6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-15 19:24:33 +00:00
Code Issues Projects Releases Wiki Activity

switch jump table entry emission to be based on EntryKind

Browse Source 
instead of magic variables.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94500 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-01-26 03:43:22 +00:00
parent b9768b0731
commit ff537cec2e
1 changed files with 39 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
View File

@@ -543,31 +543,54 @@ void AsmPrinter::EmitJumpTableInfo(MachineFunction &MF) {
void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI, void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
const MachineBasicBlock *MBB, const MachineBasicBlock *MBB,
unsigned uid) const { unsigned uid) const {
// If the target supports GPRel, use it. const MCExpr *Value = 0;
if (MAI->getGPRel32Directive() != 0) { switch (MJTI->getEntryKind()) {
case MachineJumpTableInfo::EK_BlockAddress:
// EK_BlockAddress - Each entry is a plain address of block, e.g.:
// .word LBB123
Value = MCSymbolRefExpr::Create(GetMBBSymbol(MBB->getNumber()), OutContext);
break;
case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
// EK_GPRel32BlockAddress - Each entry is an address of block, encoded
// with a relocation as gp-relative, e.g.:
// .gprel32 LBB123
MCSymbol *MBBSym = GetMBBSymbol(MBB->getNumber()); MCSymbol *MBBSym = GetMBBSymbol(MBB->getNumber());
OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext)); OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
return; return;
} }
// If we have emitted set directives for the jump table entries, print case MachineJumpTableInfo::EK_LabelDifference32: {
// them rather than the entries themselves. If we're emitting PIC, then // EK_LabelDifference32 - Each entry is the address of the block minus
// emit the table entries as differences between two text section labels. // the address of the jump table. This is used for PIC jump tables where
const MCExpr *Val; // gprel32 is not supported. e.g.:
if (MAI->getSetDirective()) { // .word LBB123 - LJTI1_2
// If we used .set, reference the .set's symbol. // If the .set directive is supported, this is emitted as:
Val = MCSymbolRefExpr::Create(GetJTSetSymbol(uid, MBB->getNumber()), // .set L4_5_set_123, LBB123 - LJTI1_2
OutContext); // .word L4_5_set_123
} else {
// 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 (MAI->getSetDirective()) {
// If we used .set, reference the .set's symbol.
Value = MCSymbolRefExpr::Create(GetJTSetSymbol(uid, MBB->getNumber()),
OutContext);
break;
}
// Otherwise, use the difference as the jump table entry. // Otherwise, use the difference as the jump table entry.
Val = MCSymbolRefExpr::Create(GetMBBSymbol(MBB->getNumber()), OutContext); Value = MCSymbolRefExpr::Create(GetMBBSymbol(MBB->getNumber()), OutContext);
const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(uid), OutContext); const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(uid), OutContext);
Val = MCBinaryExpr::CreateSub(Val, JTI, OutContext); Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
break;
}
} }
assert(Value && "Unknown entry kind!");
unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData()); unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
OutStreamer.EmitValue(Val, EntrySize, /*addrspace*/0); OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
} }