This revision was automatically updated to reflect the committed changes.
Closed by commit rG6d0389038451: [CodeView] Add option to disable inline line
tables. (authored by akhuang).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D67723/new/
https://reviews.llvm.org/D67723
Files:
clang/include/clang/Basic/CodeGenOptions.def
clang/include/clang/Driver/Options.td
clang/lib/CodeGen/CodeGenFunction.cpp
clang/lib/Driver/ToolChains/Clang.cpp
clang/lib/Frontend/CompilerInvocation.cpp
clang/test/CodeGen/debug-info-no-inline-line-tables.c
llvm/docs/LangRef.rst
llvm/include/llvm/IR/Attributes.td
llvm/lib/Transforms/Utils/InlineFunction.cpp
llvm/test/Transforms/Inline/no-inline-line-tables.ll
Index: llvm/test/Transforms/Inline/no-inline-line-tables.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/Inline/no-inline-line-tables.ll
@@ -0,0 +1,99 @@
+; RUN: opt < %s -inline -S | FileCheck %s
+
+; This tests that functions with the attribute `no-inline-line-tables` have the
+; correct debug information when they are inlined.
+
+; ModuleID = 't.c'
+source_filename = "t.c"
+target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-windows-msvc"
+
+; Function Attrs: alwaysinline nounwind
+define dso_local i32 @f(i32 %x) #0 !dbg !7 {
+entry:
+ %x.addr = alloca i32, align 4
+ store i32 %x, i32* %x.addr, align 4
+ call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !12, metadata !DIExpression()), !dbg !13
+ %0 = load i32, i32* %x.addr, align 4, !dbg !14
+ ret i32 %0, !dbg !14
+}
+
+; Function Attrs: nounwind readnone speculatable willreturn
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+
+; Function Attrs: alwaysinline nounwind
+define i32 @g(i32 %x) #0 !dbg !15 {
+entry:
+ %x.addr = alloca i32, align 4
+ store i32 %x, i32* %x.addr, align 4
+ call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !16, metadata !DIExpression()), !dbg !17
+ br label %L, !dbg !17
+
+L: ; preds = %entry
+ call void @llvm.dbg.label(metadata !18), !dbg !19
+ store i32 42, i32* %x.addr, align 4, !dbg !20
+ %0 = load i32, i32* %x.addr, align 4, !dbg !21
+ ret i32 %0, !dbg !21
+}
+
+; Function Attrs: nounwind readnone speculatable willreturn
+declare void @llvm.dbg.label(metadata) #1
+
+; Check that debug info for inlined code uses the call location and that debug
+; intrinsics are removed.
+; Function Attrs: noinline nounwind optnone
+define i32 @main() #2 !dbg !22 {
+entry:
+; CHECK-LABEL: @main()
+; CHECK-NOT: @f
+; CHECK-NOT: @llvm.dbg.declare
+; CHECK: %{{[0-9]+}} = load i32, i32* %x.addr.i, align 4, !dbg ![[VAR1:[0-9]+]]
+ %call = call i32 @f(i32 3), !dbg !25
+
+; Another test for inlining debug intrinsics where the intrinsic appears at the
+; start of the basic block.
+; CHECK-NOT: @g
+; CHECK-NOT: @llvm.dbg.label
+; CHECK: %{{[0-9]+}} = load i32, i32* %x.addr.i1, align 4, !dbg ![[VAR2:[0-9]+]]
+ %call1 = call i32 @g(i32 340), !dbg !26
+ ret i32 0, !dbg !27
+}
+
+; CHECK: ![[VAR1]] = !DILocation(line: 10, scope: ![[SCOPE:[0-9]+]])
+; CHECK: ![[VAR2]] = !DILocation(line: 11, scope: ![[SCOPE]])
+
+attributes #0 = { alwaysinline nounwind "no-inline-line-tables" }
+attributes #2 = { noinline nounwind optnone "no-inline-line-tables"}
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (https://github.com/llvm/llvm-project.git 03ec3a12a94bbbaa11999b6da3a43221a5aa54a5)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
+!1 = !DIFile(filename: "<stdin>", directory: "/usr/local/google/home/akhuang/testing/inline-line-tables", checksumkind: CSK_MD5, checksum: "38a4785b48742d3ea655b8f3461436a4")
+!2 = !{}
+!3 = !{i32 2, !"CodeView", i32 1}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{!"clang version 10.0.0 (https://github.com/llvm/llvm-project.git 03ec3a12a94bbbaa11999b6da3a43221a5aa54a5)"}
+!7 = distinct !DISubprogram(name: "f", scope: !8, file: !8, line: 1, type: !9, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
+!8 = !DIFile(filename: "t.c", directory: "/usr/local/google/home/akhuang/testing/inline-line-tables", checksumkind: CSK_MD5, checksum: "38a4785b48742d3ea655b8f3461436a4")
+!9 = !DISubroutineType(types: !10)
+!10 = !{!11, !11}
+!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!12 = !DILocalVariable(name: "x", arg: 1, scope: !7, file: !8, line: 1, type: !11)
+!13 = !DILocation(line: 1, scope: !7)
+!14 = !DILocation(line: 2, scope: !7)
+!15 = distinct !DISubprogram(name: "g", scope: !8, file: !8, line: 4, type: !9, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
+!16 = !DILocalVariable(name: "x", arg: 1, scope: !15, file: !8, line: 4, type: !11)
+!17 = !DILocation(line: 4, scope: !15)
+!18 = !DILabel(scope: !15, name: "L", file: !8, line: 5)
+!19 = !DILocation(line: 5, scope: !15)
+!20 = !DILocation(line: 6, scope: !15)
+!21 = !DILocation(line: 7, scope: !15)
+!22 = distinct !DISubprogram(name: "main", scope: !8, file: !8, line: 9, type: !23, scopeLine: 9, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
+!23 = !DISubroutineType(types: !24)
+!24 = !{!11}
+!25 = !DILocation(line: 10, scope: !22)
+!26 = !DILocation(line: 11, scope: !22)
+!27 = !DILocation(line: 12, scope: !22)
Index: llvm/lib/Transforms/Utils/InlineFunction.cpp
===================================================================
--- llvm/lib/Transforms/Utils/InlineFunction.cpp
+++ llvm/lib/Transforms/Utils/InlineFunction.cpp
@@ -1405,6 +1405,10 @@
// other.
DenseMap<const MDNode *, MDNode *> IANodes;
+ // Check if we are not generating inline line tables and want to use
+ // the call site location instead.
+ bool NoInlineLineTables = Fn->hasFnAttribute("no-inline-line-tables");
+
for (; FI != Fn->end(); ++FI) {
for (BasicBlock::iterator BI = FI->begin(), BE = FI->end();
BI != BE; ++BI) {
@@ -1416,20 +1420,22 @@
BI->setMetadata(LLVMContext::MD_loop, NewLoopID);
}
- if (DebugLoc DL = BI->getDebugLoc()) {
- DebugLoc IDL =
- inlineDebugLoc(DL, InlinedAtNode, BI->getContext(), IANodes);
- BI->setDebugLoc(IDL);
- continue;
- }
+ if (!NoInlineLineTables)
+ if (DebugLoc DL = BI->getDebugLoc()) {
+ DebugLoc IDL =
+ inlineDebugLoc(DL, InlinedAtNode, BI->getContext(), IANodes);
+ BI->setDebugLoc(IDL);
+ continue;
+ }
- if (CalleeHasDebugInfo)
+ if (CalleeHasDebugInfo && !NoInlineLineTables)
continue;
- // If the inlined instruction has no line number, make it look as if it
- // originates from the call location. This is important for
- // ((__always_inline__, __nodebug__)) functions which must use caller
- // location for all instructions in their function body.
+ // If the inlined instruction has no line number, or if inline info
+ // is not being generated, make it look as if it originates from the call
+ // location. This is important for ((__always_inline, __nodebug__))
+ // functions which must use caller location for all instructions in their
+ // function body.
// Don't update static allocas, as they may get moved later.
if (auto *AI = dyn_cast<AllocaInst>(BI))
@@ -1438,6 +1444,19 @@
BI->setDebugLoc(TheCallDL);
}
+
+ // Remove debug info intrinsics if we're not keeping inline info.
+ if (NoInlineLineTables) {
+ BasicBlock::iterator BI = FI->begin();
+ while (BI != FI->end()) {
+ if (isa<DbgInfoIntrinsic>(BI)) {
+ BI = BI->eraseFromParent();
+ continue;
+ }
+ ++BI;
+ }
+ }
+
}
}
Index: llvm/include/llvm/IR/Attributes.td
===================================================================
--- llvm/include/llvm/IR/Attributes.td
+++ llvm/include/llvm/IR/Attributes.td
@@ -220,6 +220,7 @@
def NoNansFPMath : StrBoolAttr<"no-nans-fp-math">;
def UnsafeFPMath : StrBoolAttr<"unsafe-fp-math">;
def NoJumpTables : StrBoolAttr<"no-jump-tables">;
+def NoInlineLineTables : StrBoolAttr<"no-inline-line-tables">;
def ProfileSampleAccurate : StrBoolAttr<"profile-sample-accurate">;
class CompatRule<string F> {
Index: llvm/docs/LangRef.rst
===================================================================
--- llvm/docs/LangRef.rst
+++ llvm/docs/LangRef.rst
@@ -1452,6 +1452,13 @@
``naked``
This attribute disables prologue / epilogue emission for the
function. This can have very system-specific consequences.
+``"no-inline-line-tables"``
+ When this attribute is set to true, the inliner discards source locations
+ when inlining code and instead uses the source location of the call site.
+ Breakpoints set on code that was inlined into the current function will
+ not fire during the execution of the inlined call sites. If the debugger
+ stops inside an inlined call site, it will appear to be stopped at the
+ outermost inlined call site.
``no-jump-tables``
When this attribute is set to true, the jump tables and lookup tables that
can be generated from a switch case lowering are disabled.
Index: clang/test/CodeGen/debug-info-no-inline-line-tables.c
===================================================================
--- /dev/null
+++ clang/test/CodeGen/debug-info-no-inline-line-tables.c
@@ -0,0 +1,24 @@
+// RUN: %clang_cc1 -triple x86_64-windows-msvc -debug-info-kind=limited \
+// RUN: -gno-inline-line-tables -emit-llvm -o - %s | FileCheck %s
+
+int x;
+__attribute((always_inline)) void f() {
+ x += 1;
+}
+int main() {
+ f();
+ x += 2;
+ return x;
+}
+
+// Check that clang emits the location of the call site and not the inlined
+// function in the debug info.
+// CHECK: define dso_local i32 @main()
+// CHECK: %{{.+}} = load i32, i32* @x, align 4, !dbg [[DbgLoc:![0-9]+]]
+
+// Check that the no-inline-line-tables attribute is added.
+// CHECK: attributes #0 = {{.*}}"no-inline-line-tables"{{.*}}
+// CHECK: attributes #1 = {{.*}}"no-inline-line-tables"{{.*}}
+
+// CHECK: [[DbgLoc]] = !DILocation(line: 9,
+// CHECK-NOT: inlinedAt:
Index: clang/lib/Frontend/CompilerInvocation.cpp
===================================================================
--- clang/lib/Frontend/CompilerInvocation.cpp
+++ clang/lib/Frontend/CompilerInvocation.cpp
@@ -806,6 +806,7 @@
Opts.RecordCommandLine = Args.getLastArgValue(OPT_record_command_line);
Opts.MergeAllConstants = Args.hasArg(OPT_fmerge_all_constants);
Opts.NoCommon = Args.hasArg(OPT_fno_common);
+ Opts.NoInlineLineTables = Args.hasArg(OPT_gno_inline_line_tables);
Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
Opts.OptimizeSize = getOptimizationLevelSize(Args);
Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -3296,6 +3296,12 @@
}
}
+ // Omit inline line tables if requested.
+ if (!Args.hasFlag(options::OPT_ginline_line_tables,
+ options::OPT_gno_inline_line_tables, false)) {
+ CmdArgs.push_back("-gno-inline-line-tables");
+ }
+
// Adjust the debug info kind for the given toolchain.
TC.adjustDebugInfoKind(DebugInfoKind, Args);
Index: clang/lib/CodeGen/CodeGenFunction.cpp
===================================================================
--- clang/lib/CodeGen/CodeGenFunction.cpp
+++ clang/lib/CodeGen/CodeGenFunction.cpp
@@ -764,6 +764,10 @@
Fn->addFnAttr("no-jump-tables",
llvm::toStringRef(CGM.getCodeGenOpts().NoUseJumpTables));
+ // Add no-inline-line-tables value.
+ if (CGM.getCodeGenOpts().NoInlineLineTables)
+ Fn->addFnAttr("no-inline-line-tables");
+
// Add profile-sample-accurate value.
if (CGM.getCodeGenOpts().ProfileSampleAccurate)
Fn->addFnAttr("profile-sample-accurate");
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -1984,6 +1984,9 @@
HelpText<"Emit type record hashes in a .debug$H section">,
Flags<[CC1Option, CoreOption]>;
def gno_codeview_ghash : Flag<["-"], "gno-codeview-ghash">, Flags<[CoreOption]>;
+def ginline_line_tables : Flag<["-"], "ginline-line-tables">, Flags<[CoreOption]>;
+def gno_inline_line_tables : Flag<["-"], "gno-inline-line-tables">,
+ Flags<[CC1Option, CoreOption]>, HelpText<"Don't emit inline line tables">;
// Equivalent to our default dwarf version. Forces usual dwarf emission when
// CodeView is enabled.
Index: clang/include/clang/Basic/CodeGenOptions.def
===================================================================
--- clang/include/clang/Basic/CodeGenOptions.def
+++ clang/include/clang/Basic/CodeGenOptions.def
@@ -136,6 +136,8 @@
///< enabled.
CODEGENOPT(NoWarn , 1, 0) ///< Set when -Wa,--no-warn is enabled.
CODEGENOPT(EnableSegmentedStacks , 1, 0) ///< Set when -fsplit-stack is enabled.
+CODEGENOPT(NoInlineLineTables, 1, 0) ///< Whether debug info should contain
+ ///< inline line tables.
CODEGENOPT(NoImplicitFloat , 1, 0) ///< Set when -mno-implicit-float is enabled.
CODEGENOPT(NoInfsFPMath , 1, 0) ///< Assume FP arguments, results not +-Inf.
CODEGENOPT(NoSignedZeros , 1, 0) ///< Allow ignoring the signedness of FP zero
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