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llvm-project/clang/test/CodeGenCXX/this-nonnull.cpp

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[CodeGen] Apply 'nonnull' and 'dereferenceable(N)' to 'this' pointer arguments. * Adds 'nonnull' and 'dereferenceable(N)' to 'this' pointer arguments * Gates 'nonnull' on -f(no-)delete-null-pointer-checks * Introduces this-nonnull.cpp and microsoft-abi-this-nullable.cpp tests to explicitly test the behavior of this change * Refactors hundreds of over-constrained clang tests to permit these attributes, where needed * Updates Clang12 patch notes mentioning this change Reviewed-by: rsmith, jdoerfert Differential Revision: https://reviews.llvm.org/D17993
2020-11-17 07:04:55 +08:00
// RUN: %clang_cc1 -S -emit-llvm -o - -triple=x86_64-linux-gnu %s | FileCheck %s -check-prefix=CHECK-YES
// RUN: %clang_cc1 -S -emit-llvm -o - -fno-delete-null-pointer-checks -triple=x86_64-linux-gnu %s | FileCheck %s -check-prefix=CHECK-NO
struct Struct {
int many;
int member;
int fields;
void ReturnsVoid();
};
void TestReturnsVoid(Struct &s) {
s.ReturnsVoid();
[Clang/Test]: Rename enable_noundef_analysis to disable-noundef-analysis and turn it off by default (2) This patch updates test files after D105169. Autogenerated test codes are changed by `utils/update_cc_test_checks.py,` and non-autogenerated test codes are changed as follows: (1) I wrote a python script that (partially) updates the tests using regex: {F18594904} The script is not perfect, but I believe it gives hints about which patterns are updated to have `noundef` attached. (2) The remaining tests are updated manually. Reviewed By: eugenis Differential Revision: https://reviews.llvm.org/D108453
2021-10-15 18:45:30 +08:00
// CHECK-YES: call void @_ZN6Struct11ReturnsVoidEv(%struct.Struct* noundef %0)
[CodeGen] -fno-delete-null-pointer-checks: change dereferenceable to dereferenceable_or_null After D17993, with -fno-delete-null-pointer-checks we add the dereferenceable attribute to the `this` pointer. We have observed that one internal target which worked before fails even with -fno-delete-null-pointer-checks. Switching to dereferenceable_or_null fixes the problem. dereferenceable currently does not always respect NullPointerIsValid and may imply nonnull and lead to aggressive optimization. The optimization may be related to `CallBase::isReturnNonNull`, `Argument::hasNonNullAttr`, or `Value::getPointerDereferenceableBytes`. See D66664 and D66618 for some discussions. Reviewed By: bkramer, rsmith Differential Revision: https://reviews.llvm.org/D92297
2020-12-01 04:44:35 +08:00
/// FIXME Use dereferenceable after dereferenceable respects NullPointerIsValid.
[Clang/Test]: Rename enable_noundef_analysis to disable-noundef-analysis and turn it off by default (2) This patch updates test files after D105169. Autogenerated test codes are changed by `utils/update_cc_test_checks.py,` and non-autogenerated test codes are changed as follows: (1) I wrote a python script that (partially) updates the tests using regex: {F18594904} The script is not perfect, but I believe it gives hints about which patterns are updated to have `noundef` attached. (2) The remaining tests are updated manually. Reviewed By: eugenis Differential Revision: https://reviews.llvm.org/D108453
2021-10-15 18:45:30 +08:00
// CHECK-NO: call void @_ZN6Struct11ReturnsVoidEv(%struct.Struct* noundef %0)
[CodeGen] Apply 'nonnull' and 'dereferenceable(N)' to 'this' pointer arguments. * Adds 'nonnull' and 'dereferenceable(N)' to 'this' pointer arguments * Gates 'nonnull' on -f(no-)delete-null-pointer-checks * Introduces this-nonnull.cpp and microsoft-abi-this-nullable.cpp tests to explicitly test the behavior of this change * Refactors hundreds of over-constrained clang tests to permit these attributes, where needed * Updates Clang12 patch notes mentioning this change Reviewed-by: rsmith, jdoerfert Differential Revision: https://reviews.llvm.org/D17993
2020-11-17 07:04:55 +08:00
}
[Clang/Test]: Rename enable_noundef_analysis to disable-noundef-analysis and turn it off by default (2) This patch updates test files after D105169. Autogenerated test codes are changed by `utils/update_cc_test_checks.py,` and non-autogenerated test codes are changed as follows: (1) I wrote a python script that (partially) updates the tests using regex: {F18594904} The script is not perfect, but I believe it gives hints about which patterns are updated to have `noundef` attached. (2) The remaining tests are updated manually. Reviewed By: eugenis Differential Revision: https://reviews.llvm.org/D108453
2021-10-15 18:45:30 +08:00
// CHECK-YES: declare void @_ZN6Struct11ReturnsVoidEv(%struct.Struct* noundef)
// CHECK-NO: declare void @_ZN6Struct11ReturnsVoidEv(%struct.Struct* noundef)