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tests/lint: add test case for integer non-constant expression 

Seen in sqlite3.c.
This commit is contained in:
rillig 2022-04-19 22:40:13 +00:00
parent 881239103e
commit 5242bed266
2 changed files with 17 additions and 1 deletions
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17
tests/usr.bin/xlint/lint1/msg_132.c
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@ -1,4 +1,4 @@
/* $NetBSD: msg_132.c,v 1.6 2021/08/25 22:04:52 rillig Exp $ */
/* $NetBSD: msg_132.c,v 1.7 2022/04/19 22:40:13 rillig Exp $ */
# 3 "msg_132.c"
// Test for message: conversion from '%s' to '%s' may lose accuracy [132]
@ -85,3 +85,18 @@ cover_build_plus_minus(const char *arr, double idx)
return arr + idx;
return arr + (unsigned int)idx;
}
int
non_constant_expression(void)
{
/*
* Even though this variable definition looks like a constant, it
* does not fall within C's definition of an integer constant
* expression. Due to that, lint does not perform constant folding
* on the expression built from this variable and thus doesn't know
* that the conversion will always succeed.
*/
const int not_a_constant = 8;
/* expect+1: warning: conversion from 'unsigned long' to 'int' may lose accuracy [132] */
return sizeof(double) + not_a_constant * sizeof(char *);
}

1
tests/usr.bin/xlint/lint1/msg_132.exp
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@ -12,3 +12,4 @@ msg_132.c(55): warning: conversion from 'long long' to 'short' may lose accuracy
msg_132.c(59): warning: conversion from 'long long' to 'int' may lose accuracy [132]
msg_132.c(85): error: operands of '+' have incompatible types (pointer != double) [107]
msg_132.c(85): warning: function 'cover_build_plus_minus' expects to return value [214]
msg_132.c(101): warning: conversion from 'unsigned long' to 'int' may lose accuracy [132]