1 /**************************************************************************
3 * Copyright 2009-2011 VMware, Inc.
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11 * permit persons to whom the Software is furnished to do so, subject to
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14 * The above copyright notice and this permission notice (including the
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30 #include <llvm-c/Core.h>
31 #include <llvm/Target/TargetMachine.h>
32 #include <llvm/Target/TargetInstrInfo.h>
33 #include <llvm/Support/raw_ostream.h>
34 #include <llvm/Support/Format.h>
35 #include <llvm/Support/MemoryObject.h>
37 #include <llvm/Support/TargetRegistry.h>
38 #include <llvm/MC/MCSubtargetInfo.h>
40 #include <llvm/Support/Host.h>
42 #include <llvm/IR/Module.h>
44 #include <llvm/MC/MCDisassembler.h>
45 #include <llvm/MC/MCAsmInfo.h>
46 #include <llvm/MC/MCInst.h>
47 #include <llvm/MC/MCInstPrinter.h>
48 #include <llvm/MC/MCRegisterInfo.h>
50 #if HAVE_LLVM >= 0x0303
51 #include <llvm/ADT/OwningPtr.h>
54 #if HAVE_LLVM >= 0x0305
55 #include <llvm/MC/MCContext.h>
58 #include "util/u_math.h"
59 #include "util/u_debug.h"
61 #include "lp_bld_debug.h"
73 * It is important that this check is not implemented as a macro or inlined
74 * function, as the compiler assumptions in respect to alignment of global
75 * and stack variables would often make the check a no op, defeating the
76 * whole purpose of the exercise.
79 lp_check_alignment(const void *ptr, unsigned alignment)
81 assert(util_is_power_of_two(alignment));
82 return ((uintptr_t)ptr & (alignment - 1)) == 0;
86 class raw_debug_ostream :
87 public llvm::raw_ostream
93 raw_debug_ostream() : pos(0) { }
95 void write_impl(const char *Ptr, size_t Size);
97 uint64_t current_pos() const { return pos; }
98 size_t preferred_buffer_size() const { return 512; }
103 raw_debug_ostream::write_impl(const char *Ptr, size_t Size)
106 char *lastPtr = (char *)&Ptr[Size];
107 char last = *lastPtr;
109 _debug_printf("%*s", Size, Ptr);
116 extern "C" const char *
117 lp_get_module_id(LLVMModuleRef module)
119 return llvm::unwrap(module)->getModuleIdentifier().c_str();
124 * Same as LLVMDumpValue, but through our debugging channels.
127 lp_debug_dump_value(LLVMValueRef value)
129 #if (defined(PIPE_OS_WINDOWS) && !defined(PIPE_CC_MSVC)) || defined(PIPE_OS_EMBDDED)
130 raw_debug_ostream os;
131 llvm::unwrap(value)->print(os);
134 LLVMDumpValue(value);
140 * MemoryObject wrapper around a buffer of memory, to be used by MC
143 class BufferMemoryObject:
144 public llvm::MemoryObject
147 const uint8_t *Bytes;
150 BufferMemoryObject(const uint8_t *bytes, uint64_t length) :
151 Bytes(bytes), Length(length)
155 uint64_t getBase() const
160 uint64_t getExtent() const
165 int readByte(uint64_t addr, uint8_t *byte) const
167 if (addr > getExtent())
176 * Disassemble a function, using the LLVM MC disassembler.
179 * - http://blog.llvm.org/2010/01/x86-disassembler.html
180 * - http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html
183 disassemble(const void* func, llvm::raw_ostream & Out)
185 using namespace llvm;
187 const uint8_t *bytes = (const uint8_t *)func;
190 * Limit disassembly to this extent
192 const uint64_t extent = 96 * 1024;
197 * Initialize all used objects.
200 std::string Triple = sys::getDefaultTargetTriple();
203 const Target *T = TargetRegistry::lookupTarget(Triple, Error);
205 #if HAVE_LLVM >= 0x0304
206 OwningPtr<const MCAsmInfo> AsmInfo(T->createMCAsmInfo(*T->createMCRegInfo(Triple), Triple));
208 OwningPtr<const MCAsmInfo> AsmInfo(T->createMCAsmInfo(Triple));
212 Out << "error: no assembly info for target " << Triple << "\n";
217 unsigned int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
219 OwningPtr<const MCRegisterInfo> MRI(T->createMCRegInfo(Triple));
221 Out << "error: no register info for target " << Triple.c_str() << "\n";
226 OwningPtr<const MCInstrInfo> MII(T->createMCInstrInfo());
228 Out << "error: no instruction info for target " << Triple.c_str() << "\n";
233 #if HAVE_LLVM >= 0x0305
234 OwningPtr<const MCSubtargetInfo> STI(T->createMCSubtargetInfo(Triple, sys::getHostCPUName(), ""));
235 OwningPtr<MCContext> MCCtx(new MCContext(AsmInfo.get(), MRI.get(), 0));
236 OwningPtr<const MCDisassembler> DisAsm(T->createMCDisassembler(*STI, *MCCtx));
238 OwningPtr<const MCSubtargetInfo> STI(T->createMCSubtargetInfo(Triple, sys::getHostCPUName(), ""));
239 OwningPtr<const MCDisassembler> DisAsm(T->createMCDisassembler(*STI));
242 Out << "error: no disassembler for target " << Triple << "\n";
248 OwningPtr<MCInstPrinter> Printer(
249 T->createMCInstPrinter(AsmPrinterVariant, *AsmInfo, *MII, *MRI, *STI));
251 Out << "error: no instruction printer for target " << Triple.c_str() << "\n";
256 TargetOptions options;
258 options.JITEmitDebugInfo = true;
260 #if defined(PIPE_ARCH_X86)
261 options.StackAlignmentOverride = 4;
263 #if defined(DEBUG) || defined(PROFILE)
264 options.NoFramePointerElim = true;
266 OwningPtr<TargetMachine> TM(T->createTargetMachine(Triple, sys::getHostCPUName(), "", options));
268 const TargetInstrInfo *TII = TM->getInstrInfo();
271 * Wrap the data in a MemoryObject
273 BufferMemoryObject memoryObject((const uint8_t *)bytes, extent);
282 * Print address. We use addresses relative to the start of the function,
283 * so that between runs.
286 Out << llvm::format("%6lu:\t", (unsigned long)pc);
288 if (!DisAsm->getInstruction(Inst, Size, memoryObject,
296 * Output the bytes in hexidecimal format.
301 for (i = 0; i < Size; ++i) {
302 Out << llvm::format("%02x ", ((const uint8_t*)bytes)[pc + i]);
304 for (; i < 16; ++i) {
310 * Print the instruction.
312 Printer->printInst(&Inst, Out, "");
320 const MCInstrDesc &TID = TII->get(Inst.getOpcode());
323 * Keep track of forward jumps to a nearby address.
326 if (TID.isBranch()) {
327 for (unsigned i = 0; i < Inst.getNumOperands(); ++i) {
328 const MCOperand &operand = Inst.getOperand(i);
329 if (operand.isImm()) {
333 * FIXME: Handle both relative and absolute addresses correctly.
334 * EDInstInfo actually has this info, but operandTypes and
335 * operandFlags enums are not exposed in the public interface.
343 jump = pc + operand.getImm();
349 jump = (uint64_t)operand.getImm();
353 * Output the address relative to the function start, given
354 * that MC will print the addresses relative the current pc.
356 Out << "\t\t; " << jump;
359 * Ignore far jumps given it could be actually a tail return to
374 * Stop disassembling on return statements, if there is no record of a
375 * jump to a successive address.
378 if (TID.isReturn()) {
386 * Print GDB command, useful to verify output.
390 _debug_printf("disassemble %p %p\n", bytes, bytes + pc);
401 lp_disassemble(LLVMValueRef func, const void *code) {
402 raw_debug_ostream Out;
403 disassemble(code, Out);
408 * Linux perf profiler integration.
411 * - http://penberg.blogspot.co.uk/2009/06/jato-has-profiler.html
412 * - https://github.com/penberg/jato/commit/73ad86847329d99d51b386f5aba692580d1f8fdc
413 * - http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=80d496be89ed7dede5abee5c057634e80a31c82d
416 lp_profile(LLVMValueRef func, const void *code)
418 #if defined(__linux__) && (defined(DEBUG) || defined(PROFILE))
419 static boolean first_time = TRUE;
420 static FILE *perf_map_file = NULL;
421 static int perf_asm_fd = -1;
424 * We rely on the disassembler for determining a function's size, but
425 * the disassembly is a leaky and slow operation, so avoid running
426 * this except when running inside linux perf, which can be inferred
427 * by the PERF_BUILDID_DIR environment variable.
429 if (getenv("PERF_BUILDID_DIR")) {
430 pid_t pid = getpid();
432 util_snprintf(filename, sizeof filename, "/tmp/perf-%llu.map", (unsigned long long)pid);
433 perf_map_file = fopen(filename, "wt");
434 util_snprintf(filename, sizeof filename, "/tmp/perf-%llu.map.asm", (unsigned long long)pid);
435 mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
436 perf_asm_fd = open(filename, O_WRONLY | O_CREAT, mode);
441 const char *symbol = LLVMGetValueName(func);
442 unsigned long addr = (uintptr_t)code;
443 llvm::raw_fd_ostream Out(perf_asm_fd, false);
444 Out << symbol << ":\n";
445 unsigned long size = disassemble(code, Out);
446 fprintf(perf_map_file, "%lx %lx %s\n", addr, size, symbol);
447 fflush(perf_map_file);