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add setJumpBufSize() and setJumpBufAlignment() to target-lowering.

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Call these from your backend to enjoy setjmp/longjmp goodness, see
lib/Target/IA64/IA64ISelLowering.cpp for an example


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30095 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duraid Madina
2006-09-04 06:21:35 +00:00
parent 362b3680c1
commit 2a0013f59f
5 changed files with 47 additions and 14 deletions
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20
lib/Transforms/Utils/LowerInvoke.cpp
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@ -45,6 +45,7 @@
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Target/TargetLowering.h"
#include <csetjmp>
using namespace llvm;
@ -67,9 +68,12 @@ namespace {
const Type *JBLinkTy;
GlobalVariable *JBListHead;
Function *SetJmpFn, *LongJmpFn;
// We peek in TLI to grab the target's jmp_buf size and alignment
const TargetLowering *TLI;
public:
LowerInvoke(unsigned Size = 200, unsigned Align = 0) : JumpBufSize(Size),
JumpBufAlign(Align) {}
LowerInvoke(const TargetLowering *tli = NULL) : TLI(tli) { }
bool doInitialization(Module &M);
bool runOnFunction(Function &F);
@ -89,9 +93,6 @@ namespace {
void rewriteExpensiveInvoke(InvokeInst *II, unsigned InvokeNo,
AllocaInst *InvokeNum, SwitchInst *CatchSwitch);
bool insertExpensiveEHSupport(Function &F);
unsigned JumpBufSize;
unsigned JumpBufAlign;
};
RegisterPass<LowerInvoke>
@ -101,9 +102,8 @@ namespace {
const PassInfo *llvm::LowerInvokePassID = X.getPassInfo();
// Public Interface To the LowerInvoke pass.
FunctionPass *llvm::createLowerInvokePass(unsigned JumpBufSize,
unsigned JumpBufAlign) {
return new LowerInvoke(JumpBufSize, JumpBufAlign);
FunctionPass *llvm::createLowerInvokePass(const TargetLowering *TLI) {
return new LowerInvoke(TLI);
}
// doInitialization - Make sure that there is a prototype for abort in the
@ -113,7 +113,7 @@ bool LowerInvoke::doInitialization(Module &M) {
AbortMessage = 0;
if (ExpensiveEHSupport) {
// Insert a type for the linked list of jump buffers.
const Type *JmpBufTy = ArrayType::get(VoidPtrTy, JumpBufSize);
const Type *JmpBufTy = ArrayType::get(VoidPtrTy, TLI->getJumpBufSize());
{ // The type is recursive, so use a type holder.
std::vector<const Type*> Elements;
@ -453,7 +453,7 @@ bool LowerInvoke::insertExpensiveEHSupport(Function &F) {
// that needs to be restored on all exits from the function. This is an
// alloca because the value needs to be live across invokes.
AllocaInst *JmpBuf =
new AllocaInst(JBLinkTy, 0, JumpBufAlign, "jblink", F.begin()->begin());
new AllocaInst(JBLinkTy, 0, TLI->getJumpBufAlignment(), "jblink", F.begin()->begin());
std::vector<Value*> Idx;
Idx.push_back(Constant::getNullValue(Type::IntTy));