1 //===-- RegisterContextTest.cpp -------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "gtest/gtest.h"
10 
11 #include "Plugins/Process/Utility/RegisterContext_x86.h"
12 
13 #include "llvm/ADT/STLExtras.h"
14 #include "llvm/Support/FormatVariadic.h"
15 
16 #include <array>
17 
18 using namespace lldb_private;
19 
20 struct TagWordTestVector {
21   uint16_t sw;
22   uint16_t tw;
23   uint8_t tw_abridged;
24   int st_reg_num;
25 };
26 
27 constexpr MMSReg st_from_comp(uint64_t mantissa, uint16_t sign_exp) {
28   MMSReg ret = {};
29   ret.comp.mantissa = mantissa;
30   ret.comp.sign_exp = sign_exp;
31   return ret;
32 }
33 
34 const std::array<MMSReg, 8> st_regs = {
35     st_from_comp(0x8000000000000000, 0x4000), // +2.0
36     st_from_comp(0x3f00000000000000, 0x0000), // 1.654785e-4932
37     st_from_comp(0x0000000000000000, 0x0000), // +0
38     st_from_comp(0x0000000000000000, 0x8000), // -0
39     st_from_comp(0x8000000000000000, 0x7fff), // +inf
40     st_from_comp(0x8000000000000000, 0xffff), // -inf
41     st_from_comp(0xc000000000000000, 0xffff), // nan
42     st_from_comp(0x8000000000000000, 0xc000), // -2.0
43 };
44 
45 const std::array<TagWordTestVector, 8> tag_word_test_vectors{
46     TagWordTestVector{0x3800, 0x3fff, 0x80, 1},
47     TagWordTestVector{0x3000, 0x2fff, 0xc0, 2},
48     TagWordTestVector{0x2800, 0x27ff, 0xe0, 3},
49     TagWordTestVector{0x2000, 0x25ff, 0xf0, 4},
50     TagWordTestVector{0x1800, 0x25bf, 0xf8, 5},
51     TagWordTestVector{0x1000, 0x25af, 0xfc, 6},
52     TagWordTestVector{0x0800, 0x25ab, 0xfe, 7},
53     TagWordTestVector{0x0000, 0x25a8, 0xff, 8},
54 };
55 
56 TEST(RegisterContext_x86Test, AbridgedToFullTagWord) {
57   for (const auto &x : llvm::enumerate(tag_word_test_vectors)) {
58     SCOPED_TRACE(llvm::formatv("tag_word_test_vectors[{0}]", x.index()));
59     std::array<MMSReg, 8> test_regs;
60     for (int i = 0; i < x.value().st_reg_num; ++i)
61       test_regs[i] = st_regs[x.value().st_reg_num - i - 1];
62     EXPECT_EQ(
63         AbridgedToFullTagWord(x.value().tw_abridged, x.value().sw, test_regs),
64         x.value().tw);
65   }
66 }
67 
68 TEST(RegisterContext_x86Test, FullToAbridgedTagWord) {
69   for (const auto &x : llvm::enumerate(tag_word_test_vectors)) {
70     SCOPED_TRACE(llvm::formatv("tag_word_test_vectors[{0}]", x.index()));
71     EXPECT_EQ(FullToAbridgedTagWord(x.value().tw), x.value().tw_abridged);
72   }
73 }
74