[llvm-commits] [llvm] r45812 - /llvm/trunk/include/llvm/CodeGen/MachineFrameInfo.h
Evan Cheng
evan.cheng at apple.com
Wed Jan 9 18:18:37 PST 2008
Author: evancheng
Date: Wed Jan 9 20:18:37 2008
New Revision: 45812
URL: http://llvm.org/viewvc/llvm-project?rev=45812&view=rev
Log:
Add a isImmutable bit to StackObject. Fixed stack objects are immutable (in the function) unless specified otherwise.
Modified:
llvm/trunk/include/llvm/CodeGen/MachineFrameInfo.h
Modified: llvm/trunk/include/llvm/CodeGen/MachineFrameInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/MachineFrameInfo.h?rev=45812&r1=45811&r2=45812&view=diff
==============================================================================
--- llvm/trunk/include/llvm/CodeGen/MachineFrameInfo.h (original)
+++ llvm/trunk/include/llvm/CodeGen/MachineFrameInfo.h Wed Jan 9 20:18:37 2008
@@ -86,8 +86,13 @@
// the function. This field has no meaning for a variable sized element.
int64_t SPOffset;
- StackObject(uint64_t Sz, unsigned Al, int64_t SP)
- : Size(Sz), Alignment(Al), SPOffset(SP) {}
+ // isImmutable - If true, the value of the stack object does not change
+ // in this function. By default, fixed objects are immutable unless marked
+ // otherwise.
+ bool isImmutable;
+
+ StackObject(uint64_t Sz, unsigned Al, int64_t SP, bool IM = false)
+ : Size(Sz), Alignment(Al), SPOffset(SP), isImmutable(IM) {}
};
/// Objects - The list of stack objects allocated...
@@ -255,11 +260,13 @@
/// CreateFixedObject - Create a new object at a fixed location on the stack.
/// All fixed objects should be created before other objects are created for
- /// efficiency. This returns an index with a negative value.
+ /// efficiency. By default, fixed objects are immutable. This returns an
+ /// index with a negative value.
///
- int CreateFixedObject(uint64_t Size, int64_t SPOffset) {
+ int CreateFixedObject(uint64_t Size, int64_t SPOffset,
+ bool Immutable = true) {
assert(Size != 0 && "Cannot allocate zero size fixed stack objects!");
- Objects.insert(Objects.begin(), StackObject(Size, 1, SPOffset));
+ Objects.insert(Objects.begin(), StackObject(Size, 1, SPOffset, Immutable));
return -++NumFixedObjects;
}
@@ -269,6 +276,12 @@
return ObjectIdx < 0 && (ObjectIdx >= -(int)NumFixedObjects);
}
+ /// isImmutableObjectIndex - Returns true if the specified index corresponds
+ /// to an immutable object.
+ bool isImmutableObjectIndex(int ObjectIdx) const {
+ return Objects[ObjectIdx+NumFixedObjects].isImmutable;
+ }
+
/// CreateStackObject - Create a new statically sized stack object, returning
/// a postive identifier to represent it.
///
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