diff options
Diffstat (limited to 'test/Analysis/dead-stores.c')
| -rw-r--r-- | test/Analysis/dead-stores.c | 68 |
1 files changed, 55 insertions, 13 deletions
diff --git a/test/Analysis/dead-stores.c b/test/Analysis/dead-stores.c index 57d5d112d717..7fc0f0464d72 100644 --- a/test/Analysis/dead-stores.c +++ b/test/Analysis/dead-stores.c @@ -1,8 +1,8 @@ -// RUN: %clang_cc1 -Wunused-variable -analyze -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-check-dead-stores -fblocks -verify -Wno-unreachable-code -analyzer-opt-analyze-nested-blocks %s -// RUN: %clang_cc1 -Wunused-variable -analyze -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-store=basic -analyzer-constraints=basic -analyzer-check-dead-stores -fblocks -verify -Wno-unreachable-code -analyzer-opt-analyze-nested-blocks %s -// RUN: %clang_cc1 -Wunused-variable -analyze -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-store=basic -analyzer-constraints=range -analyzer-check-dead-stores -fblocks -verify -Wno-unreachable-code -analyzer-opt-analyze-nested-blocks %s -// RUN: %clang_cc1 -Wunused-variable -analyze -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-store=region -analyzer-constraints=basic -analyzer-check-dead-stores -fblocks -verify -Wno-unreachable-code -analyzer-opt-analyze-nested-blocks %s -// RUN: %clang_cc1 -Wunused-variable -analyze -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-store=region -analyzer-constraints=range -analyzer-check-dead-stores -fblocks -verify -Wno-unreachable-code -analyzer-opt-analyze-nested-blocks %s +// RUN: %clang_cc1 -Wunused-variable -analyze -analyzer-checker=core.experimental.IdempotentOps -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-checker=core.DeadStores -fblocks -verify -Wno-unreachable-code -analyzer-opt-analyze-nested-blocks %s +// RUN: %clang_cc1 -Wunused-variable -analyze -analyzer-checker=core.experimental.IdempotentOps -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-store=basic -analyzer-constraints=basic -analyzer-checker=core.DeadStores -fblocks -verify -Wno-unreachable-code -analyzer-opt-analyze-nested-blocks %s +// RUN: %clang_cc1 -Wunused-variable -analyze -analyzer-checker=core.experimental.IdempotentOps -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-store=basic -analyzer-constraints=range -analyzer-checker=core.DeadStores -fblocks -verify -Wno-unreachable-code -analyzer-opt-analyze-nested-blocks %s +// RUN: %clang_cc1 -Wunused-variable -analyze -analyzer-checker=core.experimental.IdempotentOps -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-store=region -analyzer-constraints=basic -analyzer-checker=core.DeadStores -fblocks -verify -Wno-unreachable-code -analyzer-opt-analyze-nested-blocks %s +// RUN: %clang_cc1 -Wunused-variable -analyze -analyzer-checker=core.experimental.IdempotentOps -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-store=region -analyzer-constraints=range -analyzer-checker=core.DeadStores -fblocks -verify -Wno-unreachable-code -analyzer-opt-analyze-nested-blocks %s void f1() { int k, y; // expected-warning{{unused variable 'k'}} expected-warning{{unused variable 'y'}} @@ -13,7 +13,7 @@ void f1() { void f2(void *b) { char *c = (char*)b; // no-warning char *d = b+1; // expected-warning {{never read}} expected-warning{{unused variable 'd'}} - printf("%s", c); // expected-warning{{implicitly declaring C library function 'printf' with type 'int (char const *, ...)'}} \ + printf("%s", c); // expected-warning{{implicitly declaring C library function 'printf' with type 'int (const char *, ...)'}} \ // expected-note{{please include the header <stdio.h> or explicitly provide a declaration for 'printf'}} } @@ -44,10 +44,11 @@ void f5() { } +// int f6() { int x = 4; - ++x; // expected-warning{{never read}} + ++x; // no-warning return 1; } @@ -75,9 +76,11 @@ int f7d(int *p) { return 1; } +// Don't warn for dead stores in nested expressions. We have yet +// to see a real bug in this scenario. int f8(int *p) { extern int *baz(); - if ((p = baz())) // expected-warning{{Although the value}} + if ((p = baz())) // no-warning return 1; return 0; } @@ -148,9 +151,11 @@ void f15(unsigned x, unsigned y) { int z[count]; // expected-warning{{unused variable 'z'}} } +// Don't warn for dead stores in nested expressions. We have yet +// to see a real bug in this scenario. int f16(int x) { x = x * 2; - x = sizeof(int [x = (x || x + 1) * 2]) // expected-warning{{Although the value stored to 'x' is used}} expected-warning{{The left operand to '*' is always 1}} + x = sizeof(int [x = (x || x + 1) * 2]) // expected-warning{{The left operand to '+' is always 0}} expected-warning{{The left operand to '*' is always 1}} ? 5 : 8; return x; } @@ -171,11 +176,35 @@ int f18() { x = 10; // expected-warning{{Value stored to 'x' is never read}} while (1) x = 10; // expected-warning{{Value stored to 'x' is never read}} + // unreachable. do - x = 10; // expected-warning{{Value stored to 'x' is never read}} + x = 10; // no-warning while (1); + return (x = 10); // no-warning +} + +int f18_a() { + int x = 0; // no-warning + return (x = 10); // no-warning +} + +void f18_b() { + int x = 0; // no-warning + if (1) + x = 10; // expected-warning{{Value stored to 'x' is never read}} +} + +void f18_c() { + int x = 0; + while (1) + x = 10; // expected-warning{{Value stored to 'x' is never read}} +} - return (x = 10); // expected-warning{{Although the value stored to 'x' is used in the enclosing expression, the value is never actually read from 'x'}} +void f18_d() { + int x = 0; // no-warning + do + x = 10; // expected-warning{{Value stored to 'x' is never read}} + while (1); } // PR 3514: false positive `dead initialization` warning for init to global @@ -203,7 +232,7 @@ void halt() __attribute__((noreturn)); int f21() { int x = 4; - ++x; // expected-warning{{never read}} + x = x + 1; // expected-warning{{never read}} if (1) { halt(); (void)x; @@ -235,7 +264,7 @@ void f22() { int y19 = 4; int y20 = 4; - ++x; // expected-warning{{never read}} + x = x + 1; // expected-warning{{never read}} ++y1; ++y2; ++y3; @@ -486,3 +515,16 @@ void rdar8320674(s_rdar8320674 *z, unsigned y, s2_rdar8320674 *st, int m) }while (--m); } +// Avoid dead stores resulting from an assignment (and use) being unreachable. +void rdar8405222_aux(int i); +void rdar8405222() { + const int show = 0; + int i = 0; + + if (show) + i = 5; // no-warning + + if (show) + rdar8405222_aux(i); +} + |