split inline asm support out to its own .cpp file.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100340 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp b/lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp
new file mode 100644
index 0000000..d776351
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp
@@ -0,0 +1,315 @@
+//===-- 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;
+}
+