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Make isel determine where to emit PLT-relative calls instead of having

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asmprinter do it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75104 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-07-09 05:02:21 +00:00
parent f9e68accee
commit 48a7d0257f
2 changed files with 31 additions and 18 deletions
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21
lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
View File

@ -282,10 +282,6 @@ bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
return false;
}
static inline bool shouldPrintPLT(TargetMachine &TM, const X86Subtarget* ST) {
return ST->isTargetELF() && TM.getRelocationModel() == Reloc::PIC_;
}
/// print_pcrel_imm - This is used to print an immediate value that ends up
/// being encoded as a pc-relative value. These print slightly differently, for
/// example, a $ is not emitted.
@ -352,14 +348,11 @@ void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
O << "__imp_";
O << Name;
if (shouldPrintPLT(TM, Subtarget)) {
// Assemble call via PLT for externally visible symbols
if (!GV->hasHiddenVisibility() && !GV->hasProtectedVisibility() &&
!GV->hasLocalLinkage()) {
O << "@PLT";
assert(MO.getTargetFlags() == 0);
}
}
// Assemble call via PLT for externally visible symbols.
if (MO.getTargetFlags() == X86II::MO_PLT)
O << "@PLT";
if (Subtarget->isTargetCygMing() && GV->isDeclaration())
// Save function name for later type emission
FnStubs.insert(Name);
@ -400,10 +393,8 @@ void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
O << ']';
}
if (shouldPrintPLT(TM, Subtarget)) {
if (MO.getTargetFlags() == X86II::MO_PLT)
O << "@PLT";
assert(MO.getTargetFlags() == 0);
}
if (needCloseParen)
O << ')';

28
lib/Target/X86/X86ISelLowering.cpp
View File

@ -1901,11 +1901,33 @@ SDValue X86TargetLowering::LowerCALL(SDValue Op, SelectionDAG &DAG) {
// We should use extra load for direct calls to dllimported functions in
// non-JIT mode.
if (!Subtarget->GVRequiresExtraLoad(G->getGlobal(),
getTargetMachine(), true))
getTargetMachine(), true)) {
unsigned char OpFlags = 0;
// On ELF targets, in both X86-64 and X86-32 mode, direct calls to
// external symbols most go through the PLT in PIC mode. If the symbol
// has hidden or protected visibility, or if it is static or local, then
// we don't need to use the PLT - we can directly call it.
if (Subtarget->isTargetELF() &&
getTargetMachine().getRelocationModel() == Reloc::PIC_ &&
G->getGlobal()->hasDefaultVisibility() &&
!G->getGlobal()->hasLocalLinkage())
OpFlags = X86II::MO_PLT;
Callee = DAG.getTargetGlobalAddress(G->getGlobal(), getPointerTy(),
G->getOffset());
G->getOffset(), OpFlags);
}
} else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
Callee = DAG.getTargetExternalSymbol(S->getSymbol(), getPointerTy());
unsigned char OpFlags = 0;
// On ELF targets, in either X86-64 or X86-32 mode, direct calls to external
// symbols should go through the PLT.
if (Subtarget->isTargetELF() &&
getTargetMachine().getRelocationModel() == Reloc::PIC_)
OpFlags = X86II::MO_PLT;
Callee = DAG.getTargetExternalSymbol(S->getSymbol(), getPointerTy(),
OpFlags);
} else if (IsTailCall) {
unsigned Opc = Is64Bit ? X86::R11 : X86::EAX;