140bfdca60
Follow up fix to
commit 2240d72f15f3 ("[X86] initial -mfunction-return=thunk-extern
support")
https://reviews.llvm.org/D129572
@nathanchance reported that -mfunction-return=thunk-extern was failing
to annotate the asan and tsan contructors.
https://lore.kernel.org/llvm/Ys7pLq+tQk5xEa%2FB@dev-arch.thelio-3990X/
I then noticed the same occurring for gcov synthetic functions.
Similar to
commit 2786e67 ("[IR][sanitizer] Add module flag "frame-pointer" and set
it for cc1 -mframe-pointer={non-leaf,all}")
define a new module level MetaData, "fn_ret_thunk_extern", then when set
adds the fn_ret_thunk_extern IR Fn Attr to synthetically created
Functions.
Fixes https://github.com/llvm/llvm-project/issues/56514
Reviewed By: MaskRay
Differential Revision: https://reviews.llvm.org/D129709
117 lines
4.6 KiB
C
117 lines
4.6 KiB
C
// RUN: %clang_cc1 -std=gnu2x -triple x86_64-linux-gnu %s -emit-llvm -o - \
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// RUN: -Werror=ignored-attributes \
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// RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-NOM
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// RUN: %clang_cc1 -std=gnu2x -triple x86_64-linux-gnu %s -emit-llvm -o - \
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// RUN: -Werror=ignored-attributes -mfunction-return=keep \
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// RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-KEEP
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// RUN: %clang_cc1 -std=gnu2x -triple x86_64-linux-gnu %s -emit-llvm -o - \
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// RUN: -Werror=ignored-attributes -mfunction-return=thunk-extern \
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// RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-EXTERN
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// RUN: %clang_cc1 -std=gnu2x -triple x86_64-linux-gnu %s -emit-llvm -o - \
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// RUN: -mfunction-return=thunk-extern -fprofile-arcs \
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// RUN: | FileCheck %s --check-prefix=CHECK-GCOV
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// RUN: %clang_cc1 -std=gnu2x -triple x86_64-linux-gnu %s -emit-llvm -o - \
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// RUN: -mfunction-return=thunk-extern -fsanitize=address \
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// RUN: | FileCheck %s --check-prefix=CHECK-ASAN
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// RUN: %clang_cc1 -std=gnu2x -triple x86_64-linux-gnu %s -emit-llvm -o - \
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// RUN: -mfunction-return=thunk-extern -fsanitize=thread \
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// RUN: | FileCheck %s --check-prefix=CHECK-TSAN
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#if !__has_attribute(function_return)
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#error "missing attribute support for function_return"
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#endif
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// CHECK: @keep() [[KEEP:#[0-9]+]]
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__attribute__((function_return("keep"))) void keep(void) {}
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// CHECK: @keep2() [[KEEP]]
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[[gnu::function_return("keep")]] void keep2(void) {}
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// CHECK: @thunk_extern() [[EXTERN:#[0-9]+]]
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__attribute__((function_return("thunk-extern"))) void thunk_extern(void) {}
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// CHECK: @thunk_extern2() [[EXTERN]]
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[[gnu::function_return("thunk-extern")]] void thunk_extern2(void) {}
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// CHECK: @double_thunk_keep() [[KEEP]]
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// clang-format off
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__attribute__((function_return("thunk-extern")))
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__attribute__((function_return("keep")))
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void double_thunk_keep(void) {}
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// CHECK: @double_thunk_keep2() [[KEEP]]
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[[gnu::function_return("thunk-extern")]][[gnu::function_return("keep")]]
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void double_thunk_keep2(void) {}
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// CHECK: @double_keep_thunk() [[EXTERN]]
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__attribute__((function_return("keep")))
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__attribute__((function_return("thunk-extern")))
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void double_keep_thunk(void) {}
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// CHECK: @double_keep_thunk2() [[EXTERN]]
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[[gnu::function_return("keep")]][[gnu::function_return("thunk-extern")]]
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void double_keep_thunk2(void) {}
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// CHECK: @thunk_keep() [[KEEP]]
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__attribute__((function_return("thunk-extern"), function_return("keep")))
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void thunk_keep(void) {}
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// CHECK: @thunk_keep2() [[KEEP]]
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[[gnu::function_return("thunk-extern"), gnu::function_return("keep")]]
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void thunk_keep2(void) {}
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// CHECK: @keep_thunk() [[EXTERN]]
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__attribute__((function_return("keep"), function_return("thunk-extern")))
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void keep_thunk(void) {}
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// CHECK: @keep_thunk2() [[EXTERN]]
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[[gnu::function_return("keep"), gnu::function_return("thunk-extern")]]
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void keep_thunk2(void) {}
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// clang-format on
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void undef(void);
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// CHECK: @undef() [[KEEP]]
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__attribute__((function_return("keep"))) void undef(void) {}
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void undef2(void);
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// CHECK: @undef2() [[EXTERN]]
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__attribute__((function_return("thunk-extern"))) void undef2(void) {}
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__attribute__((function_return("thunk-extern"))) void change_def(void);
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// CHECK: @change_def() [[KEEP]]
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__attribute__((function_return("keep"))) void change_def(void) {}
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__attribute__((function_return("keep"))) void change_def2(void);
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// CHECK: @change_def2() [[EXTERN]]
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__attribute__((function_return("thunk-extern"))) void change_def2(void) {}
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__attribute__((function_return("thunk-extern"))) void change_def3(void);
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// CHECK: @change_def3() [[KEEP]]
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[[gnu::function_return("keep")]] void change_def3(void) {}
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[[gnu::function_return("keep")]] void change_def4(void);
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// CHECK: @change_def4() [[EXTERN]]
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__attribute__((function_return("thunk-extern"))) void change_def4(void) {}
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// When there is no -mfunction-return= flag set (NOM) or it's set to keep,
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// we don't emit anything into the IR for unattributed functions.
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// CHECK-NOM: @no_attrs() [[NOATTR:#[0-9]+]]
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// CHECK-KEEP: @no_attrs() [[NOATTR:#[0-9]+]]
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// CHECK-EXTERN: @no_attrs() [[EXTERN]]
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void no_attrs(void) {}
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// Test synthetic functions.
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// CHECK-GCOV: @__llvm_gcov_writeout() unnamed_addr [[EXTERNGCOV:#[0-9]+]]
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// CHECK-GCOV: @__llvm_gcov_reset() unnamed_addr [[EXTERNGCOV]]
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// CHECK-GCOV: @__llvm_gcov_init() unnamed_addr [[EXTERNGCOV]]
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// CHECK-ASAN: @asan.module_ctor() [[EXTERNASAN:#[0-9]+]]
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// CHECK-TSAN: @tsan.module_ctor() [[EXTERNTSAN:#[0-9]+]]
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// CHECK-NOM-NOT: [[NOATTR]] = {{.*}}fn_ret_thunk_extern
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// CHECK-KEEP-NOT: [[NOATTR]] = {{.*}}fn_ret_thunk_extern
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// CHECK: [[EXTERN]] = {{.*}}fn_ret_thunk_extern
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// CHECK-GCOV: [[EXTERNGCOV]] = {{.*}}fn_ret_thunk_extern
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// CHECK-ASAN: [[EXTERNASAN]] = {{.*}}fn_ret_thunk_extern
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// CHECK-TSAN: [[EXTERNTSAN]] = {{.*}}fn_ret_thunk_extern
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