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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) {
// 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());
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());
// 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());
// 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());
}
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