mirror of
https://github.com/RPCS3/llvm-mirror.git
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9b6f209c8c
llvm-svn: 187899
1188 lines
40 KiB
C++
1188 lines
40 KiB
C++
//===- lib/MC/MCAssembler.cpp - Assembler Backend Implementation ----------===//
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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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#define DEBUG_TYPE "assembler"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCAsmLayout.h"
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#include "llvm/MC/MCCodeEmitter.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCDwarf.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCFixupKindInfo.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/LEB128.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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namespace {
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namespace stats {
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STATISTIC(EmittedFragments, "Number of emitted assembler fragments - total");
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STATISTIC(EmittedRelaxableFragments,
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"Number of emitted assembler fragments - relaxable");
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STATISTIC(EmittedDataFragments,
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"Number of emitted assembler fragments - data");
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STATISTIC(EmittedCompactEncodedInstFragments,
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"Number of emitted assembler fragments - compact encoded inst");
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STATISTIC(EmittedAlignFragments,
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"Number of emitted assembler fragments - align");
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STATISTIC(EmittedFillFragments,
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"Number of emitted assembler fragments - fill");
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STATISTIC(EmittedOrgFragments,
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"Number of emitted assembler fragments - org");
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STATISTIC(evaluateFixup, "Number of evaluated fixups");
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STATISTIC(FragmentLayouts, "Number of fragment layouts");
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STATISTIC(ObjectBytes, "Number of emitted object file bytes");
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STATISTIC(RelaxationSteps, "Number of assembler layout and relaxation steps");
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STATISTIC(RelaxedInstructions, "Number of relaxed instructions");
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}
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}
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// FIXME FIXME FIXME: There are number of places in this file where we convert
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// what is a 64-bit assembler value used for computation into a value in the
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// object file, which may truncate it. We should detect that truncation where
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// invalid and report errors back.
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/* *** */
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MCAsmLayout::MCAsmLayout(MCAssembler &Asm)
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: Assembler(Asm), LastValidFragment()
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{
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// Compute the section layout order. Virtual sections must go last.
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for (MCAssembler::iterator it = Asm.begin(), ie = Asm.end(); it != ie; ++it)
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if (!it->getSection().isVirtualSection())
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SectionOrder.push_back(&*it);
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for (MCAssembler::iterator it = Asm.begin(), ie = Asm.end(); it != ie; ++it)
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if (it->getSection().isVirtualSection())
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SectionOrder.push_back(&*it);
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}
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bool MCAsmLayout::isFragmentValid(const MCFragment *F) const {
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const MCSectionData &SD = *F->getParent();
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const MCFragment *LastValid = LastValidFragment.lookup(&SD);
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if (!LastValid)
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return false;
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assert(LastValid->getParent() == F->getParent());
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return F->getLayoutOrder() <= LastValid->getLayoutOrder();
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}
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void MCAsmLayout::invalidateFragmentsFrom(MCFragment *F) {
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// If this fragment wasn't already valid, we don't need to do anything.
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if (!isFragmentValid(F))
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return;
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// Otherwise, reset the last valid fragment to the previous fragment
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// (if this is the first fragment, it will be NULL).
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const MCSectionData &SD = *F->getParent();
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LastValidFragment[&SD] = F->getPrevNode();
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}
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void MCAsmLayout::ensureValid(const MCFragment *F) const {
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MCSectionData &SD = *F->getParent();
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MCFragment *Cur = LastValidFragment[&SD];
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if (!Cur)
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Cur = &*SD.begin();
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else
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Cur = Cur->getNextNode();
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// Advance the layout position until the fragment is valid.
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while (!isFragmentValid(F)) {
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assert(Cur && "Layout bookkeeping error");
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const_cast<MCAsmLayout*>(this)->layoutFragment(Cur);
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Cur = Cur->getNextNode();
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}
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}
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uint64_t MCAsmLayout::getFragmentOffset(const MCFragment *F) const {
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ensureValid(F);
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assert(F->Offset != ~UINT64_C(0) && "Address not set!");
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return F->Offset;
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}
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uint64_t MCAsmLayout::getSymbolOffset(const MCSymbolData *SD) const {
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const MCSymbol &S = SD->getSymbol();
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// If this is a variable, then recursively evaluate now.
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if (S.isVariable()) {
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MCValue Target;
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if (!S.getVariableValue()->EvaluateAsRelocatable(Target, *this))
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report_fatal_error("unable to evaluate offset for variable '" +
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S.getName() + "'");
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// Verify that any used symbols are defined.
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if (Target.getSymA() && Target.getSymA()->getSymbol().isUndefined())
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report_fatal_error("unable to evaluate offset to undefined symbol '" +
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Target.getSymA()->getSymbol().getName() + "'");
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if (Target.getSymB() && Target.getSymB()->getSymbol().isUndefined())
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report_fatal_error("unable to evaluate offset to undefined symbol '" +
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Target.getSymB()->getSymbol().getName() + "'");
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uint64_t Offset = Target.getConstant();
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if (Target.getSymA())
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Offset += getSymbolOffset(&Assembler.getSymbolData(
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Target.getSymA()->getSymbol()));
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if (Target.getSymB())
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Offset -= getSymbolOffset(&Assembler.getSymbolData(
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Target.getSymB()->getSymbol()));
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return Offset;
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}
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assert(SD->getFragment() && "Invalid getOffset() on undefined symbol!");
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return getFragmentOffset(SD->getFragment()) + SD->getOffset();
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}
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uint64_t MCAsmLayout::getSectionAddressSize(const MCSectionData *SD) const {
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// The size is the last fragment's end offset.
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const MCFragment &F = SD->getFragmentList().back();
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return getFragmentOffset(&F) + getAssembler().computeFragmentSize(*this, F);
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}
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uint64_t MCAsmLayout::getSectionFileSize(const MCSectionData *SD) const {
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// Virtual sections have no file size.
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if (SD->getSection().isVirtualSection())
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return 0;
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// Otherwise, the file size is the same as the address space size.
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return getSectionAddressSize(SD);
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}
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uint64_t MCAsmLayout::computeBundlePadding(const MCFragment *F,
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uint64_t FOffset, uint64_t FSize) {
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uint64_t BundleSize = Assembler.getBundleAlignSize();
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assert(BundleSize > 0 &&
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"computeBundlePadding should only be called if bundling is enabled");
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uint64_t BundleMask = BundleSize - 1;
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uint64_t OffsetInBundle = FOffset & BundleMask;
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uint64_t EndOfFragment = OffsetInBundle + FSize;
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// There are two kinds of bundling restrictions:
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//
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// 1) For alignToBundleEnd(), add padding to ensure that the fragment will
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// *end* on a bundle boundary.
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// 2) Otherwise, check if the fragment would cross a bundle boundary. If it
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// would, add padding until the end of the bundle so that the fragment
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// will start in a new one.
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if (F->alignToBundleEnd()) {
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// Three possibilities here:
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//
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// A) The fragment just happens to end at a bundle boundary, so we're good.
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// B) The fragment ends before the current bundle boundary: pad it just
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// enough to reach the boundary.
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// C) The fragment ends after the current bundle boundary: pad it until it
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// reaches the end of the next bundle boundary.
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//
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// Note: this code could be made shorter with some modulo trickery, but it's
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// intentionally kept in its more explicit form for simplicity.
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if (EndOfFragment == BundleSize)
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return 0;
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else if (EndOfFragment < BundleSize)
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return BundleSize - EndOfFragment;
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else { // EndOfFragment > BundleSize
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return 2 * BundleSize - EndOfFragment;
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}
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} else if (EndOfFragment > BundleSize)
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return BundleSize - OffsetInBundle;
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else
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return 0;
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}
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/* *** */
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MCFragment::MCFragment() : Kind(FragmentType(~0)) {
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}
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MCFragment::~MCFragment() {
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}
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MCFragment::MCFragment(FragmentType _Kind, MCSectionData *_Parent)
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: Kind(_Kind), Parent(_Parent), Atom(0), Offset(~UINT64_C(0))
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{
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if (Parent)
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Parent->getFragmentList().push_back(this);
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}
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/* *** */
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MCEncodedFragment::~MCEncodedFragment() {
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}
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/* *** */
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MCEncodedFragmentWithFixups::~MCEncodedFragmentWithFixups() {
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}
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/* *** */
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MCSectionData::MCSectionData() : Section(0) {}
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MCSectionData::MCSectionData(const MCSection &_Section, MCAssembler *A)
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: Section(&_Section),
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Ordinal(~UINT32_C(0)),
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Alignment(1),
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BundleLockState(NotBundleLocked), BundleGroupBeforeFirstInst(false),
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HasInstructions(false)
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{
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if (A)
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A->getSectionList().push_back(this);
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}
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MCSectionData::iterator
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MCSectionData::getSubsectionInsertionPoint(unsigned Subsection) {
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if (Subsection == 0 && SubsectionFragmentMap.empty())
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return end();
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SmallVectorImpl<std::pair<unsigned, MCFragment *> >::iterator MI =
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std::lower_bound(SubsectionFragmentMap.begin(), SubsectionFragmentMap.end(),
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std::make_pair(Subsection, (MCFragment *)0));
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bool ExactMatch = false;
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if (MI != SubsectionFragmentMap.end()) {
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ExactMatch = MI->first == Subsection;
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if (ExactMatch)
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++MI;
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}
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iterator IP;
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if (MI == SubsectionFragmentMap.end())
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IP = end();
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else
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IP = MI->second;
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if (!ExactMatch && Subsection != 0) {
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// The GNU as documentation claims that subsections have an alignment of 4,
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// although this appears not to be the case.
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MCFragment *F = new MCDataFragment();
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SubsectionFragmentMap.insert(MI, std::make_pair(Subsection, F));
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getFragmentList().insert(IP, F);
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F->setParent(this);
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}
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return IP;
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}
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/* *** */
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MCSymbolData::MCSymbolData() : Symbol(0) {}
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MCSymbolData::MCSymbolData(const MCSymbol &_Symbol, MCFragment *_Fragment,
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uint64_t _Offset, MCAssembler *A)
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: Symbol(&_Symbol), Fragment(_Fragment), Offset(_Offset),
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IsExternal(false), IsPrivateExtern(false),
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CommonSize(0), SymbolSize(0), CommonAlign(0),
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Flags(0), Index(0)
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{
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if (A)
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A->getSymbolList().push_back(this);
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}
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/* *** */
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MCAssembler::MCAssembler(MCContext &Context_, MCAsmBackend &Backend_,
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MCCodeEmitter &Emitter_, MCObjectWriter &Writer_,
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raw_ostream &OS_)
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: Context(Context_), Backend(Backend_), Emitter(Emitter_), Writer(Writer_),
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OS(OS_), BundleAlignSize(0), RelaxAll(false), NoExecStack(false),
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SubsectionsViaSymbols(false), ELFHeaderEFlags(0) {
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}
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MCAssembler::~MCAssembler() {
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}
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void MCAssembler::reset() {
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Sections.clear();
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Symbols.clear();
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SectionMap.clear();
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SymbolMap.clear();
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IndirectSymbols.clear();
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DataRegions.clear();
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ThumbFuncs.clear();
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RelaxAll = false;
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NoExecStack = false;
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SubsectionsViaSymbols = false;
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ELFHeaderEFlags = 0;
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// reset objects owned by us
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getBackend().reset();
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getEmitter().reset();
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getWriter().reset();
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}
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bool MCAssembler::isSymbolLinkerVisible(const MCSymbol &Symbol) const {
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// Non-temporary labels should always be visible to the linker.
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if (!Symbol.isTemporary())
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return true;
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// Absolute temporary labels are never visible.
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if (!Symbol.isInSection())
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return false;
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// Otherwise, check if the section requires symbols even for temporary labels.
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return getBackend().doesSectionRequireSymbols(Symbol.getSection());
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}
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const MCSymbolData *MCAssembler::getAtom(const MCSymbolData *SD) const {
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// Linker visible symbols define atoms.
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if (isSymbolLinkerVisible(SD->getSymbol()))
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return SD;
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// Absolute and undefined symbols have no defining atom.
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if (!SD->getFragment())
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return 0;
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// Non-linker visible symbols in sections which can't be atomized have no
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// defining atom.
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if (!getBackend().isSectionAtomizable(
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SD->getFragment()->getParent()->getSection()))
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return 0;
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// Otherwise, return the atom for the containing fragment.
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return SD->getFragment()->getAtom();
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}
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bool MCAssembler::evaluateFixup(const MCAsmLayout &Layout,
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const MCFixup &Fixup, const MCFragment *DF,
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MCValue &Target, uint64_t &Value) const {
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++stats::evaluateFixup;
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if (!Fixup.getValue()->EvaluateAsRelocatable(Target, Layout))
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getContext().FatalError(Fixup.getLoc(), "expected relocatable expression");
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bool IsPCRel = Backend.getFixupKindInfo(
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Fixup.getKind()).Flags & MCFixupKindInfo::FKF_IsPCRel;
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bool IsResolved;
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if (IsPCRel) {
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if (Target.getSymB()) {
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IsResolved = false;
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} else if (!Target.getSymA()) {
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IsResolved = false;
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} else {
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const MCSymbolRefExpr *A = Target.getSymA();
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const MCSymbol &SA = A->getSymbol();
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if (A->getKind() != MCSymbolRefExpr::VK_None ||
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SA.AliasedSymbol().isUndefined()) {
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IsResolved = false;
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} else {
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const MCSymbolData &DataA = getSymbolData(SA);
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IsResolved =
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getWriter().IsSymbolRefDifferenceFullyResolvedImpl(*this, DataA,
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*DF, false, true);
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}
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}
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} else {
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IsResolved = Target.isAbsolute();
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}
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Value = Target.getConstant();
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if (const MCSymbolRefExpr *A = Target.getSymA()) {
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const MCSymbol &Sym = A->getSymbol().AliasedSymbol();
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if (Sym.isDefined())
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Value += Layout.getSymbolOffset(&getSymbolData(Sym));
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}
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if (const MCSymbolRefExpr *B = Target.getSymB()) {
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const MCSymbol &Sym = B->getSymbol().AliasedSymbol();
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if (Sym.isDefined())
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Value -= Layout.getSymbolOffset(&getSymbolData(Sym));
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}
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bool ShouldAlignPC = Backend.getFixupKindInfo(Fixup.getKind()).Flags &
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MCFixupKindInfo::FKF_IsAlignedDownTo32Bits;
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assert((ShouldAlignPC ? IsPCRel : true) &&
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"FKF_IsAlignedDownTo32Bits is only allowed on PC-relative fixups!");
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if (IsPCRel) {
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uint32_t Offset = Layout.getFragmentOffset(DF) + Fixup.getOffset();
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// A number of ARM fixups in Thumb mode require that the effective PC
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// address be determined as the 32-bit aligned version of the actual offset.
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if (ShouldAlignPC) Offset &= ~0x3;
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Value -= Offset;
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}
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// Let the backend adjust the fixup value if necessary, including whether
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// we need a relocation.
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Backend.processFixupValue(*this, Layout, Fixup, DF, Target, Value,
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IsResolved);
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return IsResolved;
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}
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uint64_t MCAssembler::computeFragmentSize(const MCAsmLayout &Layout,
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const MCFragment &F) const {
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switch (F.getKind()) {
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case MCFragment::FT_Data:
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case MCFragment::FT_Relaxable:
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case MCFragment::FT_CompactEncodedInst:
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return cast<MCEncodedFragment>(F).getContents().size();
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case MCFragment::FT_Fill:
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return cast<MCFillFragment>(F).getSize();
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case MCFragment::FT_LEB:
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return cast<MCLEBFragment>(F).getContents().size();
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case MCFragment::FT_Align: {
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const MCAlignFragment &AF = cast<MCAlignFragment>(F);
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unsigned Offset = Layout.getFragmentOffset(&AF);
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unsigned Size = OffsetToAlignment(Offset, AF.getAlignment());
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// If we are padding with nops, force the padding to be larger than the
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// minimum nop size.
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if (Size > 0 && AF.hasEmitNops()) {
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while (Size % getBackend().getMinimumNopSize())
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Size += AF.getAlignment();
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}
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if (Size > AF.getMaxBytesToEmit())
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return 0;
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return Size;
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}
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case MCFragment::FT_Org: {
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const MCOrgFragment &OF = cast<MCOrgFragment>(F);
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int64_t TargetLocation;
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if (!OF.getOffset().EvaluateAsAbsolute(TargetLocation, Layout))
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report_fatal_error("expected assembly-time absolute expression");
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// FIXME: We need a way to communicate this error.
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uint64_t FragmentOffset = Layout.getFragmentOffset(&OF);
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int64_t Size = TargetLocation - FragmentOffset;
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if (Size < 0 || Size >= 0x40000000)
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report_fatal_error("invalid .org offset '" + Twine(TargetLocation) +
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"' (at offset '" + Twine(FragmentOffset) + "')");
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return Size;
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}
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case MCFragment::FT_Dwarf:
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return cast<MCDwarfLineAddrFragment>(F).getContents().size();
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case MCFragment::FT_DwarfFrame:
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return cast<MCDwarfCallFrameFragment>(F).getContents().size();
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}
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llvm_unreachable("invalid fragment kind");
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}
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void MCAsmLayout::layoutFragment(MCFragment *F) {
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MCFragment *Prev = F->getPrevNode();
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// We should never try to recompute something which is valid.
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assert(!isFragmentValid(F) && "Attempt to recompute a valid fragment!");
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// We should never try to compute the fragment layout if its predecessor
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// isn't valid.
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assert((!Prev || isFragmentValid(Prev)) &&
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"Attempt to compute fragment before its predecessor!");
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++stats::FragmentLayouts;
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// Compute fragment offset and size.
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if (Prev)
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F->Offset = Prev->Offset + getAssembler().computeFragmentSize(*this, *Prev);
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else
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F->Offset = 0;
|
|
LastValidFragment[F->getParent()] = F;
|
|
|
|
// If bundling is enabled and this fragment has instructions in it, it has to
|
|
// obey the bundling restrictions. With padding, we'll have:
|
|
//
|
|
//
|
|
// BundlePadding
|
|
// |||
|
|
// -------------------------------------
|
|
// Prev |##########| F |
|
|
// -------------------------------------
|
|
// ^
|
|
// |
|
|
// F->Offset
|
|
//
|
|
// The fragment's offset will point to after the padding, and its computed
|
|
// size won't include the padding.
|
|
//
|
|
if (Assembler.isBundlingEnabled() && F->hasInstructions()) {
|
|
assert(isa<MCEncodedFragment>(F) &&
|
|
"Only MCEncodedFragment implementations have instructions");
|
|
uint64_t FSize = Assembler.computeFragmentSize(*this, *F);
|
|
|
|
if (FSize > Assembler.getBundleAlignSize())
|
|
report_fatal_error("Fragment can't be larger than a bundle size");
|
|
|
|
uint64_t RequiredBundlePadding = computeBundlePadding(F, F->Offset, FSize);
|
|
if (RequiredBundlePadding > UINT8_MAX)
|
|
report_fatal_error("Padding cannot exceed 255 bytes");
|
|
F->setBundlePadding(static_cast<uint8_t>(RequiredBundlePadding));
|
|
F->Offset += RequiredBundlePadding;
|
|
}
|
|
}
|
|
|
|
/// \brief Write the contents of a fragment to the given object writer. Expects
|
|
/// a MCEncodedFragment.
|
|
static void writeFragmentContents(const MCFragment &F, MCObjectWriter *OW) {
|
|
const MCEncodedFragment &EF = cast<MCEncodedFragment>(F);
|
|
OW->WriteBytes(EF.getContents());
|
|
}
|
|
|
|
/// \brief Write the fragment \p F to the output file.
|
|
static void writeFragment(const MCAssembler &Asm, const MCAsmLayout &Layout,
|
|
const MCFragment &F) {
|
|
MCObjectWriter *OW = &Asm.getWriter();
|
|
|
|
// FIXME: Embed in fragments instead?
|
|
uint64_t FragmentSize = Asm.computeFragmentSize(Layout, F);
|
|
|
|
// Should NOP padding be written out before this fragment?
|
|
unsigned BundlePadding = F.getBundlePadding();
|
|
if (BundlePadding > 0) {
|
|
assert(Asm.isBundlingEnabled() &&
|
|
"Writing bundle padding with disabled bundling");
|
|
assert(F.hasInstructions() &&
|
|
"Writing bundle padding for a fragment without instructions");
|
|
|
|
unsigned TotalLength = BundlePadding + static_cast<unsigned>(FragmentSize);
|
|
if (F.alignToBundleEnd() && TotalLength > Asm.getBundleAlignSize()) {
|
|
// If the padding itself crosses a bundle boundary, it must be emitted
|
|
// in 2 pieces, since even nop instructions must not cross boundaries.
|
|
// v--------------v <- BundleAlignSize
|
|
// v---------v <- BundlePadding
|
|
// ----------------------------
|
|
// | Prev |####|####| F |
|
|
// ----------------------------
|
|
// ^-------------------^ <- TotalLength
|
|
unsigned DistanceToBoundary = TotalLength - Asm.getBundleAlignSize();
|
|
if (!Asm.getBackend().writeNopData(DistanceToBoundary, OW))
|
|
report_fatal_error("unable to write NOP sequence of " +
|
|
Twine(DistanceToBoundary) + " bytes");
|
|
BundlePadding -= DistanceToBoundary;
|
|
}
|
|
if (!Asm.getBackend().writeNopData(BundlePadding, OW))
|
|
report_fatal_error("unable to write NOP sequence of " +
|
|
Twine(BundlePadding) + " bytes");
|
|
}
|
|
|
|
// This variable (and its dummy usage) is to participate in the assert at
|
|
// the end of the function.
|
|
uint64_t Start = OW->getStream().tell();
|
|
(void) Start;
|
|
|
|
++stats::EmittedFragments;
|
|
|
|
switch (F.getKind()) {
|
|
case MCFragment::FT_Align: {
|
|
++stats::EmittedAlignFragments;
|
|
const MCAlignFragment &AF = cast<MCAlignFragment>(F);
|
|
assert(AF.getValueSize() && "Invalid virtual align in concrete fragment!");
|
|
|
|
uint64_t Count = FragmentSize / AF.getValueSize();
|
|
|
|
// FIXME: This error shouldn't actually occur (the front end should emit
|
|
// multiple .align directives to enforce the semantics it wants), but is
|
|
// severe enough that we want to report it. How to handle this?
|
|
if (Count * AF.getValueSize() != FragmentSize)
|
|
report_fatal_error("undefined .align directive, value size '" +
|
|
Twine(AF.getValueSize()) +
|
|
"' is not a divisor of padding size '" +
|
|
Twine(FragmentSize) + "'");
|
|
|
|
// See if we are aligning with nops, and if so do that first to try to fill
|
|
// the Count bytes. Then if that did not fill any bytes or there are any
|
|
// bytes left to fill use the Value and ValueSize to fill the rest.
|
|
// If we are aligning with nops, ask that target to emit the right data.
|
|
if (AF.hasEmitNops()) {
|
|
if (!Asm.getBackend().writeNopData(Count, OW))
|
|
report_fatal_error("unable to write nop sequence of " +
|
|
Twine(Count) + " bytes");
|
|
break;
|
|
}
|
|
|
|
// Otherwise, write out in multiples of the value size.
|
|
for (uint64_t i = 0; i != Count; ++i) {
|
|
switch (AF.getValueSize()) {
|
|
default: llvm_unreachable("Invalid size!");
|
|
case 1: OW->Write8 (uint8_t (AF.getValue())); break;
|
|
case 2: OW->Write16(uint16_t(AF.getValue())); break;
|
|
case 4: OW->Write32(uint32_t(AF.getValue())); break;
|
|
case 8: OW->Write64(uint64_t(AF.getValue())); break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MCFragment::FT_Data:
|
|
++stats::EmittedDataFragments;
|
|
writeFragmentContents(F, OW);
|
|
break;
|
|
|
|
case MCFragment::FT_Relaxable:
|
|
++stats::EmittedRelaxableFragments;
|
|
writeFragmentContents(F, OW);
|
|
break;
|
|
|
|
case MCFragment::FT_CompactEncodedInst:
|
|
++stats::EmittedCompactEncodedInstFragments;
|
|
writeFragmentContents(F, OW);
|
|
break;
|
|
|
|
case MCFragment::FT_Fill: {
|
|
++stats::EmittedFillFragments;
|
|
const MCFillFragment &FF = cast<MCFillFragment>(F);
|
|
|
|
assert(FF.getValueSize() && "Invalid virtual align in concrete fragment!");
|
|
|
|
for (uint64_t i = 0, e = FF.getSize() / FF.getValueSize(); i != e; ++i) {
|
|
switch (FF.getValueSize()) {
|
|
default: llvm_unreachable("Invalid size!");
|
|
case 1: OW->Write8 (uint8_t (FF.getValue())); break;
|
|
case 2: OW->Write16(uint16_t(FF.getValue())); break;
|
|
case 4: OW->Write32(uint32_t(FF.getValue())); break;
|
|
case 8: OW->Write64(uint64_t(FF.getValue())); break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MCFragment::FT_LEB: {
|
|
const MCLEBFragment &LF = cast<MCLEBFragment>(F);
|
|
OW->WriteBytes(LF.getContents().str());
|
|
break;
|
|
}
|
|
|
|
case MCFragment::FT_Org: {
|
|
++stats::EmittedOrgFragments;
|
|
const MCOrgFragment &OF = cast<MCOrgFragment>(F);
|
|
|
|
for (uint64_t i = 0, e = FragmentSize; i != e; ++i)
|
|
OW->Write8(uint8_t(OF.getValue()));
|
|
|
|
break;
|
|
}
|
|
|
|
case MCFragment::FT_Dwarf: {
|
|
const MCDwarfLineAddrFragment &OF = cast<MCDwarfLineAddrFragment>(F);
|
|
OW->WriteBytes(OF.getContents().str());
|
|
break;
|
|
}
|
|
case MCFragment::FT_DwarfFrame: {
|
|
const MCDwarfCallFrameFragment &CF = cast<MCDwarfCallFrameFragment>(F);
|
|
OW->WriteBytes(CF.getContents().str());
|
|
break;
|
|
}
|
|
}
|
|
|
|
assert(OW->getStream().tell() - Start == FragmentSize &&
|
|
"The stream should advance by fragment size");
|
|
}
|
|
|
|
void MCAssembler::writeSectionData(const MCSectionData *SD,
|
|
const MCAsmLayout &Layout) const {
|
|
// Ignore virtual sections.
|
|
if (SD->getSection().isVirtualSection()) {
|
|
assert(Layout.getSectionFileSize(SD) == 0 && "Invalid size for section!");
|
|
|
|
// Check that contents are only things legal inside a virtual section.
|
|
for (MCSectionData::const_iterator it = SD->begin(),
|
|
ie = SD->end(); it != ie; ++it) {
|
|
switch (it->getKind()) {
|
|
default: llvm_unreachable("Invalid fragment in virtual section!");
|
|
case MCFragment::FT_Data: {
|
|
// Check that we aren't trying to write a non-zero contents (or fixups)
|
|
// into a virtual section. This is to support clients which use standard
|
|
// directives to fill the contents of virtual sections.
|
|
const MCDataFragment &DF = cast<MCDataFragment>(*it);
|
|
assert(DF.fixup_begin() == DF.fixup_end() &&
|
|
"Cannot have fixups in virtual section!");
|
|
for (unsigned i = 0, e = DF.getContents().size(); i != e; ++i)
|
|
assert(DF.getContents()[i] == 0 &&
|
|
"Invalid data value for virtual section!");
|
|
break;
|
|
}
|
|
case MCFragment::FT_Align:
|
|
// Check that we aren't trying to write a non-zero value into a virtual
|
|
// section.
|
|
assert((cast<MCAlignFragment>(it)->getValueSize() == 0 ||
|
|
cast<MCAlignFragment>(it)->getValue() == 0) &&
|
|
"Invalid align in virtual section!");
|
|
break;
|
|
case MCFragment::FT_Fill:
|
|
assert((cast<MCFillFragment>(it)->getValueSize() == 0 ||
|
|
cast<MCFillFragment>(it)->getValue() == 0) &&
|
|
"Invalid fill in virtual section!");
|
|
break;
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
uint64_t Start = getWriter().getStream().tell();
|
|
(void)Start;
|
|
|
|
for (MCSectionData::const_iterator it = SD->begin(), ie = SD->end();
|
|
it != ie; ++it)
|
|
writeFragment(*this, Layout, *it);
|
|
|
|
assert(getWriter().getStream().tell() - Start ==
|
|
Layout.getSectionAddressSize(SD));
|
|
}
|
|
|
|
|
|
uint64_t MCAssembler::handleFixup(const MCAsmLayout &Layout,
|
|
MCFragment &F,
|
|
const MCFixup &Fixup) {
|
|
// Evaluate the fixup.
|
|
MCValue Target;
|
|
uint64_t FixedValue;
|
|
if (!evaluateFixup(Layout, Fixup, &F, Target, FixedValue)) {
|
|
// The fixup was unresolved, we need a relocation. Inform the object
|
|
// writer of the relocation, and give it an opportunity to adjust the
|
|
// fixup value if need be.
|
|
getWriter().RecordRelocation(*this, Layout, &F, Fixup, Target, FixedValue);
|
|
}
|
|
return FixedValue;
|
|
}
|
|
|
|
void MCAssembler::Finish() {
|
|
DEBUG_WITH_TYPE("mc-dump", {
|
|
llvm::errs() << "assembler backend - pre-layout\n--\n";
|
|
dump(); });
|
|
|
|
// Create the layout object.
|
|
MCAsmLayout Layout(*this);
|
|
|
|
// Create dummy fragments and assign section ordinals.
|
|
unsigned SectionIndex = 0;
|
|
for (MCAssembler::iterator it = begin(), ie = end(); it != ie; ++it) {
|
|
// Create dummy fragments to eliminate any empty sections, this simplifies
|
|
// layout.
|
|
if (it->getFragmentList().empty())
|
|
new MCDataFragment(it);
|
|
|
|
it->setOrdinal(SectionIndex++);
|
|
}
|
|
|
|
// Assign layout order indices to sections and fragments.
|
|
for (unsigned i = 0, e = Layout.getSectionOrder().size(); i != e; ++i) {
|
|
MCSectionData *SD = Layout.getSectionOrder()[i];
|
|
SD->setLayoutOrder(i);
|
|
|
|
unsigned FragmentIndex = 0;
|
|
for (MCSectionData::iterator iFrag = SD->begin(), iFragEnd = SD->end();
|
|
iFrag != iFragEnd; ++iFrag)
|
|
iFrag->setLayoutOrder(FragmentIndex++);
|
|
}
|
|
|
|
// Layout until everything fits.
|
|
while (layoutOnce(Layout))
|
|
continue;
|
|
|
|
DEBUG_WITH_TYPE("mc-dump", {
|
|
llvm::errs() << "assembler backend - post-relaxation\n--\n";
|
|
dump(); });
|
|
|
|
// Finalize the layout, including fragment lowering.
|
|
finishLayout(Layout);
|
|
|
|
DEBUG_WITH_TYPE("mc-dump", {
|
|
llvm::errs() << "assembler backend - final-layout\n--\n";
|
|
dump(); });
|
|
|
|
uint64_t StartOffset = OS.tell();
|
|
|
|
// Allow the object writer a chance to perform post-layout binding (for
|
|
// example, to set the index fields in the symbol data).
|
|
getWriter().ExecutePostLayoutBinding(*this, Layout);
|
|
|
|
// Evaluate and apply the fixups, generating relocation entries as necessary.
|
|
for (MCAssembler::iterator it = begin(), ie = end(); it != ie; ++it) {
|
|
for (MCSectionData::iterator it2 = it->begin(),
|
|
ie2 = it->end(); it2 != ie2; ++it2) {
|
|
MCEncodedFragmentWithFixups *F =
|
|
dyn_cast<MCEncodedFragmentWithFixups>(it2);
|
|
if (F) {
|
|
for (MCEncodedFragmentWithFixups::fixup_iterator it3 = F->fixup_begin(),
|
|
ie3 = F->fixup_end(); it3 != ie3; ++it3) {
|
|
MCFixup &Fixup = *it3;
|
|
uint64_t FixedValue = handleFixup(Layout, *F, Fixup);
|
|
getBackend().applyFixup(Fixup, F->getContents().data(),
|
|
F->getContents().size(), FixedValue);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Write the object file.
|
|
getWriter().WriteObject(*this, Layout);
|
|
|
|
stats::ObjectBytes += OS.tell() - StartOffset;
|
|
}
|
|
|
|
bool MCAssembler::fixupNeedsRelaxation(const MCFixup &Fixup,
|
|
const MCRelaxableFragment *DF,
|
|
const MCAsmLayout &Layout) const {
|
|
// If we cannot resolve the fixup value, it requires relaxation.
|
|
MCValue Target;
|
|
uint64_t Value;
|
|
if (!evaluateFixup(Layout, Fixup, DF, Target, Value))
|
|
return true;
|
|
|
|
return getBackend().fixupNeedsRelaxation(Fixup, Value, DF, Layout);
|
|
}
|
|
|
|
bool MCAssembler::fragmentNeedsRelaxation(const MCRelaxableFragment *F,
|
|
const MCAsmLayout &Layout) const {
|
|
// If this inst doesn't ever need relaxation, ignore it. This occurs when we
|
|
// are intentionally pushing out inst fragments, or because we relaxed a
|
|
// previous instruction to one that doesn't need relaxation.
|
|
if (!getBackend().mayNeedRelaxation(F->getInst()))
|
|
return false;
|
|
|
|
for (MCRelaxableFragment::const_fixup_iterator it = F->fixup_begin(),
|
|
ie = F->fixup_end(); it != ie; ++it)
|
|
if (fixupNeedsRelaxation(*it, F, Layout))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
bool MCAssembler::relaxInstruction(MCAsmLayout &Layout,
|
|
MCRelaxableFragment &F) {
|
|
if (!fragmentNeedsRelaxation(&F, Layout))
|
|
return false;
|
|
|
|
++stats::RelaxedInstructions;
|
|
|
|
// FIXME-PERF: We could immediately lower out instructions if we can tell
|
|
// they are fully resolved, to avoid retesting on later passes.
|
|
|
|
// Relax the fragment.
|
|
|
|
MCInst Relaxed;
|
|
getBackend().relaxInstruction(F.getInst(), Relaxed);
|
|
|
|
// Encode the new instruction.
|
|
//
|
|
// FIXME-PERF: If it matters, we could let the target do this. It can
|
|
// probably do so more efficiently in many cases.
|
|
SmallVector<MCFixup, 4> Fixups;
|
|
SmallString<256> Code;
|
|
raw_svector_ostream VecOS(Code);
|
|
getEmitter().EncodeInstruction(Relaxed, VecOS, Fixups);
|
|
VecOS.flush();
|
|
|
|
// Update the fragment.
|
|
F.setInst(Relaxed);
|
|
F.getContents() = Code;
|
|
F.getFixups() = Fixups;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool MCAssembler::relaxLEB(MCAsmLayout &Layout, MCLEBFragment &LF) {
|
|
int64_t Value = 0;
|
|
uint64_t OldSize = LF.getContents().size();
|
|
bool IsAbs = LF.getValue().EvaluateAsAbsolute(Value, Layout);
|
|
(void)IsAbs;
|
|
assert(IsAbs);
|
|
SmallString<8> &Data = LF.getContents();
|
|
Data.clear();
|
|
raw_svector_ostream OSE(Data);
|
|
if (LF.isSigned())
|
|
encodeSLEB128(Value, OSE);
|
|
else
|
|
encodeULEB128(Value, OSE);
|
|
OSE.flush();
|
|
return OldSize != LF.getContents().size();
|
|
}
|
|
|
|
bool MCAssembler::relaxDwarfLineAddr(MCAsmLayout &Layout,
|
|
MCDwarfLineAddrFragment &DF) {
|
|
MCContext &Context = Layout.getAssembler().getContext();
|
|
int64_t AddrDelta = 0;
|
|
uint64_t OldSize = DF.getContents().size();
|
|
bool IsAbs = DF.getAddrDelta().EvaluateAsAbsolute(AddrDelta, Layout);
|
|
(void)IsAbs;
|
|
assert(IsAbs);
|
|
int64_t LineDelta;
|
|
LineDelta = DF.getLineDelta();
|
|
SmallString<8> &Data = DF.getContents();
|
|
Data.clear();
|
|
raw_svector_ostream OSE(Data);
|
|
MCDwarfLineAddr::Encode(Context, LineDelta, AddrDelta, OSE);
|
|
OSE.flush();
|
|
return OldSize != Data.size();
|
|
}
|
|
|
|
bool MCAssembler::relaxDwarfCallFrameFragment(MCAsmLayout &Layout,
|
|
MCDwarfCallFrameFragment &DF) {
|
|
MCContext &Context = Layout.getAssembler().getContext();
|
|
int64_t AddrDelta = 0;
|
|
uint64_t OldSize = DF.getContents().size();
|
|
bool IsAbs = DF.getAddrDelta().EvaluateAsAbsolute(AddrDelta, Layout);
|
|
(void)IsAbs;
|
|
assert(IsAbs);
|
|
SmallString<8> &Data = DF.getContents();
|
|
Data.clear();
|
|
raw_svector_ostream OSE(Data);
|
|
MCDwarfFrameEmitter::EncodeAdvanceLoc(Context, AddrDelta, OSE);
|
|
OSE.flush();
|
|
return OldSize != Data.size();
|
|
}
|
|
|
|
bool MCAssembler::layoutSectionOnce(MCAsmLayout &Layout, MCSectionData &SD) {
|
|
// Holds the first fragment which needed relaxing during this layout. It will
|
|
// remain NULL if none were relaxed.
|
|
// When a fragment is relaxed, all the fragments following it should get
|
|
// invalidated because their offset is going to change.
|
|
MCFragment *FirstRelaxedFragment = NULL;
|
|
|
|
// Attempt to relax all the fragments in the section.
|
|
for (MCSectionData::iterator I = SD.begin(), IE = SD.end(); I != IE; ++I) {
|
|
// Check if this is a fragment that needs relaxation.
|
|
bool RelaxedFrag = false;
|
|
switch(I->getKind()) {
|
|
default:
|
|
break;
|
|
case MCFragment::FT_Relaxable:
|
|
assert(!getRelaxAll() &&
|
|
"Did not expect a MCRelaxableFragment in RelaxAll mode");
|
|
RelaxedFrag = relaxInstruction(Layout, *cast<MCRelaxableFragment>(I));
|
|
break;
|
|
case MCFragment::FT_Dwarf:
|
|
RelaxedFrag = relaxDwarfLineAddr(Layout,
|
|
*cast<MCDwarfLineAddrFragment>(I));
|
|
break;
|
|
case MCFragment::FT_DwarfFrame:
|
|
RelaxedFrag =
|
|
relaxDwarfCallFrameFragment(Layout,
|
|
*cast<MCDwarfCallFrameFragment>(I));
|
|
break;
|
|
case MCFragment::FT_LEB:
|
|
RelaxedFrag = relaxLEB(Layout, *cast<MCLEBFragment>(I));
|
|
break;
|
|
}
|
|
if (RelaxedFrag && !FirstRelaxedFragment)
|
|
FirstRelaxedFragment = I;
|
|
}
|
|
if (FirstRelaxedFragment) {
|
|
Layout.invalidateFragmentsFrom(FirstRelaxedFragment);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool MCAssembler::layoutOnce(MCAsmLayout &Layout) {
|
|
++stats::RelaxationSteps;
|
|
|
|
bool WasRelaxed = false;
|
|
for (iterator it = begin(), ie = end(); it != ie; ++it) {
|
|
MCSectionData &SD = *it;
|
|
while (layoutSectionOnce(Layout, SD))
|
|
WasRelaxed = true;
|
|
}
|
|
|
|
return WasRelaxed;
|
|
}
|
|
|
|
void MCAssembler::finishLayout(MCAsmLayout &Layout) {
|
|
// The layout is done. Mark every fragment as valid.
|
|
for (unsigned int i = 0, n = Layout.getSectionOrder().size(); i != n; ++i) {
|
|
Layout.getFragmentOffset(&*Layout.getSectionOrder()[i]->rbegin());
|
|
}
|
|
}
|
|
|
|
// Debugging methods
|
|
|
|
namespace llvm {
|
|
|
|
raw_ostream &operator<<(raw_ostream &OS, const MCFixup &AF) {
|
|
OS << "<MCFixup" << " Offset:" << AF.getOffset()
|
|
<< " Value:" << *AF.getValue()
|
|
<< " Kind:" << AF.getKind() << ">";
|
|
return OS;
|
|
}
|
|
|
|
}
|
|
|
|
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
|
|
void MCFragment::dump() {
|
|
raw_ostream &OS = llvm::errs();
|
|
|
|
OS << "<";
|
|
switch (getKind()) {
|
|
case MCFragment::FT_Align: OS << "MCAlignFragment"; break;
|
|
case MCFragment::FT_Data: OS << "MCDataFragment"; break;
|
|
case MCFragment::FT_CompactEncodedInst:
|
|
OS << "MCCompactEncodedInstFragment"; break;
|
|
case MCFragment::FT_Fill: OS << "MCFillFragment"; break;
|
|
case MCFragment::FT_Relaxable: OS << "MCRelaxableFragment"; break;
|
|
case MCFragment::FT_Org: OS << "MCOrgFragment"; break;
|
|
case MCFragment::FT_Dwarf: OS << "MCDwarfFragment"; break;
|
|
case MCFragment::FT_DwarfFrame: OS << "MCDwarfCallFrameFragment"; break;
|
|
case MCFragment::FT_LEB: OS << "MCLEBFragment"; break;
|
|
}
|
|
|
|
OS << "<MCFragment " << (void*) this << " LayoutOrder:" << LayoutOrder
|
|
<< " Offset:" << Offset
|
|
<< " HasInstructions:" << hasInstructions()
|
|
<< " BundlePadding:" << static_cast<unsigned>(getBundlePadding()) << ">";
|
|
|
|
switch (getKind()) {
|
|
case MCFragment::FT_Align: {
|
|
const MCAlignFragment *AF = cast<MCAlignFragment>(this);
|
|
if (AF->hasEmitNops())
|
|
OS << " (emit nops)";
|
|
OS << "\n ";
|
|
OS << " Alignment:" << AF->getAlignment()
|
|
<< " Value:" << AF->getValue() << " ValueSize:" << AF->getValueSize()
|
|
<< " MaxBytesToEmit:" << AF->getMaxBytesToEmit() << ">";
|
|
break;
|
|
}
|
|
case MCFragment::FT_Data: {
|
|
const MCDataFragment *DF = cast<MCDataFragment>(this);
|
|
OS << "\n ";
|
|
OS << " Contents:[";
|
|
const SmallVectorImpl<char> &Contents = DF->getContents();
|
|
for (unsigned i = 0, e = Contents.size(); i != e; ++i) {
|
|
if (i) OS << ",";
|
|
OS << hexdigit((Contents[i] >> 4) & 0xF) << hexdigit(Contents[i] & 0xF);
|
|
}
|
|
OS << "] (" << Contents.size() << " bytes)";
|
|
|
|
if (DF->fixup_begin() != DF->fixup_end()) {
|
|
OS << ",\n ";
|
|
OS << " Fixups:[";
|
|
for (MCDataFragment::const_fixup_iterator it = DF->fixup_begin(),
|
|
ie = DF->fixup_end(); it != ie; ++it) {
|
|
if (it != DF->fixup_begin()) OS << ",\n ";
|
|
OS << *it;
|
|
}
|
|
OS << "]";
|
|
}
|
|
break;
|
|
}
|
|
case MCFragment::FT_CompactEncodedInst: {
|
|
const MCCompactEncodedInstFragment *CEIF =
|
|
cast<MCCompactEncodedInstFragment>(this);
|
|
OS << "\n ";
|
|
OS << " Contents:[";
|
|
const SmallVectorImpl<char> &Contents = CEIF->getContents();
|
|
for (unsigned i = 0, e = Contents.size(); i != e; ++i) {
|
|
if (i) OS << ",";
|
|
OS << hexdigit((Contents[i] >> 4) & 0xF) << hexdigit(Contents[i] & 0xF);
|
|
}
|
|
OS << "] (" << Contents.size() << " bytes)";
|
|
break;
|
|
}
|
|
case MCFragment::FT_Fill: {
|
|
const MCFillFragment *FF = cast<MCFillFragment>(this);
|
|
OS << " Value:" << FF->getValue() << " ValueSize:" << FF->getValueSize()
|
|
<< " Size:" << FF->getSize();
|
|
break;
|
|
}
|
|
case MCFragment::FT_Relaxable: {
|
|
const MCRelaxableFragment *F = cast<MCRelaxableFragment>(this);
|
|
OS << "\n ";
|
|
OS << " Inst:";
|
|
F->getInst().dump_pretty(OS);
|
|
break;
|
|
}
|
|
case MCFragment::FT_Org: {
|
|
const MCOrgFragment *OF = cast<MCOrgFragment>(this);
|
|
OS << "\n ";
|
|
OS << " Offset:" << OF->getOffset() << " Value:" << OF->getValue();
|
|
break;
|
|
}
|
|
case MCFragment::FT_Dwarf: {
|
|
const MCDwarfLineAddrFragment *OF = cast<MCDwarfLineAddrFragment>(this);
|
|
OS << "\n ";
|
|
OS << " AddrDelta:" << OF->getAddrDelta()
|
|
<< " LineDelta:" << OF->getLineDelta();
|
|
break;
|
|
}
|
|
case MCFragment::FT_DwarfFrame: {
|
|
const MCDwarfCallFrameFragment *CF = cast<MCDwarfCallFrameFragment>(this);
|
|
OS << "\n ";
|
|
OS << " AddrDelta:" << CF->getAddrDelta();
|
|
break;
|
|
}
|
|
case MCFragment::FT_LEB: {
|
|
const MCLEBFragment *LF = cast<MCLEBFragment>(this);
|
|
OS << "\n ";
|
|
OS << " Value:" << LF->getValue() << " Signed:" << LF->isSigned();
|
|
break;
|
|
}
|
|
}
|
|
OS << ">";
|
|
}
|
|
|
|
void MCSectionData::dump() {
|
|
raw_ostream &OS = llvm::errs();
|
|
|
|
OS << "<MCSectionData";
|
|
OS << " Alignment:" << getAlignment()
|
|
<< " Fragments:[\n ";
|
|
for (iterator it = begin(), ie = end(); it != ie; ++it) {
|
|
if (it != begin()) OS << ",\n ";
|
|
it->dump();
|
|
}
|
|
OS << "]>";
|
|
}
|
|
|
|
void MCSymbolData::dump() {
|
|
raw_ostream &OS = llvm::errs();
|
|
|
|
OS << "<MCSymbolData Symbol:" << getSymbol()
|
|
<< " Fragment:" << getFragment() << " Offset:" << getOffset()
|
|
<< " Flags:" << getFlags() << " Index:" << getIndex();
|
|
if (isCommon())
|
|
OS << " (common, size:" << getCommonSize()
|
|
<< " align: " << getCommonAlignment() << ")";
|
|
if (isExternal())
|
|
OS << " (external)";
|
|
if (isPrivateExtern())
|
|
OS << " (private extern)";
|
|
OS << ">";
|
|
}
|
|
|
|
void MCAssembler::dump() {
|
|
raw_ostream &OS = llvm::errs();
|
|
|
|
OS << "<MCAssembler\n";
|
|
OS << " Sections:[\n ";
|
|
for (iterator it = begin(), ie = end(); it != ie; ++it) {
|
|
if (it != begin()) OS << ",\n ";
|
|
it->dump();
|
|
}
|
|
OS << "],\n";
|
|
OS << " Symbols:[";
|
|
|
|
for (symbol_iterator it = symbol_begin(), ie = symbol_end(); it != ie; ++it) {
|
|
if (it != symbol_begin()) OS << ",\n ";
|
|
it->dump();
|
|
}
|
|
OS << "]>\n";
|
|
}
|
|
#endif
|
|
|
|
// anchors for MC*Fragment vtables
|
|
void MCEncodedFragment::anchor() { }
|
|
void MCEncodedFragmentWithFixups::anchor() { }
|
|
void MCDataFragment::anchor() { }
|
|
void MCCompactEncodedInstFragment::anchor() { }
|
|
void MCRelaxableFragment::anchor() { }
|
|
void MCAlignFragment::anchor() { }
|
|
void MCFillFragment::anchor() { }
|
|
void MCOrgFragment::anchor() { }
|
|
void MCLEBFragment::anchor() { }
|
|
void MCDwarfLineAddrFragment::anchor() { }
|
|
void MCDwarfCallFrameFragment::anchor() { }
|