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2f21b887d3
Original Patch and summary by Philip Reames. RewriteStatepointsForGC tries to rewrite a function in a manner where the optimizer can't end up using a pointer value after it might have been relocated by a safepoint. This pass checks the invariant that RSForGC is supposed to establish and that (if we constructed semantics correctly) later passes must preserve. This has been a really useful diagnostic tool when initially developing the rewriting scheme and has found numerous bugs. Differential Revision: https://reviews.llvm.org/D15940 Reviewed by: swaroop.sridhar, mjacob Subscribers: llvm-commits llvm-svn: 307112
36 lines
1.3 KiB
C++
36 lines
1.3 KiB
C++
//===- SafepointIRVerifier.h - Checks for GC relocation problems *- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines a verifier which is useful for enforcing the relocation
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// properties required by a relocating GC. Specifically, it looks for uses of
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// the unrelocated value of pointer SSA values after a possible safepoint. It
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// attempts to report no false negatives, but may end up reporting false
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// positives in rare cases (see the note at the top of the corresponding cpp
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// file.)
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_SAFEPOINT_IR_VERIFIER
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#define LLVM_IR_SAFEPOINT_IR_VERIFIER
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namespace llvm {
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class Function;
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class FunctionPass;
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/// Run the safepoint verifier over a single function. Crashes on failure.
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void verifySafepointIR(Function &F);
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/// Create an instance of the safepoint verifier pass which can be added to
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/// a pass pipeline to check for relocation bugs.
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FunctionPass *createSafepointIRVerifierPass();
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}
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#endif // LLVM_IR_SAFEPOINT_IR_VERIFIER
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