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//===-- PNaClABISimplify.cpp - Lists PNaCl ABI simplification passes ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the meta-passes "-pnacl-abi-simplify-preopt"
// and "-pnacl-abi-simplify-postopt". It lists their constituent
// passes.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/NaCl.h"
#include "llvm/PassManager.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/NaCl.h"
#include "llvm/Transforms/Scalar.h"
using namespace llvm;
void llvm::PNaClABISimplifyAddPreOptPasses(PassManager &PM) {
// Internalize all symbols in the module except _start, which is the only
// symbol a stable PNaCl pexe is allowed to export.
const char *SymbolsToPreserve[] = { "_start" };
PM.add(createInternalizePass(SymbolsToPreserve));
// LowerExpect converts Intrinsic::expect into branch weights,
// which can then be removed after BlockPlacement.
PM.add(createLowerExpectIntrinsicPass());
// Rewrite unsupported intrinsics to simpler and portable constructs.
PM.add(createRewriteLLVMIntrinsicsPass());
// LowerInvoke prevents use of C++ exception handling, which is not
// yet supported in the PNaCl ABI.
PM.add(createLowerInvokePass());
// Remove landingpad blocks made unreachable by LowerInvoke.
PM.add(createCFGSimplificationPass());
// Expand out some uses of struct types.
PM.add(createExpandArithWithOverflowPass());
// ExpandStructRegs must be run after ExpandArithWithOverflow to
// expand out the insertvalue instructions that
// ExpandArithWithOverflow introduces.
PM.add(createExpandStructRegsPass());
PM.add(createExpandVarArgsPass());
PM.add(createExpandCtorsPass());
PM.add(createResolveAliasesPass());
PM.add(createExpandTlsPass());
// GlobalCleanup needs to run after ExpandTls because
// __tls_template_start etc. are extern_weak before expansion
PM.add(createGlobalCleanupPass());
}
void llvm::PNaClABISimplifyAddPostOptPasses(PassManager &PM) {
PM.add(createRewritePNaClLibraryCallsPass());
// We place ExpandByVal after optimization passes because some byval
// arguments can be expanded away by the ArgPromotion pass. Leaving
// in "byval" during optimization also allows some dead stores to be
// eliminated, because "byval" is a stronger constraint than what
// ExpandByVal expands it to.
PM.add(createExpandByValPass());
// We place ExpandSmallArguments after optimization passes because
// some optimizations undo its changes. Note that
// ExpandSmallArguments requires that ExpandVarArgs has already been
// run.
PM.add(createExpandSmallArgumentsPass());
PM.add(createPromoteI1OpsPass());
// Optimization passes and ExpandByVal introduce
// memset/memcpy/memmove intrinsics with a 64-bit size argument.
// This pass converts those arguments to 32-bit.
PM.add(createCanonicalizeMemIntrinsicsPass());
// We place StripMetadata after optimization passes because
// optimizations depend on the metadata.
PM.add(createStripMetadataPass());
// FlattenGlobals introduces ConstantExpr bitcasts of globals which
// are expanded out later.
PM.add(createFlattenGlobalsPass());
// We should not place arbitrary passes after ExpandConstantExpr
// because they might reintroduce ConstantExprs.
PM.add(createExpandConstantExprPass());
// PromoteIntegersPass does not handle constexprs and creates GEPs,
// so it goes between those passes.
PM.add(createPromoteIntegersPass());
// ExpandGetElementPtr must follow ExpandConstantExpr to expand the
// getelementptr instructions it creates.
PM.add(createExpandGetElementPtrPass());
// Rewrite atomic and volatile instructions with intrinsic calls.
PM.add(createRewriteAtomicsPass());
// Remove ``asm("":::"memory")``. This must occur after rewriting
// atomics: a ``fence seq_cst`` surrounded by ``asm("":::"memory")``
// has special meaning and is translated differently.
PM.add(createRemoveAsmMemoryPass());
// ReplacePtrsWithInts assumes that getelementptr instructions and
// ConstantExprs have already been expanded out.
PM.add(createReplacePtrsWithIntsPass());
// We place StripAttributes after optimization passes because many
// analyses add attributes to reflect their results.
// StripAttributes must come after ExpandByVal and
// ExpandSmallArguments.
PM.add(createStripAttributesPass());
// Strip dead prototytes to appease the intrinsic ABI checks.
// ExpandVarArgs leaves around vararg intrinsics, and
// ReplacePtrsWithInts leaves the lifetime.start/end intrinsics.
PM.add(createStripDeadPrototypesPass());
// Eliminate simple dead code that the post-opt passes could have
// create. These are fairly simple passes that won't break the ABI.
PM.add(createDeadInstEliminationPass());
PM.add(createDeadCodeEliminationPass());
}
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