mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-13 07:31:28 +00:00
d32c02f314
out of the AsmWriterEmitter. This patch does the physical code movement, but leaves the implementation unchanged. I'll make any changes necessary to generalize the code in a separate patch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95697 91177308-0d34-0410-b5e6-96231b3b80d8
259 lines
9.6 KiB
C++
259 lines
9.6 KiB
C++
//===- AsmWriterInst.h - Classes encapsulating a printable inst -----------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// These classes implement a parser for assembly strings.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "AsmWriterInst.h"
|
|
#include "CodeGenTarget.h"
|
|
#include "Record.h"
|
|
#include "llvm/ADT/StringExtras.h"
|
|
|
|
using namespace llvm;
|
|
|
|
static bool isIdentChar(char C) {
|
|
return (C >= 'a' && C <= 'z') ||
|
|
(C >= 'A' && C <= 'Z') ||
|
|
(C >= '0' && C <= '9') ||
|
|
C == '_';
|
|
}
|
|
|
|
std::string AsmWriterOperand::getCode() const {
|
|
if (OperandType == isLiteralTextOperand) {
|
|
if (Str.size() == 1)
|
|
return "O << '" + Str + "'; ";
|
|
return "O << \"" + Str + "\"; ";
|
|
}
|
|
|
|
if (OperandType == isLiteralStatementOperand)
|
|
return Str;
|
|
|
|
std::string Result = Str + "(MI";
|
|
if (MIOpNo != ~0U)
|
|
Result += ", " + utostr(MIOpNo);
|
|
if (!MiModifier.empty())
|
|
Result += ", \"" + MiModifier + '"';
|
|
return Result + "); ";
|
|
}
|
|
|
|
/// ParseAsmString - Parse the specified Instruction's AsmString into this
|
|
/// AsmWriterInst.
|
|
///
|
|
AsmWriterInst::AsmWriterInst(const CodeGenInstruction &CGI, Record *AsmWriter) {
|
|
this->CGI = &CGI;
|
|
|
|
unsigned Variant = AsmWriter->getValueAsInt("Variant");
|
|
int FirstOperandColumn = AsmWriter->getValueAsInt("FirstOperandColumn");
|
|
int OperandSpacing = AsmWriter->getValueAsInt("OperandSpacing");
|
|
|
|
unsigned CurVariant = ~0U; // ~0 if we are outside a {.|.|.} region, other #.
|
|
|
|
// This is the number of tabs we've seen if we're doing columnar layout.
|
|
unsigned CurColumn = 0;
|
|
|
|
|
|
// NOTE: Any extensions to this code need to be mirrored in the
|
|
// AsmPrinter::printInlineAsm code that executes as compile time (assuming
|
|
// that inline asm strings should also get the new feature)!
|
|
const std::string &AsmString = CGI.AsmString;
|
|
std::string::size_type LastEmitted = 0;
|
|
while (LastEmitted != AsmString.size()) {
|
|
std::string::size_type DollarPos =
|
|
AsmString.find_first_of("${|}\\", LastEmitted);
|
|
if (DollarPos == std::string::npos) DollarPos = AsmString.size();
|
|
|
|
// Emit a constant string fragment.
|
|
|
|
if (DollarPos != LastEmitted) {
|
|
if (CurVariant == Variant || CurVariant == ~0U) {
|
|
for (; LastEmitted != DollarPos; ++LastEmitted)
|
|
switch (AsmString[LastEmitted]) {
|
|
case '\n':
|
|
AddLiteralString("\\n");
|
|
break;
|
|
case '\t':
|
|
// If the asm writer is not using a columnar layout, \t is not
|
|
// magic.
|
|
if (FirstOperandColumn == -1 || OperandSpacing == -1) {
|
|
AddLiteralString("\\t");
|
|
} else {
|
|
// We recognize a tab as an operand delimeter.
|
|
unsigned DestColumn = FirstOperandColumn +
|
|
CurColumn++ * OperandSpacing;
|
|
Operands.push_back(
|
|
AsmWriterOperand("O.PadToColumn(" +
|
|
utostr(DestColumn) + ");\n",
|
|
AsmWriterOperand::isLiteralStatementOperand));
|
|
}
|
|
break;
|
|
case '"':
|
|
AddLiteralString("\\\"");
|
|
break;
|
|
case '\\':
|
|
AddLiteralString("\\\\");
|
|
break;
|
|
default:
|
|
AddLiteralString(std::string(1, AsmString[LastEmitted]));
|
|
break;
|
|
}
|
|
} else {
|
|
LastEmitted = DollarPos;
|
|
}
|
|
} else if (AsmString[DollarPos] == '\\') {
|
|
if (DollarPos+1 != AsmString.size() &&
|
|
(CurVariant == Variant || CurVariant == ~0U)) {
|
|
if (AsmString[DollarPos+1] == 'n') {
|
|
AddLiteralString("\\n");
|
|
} else if (AsmString[DollarPos+1] == 't') {
|
|
// If the asm writer is not using a columnar layout, \t is not
|
|
// magic.
|
|
if (FirstOperandColumn == -1 || OperandSpacing == -1) {
|
|
AddLiteralString("\\t");
|
|
break;
|
|
}
|
|
|
|
// We recognize a tab as an operand delimeter.
|
|
unsigned DestColumn = FirstOperandColumn +
|
|
CurColumn++ * OperandSpacing;
|
|
Operands.push_back(
|
|
AsmWriterOperand("O.PadToColumn(" + utostr(DestColumn) + ");\n",
|
|
AsmWriterOperand::isLiteralStatementOperand));
|
|
break;
|
|
} else if (std::string("${|}\\").find(AsmString[DollarPos+1])
|
|
!= std::string::npos) {
|
|
AddLiteralString(std::string(1, AsmString[DollarPos+1]));
|
|
} else {
|
|
throw "Non-supported escaped character found in instruction '" +
|
|
CGI.TheDef->getName() + "'!";
|
|
}
|
|
LastEmitted = DollarPos+2;
|
|
continue;
|
|
}
|
|
} else if (AsmString[DollarPos] == '{') {
|
|
if (CurVariant != ~0U)
|
|
throw "Nested variants found for instruction '" +
|
|
CGI.TheDef->getName() + "'!";
|
|
LastEmitted = DollarPos+1;
|
|
CurVariant = 0; // We are now inside of the variant!
|
|
} else if (AsmString[DollarPos] == '|') {
|
|
if (CurVariant == ~0U)
|
|
throw "'|' character found outside of a variant in instruction '"
|
|
+ CGI.TheDef->getName() + "'!";
|
|
++CurVariant;
|
|
++LastEmitted;
|
|
} else if (AsmString[DollarPos] == '}') {
|
|
if (CurVariant == ~0U)
|
|
throw "'}' character found outside of a variant in instruction '"
|
|
+ CGI.TheDef->getName() + "'!";
|
|
++LastEmitted;
|
|
CurVariant = ~0U;
|
|
} else if (DollarPos+1 != AsmString.size() &&
|
|
AsmString[DollarPos+1] == '$') {
|
|
if (CurVariant == Variant || CurVariant == ~0U) {
|
|
AddLiteralString("$"); // "$$" -> $
|
|
}
|
|
LastEmitted = DollarPos+2;
|
|
} else {
|
|
// Get the name of the variable.
|
|
std::string::size_type VarEnd = DollarPos+1;
|
|
|
|
// handle ${foo}bar as $foo by detecting whether the character following
|
|
// the dollar sign is a curly brace. If so, advance VarEnd and DollarPos
|
|
// so the variable name does not contain the leading curly brace.
|
|
bool hasCurlyBraces = false;
|
|
if (VarEnd < AsmString.size() && '{' == AsmString[VarEnd]) {
|
|
hasCurlyBraces = true;
|
|
++DollarPos;
|
|
++VarEnd;
|
|
}
|
|
|
|
while (VarEnd < AsmString.size() && isIdentChar(AsmString[VarEnd]))
|
|
++VarEnd;
|
|
std::string VarName(AsmString.begin()+DollarPos+1,
|
|
AsmString.begin()+VarEnd);
|
|
|
|
// Modifier - Support ${foo:modifier} syntax, where "modifier" is passed
|
|
// into printOperand. Also support ${:feature}, which is passed into
|
|
// PrintSpecial.
|
|
std::string Modifier;
|
|
|
|
// In order to avoid starting the next string at the terminating curly
|
|
// brace, advance the end position past it if we found an opening curly
|
|
// brace.
|
|
if (hasCurlyBraces) {
|
|
if (VarEnd >= AsmString.size())
|
|
throw "Reached end of string before terminating curly brace in '"
|
|
+ CGI.TheDef->getName() + "'";
|
|
|
|
// Look for a modifier string.
|
|
if (AsmString[VarEnd] == ':') {
|
|
++VarEnd;
|
|
if (VarEnd >= AsmString.size())
|
|
throw "Reached end of string before terminating curly brace in '"
|
|
+ CGI.TheDef->getName() + "'";
|
|
|
|
unsigned ModifierStart = VarEnd;
|
|
while (VarEnd < AsmString.size() && isIdentChar(AsmString[VarEnd]))
|
|
++VarEnd;
|
|
Modifier = std::string(AsmString.begin()+ModifierStart,
|
|
AsmString.begin()+VarEnd);
|
|
if (Modifier.empty())
|
|
throw "Bad operand modifier name in '"+ CGI.TheDef->getName() + "'";
|
|
}
|
|
|
|
if (AsmString[VarEnd] != '}')
|
|
throw "Variable name beginning with '{' did not end with '}' in '"
|
|
+ CGI.TheDef->getName() + "'";
|
|
++VarEnd;
|
|
}
|
|
if (VarName.empty() && Modifier.empty())
|
|
throw "Stray '$' in '" + CGI.TheDef->getName() +
|
|
"' asm string, maybe you want $$?";
|
|
|
|
if (VarName.empty()) {
|
|
// Just a modifier, pass this into PrintSpecial.
|
|
Operands.push_back(AsmWriterOperand("PrintSpecial", ~0U, Modifier));
|
|
} else {
|
|
// Otherwise, normal operand.
|
|
unsigned OpNo = CGI.getOperandNamed(VarName);
|
|
CodeGenInstruction::OperandInfo OpInfo = CGI.OperandList[OpNo];
|
|
|
|
if (CurVariant == Variant || CurVariant == ~0U) {
|
|
unsigned MIOp = OpInfo.MIOperandNo;
|
|
Operands.push_back(AsmWriterOperand(OpInfo.PrinterMethodName, MIOp,
|
|
Modifier));
|
|
}
|
|
}
|
|
LastEmitted = VarEnd;
|
|
}
|
|
}
|
|
|
|
Operands.push_back(AsmWriterOperand("return;",
|
|
AsmWriterOperand::isLiteralStatementOperand));
|
|
}
|
|
|
|
/// MatchesAllButOneOp - If this instruction is exactly identical to the
|
|
/// specified instruction except for one differing operand, return the differing
|
|
/// operand number. If more than one operand mismatches, return ~1, otherwise
|
|
/// if the instructions are identical return ~0.
|
|
unsigned AsmWriterInst::MatchesAllButOneOp(const AsmWriterInst &Other)const{
|
|
if (Operands.size() != Other.Operands.size()) return ~1;
|
|
|
|
unsigned MismatchOperand = ~0U;
|
|
for (unsigned i = 0, e = Operands.size(); i != e; ++i) {
|
|
if (Operands[i] != Other.Operands[i]) {
|
|
if (MismatchOperand != ~0U) // Already have one mismatch?
|
|
return ~1U;
|
|
else
|
|
MismatchOperand = i;
|
|
}
|
|
}
|
|
return MismatchOperand;
|
|
} |