[clang] 7ebfcbd - Allow for custom code model in clang::Interpreter (#156977)

[via cfe-commits]

Author: Jeaye Wilkerson
Date: 2025-09-12T18:34:14+03:00
New Revision: 7ebfcbd0ec525810d3874b5826ac1cb53f14c6e4

URL: https://github.com/llvm/llvm-project/commit/7ebfcbd0ec525810d3874b5826ac1cb53f14c6e4
DIFF: https://github.com/llvm/llvm-project/commit/7ebfcbd0ec525810d3874b5826ac1cb53f14c6e4.diff

LOG: Allow for custom code model in clang::Interpreter (#156977)

This is necessary when using ASan, since the larger code size will lead
to errors such as:

```
JIT session error: In graph clojure_core-clojure.core$clojure_core_cpp_cast_24538-24543-jitted-objectbuffer, section .eh_frame: relocation target 0x7bffe374b000 (DW.ref.__gxx_personality_v0) is out of range of Delta32 fixup at address 0x7bffe374b000 (<anonymous block> @ 0x7fffebf48158 + 0x13)
```

Previously, `clang::Interpreter` would hard-code the usage of a small
code model. With this change, we default to small, but allow for custom
values. This related to #102858 and #135401.

There is no change to default behavior here.

@lhames for review.

Added: 
    

Modified: 
    clang/include/clang/Interpreter/Interpreter.h
    clang/lib/Interpreter/Interpreter.cpp

Removed: 
    


################################################################################
diff  --git a/clang/include/clang/Interpreter/Interpreter.h b/clang/include/clang/Interpreter/Interpreter.h
index 61af7bf762d5e..fcc270a17001e 100644
--- a/clang/include/clang/Interpreter/Interpreter.h
+++ b/clang/include/clang/Interpreter/Interpreter.h
@@ -135,11 +135,13 @@ class Interpreter {
     std::string OrcRuntimePath = "";
     /// PID of the out-of-process JIT executor.
     uint32_t ExecutorPID = 0;
+    /// An optional code model to provide to the JITTargetMachineBuilder
+    std::optional<llvm::CodeModel::Model> CM = std::nullopt;
 
     JITConfig()
         : IsOutOfProcess(false), OOPExecutor(""), OOPExecutorConnect(""),
           UseSharedMemory(false), SlabAllocateSize(0), OrcRuntimePath(""),
-          ExecutorPID(0) {}
+          ExecutorPID(0), CM(std::nullopt) {}
   };
 
 protected:

diff  --git a/clang/lib/Interpreter/Interpreter.cpp b/clang/lib/Interpreter/Interpreter.cpp
index 043e0c1e5754e..84f1c363b5f6f 100644
--- a/clang/lib/Interpreter/Interpreter.cpp
+++ b/clang/lib/Interpreter/Interpreter.cpp
@@ -647,6 +647,8 @@ llvm::Error Interpreter::CreateExecutor(JITConfig Config) {
     auto JTMB = createJITTargetMachineBuilder(TT);
     if (!JTMB)
       return JTMB.takeError();
+    if (Config.CM)
+      JTMB->setCodeModel(Config.CM);
     auto JB = IncrementalExecutor::createDefaultJITBuilder(std::move(*JTMB));
     if (!JB)
       return JB.takeError();