[libunwind] [compiler-rt] [lld] [clang-tools-extra] [clang] [lldb] [libcxx] [flang] [llvm] [libc] [Driver,CodeGen] Support -mtls-dialect= (PR #79256)
Fangrui Song via cfe-commits
cfe-commits at lists.llvm.org
Wed Jan 24 17:52:47 PST 2024
https://github.com/MaskRay updated https://github.com/llvm/llvm-project/pull/79256
>From be08e64c2c1f433b017185ce78525ad097e609be Mon Sep 17 00:00:00 2001
From: Fangrui Song <i at maskray.me>
Date: Tue, 23 Jan 2024 21:37:04 -0800
Subject: [PATCH 1/2] =?UTF-8?q?[=F0=9D=98=80=F0=9D=97=BD=F0=9D=97=BF]=20in?=
=?UTF-8?q?itial=20version?=
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Created using spr 1.3.4
---
clang/include/clang/Basic/CodeGenOptions.def | 3 +++
clang/include/clang/Driver/Options.td | 5 +++++
clang/lib/CodeGen/BackendUtil.cpp | 1 +
clang/lib/Driver/ToolChains/Clang.cpp | 23 ++++++++++++++++++++
clang/test/CodeGen/RISCV/tls-dialect.c | 13 +++++++++++
clang/test/Driver/tls-dialect.c | 19 ++++++++++++++++
6 files changed, 64 insertions(+)
create mode 100644 clang/test/CodeGen/RISCV/tls-dialect.c
create mode 100644 clang/test/Driver/tls-dialect.c
diff --git a/clang/include/clang/Basic/CodeGenOptions.def b/clang/include/clang/Basic/CodeGenOptions.def
index 2f2e45d5cf63dfa..7c0bfe328496147 100644
--- a/clang/include/clang/Basic/CodeGenOptions.def
+++ b/clang/include/clang/Basic/CodeGenOptions.def
@@ -369,6 +369,9 @@ ENUM_CODEGENOPT(VecLib, llvm::driver::VectorLibrary, 3, llvm::driver::VectorLibr
/// The default TLS model to use.
ENUM_CODEGENOPT(DefaultTLSModel, TLSModel, 2, GeneralDynamicTLSModel)
+/// Whether to enable TLSDESC. AArch64 enables TLSDESC regardless of this value.
+CODEGENOPT(EnableTLSDESC, 1, 0)
+
/// Bit size of immediate TLS offsets (0 == use the default).
VALUE_CODEGENOPT(TLSSize, 8, 0)
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index 7f4fa33748facaf..773bc1dcda01d5c 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -4419,6 +4419,8 @@ def mtls_size_EQ : Joined<["-"], "mtls-size=">, Group<m_Group>,
HelpText<"Specify bit size of immediate TLS offsets (AArch64 ELF only): "
"12 (for 4KB) | 24 (for 16MB, default) | 32 (for 4GB) | 48 (for 256TB, needs -mcmodel=large)">,
MarshallingInfoInt<CodeGenOpts<"TLSSize">>;
+def mtls_dialect_EQ : Joined<["-"], "mtls-dialect=">, Group<m_Group>,
+ Flags<[TargetSpecific]>, HelpText<"Which thread-local storage dialect to use for dynamic accesses of TLS variables">;
def mimplicit_it_EQ : Joined<["-"], "mimplicit-it=">, Group<m_Group>;
def mdefault_build_attributes : Joined<["-"], "mdefault-build-attributes">, Group<m_Group>;
def mno_default_build_attributes : Joined<["-"], "mno-default-build-attributes">, Group<m_Group>;
@@ -7066,6 +7068,9 @@ def fexperimental_assignment_tracking_EQ : Joined<["-"], "fexperimental-assignme
Values<"disabled,enabled,forced">, NormalizedValues<["Disabled","Enabled","Forced"]>,
MarshallingInfoEnum<CodeGenOpts<"AssignmentTrackingMode">, "Enabled">;
+def enable_tlsdesc : Flag<["-"], "enable-tlsdesc">,
+ MarshallingInfoFlag<CodeGenOpts<"EnableTLSDESC">>;
+
} // let Visibility = [CC1Option]
//===----------------------------------------------------------------------===//
diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index ec203f6f28bc173..7877e20d77f7724 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -401,6 +401,7 @@ static bool initTargetOptions(DiagnosticsEngine &Diags,
Options.UniqueBasicBlockSectionNames =
CodeGenOpts.UniqueBasicBlockSectionNames;
Options.TLSSize = CodeGenOpts.TLSSize;
+ Options.EnableTLSDESC = CodeGenOpts.EnableTLSDESC;
Options.EmulatedTLS = CodeGenOpts.EmulatedTLS;
Options.DebuggerTuning = CodeGenOpts.getDebuggerTuning();
Options.EmitStackSizeSection = CodeGenOpts.StackSizeSection;
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 5dc614e11aab599..93fd579eb92ba50 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -5822,6 +5822,29 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
Args.AddLastArg(CmdArgs, options::OPT_mtls_size_EQ);
}
+ if (Arg *A = Args.getLastArg(options::OPT_mtls_dialect_EQ)) {
+ StringRef V = A->getValue();
+ bool SupportedArgument = false, EnableTLSDESC = false;
+ bool Unsupported = !Triple.isOSBinFormatELF();
+ if (Triple.isRISCV()) {
+ SupportedArgument = V == "desc" || V == "trad";
+ EnableTLSDESC = V == "desc";
+ } else if (Triple.isX86()) {
+ SupportedArgument = V == "gnu";
+ } else {
+ Unsupported = true;
+ }
+ if (Unsupported) {
+ D.Diag(diag::err_drv_unsupported_opt_for_target)
+ << A->getSpelling() << TripleStr;
+ } else if (!SupportedArgument) {
+ D.Diag(diag::err_drv_unsupported_option_argument_for_target)
+ << A->getSpelling() << V << TripleStr;
+ } else if (EnableTLSDESC) {
+ CmdArgs.push_back("-enable-tlsdesc");
+ }
+ }
+
// Add the target cpu
std::string CPU = getCPUName(D, Args, Triple, /*FromAs*/ false);
if (!CPU.empty()) {
diff --git a/clang/test/CodeGen/RISCV/tls-dialect.c b/clang/test/CodeGen/RISCV/tls-dialect.c
new file mode 100644
index 000000000000000..5a1bfa539321269
--- /dev/null
+++ b/clang/test/CodeGen/RISCV/tls-dialect.c
@@ -0,0 +1,13 @@
+/// cc1 -enable-tlsdesc (due to -mtls-dialect=desc) enables TLSDESC.
+// RUN: %clang_cc1 -triple riscv64 -S -mrelocation-model pic -pic-level 1 -enable-tlsdesc %s -o - | FileCheck %s --check-prefix=DESC
+// RUN: %clang_cc1 -triple riscv64 -S -mrelocation-model pic -pic-level 1 %s -o - | FileCheck %s --check-prefix=NODESC
+
+__thread int x;
+
+// DESC: %tlsdesc_hi
+// DESC-NOT: %tls_gd_pcrel_hi
+// NODESC: %tls_gd_pcrel_hi
+// NODESC-NOT: %tlsdesc_hi
+int use() {
+ return x;
+}
diff --git a/clang/test/Driver/tls-dialect.c b/clang/test/Driver/tls-dialect.c
new file mode 100644
index 000000000000000..d90200998e3b06b
--- /dev/null
+++ b/clang/test/Driver/tls-dialect.c
@@ -0,0 +1,19 @@
+// RUN: %clang -### --target=riscv64-freebsd -mtls-dialect=desc %s 2>&1 | FileCheck --check-prefix=DESC %s
+// RUN: %clang -### --target=riscv64-linux -mtls-dialect=trad %s 2>&1 | FileCheck --check-prefix=NODESC %s
+// RUN: %clang -### --target=riscv64-linux %s 2>&1 | FileCheck --check-prefix=NODESC %s
+// RUN: %clang -### --target=x86_64-linux -mtls-dialect=gnu %s 2>&1 | FileCheck --check-prefix=NODESC %s
+
+/// Unsupported target
+/// GCC supports -mtls-dialect= for AArch64, but we just unsupport it for AArch64 as it is very rarely used.
+// RUN: not %clang --target=aarch64-linux -mtls-dialect=desc %s 2>&1 | FileCheck --check-prefix=UNSUPPORTED-TARGET %s
+// RUN: not %clang --target=x86_64-apple-macos -mtls-dialect=desc %s 2>&1 | FileCheck -check-prefix=UNSUPPORTED-TARGET %s
+
+/// Unsupported argument
+// RUN: not %clang -### --target=riscv64-linux -mtls-dialect=gnu2 %s 2>&1 | FileCheck --check-prefix=UNSUPPORTED-ARG %s
+// RUN: not %clang -### --target=x86_64-linux -mtls-dialect=gnu2 %s 2>&1 | FileCheck --check-prefix=UNSUPPORTED-ARG %s
+
+// DESC: "-cc1" {{.*}}"-enable-tlsdesc"
+// NODESC-NOT: "-enable-tlsdesc"
+
+// UNSUPPORTED-TARGET: error: unsupported option '-mtls-dialect=' for target
+// UNSUPPORTED-ARG: error: unsupported argument 'gnu2' to option '-mtls-dialect=' for target
>From d09738ee4480bd45301dcc0a497b4eed9d68dbd3 Mon Sep 17 00:00:00 2001
From: Fangrui Song <i at maskray.me>
Date: Tue, 23 Jan 2024 21:44:19 -0800
Subject: [PATCH 2/2] add REQUIRES since clang/test/CodeGen/RISCV doesn't
require it
Created using spr 1.3.4
---
clang/test/CodeGen/RISCV/tls-dialect.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/clang/test/CodeGen/RISCV/tls-dialect.c b/clang/test/CodeGen/RISCV/tls-dialect.c
index 5a1bfa539321269..e624a8b3fe4e676 100644
--- a/clang/test/CodeGen/RISCV/tls-dialect.c
+++ b/clang/test/CodeGen/RISCV/tls-dialect.c
@@ -1,3 +1,4 @@
+// REQUIRES: riscv-registered-target
/// cc1 -enable-tlsdesc (due to -mtls-dialect=desc) enables TLSDESC.
// RUN: %clang_cc1 -triple riscv64 -S -mrelocation-model pic -pic-level 1 -enable-tlsdesc %s -o - | FileCheck %s --check-prefix=DESC
// RUN: %clang_cc1 -triple riscv64 -S -mrelocation-model pic -pic-level 1 %s -o - | FileCheck %s --check-prefix=NODESC
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