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Extend the IL for selecting TLS models (PR9788)

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This allows the user/front-end to specify a model that is better
than what LLVM would choose by default. For example, a variable
might be declared as

  @x = thread_local(initialexec) global i32 42

if it will not be used in a shared library that is dlopen'ed.

If the specified model isn't supported by the target, or if LLVM can
make a better choice, a different model may be used.

llvm-svn: 159077
This commit is contained in:
Hans Wennborg
2012-06-23 11:37:03 +00:00
parent bc2affc34a
commit 8c011bd43a
24 changed files with 707 additions and 48 deletions
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lib/Bitcode/Writer/BitcodeWriter.cpp
+12 -1
View File
@@ -379,6 +379,17 @@ static unsigned getEncodedVisibility(const GlobalValue *GV) {
llvm_unreachable("Invalid visibility");
}
static unsigned getEncodedThreadLocalMode(const GlobalVariable *GV) {
switch (GV->getThreadLocalMode()) {
case GlobalVariable::NotThreadLocal: return 0;
case GlobalVariable::GeneralDynamicTLSModel: return 1;
case GlobalVariable::LocalDynamicTLSModel: return 2;
case GlobalVariable::InitialExecTLSModel: return 3;
case GlobalVariable::LocalExecTLSModel: return 4;
}
llvm_unreachable("Invalid TLS model");
}
// Emit top-level description of module, including target triple, inline asm,
// descriptors for global variables, and function prototype info.
static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
@@ -487,7 +498,7 @@ static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
GV->getVisibility() != GlobalValue::DefaultVisibility ||
GV->hasUnnamedAddr()) {
Vals.push_back(getEncodedVisibility(GV));
Vals.push_back(GV->isThreadLocal());
Vals.push_back(getEncodedThreadLocalMode(GV));
Vals.push_back(GV->hasUnnamedAddr());
} else {
AbbrevToUse = SimpleGVarAbbrev;