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[XCOFF][AIX] Check linkage on the function, and two fixes for comments

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This is a follow up commit to address post-commit comment in D70443

Differential revision: https://reviews.llvm.org/D70443
This commit is contained in:
jasonliu 2019-11-26 16:05:26 +00:00
parent 5fa4ad5707
commit dd53195fe6
3 changed files with 41 additions and 7 deletions
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2
lib/MC/XCOFFObjectWriter.cpp
View File

@ -574,7 +574,7 @@ void XCOFFObjectWriter::assignAddressesAndIndices(const MCAsmLayout &Layout) {
// yet, so start at index 0.
uint32_t SymbolTableIndex = 0;
// Calculate undefined symbol's indices.
// Calculate indices for undefined symbols.
for (auto &Csect : UndefinedCsects) {
Csect.Size = 0;
Csect.Address = 0;

16
lib/Target/PowerPC/PPCISelLowering.cpp
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@ -52,6 +52,7 @@
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/IR/CallSite.h"
@ -5326,16 +5327,19 @@ SDValue PPCTargetLowering::FinishCall(
GlobalAddressSDNode *G = cast<GlobalAddressSDNode>(Callee);
auto &Context = DAG.getMachineFunction().getMMI().getContext();
const GlobalObject *GO = cast<GlobalObject>(G->getGlobal());
MCSymbolXCOFF *S = cast<MCSymbolXCOFF>(Context.getOrCreateSymbol(
Twine(".") + Twine(G->getGlobal()->getName())));
Twine(".") + Twine(GO->getName())));
const GlobalValue *GV = G->getGlobal();
if (GV && GV->isDeclaration() && !S->hasContainingCsect()) {
// On AIX, undefined symbol need to associate with a MCSectionXCOFF to
// get the correct storage mapping class. In this case, XCOFF::XMC_PR.
if (GO && GO->isDeclaration() && !S->hasContainingCsect()) {
// On AIX, an undefined symbol needs to be associated with a
// MCSectionXCOFF to get the correct storage mapping class.
// In this case, XCOFF::XMC_PR.
const XCOFF::StorageClass SC =
TargetLoweringObjectFileXCOFF::getStorageClassForGlobal(GO);
MCSectionXCOFF *Sec =
Context.getXCOFFSection(S->getName(), XCOFF::XMC_PR, XCOFF::XTY_ER,
XCOFF::C_EXT, SectionKind::getMetadata());
SC, SectionKind::getMetadata());
S->setContainingCsect(Sec);
}

30
test/CodeGen/PowerPC/aix-weak-undef-func-call.ll Normal file
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@ -0,0 +1,30 @@
; RUN: llc -mtriple powerpc-ibm-aix-xcoff -filetype=obj -o %t.o < %s
; RUN: llvm-readobj --symbols %t.o | FileCheck %s
define void @bar() {
entry:
call void bitcast (void (...)* @foo to void ()*)()
ret void
}
declare extern_weak void @foo(...)
;CHECK: Symbol {
;CHECK: Name: .foo
;CHECK-NEXT: Value (RelocatableAddress): 0x0
;CHECK-NEXT: Section: N_UNDEF
;CHECK-NEXT: Type: 0x0
;CHECK-NEXT: StorageClass: C_WEAKEXT (0x6F)
;CHECK-NEXT: NumberOfAuxEntries: 1
;CHECK-NEXT: CSECT Auxiliary Entry {
;CHECK: SectionLen: 0
;CHECK-NEXT: ParameterHashIndex: 0x0
;CHECK-NEXT: TypeChkSectNum: 0x0
;CHECK-NEXT: SymbolAlignmentLog2: 0
;CHECK-NEXT: SymbolType: XTY_ER (0x0)
;CHECK-NEXT: StorageMappingClass: XMC_PR (0x0)
;CHECK-NEXT: StabInfoIndex: 0x0
;CHECK-NEXT: StabSectNum: 0x0
;CHECK-NEXT: }
;CHECK-NEXT: }