forked from OSchip/llvm-project
72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -std=c++11 -Wuninitialized -verify %s
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// test1: Expect no diagnostics
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int test1(int x) {
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int y;
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asm goto("nop" : "=r"(y) : "r"(x) : : err);
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return y;
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err:
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return -1;
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}
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int test2(int x) {
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int y; // expected-warning {{variable 'y' is used uninitialized whenever its declaration is reached}} \
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// expected-note {{initialize the variable}}
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if (x < 42)
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asm volatile goto("testl %0, %0; testl %1, %2; jne %l3" : "+S"(x), "+D"(y) : "r"(x) :: indirect_1, indirect_2);
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else
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asm volatile goto("testl %0, %1; testl %2, %3; jne %l5" : "+S"(x), "+D"(y) : "r"(x), "r"(y) :: indirect_1, indirect_2);
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return x + y;
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indirect_1:
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return -42;
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indirect_2:
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return y; // expected-note {{uninitialized use occurs here}}
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}
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int test3(int x) {
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int y; // expected-warning {{variable 'y' is used uninitialized whenever its declaration is reached}} \
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// expected-note {{initialize the variable}}
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asm goto("xorl %1, %0; jmp %l2" : "=&r"(y) : "r"(x) : : fail);
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normal:
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y += x;
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return y;
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if (x) {
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fail:
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return y; // expected-note {{uninitialized use occurs here}}
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}
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return 0;
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}
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int test4(int x) {
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int y; // expected-warning {{variable 'y' is used uninitialized whenever its declaration is reached}} \
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// expected-note {{initialize the variable}}
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goto forward;
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backward:
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return y; // expected-note {{uninitialized use occurs here}}
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forward:
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asm goto("# %0 %1 %2" : "=r"(y) : "r"(x) : : backward);
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return y;
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}
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// test5: Expect no diagnostics
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int test5(int x) {
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int y;
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asm volatile goto("testl %0, %0; testl %1, %2; jne %l3" : "+S"(x), "+D"(y) : "r"(x) :: indirect, fallthrough);
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fallthrough:
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return y;
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indirect:
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return -2;
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}
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// test6: Expect no diagnostics.
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int test6(unsigned int *x) {
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unsigned int val;
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// See through casts and unary operators.
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asm goto("nop" : "=r" (*(unsigned int *)(&val)) ::: indirect);
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*x = val;
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return 0;
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indirect:
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return -1;
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}
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