derek.holloway
7502bf64a4
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56 lines
2.1 KiB
C
56 lines
2.1 KiB
C
// RUN: %clang -target x86_64-linux-gnu -S -emit-llvm -o - %s | FileCheck -check-prefixes CHECK,WITHOUT %s
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// RUN: %clang -target x86_64-linux-gnu -S -emit-llvm -o - %s -fsanitize=thread | FileCheck -check-prefixes CHECK,TSAN %s
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// Instrumented function.
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// TSan inserts calls to __tsan_func_entry() and __tsan_func_exit() to prologue/epilogue.
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// Non-atomic loads are instrumented with __tsan_readXXX(), atomic loads - with
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// __tsan_atomicXXX_load().
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//
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// CHECK-LABEL: @instrumented1
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// TSAN: call void @__tsan_func_entry
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// WITHOUT-NOT: call void @__tsan_func_entry
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// TSAN: call void @__tsan_read4
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// WITHOUT-NOT: call void @__tsan_read4
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// TSAN: call i32 @__tsan_atomic32_load
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// WITHOUT-NOT: call i32 @__tsan_atomic32_load
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// TSAN: call void @__tsan_func_exit
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// WITHOUT-NOT: call void @__tsan_func_exit
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// CHECK: ret i32
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int instrumented1(int *a, _Atomic int *b) {
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return *a + *b;
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}
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// Function with no_sanitize("thread").
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// TSan only inserts instrumentation necessary to prevent false positives: calls are inserted for
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// function entry/exit and atomics, but not plain memory accesses.
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//
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// CHECK-LABEL: @no_false_positives1
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// TSAN: call void @__tsan_func_entry
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// WITHOUT-NOT: call void @__tsan_func_entry
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// TSAN-NOT: call void @__tsan_read4
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// WITHOUT-NOT: call void @__tsan_read4
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// TSAN: call i32 @__tsan_atomic32_load
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// WITHOUT-NOT: call i32 @__tsan_atomic32_load
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// TSAN: call void @__tsan_func_exit
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// WITHOUT-NOT: call void @__tsan_func_exit
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// CHECK: ret i32
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__attribute__((no_sanitize("thread"))) int no_false_positives1(int *a, _Atomic int *b) {
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return *a + *b;
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}
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// Function with disable_sanitizer_instrumentation: no instrumentation at all.
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//
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// CHECK-LABEL: @no_instrumentation1
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// TSAN-NOT: call void @__tsan_func_entry
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// WITHOUT-NOT: call void @__tsan_func_entry
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// TSAN-NOT: call void @__tsan_read4
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// WITHOUT-NOT: call void @__tsan_read4
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// TSAN-NOT: call i32 @__tsan_atomic32_load
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// WITHOUT-NOT: call i32 @__tsan_atomic32_load
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// TSAN-NOT: call void @__tsan_func_exit
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// WITHOUT-NOT: call void @__tsan_func_exit
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// CHECK: ret i32
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__attribute__((disable_sanitizer_instrumentation)) int no_instrumentation1(int *a, _Atomic int *b) {
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return *a + *b;
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}
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