JumpTable support! What this represents is working asm and jit support for
x86 and ppc for 100% dense switch statements when relocations are non-PIC.
This support will be extended and enhanced in the coming days to support
PIC, and less dense forms of jump tables.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27947 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCAsmPrinter.cpp b/lib/Target/PowerPC/PPCAsmPrinter.cpp
index b34bf9a..11c0ec0 100644
--- a/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ b/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -233,6 +233,8 @@
printOperand(MI, OpNo+1);
}
+ virtual void printBasicBlockLabel(const MachineBasicBlock *MBB) const;
+
virtual bool runOnMachineFunction(MachineFunction &F) = 0;
virtual bool doFinalization(Module &M) = 0;
@@ -277,6 +279,8 @@
Data64bitsDirective = 0; // we can't emit a 64-bit unit
AlignmentIsInBytes = false; // Alignment is by power of 2.
ConstantPoolSection = "\t.const\t";
+ // FIXME: Conditionalize jump table section based on PIC
+ JumpTableSection = ".const";
LCOMMDirective = "\t.lcomm\t";
StaticCtorsSection = ".mod_init_func";
StaticDtorsSection = ".mod_term_func";
@@ -373,13 +377,14 @@
abort();
return;
- case MachineOperand::MO_MachineBasicBlock: {
- MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
- O << PrivateGlobalPrefix << "BB" << getFunctionNumber() << "_"
- << MBBOp->getNumber() << "\t; " << MBBOp->getBasicBlock()->getName();
+ case MachineOperand::MO_MachineBasicBlock:
+ printBasicBlockLabel(MO.getMachineBasicBlock());
return;
- }
-
+ case MachineOperand::MO_JumpTableIndex:
+ O << PrivateGlobalPrefix << "JTI" << getFunctionNumber()
+ << '_' << MO.getJumpTableIndex();
+ // FIXME: PIC relocation model
+ return;
case MachineOperand::MO_ConstantPoolIndex:
O << PrivateGlobalPrefix << "CPI" << getFunctionNumber()
<< '_' << MO.getConstantPoolIndex();
@@ -500,6 +505,11 @@
return;
}
+void PPCAsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB) const {
+ O << PrivateGlobalPrefix << "BB" << getFunctionNumber() << "_"
+ << MBB->getNumber() << '\t' << CommentString
+ << MBB->getBasicBlock()->getName();
+}
/// runOnMachineFunction - This uses the printMachineInstruction()
/// method to print assembly for each instruction.
@@ -514,6 +524,9 @@
// Print out constants referenced by the function
EmitConstantPool(MF.getConstantPool());
+ // Print out jump tables referenced by the function
+ EmitJumpTableInfo(MF.getJumpTableInfo());
+
// Print out labels for the function.
const Function *F = MF.getFunction();
switch (F->getLinkage()) {