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Add a new jump table encoding to indicate jump tables entries

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are inside the function by the target at the point of use.

llvm-svn: 98255
This commit is contained in:
Richard Osborne 2010-03-11 14:58:16 +00:00
parent 4ef6d8fa15
commit 9c71a0a5ba
4 changed files with 16 additions and 1 deletions
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6
include/llvm/CodeGen/MachineJumpTableInfo.h
View File

@ -61,7 +61,11 @@ public:
/// .set L4_5_set_123, LBB123 - LJTI1_2
/// .word L4_5_set_123
EK_LabelDifference32,
/// EK_Inline - Jump table entries are emitted inline at their point of
/// use. It is the responsibility of the target to emit the entries.
EK_Inline,
/// EK_Custom32 - Each entry is a 32-bit value that is custom lowered by the
/// TargetLowering::LowerCustomJumpTableEntry hook.
EK_Custom32

3
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
View File

@ -651,6 +651,7 @@ void AsmPrinter::EmitConstantPool() {
void AsmPrinter::EmitJumpTableInfo() {
const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
if (MJTI == 0) return;
if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
if (JT.empty()) return;
@ -727,6 +728,8 @@ void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
unsigned UID) const {
const MCExpr *Value = 0;
switch (MJTI->getEntryKind()) {
case MachineJumpTableInfo::EK_Inline:
llvm_unreachable("Cannot emit EK_Inline jump table entry"); break;
case MachineJumpTableInfo::EK_Custom32:
Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
OutContext);

4
lib/CodeGen/MachineFunction.cpp
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@ -574,6 +574,8 @@ unsigned MachineJumpTableInfo::getEntrySize(const TargetData &TD) const {
case MachineJumpTableInfo::EK_LabelDifference32:
case MachineJumpTableInfo::EK_Custom32:
return 4;
case MachineJumpTableInfo::EK_Inline:
return 0;
}
assert(0 && "Unknown jump table encoding!");
return ~0;
@ -591,6 +593,8 @@ unsigned MachineJumpTableInfo::getEntryAlignment(const TargetData &TD) const {
case MachineJumpTableInfo::EK_LabelDifference32:
case MachineJumpTableInfo::EK_Custom32:
return TD.getABIIntegerTypeAlignment(32);
case MachineJumpTableInfo::EK_Inline:
return 1;
}
assert(0 && "Unknown jump table encoding!");
return ~0;

4
lib/ExecutionEngine/JIT/JITEmitter.cpp
View File

@ -1393,6 +1393,8 @@ void JITEmitter::emitConstantPool(MachineConstantPool *MCP) {
void JITEmitter::initJumpTableInfo(MachineJumpTableInfo *MJTI) {
if (TheJIT->getJITInfo().hasCustomJumpTables())
return;
if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline)
return;
const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
if (JT.empty()) return;
@ -1420,6 +1422,8 @@ void JITEmitter::emitJumpTableInfo(MachineJumpTableInfo *MJTI) {
switch (MJTI->getEntryKind()) {
case MachineJumpTableInfo::EK_Inline:
return;
case MachineJumpTableInfo::EK_BlockAddress: {
// EK_BlockAddress - Each entry is a plain address of block, e.g.:
// .word LBB123