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use -fsanitize=undefined for C code in safe build modes

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closes #3569
This commit is contained in:
Andrew Kelley 2019-10-31 17:24:22 -04:00
parent cb5a5ebb20
commit f8cd981c04
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GPG Key ID: 7C5F548F728501A9
2 changed files with 13 additions and 2 deletions
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9
lib/std/debug.zig
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@ -2404,6 +2404,7 @@ pub fn attachSegfaultHandler() void {
};
os.sigaction(os.SIGSEGV, &act, null);
os.sigaction(os.SIGILL, &act, null);
}
fn resetSegfaultHandler() void {
@ -2420,6 +2421,7 @@ fn resetSegfaultHandler() void {
.flags = 0,
};
os.sigaction(os.SIGSEGV, &act, null);
os.sigaction(os.SIGILL, &act, null);
}
extern fn handleSegfaultLinux(sig: i32, info: *const os.siginfo_t, ctx_ptr: *const c_void) noreturn {
@ -2429,8 +2431,11 @@ extern fn handleSegfaultLinux(sig: i32, info: *const os.siginfo_t, ctx_ptr: *con
resetSegfaultHandler();
const addr = @ptrToInt(info.fields.sigfault.addr);
std.debug.warn("Segmentation fault at address 0x{x}\n", .{addr});
switch (sig) {
os.SIGSEGV => std.debug.warn("Segmentation fault at address 0x{x}\n", .{addr}),
os.SIGILL => std.debug.warn("Illegal instruction at address 0x{x}\n", .{addr}),
else => unreachable,
}
switch (builtin.arch) {
.i386 => {
const ctx = @ptrCast(*const os.ucontext_t, @alignCast(@alignOf(os.ucontext_t), ctx_ptr));

6
src/codegen.cpp
View File

@ -8973,6 +8973,9 @@ void add_cc_args(CodeGen *g, ZigList<const char *> &args, const char *out_dep_pa
switch (g->build_mode) {
case BuildModeDebug:
args.append("-fsanitize=undefined");
args.append("-fsanitize-trap=undefined");
// windows c runtime requires -D_DEBUG if using debug libraries
args.append("-D_DEBUG");
@ -8985,6 +8988,9 @@ void add_cc_args(CodeGen *g, ZigList<const char *> &args, const char *out_dep_pa
}
break;
case BuildModeSafeRelease:
args.append("-fsanitize=undefined");
args.append("-fsanitize-trap=undefined");
// See the comment in the BuildModeFastRelease case for why we pass -O2 rather
// than -O3 here.
args.append("-O2");