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Provide utility to extract and use lexical scoping information from machine instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137237 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
parent
8533ebad6f
commit
103b8e653c
247
include/llvm/CodeGen/LexicalScopes.h
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247
include/llvm/CodeGen/LexicalScopes.h
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@ -0,0 +1,247 @@
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//===- LexicalScopes.cpp - Collecting lexical scope info -*- C++ -*--------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements LexicalScopes analysis.
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//
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// This pass collects lexical scope information and maps machine instructions
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// to respective lexical scopes.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_LEXICALSCOPES_H
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#define LLVM_CODEGEN_LEXICALSCOPES_H
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#include "llvm/Metadata.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/DebugLoc.h"
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#include "llvm/Support/ValueHandle.h"
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#include <utility>
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namespace llvm {
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class MachineInstr;
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class MachineBasicBlock;
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class MachineFunction;
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class LexicalScope;
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//===----------------------------------------------------------------------===//
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/// InsnRange - This is used to track range of instructions with identical
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/// lexical scope.
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///
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typedef std::pair<const MachineInstr *, const MachineInstr *> InsnRange;
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//===----------------------------------------------------------------------===//
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/// LexicalScopes - This class provides interface to collect and use lexical
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/// scoping information from machine instruction.
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///
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class LexicalScopes {
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public:
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LexicalScopes() : MF(NULL), CurrentFnLexicalScope(NULL) { }
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~LexicalScopes();
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/// initialize - Scan machine function and constuct lexical scope nest.
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virtual void initialize(const MachineFunction &);
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/// releaseMemory - release memory.
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virtual void releaseMemory();
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/// empty - Return true if there is any lexical scope information available.
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bool empty() { return CurrentFnLexicalScope == NULL; }
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/// isCurrentFunctionScope - Return true if given lexical scope represents
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/// current function.
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bool isCurrentFunctionScope(const LexicalScope *LS) {
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return LS == CurrentFnLexicalScope;
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}
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/// getCurrentFunctionScope - Return lexical scope for the current function.
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LexicalScope *getCurrentFunctionScope() const { return CurrentFnLexicalScope;}
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/// getMachineBasicBlocks - Populate given set using machine basic blocks which
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/// have machine instructions that belong to lexical scope identified by
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/// DebugLoc.
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void getMachineBasicBlocks(DebugLoc DL,
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SmallPtrSet<const MachineBasicBlock*, 4> &MBBs);
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/// dominates - Return true if DebugLoc's lexical scope dominates at least one
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/// machine instruction's lexical scope in a given machine basic block.
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bool dominates(DebugLoc DL, MachineBasicBlock *MBB);
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/// findLexicalScope - Find lexical scope, either regular or inlined, for the
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/// given DebugLoc. Return NULL if not found.
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LexicalScope *findLexicalScope(DebugLoc DL);
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/// getAbstractScopesList - Return a reference to list of abstract scopes.
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SmallVector<LexicalScope *, 4> &getAbstractScopesList() {
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return AbstractScopesList;
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}
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/// findAbstractScope - Find an abstract scope or return NULL.
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LexicalScope *findAbstractScope(const MDNode *N) {
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return AbstractScopeMap.lookup(N);
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}
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/// findInlinedScope - Find an inlined scope for the given DebugLoc or return
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/// NULL.
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LexicalScope *findInlinedScope(DebugLoc DL) {
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return InlinedLexicalScopeMap.lookup(DL);
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}
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/// findLexicalScope - Find regular lexical scope or return NULL.
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LexicalScope *findLexicalScope(const MDNode *N) {
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return LexicalScopeMap.lookup(N);
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}
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/// dump - Print data structures to dbgs().
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void dump();
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private:
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/// getOrCreateLexicalScope - Find lexical scope for the given DebugLoc. If
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/// not available then create new lexical scope.
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LexicalScope *getOrCreateLexicalScope(DebugLoc DL);
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/// getOrCreateRegularScope - Find or create a regular lexical scope.
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LexicalScope *getOrCreateRegularScope(MDNode *Scope);
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/// getOrCreateInlinedScope - Find or create an inlined lexical scope.
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LexicalScope *getOrCreateInlinedScope(MDNode *Scope, MDNode *InlinedAt);
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/// getOrCreateAbstractScope - Find or create an abstract lexical scope.
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LexicalScope *getOrCreateAbstractScope(const MDNode *N);
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/// extractLexicalScopes - Extract instruction ranges for each lexical scopes
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/// for the given machine function.
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void extractLexicalScopes(SmallVectorImpl<InsnRange> &MIRanges,
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DenseMap<const MachineInstr *, LexicalScope *> &M);
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void constructScopeNest(LexicalScope *Scope);
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void assignInstructionRanges(SmallVectorImpl<InsnRange> &MIRanges,
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DenseMap<const MachineInstr *, LexicalScope *> &M);
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private:
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const MachineFunction *MF;
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/// LexicalScopeMap - Tracks the scopes in the current function. Owns the
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/// contained LexicalScope*s.
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DenseMap<const MDNode *, LexicalScope *> LexicalScopeMap;
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/// InlinedLexicalScopeMap - Tracks inlined function scopes in current function.
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DenseMap<DebugLoc, LexicalScope *> InlinedLexicalScopeMap;
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/// AbstractScopeMap - These scopes are not included LexicalScopeMap.
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/// AbstractScopes owns its LexicalScope*s.
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DenseMap<const MDNode *, LexicalScope *> AbstractScopeMap;
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/// AbstractScopesList - Tracks abstract scopes constructed while processing
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/// a function.
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SmallVector<LexicalScope *, 4>AbstractScopesList;
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/// CurrentFnLexicalScope - Top level scope for the current function.
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///
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LexicalScope *CurrentFnLexicalScope;
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};
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//===----------------------------------------------------------------------===//
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/// LexicalScope - This class is used to track scope information.
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///
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class LexicalScope {
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public:
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LexicalScope(LexicalScope *P, const MDNode *D, const MDNode *I, bool A)
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: Parent(P), Desc(D), InlinedAtLocation(I), AbstractScope(A),
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LastInsn(0), FirstInsn(0), DFSIn(0), DFSOut(0), IndentLevel(0) {
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if (Parent)
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Parent->addChild(this);
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}
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virtual ~LexicalScope() {}
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// Accessors.
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LexicalScope *getParent() const { return Parent; }
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const MDNode *getDesc() const { return Desc; }
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const MDNode *getInlinedAt() const { return InlinedAtLocation; }
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const MDNode *getScopeNode() const { return Desc; }
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bool isAbstractScope() const { return AbstractScope; }
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SmallVector<LexicalScope *, 4> &getChildren() { return Children; }
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SmallVector<InsnRange, 4> &getRanges() { return Ranges; }
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/// addChild - Add a child scope.
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void addChild(LexicalScope *S) { Children.push_back(S); }
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/// openInsnRange - This scope covers instruction range starting from MI.
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void openInsnRange(const MachineInstr *MI) {
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if (!FirstInsn)
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FirstInsn = MI;
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if (Parent)
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Parent->openInsnRange(MI);
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}
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/// extendInsnRange - Extend the current instruction range covered by
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/// this scope.
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void extendInsnRange(const MachineInstr *MI) {
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assert (FirstInsn && "MI Range is not open!");
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LastInsn = MI;
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if (Parent)
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Parent->extendInsnRange(MI);
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}
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/// closeInsnRange - Create a range based on FirstInsn and LastInsn collected
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/// until now. This is used when a new scope is encountered while walking
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/// machine instructions.
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void closeInsnRange(LexicalScope *NewScope = NULL) {
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assert (LastInsn && "Last insn missing!");
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Ranges.push_back(InsnRange(FirstInsn, LastInsn));
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FirstInsn = NULL;
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LastInsn = NULL;
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// If Parent dominates NewScope then do not close Parent's instruction
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// range.
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if (Parent && (!NewScope || !Parent->dominates(NewScope)))
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Parent->closeInsnRange(NewScope);
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}
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/// dominates - Return true if current scope dominsates given lexical scope.
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bool dominates(const LexicalScope *S) {
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if (S == this)
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return true;
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if (DFSIn < S->getDFSIn() && DFSOut > S->getDFSOut())
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return true;
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return false;
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}
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// Depth First Search support to walk and manipulate LexicalScope hierarchy.
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unsigned getDFSOut() const { return DFSOut; }
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void setDFSOut(unsigned O) { DFSOut = O; }
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unsigned getDFSIn() const { return DFSIn; }
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void setDFSIn(unsigned I) { DFSIn = I; }
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/// dump - print lexical scope.
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void dump() const;
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private:
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LexicalScope *Parent; // Parent to this scope.
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AssertingVH<const MDNode> Desc; // Debug info descriptor.
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AssertingVH<const MDNode> InlinedAtLocation; // Location at which this
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// scope is inlined.
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bool AbstractScope; // Abstract Scope
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SmallVector<LexicalScope *, 4> Children; // Scopes defined in scope.
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// Contents not owned.
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SmallVector<InsnRange, 4> Ranges;
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const MachineInstr *LastInsn; // Last instruction of this scope.
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const MachineInstr *FirstInsn; // First instruction of this scope.
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unsigned DFSIn, DFSOut; // In & Out Depth use to determine
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// scope nesting.
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mutable unsigned IndentLevel; // Private state for dump()
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};
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} // end llvm namespace
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#endif
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@ -23,6 +23,7 @@ add_llvm_library(LLVMCodeGen
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IntrinsicLowering.cpp
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LLVMTargetMachine.cpp
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LatencyPriorityQueue.cpp
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LexicalScopes.cpp
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LiveDebugVariables.cpp
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LiveInterval.cpp
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LiveIntervalAnalysis.cpp
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305
lib/CodeGen/LexicalScopes.cpp
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305
lib/CodeGen/LexicalScopes.cpp
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@ -0,0 +1,305 @@
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//===- LexicalScopes.cpp - Collecting lexical scope info ------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements LexicalScopes analysis.
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//
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// This pass collects lexical scope information and maps machine instructions
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// to respective lexical scopes.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "lexicalscopes"
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#include "llvm/CodeGen/LexicalScopes.h"
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#include "llvm/Function.h"
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#include "llvm/Analysis/DebugInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/FormattedStream.h"
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using namespace llvm;
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LexicalScopes::~LexicalScopes() {
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releaseMemory();
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}
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/// releaseMemory - release memory.
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void LexicalScopes::releaseMemory() {
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MF = NULL;
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CurrentFnLexicalScope = NULL;
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DeleteContainerSeconds(LexicalScopeMap);
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DeleteContainerSeconds(AbstractScopeMap);
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InlinedLexicalScopeMap.clear();
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AbstractScopesList.clear();
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}
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/// initialize - Scan machine function and constuct lexical scope nest.
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void LexicalScopes::initialize(const MachineFunction &Fn) {
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releaseMemory();
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MF = &Fn;
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SmallVector<InsnRange, 4> MIRanges;
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DenseMap<const MachineInstr *, LexicalScope *> MI2ScopeMap;
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extractLexicalScopes(MIRanges, MI2ScopeMap);
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if (CurrentFnLexicalScope) {
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constructScopeNest(CurrentFnLexicalScope);
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assignInstructionRanges(MIRanges, MI2ScopeMap);
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}
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}
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/// extractLexicalScopes - Extract instruction ranges for each lexical scopes
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/// for the given machine function.
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void LexicalScopes::
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extractLexicalScopes(SmallVectorImpl<InsnRange> &MIRanges,
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DenseMap<const MachineInstr *, LexicalScope *> &MI2ScopeMap) {
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// Scan each instruction and create scopes. First build working set of scopes.
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for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
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I != E; ++I) {
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const MachineInstr *RangeBeginMI = NULL;
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const MachineInstr *PrevMI = NULL;
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DebugLoc PrevDL;
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for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
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II != IE; ++II) {
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const MachineInstr *MInsn = II;
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// Check if instruction has valid location information.
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const DebugLoc MIDL = MInsn->getDebugLoc();
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if (MIDL.isUnknown()) {
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PrevMI = MInsn;
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continue;
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}
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// If scope has not changed then skip this instruction.
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if (MIDL == PrevDL) {
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PrevMI = MInsn;
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continue;
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}
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// Ignore DBG_VALUE. It does not contribute to any instruction in output.
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if (MInsn->isDebugValue())
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continue;
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if (RangeBeginMI) {
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// If we have already seen a beginning of an instruction range and
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// current instruction scope does not match scope of first instruction
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// in this range then create a new instruction range.
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InsnRange R(RangeBeginMI, PrevMI);
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MI2ScopeMap[RangeBeginMI] = getOrCreateLexicalScope(PrevDL);
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MIRanges.push_back(R);
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}
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// This is a beginning of a new instruction range.
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RangeBeginMI = MInsn;
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// Reset previous markers.
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PrevMI = MInsn;
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PrevDL = MIDL;
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}
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// Create last instruction range.
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if (RangeBeginMI && PrevMI && !PrevDL.isUnknown()) {
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InsnRange R(RangeBeginMI, PrevMI);
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MIRanges.push_back(R);
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MI2ScopeMap[RangeBeginMI] = getOrCreateLexicalScope(PrevDL);
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}
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}
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}
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/// findLexicalScope - Find lexical scope, either regular or inlined, for the
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/// given DebugLoc. Return NULL if not found.
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LexicalScope *LexicalScopes::findLexicalScope(DebugLoc DL) {
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MDNode *Scope = NULL;
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MDNode *IA = NULL;
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DL.getScopeAndInlinedAt(Scope, IA, MF->getFunction()->getContext());
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if (!Scope) return NULL;
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if (IA)
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return InlinedLexicalScopeMap.lookup(DebugLoc::getFromDILocation(IA));
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return LexicalScopeMap.lookup(DL.getScope(Scope->getContext()));
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}
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/// getOrCreateLexicalScope - Find lexical scope for the given DebugLoc. If
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/// not available then create new lexical scope.
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LexicalScope *LexicalScopes::getOrCreateLexicalScope(DebugLoc DL) {
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MDNode *Scope = NULL;
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MDNode *InlinedAt = NULL;
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DL.getScopeAndInlinedAt(Scope, InlinedAt, MF->getFunction()->getContext());
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if (InlinedAt) {
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// Create an abstract scope for inlined function.
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getOrCreateAbstractScope(Scope);
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// Create an inlined scope for inlined function.
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return getOrCreateInlinedScope(Scope, InlinedAt);
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}
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return getOrCreateRegularScope(Scope);
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}
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/// getOrCreateRegularScope - Find or create a regular lexical scope.
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LexicalScope *LexicalScopes::getOrCreateRegularScope(MDNode *Scope) {
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LexicalScope *WScope = LexicalScopeMap.lookup(Scope);
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if (WScope)
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return WScope;
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LexicalScope *Parent = NULL;
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if (DIDescriptor(Scope).isLexicalBlock())
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Parent = getOrCreateLexicalScope(DebugLoc::getFromDILexicalBlock(Scope));
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WScope = new LexicalScope(Parent, DIDescriptor(Scope), NULL, false);
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LexicalScopeMap.insert(std::make_pair(Scope, WScope));
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if (!Parent && DIDescriptor(Scope).isSubprogram()
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&& DISubprogram(Scope).describes(MF->getFunction()))
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CurrentFnLexicalScope = WScope;
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return WScope;
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}
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/// getOrCreateInlinedScope - Find or create an inlined lexical scope.
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LexicalScope *LexicalScopes::getOrCreateInlinedScope(MDNode *Scope,
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MDNode *InlinedAt) {
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LexicalScope *InlinedScope = LexicalScopeMap.lookup(InlinedAt);
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if (InlinedScope)
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return InlinedScope;
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DebugLoc InlinedLoc = DebugLoc::getFromDILocation(InlinedAt);
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InlinedScope = new LexicalScope(getOrCreateLexicalScope(InlinedLoc),
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DIDescriptor(Scope), InlinedAt, false);
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InlinedLexicalScopeMap[InlinedLoc] = InlinedScope;
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LexicalScopeMap[InlinedAt] = InlinedScope;
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return InlinedScope;
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}
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/// getOrCreateAbstractScope - Find or create an abstract lexical scope.
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LexicalScope *LexicalScopes::getOrCreateAbstractScope(const MDNode *N) {
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assert(N && "Invalid Scope encoding!");
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LexicalScope *AScope = AbstractScopeMap.lookup(N);
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if (AScope)
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return AScope;
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LexicalScope *Parent = NULL;
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DIDescriptor Scope(N);
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if (Scope.isLexicalBlock()) {
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DILexicalBlock DB(N);
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DIDescriptor ParentDesc = DB.getContext();
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Parent = getOrCreateAbstractScope(ParentDesc);
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}
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AScope = new LexicalScope(Parent, DIDescriptor(N), NULL, true);
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AbstractScopeMap[N] = AScope;
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if (DIDescriptor(N).isSubprogram())
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AbstractScopesList.push_back(AScope);
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return AScope;
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}
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/// constructScopeNest
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void LexicalScopes::constructScopeNest(LexicalScope *Scope) {
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assert (Scope && "Unable to calculate scop edominance graph!");
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SmallVector<LexicalScope *, 4> WorkStack;
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WorkStack.push_back(Scope);
|
||||
unsigned Counter = 0;
|
||||
while (!WorkStack.empty()) {
|
||||
LexicalScope *WS = WorkStack.back();
|
||||
const SmallVector<LexicalScope *, 4> &Children = WS->getChildren();
|
||||
bool visitedChildren = false;
|
||||
for (SmallVector<LexicalScope *, 4>::const_iterator SI = Children.begin(),
|
||||
SE = Children.end(); SI != SE; ++SI) {
|
||||
LexicalScope *ChildScope = *SI;
|
||||
if (!ChildScope->getDFSOut()) {
|
||||
WorkStack.push_back(ChildScope);
|
||||
visitedChildren = true;
|
||||
ChildScope->setDFSIn(++Counter);
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (!visitedChildren) {
|
||||
WorkStack.pop_back();
|
||||
WS->setDFSOut(++Counter);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// assignInstructionRanges - Find ranges of instructions covered by each lexical
|
||||
/// scope.
|
||||
void LexicalScopes::
|
||||
assignInstructionRanges(SmallVectorImpl<InsnRange> &MIRanges,
|
||||
DenseMap<const MachineInstr *, LexicalScope *> &MI2ScopeMap) {
|
||||
|
||||
LexicalScope *PrevLexicalScope = NULL;
|
||||
for (SmallVectorImpl<InsnRange>::const_iterator RI = MIRanges.begin(),
|
||||
RE = MIRanges.end(); RI != RE; ++RI) {
|
||||
const InsnRange &R = *RI;
|
||||
LexicalScope *S = MI2ScopeMap.lookup(R.first);
|
||||
assert (S && "Lost LexicalScope for a machine instruction!");
|
||||
if (PrevLexicalScope && !PrevLexicalScope->dominates(S))
|
||||
PrevLexicalScope->closeInsnRange(S);
|
||||
S->openInsnRange(R.first);
|
||||
S->extendInsnRange(R.second);
|
||||
PrevLexicalScope = S;
|
||||
}
|
||||
|
||||
if (PrevLexicalScope)
|
||||
PrevLexicalScope->closeInsnRange();
|
||||
}
|
||||
|
||||
/// getMachineBasicBlocks - Populate given set using machine basic blocks which
|
||||
/// have machine instructions that belong to lexical scope identified by
|
||||
/// DebugLoc.
|
||||
void LexicalScopes::
|
||||
getMachineBasicBlocks(DebugLoc DL, SmallPtrSet<const MachineBasicBlock*, 4> &MBBs) {
|
||||
MBBs.clear();
|
||||
LexicalScope *Scope = getOrCreateLexicalScope(DL);
|
||||
if (!Scope)
|
||||
return;
|
||||
|
||||
SmallVector<InsnRange, 4> &InsnRanges = Scope->getRanges();
|
||||
for (SmallVector<InsnRange, 4>::iterator I = InsnRanges.begin(),
|
||||
E = InsnRanges.end(); I != E; ++I) {
|
||||
InsnRange &R = *I;
|
||||
MBBs.insert(R.first->getParent());
|
||||
}
|
||||
}
|
||||
|
||||
/// dominates - Return true if DebugLoc's lexical scope dominates at least one
|
||||
/// machine instruction's lexical scope in a given machine basic block.
|
||||
bool LexicalScopes::dominates(DebugLoc DL, MachineBasicBlock *MBB) {
|
||||
LexicalScope *Scope = getOrCreateLexicalScope(DL);
|
||||
if (!Scope)
|
||||
return false;
|
||||
bool Result = false;
|
||||
for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end();
|
||||
I != E; ++I) {
|
||||
DebugLoc IDL = I->getDebugLoc();
|
||||
if (IDL.isUnknown())
|
||||
continue;
|
||||
if (LexicalScope *IScope = getOrCreateLexicalScope(IDL))
|
||||
if (Scope->dominates(IScope))
|
||||
return true;
|
||||
}
|
||||
return Result;
|
||||
}
|
||||
|
||||
/// dump - Print data structures.
|
||||
void LexicalScope::dump() const {
|
||||
#ifndef NDEBUG
|
||||
raw_ostream &err = dbgs();
|
||||
err.indent(IndentLevel);
|
||||
err << "DFSIn: " << DFSIn << " DFSOut: " << DFSOut << "\n";
|
||||
const MDNode *N = Desc;
|
||||
N->dump();
|
||||
if (AbstractScope)
|
||||
err << "Abstract Scope\n";
|
||||
|
||||
IndentLevel += 2;
|
||||
if (!Children.empty())
|
||||
err << "Children ...\n";
|
||||
for (unsigned i = 0, e = Children.size(); i != e; ++i)
|
||||
if (Children[i] != this)
|
||||
Children[i]->dump();
|
||||
|
||||
IndentLevel -= 2;
|
||||
#endif
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user