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author | Reid Kleckner <reid@kleckner.net> | 2014-06-20 20:35:47 +0000 |
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committer | Reid Kleckner <reid@kleckner.net> | 2014-06-20 20:35:47 +0000 |
commit | 5b8e73ef81bdbc3ce4d020f66d875e22827b7626 (patch) | |
tree | 81e26866c3184143e4adec8bd26d003dc644245b /lib/CodeGen/MachineFunction.cpp | |
parent | 20dead8d0ce64f70e1dcf558f69b6d725ba18d9d (diff) | |
download | llvm-5b8e73ef81bdbc3ce4d020f66d875e22827b7626.tar.gz llvm-5b8e73ef81bdbc3ce4d020f66d875e22827b7626.tar.bz2 llvm-5b8e73ef81bdbc3ce4d020f66d875e22827b7626.tar.xz |
Generate native unwind info on Win64
This patch enables LLVM to emit Win64-native unwind info rather than
DWARF CFI. It handles all corner cases (I hope), including stack
realignment.
Because the unwind info is not flexible enough to describe stack frames
with a gap of unknown size in the middle, such as the one caused by
stack realignment, I modified register spilling code to place all spills
into the fixed frame slots, so that they can be accessed relative to the
frame pointer.
Patch by Vadim Chugunov!
Reviewed By: rnk
Differential Revision: http://reviews.llvm.org/D4081
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211399 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineFunction.cpp')
-rw-r--r-- | lib/CodeGen/MachineFunction.cpp | 45 |
1 files changed, 28 insertions, 17 deletions
diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp index eb3d71fef5..6138aef4ad 100644 --- a/lib/CodeGen/MachineFunction.cpp +++ b/lib/CodeGen/MachineFunction.cpp @@ -457,7 +457,7 @@ unsigned MachineFunction::addLiveIn(unsigned PReg, /// getJTISymbol - Return the MCSymbol for the specified non-empty jump table. /// If isLinkerPrivate is specified, an 'l' label is returned, otherwise a /// normal 'L' label is returned. -MCSymbol *MachineFunction::getJTISymbol(unsigned JTI, MCContext &Ctx, +MCSymbol *MachineFunction::getJTISymbol(unsigned JTI, MCContext &Ctx, bool isLinkerPrivate) const { const DataLayout *DL = getTarget().getDataLayout(); assert(JumpTableInfo && "No jump tables"); @@ -530,10 +530,9 @@ int MachineFrameInfo::CreateStackObject(uint64_t Size, unsigned Alignment, /// int MachineFrameInfo::CreateSpillStackObject(uint64_t Size, unsigned Alignment) { - Alignment = - clampStackAlignment(!getFrameLowering()->isStackRealignable() || - !RealignOption, - Alignment, getFrameLowering()->getStackAlignment()); + Alignment = clampStackAlignment( + !getFrameLowering()->isStackRealignable() || !RealignOption, Alignment, + getFrameLowering()->getStackAlignment()); CreateStackObject(Size, Alignment, true); int Index = (int)Objects.size() - NumFixedObjects - 1; ensureMaxAlignment(Alignment); @@ -548,10 +547,9 @@ int MachineFrameInfo::CreateSpillStackObject(uint64_t Size, int MachineFrameInfo::CreateVariableSizedObject(unsigned Alignment, const AllocaInst *Alloca) { HasVarSizedObjects = true; - Alignment = - clampStackAlignment(!getFrameLowering()->isStackRealignable() || - !RealignOption, - Alignment, getFrameLowering()->getStackAlignment()); + Alignment = clampStackAlignment( + !getFrameLowering()->isStackRealignable() || !RealignOption, Alignment, + getFrameLowering()->getStackAlignment()); Objects.push_back(StackObject(0, Alignment, 0, false, false, Alloca)); ensureMaxAlignment(Alignment); return (int)Objects.size()-NumFixedObjects-1; @@ -571,16 +569,30 @@ int MachineFrameInfo::CreateFixedObject(uint64_t Size, int64_t SPOffset, // object is 16-byte aligned. unsigned StackAlign = getFrameLowering()->getStackAlignment(); unsigned Align = MinAlign(SPOffset, StackAlign); - Align = - clampStackAlignment(!getFrameLowering()->isStackRealignable() || - !RealignOption, - Align, getFrameLowering()->getStackAlignment()); + Align = clampStackAlignment(!getFrameLowering()->isStackRealignable() || + !RealignOption, + Align, getFrameLowering()->getStackAlignment()); Objects.insert(Objects.begin(), StackObject(Size, Align, SPOffset, Immutable, /*isSS*/ false, /*Alloca*/ nullptr)); return -++NumFixedObjects; } +/// CreateFixedSpillStackObject - Create a spill slot at a fixed location +/// on the stack. Returns an index with a negative value. +int MachineFrameInfo::CreateFixedSpillStackObject(uint64_t Size, + int64_t SPOffset) { + unsigned StackAlign = getFrameLowering()->getStackAlignment(); + unsigned Align = MinAlign(SPOffset, StackAlign); + Align = clampStackAlignment(!getFrameLowering()->isStackRealignable() || + !RealignOption, + Align, getFrameLowering()->getStackAlignment()); + Objects.insert(Objects.begin(), StackObject(Size, Align, SPOffset, + /*Immutable*/ true, + /*isSS*/ true, + /*Alloca*/ nullptr)); + return -++NumFixedObjects; +} BitVector MachineFrameInfo::getPristineRegs(const MachineBasicBlock *MBB) const { @@ -849,11 +861,10 @@ static bool CanShareConstantPoolEntry(const Constant *A, const Constant *B, if (isa<StructType>(A->getType()) || isa<ArrayType>(A->getType()) || isa<StructType>(B->getType()) || isa<ArrayType>(B->getType())) return false; - + // For now, only support constants with the same size. uint64_t StoreSize = TD->getTypeStoreSize(A->getType()); - if (StoreSize != TD->getTypeStoreSize(B->getType()) || - StoreSize > 128) + if (StoreSize != TD->getTypeStoreSize(B->getType()) || StoreSize > 128) return false; Type *IntTy = IntegerType::get(A->getContext(), StoreSize*8); @@ -882,7 +893,7 @@ static bool CanShareConstantPoolEntry(const Constant *A, const Constant *B, /// an existing one. User must specify the log2 of the minimum required /// alignment for the object. /// -unsigned MachineConstantPool::getConstantPoolIndex(const Constant *C, +unsigned MachineConstantPool::getConstantPoolIndex(const Constant *C, unsigned Alignment) { assert(Alignment && "Alignment must be specified!"); if (Alignment > PoolAlignment) PoolAlignment = Alignment; |