59 lines · cpp
1// RUN: %clang_analyze_cc1 %s \2// RUN: -analyzer-checker=core \3// RUN: -analyzer-checker=debug.ExprInspection \4// RUN: -analyzer-config support-symbolic-integer-casts=true \5// RUN: -analyzer-config eagerly-assume=false \6// RUN: -triple x86_64-unknown-linux-gnu \7// RUN: -verify8 9// Test that the SValBuilder is able to look up and use a constraint for an10// operand of a SymbolCast, when the operand is constrained to a const value.11 12void clang_analyzer_eval(bool);13 14extern void abort() __attribute__((__noreturn__));15#define assert(expr) ((expr) ? (void)(0) : abort())16 17void test(int x) {18 // Constrain a SymSymExpr to a constant value.19 assert(x * x == 1);20 // It is expected to be able to get the constraint for the operand of the21 // cast.22 clang_analyzer_eval((char)(x * x) == 1); // expected-warning{{TRUE}}23 clang_analyzer_eval((long)(x * x) == 1); // expected-warning{{TRUE}}24}25 26void test1(int x, int y) {27 // Even if two lower bytes of `x` equal to zero, it doesn't mean that28 // the entire `x` is zero. We are not able to know the exact value of x.29 // It can be one of 65536 possible values like30 // [0, 65536, -65536, 131072, -131072, ...]. To avoid huge range sets we31 // still assume `x` in the range [INT_MIN, INT_MAX].32 assert((short)x == 0); // Lower two bytes are set to 0.33 34 static_assert((short)65536 == 0, "");35 static_assert((short)-65536 == 0, "");36 static_assert((short)131072 == 0, "");37 static_assert((short)-131072 == 0, "");38 clang_analyzer_eval(x == 0); // expected-warning{{UNKNOWN}}39 40 // These are not truncated to short as zero.41 static_assert((short)1 != 0, "");42 clang_analyzer_eval(x == 1); // expected-warning{{FALSE}}43 static_assert((short)-1 != 0, "");44 clang_analyzer_eval(x == -1); // expected-warning{{FALSE}}45 static_assert((short)65537 != 0, "");46 clang_analyzer_eval(x == 65537); // expected-warning{{FALSE}}47 static_assert((short)-65537 != 0, "");48 clang_analyzer_eval(x == -65537); // expected-warning{{FALSE}}49 static_assert((short)131073 != 0, "");50 clang_analyzer_eval(x == 131073); // expected-warning{{FALSE}}51 static_assert((short)-131073 != 0, "");52 clang_analyzer_eval(x == -131073); // expected-warning{{FALSE}}53 54 // Check for implicit cast.55 short s = y;56 assert(s == 0);57 clang_analyzer_eval(y == 0); // expected-warning{{UNKNOWN}}58}59