SanitizerMask KindsToDiagnose =
@@ -287,7 +288,7 @@ parseSanitizeArgs(const Driver &D, const llvm::opt::ArgList &Args,
Output |= expandSanitizerGroups(Add);
Arg->claim();
} else if (Arg->getOption().matches(OptOutID)) {
- SanitizerMask Remove = parseArgValues(D, Arg, DiagnoseErrors);
+ SanitizerMask Remove = parseArgValues(D, Arg, DiagnoseErrors, Cutoffs);
// Report error if user explicitly tries to opt-out of an always-in
// sanitizer.
if (SanitizerMask KindsToDiagnose =
@@ -320,7 +321,15 @@ static SanitizerMask parseSanitizeTrapArgs(const Driver &D,
// (not even in recover mode) in order to avoid the need for a ubsan runtime.
return parseSanitizeArgs(D, Args, DiagnoseErrors, TrappingDefault, AlwaysTrap,
NeverTrap, options::OPT_fsanitize_trap_EQ,
- options::OPT_fno_sanitize_trap_EQ);
+ options::OPT_fno_sanitize_trap_EQ, nullptr);
+}
+
+static SanitizerMask parseNoSanitizeHotArgs(const Driver &D,
+ const llvm::opt::ArgList &Args,
+ bool DiagnoseErrors,
+ SanitizerMaskCutoffs *Cutoffs) {
+ return parseSanitizeArgs(D, Args, DiagnoseErrors, {}, {}, {},
+ options::OPT_fno_sanitize_top_hot_EQ, -1, Cutoffs);
}
bool SanitizerArgs::needsFuzzerInterceptors() const {
@@ -403,7 +412,7 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
for (const llvm::opt::Arg *Arg : llvm::reverse(Args)) {
if (Arg->getOption().matches(options::OPT_fsanitize_EQ)) {
Arg->claim();
- SanitizerMask Add = parseArgValues(D, Arg, DiagnoseErrors);
+ SanitizerMask Add = parseArgValues(D, Arg, DiagnoseErrors, nullptr);
if (RemoveObjectSizeAtO0) {
AllRemove |= SanitizerKind::ObjectSize;
@@ -573,7 +582,7 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
Kinds |= Add;
} else if (Arg->getOption().matches(options::OPT_fno_sanitize_EQ)) {
Arg->claim();
- SanitizerMask Remove = parseArgValues(D, Arg, DiagnoseErrors);
+ SanitizerMask Remove = parseArgValues(D, Arg, DiagnoseErrors, nullptr);
AllRemove |= expandSanitizerGroups(Remove);
}
}
@@ -698,7 +707,7 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
SanitizerMask RecoverableKinds = parseSanitizeArgs(
D, Args, DiagnoseErrors, RecoverableByDefault, AlwaysRecoverable,
Unrecoverable, options::OPT_fsanitize_recover_EQ,
- options::OPT_fno_sanitize_recover_EQ);
+ options::OPT_fno_sanitize_recover_EQ, nullptr);
RecoverableKinds |= AlwaysRecoverable;
RecoverableKinds &= ~Unrecoverable;
RecoverableKinds &= Kinds;
@@ -710,9 +719,14 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
SanitizerMask MergeKinds =
parseSanitizeArgs(D, Args, DiagnoseErrors, MergeDefault, {}, {},
options::OPT_fsanitize_merge_handlers_EQ,
- options::OPT_fno_sanitize_merge_handlers_EQ);
+ options::OPT_fno_sanitize_merge_handlers_EQ, nullptr);
MergeKinds &= Kinds;
+ // Parse -fno-sanitize-top-hot flags
+ SanitizerMask TopHotMask =
+ parseNoSanitizeHotArgs(D, Args, DiagnoseErrors, &TopHotCutoffs);
+ (void)TopHotMask;
+
// Setup ignorelist files.
// Add default ignorelist from resource directory for activated sanitizers,
// and validate special case lists format.
@@ -1132,6 +1146,15 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
"Overlap between recoverable and trapping sanitizers");
MergeHandlers.Mask |= MergeKinds;
+
+ TopHotMask &= Sanitizers.Mask;
+ TopHot.Mask = TopHotMask;
+
+ // Zero out TopHot for unused sanitizers
+ for (unsigned int i = 0; i < SanitizerKind::SO_Count; i++) {
+ if (!(Sanitizers.Mask & SanitizerMask::bitPosToMask(i)))
+ TopHotCutoffs[i] = 0;
+ }
}
static std::string toString(const clang::SanitizerSet &Sanitizers) {
@@ -1146,6 +1169,19 @@ static std::string toString(const clang::SanitizerSet &Sanitizers) {
return Res;
}
+static std::string toString(const clang::SanitizerMaskCutoffs &Cutoffs) {
+ std::string Res;
+#define SANITIZER(NAME, ID) \
+ if (Cutoffs[SanitizerKind::SO_##ID]) { \
+ if (!Res.empty()) \
+ Res += ","; \
+ Res += std::string(NAME) + "=" + \
+ std::to_string(Cutoffs[SanitizerKind::SO_##ID]); \
+ }
+#include "clang/Basic/Sanitizers.def"
+ return Res;
+}
+
static void addSpecialCaseListOpt(const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs,
const char *SCLOptFlag,
@@ -1297,6 +1333,11 @@ void SanitizerArgs::addArgs(const ToolChain &TC, const llvm::opt::ArgList &Args,
CmdArgs.push_back(
Args.MakeArgString("-fsanitize-merge=" + toString(MergeHandlers)));
+ std::string TopHotCutoffsStr = toString(TopHotCutoffs);
+ if (TopHotCutoffsStr != "")
+ CmdArgs.push_back(
+ Args.MakeArgString("-fno-sanitize-top-hot=" + TopHotCutoffsStr));
+
addSpecialCaseListOpt(Args, CmdArgs,
"-fsanitize-ignorelist=", UserIgnorelistFiles);
addSpecialCaseListOpt(Args, CmdArgs,
@@ -1463,17 +1504,18 @@ void SanitizerArgs::addArgs(const ToolChain &TC, const llvm::opt::ArgList &Args,
}
SanitizerMask parseArgValues(const Driver &D, const llvm::opt::Arg *A,
- bool DiagnoseErrors) {
- assert(
- (A->getOption().matches(options::OPT_fsanitize_EQ) ||
- A->getOption().matches(options::OPT_fno_sanitize_EQ) ||
- A->getOption().matches(options::OPT_fsanitize_recover_EQ) ||
- A->getOption().matches(options::OPT_fno_sanitize_recover_EQ) ||
- A->getOption().matches(options::OPT_fsanitize_trap_EQ) ||
- A->getOption().matches(options::OPT_fno_sanitize_trap_EQ) ||
- A->getOption().matches(options::OPT_fsanitize_merge_handlers_EQ) ||
- A->getOption().matches(options::OPT_fno_sanitize_merge_handlers_EQ)) &&
- "Invalid argument in parseArgValues!");
+ bool DiagnoseErrors,
+ SanitizerMaskCutoffs *Cutoffs) {
+ assert((A->getOption().matches(options::OPT_fsanitize_EQ) ||
+ A->getOption().matches(options::OPT_fno_sanitize_EQ) ||
+ A->getOption().matches(options::OPT_fsanitize_recover_EQ) ||
+ A->getOption().matches(options::OPT_fno_sanitize_recover_EQ) ||
+ A->getOption().matches(options::OPT_fsanitize_trap_EQ) ||
+ A->getOption().matches(options::OPT_fno_sanitize_trap_EQ) ||
+ A->getOption().matches(options::OPT_fsanitize_merge_handlers_EQ) ||
+ A->getOption().matches(options::OPT_fno_sanitize_merge_handlers_EQ) ||
+ A->getOption().matches(options::OPT_fno_sanitize_top_hot_EQ)) &&
+ "Invalid argument in parseArgValues!");
SanitizerMask Kinds;
for (int i = 0, n = A->getNumValues(); i != n; ++i) {
const char *Value = A->getValue(i);
@@ -1482,8 +1524,15 @@ SanitizerMask parseArgValues(const Driver &D, const llvm::opt::Arg *A,
if (A->getOption().matches(options::OPT_fsanitize_EQ) &&
0 == strcmp("all", Value))
Kind = SanitizerMask();
- else
+ else if (A->getOption().matches(options::OPT_fno_sanitize_top_hot_EQ)) {
+ assert(
+ Cutoffs &&
+ "Null Cutoffs parameter provided for parsing fno_sanitize_top_hot!");
+ Kind = parseSanitizerWeightedValue(Value, /*AllowGroups=*/true, Cutoffs);
+ } else {
+ assert((!Cutoffs) && "Non-null Cutoffs parameter erroneously provided!");
Kind = parseSanitizerValue(Value, /*AllowGroups=*/true);
+ }
if (Kind)
Kinds |= Kind;
@@ -1586,12 +1635,12 @@ std::string lastArgumentForMask(const Driver &D, const llvm::opt::ArgList &Args,
const auto *Arg = *I;
if (Arg->getOption().matches(options::OPT_fsanitize_EQ)) {
SanitizerMask AddKinds =
- expandSanitizerGroups(parseArgValues(D, Arg, false));
+ expandSanitizerGroups(parseArgValues(D, Arg, false, nullptr));
if (AddKinds & Mask)
return describeSanitizeArg(Arg, Mask);
} else if (Arg->getOption().matches(options::OPT_fno_sanitize_EQ)) {
SanitizerMask RemoveKinds =
- expandSanitizerGroups(parseArgValues(D, Arg, false));
+ expandSanitizerGroups(parseArgValues(D, Arg, false, nullptr));
Mask &= ~RemoveKinds;
}
}
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 348c56cc37da3f..78dd5099259f18 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -1436,6 +1436,19 @@ static SmallVector<StringRef, 4> serializeSanitizerKinds(SanitizerSet S) {
return Values;
}
+static void parseSanitizerWeightedKinds(
+ StringRef FlagName, const std::vector<std::string> &Sanitizers,
+ DiagnosticsEngine &Diags, SanitizerSet &S, SanitizerMaskCutoffs *Cutoffs) {
+ for (const auto &Sanitizer : Sanitizers) {
+ SanitizerMask K =
+ parseSanitizerWeightedValue(Sanitizer, /*AllowGroups=*/false, Cutoffs);
+ if (K == SanitizerMask())
+ Diags.Report(diag::err_drv_invalid_value) << FlagName << Sanitizer;
+ else
+ S.set(K, true);
+ }
+}
+
static void parseXRayInstrumentationBundle(StringRef FlagName, StringRef Bundle,
ArgList &Args, DiagnosticsEngine &D,
XRayInstrSet &S) {
@@ -1796,6 +1809,11 @@ void CompilerInvocationBase::GenerateCodeGenArgs(const CodeGenOptions &Opts,
serializeSanitizerKinds(Opts.SanitizeMergeHandlers))
GenerateArg(Consumer, OPT_fsanitize_merge_handlers_EQ, Sanitizer);
+ SmallVector<std::string, 4> Values;
+ serializeSanitizerMaskCutoffs(Opts.NoSanitizeTopHotCutoffs, Values);
+ for (std::string Sanitizer : Values)
+ GenerateArg(Consumer, OPT_fno_sanitize_top_hot_EQ, Sanitizer);
+
if (!Opts.EmitVersionIdentMetadata)
GenerateArg(Consumer, OPT_Qn);
@@ -2277,6 +2295,12 @@ bool CompilerInvocation::ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args,
Args.getAllArgValues(OPT_fsanitize_merge_handlers_EQ),
Diags, Opts.SanitizeMergeHandlers);
+ // Parse -fno-sanitize-top-hot= arguments.
+ parseSanitizerWeightedKinds("-fno-sanitize-top-hot=",
+ Args.getAllArgValues(OPT_fno_sanitize_top_hot_EQ),
+ Diags, Opts.NoSanitizeTopHot,
+ &Opts.NoSanitizeTopHotCutoffs);
+
Opts.EmitVersionIdentMetadata = Args.hasFlag(OPT_Qy, OPT_Qn, true);
if (!LangOpts->CUDAIsDevice)
diff --git a/clang/test/CodeGen/allow-ubsan-check.c b/clang/test/CodeGen/allow-ubsan-check.c
index 5232d240854666..1c76049b57bda8 100644
--- a/clang/test/CodeGen/allow-ubsan-check.c
+++ b/clang/test/CodeGen/allow-ubsan-check.c
@@ -3,7 +3,6 @@
// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -emit-llvm -o - %s -fsanitize=signed-integer-overflow,integer-divide-by-zero,null -mllvm -ubsan-guard-checks -fsanitize-trap=signed-integer-overflow,integer-divide-by-zero,null | FileCheck %s --check-prefixes=TRAP
// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -emit-llvm -o - %s -fsanitize=signed-integer-overflow,integer-divide-by-zero,null -mllvm -ubsan-guard-checks -fsanitize-recover=signed-integer-overflow,integer-divide-by-zero,null | FileCheck %s --check-prefixes=RECOVER
-
// CHECK-LABEL: define dso_local i32 @d...
[truncated]
|
vitalybuka
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vitalybuka
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vitalybuka
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vitalybuka
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vitalybuka
approved these changes
Jan 8, 2025
MaskRay
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MaskRay
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vitalybuka
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Jan 8, 2025
And fix V type in ::set.
Rename a few internal variables as well
thurstond
changed the title
vitalybuka
approved these changes
Jan 9, 2025
MaskRay
reviewed
Jan 10, 2025
clang/lib/Basic/Sanitizers.cpp
Outdated
| void SanitizerMaskCutoffs::set(SanitizerMask K, double V) { | ||
| if (V < SanitizerMaskCutoffsEps && Cutoffs.empty()) | ||
| return; | ||
| for (unsigned int i = 0; i < SanitizerKind::SO_Count; i++) |
There was a problem hiding this comment.
Fixed in 10e0a55. Thanks for the review!
MaskRay
approved these changes
Jan 10, 2025
|
LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/30/builds/13517 Here is the relevant piece of the build log for the reference |
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This adds a function to parse weighted sanitizer flags (e.g.,
-fsanitize-blah=undefined=0.5,null=0.3) and adds the plumbing to apply that to a new flag,-fsanitize-skip-hot-cutoff.-fsanitize-skip-hot-cutoffcurrently has no effect; future work will use it to generalize ubsan-guard-checks (originally introduced in 5f9ed2f).