[AIX][TLS] Relax front end diagnostics to accept the local-exec TLS model

This patch relaxes the front end AIX diagnostics added in D102070 to accept the
local-exec TLS model, as we plan to support this model in a series of future patches.

The diagnostics are relaxed when local-exec is used as a compiler option to
`-ftls-model=*` and in the `__attribute__((tls_model("local-exec")))` attribute.

Differential Revision: https://reviews.llvm.org/D149596

4 files changed, 9 insertions, 6 deletions

diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index f6c04fe..dca8853 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -1894,7 +1894,7 @@ bool CompilerInvocation::ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args,
   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
     if (T.isOSAIX()) {
       StringRef Name = A->getValue();
-      if (Name != "global-dynamic")
+      if (Name != "global-dynamic" && Name != "local-exec")
         Diags.Report(diag::err_aix_unsupported_tls_model) << Name;
     }
   }
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 40438214..d9146a8 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -2039,7 +2039,7 @@ static void handleTLSModelAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   }
 
   if (S.Context.getTargetInfo().getTriple().isOSAIX() &&
-      Model != "global-dynamic") {
+      Model != "global-dynamic" && Model != "local-exec") {
     S.Diag(LiteralLoc, diag::err_aix_attr_unsupported_tls_model) << Model;
     return;
   }
diff --git a/clang/test/CodeGen/PowerPC/aix-tls-model.cpp b/clang/test/CodeGen/PowerPC/aix-tls-model.cpp
index a531f55..2b53df54 100644
--- a/clang/test/CodeGen/PowerPC/aix-tls-model.cpp
+++ b/clang/test/CodeGen/PowerPC/aix-tls-model.cpp
@@ -2,12 +2,12 @@
 // RUN: %clang_cc1 %s -triple powerpc-unknown-aix -target-cpu pwr8 -ftls-model=global-dynamic -emit-llvm -o - | FileCheck %s -check-prefix=CHECK-GD
 // RUN: not %clang_cc1 %s -triple powerpc-unknown-aix -target-cpu pwr8 -ftls-model=local-dynamic -emit-llvm 2>&1 | FileCheck %s -check-prefix=CHECK-LD-ERROR
 // RUN: not %clang_cc1 %s -triple powerpc-unknown-aix -target-cpu pwr8 -ftls-model=initial-exec -emit-llvm  2>&1 | FileCheck %s -check-prefix=CHECK-IE-ERROR
-// RUN: not %clang_cc1 %s -triple powerpc-unknown-aix -target-cpu pwr8 -ftls-model=local-exec -emit-llvm 2>&1 | FileCheck %s -check-prefix=CHECK-LE-ERROR
+// RUN: %clang_cc1 %s -triple powerpc-unknown-aix -target-cpu pwr8 -ftls-model=local-exec -emit-llvm -o - | FileCheck %s -check-prefix=CHECK-LE
 // RUN: %clang_cc1 %s -triple powerpc64-unknown-aix -target-cpu pwr8 -emit-llvm -o - | FileCheck %s -check-prefix=CHECK-GD
 // RUN: %clang_cc1 %s -triple powerpc64-unknown-aix -target-cpu pwr8 -ftls-model=global-dynamic -emit-llvm -o - | FileCheck %s -check-prefix=CHECK-GD
 // RUN: not %clang_cc1 %s -triple powerpc64-unknown-aix -target-cpu pwr8 -ftls-model=local-dynamic -emit-llvm 2>&1 | FileCheck %s -check-prefix=CHECK-LD-ERROR
 // RUN: not %clang_cc1 %s -triple powerpc64-unknown-aix -target-cpu pwr8 -ftls-model=initial-exec -emit-llvm  2>&1 | FileCheck %s -check-prefix=CHECK-IE-ERROR
-// RUN: not %clang_cc1 %s -triple powerpc64-unknown-aix -target-cpu pwr8 -ftls-model=local-exec -emit-llvm 2>&1 | FileCheck %s -check-prefix=CHECK-LE-ERROR
+// RUN: %clang_cc1 %s -triple powerpc64-unknown-aix -target-cpu pwr8 -ftls-model=local-exec -emit-llvm -o - | FileCheck %s -check-prefix=CHECK-LE
 
 int z1 = 0;
 int z2;
@@ -23,4 +23,7 @@ int f() {
 // CHECK-GD: @_ZZ1fvE1y = internal thread_local global i32 0
 // CHECK-LD-ERROR:  error: TLS model 'local-dynamic' is not yet supported on AIX
 // CHECK-IE-ERROR:  error: TLS model 'initial-exec' is not yet supported on AIX
-// CHECK-LE-ERROR:  error: TLS model 'local-exec' is not yet supported on AIX
+// CHECK-LE: @z1 ={{.*}} global i32 0
+// CHECK-LE: @z2 ={{.*}} global i32 0
+// CHECK-LE: @x ={{.*}} thread_local(localexec) global i32 0
+// CHECK-LE: @_ZZ1fvE1y = internal thread_local(localexec) global i32 0
diff --git a/clang/test/Sema/aix-attr-tls_model.c b/clang/test/Sema/aix-attr-tls_model.c
index 8cf3086..245a443 100644
--- a/clang/test/Sema/aix-attr-tls_model.c
+++ b/clang/test/Sema/aix-attr-tls_model.c
@@ -8,4 +8,4 @@
 static __thread int y __attribute((tls_model("global-dynamic"))); // no-warning
 static __thread int y __attribute((tls_model("local-dynamic"))); // expected-error {{TLS model 'local-dynamic' is not yet supported on AIX}}
 static __thread int y __attribute((tls_model("initial-exec"))); // expected-error {{TLS model 'initial-exec' is not yet supported on AIX}}
-static __thread int y __attribute((tls_model("local-exec"))); // expected-error {{TLS model 'local-exec' is not yet supported on AIX}}
+static __thread int y __attribute((tls_model("local-exec"))); // no-warning