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7186dd4513
Originally committed in r211723, reverted in r211724 due to failure cases found and fixed (ArgumentPromotion: r211872, Inlining: r212065), and I now believe the invariant actually holds for some reasonable amount of code (but I'll keep an eye on the buildbots and see what happens... ). Original commit message: PR20038: DebugInfo: Inlined call sites where the caller has debug info but the call itself has no debug location. This situation does bad things when inlined, so I've fixed Clang not to produce inlinable call sites without locations when the caller has debug info (in the one case where I could find that this occurred). This updates the PR20038 test case to be what clang now produces, and readds the assertion that had to be removed due to this bug. I've also beefed up the debug info verifier to help diagnose these issues in the future, and I hope to add checks to the inliner to just assert-fail if it encounters this situation. If, in the future, we decide we have to cope with this situation, the right thing to do is probably to just remove all the DebugLocs from the inlined instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212085 91177308-0d34-0410-b5e6-96231b3b80d8
357 lines
12 KiB
C++
357 lines
12 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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/// 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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LexicalScopeMap.clear();
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AbstractScopeMap.clear();
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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 (const auto &MBB : *MF) {
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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 (const auto &MInsn : MBB) {
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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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LexicalScope *LexicalScopes::findInlinedScope(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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auto I = InlinedLexicalScopeMap.find(std::make_pair(Scope, IA));
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return I != InlinedLexicalScopeMap.end() ? &I->second : nullptr;
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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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auto I = InlinedLexicalScopeMap.find(std::make_pair(Scope, IA));
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return I != InlinedLexicalScopeMap.end() ? &I->second : nullptr;
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}
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return findLexicalScope(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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if (DL.isUnknown())
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return nullptr;
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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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auto I = LexicalScopeMap.find(Scope);
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if (I != LexicalScopeMap.end())
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return &I->second;
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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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// FIXME: Use forward_as_tuple instead of make_tuple, once MSVC2012
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// compatibility is no longer required.
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I = LexicalScopeMap.emplace(std::piecewise_construct, std::make_tuple(Scope),
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std::make_tuple(Parent, DIDescriptor(Scope),
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nullptr, false)).first;
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if (!Parent) {
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assert(DIDescriptor(Scope).isSubprogram());
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assert(DISubprogram(Scope).describes(MF->getFunction()));
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assert(!CurrentFnLexicalScope);
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CurrentFnLexicalScope = &I->second;
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}
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return &I->second;
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}
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/// getOrCreateInlinedScope - Find or create an inlined lexical scope.
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LexicalScope *LexicalScopes::getOrCreateInlinedScope(MDNode *ScopeNode,
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MDNode *InlinedAt) {
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std::pair<const MDNode*, const MDNode*> P(ScopeNode, InlinedAt);
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auto I = InlinedLexicalScopeMap.find(P);
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if (I != InlinedLexicalScopeMap.end())
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return &I->second;
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LexicalScope *Parent;
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DILexicalBlock Scope(ScopeNode);
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if (Scope.isSubprogram())
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Parent = getOrCreateLexicalScope(DebugLoc::getFromDILocation(InlinedAt));
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else
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Parent = getOrCreateInlinedScope(Scope.getContext(), InlinedAt);
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// FIXME: Use forward_as_tuple instead of make_tuple, once MSVC2012
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// compatibility is no longer required.
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I = InlinedLexicalScopeMap.emplace(std::piecewise_construct,
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std::make_tuple(P),
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std::make_tuple(Parent, Scope, InlinedAt,
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false)).first;
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return &I->second;
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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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auto I = AbstractScopeMap.find(Scope);
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if (I != AbstractScopeMap.end())
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return &I->second;
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LexicalScope *Parent = nullptr;
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if (Scope.isLexicalBlock()) {
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DILexicalBlock DB(Scope);
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DIDescriptor ParentDesc = DB.getContext();
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Parent = getOrCreateAbstractScope(ParentDesc);
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}
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I = AbstractScopeMap.emplace(std::piecewise_construct,
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std::forward_as_tuple(Scope),
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std::forward_as_tuple(Parent, Scope,
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nullptr, true)).first;
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if (Scope.isSubprogram())
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AbstractScopesList.push_back(&I->second);
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return &I->second;
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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 (const auto &MBB : *MF)
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MBBs.insert(&MBB);
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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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