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llvm-project/clang/test/CodeGen/sanitize-atomic-int-overflow.c

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[CodeGen] Fix some broken IR generated by -fsanitize=unsigned-integer-overflow I think the author of the function assumed that `GetInsertBlock()` wouldn't change from where `atomicPHI` was created, but this isn't true when `-fsanitize=unsigned-integer-overflow` is enabled (we generate an overflow/continuation label). Fix by keeping track of the block we want to return to to complete the cmpxchg loop. rdar://48406558 Differential revision: https://reviews.llvm.org/D58744 llvm-svn: 355054
2019-02-28 08:47:55 +08:00
// RUN: %clang_cc1 -triple x86_64-apple-macosx10.14.0 -fsanitize=unsigned-integer-overflow %s -emit-llvm -o - | FileCheck %s
_Atomic(unsigned) atomic;
[test] Add {{.*}} to make tests immune to dso_local/dso_preemptable/(none) differences For a definition (of most linkage types), dso_local is set for ELF -fno-pic/-fpie and COFF, but not for Mach-O. This nuance causes unneeded binary format differences. This patch replaces (function) `define ` with `define{{.*}} `, (variable/constant/alias) `= ` with `={{.*}} `, or inserts appropriate `{{.*}} ` if there is an explicit linkage. * Clang will set dso_local for Mach-O, which is currently implied by TargetMachine.cpp. This will make COFF/Mach-O and executable ELF similar. * Eventually I hope we can make dso_local the textual LLVM IR default (write explicit "dso_preemptable" when applicable) and -fpic ELF will be similar to everything else. This patch helps move toward that goal.
2020-12-31 12:45:56 +08:00
// CHECK-LABEL: define{{.*}} void @cmpd_assign
Use functions with prototypes when appropriate; NFC A significant number of our tests in C accidentally use functions without prototypes. This patch converts the function signatures to have a prototype for the situations where the test is not specific to K&R C declarations. e.g., void func(); becomes void func(void); This is the eleventh batch of tests being updated (there are a significant number of other tests left to be updated).
2022-02-16 05:06:01 +08:00
void cmpd_assign(void) {
[CodeGen] Fix some broken IR generated by -fsanitize=unsigned-integer-overflow I think the author of the function assumed that `GetInsertBlock()` wouldn't change from where `atomicPHI` was created, but this isn't true when `-fsanitize=unsigned-integer-overflow` is enabled (we generate an overflow/continuation label). Fix by keeping track of the block we want to return to to complete the cmpxchg loop. rdar://48406558 Differential revision: https://reviews.llvm.org/D58744 llvm-svn: 355054
2019-02-28 08:47:55 +08:00
// CHECK: br label %[[LOOP_START:.*]]
// CHECK: [[LOOP_START]]:
// CHECK-NEXT: phi i32 {{.*}}, [ {{.*}}, %[[INCOMING_BLOCK:.*]] ]
// CHECK: [[INCOMING_BLOCK]]:
// CHECK-NEXT: cmpxchg
// CHECK-NEXT: extractvalue
// CHECK-NEXT: extractvalue
// CHECK-NEXT: br i1 %8, label %{{.*}}, label %[[LOOP_START]]
atomic += 1;
}
[test] Add {{.*}} to make tests immune to dso_local/dso_preemptable/(none) differences For a definition (of most linkage types), dso_local is set for ELF -fno-pic/-fpie and COFF, but not for Mach-O. This nuance causes unneeded binary format differences. This patch replaces (function) `define ` with `define{{.*}} `, (variable/constant/alias) `= ` with `={{.*}} `, or inserts appropriate `{{.*}} ` if there is an explicit linkage. * Clang will set dso_local for Mach-O, which is currently implied by TargetMachine.cpp. This will make COFF/Mach-O and executable ELF similar. * Eventually I hope we can make dso_local the textual LLVM IR default (write explicit "dso_preemptable" when applicable) and -fpic ELF will be similar to everything else. This patch helps move toward that goal.
2020-12-31 12:45:56 +08:00
// CHECK-LABEL: define{{.*}} void @inc
Use functions with prototypes when appropriate; NFC A significant number of our tests in C accidentally use functions without prototypes. This patch converts the function signatures to have a prototype for the situations where the test is not specific to K&R C declarations. e.g., void func(); becomes void func(void); This is the eleventh batch of tests being updated (there are a significant number of other tests left to be updated).
2022-02-16 05:06:01 +08:00
void inc(void) {
[CodeGen] Fix some broken IR generated by -fsanitize=unsigned-integer-overflow I think the author of the function assumed that `GetInsertBlock()` wouldn't change from where `atomicPHI` was created, but this isn't true when `-fsanitize=unsigned-integer-overflow` is enabled (we generate an overflow/continuation label). Fix by keeping track of the block we want to return to to complete the cmpxchg loop. rdar://48406558 Differential revision: https://reviews.llvm.org/D58744 llvm-svn: 355054
2019-02-28 08:47:55 +08:00
// CHECK: br label %[[LOOP_START:.*]]
// CHECK: [[LOOP_START]]:
// CHECK-NEXT: phi i32 {{.*}}, [ {{.*}}, %[[INCOMING_BLOCK:.*]] ]
// CHECK: [[INCOMING_BLOCK]]:
// CHECK-NEXT: cmpxchg
// CHECK-NEXT: extractvalue
// CHECK-NEXT: extractvalue
// CHECK-NEXT: br i1 %8, label %{{.*}}, label %[[LOOP_START]]
atomic++;
}