1 // Copyright 2016 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "src/eh-frame.h" 6 #include "src/objects.h" 7 #include "test/cctest/cctest.h" 8 9 using namespace v8::internal; 10 11 TEST(EhFrameHdr) { 12 CcTest::InitializeVM(); 13 HandleScope handle_scope(CcTest::i_isolate()); 14 15 // The content is not relevant in this test 16 byte buffer[10] = {0}; 17 byte unwinding_info[30 + EhFrameHdr::kRecordSize] = {0}; 18 19 CodeDesc code_desc; 20 code_desc.buffer = &buffer[0]; 21 code_desc.buffer_size = sizeof(buffer); 22 code_desc.constant_pool_size = 0; 23 code_desc.instr_size = sizeof(buffer); 24 code_desc.reloc_size = 0; 25 code_desc.origin = nullptr; 26 code_desc.unwinding_info = &unwinding_info[0]; 27 code_desc.unwinding_info_size = sizeof(unwinding_info); 28 29 Handle<Code> code = CcTest::i_isolate()->factory()->NewCode( 30 code_desc, 0, Handle<Object>::null()); 31 32 EhFrameHdr eh_frame_hdr(*code); 33 CHECK_EQ(eh_frame_hdr.lut_entries_number(), 1); 34 35 // 36 // Plugging some numbers in the DSO layout shown in eh-frame.cc: 37 // 38 // | ... | 39 // +---------------+ <-- (E) -------- 40 // | | ^ 41 // | Instructions | 10 bytes | .text 42 // | | v 43 // +---------------+ <--------------- 44 // |///////////////| 45 // |////Padding////| 6 bytes 46 // |///////////////| 47 // +---------------+ <---(D)--------- 48 // | | ^ 49 // | CIE | N bytes* | 50 // | | | 51 // +---------------+ <-- (C) | .eh_frame 52 // | | | 53 // | FDE | 30 - N bytes | 54 // | | v 55 // +---------------+ <-- (B) -------- 56 // | version | ^ 57 // +---------------+ 4 bytes | 58 // | encoding | | 59 // | specifiers | | 60 // +---------------+ <---(A) | .eh_frame_hdr 61 // | offset to | | 62 // | .eh_frame | | 63 // +---------------+ | 64 // | ... | ... 65 // 66 // (*) the size of the CIE is platform dependent. 67 // 68 CHECK_EQ(eh_frame_hdr.offset_to_eh_frame(), -(4 + 30)); // A -> D 69 CHECK_EQ(eh_frame_hdr.offset_to_procedure(), -(30 + 6 + 10)); // B -> E 70 CHECK_EQ(eh_frame_hdr.offset_to_fde(), 71 -(30 - EhFrameHdr::kCIESize)); // B -> C 72 } 73 74 TEST(DummyEhFrameHdr) { 75 CcTest::InitializeVM(); 76 HandleScope handle_scope(CcTest::i_isolate()); 77 78 byte buffer[10] = {0}; // The content is not relevant in this test 79 80 CodeDesc code_desc; 81 code_desc.buffer = &buffer[0]; 82 code_desc.buffer_size = sizeof(buffer); 83 code_desc.constant_pool_size = 0; 84 code_desc.instr_size = sizeof(buffer); 85 code_desc.reloc_size = 0; 86 code_desc.origin = nullptr; 87 code_desc.unwinding_info = nullptr; 88 code_desc.unwinding_info_size = 0; 89 90 Handle<Code> code = CcTest::i_isolate()->factory()->NewCode( 91 code_desc, 0, Handle<Object>::null()); 92 93 EhFrameHdr eh_frame_hdr(*code); 94 // A dummy header has an empty LUT 95 CHECK_EQ(eh_frame_hdr.lut_entries_number(), 0); 96 // These values should be irrelevant, but check that they have been zeroed. 97 CHECK_EQ(eh_frame_hdr.offset_to_eh_frame(), 0); 98 CHECK_EQ(eh_frame_hdr.offset_to_procedure(), 0); 99 CHECK_EQ(eh_frame_hdr.offset_to_fde(), 0); 100 } 101
