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Adding a collector name attribute to Function in the IR. These

Browse Source 
methods are new to Function:

  bool hasCollector() const;
  const std::string &getCollector() const;
  void setCollector(const std::string &);
  void clearCollector();

The assembly representation is as such:

  define void @f() gc "shadow-stack" { ...

The implementation uses an on-the-side table to map Functions to 
collector names, such that there is no overhead. A StringPool is 
further used to unique collector names, which are extremely
likely to be unique per process.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44769 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Gordon Henriksen
2007-12-10 03:18:06 +00:00
parent afba8fe662
commit 80a75bfae9
21 changed files with 1468 additions and 1250 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
lib/Bitcode/Writer/BitcodeWriter.cpp
View File

@ -297,9 +297,10 @@ static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(),
0/*TODO*/, Stream);
// Emit information about sections, computing how many there are. Also
// compute the maximum alignment value.
// Emit information about sections and collectors, computing how many there
// are. Also compute the maximum alignment value.
std::map<std::string, unsigned> SectionMap;
std::map<std::string, unsigned> CollectorMap;
unsigned MaxAlignment = 0;
unsigned MaxGlobalType = 0;
for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
@ -317,13 +318,24 @@ static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
}
for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
MaxAlignment = std::max(MaxAlignment, F->getAlignment());
if (!F->hasSection()) continue;
// Give section names unique ID's.
unsigned &Entry = SectionMap[F->getSection()];
if (Entry != 0) continue;
WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(),
0/*TODO*/, Stream);
Entry = SectionMap.size();
if (F->hasSection()) {
// Give section names unique ID's.
unsigned &Entry = SectionMap[F->getSection()];
if (!Entry) {
WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(),
0/*TODO*/, Stream);
Entry = SectionMap.size();
}
}
if (F->hasCollector()) {
// Same for collector names.
unsigned &Entry = CollectorMap[F->getCollector()];
if (!Entry) {
WriteStringRecord(bitc::MODULE_CODE_COLLECTORNAME, F->getCollector(),
0/*TODO*/, Stream);
Entry = CollectorMap.size();
}
}
}
// Emit abbrev for globals, now that we know # sections and max alignment.
@ -383,7 +395,7 @@ static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
// Emit the function proto information.
for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
// FUNCTION: [type, callingconv, isproto, paramattr,
// linkage, alignment, section, visibility]
// linkage, alignment, section, visibility, collector]
Vals.push_back(VE.getTypeID(F->getType()));
Vals.push_back(F->getCallingConv());
Vals.push_back(F->isDeclaration());
@ -392,6 +404,7 @@ static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
Vals.push_back(Log2_32(F->getAlignment())+1);
Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0);
Vals.push_back(getEncodedVisibility(F));
Vals.push_back(F->hasCollector() ? CollectorMap[F->getCollector()] : 0);
unsigned AbbrevToUse = 0;
Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);