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+//===- LexicalScopes.cpp - Collecting lexical scope info --------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements LexicalScopes analysis.
+//
+// This pass collects lexical scope information and maps machine instructions
+// to respective lexical scopes.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_LEXICALSCOPES_H
+#define LLVM_CODEGEN_LEXICALSCOPES_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/IR/DebugInfoMetadata.h"
+#include <cassert>
+#include <unordered_map>
+#include <utility>
+
+namespace llvm {
+
+class MachineBasicBlock;
+class MachineFunction;
+class MachineInstr;
+class MDNode;
+
+//===----------------------------------------------------------------------===//
+/// InsnRange - This is used to track range of instructions with identical
+/// lexical scope.
+///
+using InsnRange = std::pair<const MachineInstr *, const MachineInstr *>;
+
+//===----------------------------------------------------------------------===//
+/// LexicalScope - This class is used to track scope information.
+///
+class LexicalScope {
+public:
+ LexicalScope(LexicalScope *P, const DILocalScope *D, const DILocation *I,
+ bool A)
+ : Parent(P), Desc(D), InlinedAtLocation(I), AbstractScope(A) {
+ assert(D);
+ assert(D->getSubprogram()->getUnit()->getEmissionKind() !=
+ DICompileUnit::NoDebug &&
+ "Don't build lexical scopes for non-debug locations");
+ assert(D->isResolved() && "Expected resolved node");
+ assert((!I || I->isResolved()) && "Expected resolved node");
+ if (Parent)
+ Parent->addChild(this);
+ }
+
+ // Accessors.
+ LexicalScope *getParent() const { return Parent; }
+ const MDNode *getDesc() const { return Desc; }
+ const DILocation *getInlinedAt() const { return InlinedAtLocation; }
+ const DILocalScope *getScopeNode() const { return Desc; }
+ bool isAbstractScope() const { return AbstractScope; }
+ SmallVectorImpl<LexicalScope *> &getChildren() { return Children; }
+ SmallVectorImpl<InsnRange> &getRanges() { return Ranges; }
+
+ /// addChild - Add a child scope.
+ void addChild(LexicalScope *S) { Children.push_back(S); }
+
+ /// openInsnRange - This scope covers instruction range starting from MI.
+ void openInsnRange(const MachineInstr *MI) {
+ if (!FirstInsn)
+ FirstInsn = MI;
+
+ if (Parent)
+ Parent->openInsnRange(MI);
+ }
+
+ /// extendInsnRange - Extend the current instruction range covered by
+ /// this scope.
+ void extendInsnRange(const MachineInstr *MI) {
+ assert(FirstInsn && "MI Range is not open!");
+ LastInsn = MI;
+ if (Parent)
+ Parent->extendInsnRange(MI);
+ }
+
+ /// closeInsnRange - Create a range based on FirstInsn and LastInsn collected
+ /// until now. This is used when a new scope is encountered while walking
+ /// machine instructions.
+ void closeInsnRange(LexicalScope *NewScope = nullptr) {
+ assert(LastInsn && "Last insn missing!");
+ Ranges.push_back(InsnRange(FirstInsn, LastInsn));
+ FirstInsn = nullptr;
+ LastInsn = nullptr;
+ // If Parent dominates NewScope then do not close Parent's instruction
+ // range.
+ if (Parent && (!NewScope || !Parent->dominates(NewScope)))
+ Parent->closeInsnRange(NewScope);
+ }
+
+ /// dominates - Return true if current scope dominates given lexical scope.
+ bool dominates(const LexicalScope *S) const {
+ if (S == this)
+ return true;
+ if (DFSIn < S->getDFSIn() && DFSOut > S->getDFSOut())
+ return true;
+ return false;
+ }
+
+ // Depth First Search support to walk and manipulate LexicalScope hierarchy.
+ unsigned getDFSOut() const { return DFSOut; }
+ void setDFSOut(unsigned O) { DFSOut = O; }
+ unsigned getDFSIn() const { return DFSIn; }
+ void setDFSIn(unsigned I) { DFSIn = I; }
+
+ /// dump - print lexical scope.
+ void dump(unsigned Indent = 0) const;
+
+private:
+ LexicalScope *Parent; // Parent to this scope.
+ const DILocalScope *Desc; // Debug info descriptor.
+ const DILocation *InlinedAtLocation; // Location at which this
+ // scope is inlined.
+ bool AbstractScope; // Abstract Scope
+ SmallVector<LexicalScope *, 4> Children; // Scopes defined in scope.
+ // Contents not owned.
+ SmallVector<InsnRange, 4> Ranges;
+
+ const MachineInstr *LastInsn = nullptr; // Last instruction of this scope.
+ const MachineInstr *FirstInsn = nullptr; // First instruction of this scope.
+ unsigned DFSIn = 0; // In & Out Depth use to determine scope nesting.
+ unsigned DFSOut = 0;
+};
+
+//===----------------------------------------------------------------------===//
+/// LexicalScopes - This class provides interface to collect and use lexical
+/// scoping information from machine instruction.
+///
+class LexicalScopes {
+public:
+ LexicalScopes() = default;
+
+ /// initialize - Scan machine function and constuct lexical scope nest, resets
+ /// the instance if necessary.
+ void initialize(const MachineFunction &);
+
+ /// releaseMemory - release memory.
+ void reset();
+
+ /// empty - Return true if there is any lexical scope information available.
+ bool empty() { return CurrentFnLexicalScope == nullptr; }
+
+ /// getCurrentFunctionScope - Return lexical scope for the current function.
+ LexicalScope *getCurrentFunctionScope() const {
+ return CurrentFnLexicalScope;
+ }
+
+ /// getMachineBasicBlocks - Populate given set using machine basic blocks
+ /// which have machine instructions that belong to lexical scope identified by
+ /// DebugLoc.
+ void getMachineBasicBlocks(const DILocation *DL,
+ SmallPtrSetImpl<const MachineBasicBlock *> &MBBs);
+
+ /// dominates - Return true if DebugLoc's lexical scope dominates at least one
+ /// machine instruction's lexical scope in a given machine basic block.
+ bool dominates(const DILocation *DL, MachineBasicBlock *MBB);
+
+ /// findLexicalScope - Find lexical scope, either regular or inlined, for the
+ /// given DebugLoc. Return NULL if not found.
+ LexicalScope *findLexicalScope(const DILocation *DL);
+
+ /// getAbstractScopesList - Return a reference to list of abstract scopes.
+ ArrayRef<LexicalScope *> getAbstractScopesList() const {
+ return AbstractScopesList;
+ }
+
+ /// findAbstractScope - Find an abstract scope or return null.
+ LexicalScope *findAbstractScope(const DILocalScope *N) {
+ auto I = AbstractScopeMap.find(N);
+ return I != AbstractScopeMap.end() ? &I->second : nullptr;
+ }
+
+ /// findInlinedScope - Find an inlined scope for the given scope/inlined-at.
+ LexicalScope *findInlinedScope(const DILocalScope *N, const DILocation *IA) {
+ auto I = InlinedLexicalScopeMap.find(std::make_pair(N, IA));
+ return I != InlinedLexicalScopeMap.end() ? &I->second : nullptr;
+ }
+
+ /// findLexicalScope - Find regular lexical scope or return null.
+ LexicalScope *findLexicalScope(const DILocalScope *N) {
+ auto I = LexicalScopeMap.find(N);
+ return I != LexicalScopeMap.end() ? &I->second : nullptr;
+ }
+
+ /// dump - Print data structures to dbgs().
+ void dump() const;
+
+ /// getOrCreateAbstractScope - Find or create an abstract lexical scope.
+ LexicalScope *getOrCreateAbstractScope(const DILocalScope *Scope);
+
+private:
+ /// getOrCreateLexicalScope - Find lexical scope for the given Scope/IA. If
+ /// not available then create new lexical scope.
+ LexicalScope *getOrCreateLexicalScope(const DILocalScope *Scope,
+ const DILocation *IA = nullptr);
+ LexicalScope *getOrCreateLexicalScope(const DILocation *DL) {
+ return DL ? getOrCreateLexicalScope(DL->getScope(), DL->getInlinedAt())
+ : nullptr;
+ }
+
+ /// getOrCreateRegularScope - Find or create a regular lexical scope.
+ LexicalScope *getOrCreateRegularScope(const DILocalScope *Scope);
+
+ /// getOrCreateInlinedScope - Find or create an inlined lexical scope.
+ LexicalScope *getOrCreateInlinedScope(const DILocalScope *Scope,
+ const DILocation *InlinedAt);
+
+ /// extractLexicalScopes - Extract instruction ranges for each lexical scopes
+ /// for the given machine function.
+ void extractLexicalScopes(SmallVectorImpl<InsnRange> &MIRanges,
+ DenseMap<const MachineInstr *, LexicalScope *> &M);
+ void constructScopeNest(LexicalScope *Scope);
+ void
+ assignInstructionRanges(SmallVectorImpl<InsnRange> &MIRanges,
+ DenseMap<const MachineInstr *, LexicalScope *> &M);
+
+ const MachineFunction *MF = nullptr;
+
+ /// LexicalScopeMap - Tracks the scopes in the current function.
+ // Use an unordered_map to ensure value pointer validity over insertion.
+ std::unordered_map<const DILocalScope *, LexicalScope> LexicalScopeMap;
+
+ /// InlinedLexicalScopeMap - Tracks inlined function scopes in current
+ /// function.
+ std::unordered_map<std::pair<const DILocalScope *, const DILocation *>,
+ LexicalScope,
+ pair_hash<const DILocalScope *, const DILocation *>>
+ InlinedLexicalScopeMap;
+
+ /// AbstractScopeMap - These scopes are not included LexicalScopeMap.
+ // Use an unordered_map to ensure value pointer validity over insertion.
+ std::unordered_map<const DILocalScope *, LexicalScope> AbstractScopeMap;
+
+ /// AbstractScopesList - Tracks abstract scopes constructed while processing
+ /// a function.
+ SmallVector<LexicalScope *, 4> AbstractScopesList;
+
+ /// CurrentFnLexicalScope - Top level scope for the current function.
+ ///
+ LexicalScope *CurrentFnLexicalScope = nullptr;
+};
+
+} // end namespace llvm
+
+#endif // LLVM_CODEGEN_LEXICALSCOPES_H