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EH: Prune unreachable resume instructions during Dwarf EH preparation

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Today a simple function that only catches exceptions and doesn't run
destructor cleanups ends up containing a dead call to _Unwind_Resume
(PR20300). We can't remove these dead resume instructions during normal
optimization because inlining might introduce additional landingpads
that do have cleanups to run. Instead we can do this during EH
preparation, which is guaranteed to run after inlining.

Fixes PR20300.

Reviewers: majnemer

Differential Revision: http://reviews.llvm.org/D7744

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229944 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner
2015-02-20 01:00:19 +00:00
parent 8c4bb575e1
commit 49ab3a626a
9 changed files with 245 additions and 35 deletions
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23
include/llvm/CodeGen/Passes.h
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@@ -612,13 +612,13 @@ namespace llvm {
ModulePass *createForwardControlFlowIntegrityPass();
} // End llvm namespace
/// This initializer registers TargetMachine constructor, so the pass being
/// initialized can use target dependent interfaces. Please do not move this
/// macro to be together with INITIALIZE_PASS, which is a complete target
/// independent initializer, and we don't want to make libScalarOpts depend
/// on libCodeGen.
#define INITIALIZE_TM_PASS(passName, arg, name, cfg, analysis) \
static void* initialize##passName##PassOnce(PassRegistry &Registry) { \
/// Target machine pass initializer for passes with dependencies. Use with
/// INITIALIZE_TM_PASS_END.
#define INITIALIZE_TM_PASS_BEGIN INITIALIZE_PASS_BEGIN
/// Target machine pass initializer for passes with dependencies. Use with
/// INITIALIZE_TM_PASS_BEGIN.
#define INITIALIZE_TM_PASS_END(passName, arg, name, cfg, analysis) \
PassInfo *PI = new PassInfo(name, arg, & passName ::ID, \
PassInfo::NormalCtor_t(callDefaultCtor< passName >), cfg, analysis, \
PassInfo::TargetMachineCtor_t(callTargetMachineCtor< passName >)); \
@@ -629,4 +629,13 @@ namespace llvm {
CALL_ONCE_INITIALIZATION(initialize##passName##PassOnce) \
}
/// This initializer registers TargetMachine constructor, so the pass being
/// initialized can use target dependent interfaces. Please do not move this
/// macro to be together with INITIALIZE_PASS, which is a complete target
/// independent initializer, and we don't want to make libScalarOpts depend
/// on libCodeGen.
#define INITIALIZE_TM_PASS(passName, arg, name, cfg, analysis) \
INITIALIZE_TM_PASS_BEGIN(passName, arg, name, cfg, analysis) \
INITIALIZE_TM_PASS_END(passName, arg, name, cfg, analysis)
#endif