#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/MC/MCSymbol.h"
+#include "llvm/ADT/PointerUnion.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
class MMIAddrLabelMap {
MCContext &Context;
struct AddrLabelSymEntry {
- MCSymbol *Sym; // The symbol for the label.
+ /// Symbols - The symbols for the label. This is a pointer union that is
+ /// either one symbol (the common case) or a list of symbols.
+ PointerUnion<MCSymbol *, std::vector<MCSymbol*>*> Symbols;
+
Function *Fn; // The containing function of the BasicBlock.
unsigned Index; // The index in BBCallbacks for the BasicBlock.
};
~MMIAddrLabelMap() {
assert(DeletedAddrLabelsNeedingEmission.empty() &&
"Some labels for deleted blocks never got emitted");
+
+ // Deallocate any of the 'list of symbols' case.
+ for (DenseMap<AssertingVH<BasicBlock>, AddrLabelSymEntry>::iterator
+ I = AddrLabelSymbols.begin(), E = AddrLabelSymbols.end(); I != E; ++I)
+ if (I->second.Symbols.is<std::vector<MCSymbol*>*>())
+ delete I->second.Symbols.get<std::vector<MCSymbol*>*>();
}
- MCSymbol *getAddrLabelSymbol(BasicBlock *BB);
+ MCSymbol *getAddrLabelSymbol(BasicBlock *BB);
+ std::vector<MCSymbol*> getAddrLabelSymbolToEmit(BasicBlock *BB);
+
void takeDeletedSymbolsForFunction(Function *F,
std::vector<MCSymbol*> &Result);
AddrLabelSymEntry &Entry = AddrLabelSymbols[BB];
// If we already had an entry for this block, just return it.
- if (Entry.Sym) {
+ if (!Entry.Symbols.isNull()) {
assert(BB->getParent() == Entry.Fn && "Parent changed");
- return Entry.Sym;
+ if (Entry.Symbols.is<MCSymbol*>())
+ return Entry.Symbols.get<MCSymbol*>();
+ return (*Entry.Symbols.get<std::vector<MCSymbol*>*>())[0];
}
// Otherwise, this is a new entry, create a new symbol for it and add an
BBCallbacks.back().setMap(this);
Entry.Index = BBCallbacks.size()-1;
Entry.Fn = BB->getParent();
- return Entry.Sym = Context.CreateTempSymbol();
+ MCSymbol *Result = Context.CreateTempSymbol();
+ Entry.Symbols = Result;
+ return Result;
+}
+
+std::vector<MCSymbol*>
+MMIAddrLabelMap::getAddrLabelSymbolToEmit(BasicBlock *BB) {
+ assert(BB->hasAddressTaken() &&
+ "Shouldn't get label for block without address taken");
+ AddrLabelSymEntry &Entry = AddrLabelSymbols[BB];
+
+ std::vector<MCSymbol*> Result;
+
+ // If we already had an entry for this block, just return it.
+ if (Entry.Symbols.isNull())
+ Result.push_back(getAddrLabelSymbol(BB));
+ else if (MCSymbol *Sym = Entry.Symbols.dyn_cast<MCSymbol*>())
+ Result.push_back(Sym);
+ else
+ Result = *Entry.Symbols.get<std::vector<MCSymbol*>*>();
+ return Result;
}
+
/// takeDeletedSymbolsForFunction - If we have any deleted symbols for F, return
/// them.
void MMIAddrLabelMap::
// queue it up for later emission when the function is output.
AddrLabelSymEntry Entry = AddrLabelSymbols[BB];
AddrLabelSymbols.erase(BB);
- assert(Entry.Sym && "Didn't have a symbol, why a callback?");
+ assert(!Entry.Symbols.isNull() && "Didn't have a symbol, why a callback?");
BBCallbacks[Entry.Index] = 0; // Clear the callback.
- if (Entry.Sym->isDefined())
- return;
-
- // If the block is not yet defined, we need to emit it at the end of the
- // function. Add the symbol to the DeletedAddrLabelsNeedingEmission list for
- // the containing Function. Since the block is being deleted, its parent may
- // already be removed, we have to get the function from 'Entry'.
assert((BB->getParent() == 0 || BB->getParent() == Entry.Fn) &&
"Block/parent mismatch");
+
+ // Handle both the single and the multiple symbols cases.
+ if (MCSymbol *Sym = Entry.Symbols.dyn_cast<MCSymbol*>()) {
+ if (Sym->isDefined())
+ return;
- DeletedAddrLabelsNeedingEmission[Entry.Fn].push_back(Entry.Sym);
+ // If the block is not yet defined, we need to emit it at the end of the
+ // function. Add the symbol to the DeletedAddrLabelsNeedingEmission list
+ // for the containing Function. Since the block is being deleted, its
+ // parent may already be removed, we have to get the function from 'Entry'.
+ DeletedAddrLabelsNeedingEmission[Entry.Fn].push_back(Sym);
+ } else {
+ std::vector<MCSymbol*> *Syms = Entry.Symbols.get<std::vector<MCSymbol*>*>();
+
+ for (unsigned i = 0, e = Syms->size(); i != e; ++i) {
+ MCSymbol *Sym = (*Syms)[i];
+ if (Sym->isDefined()) continue; // Ignore already emitted labels.
+
+ // If the block is not yet defined, we need to emit it at the end of the
+ // function. Add the symbol to the DeletedAddrLabelsNeedingEmission list
+ // for the containing Function. Since the block is being deleted, its
+ // parent may already be removed, we have to get the function from
+ // 'Entry'.
+ DeletedAddrLabelsNeedingEmission[Entry.Fn].push_back(Sym);
+ }
+
+ // The entry is deleted, free the memory associated with the symbol list.
+ delete Syms;
+ }
}
void MMIAddrLabelMap::UpdateForRAUWBlock(BasicBlock *Old, BasicBlock *New) {
// Get the entry for the RAUW'd block and remove it from our map.
AddrLabelSymEntry OldEntry = AddrLabelSymbols[Old];
AddrLabelSymbols.erase(Old);
- assert(OldEntry.Sym && "Didn't have a symbol, why a callback?");
-
+ assert(!OldEntry.Symbols.isNull() && "Didn't have a symbol, why a callback?");
+
+ AddrLabelSymEntry &NewEntry = AddrLabelSymbols[New];
+
// If New is not address taken, just move our symbol over to it.
- if (!AddrLabelSymbols.count(New)) {
+ if (NewEntry.Symbols.isNull()) {
BBCallbacks[OldEntry.Index] = New; // Update the callback.
- AddrLabelSymbols[New] = OldEntry; // Set New's entry.
- } else {
- assert(0 && "Case not handled yet!");
- abort();
+ NewEntry = OldEntry; // Set New's entry.
+ return;
}
+
+ BBCallbacks[OldEntry.Index] = 0; // Update the callback.
+
+ // Otherwise, we need to add the old symbol to the new block's set. If it is
+ // just a single entry, upgrade it to a symbol list.
+ if (MCSymbol *PrevSym = NewEntry.Symbols.dyn_cast<MCSymbol*>()) {
+ std::vector<MCSymbol*> *SymList = new std::vector<MCSymbol*>();
+ SymList->push_back(PrevSym);
+ NewEntry.Symbols = SymList;
+ }
+
+ std::vector<MCSymbol*> *SymList =
+ NewEntry.Symbols.get<std::vector<MCSymbol*>*>();
+
+ // If the old entry was a single symbol, add it.
+ if (MCSymbol *Sym = OldEntry.Symbols.dyn_cast<MCSymbol*>()) {
+ SymList->push_back(Sym);
+ return;
+ }
+
+ // Otherwise, concatenate the list.
+ std::vector<MCSymbol*> *Syms =OldEntry.Symbols.get<std::vector<MCSymbol*>*>();
+ SymList->insert(SymList->end(), Syms->begin(), Syms->end());
+ delete Syms;
}
return AddrLabelSymbols->getAddrLabelSymbol(const_cast<BasicBlock*>(BB));
}
+/// getAddrLabelSymbolToEmit - Return the symbol to be used for the specified
+/// basic block when its address is taken. If other blocks were RAUW'd to
+/// this one, we may have to emit them as well, return the whole set.
+std::vector<MCSymbol*> MachineModuleInfo::
+getAddrLabelSymbolToEmit(const BasicBlock *BB) {
+ // Lazily create AddrLabelSymbols.
+ if (AddrLabelSymbols == 0)
+ AddrLabelSymbols = new MMIAddrLabelMap(Context);
+ return AddrLabelSymbols->getAddrLabelSymbolToEmit(const_cast<BasicBlock*>(BB));
+}
+
+
/// takeDeletedSymbolsForFunction - If the specified function has had any
/// references to address-taken blocks generated, but the block got deleted,
/// return the symbol now so we can emit it. This prevents emitting a
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