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MC: Tweak MCInstFragment to include the encoded data and fixups, so that we don't need to recompute them during relaxation. I will revisit this once all the other pieces of fast relaxation are in place.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99244 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -180,28 +180,57 @@ public:
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virtual void dump();
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};
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// FIXME: This current incarnation of MCInstFragment doesn't make much sense, as
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// it is almost entirely a duplicate of MCDataFragment. If we decide to stick
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// with this approach (as opposed to making MCInstFragment a very light weight
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// object with just the MCInst and a code size, then we should just change
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// MCDataFragment to have an optional MCInst at its end.
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class MCInstFragment : public MCFragment {
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/// Inst - The instruction this is a fragment for.
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MCInst Inst;
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/// InstSize - The size of the currently encoded instruction.
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unsigned InstSize;
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SmallString<8> Code;
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/// Fixups - The list of fixups in this fragment.
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SmallVector<MCAsmFixup, 1> Fixups;
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public:
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MCInstFragment(MCInst _Inst, unsigned _InstSize, MCSectionData *SD = 0)
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: MCFragment(FT_Inst, SD), Inst(_Inst), InstSize(_InstSize) {}
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typedef SmallVectorImpl<MCAsmFixup>::const_iterator const_fixup_iterator;
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typedef SmallVectorImpl<MCAsmFixup>::iterator fixup_iterator;
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public:
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MCInstFragment(MCInst _Inst, MCSectionData *SD = 0)
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: MCFragment(FT_Inst, SD), Inst(_Inst) {
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}
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/// @name Accessors
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/// @{
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unsigned getInstSize() const { return InstSize; }
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SmallVectorImpl<char> &getCode() { return Code; }
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const SmallVectorImpl<char> &getCode() const { return Code; }
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unsigned getInstSize() const { return Code.size(); }
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MCInst &getInst() { return Inst; }
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const MCInst &getInst() const { return Inst; }
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void setInst(MCInst Inst, unsigned InstSize) {
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this->Inst = Inst;
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this->InstSize = InstSize;
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}
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void setInst(MCInst Value) { Inst = Value; }
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/// @}
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/// @name Fixup Access
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/// @{
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SmallVectorImpl<MCAsmFixup> &getFixups() { return Fixups; }
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const SmallVectorImpl<MCAsmFixup> &getFixups() const { return Fixups; }
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fixup_iterator fixup_begin() { return Fixups.begin(); }
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const_fixup_iterator fixup_begin() const { return Fixups.begin(); }
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fixup_iterator fixup_end() {return Fixups.end();}
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const_fixup_iterator fixup_end() const {return Fixups.end();}
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size_t fixup_size() const { return Fixups.size(); }
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/// @}
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@ -773,22 +773,14 @@ void MCAssembler::FinishLayout(MCAsmLayout &Layout) {
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SD.getFragmentList().insert(it2, DF);
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// Update the data fragments layout data.
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DF->setParent(IF->getParent());
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DF->setOffset(IF->getOffset());
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DF->setFileSize(IF->getInstSize());
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// Encode the final instruction.
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SmallVector<MCFixup, 4> Fixups;
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raw_svector_ostream VecOS(DF->getContents());
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getEmitter().EncodeInstruction(IF->getInst(), VecOS, Fixups);
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// Copy over the fixups.
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//
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// FIXME-PERF: Encode fixups directly into the data fragment as well.
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for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
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MCFixup &F = Fixups[i];
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DF->addFixup(MCAsmFixup(DF->getContents().size()+F.getOffset(),
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*F.getValue(), F.getKind()));
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}
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// Copy in the data and the fixups.
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DF->getContents().append(IF->getCode().begin(), IF->getCode().end());
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for (unsigned i = 0, e = IF->getFixups().size(); i != e; ++i)
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DF->getFixups().push_back(IF->getFixups()[i]);
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// Delete the instruction fragment and update the iterator.
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SD.getFragmentList().erase(IF);
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