Added small section asm emition logic for mips.
Fixed small bug.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53908 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Mips/MipsTargetAsmInfo.cpp b/lib/Target/Mips/MipsTargetAsmInfo.cpp
index 40c6e7f..4678c3b 100644
--- a/lib/Target/Mips/MipsTargetAsmInfo.cpp
+++ b/lib/Target/Mips/MipsTargetAsmInfo.cpp
@@ -19,6 +19,8 @@
MipsTargetAsmInfo::MipsTargetAsmInfo(const MipsTargetMachine &TM):
ELFTargetAsmInfo(TM) {
+ MipsTM = &TM;
+
AlignmentIsInBytes = false;
COMMDirectiveTakesAlignment = true;
Data16bitsDirective = "\t.half\t";
@@ -37,5 +39,66 @@
JumpTableDirective = "\t.word\t";
else
JumpTableDirective = "\t.gpword\t";
+
+ SmallDataSection = getNamedSection("\t.sdata", SectionFlags::Writeable);
+ SmallBSSSection = getNamedSection("\t.sbss",
+ SectionFlags::Writeable | SectionFlags::BSS);
+}
+static bool isSuitableForBSS(const GlobalVariable *GV) {
+ if (!GV->hasInitializer())
+ return true;
+
+ // Leave constant zeros in readonly constant sections, so they can be shared
+ Constant *C = GV->getInitializer();
+ return (C->isNullValue() && !GV->isConstant() && !NoZerosInBSS);
+}
+
+SectionKind::Kind
+MipsTargetAsmInfo::SectionKindForGlobal(const GlobalValue *GV) const {
+ const TargetData *TD = ETM->getTargetData();
+ const GlobalVariable *GVA = dyn_cast<GlobalVariable>(GV);
+
+ if (!GVA)
+ return ELFTargetAsmInfo::SectionKindForGlobal(GV);
+
+ // if this is a internal constant string, there is a special
+ // section for it, but not in small data/bss.
+ if (GVA->hasInitializer() && GV->hasInternalLinkage()) {
+ Constant *C = GVA->getInitializer();
+ const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
+ if (CVA && CVA->isCString())
+ return ELFTargetAsmInfo::SectionKindForGlobal(GV);
+ }
+
+ const Type *Ty = GV->getType()->getElementType();
+ unsigned Size = TD->getABITypeSize(Ty);
+ unsigned Threshold =
+ MipsTM->getSubtarget<MipsSubtarget>().getSSectionThreshold();
+
+ if (Size > 0 && Size <= Threshold) {
+ if (isSuitableForBSS(GVA))
+ return SectionKind::SmallBSS;
+ else
+ return SectionKind::SmallData;
+ }
+
+ return ELFTargetAsmInfo::SectionKindForGlobal(GV);
+}
+
+const Section*
+MipsTargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV) const {
+ SectionKind::Kind K = SectionKindForGlobal(GV);
+ const GlobalVariable *GVA = dyn_cast<GlobalVariable>(GV);
+
+ if (GVA && (!GVA->isWeakForLinker()))
+ switch (K) {
+ case SectionKind::SmallData:
+ return getSmallDataSection();
+ case SectionKind::SmallBSS:
+ return getSmallBSSSection();
+ default: break;
+ }
+
+ return ELFTargetAsmInfo::SelectSectionForGlobal(GV);
}