aboutsummaryrefslogtreecommitdiff
path: root/lib/ubsan/ubsan_value.cc
diff options
context:
space:
mode:
Diffstat (limited to 'lib/ubsan/ubsan_value.cc')
-rw-r--r--lib/ubsan/ubsan_value.cc81
1 files changed, 81 insertions, 0 deletions
diff --git a/lib/ubsan/ubsan_value.cc b/lib/ubsan/ubsan_value.cc
new file mode 100644
index 000000000000..f17c58989db9
--- /dev/null
+++ b/lib/ubsan/ubsan_value.cc
@@ -0,0 +1,81 @@
+//===-- ubsan_value.cc ----------------------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Representation of a runtime value, as marshaled from the generated code to
+// the ubsan runtime.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ubsan_value.h"
+
+using namespace __ubsan;
+
+SIntMax Value::getSIntValue() const {
+ CHECK(getType().isSignedIntegerTy());
+ if (isInlineInt()) {
+ // Val was zero-extended to ValueHandle. Sign-extend from original width
+ // to SIntMax.
+ const unsigned ExtraBits =
+ sizeof(SIntMax) * 8 - getType().getIntegerBitWidth();
+ return SIntMax(Val) << ExtraBits >> ExtraBits;
+ }
+ if (getType().getIntegerBitWidth() == 64)
+ return *reinterpret_cast<s64*>(Val);
+#if HAVE_INT128_T
+ if (getType().getIntegerBitWidth() == 128)
+ return *reinterpret_cast<s128*>(Val);
+#else
+ if (getType().getIntegerBitWidth() == 128)
+ UNREACHABLE("libclang_rt.ubsan was built without __int128 support");
+#endif
+ UNREACHABLE("unexpected bit width");
+}
+
+UIntMax Value::getUIntValue() const {
+ CHECK(getType().isUnsignedIntegerTy());
+ if (isInlineInt())
+ return Val;
+ if (getType().getIntegerBitWidth() == 64)
+ return *reinterpret_cast<u64*>(Val);
+#if HAVE_INT128_T
+ if (getType().getIntegerBitWidth() == 128)
+ return *reinterpret_cast<u128*>(Val);
+#else
+ if (getType().getIntegerBitWidth() == 128)
+ UNREACHABLE("libclang_rt.ubsan was built without __int128 support");
+#endif
+ UNREACHABLE("unexpected bit width");
+}
+
+UIntMax Value::getPositiveIntValue() const {
+ if (getType().isUnsignedIntegerTy())
+ return getUIntValue();
+ SIntMax Val = getSIntValue();
+ CHECK(Val >= 0);
+ return Val;
+}
+
+/// Get the floating-point value of this object, extended to a long double.
+/// These are always passed by address (our calling convention doesn't allow
+/// them to be passed in floating-point registers, so this has little cost).
+FloatMax Value::getFloatValue() const {
+ CHECK(getType().isFloatTy());
+ switch (getType().getFloatBitWidth()) {
+#if 0
+ // FIXME: OpenCL / NEON 'half' type. LLVM can't lower the conversion
+ // from this to 'long double'.
+ case 16: return *reinterpret_cast<__fp16*>(Val);
+#endif
+ case 32: return *reinterpret_cast<float*>(Val);
+ case 64: return *reinterpret_cast<double*>(Val);
+ case 80: return *reinterpret_cast<long double*>(Val);
+ case 128: return *reinterpret_cast<long double*>(Val);
+ }
+ UNREACHABLE("unexpected floating point bit width");
+}