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Change the JIT to compile eagerly by default as agreed in

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http://llvm.org/PR5184, and beef up the comments to describe what both options
do and the risks of lazy compilation in the presence of threads.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85295 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jeffrey Yasskin
2009-10-27 20:30:28 +00:00
parent 5f75cf511b
commit dc85724f70
8 changed files with 59 additions and 59 deletions
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25
include/llvm/ExecutionEngine/ExecutionEngine.h
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@ -88,7 +88,7 @@ public:
class ExecutionEngine {
const TargetData *TD;
ExecutionEngineState EEState;
bool LazyCompilationDisabled;
bool CompilingLazily;
bool GVCompilationDisabled;
bool SymbolSearchingDisabled;
bool DlsymStubsEnabled;
@ -319,13 +319,24 @@ public:
virtual void RegisterJITEventListener(JITEventListener *) {}
virtual void UnregisterJITEventListener(JITEventListener *) {}
/// DisableLazyCompilation - If called, the JIT will abort if lazy compilation
/// is ever attempted.
void DisableLazyCompilation(bool Disabled = true) {
LazyCompilationDisabled = Disabled;
/// EnableLazyCompilation - When lazy compilation is off (the default), the
/// JIT will eagerly compile every function reachable from the argument to
/// getPointerToFunction. If lazy compilation is turned on, the JIT will only
/// compile the one function and emit stubs to compile the rest when they're
/// first called. If lazy compilation is turned off again while some lazy
/// stubs are still around, and one of those stubs is called, the program will
/// abort.
///
/// In order to safely compile lazily in a threaded program, the user must
/// ensure that 1) only one thread at a time can call any particular lazy
/// stub, and 2) any thread modifying LLVM IR must hold the JIT's lock
/// (ExecutionEngine::lock) or otherwise ensure that no other thread calls a
/// lazy stub. See http://llvm.org/PR5184 for details.
void EnableLazyCompilation(bool Enabled = true) {
CompilingLazily = Enabled;
}
bool isLazyCompilationDisabled() const {
return LazyCompilationDisabled;
bool isCompilingLazily() const {
return CompilingLazily;
}
/// DisableGVCompilation - If called, the JIT will abort if it's asked to