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Use printable names to implement directional labels.

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This changes the implementation of local directional labels to use a dedicated
map. With that it can then just use CreateTempSymbol, which is what the rest
of MC uses.

CreateTempSymbol doesn't do a great job at making sure the names are unique
(or being efficient when the names are not needed), but that should probably
be fixed in a followup patch.

This fixes pr18928.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203826 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2014-03-13 18:09:26 +00:00
parent 1fa9a14308
commit 7e9df19d5f
5 changed files with 44 additions and 26 deletions
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27
include/llvm/MC/MCContext.h
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@@ -70,6 +70,14 @@ namespace llvm {
/// Symbols - Bindings of names to symbols.
SymbolTable Symbols;
/// A maping from a local label number and an instance count to a symbol.
/// For example, in the assembly
/// 1:
/// 2:
/// 1:
/// We have three labels represented by the pairs (1, 0), (2, 0) and (1, 1)
DenseMap<std::pair<unsigned, unsigned>, MCSymbol*> LocalSymbols;
/// UsedNames - Keeps tracks of names that were used both for used declared
/// and artificial symbols.
StringMap<bool, BumpPtrAllocator&> UsedNames;
@@ -82,10 +90,10 @@ namespace llvm {
DenseMap<unsigned, MCLabel *> Instances;
/// NextInstance() creates the next instance of the directional local label
/// for the LocalLabelVal and adds it to the map if needed.
unsigned NextInstance(int64_t LocalLabelVal);
unsigned NextInstance(unsigned LocalLabelVal);
/// GetInstance() gets the current instance of the directional local label
/// for the LocalLabelVal and adds it to the map if needed.
unsigned GetInstance(int64_t LocalLabelVal);
unsigned GetInstance(unsigned LocalLabelVal);
/// The file name of the log file from the environment variable
/// AS_SECURE_LOG_FILE. Which must be set before the .secure_log_unique
@@ -154,6 +162,9 @@ namespace llvm {
MCSymbol *CreateSymbol(StringRef Name);
MCSymbol *getOrCreateDirectionalLocalSymbol(unsigned LocalLabelVal,
unsigned Instance);
public:
explicit MCContext(const MCAsmInfo *MAI, const MCRegisterInfo *MRI,
const MCObjectFileInfo *MOFI, const SourceMgr *Mgr = 0,
@@ -190,13 +201,13 @@ namespace llvm {
/// symbol names.
unsigned getUniqueSymbolID() { return NextUniqueID++; }
/// CreateDirectionalLocalSymbol - Create the definition of a directional
/// local symbol for numbered label (used for "1:" definitions).
MCSymbol *CreateDirectionalLocalSymbol(int64_t LocalLabelVal);
/// Create the definition of a directional local symbol for numbered label
/// (used for "1:" definitions).
MCSymbol *CreateDirectionalLocalSymbol(unsigned LocalLabelVal);
/// GetDirectionalLocalSymbol - Create and return a directional local
/// symbol for numbered label (used for "1b" or 1f" references).
MCSymbol *GetDirectionalLocalSymbol(int64_t LocalLabelVal, int bORf);
/// Create and return a directional local symbol for numbered label (used
/// for "1b" or 1f" references).
MCSymbol *GetDirectionalLocalSymbol(unsigned LocalLabelVal, bool Before);
/// GetOrCreateSymbol - Lookup the symbol inside with the specified
/// @p Name. If it exists, return it. If not, create a forward