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Add a new wrapper node for a DILexicalBlock that encapsulates it and a

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file. Since it should only be used when necessary propagate it through
the backend code generation and tweak testcases accordingly.

This helps with code like in clang's test/CodeGen/debug-info-line.c where
we have multiple #line directives within a single lexical block and want
to generate only a single block that contains each file change.

Part of rdar://10246360

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141729 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher 2011-10-11 22:59:11 +00:00
parent 5ba7b501fd
commit 6618a241f7
10 changed files with 115 additions and 10 deletions
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15
docs/SourceLevelDebugging.html
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@ -472,10 +472,23 @@ global variables are collected by named metadata <tt>!llvm.dbg.gv</tt>.</p>
</pre>
</div>
<p>These descriptors provide debug information about nested blocks within a
<p>This descriptor provides debug information about nested blocks within a
subprogram. The line number and column numbers are used to dinstinguish
two lexical blocks at same depth. </p>
<div class="doc_code">
<pre>
!3 = metadata !{
i32, ;; Tag = 11 + <a href="#LLVMDebugVersion">LLVMDebugVersion</a> (DW_TAG_lexical_block)
metadata ;; Reference to the scope we're annotating with a file change
metadata,;; Reference to the file the scope is enclosed in.
}
</pre>
</div>
<p>This descriptor provides a wrapper around a lexical scope to handle file
changes in the middle of a lexical block.</p>
</div>
<!-- ======================================================================= -->

9
include/llvm/Analysis/DIBuilder.h
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@ -37,6 +37,7 @@ namespace llvm {
class DINameSpace;
class DIVariable;
class DISubrange;
class DILexicalBlockFile;
class DILexicalBlock;
class DISubprogram;
class DITemplateTypeParameter;
@ -463,6 +464,14 @@ namespace llvm {
DIFile File, unsigned LineNo);
/// createLexicalBlockFile - This creates a descriptor for a lexical
/// block with a new file attached. This merely extends the existing
/// lexical block as it crosses a file.
/// @param Scope Lexical block.
/// @param File Source file.
DILexicalBlockFile createLexicalBlockFile(DIDescriptor Scope,
DIFile File);
/// createLexicalBlock - This creates a descriptor for a lexical block
/// with the specified parent context.
/// @param Scope Parent lexical scope.

23
include/llvm/Analysis/DebugInfo.h
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@ -40,6 +40,7 @@ namespace llvm {
class DIFile;
class DISubprogram;
class DILexicalBlock;
class DILexicalBlockFile;
class DIVariable;
class DIType;
@ -84,6 +85,7 @@ namespace llvm {
explicit DIDescriptor(const MDNode *N) : DbgNode(N) {}
explicit DIDescriptor(const DIFile F);
explicit DIDescriptor(const DISubprogram F);
explicit DIDescriptor(const DILexicalBlockFile F);
explicit DIDescriptor(const DILexicalBlock F);
explicit DIDescriptor(const DIVariable F);
explicit DIDescriptor(const DIType F);
@ -117,6 +119,7 @@ namespace llvm {
bool isFile() const;
bool isCompileUnit() const;
bool isNameSpace() const;
bool isLexicalBlockFile() const;
bool isLexicalBlock() const;
bool isSubrange() const;
bool isEnumerator() const;
@ -699,6 +702,26 @@ namespace llvm {
}
};
/// DILexicalBlockFile - This is a wrapper for a lexical block with
/// a filename change.
class DILexicalBlockFile : public DIScope {
public:
explicit DILexicalBlockFile(const MDNode *N = 0) : DIScope(N) {}
DIScope getContext() const { return getScope().getFieldAs<DIScope>(1); }
unsigned getLineNumber() const { return getScope().getUnsignedField(2); }
unsigned getColumnNumber() const { return getScope().getUnsignedField(3); }
StringRef getDirectory() const {
StringRef dir = getFieldAs<DIFile>(2).getDirectory();
return !dir.empty() ? dir : getContext().getDirectory();
}
StringRef getFilename() const {
StringRef filename = getFieldAs<DIFile>(2).getFilename();
assert(!filename.empty() && "Why'd you create this then?");
return filename;
}
DILexicalBlock getScope() const { return getFieldAs<DILexicalBlock>(1); }
};
/// DINameSpace - A wrapper for a C++ style name space.
class DINameSpace : public DIScope {
public:

12
lib/Analysis/DIBuilder.cpp
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@ -851,6 +851,18 @@ DINameSpace DIBuilder::createNameSpace(DIDescriptor Scope, StringRef Name,
return DINameSpace(MDNode::get(VMContext, Elts));
}
/// createLexicalBlockFile - This creates a new MDNode that encapsulates
/// an existing scope with a new filename.
DILexicalBlockFile DIBuilder::createLexicalBlockFile(DIDescriptor Scope,
DIFile File) {
Value *Elts[] = {
GetTagConstant(VMContext, dwarf::DW_TAG_lexical_block),
Scope,
File
};
return DILexicalBlockFile(MDNode::get(VMContext, Elts));
}
DILexicalBlock DIBuilder::createLexicalBlock(DIDescriptor Scope, DIFile File,
unsigned Line, unsigned Col) {
// Defeat MDNode uniqing for lexical blocks by using unique id.

32
lib/Analysis/DebugInfo.cpp
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@ -39,6 +39,9 @@ DIDescriptor::DIDescriptor(const DIFile F) : DbgNode(F.DbgNode) {
DIDescriptor::DIDescriptor(const DISubprogram F) : DbgNode(F.DbgNode) {
}
DIDescriptor::DIDescriptor(const DILexicalBlockFile F) : DbgNode(F.DbgNode) {
}
DIDescriptor::DIDescriptor(const DILexicalBlock F) : DbgNode(F.DbgNode) {
}
@ -263,9 +266,17 @@ bool DIDescriptor::isNameSpace() const {
return DbgNode && getTag() == dwarf::DW_TAG_namespace;
}
/// isLexicalBlockFile - Return true if the specified descriptor is a
/// lexical block with an extra file.
bool DIDescriptor::isLexicalBlockFile() const {
return DbgNode && getTag() == dwarf::DW_TAG_lexical_block &&
(DbgNode->getNumOperands() == 3);
}
/// isLexicalBlock - Return true if the specified tag is DW_TAG_lexical_block.
bool DIDescriptor::isLexicalBlock() const {
return DbgNode && getTag() == dwarf::DW_TAG_lexical_block;
return DbgNode && getTag() == dwarf::DW_TAG_lexical_block &&
(DbgNode->getNumOperands() > 3);
}
/// isSubrange - Return true if the specified tag is DW_TAG_subrange_type.
@ -540,6 +551,8 @@ DIArray DISubprogram::getVariables() const {
StringRef DIScope::getFilename() const {
if (!DbgNode)
return StringRef();
if (isLexicalBlockFile())
return DILexicalBlockFile(DbgNode).getFilename();
if (isLexicalBlock())
return DILexicalBlock(DbgNode).getFilename();
if (isSubprogram())
@ -559,6 +572,8 @@ StringRef DIScope::getFilename() const {
StringRef DIScope::getDirectory() const {
if (!DbgNode)
return StringRef();
if (isLexicalBlockFile())
return DILexicalBlockFile(DbgNode).getDirectory();
if (isLexicalBlock())
return DILexicalBlock(DbgNode).getDirectory();
if (isSubprogram())
@ -934,6 +949,10 @@ void DebugInfoFinder::processModule(Module &M) {
addCompileUnit(DICompileUnit(Scope));
else if (Scope.isSubprogram())
processSubprogram(DISubprogram(Scope));
else if (Scope.isLexicalBlockFile()) {
DILexicalBlockFile DBF = DILexicalBlockFile(Scope);
processLexicalBlock(DILexicalBlock(DBF.getScope()));
}
else if (Scope.isLexicalBlock())
processLexicalBlock(DILexicalBlock(Scope));
@ -967,6 +986,10 @@ void DebugInfoFinder::processLocation(DILocation Loc) {
processSubprogram(DISubprogram(S));
else if (S.isLexicalBlock())
processLexicalBlock(DILexicalBlock(S));
else if (S.isLexicalBlockFile()) {
DILexicalBlockFile DBF = DILexicalBlockFile(S);
processLexicalBlock(DILexicalBlock(DBF.getScope()));
}
processLocation(Loc.getOrigLocation());
}
@ -998,6 +1021,10 @@ void DebugInfoFinder::processLexicalBlock(DILexicalBlock LB) {
DIScope Context = LB.getContext();
if (Context.isLexicalBlock())
return processLexicalBlock(DILexicalBlock(Context));
else if (Context.isLexicalBlockFile()) {
DILexicalBlockFile DBF = DILexicalBlockFile(Context);
return processLexicalBlock(DILexicalBlock(DBF.getScope()));
}
else
return processSubprogram(DISubprogram(Context));
}
@ -1081,6 +1108,9 @@ DISubprogram llvm::getDISubprogram(const MDNode *Scope) {
if (D.isSubprogram())
return DISubprogram(Scope);
if (D.isLexicalBlockFile())
return getDISubprogram(DILexicalBlockFile(Scope).getContext());
if (D.isLexicalBlock())
return getDISubprogram(DILexicalBlock(Scope).getContext());

4
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -1371,6 +1371,10 @@ void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
DISubprogram SP(S);
Fn = SP.getFilename();
Dir = SP.getDirectory();
} else if (Scope.isLexicalBlockFile()) {
DILexicalBlockFile DBF(S);
Fn = DBF.getFilename();
Dir = DBF.getDirectory();
} else if (Scope.isLexicalBlock()) {
DILexicalBlock DB(S);
Fn = DB.getFilename();

20
lib/CodeGen/LexicalScopes.cpp
View File

@ -118,9 +118,16 @@ LexicalScope *LexicalScopes::findLexicalScope(DebugLoc DL) {
MDNode *IA = NULL;
DL.getScopeAndInlinedAt(Scope, IA, MF->getFunction()->getContext());
if (!Scope) return NULL;
// The scope that we were created with could have an extra file - which
// isn't what we care about in this case.
DIDescriptor D = DIDescriptor(Scope);
if (D.isLexicalBlockFile())
Scope = DILexicalBlockFile(Scope).getScope();
if (IA)
return InlinedLexicalScopeMap.lookup(DebugLoc::getFromDILocation(IA));
return LexicalScopeMap.lookup(DL.getScope(Scope->getContext()));
return LexicalScopeMap.lookup(Scope);
}
/// getOrCreateLexicalScope - Find lexical scope for the given DebugLoc. If
@ -129,6 +136,7 @@ LexicalScope *LexicalScopes::getOrCreateLexicalScope(DebugLoc DL) {
MDNode *Scope = NULL;
MDNode *InlinedAt = NULL;
DL.getScopeAndInlinedAt(Scope, InlinedAt, MF->getFunction()->getContext());
if (InlinedAt) {
// Create an abstract scope for inlined function.
getOrCreateAbstractScope(Scope);
@ -141,12 +149,16 @@ LexicalScope *LexicalScopes::getOrCreateLexicalScope(DebugLoc DL) {
/// getOrCreateRegularScope - Find or create a regular lexical scope.
LexicalScope *LexicalScopes::getOrCreateRegularScope(MDNode *Scope) {
DIDescriptor D = DIDescriptor(Scope);
if (D.isLexicalBlockFile())
Scope = DILexicalBlockFile(Scope).getScope();
LexicalScope *WScope = LexicalScopeMap.lookup(Scope);
if (WScope)
return WScope;
LexicalScope *Parent = NULL;
if (DIDescriptor(Scope).isLexicalBlock())
if (D.isLexicalBlock())
Parent = getOrCreateLexicalScope(DebugLoc::getFromDILexicalBlock(Scope));
WScope = new LexicalScope(Parent, DIDescriptor(Scope), NULL, false);
LexicalScopeMap.insert(std::make_pair(Scope, WScope));
@ -176,12 +188,14 @@ LexicalScope *LexicalScopes::getOrCreateInlinedScope(MDNode *Scope,
LexicalScope *LexicalScopes::getOrCreateAbstractScope(const MDNode *N) {
assert(N && "Invalid Scope encoding!");
DIDescriptor Scope(N);
if (Scope.isLexicalBlockFile())
Scope = DILexicalBlockFile(Scope).getScope();
LexicalScope *AScope = AbstractScopeMap.lookup(N);
if (AScope)
return AScope;
LexicalScope *Parent = NULL;
DIDescriptor Scope(N);
if (Scope.isLexicalBlock()) {
DILexicalBlock DB(N);
DIDescriptor ParentDesc = DB.getContext();

4
test/CodeGen/ARM/2009-10-16-Scope.ll
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@ -23,10 +23,10 @@ declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
declare i32 @foo(i32) ssp
!0 = metadata !{i32 5, i32 2, metadata !1, null}
!1 = metadata !{i32 458763, metadata !2}; [DW_TAG_lexical_block ]
!1 = metadata !{i32 458763, metadata !2, i32 1, i32 1}; [DW_TAG_lexical_block ]
!2 = metadata !{i32 458798, i32 0, metadata !3, metadata !"bar", metadata !"bar", metadata !"bar", metadata !3, i32 4, null, i1 false, i1 true}; [DW_TAG_subprogram ]
!3 = metadata !{i32 458769, i32 0, i32 12, metadata !"genmodes.i", metadata !"/Users/yash/Downloads", metadata !"clang 1.1", i1 true, i1 false, metadata !"", i32 0}; [DW_TAG_compile_unit ]
!4 = metadata !{i32 459008, metadata !5, metadata !"count_", metadata !3, i32 5, metadata !6}; [ DW_TAG_auto_variable ]
!5 = metadata !{i32 458763, metadata !1}; [DW_TAG_lexical_block ]
!5 = metadata !{i32 458763, metadata !1, i32 1, i32 1}; [DW_TAG_lexical_block ]
!6 = metadata !{i32 458788, metadata !3, metadata !"int", metadata !3, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5}; [DW_TAG_base_type ]
!7 = metadata !{i32 6, i32 1, metadata !2, null}

4
test/CodeGen/X86/2009-10-16-Scope.ll
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@ -23,10 +23,10 @@ declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
declare i32 @foo(i32) ssp
!0 = metadata !{i32 5, i32 2, metadata !1, null}
!1 = metadata !{i32 458763, metadata !2}; [DW_TAG_lexical_block ]
!1 = metadata !{i32 458763, metadata !2, i32 1, i32 1}; [DW_TAG_lexical_block ]
!2 = metadata !{i32 458798, i32 0, metadata !3, metadata !"bar", metadata !"bar", metadata !"bar", metadata !3, i32 4, null, i1 false, i1 true}; [DW_TAG_subprogram ]
!3 = metadata !{i32 458769, i32 0, i32 12, metadata !"genmodes.i", metadata !"/Users/yash/Downloads", metadata !"clang 1.1", i1 true, i1 false, metadata !"", i32 0}; [DW_TAG_compile_unit ]
!4 = metadata !{i32 459008, metadata !5, metadata !"count_", metadata !3, i32 5, metadata !6}; [ DW_TAG_auto_variable ]
!5 = metadata !{i32 458763, metadata !1}; [DW_TAG_lexical_block ]
!5 = metadata !{i32 458763, metadata !1, i32 1, i32 1}; [DW_TAG_lexical_block ]
!6 = metadata !{i32 458788, metadata !3, metadata !"int", metadata !3, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5}; [DW_TAG_base_type ]
!7 = metadata !{i32 6, i32 1, metadata !2, null}

2
test/DebugInfo/2010-01-05-DbgScope.ll
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@ -9,7 +9,7 @@ entry:
}
!0 = metadata !{i32 571, i32 3, metadata !1, null}
!1 = metadata !{i32 458763, metadata !2}; [DW_TAG_lexical_block ]
!1 = metadata !{i32 458763, metadata !2, i32 1, i32 1}; [DW_TAG_lexical_block ]
!2 = metadata !{i32 458798, i32 0, metadata !3, metadata !"foo", metadata !"foo", metadata !"foo", metadata !3, i32 561, metadata !4, i1 false, i1 true}; [DW_TAG_subprogram ]
!3 = metadata !{i32 458769, i32 0, i32 12, metadata !"hashtab.c", metadata !"/usr/src/gnu/usr.bin/cc/cc_tools/../../../../contrib/gcclibs/libiberty", metadata !"clang 1.1", i1 true, i1 false, metadata !"", i32 0}; [DW_TAG_compile_unit ]
!4 = metadata !{i32 458773, metadata !3, metadata !"", null, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !5, i32 0}; [DW_TAG_subroutine_type ]