diff options
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/AsmPrinter/AsmPrinter.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp index 257b963f9b..55e620e109 100644 --- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp +++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp @@ -1642,9 +1642,15 @@ MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const { /// MachineBasicBlock, an alignment (if present) and a comment describing /// it if appropriate. void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const { + // Emit an alignment directive for this block, if needed. if (unsigned Align = MBB->getAlignment()) EmitAlignment(Log2_32(Align)); + // If the block has its address taken, emit a special label to satisfy + // references to the block. This is done so that we don't need to + // remember the number of this label, and so that we can make + // forward references to labels without knowing what their numbers + // will be. if (MBB->hasAddressTaken()) { GetBlockAddressSymbol(MBB->getBasicBlock()->getParent(), MBB->getBasicBlock())->print(O, MAI); @@ -1656,6 +1662,7 @@ void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const { O << '\n'; } + // Print the main label for the block. if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) { if (VerboseAsm) O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':'; @@ -1666,6 +1673,7 @@ void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const { O << '\n'; } + // Print some comments to accompany the label. if (VerboseAsm) { if (const BasicBlock *BB = MBB->getBasicBlock()) if (BB->hasName()) { |