调试V8中JS对应的汇编代码
栏目: JavaScript · 发布时间: 7年前
内容简介:调试V8中JS对应的汇编代码
1、调试未优化代码
gdb --args ~/v8/out/ia32.debug/d8 --print-code poc.js bp v8::internal::FullCodeGenerator::MakeCode run c finish //跟c命令配对执行多次,直至打印出需要的汇编指令 Run till exit from #0 v8::internal::FullCodeGenerator::MakeCode (info=0xff873eb8) at ../src/full-codegen.cc:283 --- Raw source --- …… --- Code --- source_position = 197 kind = FUNCTION name = evil_object.toJSON Instructions (size = 128) 0x2b3301a0 0 55 push ebp 0x2b3301a1 1 89e5 mov ebp,esp …… bp * 0x2b3301a0
2、调试优化代码
gef> bp v8::internal::Context::AddOptimizedFunctiongef> run Thread 1 "d8" hit Breakpoint 1, v8::internal::Context::AddOptimizedFunction (this=0x1fe2a1083a79, function=0x1fe2a10ac281) at ../src/contexts.cc:413gef> job function 0x1fe2a10ac281: [Function] - map = 0xe7a59804099 [FastProperties] - prototype = 0x1fe2a1084069 - elements = 0x367f8ed82241 <FixedArray[0]> [FAST_HOLEY_ELEMENTS] - initial_map = - shared_info = 0x1fe2a10abdd9 <SharedFunctionInfo Ctor> - name = 0x1fe2a10abae9 <String[4]: Ctor> - formal_parameter_count = 0 - context = 0x1fe2a1083a79 <FixedArray[188]> - literals = 0x1fe2a10ac551 <FixedArray[1]> - code = 0x3e4da55066a1 <Code: OPTIMIZED_FUNCTION> - properties = { #length: 0x367f8edd2709 <AccessorInfo> (accessor constant) #name: 0x367f8edd2779 <AccessorInfo> (accessor constant) #arguments: 0x367f8edd27e9 <AccessorInfo> (accessor constant) #caller: 0x367f8edd2859 <AccessorInfo> (accessor constant) #prototype: 0x367f8edd28c9 <AccessorInfo> (accessor constant) } gef> job 0x3e4da55066a1 0x3e4da55066a1: [Code] kind = OPTIMIZED_FUNCTION stack_slots = 5 compiler = crankshaft Instructions (size = 218) 0x3e4da5506700 0 55 push rbp 0x3e4da5506701 1 4889e5 REX.W movq rbp,rsp 0x3e4da5506704 4 56 push rsi 0x3e4da5506705 5 57 push rdi …… gef> bp *0x3e4da5506700 gef> c Continuing. Thread 1 "d8" hit Breakpoint 2, 0x00003e4da5506700 in ?? () …… code:i386:x86-64 0x3e4da5506700 push rbp $pc 0x3e4da5506701 mov rbp, rsp 0x3e4da5506704 push rsi 0x3e4da5506705 push rdi 0x3e4da5506706 sub rsp, 0x8 0x3e4da550670a mov rax, QWORD PTR [rbp-0x8]
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