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commands and into the common code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42752 91177308-0d34-0410-b5e6-96231b3b80d8
505 lines
18 KiB
C++
505 lines
18 KiB
C++
//===-- llvm-bcanalyzer.cpp - Bitcode Analyzer --------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Reid Spencer and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This tool may be invoked in the following manner:
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// llvm-bcanalyzer [options] - Read LLVM bitcode from stdin
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// llvm-bcanalyzer [options] x.bc - Read LLVM bitcode from the x.bc file
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//
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// Options:
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// --help - Output information about command line switches
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// --dump - Dump low-level bitcode structure in readable format
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//
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// This tool provides analytical information about a bitcode file. It is
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// intended as an aid to developers of bitcode reading and writing software. It
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// produces on std::out a summary of the bitcode file that shows various
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// statistics about the contents of the file. By default this information is
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// detailed and contains information about individual bitcode blocks and the
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// functions in the module.
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// The tool is also able to print a bitcode file in a straight forward text
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// format that shows the containment and relationships of the information in
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// the bitcode file (-dump option).
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/Verifier.h"
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#include "llvm/Bitcode/BitstreamReader.h"
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#include "llvm/Bitcode/LLVMBitCodes.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/System/Signals.h"
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#include <map>
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#include <fstream>
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#include <iostream>
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#include <algorithm>
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using namespace llvm;
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static cl::opt<std::string>
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InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
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static cl::opt<std::string>
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OutputFilename("-o", cl::init("-"), cl::desc("<output file>"));
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static cl::opt<bool> Dump("dump", cl::desc("Dump low level bitcode trace"));
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//===----------------------------------------------------------------------===//
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// Bitcode specific analysis.
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//===----------------------------------------------------------------------===//
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static cl::opt<bool> NoHistogram("disable-histogram",
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cl::desc("Do not print per-code histogram"));
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static cl::opt<bool>
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NonSymbolic("non-symbolic",
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cl::desc("Emit numberic info in dump even if"
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" symbolic info is available"));
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/// CurStreamType - If we can sniff the flavor of this stream, we can produce
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/// better dump info.
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static enum {
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UnknownBitstream,
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LLVMIRBitstream
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} CurStreamType;
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/// GetBlockName - Return a symbolic block name if known, otherwise return
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/// null.
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static const char *GetBlockName(unsigned BlockID) {
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// Standard blocks for all bitcode files.
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if (BlockID < bitc::FIRST_APPLICATION_BLOCKID) {
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if (BlockID == bitc::BLOCKINFO_BLOCK_ID)
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return "BLOCKINFO_BLOCK";
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return 0;
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}
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if (CurStreamType != LLVMIRBitstream) return 0;
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switch (BlockID) {
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default: return 0;
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case bitc::MODULE_BLOCK_ID: return "MODULE_BLOCK";
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case bitc::PARAMATTR_BLOCK_ID: return "PARAMATTR_BLOCK";
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case bitc::TYPE_BLOCK_ID: return "TYPE_BLOCK";
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case bitc::CONSTANTS_BLOCK_ID: return "CONSTANTS_BLOCK";
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case bitc::FUNCTION_BLOCK_ID: return "FUNCTION_BLOCK";
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case bitc::TYPE_SYMTAB_BLOCK_ID: return "TYPE_SYMTAB";
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case bitc::VALUE_SYMTAB_BLOCK_ID: return "VALUE_SYMTAB";
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}
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}
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/// GetCodeName - Return a symbolic code name if known, otherwise return
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/// null.
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static const char *GetCodeName(unsigned CodeID, unsigned BlockID) {
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// Standard blocks for all bitcode files.
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if (BlockID < bitc::FIRST_APPLICATION_BLOCKID) {
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if (BlockID == bitc::BLOCKINFO_BLOCK_ID) {
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switch (CodeID) {
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default: return 0;
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case bitc::MODULE_CODE_VERSION: return "VERSION";
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}
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}
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return 0;
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}
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if (CurStreamType != LLVMIRBitstream) return 0;
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switch (BlockID) {
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default: return 0;
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case bitc::MODULE_BLOCK_ID:
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switch (CodeID) {
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default: return 0;
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case bitc::MODULE_CODE_VERSION: return "VERSION";
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case bitc::MODULE_CODE_TRIPLE: return "TRIPLE";
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case bitc::MODULE_CODE_DATALAYOUT: return "DATALAYOUT";
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case bitc::MODULE_CODE_ASM: return "ASM";
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case bitc::MODULE_CODE_SECTIONNAME: return "SECTIONNAME";
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case bitc::MODULE_CODE_DEPLIB: return "DEPLIB";
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case bitc::MODULE_CODE_GLOBALVAR: return "GLOBALVAR";
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case bitc::MODULE_CODE_FUNCTION: return "FUNCTION";
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case bitc::MODULE_CODE_ALIAS: return "ALIAS";
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case bitc::MODULE_CODE_PURGEVALS: return "PURGEVALS";
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}
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case bitc::PARAMATTR_BLOCK_ID:
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switch (CodeID) {
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default: return 0;
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case bitc::PARAMATTR_CODE_ENTRY: return "ENTRY";
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}
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case bitc::TYPE_BLOCK_ID:
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switch (CodeID) {
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default: return 0;
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case bitc::TYPE_CODE_NUMENTRY: return "NUMENTRY";
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case bitc::TYPE_CODE_VOID: return "VOID";
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case bitc::TYPE_CODE_FLOAT: return "FLOAT";
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case bitc::TYPE_CODE_DOUBLE: return "DOUBLE";
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case bitc::TYPE_CODE_LABEL: return "LABEL";
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case bitc::TYPE_CODE_OPAQUE: return "OPAQUE";
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case bitc::TYPE_CODE_INTEGER: return "INTEGER";
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case bitc::TYPE_CODE_POINTER: return "POINTER";
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case bitc::TYPE_CODE_FUNCTION: return "FUNCTION";
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case bitc::TYPE_CODE_STRUCT: return "STRUCT";
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case bitc::TYPE_CODE_ARRAY: return "ARRAY";
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case bitc::TYPE_CODE_VECTOR: return "VECTOR";
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}
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case bitc::CONSTANTS_BLOCK_ID:
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switch (CodeID) {
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default: return 0;
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case bitc::CST_CODE_SETTYPE: return "SETTYPE";
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case bitc::CST_CODE_NULL: return "NULL";
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case bitc::CST_CODE_UNDEF: return "UNDEF";
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case bitc::CST_CODE_INTEGER: return "INTEGER";
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case bitc::CST_CODE_WIDE_INTEGER: return "WIDE_INTEGER";
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case bitc::CST_CODE_FLOAT: return "FLOAT";
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case bitc::CST_CODE_AGGREGATE: return "AGGREGATE";
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case bitc::CST_CODE_STRING: return "STRING";
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case bitc::CST_CODE_CSTRING: return "CSTRING";
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case bitc::CST_CODE_CE_BINOP: return "CE_BINOP";
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case bitc::CST_CODE_CE_CAST: return "CE_CAST";
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case bitc::CST_CODE_CE_GEP: return "CE_GEP";
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case bitc::CST_CODE_CE_SELECT: return "CE_SELECT";
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case bitc::CST_CODE_CE_EXTRACTELT: return "CE_EXTRACTELT";
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case bitc::CST_CODE_CE_INSERTELT: return "CE_INSERTELT";
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case bitc::CST_CODE_CE_SHUFFLEVEC: return "CE_SHUFFLEVEC";
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case bitc::CST_CODE_CE_CMP: return "CE_CMP";
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case bitc::CST_CODE_INLINEASM: return "INLINEASM";
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}
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case bitc::FUNCTION_BLOCK_ID:
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switch (CodeID) {
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default: return 0;
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case bitc::FUNC_CODE_DECLAREBLOCKS: return "DECLAREBLOCKS";
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case bitc::FUNC_CODE_INST_BINOP: return "INST_BINOP";
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case bitc::FUNC_CODE_INST_CAST: return "INST_CAST";
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case bitc::FUNC_CODE_INST_GEP: return "INST_GEP";
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case bitc::FUNC_CODE_INST_SELECT: return "INST_SELECT";
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case bitc::FUNC_CODE_INST_EXTRACTELT: return "INST_EXTRACTELT";
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case bitc::FUNC_CODE_INST_INSERTELT: return "INST_INSERTELT";
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case bitc::FUNC_CODE_INST_SHUFFLEVEC: return "INST_SHUFFLEVEC";
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case bitc::FUNC_CODE_INST_CMP: return "INST_CMP";
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case bitc::FUNC_CODE_INST_RET: return "INST_RET";
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case bitc::FUNC_CODE_INST_BR: return "INST_BR";
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case bitc::FUNC_CODE_INST_SWITCH: return "INST_SWITCH";
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case bitc::FUNC_CODE_INST_INVOKE: return "INST_INVOKE";
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case bitc::FUNC_CODE_INST_UNWIND: return "INST_UNWIND";
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case bitc::FUNC_CODE_INST_UNREACHABLE: return "INST_UNREACHABLE";
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case bitc::FUNC_CODE_INST_PHI: return "INST_PHI";
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case bitc::FUNC_CODE_INST_MALLOC: return "INST_MALLOC";
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case bitc::FUNC_CODE_INST_FREE: return "INST_FREE";
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case bitc::FUNC_CODE_INST_ALLOCA: return "INST_ALLOCA";
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case bitc::FUNC_CODE_INST_LOAD: return "INST_LOAD";
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case bitc::FUNC_CODE_INST_STORE: return "INST_STORE";
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case bitc::FUNC_CODE_INST_CALL: return "INST_CALL";
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case bitc::FUNC_CODE_INST_VAARG: return "INST_VAARG";
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}
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case bitc::TYPE_SYMTAB_BLOCK_ID:
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switch (CodeID) {
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default: return 0;
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case bitc::TST_CODE_ENTRY: return "ENTRY";
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}
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case bitc::VALUE_SYMTAB_BLOCK_ID:
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switch (CodeID) {
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default: return 0;
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case bitc::VST_CODE_ENTRY: return "ENTRY";
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case bitc::VST_CODE_BBENTRY: return "BBENTRY";
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}
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}
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}
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struct PerBlockIDStats {
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/// NumInstances - This the number of times this block ID has been seen.
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unsigned NumInstances;
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/// NumBits - The total size in bits of all of these blocks.
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uint64_t NumBits;
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/// NumSubBlocks - The total number of blocks these blocks contain.
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unsigned NumSubBlocks;
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/// NumAbbrevs - The total number of abbreviations.
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unsigned NumAbbrevs;
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/// NumRecords - The total number of records these blocks contain, and the
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/// number that are abbreviated.
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unsigned NumRecords, NumAbbreviatedRecords;
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/// CodeFreq - Keep track of the number of times we see each code.
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std::vector<unsigned> CodeFreq;
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PerBlockIDStats()
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: NumInstances(0), NumBits(0),
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NumSubBlocks(0), NumAbbrevs(0), NumRecords(0), NumAbbreviatedRecords(0) {}
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};
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static std::map<unsigned, PerBlockIDStats> BlockIDStats;
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/// Error - All bitcode analysis errors go through this function, making this a
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/// good place to breakpoint if debugging.
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static bool Error(const std::string &Err) {
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std::cerr << Err << "\n";
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return true;
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}
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/// ParseBlock - Read a block, updating statistics, etc.
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static bool ParseBlock(BitstreamReader &Stream, unsigned IndentLevel) {
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std::string Indent(IndentLevel*2, ' ');
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uint64_t BlockBitStart = Stream.GetCurrentBitNo();
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unsigned BlockID = Stream.ReadSubBlockID();
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// Get the statistics for this BlockID.
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PerBlockIDStats &BlockStats = BlockIDStats[BlockID];
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BlockStats.NumInstances++;
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// BLOCKINFO is a special part of the stream.
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if (BlockID == bitc::BLOCKINFO_BLOCK_ID) {
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if (Dump) std::cerr << Indent << "<BLOCKINFO_BLOCK/>\n";
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if (Stream.ReadBlockInfoBlock())
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return Error("Malformed BlockInfoBlock");
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uint64_t BlockBitEnd = Stream.GetCurrentBitNo();
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BlockStats.NumBits += BlockBitEnd-BlockBitStart;
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return false;
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}
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unsigned NumWords = 0;
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if (Stream.EnterSubBlock(BlockID, &NumWords))
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return Error("Malformed block record");
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const char *BlockName = 0;
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if (Dump) {
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std::cerr << Indent << "<";
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if ((BlockName = GetBlockName(BlockID)))
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std::cerr << BlockName;
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else
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std::cerr << "UnknownBlock" << BlockID;
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if (NonSymbolic && BlockName)
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std::cerr << " BlockID=" << BlockID;
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std::cerr << " NumWords=" << NumWords
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<< " BlockCodeSize=" << Stream.GetAbbrevIDWidth() << ">\n";
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}
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SmallVector<uint64_t, 64> Record;
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// Read all the records for this block.
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while (1) {
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if (Stream.AtEndOfStream())
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return Error("Premature end of bitstream");
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// Read the code for this record.
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unsigned AbbrevID = Stream.ReadCode();
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switch (AbbrevID) {
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case bitc::END_BLOCK: {
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if (Stream.ReadBlockEnd())
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return Error("Error at end of block");
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uint64_t BlockBitEnd = Stream.GetCurrentBitNo();
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BlockStats.NumBits += BlockBitEnd-BlockBitStart;
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if (Dump) {
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std::cerr << Indent << "</";
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if (BlockName)
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std::cerr << BlockName << ">\n";
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else
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std::cerr << "UnknownBlock" << BlockID << ">\n";
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}
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return false;
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}
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case bitc::ENTER_SUBBLOCK: {
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uint64_t SubBlockBitStart = Stream.GetCurrentBitNo();
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if (ParseBlock(Stream, IndentLevel+1))
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return true;
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++BlockStats.NumSubBlocks;
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uint64_t SubBlockBitEnd = Stream.GetCurrentBitNo();
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// Don't include subblock sizes in the size of this block.
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BlockBitStart += SubBlockBitEnd-SubBlockBitStart;
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break;
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}
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case bitc::DEFINE_ABBREV:
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Stream.ReadAbbrevRecord();
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++BlockStats.NumAbbrevs;
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break;
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default:
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++BlockStats.NumRecords;
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if (AbbrevID != bitc::UNABBREV_RECORD)
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++BlockStats.NumAbbreviatedRecords;
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Record.clear();
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unsigned Code = Stream.ReadRecord(AbbrevID, Record);
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// Increment the # occurrences of this code.
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if (BlockStats.CodeFreq.size() <= Code)
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BlockStats.CodeFreq.resize(Code+1);
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BlockStats.CodeFreq[Code]++;
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if (Dump) {
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std::cerr << Indent << " <";
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if (const char *CodeName = GetCodeName(Code, BlockID))
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std::cerr << CodeName;
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else
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std::cerr << "UnknownCode" << Code;
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if (NonSymbolic && GetCodeName(Code, BlockID))
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std::cerr << " codeid=" << Code;
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if (AbbrevID != bitc::UNABBREV_RECORD)
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std::cerr << " abbrevid=" << AbbrevID;
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for (unsigned i = 0, e = Record.size(); i != e; ++i)
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std::cerr << " op" << i << "=" << (int64_t)Record[i];
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std::cerr << "/>\n";
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}
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break;
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}
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}
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}
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static void PrintSize(double Bits) {
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std::cerr << Bits << "b/" << Bits/8 << "B/" << Bits/32 << "W";
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}
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/// AnalyzeBitcode - Analyze the bitcode file specified by InputFilename.
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static int AnalyzeBitcode() {
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// Read the input file.
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MemoryBuffer *Buffer;
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if (InputFilename == "-")
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Buffer = MemoryBuffer::getSTDIN();
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else
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Buffer = MemoryBuffer::getFile(&InputFilename[0], InputFilename.size());
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if (Buffer == 0)
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return Error("Error reading '" + InputFilename + "'.");
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if (Buffer->getBufferSize() & 3)
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return Error("Bitcode stream should be a multiple of 4 bytes in length");
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unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart();
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BitstreamReader Stream(BufPtr, BufPtr+Buffer->getBufferSize());
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// Read the stream signature.
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char Signature[6];
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Signature[0] = Stream.Read(8);
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Signature[1] = Stream.Read(8);
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Signature[2] = Stream.Read(4);
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Signature[3] = Stream.Read(4);
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Signature[4] = Stream.Read(4);
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Signature[5] = Stream.Read(4);
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// Autodetect the file contents, if it is one we know.
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CurStreamType = UnknownBitstream;
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if (Signature[0] == 'B' && Signature[1] == 'C' &&
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Signature[2] == 0x0 && Signature[3] == 0xC &&
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Signature[4] == 0xE && Signature[5] == 0xD)
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CurStreamType = LLVMIRBitstream;
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unsigned NumTopBlocks = 0;
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// Parse the top-level structure. We only allow blocks at the top-level.
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while (!Stream.AtEndOfStream()) {
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unsigned Code = Stream.ReadCode();
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if (Code != bitc::ENTER_SUBBLOCK)
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return Error("Invalid record at top-level");
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if (ParseBlock(Stream, 0))
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return true;
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++NumTopBlocks;
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}
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if (Dump) std::cerr << "\n\n";
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uint64_t BufferSizeBits = Buffer->getBufferSize()*8;
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// Print a summary of the read file.
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std::cerr << "Summary of " << InputFilename << ":\n";
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std::cerr << " Total size: ";
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PrintSize(BufferSizeBits);
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std::cerr << "\n";
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std::cerr << " Stream type: ";
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switch (CurStreamType) {
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default: assert(0 && "Unknown bitstream type");
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case UnknownBitstream: std::cerr << "unknown\n"; break;
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case LLVMIRBitstream: std::cerr << "LLVM IR\n"; break;
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}
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std::cerr << " # Toplevel Blocks: " << NumTopBlocks << "\n";
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std::cerr << "\n";
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// Emit per-block stats.
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std::cerr << "Per-block Summary:\n";
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for (std::map<unsigned, PerBlockIDStats>::iterator I = BlockIDStats.begin(),
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E = BlockIDStats.end(); I != E; ++I) {
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std::cerr << " Block ID #" << I->first;
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if (const char *BlockName = GetBlockName(I->first))
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std::cerr << " (" << BlockName << ")";
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std::cerr << ":\n";
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const PerBlockIDStats &Stats = I->second;
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std::cerr << " Num Instances: " << Stats.NumInstances << "\n";
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std::cerr << " Total Size: ";
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PrintSize(Stats.NumBits);
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std::cerr << "\n";
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std::cerr << " % of file: "
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<< Stats.NumBits/(double)BufferSizeBits*100 << "\n";
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if (Stats.NumInstances > 1) {
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std::cerr << " Average Size: ";
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PrintSize(Stats.NumBits/(double)Stats.NumInstances);
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std::cerr << "\n";
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std::cerr << " Tot/Avg SubBlocks: " << Stats.NumSubBlocks << "/"
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<< Stats.NumSubBlocks/(double)Stats.NumInstances << "\n";
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std::cerr << " Tot/Avg Abbrevs: " << Stats.NumAbbrevs << "/"
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<< Stats.NumAbbrevs/(double)Stats.NumInstances << "\n";
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std::cerr << " Tot/Avg Records: " << Stats.NumRecords << "/"
|
|
<< Stats.NumRecords/(double)Stats.NumInstances << "\n";
|
|
} else {
|
|
std::cerr << " Num SubBlocks: " << Stats.NumSubBlocks << "\n";
|
|
std::cerr << " Num Abbrevs: " << Stats.NumAbbrevs << "\n";
|
|
std::cerr << " Num Records: " << Stats.NumRecords << "\n";
|
|
}
|
|
if (Stats.NumRecords)
|
|
std::cerr << " % Abbrev Recs: " << (Stats.NumAbbreviatedRecords/
|
|
(double)Stats.NumRecords)*100 << "\n";
|
|
std::cerr << "\n";
|
|
|
|
// Print a histogram of the codes we see.
|
|
if (!NoHistogram && !Stats.CodeFreq.empty()) {
|
|
std::vector<std::pair<unsigned, unsigned> > FreqPairs; // <freq,code>
|
|
for (unsigned i = 0, e = Stats.CodeFreq.size(); i != e; ++i)
|
|
if (unsigned Freq = Stats.CodeFreq[i])
|
|
FreqPairs.push_back(std::make_pair(Freq, i));
|
|
std::stable_sort(FreqPairs.begin(), FreqPairs.end());
|
|
std::reverse(FreqPairs.begin(), FreqPairs.end());
|
|
|
|
std::cerr << "\tCode Histogram:\n";
|
|
for (unsigned i = 0, e = FreqPairs.size(); i != e; ++i) {
|
|
std::cerr << "\t\t" << FreqPairs[i].first << "\t";
|
|
if (const char *CodeName = GetCodeName(FreqPairs[i].second, I->first))
|
|
std::cerr << CodeName << "\n";
|
|
else
|
|
std::cerr << "UnknownCode" << FreqPairs[i].second << "\n";
|
|
}
|
|
std::cerr << "\n";
|
|
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
int main(int argc, char **argv) {
|
|
llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
|
|
cl::ParseCommandLineOptions(argc, argv, "llvm-bcanalyzer file analyzer\n");
|
|
|
|
sys::PrintStackTraceOnErrorSignal();
|
|
|
|
return AnalyzeBitcode();
|
|
}
|