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
st_from_comp(uint64_t mantissa,uint16_t sign_exp)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
TEST(RegisterContext_x86Test,AbridgedToFullTagWord)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
TEST(RegisterContext_x86Test,FullToAbridgedTagWord)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