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Handle (delete) dbg intrinsics while promoting alloca.
llvm-svn: 58826
This commit is contained in:
Devang Patel
parent
89da8440e1
commit
0958cd6437
@ -22,6 +22,7 @@
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#include "llvm/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "llvm/Instructions.h"
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#include "llvm/IntrinsicInst.h"
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#include "llvm/Analysis/Dominators.h"
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#include "llvm/Analysis/AliasSetTracker.h"
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#include "llvm/ADT/DenseMap.h"
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@ -79,7 +80,18 @@ bool llvm::isAllocaPromotable(const AllocaInst *AI) {
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if (SI->isVolatile())
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return false;
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} else {
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return false; // Not a load or store.
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const BitCastInst *BC = dyn_cast<BitCastInst>(*UI);
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if (!BC)
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return false; // Not a load or store or dbg intrinsic.
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Value::use_const_iterator BCUI = BC->use_begin(), BCUE = BC->use_end();
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if (BCUI == BCUE)
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return false; // Not a dbg intrinsic.
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const DbgInfoIntrinsic *DI = dyn_cast<DbgInfoIntrinsic>(*BCUI);
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if (!DI)
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return false; // Not a dbg intrinsic.
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BCUI++;
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if (BCUI != BCUE)
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return false; // Not a dbg intrinsic use.
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}
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return true;
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@ -275,14 +287,21 @@ namespace {
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/// ivars.
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void AnalyzeAlloca(AllocaInst *AI) {
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clear();
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// As we scan the uses of the alloca instruction, keep track of stores,
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// and decide whether all of the loads and stores to the alloca are within
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// the same basic block.
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for (Value::use_iterator U = AI->use_begin(), E = AI->use_end();
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U != E; ++U) {
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Instruction *User = cast<Instruction>(*U);
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if (StoreInst *SI = dyn_cast<StoreInst>(User)) {
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if (BitCastInst *BC = dyn_cast<BitCastInst>(User)) {
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// Remove dbg intrinsic uses now.
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Value::use_iterator BCUI = BC->use_begin();
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DbgInfoIntrinsic *DI = cast<DbgInfoIntrinsic>(*BCUI);
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assert (BCUI + 1 == BC->use_end() && "Unexpected alloca uses!");
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DI->eraseFromParent();
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BC->eraseFromParent();
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} else if (StoreInst *SI = dyn_cast<StoreInst>(User)) {
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// Remember the basic blocks which define new values for the alloca
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DefiningBlocks.push_back(SI->getParent());
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AllocaPointerVal = SI->getOperand(0);
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56
test/DebugInfo/2008-11-06-Mem2Reg.ll
Normal file
56
test/DebugInfo/2008-11-06-Mem2Reg.ll
Normal file
@ -0,0 +1,56 @@
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; RUN: llvm-as < %s | opt -mem2reg | llvm-dis | grep alloca | count 1
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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target triple = "i386-apple-darwin9.5"
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%llvm.dbg.anchor.type = type { i32, i32 }
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%llvm.dbg.basictype.type = type { i32, { }*, i8*, { }*, i32, i64, i64, i64, i32, i32 }
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%llvm.dbg.compile_unit.type = type { i32, { }*, i32, i8*, i8*, i8* }
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%llvm.dbg.subprogram.type = type { i32, { }*, { }*, i8*, i8*, i8*, { }*, i32, { }*, i1, i1 }
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%llvm.dbg.variable.type = type { i32, { }*, i8*, { }*, i32, { }* }
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@llvm.dbg.subprogram = internal constant %llvm.dbg.subprogram.type { i32 393262, { }* bitcast (%llvm.dbg.anchor.type* @llvm.dbg.subprograms to { }*), { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*), i8* getelementptr ([4 x i8]* @.str3, i32 0, i32 0), i8* getelementptr ([4 x i8]* @.str3, i32 0, i32 0), i8* null, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*), i32 2, { }* bitcast (%llvm.dbg.basictype.type* @llvm.dbg.basictype to { }*), i1 false, i1 true }, section "llvm.metadata" ; <%llvm.dbg.subprogram.type*> [#uses=1]
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@llvm.dbg.subprograms = linkonce constant %llvm.dbg.anchor.type { i32 393216, i32 46 }, section "llvm.metadata" ; <%llvm.dbg.anchor.type*> [#uses=1]
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@llvm.dbg.compile_unit = internal constant %llvm.dbg.compile_unit.type { i32 393233, { }* bitcast (%llvm.dbg.anchor.type* @llvm.dbg.compile_units to { }*), i32 1, i8* getelementptr ([7 x i8]* @.str, i32 0, i32 0), i8* getelementptr ([6 x i8]* @.str1, i32 0, i32 0), i8* getelementptr ([55 x i8]* @.str2, i32 0, i32 0) }, section "llvm.metadata" ; <%llvm.dbg.compile_unit.type*> [#uses=1]
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@llvm.dbg.compile_units = linkonce constant %llvm.dbg.anchor.type { i32 393216, i32 17 }, section "llvm.metadata" ; <%llvm.dbg.anchor.type*> [#uses=1]
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@.str = internal constant [7 x i8] c"adce.c\00", section "llvm.metadata" ; <[7 x i8]*> [#uses=1]
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@.str1 = internal constant [6 x i8] c"/tmp/\00", section "llvm.metadata" ; <[6 x i8]*> [#uses=1]
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@.str2 = internal constant [55 x i8] c"4.2.1 (Based on Apple Inc. build 5623) (LLVM build 00)\00", section "llvm.metadata" ; <[55 x i8]*> [#uses=1]
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@.str3 = internal constant [4 x i8] c"foo\00", section "llvm.metadata" ; <[4 x i8]*> [#uses=1]
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@llvm.dbg.basictype = internal constant %llvm.dbg.basictype.type { i32 393252, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*), i8* getelementptr ([4 x i8]* @.str4, i32 0, i32 0), { }* null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5 }, section "llvm.metadata" ; <%llvm.dbg.basictype.type*> [#uses=1]
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@.str4 = internal constant [4 x i8] c"int\00", section "llvm.metadata" ; <[4 x i8]*> [#uses=1]
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@llvm.dbg.variable = internal constant %llvm.dbg.variable.type { i32 393472, { }* bitcast (%llvm.dbg.subprogram.type* @llvm.dbg.subprogram to { }*), i8* getelementptr ([2 x i8]* @.str5, i32 0, i32 0), { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*), i32 3, { }* bitcast (%llvm.dbg.basictype.type* @llvm.dbg.basictype to { }*) }, section "llvm.metadata" ; <%llvm.dbg.variable.type*> [#uses=1]
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@.str5 = internal constant [2 x i8] c"i\00", section "llvm.metadata" ; <[2 x i8]*> [#uses=1]
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define i32 @foo() nounwind {
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entry:
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%retval = alloca i32 ; <i32*> [#uses=2]
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%i = alloca i32 ; <i32*> [#uses=4]
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%0 = alloca i32 ; <i32*> [#uses=2]
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%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
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call void @llvm.dbg.func.start({ }* bitcast (%llvm.dbg.subprogram.type* @llvm.dbg.subprogram to { }*))
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%i1 = bitcast i32* %i to { }* ; <{ }*> [#uses=1]
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call void @llvm.dbg.declare({ }* %i1, { }* bitcast (%llvm.dbg.variable.type* @llvm.dbg.variable to { }*))
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call void @llvm.dbg.stoppoint(i32 3, i32 0, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*))
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store i32 4, i32* %i, align 4
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call void @llvm.dbg.stoppoint(i32 4, i32 0, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*))
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%1 = load i32* %i, align 4 ; <i32> [#uses=1]
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%2 = mul i32 %1, 84 ; <i32> [#uses=1]
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store i32 %2, i32* %i, align 4
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call void @llvm.dbg.stoppoint(i32 5, i32 0, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*))
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store i32 42, i32* %0, align 4
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%3 = load i32* %0, align 4 ; <i32> [#uses=1]
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store i32 %3, i32* %retval, align 4
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br label %return
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return: ; preds = %entry
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%retval2 = load i32* %retval ; <i32> [#uses=1]
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call void @llvm.dbg.stoppoint(i32 5, i32 0, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*))
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call void @llvm.dbg.region.end({ }* bitcast (%llvm.dbg.subprogram.type* @llvm.dbg.subprogram to { }*))
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ret i32 %retval2
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}
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declare void @llvm.dbg.func.start({ }*) nounwind
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declare void @llvm.dbg.declare({ }*, { }*) nounwind
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declare void @llvm.dbg.stoppoint(i32, i32, { }*) nounwind
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declare void @llvm.dbg.region.end({ }*) nounwind
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