Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty

1 files changed, 119 insertions, 0 deletions

diff --git a/gnu/llvm/clang/lib/CodeGen/CodeGenPGO.h b/gnu/llvm/clang/lib/CodeGen/CodeGenPGO.h
new file mode 100644
index 00000000000..a3778b54991
--- /dev/null
+++ b/gnu/llvm/clang/lib/CodeGen/CodeGenPGO.h
@@ -0,0 +1,119 @@
+//===--- CodeGenPGO.h - PGO Instrumentation for LLVM CodeGen ----*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Instrumentation-based profile-guided optimization
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_CODEGENPGO_H
+#define LLVM_CLANG_LIB_CODEGEN_CODEGENPGO_H
+
+#include "CGBuilder.h"
+#include "CodeGenModule.h"
+#include "CodeGenTypes.h"
+#include "llvm/ProfileData/InstrProfReader.h"
+#include <array>
+#include <memory>
+
+namespace clang {
+namespace CodeGen {
+
+/// Per-function PGO state.
+class CodeGenPGO {
+private:
+  CodeGenModule &CGM;
+  std::string FuncName;
+  llvm::GlobalVariable *FuncNameVar;
+
+  std::array <unsigned, llvm::IPVK_Last + 1> NumValueSites;
+  unsigned NumRegionCounters;
+  uint64_t FunctionHash;
+  std::unique_ptr<llvm::DenseMap<const Stmt *, unsigned>> RegionCounterMap;
+  std::unique_ptr<llvm::DenseMap<const Stmt *, uint64_t>> StmtCountMap;
+  std::unique_ptr<llvm::InstrProfRecord> ProfRecord;
+  std::vector<uint64_t> RegionCounts;
+  uint64_t CurrentRegionCount;
+
+public:
+  CodeGenPGO(CodeGenModule &CGM)
+      : CGM(CGM), FuncNameVar(nullptr), NumValueSites({{0}}),
+        NumRegionCounters(0), FunctionHash(0), CurrentRegionCount(0) {}
+
+  /// Whether or not we have PGO region data for the current function. This is
+  /// false both when we have no data at all and when our data has been
+  /// discarded.
+  bool haveRegionCounts() const { return !RegionCounts.empty(); }
+
+  /// Return the counter value of the current region.
+  uint64_t getCurrentRegionCount() const { return CurrentRegionCount; }
+
+  /// Set the counter value for the current region. This is used to keep track
+  /// of changes to the most recent counter from control flow and non-local
+  /// exits.
+  void setCurrentRegionCount(uint64_t Count) { CurrentRegionCount = Count; }
+
+  /// Check if an execution count is known for a given statement. If so, return
+  /// true and put the value in Count; else return false.
+  Optional<uint64_t> getStmtCount(const Stmt *S) {
+    if (!StmtCountMap)
+      return None;
+    auto I = StmtCountMap->find(S);
+    if (I == StmtCountMap->end())
+      return None;
+    return I->second;
+  }
+
+  /// If the execution count for the current statement is known, record that
+  /// as the current count.
+  void setCurrentStmt(const Stmt *S) {
+    if (auto Count = getStmtCount(S))
+      setCurrentRegionCount(*Count);
+  }
+
+  /// Assign counters to regions and configure them for PGO of a given
+  /// function. Does nothing if instrumentation is not enabled and either
+  /// generates global variables or associates PGO data with each of the
+  /// counters depending on whether we are generating or using instrumentation.
+  void assignRegionCounters(GlobalDecl GD, llvm::Function *Fn);
+  /// Emit a coverage mapping range with a counter zero
+  /// for an unused declaration.
+  void emitEmptyCounterMapping(const Decl *D, StringRef FuncName,
+                               llvm::GlobalValue::LinkageTypes Linkage);
+  // Insert instrumentation or attach profile metadata at value sites
+  void valueProfile(CGBuilderTy &Builder, uint32_t ValueKind,
+                    llvm::Instruction *ValueSite, llvm::Value *ValuePtr);
+private:
+  void setFuncName(llvm::Function *Fn);
+  void setFuncName(StringRef Name, llvm::GlobalValue::LinkageTypes Linkage);
+  void mapRegionCounters(const Decl *D);
+  void computeRegionCounts(const Decl *D);
+  void applyFunctionAttributes(llvm::IndexedInstrProfReader *PGOReader,
+                               llvm::Function *Fn);
+  void loadRegionCounts(llvm::IndexedInstrProfReader *PGOReader,
+                        bool IsInMainFile);
+  bool skipRegionMappingForDecl(const Decl *D);
+  void emitCounterRegionMapping(const Decl *D);
+
+public:
+  void emitCounterIncrement(CGBuilderTy &Builder, const Stmt *S,
+                            llvm::Value *StepV);
+
+  /// Return the region count for the counter at the given index.
+  uint64_t getRegionCount(const Stmt *S) {
+    if (!RegionCounterMap)
+      return 0;
+    if (!haveRegionCounts())
+      return 0;
+    return RegionCounts[(*RegionCounterMap)[S]];
+  }
+};
+
+}  // end namespace CodeGen
+}  // end namespace clang
+
+#endif