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Allow for fixed objects to reside in the local area, and if they don't to not

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clobber them by allocating other objects in the same space!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11454 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2004-02-15 00:14:20 +00:00
parent c81efdc59c
commit 05d8350c12
1 changed files with 13 additions and 6 deletions
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19
lib/CodeGen/PrologEpilogInserter.cpp
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@@ -24,8 +24,7 @@
#include "llvm/Target/MRegisterInfo.h" #include "llvm/Target/MRegisterInfo.h"
#include "llvm/Target/TargetFrameInfo.h" #include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetInstrInfo.h" #include "llvm/Target/TargetInstrInfo.h"
using namespace llvm;
namespace llvm {
namespace { namespace {
struct PEI : public MachineFunctionPass { struct PEI : public MachineFunctionPass {
@@ -72,7 +71,7 @@ namespace {
/// createPrologEpilogCodeInserter - This function returns a pass that inserts /// createPrologEpilogCodeInserter - This function returns a pass that inserts
/// prolog and epilog code, and eliminates abstract frame references. /// prolog and epilog code, and eliminates abstract frame references.
/// ///
FunctionPass *createPrologEpilogCodeInserter() { return new PEI(); } FunctionPass *llvm::createPrologEpilogCodeInserter() { return new PEI(); }
/// saveCallerSavedRegisters - Scan the function for modified caller saved /// saveCallerSavedRegisters - Scan the function for modified caller saved
@@ -203,8 +202,18 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
unsigned StackAlignment = TFI.getStackAlignment(); unsigned StackAlignment = TFI.getStackAlignment();
// Start at the beginning of the local area... // Start at the beginning of the local area.
int Offset = TFI.getOffsetOfLocalArea(); int Offset = TFI.getOffsetOfLocalArea();
// Check to see if there are any fixed sized objects that are preallocated in
// the local area. We currently don't support filling in holes in between
// fixed sized objects, so we just skip to the end of the last fixed sized
// preallocated object.
for (int i = FFI->getObjectIndexBegin(); i != 0; ++i) {
int FixedOff = -FFI->getObjectOffset(i);
if (FixedOff > Offset) Offset = FixedOff;
}
for (unsigned i = 0, e = FFI->getObjectIndexEnd(); i != e; ++i) { for (unsigned i = 0, e = FFI->getObjectIndexEnd(); i != e; ++i) {
Offset += FFI->getObjectSize(i); // Allocate Size bytes... Offset += FFI->getObjectSize(i); // Allocate Size bytes...
@@ -265,5 +274,3 @@ void PEI::replaceFrameIndices(MachineFunction &Fn) {
break; break;
} }
} }
} // End llvm namespace