[DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label.

In order to set breakpoints on labels and list source code around
labels, we need collect debug information for labels, i.e., label
name, the function label belong, line number in the file, and the
address label located. In order to keep these information in LLVM
IR and to allow backend to generate debug information correctly.
We create a new kind of metadata for labels, DILabel. The format
of DILabel is

!DILabel(scope: !1, name: "foo", file: !2, line: 3)

We hope to keep debug information as much as possible even the
code is optimized. So, we create a new kind of intrinsic for label
metadata to avoid the metadata is eliminated with basic block.
The intrinsic will keep existing if we keep it from optimized out.
The format of the intrinsic is

llvm.dbg.label(metadata !1)

It has only one argument, that is the DILabel metadata. The
intrinsic will follow the label immediately. Backend could get the
label metadata through the intrinsic's parameter.

We also create DIBuilder API for labels to be used by Frontend.
Frontend could use createLabel() to allocate DILabel objects, and use
insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR.

Differential Revision: https://reviews.llvm.org/D45024

Patch by Hsiangkai Wang.

llvm-svn: 331841

10 files changed, 11 insertions, 11 deletions

diff --git a/llvm/test/Transforms/AddDiscriminators/basic.ll b/llvm/test/Transforms/AddDiscriminators/basic.ll
index a781c0d409b..da0d22aa93f 100644
--- a/llvm/test/Transforms/AddDiscriminators/basic.ll
+++ b/llvm/test/Transforms/AddDiscriminators/basic.ll
@@ -45,7 +45,7 @@ attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointe
 !0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: NoDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
 !1 = !DIFile(filename: "basic.c", directory: ".")
 !2 = !{}
-!4 = distinct !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
+!4 = distinct !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, retainedNodes: !2)
 !5 = !DIFile(filename: "basic.c", directory: ".")
 !6 = !DISubroutineType(types: !2)
 !7 = !{i32 2, !"Dwarf Version", i32 4}
diff --git a/llvm/test/Transforms/AddDiscriminators/call-nested.ll b/llvm/test/Transforms/AddDiscriminators/call-nested.ll
index 4d5145abafe..d96ff31c6a2 100644
--- a/llvm/test/Transforms/AddDiscriminators/call-nested.ll
+++ b/llvm/test/Transforms/AddDiscriminators/call-nested.ll
@@ -34,7 +34,7 @@ attributes #1 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-
 !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.9.0 (trunk 266269)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
 !1 = !DIFile(filename: "test.cc", directory: "")
 !2 = !{}
-!4 = distinct !DISubprogram(name: "baz", linkageName: "_Z3bazv", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !2)
+!4 = distinct !DISubprogram(name: "baz", linkageName: "_Z3bazv", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !2)
 !5 = !DISubroutineType(types: !6)
 !6 = !{!7}
 !7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
diff --git a/llvm/test/Transforms/AddDiscriminators/call.ll b/llvm/test/Transforms/AddDiscriminators/call.ll
index 49aca5a488f..d20645d0ed1 100644
--- a/llvm/test/Transforms/AddDiscriminators/call.ll
+++ b/llvm/test/Transforms/AddDiscriminators/call.ll
@@ -37,7 +37,7 @@ attributes #1 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-
 !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 250915) (llvm/trunk 251830)", isOptimized: false, runtimeVersion: 0, emissionKind: NoDebug, enums: !2)
 !1 = !DIFile(filename: "c.cc", directory: "/tmp")
 !2 = !{}
-!4 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
+!4 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
 !5 = !DISubroutineType(types: !6)
 !6 = !{null}
 !7 = !{i32 2, !"Dwarf Version", i32 4}
diff --git a/llvm/test/Transforms/AddDiscriminators/diamond.ll b/llvm/test/Transforms/AddDiscriminators/diamond.ll
index 307e95f41e1..a2f80d23467 100644
--- a/llvm/test/Transforms/AddDiscriminators/diamond.ll
+++ b/llvm/test/Transforms/AddDiscriminators/diamond.ll
@@ -50,7 +50,7 @@ attributes #2 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-
 !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 253273)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
 !1 = !DIFile(filename: "a.cc", directory: "/tmp")
 !2 = !{}
-!4 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooi", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
+!4 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooi", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
 !5 = !DISubroutineType(types: !6)
 !6 = !{null, !7}
 !7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
diff --git a/llvm/test/Transforms/AddDiscriminators/first-only.ll b/llvm/test/Transforms/AddDiscriminators/first-only.ll
index dd2117a5b18..0417a61bbfc 100644
--- a/llvm/test/Transforms/AddDiscriminators/first-only.ll
+++ b/llvm/test/Transforms/AddDiscriminators/first-only.ll
@@ -54,7 +54,7 @@ attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointe
 !0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 (trunk 199750) (llvm/trunk 199751)", isOptimized: false, emissionKind: NoDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
 !1 = !DIFile(filename: "first-only.c", directory: ".")
 !2 = !{}
-!4 = distinct !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
+!4 = distinct !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, retainedNodes: !2)
 !5 = !DIFile(filename: "first-only.c", directory: ".")
 !6 = !DISubroutineType(types: !{null})
 !7 = !{i32 2, !"Dwarf Version", i32 4}
diff --git a/llvm/test/Transforms/AddDiscriminators/inlined.ll b/llvm/test/Transforms/AddDiscriminators/inlined.ll
index 226e903ee21..bb50f48a37e 100644
--- a/llvm/test/Transforms/AddDiscriminators/inlined.ll
+++ b/llvm/test/Transforms/AddDiscriminators/inlined.ll
@@ -54,12 +54,12 @@ attributes #3 = { nounwind readnone }
 !5 = !{i32 1, !"PIC Level", i32 2}
 !6 = !{!"LLVM version 4.0.0"}
 ; CHECK: ![[F:.*]] = distinct !DISubprogram(name: "f",
-!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, variables: !2)
+!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, retainedNodes: !2)
 !8 = !DISubroutineType(types: !9)
 !9 = !{!10}
 !10 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
 !11 = !DILocation(line: 1, column: 56, scope: !12, inlinedAt: !13)
-!12 = distinct !DISubprogram(name: "g", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, variables: !2)
+!12 = distinct !DISubprogram(name: "g", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, retainedNodes: !2)
 !13 = distinct !DILocation(line: 1, column: 17, scope: !14)
 ; CHECK: ![[BF:.*]] = !DILexicalBlockFile(scope: ![[LB1:[0-9]+]],
 ; CHECK-SAME:                             discriminator: 2)
diff --git a/llvm/test/Transforms/AddDiscriminators/memcpy-discriminator.ll b/llvm/test/Transforms/AddDiscriminators/memcpy-discriminator.ll
index f70c3dca3bd..c895d0d71e9 100644
--- a/llvm/test/Transforms/AddDiscriminators/memcpy-discriminator.ll
+++ b/llvm/test/Transforms/AddDiscriminators/memcpy-discriminator.ll
@@ -97,7 +97,7 @@ attributes #1 = { argmemonly nounwind }
 !2 = !{}
 !3 = !{i32 2, !"Dwarf Version", i32 4}
 !4 = !{i32 2, !"Debug Info Version", i32 3}
-!5 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 15, type: !6, isLocal: false, isDefinition: true, scopeLine: 15, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
+!5 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 15, type: !6, isLocal: false, isDefinition: true, scopeLine: 15, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
 !6 = !DISubroutineType(types: !2)
 !7 = !DILocation(line: 16, column: 16, scope: !5)
 !8 = !DILocation(line: 16, column: 23, scope: !5)
diff --git a/llvm/test/Transforms/AddDiscriminators/multiple.ll b/llvm/test/Transforms/AddDiscriminators/multiple.ll
index b4c353cf00f..ea75ee1890a 100644
--- a/llvm/test/Transforms/AddDiscriminators/multiple.ll
+++ b/llvm/test/Transforms/AddDiscriminators/multiple.ll
@@ -55,7 +55,7 @@ attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointe
 !0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 (trunk 199750) (llvm/trunk 199751)", isOptimized: false, emissionKind: NoDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
 !1 = !DIFile(filename: "multiple.c", directory: ".")
 !2 = !{}
-!4 = distinct !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
+!4 = distinct !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, retainedNodes: !2)
 !5 = !DIFile(filename: "multiple.c", directory: ".")
 !6 = !DISubroutineType(types: !{null, !13})
 !13 = !DIBasicType(encoding: DW_ATE_signed, name: "int", size: 32, align: 32)
diff --git a/llvm/test/Transforms/AddDiscriminators/no-discriminators.ll b/llvm/test/Transforms/AddDiscriminators/no-discriminators.ll
index 5fd8b0fa5a2..7248ad05f47 100644
--- a/llvm/test/Transforms/AddDiscriminators/no-discriminators.ll
+++ b/llvm/test/Transforms/AddDiscriminators/no-discriminators.ll
@@ -57,7 +57,7 @@ attributes #1 = { nounwind readnone }
 !0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
 !1 = !DIFile(filename: "no-discriminators", directory: ".")
 !2 = !{}
-!4 = distinct !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
+!4 = distinct !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, retainedNodes: !2)
 ; CHECK: ![[FOO:[0-9]+]] = distinct !DISubprogram(name: "foo"
 !5 = !DIFile(filename: "no-discriminators", directory: ".")
 !6 = !DISubroutineType(types: !7)
diff --git a/llvm/test/Transforms/AddDiscriminators/oneline.ll b/llvm/test/Transforms/AddDiscriminators/oneline.ll
index 724574a24dd..5eeeb9ba083 100644
--- a/llvm/test/Transforms/AddDiscriminators/oneline.ll
+++ b/llvm/test/Transforms/AddDiscriminators/oneline.ll
@@ -62,7 +62,7 @@ attributes #1 = { nounwind readnone }
 !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 250915)", isOptimized: true, runtimeVersion: 0, emissionKind: NoDebug, enums: !2)
 !1 = !DIFile(filename: "a.cc", directory: "/usr/local/google/home/dehao/discr")
 !2 = !{}
-!4 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooi", scope: !1, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !8)
+!4 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooi", scope: !1, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !8)
 !5 = !DISubroutineType(types: !6)
 !6 = !{!7, !7}
 !7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)