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Improve llvm.dbg.declare intrinsic by referring directly to the storage in its first argument, via function-local metadata (instead of via a bitcast). 

This patch also cleans up code that expects there to be a bitcast in the first argument and testcases that call llvm.dbg.declare.

llvm-svn: 93504
This commit is contained in:
Victor Hernandez 2010-01-15 03:37:48 +00:00
parent dec5a39ea5
commit 5d6551816b
9 changed files with 49 additions and 55 deletions
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3
llvm/include/llvm/Analysis/DebugInfo.h
View File

@ -491,7 +491,6 @@ namespace llvm {
Module &M;
LLVMContext& VMContext;
const Type *EmptyStructPtr; // "{}*".
Function *DeclareFn; // llvm.dbg.declare
Function *ValueFn; // llvm.dbg.value
@ -659,7 +658,7 @@ namespace llvm {
/// Finds the dbg.declare intrinsic corresponding to this value if any.
/// It looks through pointer casts too.
const DbgDeclareInst *findDbgDeclare(const Value *V, bool stripCasts = true);
const DbgDeclareInst *findDbgDeclare(const Value *V);
/// Find the debug info descriptor corresponding to this global variable.
Value *findDbgGlobalDeclare(GlobalVariable *V);

8
llvm/include/llvm/IntrinsicInst.h
View File

@ -25,6 +25,7 @@
#define LLVM_INTRINSICINST_H
#include "llvm/Constants.h"
#include "llvm/Metadata.h"
#include "llvm/Function.h"
#include "llvm/Instructions.h"
#include "llvm/Intrinsics.h"
@ -82,7 +83,12 @@ namespace llvm {
///
class DbgDeclareInst : public DbgInfoIntrinsic {
public:
Value *getAddress() const { return getOperand(1); }
Value *getAddress() const {
if (MDNode* MD = dyn_cast<MDNode>(getOperand(1)))
return MD->getOperand(0);
else
return NULL;
}
MDNode *getVariable() const { return cast<MDNode>(getOperand(2)); }
// Methods for support type inquiry through isa, cast, and dyn_cast:

2
llvm/include/llvm/Intrinsics.td
View File

@ -283,7 +283,7 @@ let Properties = [IntrNoMem] in {
// places.
let Properties = [IntrNoMem] in {
def int_dbg_declare : Intrinsic<[llvm_void_ty],
[llvm_descriptor_ty, llvm_metadata_ty]>;
[llvm_metadata_ty, llvm_metadata_ty]>;
def int_dbg_value : Intrinsic<[llvm_void_ty],
[llvm_metadata_ty, llvm_i64_ty,
llvm_metadata_ty]>;

51
llvm/lib/Analysis/DebugInfo.cpp
View File

@ -599,9 +599,7 @@ void DIVariable::dump() const {
//===----------------------------------------------------------------------===//
DIFactory::DIFactory(Module &m)
: M(m), VMContext(M.getContext()), DeclareFn(0) {
EmptyStructPtr = PointerType::getUnqual(StructType::get(VMContext));
}
: M(m), VMContext(M.getContext()), DeclareFn(0) {}
Constant *DIFactory::GetTagConstant(unsigned TAG) {
assert((TAG & LLVMDebugVersionMask) == 0 &&
@ -1034,26 +1032,22 @@ DILocation DIFactory::CreateLocation(unsigned LineNo, unsigned ColumnNo,
/// InsertDeclare - Insert a new llvm.dbg.declare intrinsic call.
Instruction *DIFactory::InsertDeclare(Value *Storage, DIVariable D,
Instruction *InsertBefore) {
// Cast the storage to a {}* for the call to llvm.dbg.declare.
Storage = new BitCastInst(Storage, EmptyStructPtr, "", InsertBefore);
if (!DeclareFn)
DeclareFn = Intrinsic::getDeclaration(&M, Intrinsic::dbg_declare);
Value *Args[] = { Storage, D.getNode() };
Value *Elts[] = { Storage };
Value *Args[] = { MDNode::get(Storage->getContext(), Elts, 1), D.getNode() };
return CallInst::Create(DeclareFn, Args, Args+2, "", InsertBefore);
}
/// InsertDeclare - Insert a new llvm.dbg.declare intrinsic call.
Instruction *DIFactory::InsertDeclare(Value *Storage, DIVariable D,
BasicBlock *InsertAtEnd) {
// Cast the storage to a {}* for the call to llvm.dbg.declare.
Storage = new BitCastInst(Storage, EmptyStructPtr, "", InsertAtEnd);
if (!DeclareFn)
DeclareFn = Intrinsic::getDeclaration(&M, Intrinsic::dbg_declare);
Value *Args[] = { Storage, D.getNode() };
Value *Elts[] = { Storage };
Value *Args[] = { MDNode::get(Storage->getContext(), Elts, 1), D.getNode() };
return CallInst::Create(DeclareFn, Args, Args+2, "", InsertAtEnd);
}
@ -1258,25 +1252,24 @@ Value *llvm::findDbgGlobalDeclare(GlobalVariable *V) {
/// Finds the llvm.dbg.declare intrinsic corresponding to this value if any.
/// It looks through pointer casts too.
const DbgDeclareInst *llvm::findDbgDeclare(const Value *V, bool stripCasts) {
if (stripCasts) {
V = V->stripPointerCasts();
// Look for the bitcast.
for (Value::use_const_iterator I = V->use_begin(), E =V->use_end();
I != E; ++I)
if (isa<BitCastInst>(I)) {
const DbgDeclareInst *DDI = findDbgDeclare(*I, false);
if (DDI) return DDI;
}
const DbgDeclareInst *llvm::findDbgDeclare(const Value *V) {
V = V->stripPointerCasts();
if (!isa<Instruction>(V) && !isa<Argument>(V))
return 0;
}
// Find llvm.dbg.declare among uses of the instruction.
for (Value::use_const_iterator I = V->use_begin(), E =V->use_end();
I != E; ++I)
if (const DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(I))
return DDI;
const Function *F = NULL;
if (const Instruction *I = dyn_cast<Instruction>(V))
F = I->getParent()->getParent();
else if (const Argument *A = dyn_cast<Argument>(V))
F = A->getParent();
for (Function::const_iterator FI = F->begin(), FE = F->end(); FI != FE; ++FI)
for (BasicBlock::const_iterator BI = (*FI).begin(), BE = (*FI).end();
BI != BE; ++BI)
if (const DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(BI))
if (DDI->getAddress() == V)
return DDI;
return 0;
}

2
llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
View File

@ -332,8 +332,6 @@ bool FastISel::SelectCall(User *I) {
return true;
Value *Address = DI->getAddress();
if (BitCastInst *BCI = dyn_cast<BitCastInst>(Address))
Address = BCI->getOperand(0);
AllocaInst *AI = dyn_cast<AllocaInst>(Address);
// Don't handle byval struct arguments or VLAs, for example.
if (!AI) break;

7
llvm/lib/VMCore/Verifier.cpp
View File

@ -1590,9 +1590,10 @@ void Verifier::visitIntrinsicFunctionCall(Intrinsic::ID ID, CallInst &CI) {
default:
break;
case Intrinsic::dbg_declare: // llvm.dbg.declare
if (Constant *C = dyn_cast<Constant>(CI.getOperand(1)))
Assert1(C && !isa<ConstantPointerNull>(C),
"invalid llvm.dbg.declare intrinsic call", &CI);
if (MDNode *MD = dyn_cast<MDNode>(CI.getOperand(1)))
if (Constant *C = dyn_cast<Constant>(MD->getOperand(0)))
Assert1(C && !isa<ConstantPointerNull>(C),
"invalid llvm.dbg.declare intrinsic call", &CI);
break;
case Intrinsic::memcpy:
case Intrinsic::memmove:

20
llvm/test/Assembler/functionlocal-metadata.ll
View File

@ -5,23 +5,21 @@ entry:
%0 = add i32 %a, 1 ; <i32> [#uses=1]
%two = add i32 %b, %0 ; <i32> [#uses=0]
%1 = alloca i32 ; <i32*> [#uses=1]
%three = bitcast i32* %1 to { }* ; <{ }*> [#uses=6]
call void @llvm.dbg.declare({ }* %three, metadata !{i32* %1})
; CHECK: metadata !{i32* %1}
call void @llvm.dbg.declare({ }* %three, metadata !{{ }* %three})
call void @llvm.dbg.declare({ }* %three, metadata !{i32 %0})
call void @llvm.dbg.declare({ }* %three, metadata !{{ }* %three, i32 %0})
call void @llvm.dbg.declare({ }* %three, metadata !{i32 %b, i32 %0})
call void @llvm.dbg.declare({ }* %three, metadata !{i32 %a, metadata !"foo"})
call void @llvm.dbg.declare(metadata !{i32* %1}, metadata !{i32* %1})
; CHECK: metadata !{i32* %1}, metadata !{i32* %1}
call void @llvm.dbg.declare(metadata !{i32 %two}, metadata !{i32 %0})
call void @llvm.dbg.declare(metadata !{i32 %0}, metadata !{i32* %1, i32 %0})
call void @llvm.dbg.declare(metadata !{i32* %1}, metadata !{i32 %b, i32 %0})
call void @llvm.dbg.declare(metadata !{i32 %a}, metadata !{i32 %a, metadata !"foo"})
; CHECK: metadata !{i32 %a, metadata !"foo"}
call void @llvm.dbg.declare({ }* %three, metadata !{metadata !0, i32 %two})
call void @llvm.dbg.declare(metadata !{i32 %b}, metadata !{metadata !0, i32 %two})
call void @llvm.dbg.value(metadata !{ i32 %a }, i64 0, metadata !1)
call void @llvm.dbg.value(metadata !{ i32 %0 }, i64 25, metadata !0)
call void @llvm.dbg.value(metadata !{ i32* %1 }, i64 16, metadata !"foo")
; CHECK: call void @llvm.dbg.value(metadata !{i32* %1}, i64 16, metadata !"foo")
call void @llvm.dbg.value(metadata !{ { }* %three }, i64 12, metadata !"bar")
call void @llvm.dbg.value(metadata !"foo", i64 12, metadata !"bar")
ret void, !foo !0, !bar !1
; CHECK: ret void, !foo !0, !bar !1
@ -30,7 +28,7 @@ entry:
!0 = metadata !{i32 662302, i32 26, metadata !1, null}
!1 = metadata !{i32 4, metadata !"foo"}
declare void @llvm.dbg.declare({ }*, metadata) nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
declare void @llvm.dbg.value(metadata, i64, metadata) nounwind readnone
!foo = !{ !0 }

5
llvm/test/DebugInfo/2009-10-16-Scope.ll
View File

@ -9,8 +9,7 @@ entry:
br label %do.body, !dbg !0
do.body: ; preds = %entry
%0 = bitcast i32* %count_ to { }* ; <{ }*> [#uses=1]
call void @llvm.dbg.declare({ }* %0, metadata !4)
call void @llvm.dbg.declare(metadata !{i32* %count_}, metadata !4)
%conv = ptrtoint i32* %count_ to i32, !dbg !0 ; <i32> [#uses=1]
%call = call i32 @foo(i32 %conv) ssp, !dbg !0 ; <i32> [#uses=0]
br label %do.end, !dbg !0
@ -19,7 +18,7 @@ do.end: ; preds = %do.body
ret void, !dbg !7
}
declare void @llvm.dbg.declare({ }*, metadata) nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
declare i32 @foo(i32) ssp

6
llvm/test/DebugInfo/printdbginfo2.ll
View File

@ -19,11 +19,11 @@ entry:
call void @llvm.dbg.stoppoint(i32 6, i32 3, metadata !1)
call void @llvm.dbg.stoppoint(i32 7, i32 3, metadata !1)
%0 = bitcast %struct.foo* %b to { }* ; <{ }*> [#uses=1]
call void @llvm.dbg.declare({ }* %0, metadata !4)
call void @llvm.dbg.declare(metadata !{%struct.foo* %b}, metadata !4)
; CHECK:; %0 is variable b of type foo declared at x.c:7
call void @llvm.dbg.stoppoint(i32 8, i32 3, metadata !1)
%1 = bitcast [4 x i32]* %a to { }* ; <{ }*> [#uses=1]
call void @llvm.dbg.declare({ }* %1, metadata !8)
call void @llvm.dbg.declare(metadata !{[4 x i32]* %a}, metadata !8)
; CHECK:; %1 is variable a of type declared at x.c:8
call void @llvm.dbg.stoppoint(i32 9, i32 3, metadata !1)
%tmp = getelementptr inbounds %struct.foo* %b, i32 0, i32 0 ; <i32*> [#uses=1]
@ -46,7 +46,7 @@ declare void @llvm.dbg.func.start(metadata) nounwind readnone
declare void @llvm.dbg.stoppoint(i32, i32, metadata) nounwind readnone
declare void @llvm.dbg.declare({ }*, metadata) nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
declare void @llvm.dbg.region.end(metadata) nounwind readnone