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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.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99244 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2010-03-23 01:39:05 +00:00
parent 1ccd91a5b1
commit 9799de910e
2 changed files with 42 additions and 21 deletions
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45
include/llvm/MC/MCAssembler.h
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@ -180,28 +180,57 @@ public:
virtual void dump(); virtual void dump();
}; };
// FIXME: This current incarnation of MCInstFragment doesn't make much sense, as
// it is almost entirely a duplicate of MCDataFragment. If we decide to stick
// with this approach (as opposed to making MCInstFragment a very light weight
// object with just the MCInst and a code size, then we should just change
// MCDataFragment to have an optional MCInst at its end.
class MCInstFragment : public MCFragment { class MCInstFragment : public MCFragment {
/// Inst - The instruction this is a fragment for. /// Inst - The instruction this is a fragment for.
MCInst Inst; MCInst Inst;
/// InstSize - The size of the currently encoded instruction. /// InstSize - The size of the currently encoded instruction.
unsigned InstSize; SmallString<8> Code;
/// Fixups - The list of fixups in this fragment.
SmallVector<MCAsmFixup, 1> Fixups;
public: public:
MCInstFragment(MCInst _Inst, unsigned _InstSize, MCSectionData *SD = 0) typedef SmallVectorImpl<MCAsmFixup>::const_iterator const_fixup_iterator;
: MCFragment(FT_Inst, SD), Inst(_Inst), InstSize(_InstSize) {} typedef SmallVectorImpl<MCAsmFixup>::iterator fixup_iterator;
public:
MCInstFragment(MCInst _Inst, MCSectionData *SD = 0)
: MCFragment(FT_Inst, SD), Inst(_Inst) {
}
/// @name Accessors /// @name Accessors
/// @{ /// @{
unsigned getInstSize() const { return InstSize; } SmallVectorImpl<char> &getCode() { return Code; }
const SmallVectorImpl<char> &getCode() const { return Code; }
unsigned getInstSize() const { return Code.size(); }
MCInst &getInst() { return Inst; }
const MCInst &getInst() const { return Inst; } const MCInst &getInst() const { return Inst; }
void setInst(MCInst Inst, unsigned InstSize) { void setInst(MCInst Value) { Inst = Value; }
this->Inst = Inst;
this->InstSize = InstSize; /// @}
} /// @name Fixup Access
/// @{
SmallVectorImpl<MCAsmFixup> &getFixups() { return Fixups; }
const SmallVectorImpl<MCAsmFixup> &getFixups() const { return Fixups; }
fixup_iterator fixup_begin() { return Fixups.begin(); }
const_fixup_iterator fixup_begin() const { return Fixups.begin(); }
fixup_iterator fixup_end() {return Fixups.end();}
const_fixup_iterator fixup_end() const {return Fixups.end();}
size_t fixup_size() const { return Fixups.size(); }
/// @} /// @}

18
lib/MC/MCAssembler.cpp
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@ -773,22 +773,14 @@ void MCAssembler::FinishLayout(MCAsmLayout &Layout) {
SD.getFragmentList().insert(it2, DF); SD.getFragmentList().insert(it2, DF);
// Update the data fragments layout data. // Update the data fragments layout data.
DF->setParent(IF->getParent());
DF->setOffset(IF->getOffset()); DF->setOffset(IF->getOffset());
DF->setFileSize(IF->getInstSize()); DF->setFileSize(IF->getInstSize());
// Encode the final instruction. // Copy in the data and the fixups.
SmallVector<MCFixup, 4> Fixups; DF->getContents().append(IF->getCode().begin(), IF->getCode().end());
raw_svector_ostream VecOS(DF->getContents()); for (unsigned i = 0, e = IF->getFixups().size(); i != e; ++i)
getEmitter().EncodeInstruction(IF->getInst(), VecOS, Fixups); DF->getFixups().push_back(IF->getFixups()[i]);
// Copy over the fixups.
//
// FIXME-PERF: Encode fixups directly into the data fragment as well.
for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
MCFixup &F = Fixups[i];
DF->addFixup(MCAsmFixup(DF->getContents().size()+F.getOffset(),
*F.getValue(), F.getKind()));
}
// Delete the instruction fragment and update the iterator. // Delete the instruction fragment and update the iterator.
SD.getFragmentList().erase(IF); SD.getFragmentList().erase(IF);