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In mem2reg, for all alloca/stores that get promoted where the alloca has an associated llvm.dbg.declare instrinsic, insert an llvm.dbg.var intrinsic before each store

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94260 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Victor Hernandez 2010-01-23 00:17:34 +00:00
parent 12e555c36c
commit b6aebc2f46
2 changed files with 69 additions and 3 deletions
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41
lib/Transforms/Utils/PromoteMemoryToRegister.cpp
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@ -23,6 +23,7 @@
#include "llvm/Function.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Analysis/DebugInfo.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/AliasSetTracker.h"
#include "llvm/ADT/DenseMap.h"
@ -163,6 +164,7 @@ namespace {
std::vector<AllocaInst*> Allocas;
DominatorTree &DT;
DominanceFrontier &DF;
DIFactory *DIF;
/// AST - An AliasSetTracker object to update. If null, don't update it.
///
@ -199,7 +201,7 @@ namespace {
public:
PromoteMem2Reg(const std::vector<AllocaInst*> &A, DominatorTree &dt,
DominanceFrontier &df, AliasSetTracker *ast)
: Allocas(A), DT(dt), DF(df), AST(ast) {}
: Allocas(A), DT(dt), DF(df), DIF(0), AST(ast) {}
void run();
@ -241,8 +243,9 @@ namespace {
LargeBlockInfo &LBI);
void PromoteSingleBlockAlloca(AllocaInst *AI, AllocaInfo &Info,
LargeBlockInfo &LBI);
void ConvertDebugDeclareToDebugValue(DbgDeclareInst *DDI, StoreInst* SI,
uint64_t Offset);
void RenamePass(BasicBlock *BB, BasicBlock *Pred,
RenamePassData::ValVector &IncVals,
std::vector<RenamePassData> &Worklist);
@ -306,6 +309,19 @@ namespace {
} // end of anonymous namespace
/// Finds the llvm.dbg.declare intrinsic corresponding to an alloca if any.
static DbgDeclareInst *findDbgDeclare(AllocaInst *AI) {
Function *F = AI->getParent()->getParent();
for (Function::iterator FI = F->begin(), FE = F->end(); FI != FE; ++FI)
for (BasicBlock::iterator BI = (*FI).begin(), BE = (*FI).end();
BI != BE; ++BI)
if (DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(BI))
if (DDI->getAddress() == AI)
return DDI;
return 0;
}
void PromoteMem2Reg::run() {
Function &F = *DF.getRoot()->getParent();
@ -344,6 +360,8 @@ void PromoteMem2Reg::run() {
// Finally, after the scan, check to see if the store is all that is left.
if (Info.UsingBlocks.empty()) {
// Record debuginfo for the store before removing it.
ConvertDebugDeclareToDebugValue(findDbgDeclare(AI), Info.OnlyStore, 0);
// Remove the (now dead) store and alloca.
Info.OnlyStore->eraseFromParent();
LBI.deleteValue(Info.OnlyStore);
@ -370,8 +388,11 @@ void PromoteMem2Reg::run() {
if (Info.UsingBlocks.empty()) {
// Remove the (now dead) stores and alloca.
DbgDeclareInst *DDI = findDbgDeclare(AI);
while (!AI->use_empty()) {
StoreInst *SI = cast<StoreInst>(AI->use_back());
// Record debuginfo for the store before removing it.
ConvertDebugDeclareToDebugValue(DDI, SI, 0);
SI->eraseFromParent();
LBI.deleteValue(SI);
}
@ -833,6 +854,18 @@ void PromoteMem2Reg::PromoteSingleBlockAlloca(AllocaInst *AI, AllocaInfo &Info,
}
}
// Inserts a llvm.dbg.value instrinsic before the stores to an alloca'd value
// that has an associated llvm.dbg.decl intrinsic.
void PromoteMem2Reg::ConvertDebugDeclareToDebugValue(DbgDeclareInst *DDI,
StoreInst* SI,
uint64_t Offset) {
if (!DDI) return;
if (!DIF)
DIF = new DIFactory(*SI->getParent()->getParent()->getParent());
DIF->InsertDbgValueIntrinsic(SI->getOperand(0), Offset,
DIVariable(DDI->getVariable()), SI);
}
// QueuePhiNode - queues a phi-node to be added to a basic-block for a specific
// Alloca returns true if there wasn't already a phi-node for that variable
@ -946,6 +979,8 @@ NextIteration:
// what value were we writing?
IncomingVals[ai->second] = SI->getOperand(0);
// Record debuginfo for the store before removing it.
ConvertDebugDeclareToDebugValue(findDbgDeclare(Dest), SI, 0);
BB->getInstList().erase(SI);
}
}

31
test/Transforms/Mem2Reg/ConvertDebugInfo.ll Normal file
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@ -0,0 +1,31 @@
; RUN: opt < %s -mem2reg -S | FileCheck %s
target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
define double @testfunc(i32 %i, double %j) {
%I = alloca i32 ; <i32*> [#uses=4]
call void @llvm.dbg.declare(metadata !{i32* %I}, metadata !0)
%J = alloca double ; <double*> [#uses=2]
call void @llvm.dbg.declare(metadata !{double* %J}, metadata !1)
; CHECK: call void @llvm.dbg.value(metadata !{i32 %i}, i64 0, metadata !0)
store i32 %i, i32* %I
; CHECK: call void @llvm.dbg.value(metadata !{double %j}, i64 0, metadata !1)
store double %j, double* %J
%t1 = load i32* %I ; <i32> [#uses=1]
%t2 = add i32 %t1, 1 ; <i32> [#uses=1]
store i32 %t2, i32* %I
%t3 = load i32* %I ; <i32> [#uses=1]
%t4 = sitofp i32 %t3 to double ; <double> [#uses=1]
%t5 = load double* %J ; <double> [#uses=1]
%t6 = fmul double %t4, %t5 ; <double> [#uses=1]
ret double %t6
}
declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
!bar = !{!0}
!foo = !{!2}
!0 = metadata !{i32 459008, metadata !1, metadata !"foo", metadata !2, i32 5, metadata !"foo"} ; [ DW_TAG_auto_variable ]
!1 = metadata !{i32 459008, metadata !1, metadata !"foo", metadata !0, i32 5, metadata !1} ; [ DW_TAG_auto_variable ]
!2 = metadata !{i32 458804, i32 0, metadata !2, metadata !"foo", metadata !"bar", metadata !"bar", metadata !2, i32 3, metadata !0, i1 false, i1 true} ; [ DW_TAG_variable ]