Reland "Add a pass to collect dropped var stats for MIR" #117044
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@llvm/pr-subscribers-llvm-ir Author: Shubham Sandeep Rastogi (rastogishubham) ChangesMoved the MIR Test to the unittests/CodeGen folder This is patch is part of a stack of patches, and follows #117042 I moved the MIR test to the unittests/CodeGen folder I am trying to reland #115566 Patch is 80.96 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/117044.diff 11 Files Affected:
diff --git a/llvm/include/llvm/CodeGen/DroppedVariableStats.h b/llvm/include/llvm/CodeGen/DroppedVariableStats.h
new file mode 100644
index 00000000000000..f6050c68c91aaf
--- /dev/null
+++ b/llvm/include/llvm/CodeGen/DroppedVariableStats.h
@@ -0,0 +1,272 @@
+///===- DroppedVariableStats.h - Opt Diagnostics -*- 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
+///
+///===---------------------------------------------------------------------===//
+/// \file
+/// Dropped Variable Statistics for Debug Information. Reports any number
+/// of #dbg_values or DBG_VALUEs that get dropped due to an optimization pass.
+///
+///===---------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_DROPPEDVARIABLESTATS_H
+#define LLVM_CODEGEN_DROPPEDVARIABLESTATS_H
+
+#include "llvm/CodeGen/MachinePassManager.h"
+#include "llvm/IR/DebugInfoMetadata.h"
+#include "llvm/IR/DiagnosticInfo.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/PassInstrumentation.h"
+
+namespace llvm {
+
+/// A unique key that represents a debug variable.
+/// First const DIScope *: Represents the scope of the debug variable.
+/// Second const DIScope *: Represents the InlinedAt scope of the debug
+/// variable. const DILocalVariable *: It is a pointer to the debug variable
+/// itself.
+using VarID =
+ std::tuple<const DIScope *, const DIScope *, const DILocalVariable *>;
+
+/// A base class to collect and print dropped debug information variable
+/// statistics.
+class DroppedVariableStats {
+public:
+ DroppedVariableStats(bool DroppedVarStatsEnabled)
+ : DroppedVariableStatsEnabled(DroppedVarStatsEnabled) {
+ if (DroppedVarStatsEnabled)
+ llvm::outs()
+ << "Pass Level, Pass Name, Num of Dropped Variables, Func or "
+ "Module Name\n";
+ };
+
+ virtual ~DroppedVariableStats() = default;
+
+ // We intend this to be unique per-compilation, thus no copies.
+ DroppedVariableStats(const DroppedVariableStats &) = delete;
+ void operator=(const DroppedVariableStats &) = delete;
+
+ bool getPassDroppedVariables() { return PassDroppedVariables; }
+
+protected:
+ void setup() {
+ DebugVariablesStack.push_back(
+ {DenseMap<const Function *, DebugVariables>()});
+ InlinedAts.push_back(
+ {DenseMap<StringRef, DenseMap<VarID, DILocation *>>()});
+ }
+
+ void cleanup() {
+ assert(!DebugVariablesStack.empty() &&
+ "DebugVariablesStack shouldn't be empty!");
+ assert(!InlinedAts.empty() && "InlinedAts shouldn't be empty!");
+ DebugVariablesStack.pop_back();
+ InlinedAts.pop_back();
+ }
+
+ bool DroppedVariableStatsEnabled = false;
+ struct DebugVariables {
+ /// DenseSet of VarIDs before an optimization pass has run.
+ DenseSet<VarID> DebugVariablesBefore;
+ /// DenseSet of VarIDs after an optimization pass has run.
+ DenseSet<VarID> DebugVariablesAfter;
+ };
+
+protected:
+ /// A stack of a DenseMap, that maps DebugVariables for every pass to an
+ /// llvm::Function. A stack is used because an optimization pass can call
+ /// other passes.
+ SmallVector<DenseMap<const Function *, DebugVariables>> DebugVariablesStack;
+
+ /// A DenseSet tracking whether a scope was visited before.
+ DenseSet<const DIScope *> VisitedScope;
+ /// A stack of DenseMaps, which map the name of an llvm::Function to a
+ /// DenseMap of VarIDs and their inlinedAt locations before an optimization
+ /// pass has run.
+ SmallVector<DenseMap<StringRef, DenseMap<VarID, DILocation *>>> InlinedAts;
+ /// Calculate the number of dropped variables in an llvm::Function or
+ /// llvm::MachineFunction and print the relevant information to stdout.
+ void calculateDroppedStatsAndPrint(DebugVariables &DbgVariables,
+ StringRef FuncName, StringRef PassID,
+ StringRef FuncOrModName,
+ StringRef PassLevel, const Function *Func);
+
+ /// Check if a \p Var has been dropped or is a false positive. Also update the
+ /// \p DroppedCount if a debug variable is dropped.
+ bool updateDroppedCount(DILocation *DbgLoc, const DIScope *Scope,
+ const DIScope *DbgValScope,
+ DenseMap<VarID, DILocation *> &InlinedAtsMap,
+ VarID Var, unsigned &DroppedCount);
+ /// Run code to populate relevant data structures over an llvm::Function or
+ /// llvm::MachineFunction.
+ void run(DebugVariables &DbgVariables, StringRef FuncName, bool Before);
+ /// Populate the VarIDSet and InlinedAtMap with the relevant information
+ /// needed for before and after pass analysis to determine dropped variable
+ /// status.
+ void populateVarIDSetAndInlinedMap(
+ const DILocalVariable *DbgVar, DebugLoc DbgLoc, DenseSet<VarID> &VarIDSet,
+ DenseMap<StringRef, DenseMap<VarID, DILocation *>> &InlinedAtsMap,
+ StringRef FuncName, bool Before);
+ /// Visit every llvm::Instruction or llvm::MachineInstruction and check if the
+ /// debug variable denoted by its ID \p Var may have been dropped by an
+ /// optimization pass.
+ virtual void
+ visitEveryInstruction(unsigned &DroppedCount,
+ DenseMap<VarID, DILocation *> &InlinedAtsMap,
+ VarID Var) = 0;
+ /// Visit every debug record in an llvm::Function or llvm::MachineFunction
+ /// and call populateVarIDSetAndInlinedMap on it.
+ virtual void visitEveryDebugRecord(
+ DenseSet<VarID> &VarIDSet,
+ DenseMap<StringRef, DenseMap<VarID, DILocation *>> &InlinedAtsMap,
+ StringRef FuncName, bool Before) = 0;
+
+private:
+ /// Remove a dropped debug variable's VarID from all Sets in the
+ /// DroppedVariablesBefore stack.
+ void removeVarFromAllSets(VarID Var, const Function *F) {
+ // Do not remove Var from the last element, it will be popped from the
+ // stack.
+ for (auto &DebugVariablesMap : llvm::drop_end(DebugVariablesStack))
+ DebugVariablesMap[F].DebugVariablesBefore.erase(Var);
+ }
+ /// Return true if \p Scope is the same as \p DbgValScope or a child scope of
+ /// \p DbgValScope, return false otherwise.
+ bool isScopeChildOfOrEqualTo(const DIScope *Scope,
+ const DIScope *DbgValScope);
+ /// Return true if \p InlinedAt is the same as \p DbgValInlinedAt or part of
+ /// the InlinedAt chain, return false otherwise.
+ bool isInlinedAtChildOfOrEqualTo(const DILocation *InlinedAt,
+ const DILocation *DbgValInlinedAt);
+ bool PassDroppedVariables = false;
+};
+
+/// A class to collect and print dropped debug information due to LLVM IR
+/// optimization passes. After every LLVM IR pass is run, it will print how many
+/// #dbg_values were dropped due to that pass.
+class DroppedVariableStatsIR : public DroppedVariableStats {
+public:
+ DroppedVariableStatsIR(bool DroppedVarStatsEnabled)
+ : llvm::DroppedVariableStats(DroppedVarStatsEnabled) {}
+
+ virtual ~DroppedVariableStatsIR() = default;
+
+ void runBeforePass(Any IR) {
+ setup();
+ if (const auto *M = unwrapIR<Module>(IR))
+ return this->runOnModule(M, true);
+ if (const auto *F = unwrapIR<Function>(IR))
+ return this->runOnFunction(F, true);
+ }
+
+ void runAfterPass(StringRef P, Any IR) {
+ if (const auto *M = unwrapIR<Module>(IR))
+ runAfterPassModule(P, M);
+ else if (const auto *F = unwrapIR<Function>(IR))
+ runAfterPassFunction(P, F);
+ cleanup();
+ }
+
+ void registerCallbacks(PassInstrumentationCallbacks &PIC);
+
+private:
+ const Function *Func;
+
+ void runAfterPassFunction(StringRef PassID, const Function *F) {
+ runOnFunction(F, false);
+ calculateDroppedVarStatsOnFunction(F, PassID, F->getName().str(),
+ "Function");
+ }
+
+ void runAfterPassModule(StringRef PassID, const Module *M) {
+ runOnModule(M, false);
+ calculateDroppedVarStatsOnModule(M, PassID, M->getName().str(), "Module");
+ }
+ /// Populate DebugVariablesBefore, DebugVariablesAfter, InlinedAts before or
+ /// after a pass has run to facilitate dropped variable calculation for an
+ /// llvm::Function.
+ void runOnFunction(const Function *F, bool Before);
+ /// Iterate over all Instructions in a Function and report any dropped debug
+ /// information.
+ void calculateDroppedVarStatsOnFunction(const Function *F, StringRef PassID,
+ StringRef FuncOrModName,
+ StringRef PassLevel);
+ /// Populate DebugVariablesBefore, DebugVariablesAfter, InlinedAts before or
+ /// after a pass has run to facilitate dropped variable calculation for an
+ /// llvm::Module. Calls runOnFunction on every Function in the Module.
+ void runOnModule(const Module *M, bool Before);
+ /// Iterate over all Functions in a Module and report any dropped debug
+ /// information. Will call calculateDroppedVarStatsOnFunction on every
+ /// Function.
+ void calculateDroppedVarStatsOnModule(const Module *M, StringRef PassID,
+ StringRef FuncOrModName,
+ StringRef PassLevel);
+ /// Override base class method to run on an llvm::Function specifically.
+ virtual void
+ visitEveryInstruction(unsigned &DroppedCount,
+ DenseMap<VarID, DILocation *> &InlinedAtsMap,
+ VarID Var) override;
+ /// Override base class method to run on #dbg_values specifically.
+ virtual void visitEveryDebugRecord(
+ DenseSet<VarID> &VarIDSet,
+ DenseMap<StringRef, DenseMap<VarID, DILocation *>> &InlinedAtsMap,
+ StringRef FuncName, bool Before) override;
+
+ template <typename IRUnitT> static const IRUnitT *unwrapIR(Any IR) {
+ const IRUnitT **IRPtr = llvm::any_cast<const IRUnitT *>(&IR);
+ return IRPtr ? *IRPtr : nullptr;
+ }
+};
+
+/// A class to collect and print dropped debug information due to MIR
+/// optimization passes. After every MIR pass is run, it will print how many
+/// #DBG_VALUEs were dropped due to that pass.
+class DroppedVariableStatsMIR : public DroppedVariableStats {
+public:
+ DroppedVariableStatsMIR() : llvm::DroppedVariableStats(false) {}
+
+ void runBeforePass(StringRef PassID, MachineFunction *MF) {
+ if (PassID == "Debug Variable Analysis")
+ return;
+ setup();
+ return runOnMachineFunction(MF, true);
+ }
+
+ void runAfterPass(StringRef PassID, MachineFunction *MF) {
+ if (PassID == "Debug Variable Analysis")
+ return;
+ runOnMachineFunction(MF, false);
+ calculateDroppedVarStatsOnMachineFunction(MF, PassID, MF->getName().str());
+ cleanup();
+ }
+
+private:
+ const MachineFunction *MFunc;
+ /// Populate DebugVariablesBefore, DebugVariablesAfter, InlinedAts before or
+ /// after a pass has run to facilitate dropped variable calculation for an
+ /// llvm::MachineFunction.
+ void runOnMachineFunction(const MachineFunction *MF, bool Before);
+ /// Iterate over all Instructions in a MachineFunction and report any dropped
+ /// debug information.
+ void calculateDroppedVarStatsOnMachineFunction(const MachineFunction *MF,
+ StringRef PassID,
+ StringRef FuncOrModName);
+ /// Override base class method to run on an llvm::MachineFunction
+ /// specifically.
+ virtual void
+ visitEveryInstruction(unsigned &DroppedCount,
+ DenseMap<VarID, DILocation *> &InlinedAtsMap,
+ VarID Var) override;
+ /// Override base class method to run on DBG_VALUEs specifically.
+ virtual void visitEveryDebugRecord(
+ DenseSet<VarID> &VarIDSet,
+ DenseMap<StringRef, DenseMap<VarID, DILocation *>> &InlinedAtsMap,
+ StringRef FuncName, bool Before) override;
+};
+
+} // namespace llvm
+
+#endif
diff --git a/llvm/include/llvm/CodeGen/MachineFunctionPass.h b/llvm/include/llvm/CodeGen/MachineFunctionPass.h
index caaf22c2139e31..d82b593497ffc3 100644
--- a/llvm/include/llvm/CodeGen/MachineFunctionPass.h
+++ b/llvm/include/llvm/CodeGen/MachineFunctionPass.h
@@ -18,6 +18,7 @@
#ifndef LLVM_CODEGEN_MACHINEFUNCTIONPASS_H
#define LLVM_CODEGEN_MACHINEFUNCTIONPASS_H
+#include "llvm/CodeGen/DroppedVariableStats.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/Pass.h"
@@ -67,6 +68,7 @@ class MachineFunctionPass : public FunctionPass {
MachineFunctionProperties RequiredProperties;
MachineFunctionProperties SetProperties;
MachineFunctionProperties ClearedProperties;
+ DroppedVariableStatsMIR DroppedVarStatsMF;
/// createPrinterPass - Get a machine function printer pass.
Pass *createPrinterPass(raw_ostream &O,
diff --git a/llvm/include/llvm/Passes/StandardInstrumentations.h b/llvm/include/llvm/Passes/StandardInstrumentations.h
index 9301a12c740eec..12a34c099eaffe 100644
--- a/llvm/include/llvm/Passes/StandardInstrumentations.h
+++ b/llvm/include/llvm/Passes/StandardInstrumentations.h
@@ -19,6 +19,7 @@
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSet.h"
+#include "llvm/CodeGen/DroppedVariableStats.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/DebugInfoMetadata.h"
@@ -579,83 +580,6 @@ class PrintCrashIRInstrumentation {
static void SignalHandler(void *);
};
-/// A class to collect and print dropped debug information variable statistics.
-/// After every LLVM IR pass is run, it will print how many #dbg_values were
-/// dropped due to that pass.
-class DroppedVariableStats {
-public:
- DroppedVariableStats(bool DroppedVarStatsEnabled) {
- if (DroppedVarStatsEnabled)
- llvm::outs()
- << "Pass Level, Pass Name, Num of Dropped Variables, Func or "
- "Module Name\n";
- };
- // We intend this to be unique per-compilation, thus no copies.
- DroppedVariableStats(const DroppedVariableStats &) = delete;
- void operator=(const DroppedVariableStats &) = delete;
-
- void registerCallbacks(PassInstrumentationCallbacks &PIC);
- void runBeforePass(StringRef PassID, Any IR);
- void runAfterPass(StringRef PassID, Any IR, const PreservedAnalyses &PA);
- void runAfterPassInvalidated(StringRef PassID, const PreservedAnalyses &PA);
- bool getPassDroppedVariables() { return PassDroppedVariables; }
-
-private:
- bool PassDroppedVariables = false;
- /// A unique key that represents a #dbg_value.
- using VarID =
- std::tuple<const DIScope *, const DIScope *, const DILocalVariable *>;
-
- struct DebugVariables {
- /// DenseSet of VarIDs before an optimization pass has run.
- DenseSet<VarID> DebugVariablesBefore;
- /// DenseSet of VarIDs after an optimization pass has run.
- DenseSet<VarID> DebugVariablesAfter;
- };
-
- /// A stack of a DenseMap, that maps DebugVariables for every pass to an
- /// llvm::Function. A stack is used because an optimization pass can call
- /// other passes.
- SmallVector<DenseMap<const Function *, DebugVariables>> DebugVariablesStack;
-
- /// A DenseSet tracking whether a scope was visited before.
- DenseSet<const DIScope *> VisitedScope;
- /// A stack of DenseMaps, which map the name of an llvm::Function to a
- /// DenseMap of VarIDs and their inlinedAt locations before an optimization
- /// pass has run.
- SmallVector<DenseMap<StringRef, DenseMap<VarID, DILocation *>>> InlinedAts;
-
- /// Iterate over all Functions in a Module and report any dropped debug
- /// information. Will call calculateDroppedVarStatsOnFunction on every
- /// Function.
- void calculateDroppedVarStatsOnModule(const Module *M, StringRef PassID,
- std::string FuncOrModName,
- std::string PassLevel);
- /// Iterate over all Instructions in a Function and report any dropped debug
- /// information.
- void calculateDroppedVarStatsOnFunction(const Function *F, StringRef PassID,
- std::string FuncOrModName,
- std::string PassLevel);
- /// Populate DebugVariablesBefore, DebugVariablesAfter, InlinedAts before or
- /// after a pass has run to facilitate dropped variable calculation for an
- /// llvm::Function.
- void runOnFunction(const Function *F, bool Before);
- /// Populate DebugVariablesBefore, DebugVariablesAfter, InlinedAts before or
- /// after a pass has run to facilitate dropped variable calculation for an
- /// llvm::Module. Calls runOnFunction on every Function in the Module.
- void runOnModule(const Module *M, bool Before);
- /// Remove a dropped #dbg_value VarID from all Sets in the
- /// DroppedVariablesBefore stack.
- void removeVarFromAllSets(VarID Var, const Function *F);
- /// Return true if \p Scope is the same as \p DbgValScope or a child scope of
- /// \p DbgValScope, return false otherwise.
- bool isScopeChildOfOrEqualTo(DIScope *Scope, const DIScope *DbgValScope);
- /// Return true if \p InlinedAt is the same as \p DbgValInlinedAt or part of
- /// the InlinedAt chain, return false otherwise.
- bool isInlinedAtChildOfOrEqualTo(const DILocation *InlinedAt,
- const DILocation *DbgValInlinedAt);
-};
-
/// This class provides an interface to register all the standard pass
/// instrumentations and manages their state (if any).
class StandardInstrumentations {
@@ -673,7 +597,7 @@ class StandardInstrumentations {
PrintCrashIRInstrumentation PrintCrashIR;
IRChangedTester ChangeTester;
VerifyInstrumentation Verify;
- DroppedVariableStats DroppedStats;
+ DroppedVariableStatsIR DroppedStatsIR;
bool VerifyEach;
diff --git a/llvm/lib/CodeGen/CMakeLists.txt b/llvm/lib/CodeGen/CMakeLists.txt
index 7b47c0e6f75dbe..263d4a9ee94d2e 100644
--- a/llvm/lib/CodeGen/CMakeLists.txt
+++ b/llvm/lib/CodeGen/CMakeLists.txt
@@ -50,6 +50,7 @@ add_llvm_component_library(LLVMCodeGen
DeadMachineInstructionElim.cpp
DetectDeadLanes.cpp
DFAPacketizer.cpp
+ DroppedVariableStats.cpp
DwarfEHPrepare.cpp
EarlyIfConversion.cpp
EdgeBundles.cpp
diff --git a/llvm/lib/CodeGen/DroppedVariableStats.cpp b/llvm/lib/CodeGen/DroppedVariableStats.cpp
new file mode 100644
index 00000000000000..71f91292160f58
--- /dev/null
+++ b/llvm/lib/CodeGen/DroppedVariableStats.cpp
@@ -0,0 +1,255 @@
+///===- DroppedVariableStats.cpp ------------------------------------------===//
+///
+/// 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
+///
+///===---------------------------------------------------------------------===//
+/// \file
+/// Dropped Variable Statistics for Debug Information. Reports any number
+/// of #dbg_values or DBG_VALUEs that get dropped due to an optimization pass.
+///
+///===---------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/DroppedVariableStats.h"
+#include "llvm/IR/DebugInfoMetadata.h"
+#include "llvm/IR/InstIterator.h"
+#include "llvm/IR/Module.h"
+
+using namespace llvm;
+
+bool DroppedVariableStats::isScopeChildOfOrEqualTo(const DIScope *Scope,
+ const DIScope *DbgValScope) {
+ while (Scope != nullptr) {
+ if (VisitedScope.find(Scope) == VisitedScope.end()) {
+ VisitedScope.insert(Scope);
+ if (Scope == DbgValScope) {
+ VisitedScope.clear();
+ return true;
+ }
+ Scope = Scope->getScope();
+ } else {
+ VisitedScope.clear();
+ return false;
+ }
+ }
+ return false;
+}
+
+bool DroppedVariableStats::isInlinedAtChildOfOrEqualTo(
+ const DILocation *InlinedAt, const DILocation *DbgValInlinedAt) {
+ if (DbgValInlinedAt == InlinedAt)
+ return true;
+ if (!DbgValInlinedAt)
+ return false;
+ auto *IA = InlinedAt;
+ while (IA) {
+ if (IA == DbgValInlinedAt)
+ return true;
+ IA = IA->getInlinedAt();
+ }
+ return false;
+}
+
+void DroppedVariableStats::calculateDroppedStatsAndPrint(
+ DebugVariables &DbgVariables, StringRef FuncName, StringRef Pa...
[truncated]
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rastogishubham
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Moved the MIR Test to the unittests/CodeGen folder
rastogishubham
force-pushed
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MIRStatsFix
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e4e58a3
Compare
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/2/builds/12361 Here is the relevant piece of the build log for the reference |
|
LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/144/builds/13034 Here is the relevant piece of the build log for the reference |
|
LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/160/builds/9420 Here is the relevant piece of the build log for the reference |
rastogishubham
added a commit
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Dec 3, 2024
…7044)" This reverts commit 249755c. Broke https://lab.llvm.org/buildbot/#/builders/160/builds/9420 Note: This is test shard 99 of 154. [==========] Running 2 tests from 2 test suites. [----------] Global test environment set-up. [----------] 1 test from DroppedVariableStatsMIR [ RUN ] DroppedVariableStatsMIR.InlinedAt -- exit: -11
|
LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/140/builds/12216 Here is the relevant piece of the build log for the reference |
|
LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/180/builds/9418 Here is the relevant piece of the build log for the reference |
|
Please address #115566 (comment) before attempting another reland. |
rastogishubham
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Dec 19, 2024
I am trying to reland llvm#115566 I also moved the DroppedVariableStats code to the Analysis lib
rastogishubham
added a commit
to rastogishubham/llvm-project
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Dec 19, 2024
I am trying to reland llvm#115566 I also moved the DroppedVariableStats code to the Analysis lib
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Moved the MIR Test to the unittests/CodeGen folder
This is patch is part of a stack of patches, and follows #117042
I moved the MIR test to the unittests/CodeGen folder
I am trying to reland #115566