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Add a isImmutable bit to StackObject. Fixed stack objects are immutable (in the function) unless specified otherwise.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45812 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-01-10 02:18:37 +00:00
parent 038129dd58
commit 0d0e1b58cb
1 changed files with 18 additions and 5 deletions
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23
include/llvm/CodeGen/MachineFrameInfo.h
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@ -86,8 +86,13 @@ class MachineFrameInfo {
// the function. This field has no meaning for a variable sized element. // the function. This field has no meaning for a variable sized element.
int64_t SPOffset; int64_t SPOffset;
StackObject(uint64_t Sz, unsigned Al, int64_t SP) // isImmutable - If true, the value of the stack object does not change
: Size(Sz), Alignment(Al), SPOffset(SP) {} // 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... /// Objects - The list of stack objects allocated...
@ -255,11 +260,13 @@ public:
/// CreateFixedObject - Create a new object at a fixed location on the stack. /// CreateFixedObject - Create a new object at a fixed location on the stack.
/// All fixed objects should be created before other objects are created for /// 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!"); 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; return -++NumFixedObjects;
} }
@ -269,6 +276,12 @@ public:
return ObjectIdx < 0 && (ObjectIdx >= -(int)NumFixedObjects); 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 /// CreateStackObject - Create a new statically sized stack object, returning
/// a postive identifier to represent it. /// a postive identifier to represent it.
/// ///