tra created this revision.
tra added reviewers: dblaikie, ABataev.
Herald added a subscriber: bixia.
tra requested review of this revision.
Herald added a project: clang.
This is needed for CUDA compilation where NVPTX back-end only supports DWARF2,
but host compilation should be allowed to use newer DWARF versions.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D92617
Files:
clang/include/clang/Driver/ToolChain.h
clang/lib/Driver/ToolChains/Clang.cpp
clang/lib/Driver/ToolChains/Cuda.h
clang/test/Driver/cuda-unsupported-debug-options.cu
Index: clang/test/Driver/cuda-unsupported-debug-options.cu
===================================================================
--- clang/test/Driver/cuda-unsupported-debug-options.cu
+++ clang/test/Driver/cuda-unsupported-debug-options.cu
@@ -18,5 +18,7 @@
// CHECK-NOT: debug information option '{{.*}}' is not supported for target
'x86
// CHECK: "-triple" "nvptx64-nvidia-cuda"
// CHECK-NOT:
{{-compress-debug|-fdebug-info-for-profiling|lldb|codeview|module-format|embed-source|debug-info-macro|gnu-pubnames|generate-arange-section|generate-type-units}}
+// Make sure we do not see any dwarf version other than 2, regardless of
what's used on the host side.
+// CHECK-NOT: {{-dwarf-version=[^2]}}
// CHECK: "-triple" "x86_64
// CHECK-SAME:
{{-compress-debug|-fdebug-info-for-profiling|split-dwarf|lldb|codeview|module-format|embed-source|debug-info-macro|gnu-pubnames|generate-arange-section|generate-type-units}}
Index: clang/lib/Driver/ToolChains/Cuda.h
===================================================================
--- clang/lib/Driver/ToolChains/Cuda.h
+++ clang/lib/Driver/ToolChains/Cuda.h
@@ -185,6 +185,8 @@
const llvm::opt::ArgList &Args) const override;
unsigned GetDefaultDwarfVersion() const override { return 2; }
+ // NVPTX supports only DWARF2.
+ unsigned GetAdjustedDwarfVersion(unsigned v) const override { return 2; }
const ToolChain &HostTC;
CudaInstallationDetector CudaInstallation;
Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -3854,6 +3854,8 @@
DWARFVersion = ExplicitVersion;
}
+ auto AdjustedDwarfVersion = TC.GetAdjustedDwarfVersion(DWARFVersion);
+
// -gline-directives-only supported only for the DWARF debug info.
if (DWARFVersion == 0 && DebugInfoKind ==
codegenoptions::DebugDirectivesOnly)
DebugInfoKind = codegenoptions::NoDebugInfo;
@@ -3918,6 +3920,11 @@
if (DWARFVersion < 5)
D.Diag(diag::err_drv_argument_only_allowed_with)
<< A->getAsString(Args) << "-gdwarf-5";
+ else if (AdjustedDwarfVersion < 5)
+ // The toolchain has reduced allowed dwarf version, so we can't enable
+ // -gembed-source.
+ D.Diag(diag::warn_drv_unsupported_debug_info_opt_for_target)
+ << A->getAsString(Args) << TC.getTripleString();
else if (checkDebugInfoOption(A, Args, D, TC))
CmdArgs.push_back("-gembed-source");
}
@@ -3946,7 +3953,7 @@
DebugInfoKind <= codegenoptions::DebugDirectivesOnly)
DebugInfoKind = codegenoptions::DebugLineTablesOnly;
- RenderDebugEnablingArgs(Args, CmdArgs, DebugInfoKind, DWARFVersion,
+ RenderDebugEnablingArgs(Args, CmdArgs, DebugInfoKind, AdjustedDwarfVersion,
DebuggerTuning);
// -fdebug-macro turns on macro debug info generation.
Index: clang/include/clang/Driver/ToolChain.h
===================================================================
--- clang/include/clang/Driver/ToolChain.h
+++ clang/include/clang/Driver/ToolChain.h
@@ -489,6 +489,11 @@
// to the contrary.
virtual unsigned GetDefaultDwarfVersion() const { return 4; }
+ // Some toolchains may have different restrictions on the DWARF version and
+ // may need to adjust it. E.g. NVPTX may need to enforce DWARF2 even when
host
+ // compilation uses DWARF5.
+ virtual unsigned GetAdjustedDwarfVersion(unsigned v) const { return v; }
+
// True if the driver should assume "-fstandalone-debug"
// in the absence of an option specifying otherwise,
// provided that debugging was requested in the first place.
Index: clang/test/Driver/cuda-unsupported-debug-options.cu
===================================================================
--- clang/test/Driver/cuda-unsupported-debug-options.cu
+++ clang/test/Driver/cuda-unsupported-debug-options.cu
@@ -18,5 +18,7 @@
// CHECK-NOT: debug information option '{{.*}}' is not supported for target 'x86
// CHECK: "-triple" "nvptx64-nvidia-cuda"
// CHECK-NOT: {{-compress-debug|-fdebug-info-for-profiling|lldb|codeview|module-format|embed-source|debug-info-macro|gnu-pubnames|generate-arange-section|generate-type-units}}
+// Make sure we do not see any dwarf version other than 2, regardless of what's used on the host side.
+// CHECK-NOT: {{-dwarf-version=[^2]}}
// CHECK: "-triple" "x86_64
// CHECK-SAME: {{-compress-debug|-fdebug-info-for-profiling|split-dwarf|lldb|codeview|module-format|embed-source|debug-info-macro|gnu-pubnames|generate-arange-section|generate-type-units}}
Index: clang/lib/Driver/ToolChains/Cuda.h
===================================================================
--- clang/lib/Driver/ToolChains/Cuda.h
+++ clang/lib/Driver/ToolChains/Cuda.h
@@ -185,6 +185,8 @@
const llvm::opt::ArgList &Args) const override;
unsigned GetDefaultDwarfVersion() const override { return 2; }
+ // NVPTX supports only DWARF2.
+ unsigned GetAdjustedDwarfVersion(unsigned v) const override { return 2; }
const ToolChain &HostTC;
CudaInstallationDetector CudaInstallation;
Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -3854,6 +3854,8 @@
DWARFVersion = ExplicitVersion;
}
+ auto AdjustedDwarfVersion = TC.GetAdjustedDwarfVersion(DWARFVersion);
+
// -gline-directives-only supported only for the DWARF debug info.
if (DWARFVersion == 0 && DebugInfoKind == codegenoptions::DebugDirectivesOnly)
DebugInfoKind = codegenoptions::NoDebugInfo;
@@ -3918,6 +3920,11 @@
if (DWARFVersion < 5)
D.Diag(diag::err_drv_argument_only_allowed_with)
<< A->getAsString(Args) << "-gdwarf-5";
+ else if (AdjustedDwarfVersion < 5)
+ // The toolchain has reduced allowed dwarf version, so we can't enable
+ // -gembed-source.
+ D.Diag(diag::warn_drv_unsupported_debug_info_opt_for_target)
+ << A->getAsString(Args) << TC.getTripleString();
else if (checkDebugInfoOption(A, Args, D, TC))
CmdArgs.push_back("-gembed-source");
}
@@ -3946,7 +3953,7 @@
DebugInfoKind <= codegenoptions::DebugDirectivesOnly)
DebugInfoKind = codegenoptions::DebugLineTablesOnly;
- RenderDebugEnablingArgs(Args, CmdArgs, DebugInfoKind, DWARFVersion,
+ RenderDebugEnablingArgs(Args, CmdArgs, DebugInfoKind, AdjustedDwarfVersion,
DebuggerTuning);
// -fdebug-macro turns on macro debug info generation.
Index: clang/include/clang/Driver/ToolChain.h
===================================================================
--- clang/include/clang/Driver/ToolChain.h
+++ clang/include/clang/Driver/ToolChain.h
@@ -489,6 +489,11 @@
// to the contrary.
virtual unsigned GetDefaultDwarfVersion() const { return 4; }
+ // Some toolchains may have different restrictions on the DWARF version and
+ // may need to adjust it. E.g. NVPTX may need to enforce DWARF2 even when host
+ // compilation uses DWARF5.
+ virtual unsigned GetAdjustedDwarfVersion(unsigned v) const { return v; }
+
// True if the driver should assume "-fstandalone-debug"
// in the absence of an option specifying otherwise,
// provided that debugging was requested in the first place.
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