f785676f2a
all of the features in the current working draft of the upcoming C++ standard, provisionally named C++1y. The code generator's performance is greatly increased, and the loop auto-vectorizer is now enabled at -Os and -O2 in addition to -O3. The PowerPC backend has made several major improvements to code generation quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ backends have all seen major feature work. Release notes for llvm and clang can be found here: <http://llvm.org/releases/3.4/docs/ReleaseNotes.html> <http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html> MFC after: 1 month
299 lines
11 KiB
C++
299 lines
11 KiB
C++
//===- lib/MC/MCWin64EH.cpp - MCWin64EH implementation --------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCWin64EH.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCSectionCOFF.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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namespace llvm {
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// NOTE: All relocations generated here are 4-byte image-relative.
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static uint8_t CountOfUnwindCodes(std::vector<MCWin64EHInstruction> &instArray){
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uint8_t count = 0;
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for (std::vector<MCWin64EHInstruction>::const_iterator I = instArray.begin(),
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E = instArray.end(); I != E; ++I) {
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switch (I->getOperation()) {
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case Win64EH::UOP_PushNonVol:
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case Win64EH::UOP_AllocSmall:
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case Win64EH::UOP_SetFPReg:
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case Win64EH::UOP_PushMachFrame:
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count += 1;
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break;
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case Win64EH::UOP_SaveNonVol:
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case Win64EH::UOP_SaveXMM128:
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count += 2;
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break;
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case Win64EH::UOP_SaveNonVolBig:
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case Win64EH::UOP_SaveXMM128Big:
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count += 3;
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break;
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case Win64EH::UOP_AllocLarge:
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if (I->getSize() > 512*1024-8)
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count += 3;
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else
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count += 2;
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break;
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}
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}
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return count;
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}
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static void EmitAbsDifference(MCStreamer &streamer, MCSymbol *lhs,
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MCSymbol *rhs) {
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MCContext &context = streamer.getContext();
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const MCExpr *diff = MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(
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lhs, context),
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MCSymbolRefExpr::Create(
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rhs, context),
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context);
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streamer.EmitAbsValue(diff, 1);
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}
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static void EmitUnwindCode(MCStreamer &streamer, MCSymbol *begin,
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MCWin64EHInstruction &inst) {
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uint8_t b2;
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uint16_t w;
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b2 = (inst.getOperation() & 0x0F);
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switch (inst.getOperation()) {
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case Win64EH::UOP_PushNonVol:
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EmitAbsDifference(streamer, inst.getLabel(), begin);
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b2 |= (inst.getRegister() & 0x0F) << 4;
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streamer.EmitIntValue(b2, 1);
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break;
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case Win64EH::UOP_AllocLarge:
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EmitAbsDifference(streamer, inst.getLabel(), begin);
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if (inst.getSize() > 512*1024-8) {
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b2 |= 0x10;
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streamer.EmitIntValue(b2, 1);
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w = inst.getSize() & 0xFFF8;
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streamer.EmitIntValue(w, 2);
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w = inst.getSize() >> 16;
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} else {
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streamer.EmitIntValue(b2, 1);
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w = inst.getSize() >> 3;
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}
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streamer.EmitIntValue(w, 2);
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break;
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case Win64EH::UOP_AllocSmall:
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b2 |= (((inst.getSize()-8) >> 3) & 0x0F) << 4;
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EmitAbsDifference(streamer, inst.getLabel(), begin);
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streamer.EmitIntValue(b2, 1);
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break;
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case Win64EH::UOP_SetFPReg:
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EmitAbsDifference(streamer, inst.getLabel(), begin);
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streamer.EmitIntValue(b2, 1);
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break;
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case Win64EH::UOP_SaveNonVol:
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case Win64EH::UOP_SaveXMM128:
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b2 |= (inst.getRegister() & 0x0F) << 4;
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EmitAbsDifference(streamer, inst.getLabel(), begin);
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streamer.EmitIntValue(b2, 1);
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w = inst.getOffset() >> 3;
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if (inst.getOperation() == Win64EH::UOP_SaveXMM128)
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w >>= 1;
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streamer.EmitIntValue(w, 2);
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break;
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case Win64EH::UOP_SaveNonVolBig:
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case Win64EH::UOP_SaveXMM128Big:
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b2 |= (inst.getRegister() & 0x0F) << 4;
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EmitAbsDifference(streamer, inst.getLabel(), begin);
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streamer.EmitIntValue(b2, 1);
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if (inst.getOperation() == Win64EH::UOP_SaveXMM128Big)
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w = inst.getOffset() & 0xFFF0;
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else
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w = inst.getOffset() & 0xFFF8;
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streamer.EmitIntValue(w, 2);
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w = inst.getOffset() >> 16;
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streamer.EmitIntValue(w, 2);
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break;
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case Win64EH::UOP_PushMachFrame:
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if (inst.isPushCodeFrame())
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b2 |= 0x10;
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EmitAbsDifference(streamer, inst.getLabel(), begin);
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streamer.EmitIntValue(b2, 1);
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break;
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}
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}
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static void EmitSymbolRefWithOfs(MCStreamer &streamer,
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const MCSymbol *Base,
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const MCSymbol *Other) {
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MCContext &Context = streamer.getContext();
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const MCSymbolRefExpr *BaseRef = MCSymbolRefExpr::Create(Base, Context);
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const MCSymbolRefExpr *OtherRef = MCSymbolRefExpr::Create(Other, Context);
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const MCExpr *Ofs = MCBinaryExpr::CreateSub(OtherRef, BaseRef, Context);
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const MCSymbolRefExpr *BaseRefRel = MCSymbolRefExpr::Create(Base,
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MCSymbolRefExpr::VK_COFF_IMGREL32,
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Context);
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streamer.EmitValue(MCBinaryExpr::CreateAdd(BaseRefRel, Ofs, Context), 4);
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}
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static void EmitRuntimeFunction(MCStreamer &streamer,
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const MCWin64EHUnwindInfo *info) {
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MCContext &context = streamer.getContext();
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streamer.EmitValueToAlignment(4);
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EmitSymbolRefWithOfs(streamer, info->Function, info->Begin);
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EmitSymbolRefWithOfs(streamer, info->Function, info->End);
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streamer.EmitValue(MCSymbolRefExpr::Create(info->Symbol,
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MCSymbolRefExpr::VK_COFF_IMGREL32,
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context), 4);
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}
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static void EmitUnwindInfo(MCStreamer &streamer, MCWin64EHUnwindInfo *info) {
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// If this UNWIND_INFO already has a symbol, it's already been emitted.
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if (info->Symbol) return;
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MCContext &context = streamer.getContext();
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streamer.EmitValueToAlignment(4);
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info->Symbol = context.CreateTempSymbol();
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streamer.EmitLabel(info->Symbol);
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// Upper 3 bits are the version number (currently 1).
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uint8_t flags = 0x01;
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if (info->ChainedParent)
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flags |= Win64EH::UNW_ChainInfo << 3;
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else {
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if (info->HandlesUnwind)
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flags |= Win64EH::UNW_TerminateHandler << 3;
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if (info->HandlesExceptions)
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flags |= Win64EH::UNW_ExceptionHandler << 3;
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}
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streamer.EmitIntValue(flags, 1);
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if (info->PrologEnd)
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EmitAbsDifference(streamer, info->PrologEnd, info->Begin);
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else
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streamer.EmitIntValue(0, 1);
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uint8_t numCodes = CountOfUnwindCodes(info->Instructions);
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streamer.EmitIntValue(numCodes, 1);
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uint8_t frame = 0;
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if (info->LastFrameInst >= 0) {
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MCWin64EHInstruction &frameInst = info->Instructions[info->LastFrameInst];
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assert(frameInst.getOperation() == Win64EH::UOP_SetFPReg);
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frame = (frameInst.getRegister() & 0x0F) |
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(frameInst.getOffset() & 0xF0);
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}
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streamer.EmitIntValue(frame, 1);
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// Emit unwind instructions (in reverse order).
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uint8_t numInst = info->Instructions.size();
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for (uint8_t c = 0; c < numInst; ++c) {
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MCWin64EHInstruction inst = info->Instructions.back();
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info->Instructions.pop_back();
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EmitUnwindCode(streamer, info->Begin, inst);
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}
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// For alignment purposes, the instruction array will always have an even
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// number of entries, with the final entry potentially unused (in which case
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// the array will be one longer than indicated by the count of unwind codes
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// field).
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if (numCodes & 1) {
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streamer.EmitIntValue(0, 2);
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}
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if (flags & (Win64EH::UNW_ChainInfo << 3))
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EmitRuntimeFunction(streamer, info->ChainedParent);
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else if (flags &
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((Win64EH::UNW_TerminateHandler|Win64EH::UNW_ExceptionHandler) << 3))
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streamer.EmitValue(MCSymbolRefExpr::Create(info->ExceptionHandler,
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MCSymbolRefExpr::VK_COFF_IMGREL32,
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context), 4);
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else if (numCodes == 0) {
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// The minimum size of an UNWIND_INFO struct is 8 bytes. If we're not
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// a chained unwind info, if there is no handler, and if there are fewer
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// than 2 slots used in the unwind code array, we have to pad to 8 bytes.
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streamer.EmitIntValue(0, 4);
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}
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}
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StringRef MCWin64EHUnwindEmitter::GetSectionSuffix(const MCSymbol *func) {
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if (!func || !func->isInSection()) return "";
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const MCSection *section = &func->getSection();
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const MCSectionCOFF *COFFSection;
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if ((COFFSection = dyn_cast<MCSectionCOFF>(section))) {
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StringRef name = COFFSection->getSectionName();
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size_t dollar = name.find('$');
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size_t dot = name.find('.', 1);
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if (dollar == StringRef::npos && dot == StringRef::npos)
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return "";
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if (dot == StringRef::npos)
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return name.substr(dollar);
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if (dollar == StringRef::npos || dot < dollar)
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return name.substr(dot);
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return name.substr(dollar);
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}
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return "";
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}
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static const MCSection *getWin64EHTableSection(StringRef suffix,
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MCContext &context) {
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if (suffix == "")
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return context.getObjectFileInfo()->getXDataSection();
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return context.getCOFFSection((".xdata"+suffix).str(),
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COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
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COFF::IMAGE_SCN_MEM_READ,
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SectionKind::getDataRel());
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}
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static const MCSection *getWin64EHFuncTableSection(StringRef suffix,
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MCContext &context) {
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if (suffix == "")
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return context.getObjectFileInfo()->getPDataSection();
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return context.getCOFFSection((".pdata"+suffix).str(),
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COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
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COFF::IMAGE_SCN_MEM_READ,
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SectionKind::getDataRel());
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}
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void MCWin64EHUnwindEmitter::EmitUnwindInfo(MCStreamer &streamer,
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MCWin64EHUnwindInfo *info) {
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// Switch sections (the static function above is meant to be called from
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// here and from Emit().
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MCContext &context = streamer.getContext();
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const MCSection *xdataSect =
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getWin64EHTableSection(GetSectionSuffix(info->Function), context);
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streamer.SwitchSection(xdataSect);
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llvm::EmitUnwindInfo(streamer, info);
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}
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void MCWin64EHUnwindEmitter::Emit(MCStreamer &streamer) {
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MCContext &context = streamer.getContext();
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// Emit the unwind info structs first.
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for (unsigned i = 0; i < streamer.getNumW64UnwindInfos(); ++i) {
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MCWin64EHUnwindInfo &info = streamer.getW64UnwindInfo(i);
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const MCSection *xdataSect =
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getWin64EHTableSection(GetSectionSuffix(info.Function), context);
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streamer.SwitchSection(xdataSect);
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llvm::EmitUnwindInfo(streamer, &info);
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}
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// Now emit RUNTIME_FUNCTION entries.
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for (unsigned i = 0; i < streamer.getNumW64UnwindInfos(); ++i) {
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MCWin64EHUnwindInfo &info = streamer.getW64UnwindInfo(i);
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const MCSection *pdataSect =
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getWin64EHFuncTableSection(GetSectionSuffix(info.Function), context);
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streamer.SwitchSection(pdataSect);
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EmitRuntimeFunction(streamer, &info);
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}
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}
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} // End of namespace llvm
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