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84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
//===- StripMetaData - Strips D-specific metadata -------------------------===//
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//
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// The LLVM D Compiler
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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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// There's an issue with the new LLVM metadata support; an assertion fires when
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// trying to generate asm for metadata globals.
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//
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// This pass is a workaround; it deletes the metadata LDC generates so the code
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// generator doesn't see it.
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// Obviously, this should only run after all passes that make use of that
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// metadata or they won't work.
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//
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//===----------------------------------------------------------------------===//
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#include "gen/metadata.h"
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// This pass isn't needed without metadata, so #ifdef it out entirely if the
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// LLVM version in use doesn't support it.
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#ifdef USE_METADATA
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#define DEBUG_TYPE "strip-metadata"
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#include "Passes.h"
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#include "llvm/Pass.h"
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#include "llvm/Module.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Debug.h"
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using namespace llvm;
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STATISTIC(NumDeleted, "Number of metadata globals deleted");
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//===----------------------------------------------------------------------===//
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// StripMetaData Pass Implementation
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//===----------------------------------------------------------------------===//
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namespace {
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/// This pass optimizes library functions from the D runtime as used by LDC.
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///
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class VISIBILITY_HIDDEN StripMetaData : public ModulePass {
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public:
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static char ID; // Pass identification
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StripMetaData() : ModulePass(&ID) {}
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bool runOnModule(Module &M);
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};
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char StripMetaData::ID = 0;
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} // end anonymous namespace.
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static RegisterPass<StripMetaData>
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X("strip-metadata", "Delete D-specific metadata");
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// Public interface to the pass.
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ModulePass *createStripMetaData() {
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return new StripMetaData();
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}
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/// runOnFunction - Top level algorithm.
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///
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bool StripMetaData::runOnModule(Module &M) {
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bool Changed = false;
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for (Module::global_iterator I = M.global_begin(), E = M.global_end(); I != E;) {
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GlobalVariable* G = I++;
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if (G->getNameLen() >= 9 && !strncmp(G->getNameStart(), "llvm.ldc.", 9)) {
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assert(G->hasInitializer() && isa<MDNode>(G->getInitializer())
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&& "Not a metadata global?");
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Changed = true;
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NumDeleted++;
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DEBUG(DOUT << "Deleting " << *G << '\n');
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G->eraseFromParent();
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}
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}
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return Changed;
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}
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#endif //USE_METADATA
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