diff options
Diffstat (limited to 'contrib/llvm/lib/CodeGen/PrologEpilogInserter.cpp')
| -rw-r--r-- | contrib/llvm/lib/CodeGen/PrologEpilogInserter.cpp | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/contrib/llvm/lib/CodeGen/PrologEpilogInserter.cpp b/contrib/llvm/lib/CodeGen/PrologEpilogInserter.cpp index a901c5f..32c9325 100644 --- a/contrib/llvm/lib/CodeGen/PrologEpilogInserter.cpp +++ b/contrib/llvm/lib/CodeGen/PrologEpilogInserter.cpp @@ -29,6 +29,7 @@ #include "llvm/CodeGen/MachineRegisterInfo.h" #include "llvm/CodeGen/RegisterScavenging.h" #include "llvm/Target/TargetMachine.h" +#include "llvm/Target/TargetOptions.h" #include "llvm/Target/TargetRegisterInfo.h" #include "llvm/Target/TargetFrameLowering.h" #include "llvm/Target/TargetInstrInfo.h" @@ -54,6 +55,8 @@ INITIALIZE_PASS_END(PEI, "prologepilog", STATISTIC(NumVirtualFrameRegs, "Number of virtual frame regs encountered"); STATISTIC(NumScavengedRegs, "Number of frame index regs scavenged"); +STATISTIC(NumBytesStackSpace, + "Number of bytes used for stack in all functions"); /// createPrologEpilogCodeInserter - This function returns a pass that inserts /// prolog and epilog code, and eliminates abstract frame references. @@ -677,7 +680,9 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) { } // Update frame info to pretend that this is part of the stack... - MFI->setStackSize(Offset - LocalAreaOffset); + int64_t StackSize = Offset - LocalAreaOffset; + MFI->setStackSize(StackSize); + NumBytesStackSpace += StackSize; } /// insertPrologEpilogCode - Scan the function for modified callee saved @@ -696,6 +701,13 @@ void PEI::insertPrologEpilogCode(MachineFunction &Fn) { if (!I->empty() && I->back().getDesc().isReturn()) TFI.emitEpilogue(Fn, *I); } + + // Emit additional code that is required to support segmented stacks, if + // we've been asked for it. This, when linked with a runtime with support + // for segmented stacks (libgcc is one), will result in allocating stack + // space in small chunks instead of one large contiguous block. + if (EnableSegmentedStacks) + TFI.adjustForSegmentedStacks(Fn); } /// replaceFrameIndices - Replace all MO_FrameIndex operands with physical |
