mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-19 03:29:22 +00:00
00b16889ab
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22523 91177308-0d34-0410-b5e6-96231b3b80d8
223 lines
7.7 KiB
C++
223 lines
7.7 KiB
C++
//===-- X86AsmPrinter.cpp - Convert X86 LLVM IR to X86 assembly -----------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file the shared super class printer that converts from our internal
|
|
// representation of machine-dependent LLVM code to Intel and AT&T format
|
|
// assembly language.
|
|
// This printer is the output mechanism used by `llc'.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "X86ATTAsmPrinter.h"
|
|
#include "X86IntelAsmPrinter.h"
|
|
#include "X86.h"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/Assembly/Writer.h"
|
|
#include "llvm/CodeGen/MachineConstantPool.h"
|
|
#include "llvm/Support/Mangler.h"
|
|
#include "llvm/Support/CommandLine.h"
|
|
using namespace llvm;
|
|
using namespace x86;
|
|
|
|
Statistic<> llvm::x86::EmittedInsts("asm-printer",
|
|
"Number of machine instrs printed");
|
|
|
|
enum AsmWriterFlavorTy { att, intel };
|
|
cl::opt<AsmWriterFlavorTy>
|
|
AsmWriterFlavor("x86-asm-syntax",
|
|
cl::desc("Choose style of code to emit from X86 backend:"),
|
|
cl::values(
|
|
clEnumVal(att, " Emit AT&T-style assembly"),
|
|
clEnumVal(intel, " Emit Intel-style assembly"),
|
|
clEnumValEnd),
|
|
cl::init(att));
|
|
|
|
/// doInitialization
|
|
bool X86SharedAsmPrinter::doInitialization(Module& M) {
|
|
bool leadingUnderscore = false;
|
|
forCygwin = false;
|
|
const std::string& TT = M.getTargetTriple();
|
|
if (TT.length() > 5) {
|
|
forCygwin = TT.find("cygwin") != std::string::npos ||
|
|
TT.find("mingw") != std::string::npos;
|
|
forDarwin = TT.find("darwin") != std::string::npos;
|
|
} else if (TT.empty()) {
|
|
#if defined(__CYGWIN__) || defined(__MINGW32__)
|
|
forCygwin = true;
|
|
#elif defined(__APPLE__)
|
|
forDarwin = true;
|
|
#elif defined(_WIN32)
|
|
leadingUnderscore = true;
|
|
#else
|
|
leadingUnderscore = false;
|
|
#endif
|
|
}
|
|
|
|
if (leadingUnderscore || forCygwin || forDarwin)
|
|
GlobalPrefix = "_";
|
|
|
|
if (forDarwin) {
|
|
AlignmentIsInBytes = false;
|
|
Data64bitsDirective = 0; // we can't emit a 64-bit unit
|
|
ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
|
|
}
|
|
|
|
return AsmPrinter::doInitialization(M);
|
|
}
|
|
|
|
/// printConstantPool - Print to the current output stream assembly
|
|
/// representations of the constants in the constant pool MCP. This is
|
|
/// used to print out constants which have been "spilled to memory" by
|
|
/// the code generator.
|
|
///
|
|
void X86SharedAsmPrinter::printConstantPool(MachineConstantPool *MCP) {
|
|
const std::vector<Constant*> &CP = MCP->getConstants();
|
|
const TargetData &TD = TM.getTargetData();
|
|
|
|
if (CP.empty()) return;
|
|
|
|
for (unsigned i = 0, e = CP.size(); i != e; ++i) {
|
|
if (forDarwin)
|
|
O << "\t.data\n";
|
|
else
|
|
O << "\t.section .rodata\n";
|
|
emitAlignment(TD.getTypeAlignmentShift(CP[i]->getType()));
|
|
O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t" << CommentString
|
|
<< *CP[i] << "\n";
|
|
emitGlobalConstant(CP[i]);
|
|
}
|
|
}
|
|
|
|
bool X86SharedAsmPrinter::doFinalization(Module &M) {
|
|
const TargetData &TD = TM.getTargetData();
|
|
std::string CurSection;
|
|
|
|
// Print out module-level global variables here.
|
|
for (Module::const_global_iterator I = M.global_begin(),
|
|
E = M.global_end(); I != E; ++I)
|
|
if (I->hasInitializer()) { // External global require no code
|
|
O << "\n\n";
|
|
std::string name = Mang->getValueName(I);
|
|
Constant *C = I->getInitializer();
|
|
unsigned Size = TD.getTypeSize(C->getType());
|
|
unsigned Align = TD.getTypeAlignmentShift(C->getType());
|
|
|
|
if (C->isNullValue() &&
|
|
(I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
|
|
I->hasWeakLinkage() /* FIXME: Verify correct */)) {
|
|
SwitchSection(O, CurSection, ".data");
|
|
if (!forCygwin && !forDarwin && I->hasInternalLinkage())
|
|
O << "\t.local " << name << "\n";
|
|
if (forDarwin && I->hasInternalLinkage())
|
|
O << "\t.lcomm " << name << "," << Size << "," << Align;
|
|
else
|
|
O << "\t.comm " << name << "," << Size;
|
|
if (!forCygwin && !forDarwin)
|
|
O << "," << (1 << Align);
|
|
O << "\t\t# ";
|
|
WriteAsOperand(O, I, true, true, &M);
|
|
O << "\n";
|
|
} else {
|
|
switch (I->getLinkage()) {
|
|
default: assert(0 && "Unknown linkage type!");
|
|
case GlobalValue::LinkOnceLinkage:
|
|
case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak.
|
|
// Nonnull linkonce -> weak
|
|
O << "\t.weak " << name << "\n";
|
|
SwitchSection(O, CurSection, "");
|
|
O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n";
|
|
break;
|
|
case GlobalValue::AppendingLinkage:
|
|
// FIXME: appending linkage variables should go into a section of
|
|
// their name or something. For now, just emit them as external.
|
|
case GlobalValue::ExternalLinkage:
|
|
// If external or appending, declare as a global symbol
|
|
O << "\t.globl " << name << "\n";
|
|
// FALL THROUGH
|
|
case GlobalValue::InternalLinkage:
|
|
if (C->isNullValue())
|
|
SwitchSection(O, CurSection, ".bss");
|
|
else
|
|
SwitchSection(O, CurSection, ".data");
|
|
break;
|
|
}
|
|
|
|
emitAlignment(Align);
|
|
if (!forCygwin && !forDarwin) {
|
|
O << "\t.type " << name << ",@object\n";
|
|
O << "\t.size " << name << "," << Size << "\n";
|
|
}
|
|
O << name << ":\t\t\t\t# ";
|
|
WriteAsOperand(O, I, true, true, &M);
|
|
O << " = ";
|
|
WriteAsOperand(O, C, false, false, &M);
|
|
O << "\n";
|
|
emitGlobalConstant(C);
|
|
}
|
|
}
|
|
|
|
if (forDarwin) {
|
|
// Output stubs for external global variables
|
|
if (GVStubs.begin() != GVStubs.end())
|
|
O << "\t.non_lazy_symbol_pointer\n";
|
|
for (std::set<std::string>::iterator i = GVStubs.begin(), e = GVStubs.end();
|
|
i != e; ++i) {
|
|
O << "L" << *i << "$non_lazy_ptr:\n";
|
|
O << "\t.indirect_symbol " << *i << "\n";
|
|
O << "\t.long\t0\n";
|
|
}
|
|
|
|
// Output stubs for dynamically-linked functions
|
|
unsigned j = 1;
|
|
for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
|
|
i != e; ++i, ++j) {
|
|
O << "\t.symbol_stub\n";
|
|
O << "L" << *i << "$stub:\n";
|
|
O << "\t.indirect_symbol " << *i << "\n";
|
|
O << "\tjmp\t*L" << j << "$lz\n";
|
|
O << "L" << *i << "$stub_binder:\n";
|
|
O << "\tpushl\t$L" << j << "$lz\n";
|
|
O << "\tjmp\tdyld_stub_binding_helper\n";
|
|
O << "\t.section __DATA, __la_sym_ptr3,lazy_symbol_pointers\n";
|
|
O << "L" << j << "$lz:\n";
|
|
O << "\t.indirect_symbol " << *i << "\n";
|
|
O << "\t.long\tL" << *i << "$stub_binder\n";
|
|
}
|
|
|
|
O << "\n";
|
|
|
|
// Output stubs for link-once variables
|
|
if (LinkOnceStubs.begin() != LinkOnceStubs.end())
|
|
O << ".data\n.align 2\n";
|
|
for (std::set<std::string>::iterator i = LinkOnceStubs.begin(),
|
|
e = LinkOnceStubs.end(); i != e; ++i) {
|
|
O << "L" << *i << "$non_lazy_ptr:\n"
|
|
<< "\t.long\t" << *i << '\n';
|
|
}
|
|
}
|
|
|
|
AsmPrinter::doFinalization(M);
|
|
return false; // success
|
|
}
|
|
|
|
/// createX86CodePrinterPass - Returns a pass that prints the X86 assembly code
|
|
/// for a MachineFunction to the given output stream, using the given target
|
|
/// machine description.
|
|
///
|
|
FunctionPass *llvm::createX86CodePrinterPass(std::ostream &o,TargetMachine &tm){
|
|
switch (AsmWriterFlavor) {
|
|
default:
|
|
assert(0 && "Unknown asm flavor!");
|
|
case intel:
|
|
return new X86IntelAsmPrinter(o, tm);
|
|
case att:
|
|
return new X86ATTAsmPrinter(o, tm);
|
|
}
|
|
}
|