259 lines
6.8 KiB
C++
259 lines
6.8 KiB
C++
/**************************************************************************
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*
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* Copyright 2009-2011 VMware, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#include <stddef.h>
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#include <fstream>
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#include <sstream>
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#include <iomanip>
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#include <llvm/Config/llvm-config.h>
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#include <llvm-c/Core.h>
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#include <llvm-c/Disassembler.h>
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#include <llvm/Support/raw_ostream.h>
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#include <llvm/Support/Format.h>
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#include <llvm/Support/Host.h>
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#include <llvm/IR/Module.h>
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#include "util/u_math.h"
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#include "util/u_debug.h"
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#include "lp_bld_debug.h"
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#ifdef __linux__
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#include <sys/stat.h>
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#include <fcntl.h>
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#endif
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/**
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* Check alignment.
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*
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* It is important that this check is not implemented as a macro or inlined
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* function, as the compiler assumptions in respect to alignment of global
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* and stack variables would often make the check a no op, defeating the
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* whole purpose of the exercise.
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*/
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extern "C" boolean
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lp_check_alignment(const void *ptr, unsigned alignment)
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{
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assert(util_is_power_of_two_or_zero(alignment));
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return ((uintptr_t)ptr & (alignment - 1)) == 0;
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}
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/**
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* Same as LLVMDumpValue, but through our debugging channels.
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*/
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extern "C" void
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lp_debug_dump_value(LLVMValueRef value)
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{
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char *str = LLVMPrintValueToString(value);
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if (str) {
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os_log_message(str);
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LLVMDisposeMessage(str);
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}
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}
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/*
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* Disassemble a function, using the LLVM MC disassembler.
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*
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* See also:
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* - http://blog.llvm.org/2010/01/x86-disassembler.html
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* - http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html
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*/
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static size_t
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disassemble(const void* func, std::ostream &buffer)
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{
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const uint8_t *bytes = (const uint8_t *)func;
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/*
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* Limit disassembly to this extent
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*/
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const uint64_t extent = 96 * 1024;
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/*
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* Initialize all used objects.
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*/
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const char *triple = LLVM_HOST_TRIPLE;
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LLVMDisasmContextRef D = LLVMCreateDisasm(triple, NULL, 0, NULL, NULL);
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char outline[1024];
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if (!D) {
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buffer << "error: could not create disassembler for triple "
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<< triple << '\n';
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return 0;
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}
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uint64_t pc;
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pc = 0;
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while (pc < extent) {
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size_t Size;
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/*
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* Print address. We use addresses relative to the start of the function,
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* so that between runs.
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*/
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buffer << std::setw(6) << (unsigned long)pc << ":\t";
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Size = LLVMDisasmInstruction(D, (uint8_t *)bytes + pc, extent - pc, 0, outline,
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sizeof outline);
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if (!Size) {
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buffer << "invalid\n";
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pc += 1;
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break;
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}
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/*
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* Output the bytes in hexidecimal format.
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*/
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if (0) {
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unsigned i;
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for (i = 0; i < Size; ++i) {
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buffer << std::hex << std::setfill('0') << std::setw(2)
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<< static_cast<int> (bytes[pc + i]);
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}
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for (; i < 16; ++i) {
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buffer << std::dec << " ";
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}
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}
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/*
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* Print the instruction.
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*/
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buffer << std::setw(Size) << outline << '\n';
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/*
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* Stop disassembling on return statements, if there is no record of a
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* jump to a successive address.
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*
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* XXX: This currently assumes x86
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*/
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#if defined(PIPE_ARCH_X86) || defined(PIPE_ARCH_X86_64)
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if (Size == 1 && bytes[pc] == 0xc3) {
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break;
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}
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#endif
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/*
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* Advance.
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*/
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pc += Size;
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if (pc >= extent) {
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buffer << "disassembly larger than " << extent << " bytes, aborting\n";
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break;
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}
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}
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buffer << '\n';
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LLVMDisasmDispose(D);
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/*
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* Print GDB command, useful to verify output.
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*/
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if (0) {
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buffer << "disassemble " << static_cast<const void*>(bytes) << ' '
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<< static_cast<const void*>(bytes + pc) << '\n';
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}
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return pc;
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}
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extern "C" void
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lp_disassemble(LLVMValueRef func, const void *code)
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{
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std::ostringstream buffer;
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std::string s;
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buffer << LLVMGetValueName(func) << ":\n";
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disassemble(code, buffer);
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s = buffer.str();
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os_log_message(s.c_str());
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os_log_message("\n");
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}
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/*
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* Linux perf profiler integration.
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*
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* See also:
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* - http://penberg.blogspot.co.uk/2009/06/jato-has-profiler.html
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* - https://github.com/penberg/jato/commit/73ad86847329d99d51b386f5aba692580d1f8fdc
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* - http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=80d496be89ed7dede5abee5c057634e80a31c82d
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*/
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extern "C" void
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lp_profile(LLVMValueRef func, const void *code)
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{
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#if defined(__linux__) && defined(PROFILE)
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static std::ofstream perf_asm_file;
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static boolean first_time = TRUE;
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static FILE *perf_map_file = NULL;
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if (first_time) {
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/*
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* We rely on the disassembler for determining a function's size, but
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* the disassembly is a leaky and slow operation, so avoid running
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* this except when running inside linux perf, which can be inferred
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* by the PERF_BUILDID_DIR environment variable.
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*/
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if (getenv("PERF_BUILDID_DIR")) {
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pid_t pid = getpid();
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char filename[256];
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snprintf(filename, sizeof filename, "/tmp/perf-%llu.map", (unsigned long long)pid);
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perf_map_file = fopen(filename, "wt");
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snprintf(filename, sizeof filename, "/tmp/perf-%llu.map.asm", (unsigned long long)pid);
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perf_asm_file.open(filename);
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}
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first_time = FALSE;
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}
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if (perf_map_file) {
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const char *symbol = LLVMGetValueName(func);
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unsigned long addr = (uintptr_t)code;
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perf_asm_file << symbol << ":\n";
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unsigned long size = disassemble(code, perf_asm_file);
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perf_asm_file.flush();
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fprintf(perf_map_file, "%lx %lx %s\n", addr, size, symbol);
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fflush(perf_map_file);
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}
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#else
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(void)func;
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(void)code;
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#endif
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}
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