[clang] [RISCV] Emit predefined macro __riscv_cmodel_large for large code model (PR #108131)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Jim Lin (tclin914)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/108131.diff


5 Files Affected:

- (modified) clang/docs/ReleaseNotes.rst (+2) 
- (modified) clang/lib/Basic/Targets/RISCV.cpp (+2) 
- (modified) clang/lib/Driver/ToolChains/CommonArgs.cpp (+6-1) 
- (modified) clang/test/Driver/riscv-mcmodel.c (+9) 
- (modified) clang/test/Preprocessor/riscv-cmodel.c (+9) 


``````````diff
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 250821a9f9c45c..996dfcba0f35eb 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -455,6 +455,8 @@ LoongArch Support
 RISC-V Support
 ^^^^^^^^^^^^^^
 
+- The option ``-mcmodel=large`` for the large code model is supported.
+
 CUDA/HIP Language Changes
 ^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/clang/lib/Basic/Targets/RISCV.cpp b/clang/lib/Basic/Targets/RISCV.cpp
index 6f9d050fc71a90..223ac66b5f219d 100644
--- a/clang/lib/Basic/Targets/RISCV.cpp
+++ b/clang/lib/Basic/Targets/RISCV.cpp
@@ -146,6 +146,8 @@ void RISCVTargetInfo::getTargetDefines(const LangOptions &Opts,
     Builder.defineMacro("__riscv_cmodel_medlow");
   else if (CodeModel == "medium")
     Builder.defineMacro("__riscv_cmodel_medany");
+  else if (CodeModel == "large")
+    Builder.defineMacro("__riscv_cmodel_large");
 
   StringRef ABIName = getABI();
   if (ABIName == "ilp32f" || ABIName == "lp64f")
diff --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp b/clang/lib/Driver/ToolChains/CommonArgs.cpp
index 2ce6779f4b43e3..f58b816a9709dd 100644
--- a/clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -2902,11 +2902,16 @@ void tools::addMCModel(const Driver &D, const llvm::opt::ArgList &Args,
     } else if (Triple.isPPC64() || Triple.isOSAIX()) {
       Ok = CM == "small" || CM == "medium" || CM == "large";
     } else if (Triple.isRISCV()) {
+      // Large code model is disallowed to be used with PIC code model.
+      if (CM == "large" && RelocationModel != llvm::Reloc::Static)
+        D.Diag(diag::err_drv_argument_not_allowed_with)
+            << A->getAsString(Args) << "-fpic";
       if (CM == "medlow")
         CM = "small";
       else if (CM == "medany")
         CM = "medium";
-      Ok = CM == "small" || CM == "medium";
+      Ok = CM == "small" || CM == "medium" ||
+           (CM == "large" && Triple.isRISCV64());
     } else if (Triple.getArch() == llvm::Triple::x86_64) {
       Ok = llvm::is_contained({"small", "kernel", "medium", "large", "tiny"},
                               CM);
diff --git a/clang/test/Driver/riscv-mcmodel.c b/clang/test/Driver/riscv-mcmodel.c
index 4f5fa95f59b666..c27d7c63a75a4f 100644
--- a/clang/test/Driver/riscv-mcmodel.c
+++ b/clang/test/Driver/riscv-mcmodel.c
@@ -10,5 +10,14 @@
 // RUN: %clang --target=riscv32 -### -c -mcmodel=medany %s 2>&1 | FileCheck --check-prefix=MEDIUM %s
 // RUN: %clang --target=riscv64 -### -c -mcmodel=medany %s 2>&1 | FileCheck --check-prefix=MEDIUM %s
 
+// RUN: not %clang --target=riscv32 -### -c -mcmodel=large %s 2>&1 | FileCheck --check-prefix=ERR-LARGE %s
+// RUN: %clang --target=riscv64 -### -c -mcmodel=large %s 2>&1 | FileCheck --check-prefix=LARGE %s
+
+// RUN: not %clang --target=riscv64 -### -c -mcmodel=large -fpic %s 2>&1 | FileCheck --check-prefix=LARGE %s
+
 // SMALL: "-mcmodel=small"
 // MEDIUM: "-mcmodel=medium"
+// LARGE: "-mcmodel=large"
+
+// ERR-LARGE:  error: unsupported argument 'large' to option '-mcmodel=' for target 'riscv32'
+// ERR-PIC-LARGE:  error: invalid argument '-mcmodel=large' not allowed with '-fpic'
diff --git a/clang/test/Preprocessor/riscv-cmodel.c b/clang/test/Preprocessor/riscv-cmodel.c
index 45b9a93de6f78a..bd9aa23f5d5e27 100644
--- a/clang/test/Preprocessor/riscv-cmodel.c
+++ b/clang/test/Preprocessor/riscv-cmodel.c
@@ -15,6 +15,7 @@
 
 // CHECK-MEDLOW: #define __riscv_cmodel_medlow 1
 // CHECK-MEDLOW-NOT: __riscv_cmodel_medany
+// CHECK-MEDLOW-NOT: __riscv_cmodel_large
 
 // RUN: %clang --target=riscv32-unknown-linux-gnu -march=rv32i -x c -E -dM %s \
 // RUN: -mcmodel=medium -o - | FileCheck --check-prefix=CHECK-MEDANY %s
@@ -28,3 +29,11 @@
 
 // CHECK-MEDANY: #define __riscv_cmodel_medany 1
 // CHECK-MEDANY-NOT: __riscv_cmodel_medlow
+// CHECK-MEDANY-NOT: __riscv_cmodel_large
+
+// RUN: %clang --target=riscv64-unknown-linux-gnu -march=rv64i -x c -E -dM %s \
+// RUN: -mcmodel=large -o - | FileCheck --check-prefix=CHECK-LARGE %s
+
+// CHECK-LARGE: #define __riscv_cmodel_large 1
+// CHECK-LARGE-NOT: __riscv_cmodel_medlow
+// CHECK-LARGE-NOT: __riscv_cmodel_medany

``````````

</details>


https://github.com/llvm/llvm-project/pull/108131