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Debug info: split out complex DIVariable address expressions into a

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separate MDNode so they can be uniqued via folding set magic. To conserve
space, DIVariable nodes are still variable-length, with the last two
fields being optional.

No functional change.
http://reviews.llvm.org/D3526

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212050 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adrian Prantl 2014-06-30 17:17:35 +00:00
parent e6cfdc8471
commit 93b97c9a57
12 changed files with 61 additions and 32 deletions
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1
docs/SourceLevelDebugging.rst
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@ -570,6 +570,7 @@ Local variables
metadata, ;; Reference to the type descriptor
i32, ;; flags
metadata ;; (optional) Reference to inline location
metadata ;; (optional) Reference to a complex expression (see below)
}
These descriptors are used to define variables local to a sub program. The

13
include/llvm/IR/DebugInfo.h
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@ -690,12 +690,17 @@ public:
/// HasComplexAddr - Return true if the variable has a complex address.
bool hasComplexAddress() const { return getNumAddrElements() > 0; }
unsigned getNumAddrElements() const;
uint64_t getAddrElement(unsigned Idx) const {
return getUInt64Field(Idx + 8);
/// \brief Return the size of this variable's complex address or
/// zero if there is none.
unsigned getNumAddrElements() const {
if (DbgNode->getNumOperands() < 9)
return 0;
return getDescriptorField(8)->getNumOperands();
}
/// \brief return the Idx'th complex address element.
uint64_t getAddrElement(unsigned Idx) const;
/// isBlockByrefVariable - Return true if the variable was declared as
/// a "__block" variable (Apple Blocks).
bool isBlockByrefVariable(const DITypeIdentifierMap &Map) const {

25
lib/IR/DIBuilder.cpp
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@ -1075,18 +1075,19 @@ DIVariable DIBuilder::createComplexVariable(unsigned Tag, DIDescriptor Scope,
DITypeRef Ty,
ArrayRef<Value *> Addr,
unsigned ArgNo) {
SmallVector<Value *, 15> Elts;
Elts.push_back(GetTagConstant(VMContext, Tag));
Elts.push_back(getNonCompileUnitScope(Scope)),
Elts.push_back(MDString::get(VMContext, Name));
Elts.push_back(F);
Elts.push_back(ConstantInt::get(Type::getInt32Ty(VMContext),
(LineNo | (ArgNo << 24))));
Elts.push_back(Ty);
Elts.push_back(Constant::getNullValue(Type::getInt32Ty(VMContext)));
Elts.push_back(Constant::getNullValue(Type::getInt32Ty(VMContext)));
Elts.append(Addr.begin(), Addr.end());
assert(Addr.size() > 0 && "complex address is empty");
Value *Elts[] = {
GetTagConstant(VMContext, Tag),
getNonCompileUnitScope(Scope),
MDString::get(VMContext, Name),
F,
ConstantInt::get(Type::getInt32Ty(VMContext),
(LineNo | (ArgNo << 24))),
Ty,
Constant::getNullValue(Type::getInt32Ty(VMContext)),
Constant::getNullValue(Type::getInt32Ty(VMContext)),
MDNode::get(VMContext, Addr)
};
return DIVariable(MDNode::get(VMContext, Elts));
}

18
lib/IR/DebugInfo.cpp
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@ -138,8 +138,14 @@ void DIDescriptor::replaceFunctionField(unsigned Elt, Function *F) {
}
}
unsigned DIVariable::getNumAddrElements() const {
return DbgNode->getNumOperands() - 8;
uint64_t DIVariable::getAddrElement(unsigned Idx) const {
DIDescriptor ComplexExpr = getDescriptorField(8);
if (Idx < ComplexExpr->getNumOperands())
if (auto *CI = dyn_cast_or_null<ConstantInt>(ComplexExpr->getOperand(Idx)))
return CI->getZExtValue();
assert(false && "non-existing complex address element requested");
return 0;
}
/// getInlinedAt - If this variable is inlined then return inline location.
@ -566,7 +572,13 @@ bool DIVariable::Verify() const {
// Make sure that type @ field 5 is a DITypeRef.
if (!fieldIsTypeRef(DbgNode, 5))
return false;
return DbgNode->getNumOperands() >= 8;
// Variable without a complex expression.
if (DbgNode->getNumOperands() == 8)
return true;
// Make sure the complex expression is an MDNode.
return (DbgNode->getNumOperands() == 9 && fieldIsMDNode(DbgNode, 8));
}
/// Verify - Verify that a location descriptor is well formed.

9
test/CodeGen/ARM/debug-info-blocks.ll
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@ -231,10 +231,10 @@ define hidden void @foobar_func_block_invoke_0(i8* %.block_descriptor, %0* %load
!133 = metadata !{i32 609, i32 175, metadata !23, null}
!134 = metadata !{i32 786689, metadata !23, metadata !"data", metadata !24, i32 67109473, metadata !108, i32 0, null} ; [ DW_TAG_arg_variable ]
!135 = metadata !{i32 609, i32 190, metadata !23, null}
!136 = metadata !{i32 786688, metadata !23, metadata !"mydata", metadata !24, i32 604, metadata !50, i32 0, null, i64 1, i64 20, i64 2, i64 1, i64 4, i64 2, i64 1, i64 24} ; [ DW_TAG_auto_variable ]
!136 = metadata !{i32 786688, metadata !23, metadata !"mydata", metadata !24, i32 604, metadata !50, i32 0, null, metadata !163} ; [ DW_TAG_auto_variable ]
!137 = metadata !{i32 604, i32 49, metadata !23, null}
!138 = metadata !{i32 786688, metadata !23, metadata !"self", metadata !40, i32 604, metadata !90, i32 0, null, i64 1, i64 24} ; [ DW_TAG_auto_variable ]
!139 = metadata !{i32 786688, metadata !23, metadata !"semi", metadata !24, i32 607, metadata !125, i32 0, null, i64 1, i64 28} ; [ DW_TAG_auto_variable ]
!138 = metadata !{i32 786688, metadata !23, metadata !"self", metadata !40, i32 604, metadata !90, i32 0, null, metadata !164} ; [ DW_TAG_auto_variable ]
!139 = metadata !{i32 786688, metadata !23, metadata !"semi", metadata !24, i32 607, metadata !125, i32 0, null, metadata !165} ; [ DW_TAG_auto_variable ]
!140 = metadata !{i32 607, i32 30, metadata !23, null}
!141 = metadata !{i32 610, i32 17, metadata !142, null}
!142 = metadata !{i32 786443, metadata !152, metadata !23, i32 609, i32 200, i32 94} ; [ DW_TAG_lexical_block ]
@ -258,3 +258,6 @@ define hidden void @foobar_func_block_invoke_0(i8* %.block_descriptor, %0* %load
!160 = metadata !{metadata !"header.h", metadata !"/Volumes/Sandbox/llvm"}
!161 = metadata !{metadata !"header2.h", metadata !"/Volumes/Sandbox/llvm"}
!162 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
!163 = metadata !{i64 1, i64 20, i64 2, i64 1, i64 4, i64 2, i64 1, i64 24}
!164 = metadata !{i64 1, i64 24}
!165 = metadata !{i64 1, i64 28}

3
test/DebugInfo/X86/block-capture.ll
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@ -118,7 +118,7 @@ declare i32 @__objc_personality_v0(...)
!50 = metadata !{i32 786445, metadata !63, metadata !6, metadata !"block", i32 7, i64 64, i64 64, i64 256, i32 0, metadata !9} ; [ DW_TAG_member ]
!51 = metadata !{i32 7, i32 18, metadata !28, null}
!52 = metadata !{i32 7, i32 19, metadata !28, null}
!53 = metadata !{i32 786688, metadata !28, metadata !"block", metadata !6, i32 5, metadata !9, i32 0, i32 0, i64 1, i64 32} ; [ DW_TAG_auto_variable ]
!53 = metadata !{i32 786688, metadata !28, metadata !"block", metadata !6, i32 5, metadata !9, i32 0, i32 0, metadata !65} ; [ DW_TAG_auto_variable ]
!54 = metadata !{i32 5, i32 27, metadata !28, null}
!55 = metadata !{i32 8, i32 22, metadata !56, null}
!56 = metadata !{i32 786443, metadata !6, metadata !57, i32 7, i32 26, i32 2} ; [ DW_TAG_lexical_block ]
@ -130,3 +130,4 @@ declare i32 @__objc_personality_v0(...)
!62 = metadata !{i32 9, i32 20, metadata !56, null}
!63 = metadata !{metadata !"foo.m", metadata !"/Users/echristo"}
!64 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
!65 = metadata !{i64 1, i64 32}

3
test/DebugInfo/X86/dbg_value_direct.ll
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@ -170,8 +170,9 @@ attributes #2 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "n
!20 = metadata !{i32 786468}
!21 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
!22 = metadata !{i32 2, metadata !"Dwarf Version", i32 3}
!23 = metadata !{i32 786689, metadata !4, metadata !"", metadata !5, i32 16777222, metadata !21, i32 0, i32 0, i64 2} ; [ DW_TAG_arg_variable ] [line 6]
!23 = metadata !{i32 786689, metadata !4, metadata !"", metadata !5, i32 16777222, metadata !21, i32 0, i32 0, metadata !28} ; [ DW_TAG_arg_variable ] [line 6]
!24 = metadata !{i32 786688, metadata !4, metadata !"a", metadata !5, i32 7, metadata !8, i32 8192, i32 0} ; [ DW_TAG_auto_variable ] [a] [line 7]
!25 = metadata !{i32 7, i32 0, metadata !4, null}
!26 = metadata !{i32 8, i32 0, metadata !4, null} ; [ DW_TAG_imported_declaration ]
!27 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
!28 = metadata !{i64 2}

6
test/DebugInfo/X86/debug-info-block-captured-self.ll
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@ -101,10 +101,12 @@ define internal void @"__24-[Main initWithContext:]_block_invoke_2"(i8* %.block_
!41 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, null} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from ]
!42 = metadata !{i32 786478, metadata !1, metadata !1, metadata !"__24-[Main initWithContext:]_block_invoke_2", metadata !"__24-[Main initWithContext:]_block_invoke_2", metadata !"", i32 35, metadata !39, i1 true, i1 true, i32 0, i32 0, null, i32 256, i1 false, void (i8*, i8*)* @"__24-[Main initWithContext:]_block_invoke_2", null, null, metadata !15, i32 35} ; [ DW_TAG_subprogram ] [line 35] [local] [def] [__24-[Main initWithContext:]_block_invoke_2]
!84 = metadata !{i32 33, i32 0, metadata !38, null}
!86 = metadata !{i32 786688, metadata !38, metadata !"self", metadata !1, i32 41, metadata !34, i32 0, i32 0, i64 1, i64 32} ; [ DW_TAG_auto_variable ] [self] [line 41]
!86 = metadata !{i32 786688, metadata !38, metadata !"self", metadata !1, i32 41, metadata !34, i32 0, i32 0, metadata !110} ; [ DW_TAG_auto_variable ] [self] [line 41]
!87 = metadata !{i32 41, i32 0, metadata !38, null}
!103 = metadata !{i32 35, i32 0, metadata !42, null}
!105 = metadata !{i32 786688, metadata !42, metadata !"self", metadata !1, i32 40, metadata !34, i32 0, i32 0, i64 1, i64 32} ; [ DW_TAG_auto_variable ] [self] [line 40]
!105 = metadata !{i32 786688, metadata !42, metadata !"self", metadata !1, i32 40, metadata !34, i32 0, i32 0, metadata !109} ; [ DW_TAG_auto_variable ] [self] [line 40]
!106 = metadata !{i32 40, i32 0, metadata !42, null}
!107 = metadata !{metadata !"llvm/tools/clang/test/CodeGenObjC/debug-info-block-captured-self.m", metadata !""}
!108 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
!109 = metadata !{i64 1, i64 32}
!110 = metadata !{i64 1, i64 32}

3
test/DebugInfo/X86/debug-info-blocks.ll
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@ -359,7 +359,7 @@ attributes #3 = { nounwind }
!86 = metadata !{i32 786451, metadata !1, null, metadata !"__block_descriptor_withcopydispose", i32 49, i64 0, i64 0, i32 0, i32 4, null, null, i32 0, null, null, null} ; [ DW_TAG_structure_type ] [__block_descriptor_withcopydispose] [line 49, size 0, align 0, offset 0] [decl] [from ]
!87 = metadata !{i32 786445, metadata !5, metadata !6, metadata !"self", i32 49, i64 64, i64 64, i64 256, i32 0, metadata !61} ; [ DW_TAG_member ] [self] [line 49, size 64, align 64, offset 256] [from ]
!88 = metadata !{i32 49, i32 0, metadata !27, null}
!89 = metadata !{i32 786688, metadata !27, metadata !"self", metadata !32, i32 52, metadata !23, i32 0, i32 0, i64 2, i64 1, i64 32} ; [ DW_TAG_auto_variable ] [self] [line 52]
!89 = metadata !{i32 786688, metadata !27, metadata !"self", metadata !32, i32 52, metadata !23, i32 0, i32 0, metadata !111} ; [ DW_TAG_auto_variable ] [self] [line 52]
!90 = metadata !{i32 52, i32 0, metadata !27, null}
!91 = metadata !{i32 786688, metadata !92, metadata !"d", metadata !6, i32 50, metadata !93, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [d] [line 50]
!92 = metadata !{i32 786443, metadata !5, metadata !27, i32 49, i32 0, i32 2} ; [ DW_TAG_lexical_block ] [llvm/tools/clang/test/CodeGenObjC/debug-info-blocks.m]
@ -381,3 +381,4 @@ attributes #3 = { nounwind }
!108 = metadata !{i32 61, i32 0, metadata !36, null}
!109 = metadata !{i32 62, i32 0, metadata !36, null}
!110 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
!111 = metadata !{i64 2, i64 1, i64 32}

4
test/DebugInfo/X86/debug-loc-asan.ll
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@ -181,6 +181,6 @@ attributes #1 = { nounwind readnone }
!9 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
!10 = metadata !{i32 2, metadata !"Debug Info Version", i32 1}
!11 = metadata !{metadata !"clang version 3.5.0 (209308)"}
!12 = metadata !{i32 786689, metadata !4, metadata !"y", metadata !5, i32 16777217, metadata !8, i32 0, i32 0, i64 2} ; [ DW_TAG_arg_variable ] [y] [line 1]
!12 = metadata !{i32 786689, metadata !4, metadata !"y", metadata !5, i32 16777217, metadata !8, i32 0, i32 0, metadata !14} ; [ DW_TAG_arg_variable ] [y] [line 1]
!13 = metadata !{i32 2, i32 0, metadata !4, null}
!14 = metadata !{i64 2}

3
test/DebugInfo/X86/op_deref.ll
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@ -89,7 +89,7 @@ declare void @llvm.stackrestore(i8*) nounwind
!11 = metadata !{i32 1, i32 26, metadata !5, null}
!12 = metadata !{i32 3, i32 13, metadata !13, null}
!13 = metadata !{i32 786443, metadata !28, metadata !5, i32 2, i32 1, i32 0} ; [ DW_TAG_lexical_block ]
!14 = metadata !{i32 786688, metadata !13, metadata !"vla", metadata !6, i32 3, metadata !15, i32 8192, i32 0, i64 2} ; [ DW_TAG_auto_variable ]
!14 = metadata !{i32 786688, metadata !13, metadata !"vla", metadata !6, i32 3, metadata !15, i32 8192, i32 0, metadata !30} ; [ DW_TAG_auto_variable ]
!15 = metadata !{i32 786433, null, null, metadata !"", i32 0, i64 0, i64 32, i32 0, i32 0, metadata !9, metadata !16, i32 0, null, null, null} ; [ DW_TAG_array_type ] [line 0, size 0, align 32, offset 0] [from int]
!16 = metadata !{metadata !17}
!17 = metadata !{i32 786465, i64 0, i64 -1} ; [ DW_TAG_subrange_type ]
@ -105,3 +105,4 @@ declare void @llvm.stackrestore(i8*) nounwind
!27 = metadata !{i32 8, i32 1, metadata !13, null}
!28 = metadata !{metadata !"bar.c", metadata !"/Users/echristo/tmp"}
!29 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
!30 = metadata !{i64 2}

5
test/Instrumentation/AddressSanitizer/debug_info.ll
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@ -47,8 +47,9 @@ declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
; Verify that debug descriptors for argument and local variable will be replaced
; with descriptors that end with OpDeref (encoded as 2).
; CHECK: ![[ARG_ID]] = metadata {{.*}} i64 2} ; [ DW_TAG_arg_variable ] [p] [line 1]
; CHECK: ![[VAR_ID]] = metadata {{.*}} i64 2} ; [ DW_TAG_auto_variable ] [r] [line 2]
; CHECK: ![[ARG_ID]] = {{.*}}metadata ![[OPDEREF:[0-9]+]]} ; [ DW_TAG_arg_variable ] [p] [line 1]
; CHECK: ![[OPDEREF]] = metadata !{i64 2}
; CHECK: ![[VAR_ID]] = {{.*}}metadata ![[OPDEREF]]} ; [ DW_TAG_auto_variable ] [r] [line 2]
; Verify that there are no more variable descriptors.
; CHECK-NOT: DW_TAG_arg_variable
; CHECK-NOT: DW_TAG_auto_variable