// The MachineJumpTableInfo class keeps track of jump tables referenced by
// lowered switch instructions in the MachineFunction.
//
-// Instructions reference the address of these jump tables through the use of
-// MO_JumpTableIndex values. When emitting assembly or machine code, these
-// virtual address references are converted to refer to the address of the
+// Instructions reference the address of these jump tables through the use of
+// MO_JumpTableIndex values. When emitting assembly or machine code, these
+// virtual address references are converted to refer to the address of the
// function jump tables.
//
//===----------------------------------------------------------------------===//
struct MachineJumpTableEntry {
/// MBBs - The vector of basic blocks from which to create the jump table.
std::vector<MachineBasicBlock*> MBBs;
-
+
explicit MachineJumpTableEntry(const std::vector<MachineBasicBlock*> &M)
: MBBs(M) {}
};
-
+
class MachineJumpTableInfo {
public:
/// JTEntryKind - This enum indicates how each entry of the jump table is
/// EK_BlockAddress - Each entry is a plain address of block, e.g.:
/// .word LBB123
EK_BlockAddress,
-
+
+ /// EK_GPRel64BlockAddress - Each entry is an address of block, encoded
+ /// with a relocation as gp-relative, e.g.:
+ /// .gpdword LBB123
+ EK_GPRel64BlockAddress,
+
/// EK_GPRel32BlockAddress - Each entry is an address of block, encoded
/// with a relocation as gp-relative, e.g.:
/// .gprel32 LBB123
EK_GPRel32BlockAddress,
-
+
/// EK_LabelDifference32 - Each entry is the address of the block minus
/// the address of the jump table. This is used for PIC jump tables where
/// gprel32 is not supported. e.g.:
std::vector<MachineJumpTableEntry> JumpTables;
public:
explicit MachineJumpTableInfo(JTEntryKind Kind): EntryKind(Kind) {}
-
+
JTEntryKind getEntryKind() const { return EntryKind; }
/// getEntrySize - Return the size of each entry in the jump table.
unsigned getEntrySize(const TargetData &TD) const;
/// getEntryAlignment - Return the alignment of each entry in the jump table.
unsigned getEntryAlignment(const TargetData &TD) const;
-
+
/// createJumpTableIndex - Create a new jump table.
///
unsigned createJumpTableIndex(const std::vector<MachineBasicBlock*> &DestBBs);
-
+
/// isEmpty - Return true if there are no jump tables.
///
bool isEmpty() const { return JumpTables.empty(); }
void RemoveJumpTable(unsigned Idx) {
JumpTables[Idx].MBBs.clear();
}
-
+
/// ReplaceMBBInJumpTables - If Old is the target of any jump tables, update
/// the jump tables to branch to New instead.
bool ReplaceMBBInJumpTables(MachineBasicBlock *Old, MachineBasicBlock *New);