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split inline asm support out to its own .cpp file.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100340 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-04-04 18:34:07 +00:00
parent 285199502b
commit 736e31d0cf
4 changed files with 368 additions and 337 deletions
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315
lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp Normal file
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//===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the AsmPrinter class.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#include "llvm/InlineAsm.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <cerrno> // FIXME: Stop using this.
using namespace llvm;
/// EmitInlineAsm - Emit a blob of inline asm to the output streamer.
void AsmPrinter::EmitInlineAsm(StringRef Str) const {
assert(!Str.empty() && "Can't emit empty inline asm block");
// If the output streamer is actually a .s file, just emit the blob textually.
// This is useful in case the asm parser doesn't handle something but the
// system assembler does.
if (OutStreamer.hasRawTextSupport()) {
OutStreamer.EmitRawText(Str);
return;
}
errs() << "Inline asm not supported by this streamer!\n";
}
/// EmitInlineAsm - This method formats and emits the specified machine
/// instruction that is an inline asm.
void AsmPrinter::EmitInlineAsm(const MachineInstr *MI) const {
assert(MI->isInlineAsm() && "printInlineAsm only works on inline asms");
unsigned NumOperands = MI->getNumOperands();
// Count the number of register definitions to find the asm string.
unsigned NumDefs = 0;
for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
++NumDefs)
assert(NumDefs != NumOperands-1 && "No asm string?");
assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
// Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
// If this asmstr is empty, just print the #APP/#NOAPP markers.
// These are useful to see where empty asm's wound up.
if (AsmStr[0] == 0) {
if (!OutStreamer.hasRawTextSupport()) return;
OutStreamer.EmitRawText(Twine("\t")+MAI->getCommentString()+
MAI->getInlineAsmStart());
OutStreamer.EmitRawText(Twine("\t")+MAI->getCommentString()+
MAI->getInlineAsmEnd());
return;
}
// Emit the #APP start marker. This has to happen even if verbose-asm isn't
// enabled, so we use EmitRawText.
if (OutStreamer.hasRawTextSupport())
OutStreamer.EmitRawText(Twine("\t")+MAI->getCommentString()+
MAI->getInlineAsmStart());
// Emit the inline asm to a temporary string so we can emit it through
// EmitInlineAsm.
SmallString<256> StringData;
raw_svector_ostream OS(StringData);
OS << '\t';
// The variant of the current asmprinter.
int AsmPrinterVariant = MAI->getAssemblerDialect();
int CurVariant = -1; // The number of the {.|.|.} region we are in.
const char *LastEmitted = AsmStr; // One past the last character emitted.
while (*LastEmitted) {
switch (*LastEmitted) {
default: {
// Not a special case, emit the string section literally.
const char *LiteralEnd = LastEmitted+1;
while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
*LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
++LiteralEnd;
if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
OS.write(LastEmitted, LiteralEnd-LastEmitted);
LastEmitted = LiteralEnd;
break;
}
case '\n':
++LastEmitted; // Consume newline character.
OS << '\n'; // Indent code with newline.
break;
case '$': {
++LastEmitted; // Consume '$' character.
bool Done = true;
// Handle escapes.
switch (*LastEmitted) {
default: Done = false; break;
case '$': // $$ -> $
if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
OS << '$';
++LastEmitted; // Consume second '$' character.
break;
case '(': // $( -> same as GCC's { character.
++LastEmitted; // Consume '(' character.
if (CurVariant != -1) {
llvm_report_error("Nested variants found in inline asm string: '"
+ std::string(AsmStr) + "'");
}
CurVariant = 0; // We're in the first variant now.
break;
case '|':
++LastEmitted; // consume '|' character.
if (CurVariant == -1)
OS << '|'; // this is gcc's behavior for | outside a variant
else
++CurVariant; // We're in the next variant.
break;
case ')': // $) -> same as GCC's } char.
++LastEmitted; // consume ')' character.
if (CurVariant == -1)
OS << '}'; // this is gcc's behavior for } outside a variant
else
CurVariant = -1;
break;
}
if (Done) break;
bool HasCurlyBraces = false;
if (*LastEmitted == '{') { // ${variable}
++LastEmitted; // Consume '{' character.
HasCurlyBraces = true;
}
// If we have ${:foo}, then this is not a real operand reference, it is a
// "magic" string reference, just like in .td files. Arrange to call
// PrintSpecial.
if (HasCurlyBraces && *LastEmitted == ':') {
++LastEmitted;
const char *StrStart = LastEmitted;
const char *StrEnd = strchr(StrStart, '}');
if (StrEnd == 0)
llvm_report_error(Twine("Unterminated ${:foo} operand in inline asm"
" string: '") + Twine(AsmStr) + "'");
std::string Val(StrStart, StrEnd);
PrintSpecial(MI, OS, Val.c_str());
LastEmitted = StrEnd+1;
break;
}
const char *IDStart = LastEmitted;
char *IDEnd;
errno = 0;
long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
llvm_report_error("Bad $ operand number in inline asm string: '"
+ std::string(AsmStr) + "'");
}
LastEmitted = IDEnd;
char Modifier[2] = { 0, 0 };
if (HasCurlyBraces) {
// If we have curly braces, check for a modifier character. This
// supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
if (*LastEmitted == ':') {
++LastEmitted; // Consume ':' character.
if (*LastEmitted == 0) {
llvm_report_error("Bad ${:} expression in inline asm string: '"
+ std::string(AsmStr) + "'");
}
Modifier[0] = *LastEmitted;
++LastEmitted; // Consume modifier character.
}
if (*LastEmitted != '}') {
llvm_report_error("Bad ${} expression in inline asm string: '"
+ std::string(AsmStr) + "'");
}
++LastEmitted; // Consume '}' character.
}
if ((unsigned)Val >= NumOperands-1) {
llvm_report_error("Invalid $ operand number in inline asm string: '"
+ std::string(AsmStr) + "'");
}
// Okay, we finally have a value number. Ask the target to print this
// operand!
if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
unsigned OpNo = 1;
bool Error = false;
// Scan to find the machine operand number for the operand.
for (; Val; --Val) {
if (OpNo >= MI->getNumOperands()) break;
unsigned OpFlags = MI->getOperand(OpNo).getImm();
OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
}
if (OpNo >= MI->getNumOperands()) {
Error = true;
} else {
unsigned OpFlags = MI->getOperand(OpNo).getImm();
++OpNo; // Skip over the ID number.
if (Modifier[0] == 'l') // labels are target independent
// FIXME: What if the operand isn't an MBB, report error?
OS << *MI->getOperand(OpNo).getMBB()->getSymbol();
else {
AsmPrinter *AP = const_cast<AsmPrinter*>(this);
if ((OpFlags & 7) == 4) {
Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
Modifier[0] ? Modifier : 0,
OS);
} else {
Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
Modifier[0] ? Modifier : 0, OS);
}
}
}
if (Error) {
std::string msg;
raw_string_ostream Msg(msg);
Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
MI->print(Msg);
llvm_report_error(Msg.str());
}
}
break;
}
}
}
OS << "\n";
EmitInlineAsm(OS.str());
// Emit the #NOAPP end marker. This has to happen even if verbose-asm isn't
// enabled, so we use EmitRawText.
if (OutStreamer.hasRawTextSupport())
OutStreamer.EmitRawText(Twine("\t")+MAI->getCommentString()+
MAI->getInlineAsmEnd());
}
/// PrintSpecial - Print information related to the specified machine instr
/// that is independent of the operand, and may be independent of the instr
/// itself. This can be useful for portably encoding the comment character
/// or other bits of target-specific knowledge into the asmstrings. The
/// syntax used is ${:comment}. Targets can override this to add support
/// for their own strange codes.
void AsmPrinter::PrintSpecial(const MachineInstr *MI, raw_ostream &OS,
const char *Code) const {
if (!strcmp(Code, "private")) {
OS << MAI->getPrivateGlobalPrefix();
} else if (!strcmp(Code, "comment")) {
OS << MAI->getCommentString();
} else if (!strcmp(Code, "uid")) {
// Comparing the address of MI isn't sufficient, because machineinstrs may
// be allocated to the same address across functions.
// If this is a new LastFn instruction, bump the counter.
if (LastMI != MI || LastFn != getFunctionNumber()) {
++Counter;
LastMI = MI;
LastFn = getFunctionNumber();
}
OS << Counter;
} else {
std::string msg;
raw_string_ostream Msg(msg);
Msg << "Unknown special formatter '" << Code
<< "' for machine instr: " << *MI;
llvm_report_error(Msg.str());
}
}
/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
/// instruction, using the specified assembler variant. Targets should
/// override this to format as appropriate.
bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &O) {
// Target doesn't support this yet!
return true;
}
bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant,
const char *ExtraCode, raw_ostream &O) {
// Target doesn't support this yet!
return true;
}