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Fix PIC jump table codegen on x86-32/linux. In fact, such thing should be applied

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to all targets uses GOT-relative offsets for PIC (Alpha?)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44108 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2007-11-14 09:18:41 +00:00
parent 87b665d3de
commit 9de1934099
5 changed files with 81 additions and 32 deletions
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69
lib/CodeGen/AsmPrinter.cpp
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@@ -245,17 +245,9 @@ void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
MachineFunction &MF) {
const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
if (JT.empty()) return;
bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
// Use JumpTableDirective otherwise honor the entry size from the jump table
// info.
const char *JTEntryDirective = TAI->getJumpTableDirective();
bool HadJTEntryDirective = JTEntryDirective != NULL;
if (!HadJTEntryDirective) {
JTEntryDirective = MJTI->getEntrySize() == 4 ?
TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
}
// Pick the directive to use to print the jump table entries, and switch to
// the appropriate section.
TargetLowering *LoweringInfo = TM.getTargetLowering();
@@ -300,30 +292,51 @@ void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
<< '_' << i << ":\n";
for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
O << JTEntryDirective << ' ';
// If we have emitted set directives for the jump table entries, print
// them rather than the entries themselves. If we're emitting PIC, then
// emit the table entries as differences between two text section labels.
// If we're emitting non-PIC code, then emit the entries as direct
// references to the target basic blocks.
if (!EmittedSets.empty()) {
O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
<< '_' << i << "_set_" << JTBBs[ii]->getNumber();
} else if (IsPic) {
printBasicBlockLabel(JTBBs[ii], false, false);
// If the arch uses custom Jump Table directives, don't calc relative to
// JT
if (!HadJTEntryDirective)
O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
<< getFunctionNumber() << '_' << i;
} else {
printBasicBlockLabel(JTBBs[ii], false, false);
}
printPICJumpTableEntry(MJTI, JTBBs[ii], i);
O << '\n';
}
}
}
void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
const MachineBasicBlock *MBB,
unsigned uid) const {
bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
// Use JumpTableDirective otherwise honor the entry size from the jump table
// info.
const char *JTEntryDirective = TAI->getJumpTableDirective();
bool HadJTEntryDirective = JTEntryDirective != NULL;
if (!HadJTEntryDirective) {
JTEntryDirective = MJTI->getEntrySize() == 4 ?
TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
}
O << JTEntryDirective << ' ';
// If we have emitted set directives for the jump table entries, print
// them rather than the entries themselves. If we're emitting PIC, then
// emit the table entries as differences between two text section labels.
// If we're emitting non-PIC code, then emit the entries as direct
// references to the target basic blocks.
if (IsPic) {
if (TAI->getSetDirective()) {
O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
<< '_' << uid << "_set_" << MBB->getNumber();
} else {
printBasicBlockLabel(MBB, false, false);
// If the arch uses custom Jump Table directives, don't calc relative to
// JT
if (!HadJTEntryDirective)
O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
<< getFunctionNumber() << '_' << uid;
}
} else {
printBasicBlockLabel(MBB, false, false);
}
}
/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
/// special global used by LLVM. If so, emit it and return true, otherwise
/// do nothing and return false.