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define below all header includes in the lib/CodeGen/... tree. While the current modules implementation doesn't check for this kind of ODR violation yet, it is likely to grow support for it in the future. It also removes one layer of macro pollution across all the included headers. Other sub-trees will follow. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206837 91177308-0d34-0410-b5e6-96231b3b80d8
335 lines
11 KiB
C++
335 lines
11 KiB
C++
//===- 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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#include "llvm/CodeGen/LexicalScopes.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/IR/DebugInfo.h"
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#include "llvm/IR/Function.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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#define DEBUG_TYPE "lexicalscopes"
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/// ~LexicalScopes - final cleanup after ourselves.
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LexicalScopes::~LexicalScopes() { reset(); }
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/// reset - Reset the instance so that it's prepared for another function.
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void LexicalScopes::reset() {
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MF = nullptr;
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CurrentFnLexicalScope = nullptr;
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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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reset();
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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::extractLexicalScopes(
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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(); I != E;
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++I) {
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const MachineInstr *RangeBeginMI = nullptr;
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const MachineInstr *PrevMI = nullptr;
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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 = nullptr;
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MDNode *IA = nullptr;
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DL.getScopeAndInlinedAt(Scope, IA, MF->getFunction()->getContext());
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if (!Scope)
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return nullptr;
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// The scope that we were created with could have an extra file - which
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// isn't what we care about in this case.
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DIDescriptor D = DIDescriptor(Scope);
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if (D.isLexicalBlockFile())
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Scope = DILexicalBlockFile(Scope).getScope();
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if (IA)
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return InlinedLexicalScopeMap.lookup(DebugLoc::getFromDILocation(IA));
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return LexicalScopeMap.lookup(Scope);
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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 = nullptr;
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MDNode *InlinedAt = nullptr;
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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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DIDescriptor D = DIDescriptor(Scope);
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if (D.isLexicalBlockFile()) {
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Scope = DILexicalBlockFile(Scope).getScope();
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D = DIDescriptor(Scope);
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}
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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 = nullptr;
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if (D.isLexicalBlock())
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Parent = getOrCreateLexicalScope(DebugLoc::getFromDILexicalBlock(Scope));
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WScope = new LexicalScope(Parent, DIDescriptor(Scope), nullptr, 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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DIDescriptor Scope(N);
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if (Scope.isLexicalBlockFile())
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Scope = DILexicalBlockFile(Scope).getScope();
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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 = nullptr;
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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), nullptr, 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 scope dominance graph!");
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SmallVector<LexicalScope *, 4> WorkStack;
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WorkStack.push_back(Scope);
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unsigned Counter = 0;
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while (!WorkStack.empty()) {
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LexicalScope *WS = WorkStack.back();
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const SmallVectorImpl<LexicalScope *> &Children = WS->getChildren();
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bool visitedChildren = false;
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for (SmallVectorImpl<LexicalScope *>::const_iterator SI = Children.begin(),
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SE = Children.end();
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SI != SE; ++SI) {
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LexicalScope *ChildScope = *SI;
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if (!ChildScope->getDFSOut()) {
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WorkStack.push_back(ChildScope);
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visitedChildren = true;
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ChildScope->setDFSIn(++Counter);
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break;
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}
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}
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if (!visitedChildren) {
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WorkStack.pop_back();
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WS->setDFSOut(++Counter);
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}
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}
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}
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/// assignInstructionRanges - Find ranges of instructions covered by each
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/// lexical scope.
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void LexicalScopes::assignInstructionRanges(
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SmallVectorImpl<InsnRange> &MIRanges,
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DenseMap<const MachineInstr *, LexicalScope *> &MI2ScopeMap) {
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LexicalScope *PrevLexicalScope = nullptr;
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for (SmallVectorImpl<InsnRange>::const_iterator RI = MIRanges.begin(),
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RE = MIRanges.end();
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RI != RE; ++RI) {
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const InsnRange &R = *RI;
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LexicalScope *S = MI2ScopeMap.lookup(R.first);
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assert(S && "Lost LexicalScope for a machine instruction!");
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if (PrevLexicalScope && !PrevLexicalScope->dominates(S))
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PrevLexicalScope->closeInsnRange(S);
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S->openInsnRange(R.first);
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S->extendInsnRange(R.second);
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PrevLexicalScope = S;
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}
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if (PrevLexicalScope)
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PrevLexicalScope->closeInsnRange();
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}
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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 LexicalScopes::getMachineBasicBlocks(
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DebugLoc DL, SmallPtrSet<const MachineBasicBlock *, 4> &MBBs) {
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MBBs.clear();
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LexicalScope *Scope = getOrCreateLexicalScope(DL);
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if (!Scope)
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return;
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if (Scope == CurrentFnLexicalScope) {
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for (MachineFunction::const_iterator I = MF->begin(), E = MF->end(); I != E;
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++I)
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MBBs.insert(I);
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return;
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}
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SmallVectorImpl<InsnRange> &InsnRanges = Scope->getRanges();
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for (SmallVectorImpl<InsnRange>::iterator I = InsnRanges.begin(),
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E = InsnRanges.end();
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I != E; ++I) {
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InsnRange &R = *I;
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MBBs.insert(R.first->getParent());
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}
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}
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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 LexicalScopes::dominates(DebugLoc DL, MachineBasicBlock *MBB) {
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LexicalScope *Scope = getOrCreateLexicalScope(DL);
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if (!Scope)
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return false;
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// Current function scope covers all basic blocks in the function.
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if (Scope == CurrentFnLexicalScope && MBB->getParent() == MF)
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return true;
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bool Result = false;
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for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end(); I != E;
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++I) {
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DebugLoc IDL = I->getDebugLoc();
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if (IDL.isUnknown())
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continue;
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if (LexicalScope *IScope = getOrCreateLexicalScope(IDL))
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if (Scope->dominates(IScope))
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return true;
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}
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return Result;
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}
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/// dump - Print data structures.
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void LexicalScope::dump(unsigned Indent) const {
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#ifndef NDEBUG
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raw_ostream &err = dbgs();
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err.indent(Indent);
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err << "DFSIn: " << DFSIn << " DFSOut: " << DFSOut << "\n";
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const MDNode *N = Desc;
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err.indent(Indent);
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N->dump();
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if (AbstractScope)
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err << std::string(Indent, ' ') << "Abstract Scope\n";
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if (!Children.empty())
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err << std::string(Indent + 2, ' ') << "Children ...\n";
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for (unsigned i = 0, e = Children.size(); i != e; ++i)
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if (Children[i] != this)
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Children[i]->dump(Indent + 2);
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#endif
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}
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