[Mlir-commits] [mlir] [mlir-tblgen] trim method body to empty with only spaces to avoid crash (PR #139568)
llvmlistbot at llvm.org
llvmlistbot at llvm.org
Mon May 12 08:54:05 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-mlir
Author: drazi (fengxie)
<details>
<summary>Changes</summary>
method body or default impl must be true empty. Even they contain only spaces, ``mlir-tblgen`` considers they are non-empty and generates invalid code lead to segment fault. It's very hard to debug.
```c++
InterfaceMethod<
...
/*methodBody=*/ [{ }], // This must be true empty. Leaving a space here can lead to segment fault which is hard to figure out why
/*defaultImpl=*/ [{
...
}]
```
This PR trim spaces when method body or default implementation of interface method is not empty. Now ``mlir-tblgen`` generates valid code even when they contain only spaces.
---
Full diff: https://github.com/llvm/llvm-project/pull/139568.diff
2 Files Affected:
- (modified) mlir/lib/TableGen/Interfaces.cpp (+6)
- (added) mlir/test/mlir-tblgen/method-body-with-only-spaces.td (+45)
``````````diff
diff --git a/mlir/lib/TableGen/Interfaces.cpp b/mlir/lib/TableGen/Interfaces.cpp
index a209b003b0f3b..9e9d4e4d3b13a 100644
--- a/mlir/lib/TableGen/Interfaces.cpp
+++ b/mlir/lib/TableGen/Interfaces.cpp
@@ -47,12 +47,18 @@ bool InterfaceMethod::isStatic() const {
// Return the body for this method if it has one.
std::optional<StringRef> InterfaceMethod::getBody() const {
auto value = def->getValueAsString("body");
+ // Trim leading and trailing spaces from the default implementation.
+ if (!value.empty())
+ value = value.trim();
return value.empty() ? std::optional<StringRef>() : value;
}
// Return the default implementation for this method if it has one.
std::optional<StringRef> InterfaceMethod::getDefaultImplementation() const {
auto value = def->getValueAsString("defaultBody");
+ // Trim leading and trailing spaces from the default implementation.
+ if (!value.empty())
+ value = value.trim();
return value.empty() ? std::optional<StringRef>() : value;
}
diff --git a/mlir/test/mlir-tblgen/method-body-with-only-spaces.td b/mlir/test/mlir-tblgen/method-body-with-only-spaces.td
new file mode 100644
index 0000000000000..daa0067e062d5
--- /dev/null
+++ b/mlir/test/mlir-tblgen/method-body-with-only-spaces.td
@@ -0,0 +1,45 @@
+// RUN: mlir-tblgen --gen-type-interface-decls -I %S/../../include %s | FileCheck %s
+
+include "mlir/IR/OpBase.td"
+
+def TestEmptyMethodBodyTypeInterface : TypeInterface<"TestEmptyMethodBodyTypeInterface"> {
+ let cppNamespace = "::TestEmptyMethodBodyTypeInterface";
+ let description = [{
+ Treat method body with only spaces as empty.
+ }];
+ let methods = [
+ InterfaceMethod<
+ /*desc=*/ [{ Trim spaces of method body and default implementation }],
+ /*returnType=*/ "StringRef",
+ /*methodName=*/ "trimSpaces",
+ /*args=*/ (ins),
+ // CHECK-LABEL: StringRef detail::TestEmptyMethodBodyTypeInterfaceInterfaceTraits::Model<ConcreteType>::trimSpaces
+ // CHECK-SAME: {
+ // CHECK-NEXT: return (::llvm::cast<ConcreteType>(tablegen_opaque_val)).trimSpaces();
+ // CHECK-NEXT: }
+ /*methodBody=*/ [{ }],
+ /*defaultImpl=*/ [{ return StringRef(); }]
+ >
+ ];
+}
+
+def TestEmptyDefaultImplTypeInterface : TypeInterface<"TestEmptyDefaultImplTypeInterface"> {
+ let cppNamespace = "::TestEmptyDefaultImplTypeInterface";
+ let description = [{
+ Treat default implementation with only spaces as empty.
+ }];
+
+ let methods = [
+ InterfaceMethod<
+ /*desc=*/ [{ Trim spaces of default implementation }],
+ /*returnType=*/ "StringRef",
+ /*methodName=*/ "trimSpaces",
+ /*args=*/ (ins),
+ /*methodBody=*/ [{ return StringRef(); }],
+ // COM: Don't generate default implementation
+ // CHECK-NOT: StringRef detail::TestEmptyDefaultImplTypeInterfaceInterfaceTraits::ExternalModel<ConcreteModel, ConcreteType>::trimSpaces
+ /*defaultImpl=*/ [{
+ }]
+ >
+ ];
+}
``````````
</details>
https://github.com/llvm/llvm-project/pull/139568
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