mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-24 08:29:39 +00:00
d04a8d4b33
Sooooo many of these had incorrect or strange main module includes. I have manually inspected all of these, and fixed the main module include to be the nearest plausible thing I could find. If you own or care about any of these source files, I encourage you to take some time and check that these edits were sensible. I can't have broken anything (I strictly added headers, and reordered them, never removed), but they may not be the headers you'd really like to identify as containing the API being implemented. Many forward declarations and missing includes were added to a header files to allow them to parse cleanly when included first. The main module rule does in fact have its merits. =] git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169131 91177308-0d34-0410-b5e6-96231b3b80d8
279 lines
9.5 KiB
C++
279 lines
9.5 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 b1, 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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b1 = inst.getOffset() & 0xF0;
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streamer.EmitIntValue(b1, 1);
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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 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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streamer.EmitValue(MCSymbolRefExpr::Create(info->Begin, context), 4);
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streamer.EmitValue(MCSymbolRefExpr::Create(info->End, context), 4);
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streamer.EmitValue(MCSymbolRefExpr::Create(info->Symbol, 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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// Upper 3 bits are the version number (currently 1).
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uint8_t flags = 0x01;
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info->Symbol = context.CreateTempSymbol();
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streamer.EmitLabel(info->Symbol);
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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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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, context),
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4);
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else if (numCodes < 2) {
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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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if (numCodes == 1)
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streamer.EmitIntValue(0, 2);
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else
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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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