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#include <limits.h>
#include <mlibc/debug.hpp>
#define FMT(obj) format_object((obj), opts, formatter)
#define LOG_NAME_LOC(name, loc) "ubsan: " name " at " << loc << "\n "
#define LOG_LHS_RHS(lhs, rhs) "LHS = " << (lhs) << ", RHS = " << (rhs)
struct SourceLocation {
const char *filename;
uint32_t line;
uint32_t column;
};
template<class F>
void format_object(const SourceLocation &loc, frg::format_options opts, F &formatter) {
FMT(loc.filename);
FMT(":");
FMT(loc.line);
FMT(":");
FMT(loc.column);
}
using ValueHandle = uintptr_t;
struct TypeDescriptor {
enum class Kind : uint16_t {
Integer = 0x0000,
Float = 0x0001,
Unknown = 0xffff
} kind;
uint16_t info;
char name[];
unsigned bitWidthInt() const {
return 1 << (info >> 1);
}
bool isInlineInt() const {
if (kind != Kind::Integer)
return false;
auto inlineBits = sizeof(ValueHandle) * CHAR_BIT;
auto valueBits = bitWidthInt();
return inlineBits <= valueBits;
}
bool isSigned() const {
return info & 1;
}
};
template<class F>
void format_object(const TypeDescriptor &type, frg::format_options opts, F &formatter) {
FMT(type.name);
}
struct Value {
const TypeDescriptor &type;
ValueHandle val;
Value(const TypeDescriptor &type, ValueHandle val) : type(type), val(val) {}
};
template<class F>
void format_object(const Value &val, frg::format_options opts, F &formatter) {
if (val.type.isInlineInt() && val.type.isSigned()) {
auto signedValue = static_cast<int64_t>(val.val);
FMT(signedValue);
} else if (val.type.isInlineInt() && !val.type.isSigned()) {
auto unsignedValue = static_cast<uint64_t>(val.val);
FMT(unsignedValue);
}
FMT(" (");
FMT(val.type);
FMT(")");
}
// --- Hook implementations ---
struct TypeMismatch {
SourceLocation loc;
const TypeDescriptor &type;
unsigned char logAlignment;
unsigned char kind;
};
extern "C" [[gnu::visibility("hidden")]]
void __ubsan_handle_type_mismatch_v1(TypeMismatch *tm, ValueHandle pointer) {
// TODO: Make this print more information.
mlibc::panicLogger()
<< LOG_NAME_LOC("type mismatch", tm->loc)
<< "accessed address " << (void *)pointer << " but type "
<< tm->type << " requires alignment " << (1 << tm->logAlignment)
<< frg::endlog;
}
struct PointerOverflowData {
SourceLocation loc;
};
extern "C" [[gnu::visibility("hidden")]]
void __ubsan_handle_pointer_overflow(PointerOverflowData *pod, ValueHandle base, ValueHandle result) {
(void)base;
(void)result;
mlibc::panicLogger()
<< LOG_NAME_LOC("pointer overflow", pod->loc)
<< frg::endlog;
}
struct InvalidValueData {
SourceLocation loc;
const TypeDescriptor &type;
};
extern "C" [[gnu::visibility("hidden")]]
void __ubsan_handle_load_invalid_value(InvalidValueData *ivd, ValueHandle value) {
(void)value;
mlibc::panicLogger()
<< LOG_NAME_LOC("load of invalid value", ivd->loc)
<< frg::endlog;
}
struct OverflowData {
SourceLocation loc;
const TypeDescriptor &type;
};
extern "C" [[gnu::visibility("hidden")]]
void __ubsan_handle_add_overflow(OverflowData *od, ValueHandle lhs, ValueHandle rhs) {
mlibc::panicLogger()
<< LOG_NAME_LOC("add overflowed ", od->loc)
<< LOG_LHS_RHS(Value(od->type, lhs), Value(od->type, rhs))
<< frg::endlog;
}
extern "C" [[gnu::visibility("hidden")]]
void __ubsan_handle_sub_overflow(OverflowData *od, ValueHandle lhs, ValueHandle rhs) {
mlibc::panicLogger()
<< LOG_NAME_LOC("sub overflowed", od->loc)
<< LOG_LHS_RHS(Value(od->type, lhs), Value(od->type, rhs))
<< frg::endlog;
}
extern "C" [[gnu::visibility("hidden")]]
void __ubsan_handle_mul_overflow(OverflowData *od, ValueHandle lhs, ValueHandle rhs) {
mlibc::panicLogger()
<< LOG_NAME_LOC("mul overflowed", od->loc)
<< LOG_LHS_RHS(Value(od->type, lhs), Value(od->type, rhs))
<< frg::endlog;
}
extern "C" [[gnu::visibility("hidden")]]
void __ubsan_handle_divrem_overflow(OverflowData *od, ValueHandle lhs, ValueHandle rhs) {
mlibc::panicLogger()
<< LOG_NAME_LOC("divrem overflowed", od->loc)
<< LOG_LHS_RHS(Value(od->type, lhs), Value(od->type, rhs))
<< frg::endlog;
}
extern "C" [[gnu::visibility("hidden")]]
void __ubsan_handle_negate_overflow(OverflowData *od, ValueHandle lhs, ValueHandle rhs) {
mlibc::panicLogger()
<< LOG_NAME_LOC("negate overflowed", od->loc)
<< LOG_LHS_RHS(Value(od->type, lhs), Value(od->type, rhs))
<< frg::endlog;
}
struct ShiftOutOfBoundsData {
SourceLocation loc;
const TypeDescriptor &lhsType;
const TypeDescriptor &rhsType;
};
extern "C" [[gnu::visibility("hidden")]]
void __ubsan_handle_shift_out_of_bounds(ShiftOutOfBoundsData *soob, ValueHandle lhs, ValueHandle rhs) {
mlibc::panicLogger()
<< LOG_NAME_LOC("shift out of bounds", soob->loc)
<< LOG_LHS_RHS(Value(soob->lhsType, lhs), Value(soob->rhsType, rhs))
<< frg::endlog;
}
struct OutOfBoundsData {
SourceLocation loc;
const TypeDescriptor &arrayType;
const TypeDescriptor &indexType;
};
extern "C" [[gnu::visibility("hidden")]]
void __ubsan_handle_out_of_bounds(OutOfBoundsData *oobd, ValueHandle data) {
(void)data;
mlibc::panicLogger()
<< LOG_NAME_LOC("out of bounds access", oobd->loc)
<< frg::endlog;
}
struct UnreachableData {
SourceLocation loc;
};
extern "C" [[gnu::visibility("hidden")]]
void __ubsan_handle_builtin_unreachable(UnreachableData *ubd) {
mlibc::panicLogger()
<< LOG_NAME_LOC("reached __builtin_unreachable()", ubd->loc)
<< frg::endlog;
}
struct InvalidBuiltinData {
SourceLocation loc;
unsigned char kind;
};
extern "C" [[gnu::visibility("hidden")]]
void __ubsan_handle_invalid_builtin(InvalidBuiltinData *ibd) {
mlibc::panicLogger()
<< LOG_NAME_LOC("reached invalid builtin", ibd->loc)
<< frg::endlog;
}
struct VLABoundData {
SourceLocation loc;
const TypeDescriptor &type;
};
extern "C" [[gnu::visibility("hidden")]]
void __ubsan_handle_vla_bound_not_positive(VLABoundData *vlabd) {
mlibc::panicLogger()
<< LOG_NAME_LOC("VLA bound not positive", vlabd->loc)
<< frg::endlog;
}
extern "C" [[gnu::visibility("hidden")]]
void __ubsan_handle_missing_return(UnreachableData *data) {
mlibc::panicLogger()
<< LOG_NAME_LOC("reached end of a value-returning function without returning a value", data->loc)
<< frg::endlog;
}
struct NonNullArgData {
SourceLocation loc;
SourceLocation attr_loc;
int arg_index;
};
extern "C" [[gnu::visibility("hidden")]]
void __ubsan_handle_nonnull_arg(NonNullArgData *data) {
mlibc::panicLogger()
<< LOG_NAME_LOC("null pointer passed to non-null argument", data->loc)
<< "argument " << data->arg_index << " is required to be non-null in "
<< data->attr_loc << frg::endlog;
}
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