/// DataSection - Section directive for standard data.
///
const char *DataSection; // Defaults to ".data".
+
+ /// BSSSection - Section directive for uninitialized data.
+ ///
+ const char *BSSSection; // Default to ".bss".
/// AddressSize - Size of addresses used in file.
///
const char *getDataSection() const {
return DataSection;
}
+ const char *getBSSSection() const {
+ return BSSSection;
+ }
unsigned getAddressSize() const {
return AddressSize;
}
/// generate libcalls to the software floating point library instead of
/// target FP instructions.
extern bool UseSoftFloat;
+
+ extern bool NoZerosInBSS;
} // End llvm namespace
#endif
TargetAsmInfo::TargetAsmInfo() :
TextSection(".text"),
DataSection(".data"),
+ BSSSection(".bss"),
AddressSize(4),
NeedsSet(false),
MaxInstLength(4),
bool UnsafeFPMath;
bool FiniteOnlyFPMathOption;
bool UseSoftFloat;
+ bool NoZerosInBSS;
Reloc::Model RelocationModel;
CodeModel::Model CMModel;
}
cl::desc("Generate software floating point library calls"),
cl::location(UseSoftFloat),
cl::init(false));
+ cl::opt<bool, true>
+ DontPlaceZerosInBSS("nozero-initialized-in-bss",
+ cl::desc("Don't place zero-initialized symbols into bss section"),
+ cl::location(NoZerosInBSS),
+ cl::init(false));
cl::opt<llvm::Reloc::Model, true>
DefRelocationModel(
O << Offset;
if (isMemOp) {
- if (isExt) {
- if (Subtarget->isPICStyleGOT()) {
+ if (Subtarget->isPICStyleGOT()) {
+ if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
O << "@GOT";
- } else if (Subtarget->isPICStyleRIPRel()) {
+ else
+ O << "@GOTOFF";
+ } else
+ if (isExt && Subtarget->isPICStyleRIPRel())
O << "@GOTPCREL(%rip)";
- } else if (Subtarget->is64Bit() && !NotRIPRel)
- // Use rip when possible to reduce code size, except when
- // index or base register are also part of the address. e.g.
- // foo(%rip)(%rcx,%rax,4) is not legal
- O << "(%rip)";
- } else {
- if (Subtarget->is64Bit() && !NotRIPRel)
+ else if (Subtarget->is64Bit() && !NotRIPRel)
+ // Use rip when possible to reduce code size, except when
+ // index or base register are also part of the address. e.g.
+ // foo(%rip)(%rcx,%rax,4) is not legal
O << "(%rip)";
- else if (Subtarget->isPICStyleGOT())
- O << "@GOTOFF";
- }
}
return;
#include "llvm/Assembly/Writer.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/Target/TargetOptions.h"
using namespace llvm;
static X86FunctionInfo calculateFunctionInfo(const Function *F,
O << "\t.zerofill __DATA__, __common, " << name << ", "
<< Size << ", " << Align;
} else {
- SwitchToDataSection(TAI->getDataSection(), I);
+ if (!NoZerosInBSS && TAI->getBSSSection())
+ SwitchToDataSection(TAI->getBSSSection(), I);
+ else
+ SwitchToDataSection(TAI->getDataSection(), I);
if (TAI->getLCOMMDirective() != NULL) {
if (I->hasInternalLinkage()) {
O << TAI->getLCOMMDirective() << name << "," << Size;
SwitchToDataSection(SectionName.c_str());
} else {
- SwitchToDataSection(TAI->getDataSection(), I);
+ if (C->isNullValue() && !NoZerosInBSS && TAI->getBSSSection())
+ SwitchToDataSection(TAI->getBSSSection(), I);
+ else
+ SwitchToDataSection(TAI->getDataSection(), I);
}
break;
bool isDirectCall) const
{
if (TM.getRelocationModel() != Reloc::Static)
- if (isTargetDarwin() || isPICStyleGOT()) {
+ if (isTargetDarwin()) {
return (!isDirectCall &&
(GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
(GV->isExternal() && !GV->hasNotBeenReadFromBytecode())));
+ } else if (isPICStyleGOT()) {
+ // Extra load is needed for all non-statics.
+ return (!isDirectCall &&
+ (GV->isExternal() || !GV->hasInternalLinkage()));
} else if (isTargetCygMing() || isTargetWindows()) {
return (GV->hasDLLImportLinkage());
}
--- /dev/null
+; RUN: llvm-as < %s | llc -mtriple=i686-pc-linux-gnu -relocation-model=pic &&
+; RUN: llvm-as < %s | llc -mtriple=i686-pc-linux-gnu -relocation-model=pic | grep _GLOBAL_OFFSET_TABLE_ &&
+; RUN: llvm-as < %s | llc -mtriple=i686-pc-linux-gnu -relocation-model=pic | grep piclabel | wc -l | grep 3 &&
+; RUN: llvm-as < %s | llc -mtriple=i686-pc-linux-gnu -relocation-model=pic | grep GOT | wc -l | grep 3
+
+%ptr = global i32* null
+%dst = global i32 0
+%src = global i32 0
+
+define void %foo() {
+entry:
+ store i32* %dst, i32** %ptr
+ %tmp.s = load i32* %src
+ store i32 %tmp.s, i32* %dst
+ ret void
+}
+