[llvm] Revert "Reland "[llvm-profgen] Add support for ETM trace decoding"" (PR #194695)
via llvm-commits
llvm-commits at lists.llvm.org
Tue Apr 28 10:55:07 PDT 2026
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-binary-utilities
Author: gulfemsavrun
<details>
<summary>Changes</summary>
Reverts llvm/llvm-project#<!-- -->194465
Caused tools/llvm-profgen/etm-opencsd.test to fail on some systems.
---
Patch is 46.28 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/194695.diff
14 Files Affected:
- (modified) llvm/docs/CommandGuide/llvm-profgen.rst (+1-11)
- (modified) llvm/docs/ReleaseNotes.md (-2)
- (removed) llvm/include/llvm/ProfileData/ETMTraceDecoder.h (-46)
- (modified) llvm/lib/ProfileData/CMakeLists.txt (-21)
- (removed) llvm/lib/ProfileData/ETMTraceDecoder.cpp (-251)
- (removed) llvm/test/tools/llvm-profgen/Inputs/etm-opencsd.yaml (-48)
- (removed) llvm/test/tools/llvm-profgen/etm-arch.test (-81)
- (removed) llvm/test/tools/llvm-profgen/etm-opencsd.test (-19)
- (modified) llvm/test/tools/llvm-profgen/lit.local.cfg (-10)
- (modified) llvm/tools/llvm-profgen/PerfReader.cpp (+17-72)
- (modified) llvm/tools/llvm-profgen/PerfReader.h (+9-24)
- (modified) llvm/tools/llvm-profgen/ProfiledBinary.cpp (+4-6)
- (modified) llvm/tools/llvm-profgen/ProfiledBinary.h (+5-10)
- (modified) llvm/tools/llvm-profgen/llvm-profgen.cpp (+37-72)
``````````diff
diff --git a/llvm/docs/CommandGuide/llvm-profgen.rst b/llvm/docs/CommandGuide/llvm-profgen.rst
index 7dc646cac8e81..90ad729ec10b2 100644
--- a/llvm/docs/CommandGuide/llvm-profgen.rst
+++ b/llvm/docs/CommandGuide/llvm-profgen.rst
@@ -24,11 +24,6 @@ At least one of the following commands are required:
Path of perf-script trace created by Linux perf tool with `script`
command(the raw perf.data should be profiled with -b).
-.. option:: --etm=<string>
-
- Path of the ETM trace file created by ARM CoreSight trace tools.
- Requires the OpenCSD library to be enabled during the build.
-
.. option:: --perfdata=<perfdata>, --pd
Path of raw perf data created by Linux perf tool (it should be profiled
@@ -46,7 +41,7 @@ At least one of the following commands are required:
.. note::
Only one of ``--perfscript``, ``--perfdata``, ``--unsymbolized-profile``,
- ``--llvm-sample-profile``, or ``--etm`` may be specified at a time.
+ or ``--llvm-sample-profile`` may be specified at a time.
.. option:: --binary=<string[,string,...]>
@@ -84,11 +79,6 @@ OPTIONS
Path of debug info binary. ``llvm-profgen`` will load the DWARF info from
it instead of the executable binary.
-
-.. option:: --target-triple=<triple>
-
- Override the target triple for the binary. This is useful for ETM trace
- decoding to specify the correct Arm M-profile target.
.. option:: --pid
diff --git a/llvm/docs/ReleaseNotes.md b/llvm/docs/ReleaseNotes.md
index 7ee15d42b6837..5f9d6b93bf7d4 100644
--- a/llvm/docs/ReleaseNotes.md
+++ b/llvm/docs/ReleaseNotes.md
@@ -245,8 +245,6 @@ Changes to the Debug Info
Changes to the LLVM tools
-------------------------
-* `llvm-profgen` now supports ETM trace decoding using the OpenCSD library for Cortex-M targets.
-
* `llvm-objcopy` no longer corrupts the symbol table when `--update-section` is called for ELF files.
* `FileCheck` option `-check-prefix` now accepts a comma-separated list of
prefixes, making it an alias of the existing `-check-prefixes` option.
diff --git a/llvm/include/llvm/ProfileData/ETMTraceDecoder.h b/llvm/include/llvm/ProfileData/ETMTraceDecoder.h
deleted file mode 100644
index 86599fa2fb6d2..0000000000000
--- a/llvm/include/llvm/ProfileData/ETMTraceDecoder.h
+++ /dev/null
@@ -1,46 +0,0 @@
-//===-- ETMTraceDecoder.h - ETM Trace Decoder -------------------*- C++ -*-===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_PROFILEDATA_ETMTRACEDECODER_H
-#define LLVM_PROFILEDATA_ETMTRACEDECODER_H
-
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/Support/Error.h"
-
-#include <cstdint>
-#include <memory>
-
-namespace llvm {
-
-class Triple;
-namespace object {
-class Binary;
-}
-
-class ETMDecoder {
-public:
- virtual ~ETMDecoder() = default;
-
- class Callback {
- public:
- virtual ~Callback() = default;
- virtual void processInstructionRange(uint64_t Start, uint64_t End) = 0;
- };
-
- static Expected<std::unique_ptr<ETMDecoder>>
- create(const object::Binary &Binary, const Triple &TargetTriple,
- uint8_t TraceID = 0x10);
-
- virtual Error processTrace(ArrayRef<uint8_t> TraceData,
- Callback &TraceCallback) = 0;
-};
-
-} // namespace llvm
-
-#endif // LLVM_PROFILEDATA_ETMTRACEDECODER_H
diff --git a/llvm/lib/ProfileData/CMakeLists.txt b/llvm/lib/ProfileData/CMakeLists.txt
index 6259f5af897bf..c2366dc0ae03e 100644
--- a/llvm/lib/ProfileData/CMakeLists.txt
+++ b/llvm/lib/ProfileData/CMakeLists.txt
@@ -1,6 +1,5 @@
add_llvm_component_library(LLVMProfileData
DataAccessProf.cpp
- ETMTraceDecoder.cpp
GCOV.cpp
IndexedMemProfData.cpp
InstrProf.cpp
@@ -40,24 +39,4 @@ add_llvm_component_library(LLVMProfileData
TargetParser
)
-set(LLVM_ENABLE_OPENCSD "AUTO" CACHE STRING "Enable OpenCSD support in LLVMProfileData")
-
-if(NOT LLVM_ENABLE_OPENCSD STREQUAL "OFF")
- find_library(OPENCSD_LIB NAMES opencsd_c_api opencsd)
- find_path(OPENCSD_INCLUDE NAMES opencsd/ocsd_if_types.h)
-
- if(OPENCSD_LIB AND OPENCSD_INCLUDE)
- target_compile_definitions(LLVMProfileData PRIVATE HAVE_OPENCSD)
- target_include_directories(LLVMProfileData PRIVATE ${OPENCSD_INCLUDE})
- target_link_libraries(LLVMProfileData PRIVATE ${OPENCSD_LIB})
- message(STATUS "LLVMProfileData: OpenCSD support enabled.")
- else()
- if(LLVM_ENABLE_OPENCSD STREQUAL "ON")
- message(FATAL_ERROR "OpenCSD enabled but library or headers not found.")
- else()
- message(STATUS "LLVMProfileData: OpenCSD not found; ETM decoding support disabled.")
- endif()
- endif()
-endif()
-
add_subdirectory(Coverage)
diff --git a/llvm/lib/ProfileData/ETMTraceDecoder.cpp b/llvm/lib/ProfileData/ETMTraceDecoder.cpp
deleted file mode 100644
index 3d6a9846ac25c..0000000000000
--- a/llvm/lib/ProfileData/ETMTraceDecoder.cpp
+++ /dev/null
@@ -1,251 +0,0 @@
-//===-- ETMTraceDecoder.cpp - ETM Trace Decoder -----------------*- C++ -*-===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/ProfileData/ETMTraceDecoder.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/Object/ELFObjectFile.h"
-#include "llvm/Object/ObjectFile.h"
-#include "llvm/Support/Error.h"
-#include "llvm/TargetParser/ARMTargetParser.h"
-
-#ifdef HAVE_OPENCSD
-#include "opencsd/c_api/opencsd_c_api.h"
-
-namespace llvm {
-
-namespace {
-
-class HardwareTraceConfig {
-public:
- virtual ~HardwareTraceConfig() = default;
-};
-
-class ETMTraceConfig : public HardwareTraceConfig {
-public:
- ocsd_etmv4_cfg Cfg{};
- uint8_t TraceID;
-
- ETMTraceConfig(const Triple &TargetTriple, uint8_t TraceID)
- : TraceID(TraceID) {
- ocsd_arch_version_t ArchVer = ARCH_UNKNOWN;
- if (TargetTriple.isArmMClass()) {
- unsigned ArchVersion = ARM::parseArchVersion(TargetTriple.getArchName());
- if (ArchVersion >= 8)
- ArchVer = ARCH_V8;
- else if (ArchVersion == 7)
- ArchVer = ARCH_V7;
- else
- // For version 6 (Cortex-M0) and others.
- ArchVer = ARCH_UNKNOWN;
- }
- // Initialize the decoder for Arm M-profile targets.
- Cfg.arch_ver = ArchVer;
- Cfg.core_prof = profile_CortexM;
-
- // The CoreSight Trace ID (CSID) is a hardware-assigned 7-bit identifier
- // used to route trace data.
- Cfg.reg_traceidr = TraceID;
- }
-
- Error validate() const {
- if (Cfg.arch_ver == ARCH_UNKNOWN)
- return createStringError(
- inconvertibleErrorCode(),
- "OpenCSD: Unsupported processor architecture. Only Arm M-profile "
- "(Cortex-M) with ETM support is currently supported.");
- return Error::success();
- }
-};
-
-class ETMDecoderImpl : public ETMDecoder {
- dcd_tree_handle_t DcdTree = 0;
- const object::Binary &Binary;
- const Triple &TargetTriple;
-
- // Trace processing and Callback handling.
- static ocsd_datapath_resp_t
- processTrace(const void *PContext, const ocsd_trc_index_t /*IndexSOP*/,
- const uint8_t /*TrcChanID*/,
- const ocsd_generic_trace_elem *Element) {
- auto *Decoder = static_cast<ETMDecoderImpl *>(const_cast<void *>(PContext));
- if (!Decoder || !Element)
- return OCSD_RESP_FATAL_SYS_ERR;
-
- // Process instruction ranges reconstructed by the decoder.
- if (Element->elem_type == OCSD_GEN_TRC_ELEM_INSTR_RANGE) {
- uint64_t Start = Element->st_addr;
- uint64_t End = Element->en_addr;
- if (End > Start) {
- // OpenCSD ranges are exclusive at the end [Start, End).
- // llvm-profgen range counters expect inclusive bounds [Start, End].
- // Adjust the exclusive end address provided by OpenCSD to include
- // the last executed instruction within the reported range.
- Decoder->CurrentCallback->processInstructionRange(Start, End - 1);
- }
- }
- return OCSD_RESP_CONT;
- }
-
- Callback *CurrentCallback = nullptr;
-
- // Iterate through the ELF program headers to collect all executable LOAD
- // segments. These are registered as a single transaction to the OpenCSD
- // memory manager to prevent overlap/collision errors between different
- // memory regions.
- Error mapELFSegments(dcd_tree_handle_t DcdTree,
- const object::Binary &SourceBin) {
- SmallVector<ocsd_file_mem_region_t, 4> Regions;
- auto ProcessHeaders = [&](const auto &ElfFile) {
- auto ProgramHeaders = ElfFile.program_headers();
- if (!ProgramHeaders)
- return;
-
- for (const auto &Phdr : *ProgramHeaders) {
- if (Phdr.p_type == llvm::ELF::PT_LOAD &&
- (Phdr.p_flags & llvm::ELF::PF_X)) {
- ocsd_file_mem_region_t Region{};
- Region.start_address = (uint64_t)Phdr.p_vaddr;
- Region.file_offset = (uint64_t)Phdr.p_offset;
- Region.region_size = (uint64_t)Phdr.p_filesz;
- Regions.push_back(Region);
- }
- }
- };
-
- if (auto *O = dyn_cast<object::ELF32LEObjectFile>(&SourceBin))
- ProcessHeaders(O->getELFFile());
- else if (auto *O = dyn_cast<object::ELF64LEObjectFile>(&SourceBin))
- ProcessHeaders(O->getELFFile());
- else if (auto *O = dyn_cast<object::ELF32BEObjectFile>(&SourceBin))
- ProcessHeaders(O->getELFFile());
- else if (auto *O = dyn_cast<object::ELF64BEObjectFile>(&SourceBin))
- ProcessHeaders(O->getELFFile());
-
- if (!Regions.empty()) {
- std::string Path = SourceBin.getFileName().str();
- if (ocsd_dt_add_binfile_region_mem_acc(
- DcdTree, Regions.data(), (uint32_t)Regions.size(),
- OCSD_MEM_SPACE_ANY, Path.c_str()) != 0) {
- return createStringError(
- inconvertibleErrorCode(),
- "OpenCSD: Failed to map ELF executable segments.");
- }
- }
- return Error::success();
- }
-
-public:
- uint8_t TraceID;
-
- ETMDecoderImpl(const object::Binary &Binary, const Triple &Triple,
- uint8_t TraceID)
- : Binary(Binary), TargetTriple(Triple), TraceID(TraceID) {}
-
- ~ETMDecoderImpl() override {
- if (DcdTree)
- // Deallocate the decoder tree resources.
- ocsd_destroy_dcd_tree(DcdTree);
- }
-
- // Initialize the decoder by auto-detecting the target architecture and
- // configuring the OpenCSD decoder.
- Error initialize() {
- DcdTree = ocsd_create_dcd_tree(OCSD_TRC_SRC_SINGLE, 0);
- if (!DcdTree)
- return createStringError(inconvertibleErrorCode(),
- "Failed to create OpenCSD decoder tree.");
-
- // Configure and initialize the instruction-level decoder.
- ETMTraceConfig Config(TargetTriple, TraceID);
- if (Error E = Config.validate())
- return E;
-
- uint32_t Flags =
- OCSD_CREATE_FLG_FULL_DECODER | OCSD_OPFLG_CHK_RANGE_CONTINUE;
- if (ocsd_dt_create_decoder(DcdTree, OCSD_BUILTIN_DCD_ETMV4I, Flags,
- (void *)&Config.Cfg, &Config.TraceID) != 0)
- return createStringError(
- inconvertibleErrorCode(),
- "OpenCSD: Failed to initialize the instruction decoder.");
-
- // Extract and map executable segments from the ELF binary.
- if (Error E = mapELFSegments(DcdTree, Binary))
- return E;
-
- // Register the high-level packet callback. The 'processTrace' function
- // will be invoked for every decoded instruction range.
- ocsd_dt_set_gen_elem_outfn(DcdTree, processTrace, this);
- return Error::success();
- }
-
- Error processTrace(ArrayRef<uint8_t> TraceData,
- Callback &TraceCallback) override {
- CurrentCallback = &TraceCallback;
- // Initial reset to prime the decoder.
- ocsd_dt_process_data(DcdTree, OCSD_OP_RESET, 0, 0, nullptr, nullptr);
-
- const uint8_t *DataPtr = TraceData.data();
- uint32_t TotalSize = TraceData.size();
- uint32_t Processed = 0;
-
- // Core Decoding Loop.
- while (Processed < TotalSize) {
- uint32_t Consumed = 0;
- uint32_t Remaining = TotalSize - Processed;
- ocsd_datapath_resp_t Response =
- ocsd_dt_process_data(DcdTree, OCSD_OP_DATA, Processed, Remaining,
- DataPtr + Processed, &Consumed);
-
- if (Response == OCSD_RESP_WAIT) {
- // Decoder buffers are full; flush to drain internal states.
- ocsd_dt_process_data(DcdTree, OCSD_OP_FLUSH, 0, 0, nullptr, nullptr);
- } else if (Consumed == 0 && Processed < TotalSize) {
- // Decoder stalled; skip byte and reset to find next sync point.
- Processed++;
- ocsd_dt_process_data(DcdTree, OCSD_OP_RESET, 0, 0, nullptr, nullptr);
- } else {
- // Successfully consumed bytes of the bitstream.
- Processed += Consumed;
- }
-
- if (Response >= OCSD_RESP_FATAL_INVALID_DATA)
- return createStringError(inconvertibleErrorCode(),
- "OpenCSD: Fatal decoding error.");
- }
-
- // Finalize the decoding session by flushing the EOT (End of Trace) marker.
- ocsd_dt_process_data(DcdTree, OCSD_OP_EOT, 0, 0, nullptr, nullptr);
- return Error::success();
- }
-};
-} // namespace
-
-Expected<std::unique_ptr<ETMDecoder>>
-ETMDecoder::create(const object::Binary &Binary, const Triple &Triple,
- uint8_t TraceID) {
- auto Decoder = std::make_unique<ETMDecoderImpl>(Binary, Triple, TraceID);
- if (Error E = Decoder->initialize())
- return std::move(E);
- return std::unique_ptr<ETMDecoder>(std::move(Decoder));
-}
-
-} // namespace llvm
-
-#else // !HAVE_OPENCSD
-
-namespace llvm {
-
-Expected<std::unique_ptr<ETMDecoder>>
-ETMDecoder::create(const object::Binary & /*Binary*/, const Triple & /*Triple*/,
- uint8_t /*TraceID*/) {
- return createStringError(inconvertibleErrorCode(), "OpenCSD not enabled.");
-}
-
-} // namespace llvm
-
-#endif // HAVE_OPENCSD
diff --git a/llvm/test/tools/llvm-profgen/Inputs/etm-opencsd.yaml b/llvm/test/tools/llvm-profgen/Inputs/etm-opencsd.yaml
deleted file mode 100644
index 6824b4a9c108b..0000000000000
--- a/llvm/test/tools/llvm-profgen/Inputs/etm-opencsd.yaml
+++ /dev/null
@@ -1,48 +0,0 @@
-# This file contains binary data extracted from the OpenCSD repository sample tests
-# (specifically from decoder/tests/snapshots/armv8_1m_branches/).
-# It is used to verify ETM trace decoding in llvm-profgen.
---- !ELF
-FileHeader:
- Class: ELFCLASS32
- Data: ELFDATA2LSB
- Type: ET_DYN
- Machine: EM_ARM
- Flags: [ EF_ARM_EABI_VER5 ]
-ProgramHeaders:
- - Type: PT_LOAD
- Flags: [ PF_X, PF_R ]
- VAddr: 0x1E008
- FirstSec: .text1
- LastSec: .text1
- - Type: PT_LOAD
- Flags: [ PF_X, PF_R ]
- VAddr: 0x4F9A02
- FirstSec: .text2
- LastSec: .text2
-Sections:
- - Name: .text1
- Type: SHT_PROGBITS
- Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
- Address: 0x1E008
- AddressAlign: 0x4
- Content: 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
- - Name: .text2
- Type: SHT_PROGBITS
- Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
- Address: 0x4F9A02
- AddressAlign: 0x4
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[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/194695
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