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DebugInfo: Remove some extra handling of abstract variables and instead rely solely on the delayed handling introduced in r210946

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Now that we handle finding abstract variables at the end of the module,
remove the upfront handling and just ensure the abstract variable is
built when necessary.

In theory we could have a split implementation, where inlined variables
are immediately constructed referencing the abstract definition, and
concrete variables are delayed - but let's go with one solution for now
unless there's a reason not to.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210961 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie 2014-06-13 23:52:55 +00:00
parent 53551e2476
commit d32eccc97b
2 changed files with 34 additions and 40 deletions
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42
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -865,7 +865,7 @@ void DwarfDebug::collectDeadVariables() {
for (unsigned vi = 0, ve = Variables.getNumElements(); vi != ve; ++vi) {
DIVariable DV(Variables.getElement(vi));
assert(DV.isVariable());
DbgVariable NewVar(DV, nullptr, this);
DbgVariable NewVar(DV, this);
auto VariableDie = SPCU->constructVariableDIE(NewVar);
SPCU->applyVariableAttributes(NewVar, *VariableDie);
SPDIE->addChild(std::move(VariableDie));
@ -1086,32 +1086,31 @@ DbgVariable *DwarfDebug::getExistingAbstractVariable(const DIVariable &DV) {
return getExistingAbstractVariable(DV, Cleansed);
}
DbgVariable *DwarfDebug::createAbstractVariable(DIVariable &Var,
void DwarfDebug::createAbstractVariable(const DIVariable &Var,
LexicalScope *Scope) {
auto AbsDbgVariable = make_unique<DbgVariable>(Var, nullptr, this);
auto AbsDbgVariable = make_unique<DbgVariable>(Var, this);
addScopeVariable(Scope, AbsDbgVariable.get());
return (AbstractVariables[Var] = std::move(AbsDbgVariable)).get();
AbstractVariables[Var] = std::move(AbsDbgVariable);
}
DbgVariable *DwarfDebug::getOrCreateAbstractVariable(DIVariable &DV,
void DwarfDebug::ensureAbstractVariableIsCreated(const DIVariable &DV,
const MDNode *ScopeNode) {
DIVariable Cleansed = DV;
if (DbgVariable *Var = getExistingAbstractVariable(DV, Cleansed))
return Var;
if (getExistingAbstractVariable(DV, Cleansed))
return;
return createAbstractVariable(Cleansed,
LScopes.getOrCreateAbstractScope(ScopeNode));
createAbstractVariable(Cleansed, LScopes.getOrCreateAbstractScope(ScopeNode));
}
DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &DV,
void
DwarfDebug::ensureAbstractVariableIsCreatedIfScoped(const DIVariable &DV,
const MDNode *ScopeNode) {
DIVariable Cleansed = DV;
if (DbgVariable *Var = getExistingAbstractVariable(DV, Cleansed))
return Var;
if (getExistingAbstractVariable(DV, Cleansed))
return;
if (LexicalScope *Scope = LScopes.findAbstractScope(ScopeNode))
return createAbstractVariable(Cleansed, Scope);
return nullptr;
createAbstractVariable(Cleansed, Scope);
}
// If Var is a current function argument then add it to CurrentFnArguments list.
@ -1150,9 +1149,8 @@ void DwarfDebug::collectVariableInfoFromMMITable(
if (!Scope)
continue;
DbgVariable *AbsDbgVariable =
findAbstractVariable(DV, Scope->getScopeNode());
ConcreteVariables.push_back(make_unique<DbgVariable>(DV, AbsDbgVariable, this));
ensureAbstractVariableIsCreatedIfScoped(DV, Scope->getScopeNode());
ConcreteVariables.push_back(make_unique<DbgVariable>(DV, this));
DbgVariable *RegVar = ConcreteVariables.back().get();
RegVar->setFrameIndex(VI.Slot);
addScopeVariable(Scope, RegVar);
@ -1220,8 +1218,8 @@ DwarfDebug::collectVariableInfo(SmallPtrSet<const MDNode *, 16> &Processed) {
Processed.insert(DV);
const MachineInstr *MInsn = Ranges.front().first;
assert(MInsn->isDebugValue() && "History must begin with debug value");
DbgVariable *AbsVar = findAbstractVariable(DV, Scope->getScopeNode());
ConcreteVariables.push_back(make_unique<DbgVariable>(MInsn, AbsVar, this));
ensureAbstractVariableIsCreatedIfScoped(DV, Scope->getScopeNode());
ConcreteVariables.push_back(make_unique<DbgVariable>(MInsn, this));
DbgVariable *RegVar = ConcreteVariables.back().get();
addScopeVariable(Scope, RegVar);
@ -1278,8 +1276,8 @@ DwarfDebug::collectVariableInfo(SmallPtrSet<const MDNode *, 16> &Processed) {
if (!Processed.insert(DV))
continue;
if (LexicalScope *Scope = LScopes.findLexicalScope(DV.getContext())) {
ConcreteVariables.push_back(make_unique<DbgVariable>(
DV, findAbstractVariable(DV, Scope->getScopeNode()), this));
ensureAbstractVariableIsCreatedIfScoped(DV, Scope->getScopeNode());
ConcreteVariables.push_back(make_unique<DbgVariable>(DV, this));
addScopeVariable(Scope, ConcreteVariables.back().get());
}
}
@ -1563,7 +1561,7 @@ void DwarfDebug::endFunction(const MachineFunction *MF) {
assert(DV && DV.isVariable());
if (!ProcessedVars.insert(DV))
continue;
getOrCreateAbstractVariable(DV, DV.getContext());
ensureAbstractVariableIsCreated(DV, DV.getContext());
}
constructAbstractSubprogramScopeDIE(TheCU, AScope);
}

24
lib/CodeGen/AsmPrinter/DwarfDebug.h
View File

@ -72,25 +72,21 @@ class DbgVariable {
DIVariable Var; // Variable Descriptor.
DIE *TheDIE; // Variable DIE.
unsigned DotDebugLocOffset; // Offset in DotDebugLocEntries.
DbgVariable *AbsVar; // Corresponding Abstract variable, if any.
const MachineInstr *MInsn; // DBG_VALUE instruction of the variable.
int FrameIndex;
DwarfDebug *DD;
public:
/// Construct a DbgVariable from a DIVariable.
/// AbstractVar may be NULL.
DbgVariable(DIVariable V, DbgVariable *AbstractVar, DwarfDebug *DD)
: Var(V), TheDIE(nullptr), DotDebugLocOffset(~0U), AbsVar(AbstractVar),
MInsn(nullptr), FrameIndex(~0), DD(DD) {}
DbgVariable(DIVariable V, DwarfDebug *DD)
: Var(V), TheDIE(nullptr), DotDebugLocOffset(~0U), MInsn(nullptr),
FrameIndex(~0), DD(DD) {}
/// Construct a DbgVariable from a DEBUG_VALUE.
/// AbstractVar may be NULL.
DbgVariable(const MachineInstr *DbgValue, DbgVariable *AbstractVar,
DwarfDebug *DD)
: Var(DbgValue->getDebugVariable()),
TheDIE(nullptr), DotDebugLocOffset(~0U), AbsVar(AbstractVar),
MInsn(DbgValue), FrameIndex(~0), DD(DD) {}
DbgVariable(const MachineInstr *DbgValue, DwarfDebug *DD)
: Var(DbgValue->getDebugVariable()), TheDIE(nullptr),
DotDebugLocOffset(~0U), MInsn(DbgValue), FrameIndex(~0), DD(DD) {}
// Accessors.
DIVariable getVariable() const { return Var; }
@ -99,7 +95,6 @@ public:
void setDotDebugLocOffset(unsigned O) { DotDebugLocOffset = O; }
unsigned getDotDebugLocOffset() const { return DotDebugLocOffset; }
StringRef getName() const { return Var.getName(); }
DbgVariable *getAbstractVariable() const { return AbsVar; }
const MachineInstr *getMInsn() const { return MInsn; }
int getFrameIndex() const { return FrameIndex; }
void setFrameIndex(int FI) { FrameIndex = FI; }
@ -347,10 +342,11 @@ class DwarfDebug : public AsmPrinterHandler {
DbgVariable *getExistingAbstractVariable(const DIVariable &DV,
DIVariable &Cleansed);
DbgVariable *getExistingAbstractVariable(const DIVariable &DV);
DbgVariable *createAbstractVariable(DIVariable &DV, LexicalScope *Scope);
DbgVariable *getOrCreateAbstractVariable(DIVariable &Var,
void createAbstractVariable(const DIVariable &DV, LexicalScope *Scope);
void ensureAbstractVariableIsCreated(const DIVariable &Var,
const MDNode *Scope);
void ensureAbstractVariableIsCreatedIfScoped(const DIVariable &Var,
const MDNode *Scope);
DbgVariable *findAbstractVariable(DIVariable &Var, const MDNode *Scope);
/// \brief Find DIE for the given subprogram and attach appropriate
/// DW_AT_low_pc and DW_AT_high_pc attributes. If there are global