[compiler-rt] r299629 - [XRay] [compiler-rt] Unwriting FDR mode buffers when functions are short.
Bill Seurer via llvm-commits
llvm-commits at lists.llvm.org
Mon Apr 10 13:32:03 PDT 2017
If clang is used to compile and the build is set up with
-DLLVM_ENABLE_WERROR=ON this change generates errors, at least on
powerpc LE.
(See for example
http://lab.llvm.org:8011/builders/sanitizer-ppc64le-linux/builds/1983/steps/build%20with%20ninja/logs/stdio)
FAILED:
projects/compiler-rt/lib/xray/tests/unit/CMakeFiles/xray_fdr_log_printer.dir/xray_fdr_log_printer_tool.cc.o
/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/clang_build/bin/clang++
-DLLVM_BUILD_GLOBAL_ISEL -D_DEBUG -D_GNU_SOURCE
-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
-Iprojects/compiler-rt/lib/xray/tests/unit
-I/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/tests/unit
-Iinclude
-I/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/include
-I/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/..
-I/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/../../include
-I/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/tests/..
-gmlt -fPIC -fvisibility-inlines-hidden -Werror -Werror=date-time
-std=c++11 -Wall -W -Wno-unused-parameter -Wwrite-strings -Wcast-qual
-Wmissing-field-initializers -pedantic -Wno-long-long
-Wcovered-switch-default -Wnon-virtual-dtor -Wdelete-non-virtual-dtor
-Wstring-conversion -fcolor-diagnostics -ffunction-sections
-fdata-sections -Wall -Werror -std=c++11 -Wno-unused-parameter -O3
-UNDEBUG -MMD -MT
projects/compiler-rt/lib/xray/tests/unit/CMakeFiles/xray_fdr_log_printer.dir/xray_fdr_log_printer_tool.cc.o
-MF
projects/compiler-rt/lib/xray/tests/unit/CMakeFiles/xray_fdr_log_printer.dir/xray_fdr_log_printer_tool.cc.o.d
-o
projects/compiler-rt/lib/xray/tests/unit/CMakeFiles/xray_fdr_log_printer.dir/xray_fdr_log_printer_tool.cc.o
-c
/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/tests/unit/xray_fdr_log_printer_tool.cc
In file included from
/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/tests/unit/xray_fdr_log_printer_tool.cc:15:
In file included from
/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/tests/../xray_fdr_logging_impl.h:35:
In file included from
/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/tests/../xray_flags.h:18:
/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/../sanitizer_common/sanitizer_flag_parser.h:23:7:
error: '__sanitizer::FlagHandlerBase' has virtual functions but
non-virtual destructor [-Werror,-Wnon-virtual-dtor]
class FlagHandlerBase {
^
/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/../sanitizer_common/sanitizer_flag_parser.h:29:7:
error: '__sanitizer::FlagHandler<bool>' has virtual functions but
non-virtual destructor [-Werror,-Wnon-virtual-dtor]
class FlagHandler : public FlagHandlerBase {
^
/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/../sanitizer_common/sanitizer_flag_parser.h:38:13:
note: in instantiation of template class
'__sanitizer::FlagHandler<bool>' requested here
inline bool FlagHandler<bool>::Parse(const char *value) {
^
/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/../sanitizer_common/sanitizer_flag_parser.h:29:7:
error: '__sanitizer::FlagHandler<const char *>' has virtual functions
but non-virtual destructor [-Werror,-Wnon-virtual-dtor]
class FlagHandler : public FlagHandlerBase {
^
/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/../sanitizer_common/sanitizer_flag_parser.h:56:13:
note: in instantiation of template class '__sanitizer::FlagHandler<const
char *>' requested here
inline bool FlagHandler<const char *>::Parse(const char *value) {
^
/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/../sanitizer_common/sanitizer_flag_parser.h:29:7:
error: '__sanitizer::FlagHandler<int>' has virtual functions but
non-virtual destructor [-Werror,-Wnon-virtual-dtor]
class FlagHandler : public FlagHandlerBase {
^
/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/../sanitizer_common/sanitizer_flag_parser.h:62:13:
note: in instantiation of template class '__sanitizer::FlagHandler<int>'
requested here
inline bool FlagHandler<int>::Parse(const char *value) {
^
/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/../sanitizer_common/sanitizer_flag_parser.h:29:7:
error: '__sanitizer::FlagHandler<unsigned long>' has virtual functions
but non-virtual destructor [-Werror,-Wnon-virtual-dtor]
class FlagHandler : public FlagHandlerBase {
^
/home/buildbots/ppc64le-sanitizer/sanitizer-ppc64le/build/llvm/projects/compiler-rt/lib/xray/../sanitizer_common/sanitizer_flag_parser.h:71:13:
note: in instantiation of template class
'__sanitizer::FlagHandler<unsigned long>' requested here
inline bool FlagHandler<uptr>::Parse(const char *value) {
^
5 errors generated.
On 04/06/2017 02:14 AM, Dean Michael Berris via llvm-commits wrote:
> Author: dberris
> Date: Thu Apr 6 02:14:43 2017
> New Revision: 299629
>
> URL: http://llvm.org/viewvc/llvm-project?rev=299629&view=rev
> Log:
> [XRay] [compiler-rt] Unwriting FDR mode buffers when functions are short.
>
> Summary:
> "short" is defined as an xray flag, and buffer rewinding happens for both exits
> and tail exits.
>
> I've made the choice to seek backwards finding pairs of FunctionEntry, TailExit
> record pairs and erasing them if the FunctionEntry occurred before exit from the
> currently exiting function. This is a compromise so that we don't skip logging
> tail calls if the function that they call into takes longer our duration.
>
> This works by counting the consecutive function and function entry, tail exit
> pairs that proceed the current point in the buffer. The buffer is rewound to
> check whether these entry points happened recently enough to be erased.
>
> It is still possible we will omit them if they call into a child function that
> is not instrumented which calls a fast grandchild that is instrumented before
> doing other processing.
>
> Reviewers: pelikan, dberris
>
> Reviewed By: dberris
>
> Subscribers: llvm-commits
>
> Differential Revision: https://reviews.llvm.org/D31345
>
> Modified:
> compiler-rt/trunk/lib/xray/xray_fdr_logging_impl.h
> compiler-rt/trunk/lib/xray/xray_flags.inc
> compiler-rt/trunk/test/xray/TestCases/Linux/fdr-mode.cc
>
> Modified: compiler-rt/trunk/lib/xray/xray_fdr_logging_impl.h
> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/xray/xray_fdr_logging_impl.h?rev=299629&r1=299628&r2=299629&view=diff
> ==============================================================================
> --- compiler-rt/trunk/lib/xray/xray_fdr_logging_impl.h (original)
> +++ compiler-rt/trunk/lib/xray/xray_fdr_logging_impl.h Thu Apr 6 02:14:43 2017
> @@ -32,6 +32,8 @@
> #include "xray_buffer_queue.h"
> #include "xray_defs.h"
> #include "xray_fdr_log_records.h"
> +#include "xray_flags.h"
> +#include "xray_tsc.h"
>
> namespace __xray {
>
> @@ -108,9 +110,17 @@ static void processFunctionHook(int32_t
> //-----------------------------------------------------------------------------|
>
> namespace {
> +
> thread_local BufferQueue::Buffer Buffer;
> thread_local char *RecordPtr = nullptr;
>
> +// The number of FunctionEntry records immediately preceding RecordPtr.
> +thread_local uint8_t NumConsecutiveFnEnters = 0;
> +
> +// The number of adjacent, consecutive pairs of FunctionEntry, Tail Exit
> +// records preceding RecordPtr.
> +thread_local uint8_t NumTailCalls = 0;
> +
> constexpr auto MetadataRecSize = sizeof(MetadataRecord);
> constexpr auto FunctionRecSize = sizeof(FunctionRecord);
>
> @@ -209,6 +219,8 @@ static inline void writeNewBufferPreambl
> }
> std::memcpy(MemPtr, Records, sizeof(MetadataRecord) * InitRecordsCount);
> MemPtr += sizeof(MetadataRecord) * InitRecordsCount;
> + NumConsecutiveFnEnters = 0;
> + NumTailCalls = 0;
> }
>
> static inline void setupNewBuffer(const BufferQueue::Buffer &Buffer,
> @@ -221,6 +233,8 @@ static inline void setupNewBuffer(const
> // This is typically clock_gettime, but callers have injection ability.
> wall_clock_reader(CLOCK_MONOTONIC, &TS);
> writeNewBufferPreamble(Tid, TS, RecordPtr);
> + NumConsecutiveFnEnters = 0;
> + NumTailCalls = 0;
> }
>
> static inline void writeNewCPUIdMetadata(uint16_t CPU, uint64_t TSC,
> @@ -237,6 +251,8 @@ static inline void writeNewCPUIdMetadata
> std::memcpy(&NewCPUId.Data[sizeof(CPU)], &TSC, sizeof(TSC));
> std::memcpy(MemPtr, &NewCPUId, sizeof(MetadataRecord));
> MemPtr += sizeof(MetadataRecord);
> + NumConsecutiveFnEnters = 0;
> + NumTailCalls = 0;
> }
>
> static inline void writeNewCPUIdMetadata(uint16_t CPU,
> @@ -251,6 +267,8 @@ static inline void writeEOBMetadata(char
> // For now we don't write any bytes into the Data field.
> std::memcpy(MemPtr, &EOBMeta, sizeof(MetadataRecord));
> MemPtr += sizeof(MetadataRecord);
> + NumConsecutiveFnEnters = 0;
> + NumTailCalls = 0;
> }
>
> static inline void writeEOBMetadata() XRAY_NEVER_INSTRUMENT {
> @@ -269,6 +287,8 @@ static inline void writeTSCWrapMetadata(
> std::memcpy(&TSCWrap.Data, &TSC, sizeof(TSC));
> std::memcpy(MemPtr, &TSCWrap, sizeof(MetadataRecord));
> MemPtr += sizeof(MetadataRecord);
> + NumConsecutiveFnEnters = 0;
> + NumTailCalls = 0;
> }
>
> static inline void writeTSCWrapMetadata(uint64_t TSC) XRAY_NEVER_INSTRUMENT {
> @@ -289,13 +309,35 @@ static inline void writeFunctionRecord(i
>
> switch (EntryType) {
> case XRayEntryType::ENTRY:
> + ++NumConsecutiveFnEnters;
> + FuncRecord.RecordKind = uint8_t(FunctionRecord::RecordKinds::FunctionEnter);
> + break;
> case XRayEntryType::LOG_ARGS_ENTRY:
> + // We should not rewind functions with logged args.
> + NumConsecutiveFnEnters = 0;
> + NumTailCalls = 0;
> FuncRecord.RecordKind = uint8_t(FunctionRecord::RecordKinds::FunctionEnter);
> break;
> case XRayEntryType::EXIT:
> + // If we've decided to log the function exit, we will never erase the log
> + // before it.
> + NumConsecutiveFnEnters = 0;
> + NumTailCalls = 0;
> FuncRecord.RecordKind = uint8_t(FunctionRecord::RecordKinds::FunctionExit);
> break;
> case XRayEntryType::TAIL:
> + // If we just entered the function we're tail exiting from or erased every
> + // invocation since then, this function entry tail pair is a candidate to
> + // be erased when the child function exits.
> + if (NumConsecutiveFnEnters > 0) {
> + ++NumTailCalls;
> + NumConsecutiveFnEnters = 0;
> + } else {
> + // We will never be able to erase this tail call since we have logged
> + // something in between the function entry and tail exit.
> + NumTailCalls = 0;
> + NumConsecutiveFnEnters = 0;
> + }
> FuncRecord.RecordKind =
> uint8_t(FunctionRecord::RecordKinds::FunctionTailExit);
> break;
> @@ -337,6 +379,8 @@ static inline void processFunctionHook(
> // We assume that we'll support only 65536 CPUs for x86_64.
> thread_local uint16_t CurrentCPU = std::numeric_limits<uint16_t>::max();
> thread_local uint64_t LastTSC = 0;
> + thread_local uint64_t LastFunctionEntryTSC = 0;
> + thread_local uint64_t NumberOfTicksThreshold = 0;
>
> // Make sure a thread that's ever called handleArg0 has a thread-local
> // live reference to the buffer queue for this particular instance of
> @@ -379,6 +423,10 @@ static inline void processFunctionHook(
> return;
> }
>
> + uint64_t CycleFrequency = getTSCFrequency();
> + NumberOfTicksThreshold = CycleFrequency *
> + flags()->xray_fdr_log_func_duration_threshold_us /
> + 1000000;
> setupNewBuffer(Buffer, wall_clock_reader);
> }
>
> @@ -441,6 +489,10 @@ static inline void processFunctionHook(
> BufferQueue::getErrorString(EC));
> return;
> }
> + uint64_t CycleFrequency = getTSCFrequency();
> + NumberOfTicksThreshold = CycleFrequency *
> + flags()->xray_fdr_log_func_duration_threshold_us /
> + 1000000;
> setupNewBuffer(Buffer, wall_clock_reader);
> }
>
> @@ -486,10 +538,92 @@ static inline void processFunctionHook(
> RecordTSCDelta = Delta;
> }
>
> - // We then update our "LastTSC" and "CurrentCPU" thread-local variables to aid
> - // us in future computations of this TSC delta value.
> LastTSC = TSC;
> CurrentCPU = CPU;
> + using AlignedFuncStorage =
> + std::aligned_storage<sizeof(FunctionRecord),
> + alignof(FunctionRecord)>::type;
> + switch (Entry) {
> + case XRayEntryType::ENTRY:
> + case XRayEntryType::LOG_ARGS_ENTRY:
> + // Update the thread local state for the next invocation.
> + LastFunctionEntryTSC = TSC;
> + break;
> + case XRayEntryType::TAIL:
> + break;
> + case XRayEntryType::EXIT:
> + // Break out and write the exit record if we can't erase any functions.
> + if (NumConsecutiveFnEnters == 0 ||
> + (TSC - LastFunctionEntryTSC) >= NumberOfTicksThreshold)
> + break;
> + // Otherwise we unwind functions that are too short to log by decrementing
> + // our view ptr into the buffer. We can erase a Function Entry record and
> + // neglect to log our EXIT. We have to make sure to update some state like
> + // the LastTSC and count of consecutive FunctionEntry records.
> + RecordPtr -= FunctionRecSize;
> + AlignedFuncStorage AlignedFuncRecordBuffer;
> + const auto &FuncRecord = *reinterpret_cast<FunctionRecord *>(
> + std::memcpy(&AlignedFuncRecordBuffer, RecordPtr, FunctionRecSize));
> + assert(FuncRecord.RecordKind ==
> + uint8_t(FunctionRecord::RecordKinds::FunctionEnter) &&
> + "Expected to find function entry recording when rewinding.");
> + assert(FuncRecord.FuncId == (FuncId & ~(0x0F << 28)) &&
> + "Expected matching function id when rewinding Exit");
> + --NumConsecutiveFnEnters;
> + LastTSC -= FuncRecord.TSCDelta;
> +
> + // We unwound one call. Update the state and return without writing a log.
> + if (NumConsecutiveFnEnters != 0) {
> + LastFunctionEntryTSC = LastFunctionEntryTSC - FuncRecord.TSCDelta;
> + return;
> + }
> +
> + // Otherwise we've rewound the stack of all function entries, we might be
> + // able to rewind further by erasing tail call functions that are being
> + // exited from via this exit.
> + LastFunctionEntryTSC = 0;
> + auto RewindingTSC = LastTSC;
> + auto RewindingRecordPtr = RecordPtr - FunctionRecSize;
> + while (NumTailCalls > 0) {
> + AlignedFuncStorage TailExitRecordBuffer;
> + // Rewind the TSC back over the TAIL EXIT record.
> + const auto &ExpectedTailExit =
> + *reinterpret_cast<FunctionRecord *>(std::memcpy(
> + &TailExitRecordBuffer, RewindingRecordPtr, FunctionRecSize));
> +
> + assert(ExpectedTailExit.RecordKind ==
> + uint8_t(FunctionRecord::RecordKinds::FunctionTailExit) &&
> + "Expected to find tail exit when rewinding.");
> + auto TailExitFuncId = ExpectedTailExit.FuncId;
> + RewindingRecordPtr -= FunctionRecSize;
> + RewindingTSC -= ExpectedTailExit.TSCDelta;
> + AlignedFuncStorage FunctionEntryBuffer;
> + const auto &ExpectedFunctionEntry =
> + *reinterpret_cast<FunctionRecord *>(std::memcpy(
> + &FunctionEntryBuffer, RewindingRecordPtr, FunctionRecSize));
> + assert(ExpectedFunctionEntry.RecordKind ==
> + uint8_t(FunctionRecord::RecordKinds::FunctionEnter) &&
> + "Expected to find function entry when rewinding tail call.");
> + assert(ExpectedFunctionEntry.FuncId == TailExitFuncId &&
> + "Expected funcids to match when rewinding tail call.");
> +
> + if ((TSC - RewindingTSC) < NumberOfTicksThreshold) {
> + // We can erase a tail exit pair that we're exiting through since
> + // its duration is under threshold.
> + --NumTailCalls;
> + RewindingRecordPtr -= FunctionRecSize;
> + RewindingTSC -= ExpectedFunctionEntry.TSCDelta;
> + RecordPtr -= 2 * FunctionRecSize;
> + LastTSC = RewindingTSC;
> + } else {
> + // This tail call exceeded the threshold duration. It will not
> + // be erased.
> + NumTailCalls = 0;
> + return;
> + }
> + }
> + return; // without writing log.
> + }
>
> writeFunctionRecord(FuncId, RecordTSCDelta, Entry, RecordPtr);
>
> @@ -510,5 +644,4 @@ static inline void processFunctionHook(
> } // namespace __xray_fdr_internal
>
> } // namespace __xray
> -
> #endif // XRAY_XRAY_FDR_LOGGING_IMPL_H
>
> Modified: compiler-rt/trunk/lib/xray/xray_flags.inc
> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/xray/xray_flags.inc?rev=299629&r1=299628&r2=299629&view=diff
> ==============================================================================
> --- compiler-rt/trunk/lib/xray/xray_flags.inc (original)
> +++ compiler-rt/trunk/lib/xray/xray_flags.inc Thu Apr 6 02:14:43 2017
> @@ -22,3 +22,6 @@ XRAY_FLAG(const char *, xray_logfile_bas
> "Filename base for the xray logfile.")
> XRAY_FLAG(bool, xray_fdr_log, false,
> "Whether to install the flight data recorder logging implementation.")
> +XRAY_FLAG(int, xray_fdr_log_func_duration_threshold_us, 5,
> + "FDR logging will try to skip functions that execute for fewer "
> + "microseconds than this threshold.")
>
> Modified: compiler-rt/trunk/test/xray/TestCases/Linux/fdr-mode.cc
> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/test/xray/TestCases/Linux/fdr-mode.cc?rev=299629&r1=299628&r2=299629&view=diff
> ==============================================================================
> --- compiler-rt/trunk/test/xray/TestCases/Linux/fdr-mode.cc (original)
> +++ compiler-rt/trunk/test/xray/TestCases/Linux/fdr-mode.cc Thu Apr 6 02:14:43 2017
> @@ -1,7 +1,10 @@
> // RUN: %clangxx_xray -g -std=c++11 %s -o %t
> -// RUN: XRAY_OPTIONS="patch_premain=false xray_naive_log=false xray_logfile_base=fdr-logging-test- xray_fdr_log=true verbosity=1" %run %t 2>&1 | FileCheck %s
> -// RUN: %llvm_xray convert --symbolize --output-format=yaml -instr_map=%t "`ls fdr-logging-test-* | head -1`" | FileCheck %s --check-prefix TRACE
> +// RUN: XRAY_OPTIONS="patch_premain=false xray_naive_log=false xray_logfile_base=fdr-logging-test- xray_fdr_log=true verbosity=1 xray_fdr_log_func_duration_threshold_us=0" %run %t 2>&1 | FileCheck %s
> +// RUN: XRAY_OPTIONS="patch_premain=false xray_naive_log=false xray_logfile_base=fdr-unwrite-test- xray_fdr_log=true verbosity=1 xray_fdr_log_func_duration_threshold_us=5000" %run %t 2>&1 | FileCheck %s
> +// RUN: %llvm_xray convert --symbolize --output-format=yaml -instr_map=%t "`ls fdr-logging-test-* | head -1`" | FileCheck %s --check-prefix=TRACE
> +// RUN: %llvm_xray convert --symbolize --output-format=yaml -instr_map=%t "`ls fdr-unwrite-test-* | head -1`" | FileCheck %s --check-prefix=UNWRITE
> // RUN: rm fdr-logging-test-*
> +// RUN: rm fdr-unwrite-test-*
> // FIXME: Make llvm-xray work on non-x86_64 as well.
> // REQUIRES: x86_64-linux
>
> @@ -61,8 +64,6 @@ int main(int argc, char *argv[]) {
> return 0;
> }
>
> -
> -
> // Check that we're able to see two threads, each entering and exiting fA().
> // TRACE-DAG: - { type: 0, func-id: [[FIDA:[0-9]+]], function: {{.*fA.*}}, cpu: {{.*}}, thread: [[THREAD1:[0-9]+]], kind: function-enter, tsc: {{[0-9]+}} }
> // TRACE: - { type: 0, func-id: [[FIDA]], function: {{.*fA.*}}, cpu: {{.*}}, thread: [[THREAD1]], kind: function-exit, tsc: {{[0-9]+}} }
> @@ -80,3 +81,9 @@ int main(int argc, char *argv[]) {
> // TRACE: - { type: 0, func-id: [[FIDB]], function: {{.*fB.*}}, cpu: {{.*}}, thread: [[THREAD1]], kind: function-exit, tsc: {{[0-9]+}} }
> // TRACE-DAG: - { type: 0, func-id: [[FIDB]], function: {{.*fB.*}}, cpu: {{.*}}, thread: [[THREAD2:[0-9]+]], kind: function-enter, tsc: {{[0-9]+}} }
> // TRACE: - { type: 0, func-id: [[FIDB]], function: {{.*fB.*}}, cpu: {{.*}}, thread: [[THREAD2]], kind: function-exit, tsc: {{[0-9]+}} }
> +
> +// Assert that when unwriting is enabled with a high threshold time, all the function records are erased. A CPU switch could erroneously fail this test, but
> +// is unlikely given the test program.
> +// UNWRITE: header
> +// UNWRITE-NOT: function-enter
> +// UNWRITE-NOT: function-exit
>
>
> _______________________________________________
> llvm-commits mailing list
> llvm-commits at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits
>
--
-Bill Seurer
More information about the llvm-commits
mailing list