Refactor MCInstFragment and MCDataFragment to adhere to a common interface,
which removes code duplication and prepares the ground for future additions.
Full discussion:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20121203/158233.html
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169626 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCAssembler.cpp b/lib/MC/MCAssembler.cpp
index 5032e6f..b2136e5 100644
--- a/lib/MC/MCAssembler.cpp
+++ b/lib/MC/MCAssembler.cpp
@@ -168,6 +168,11 @@
/* *** */
+MCEncodedFragment::~MCEncodedFragment() {
+}
+
+/* *** */
+
MCSectionData::MCSectionData() : Section(0) {}
MCSectionData::MCSectionData(const MCSection &_Section, MCAssembler *A)
@@ -382,9 +387,16 @@
LastValidFragment[F->getParent()] = F;
}
-/// WriteFragmentData - Write the \p F data to the output file.
-static void WriteFragmentData(const MCAssembler &Asm, const MCAsmLayout &Layout,
- const MCFragment &F) {
+/// \brief Write the contents of a fragment to the given object writer. Expects
+/// a MCEncodedFragment.
+static void writeFragmentContents(const MCFragment &F, MCObjectWriter *OW) {
+ MCEncodedFragment &EF = cast<MCEncodedFragment>(F);
+ OW->WriteBytes(EF.getContents().str());
+}
+
+/// \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();
uint64_t Start = OW->getStream().tell();
(void) Start;
@@ -433,13 +445,15 @@
break;
}
- case MCFragment::FT_Data: {
+ case MCFragment::FT_Data:
++stats::EmittedDataFragments;
- MCDataFragment &DF = cast<MCDataFragment>(F);
- assert(FragmentSize == DF.getContents().size() && "Invalid size!");
- OW->WriteBytes(DF.getContents().str());
+ writeFragmentContents(F, OW);
break;
- }
+
+ case MCFragment::FT_Inst:
+ ++stats::EmittedInstFragments;
+ writeFragmentContents(F, OW);
+ break;
case MCFragment::FT_Fill: {
MCFillFragment &FF = cast<MCFillFragment>(F);
@@ -458,13 +472,6 @@
break;
}
- case MCFragment::FT_Inst: {
- ++stats::EmittedInstFragments;
- MCInstFragment &IF = cast<MCInstFragment>(F);
- OW->WriteBytes(StringRef(IF.getCode().begin(), IF.getCode().size()));
- break;
- }
-
case MCFragment::FT_LEB: {
MCLEBFragment &LF = cast<MCLEBFragment>(F);
OW->WriteBytes(LF.getContents().str());
@@ -538,9 +545,9 @@
uint64_t Start = getWriter().getStream().tell();
(void)Start;
- for (MCSectionData::const_iterator it = SD->begin(),
- ie = SD->end(); it != ie; ++it)
- WriteFragmentData(*this, Layout, *it);
+ 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));
@@ -617,24 +624,14 @@
for (MCAssembler::iterator it = begin(), ie = end(); it != ie; ++it) {
for (MCSectionData::iterator it2 = it->begin(),
ie2 = it->end(); it2 != ie2; ++it2) {
- MCDataFragment *DF = dyn_cast<MCDataFragment>(it2);
- if (DF) {
- for (MCDataFragment::fixup_iterator it3 = DF->fixup_begin(),
- ie3 = DF->fixup_end(); it3 != ie3; ++it3) {
+ MCEncodedFragment *F = dyn_cast<MCEncodedFragment>(it2);
+ if (F) {
+ for (MCEncodedFragment::fixup_iterator it3 = F->fixup_begin(),
+ ie3 = F->fixup_end(); it3 != ie3; ++it3) {
MCFixup &Fixup = *it3;
- uint64_t FixedValue = handleFixup(Layout, *DF, Fixup);
- getBackend().applyFixup(Fixup, DF->getContents().data(),
- DF->getContents().size(), FixedValue);
- }
- }
- MCInstFragment *IF = dyn_cast<MCInstFragment>(it2);
- if (IF) {
- for (MCInstFragment::fixup_iterator it3 = IF->fixup_begin(),
- ie3 = IF->fixup_end(); it3 != ie3; ++it3) {
- MCFixup &Fixup = *it3;
- uint64_t FixedValue = handleFixup(Layout, *IF, Fixup);
- getBackend().applyFixup(Fixup, IF->getCode().data(),
- IF->getCode().size(), FixedValue);
+ uint64_t FixedValue = handleFixup(Layout, *F, Fixup);
+ getBackend().applyFixup(Fixup, F->getContents().data(),
+ F->getContents().size(), FixedValue);
}
}
}
@@ -704,11 +701,8 @@
// Update the instruction fragment.
IF.setInst(Relaxed);
- IF.getCode() = Code;
- IF.getFixups().clear();
- // FIXME: Eliminate copy.
- for (unsigned i = 0, e = Fixups.size(); i != e; ++i)
- IF.getFixups().push_back(Fixups[i]);
+ IF.getContents() = Code;
+ IF.getFixups() = Fixups;
return true;
}
@@ -977,6 +971,7 @@
#endif
// anchors for MC*Fragment vtables
+void MCEncodedFragment::anchor() { }
void MCDataFragment::anchor() { }
void MCInstFragment::anchor() { }
void MCAlignFragment::anchor() { }