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llvm-6502/lib/Target/PIC16/PIC16.h

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//===-- PIC16.h - Top-level interface for PIC16 representation --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the entry points for global functions defined in
// the LLVM PIC16 back-end.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_PIC16_H
#define LLVM_TARGET_PIC16_H
#include "llvm/Target/TargetMachine.h"
#include <iosfwd>
#include <cassert>
#include <sstream>
#include <cstring>
#include <string>
namespace llvm {
class PIC16TargetMachine;
class FunctionPass;
class MachineCodeEmitter;
class raw_ostream;
namespace PIC16CC {
enum CondCodes {
EQ,
NE,
LT,
LE,
GT,
GE,
ULT,
UGT,
ULE,
UGE
};
}
// A Central class to manage all ABI naming conventions.
// PAN - [P]ic16 [A]BI [N]ames
class PAN {
public:
// Map the name of the symbol to its section name.
// Current ABI:
// -----------------------------------------------------
// ALL Names are prefixed with the symobl '@'.
// ------------------------------------------------------
// Global variables do not have any '.' in their names.
// These are maily function names and global variable names.
// Example - @foo, @i
// -------------------------------------------------------
// Functions and auto variables.
// Names are mangled as <prefix><funcname>.<tag>.<varname>
// Where <prefix> is '@' and <tag> is any one of
// the following
// .auto. - an automatic var of a function.
// .temp. - temproray data of a function.
// .ret. - return value label for a function.
// .frame. - Frame label for a function where retval, args
// and temps are stored.
// .args. - Label used to pass arguments to a direct call.
// Example - Function name: @foo
// Its frame: @foo.frame.
// Its retval: @foo.ret.
// Its local vars: @foo.auto.a
// Its temp data: @foo.temp.
// Its arg passing: @foo.args.
//----------------------------------------------
// Libcall - compiler generated libcall names must start with .lib.
// This id will be used to emit extern decls for libcalls.
// Example - libcall name: @.lib.sra.i8
// To pass args: @.lib.sra.i8.args.
// To return val: @.lib.sra.i8.ret.
//----------------------------------------------
// SECTION Names
// uninitialized globals - @udata.<num>.#
// initialized globals - @idata.<num>.#
// Function frame - @<func>.frame_section.
// Function autos - @<func>.autos_section.
// Declarations - @section.0
//----------------------------------------------------------
// Tags used to mangle different names.
enum TAGS {
PREFIX_SYMBOL,
GLOBAL,
STATIC_LOCAL,
AUTOS_LABEL,
FRAME_LABEL,
RET_LABEL,
ARGS_LABEL,
TEMPS_LABEL,
LIBCALL,
FRAME_SECTION,
AUTOS_SECTION,
CODE_SECTION
};
// Textual names of the tags.
inline static const char *getTagName(TAGS tag) {
switch (tag) {
default: return "";
case PREFIX_SYMBOL: return "@";
case AUTOS_LABEL: return ".auto.";
case FRAME_LABEL: return ".frame.";
case TEMPS_LABEL: return ".temp.";
case ARGS_LABEL: return ".args.";
case RET_LABEL: return ".ret.";
case LIBCALL: return ".lib.";
case FRAME_SECTION: return ".frame_section.";
case AUTOS_SECTION: return ".autos_section.";
case CODE_SECTION: return ".code_section.";
}
}
// Get tag type for the Symbol.
inline static TAGS getSymbolTag(const std::string &Sym) {
if (Sym.find(getTagName(TEMPS_LABEL)) != std::string::npos)
return TEMPS_LABEL;
if (Sym.find(getTagName(FRAME_LABEL)) != std::string::npos)
return FRAME_LABEL;
if (Sym.find(getTagName(RET_LABEL)) != std::string::npos)
return RET_LABEL;
if (Sym.find(getTagName(ARGS_LABEL)) != std::string::npos)
return ARGS_LABEL;
if (Sym.find(getTagName(AUTOS_LABEL)) != std::string::npos)
return AUTOS_LABEL;
if (Sym.find(getTagName(LIBCALL)) != std::string::npos)
return LIBCALL;
// It does not have any Tag. So its a true global or static local.
if (Sym.find(".") == std::string::npos)
return GLOBAL;
// If a . is there, then it may be static local.
// We should mangle these as well in clang.
if (Sym.find(".") != std::string::npos)
return STATIC_LOCAL;
assert (0 && "Could not determine Symbol's tag");
}
// addPrefix - add prefix symbol to a name if there isn't one already.
inline static std::string addPrefix (const std::string &Name) {
std::string prefix = getTagName (PREFIX_SYMBOL);
// If this name already has a prefix, nothing to do.
if (Name.compare(0, prefix.size(), prefix) == 0)
return Name;
return prefix + Name;
}
// Get mangled func name from a mangled sym name.
// In all cases func name is the first component before a '.'.
static inline std::string getFuncNameForSym(const std::string &Sym1) {
assert (getSymbolTag(Sym1) != GLOBAL && "not belongs to a function");
std::string Sym = addPrefix(Sym1);
// Position of the . after func name. That's where func name ends.
size_t func_name_end = Sym.find ('.');
return Sym.substr (0, func_name_end);
}
// Get Frame start label for a func.
static std::string getFrameLabel(const std::string &Func) {
std::string Func1 = addPrefix(Func);
std::string tag = getTagName(FRAME_LABEL);
return Func1 + tag;
}
static std::string getRetvalLabel(const std::string &Func) {
std::string Func1 = addPrefix(Func);
std::string tag = getTagName(RET_LABEL);
return Func1 + tag;
}
static std::string getArgsLabel(const std::string &Func) {
std::string Func1 = addPrefix(Func);
std::string tag = getTagName(ARGS_LABEL);
return Func1 + tag;
}
static std::string getTempdataLabel(const std::string &Func) {
std::string Func1 = addPrefix(Func);
std::string tag = getTagName(TEMPS_LABEL);
return Func1 + tag;
}
static std::string getFrameSectionName(const std::string &Func) {
std::string Func1 = addPrefix(Func);
std::string tag = getTagName(FRAME_SECTION);
return Func1 + tag + "# UDATA_OVR";
}
static std::string getAutosSectionName(const std::string &Func) {
std::string Func1 = addPrefix(Func);
std::string tag = getTagName(AUTOS_SECTION);
return Func1 + tag + "# UDATA_OVR";
}
static std::string getCodeSectionName(const std::string &Func) {
std::string Func1 = addPrefix(Func);
std::string tag = getTagName(CODE_SECTION);
return Func1 + tag + "# CODE";
}
// udata and idata section names are generated by a given number.
// @udata.<num>.#
static std::string getUdataSectionName(unsigned num) {
std::ostringstream o;
o << getTagName(PREFIX_SYMBOL) << "udata." << num << ".# UDATA";
return o.str();
}
static std::string getIdataSectionName(unsigned num) {
std::ostringstream o;
o << getTagName(PREFIX_SYMBOL) << "idata." << num << ".# IDATA";
return o.str();
}
inline static bool isLocalName (const std::string &Name) {
if (getSymbolTag(Name) == AUTOS_LABEL)
return true;
return false;
}
inline static bool isLocalToFunc (std::string &Func, std::string &Var) {
if (! isLocalName(Var)) return false;
std::string Func1 = addPrefix(Func);
// Extract func name of the varilable.
const std::string &fname = getFuncNameForSym(Var);
if (fname.compare(Func1) == 0)
return true;
return false;
}
// Get the section for the given external symbol names.
// This tries to find the type (Tag) of the symbol from its mangled name
// and return appropriate section name for it.
static inline std::string getSectionNameForSym(const std::string &Sym1) {
std::string Sym = addPrefix(Sym1);
std::string SectionName;
std::string Fname = getFuncNameForSym (Sym);
TAGS id = getSymbolTag (Sym);
switch (id) {
default : assert (0 && "Could not determine external symbol type");
case FRAME_LABEL:
case RET_LABEL:
case TEMPS_LABEL:
case ARGS_LABEL: {
return getFrameSectionName(Fname);
}
case AUTOS_LABEL: {
return getAutosSectionName(Fname);
}
}
}
}; // class PAN.
// External symbol names require memory to live till the program end.
// So we have to allocate it and keep.
inline static const char *createESName (const std::string &name) {
char *tmpName = new char[name.size() + 1];
strcpy (tmpName, name.c_str());
return tmpName;
}
inline static const char *PIC16CondCodeToString(PIC16CC::CondCodes CC) {
switch (CC) {
default: assert(0 && "Unknown condition code");
case PIC16CC::NE: return "ne";
case PIC16CC::EQ: return "eq";
case PIC16CC::LT: return "lt";
case PIC16CC::ULT: return "lt";
case PIC16CC::LE: return "le";
case PIC16CC::ULE: return "le";
case PIC16CC::GT: return "gt";
case PIC16CC::UGT: return "gt";
case PIC16CC::GE: return "ge";
case PIC16CC::UGE: return "ge";
}
}
inline static bool isSignedComparison(PIC16CC::CondCodes CC) {
switch (CC) {
default: assert(0 && "Unknown condition code");
case PIC16CC::NE:
case PIC16CC::EQ:
case PIC16CC::LT:
case PIC16CC::LE:
case PIC16CC::GE:
case PIC16CC::GT:
return true;
case PIC16CC::ULT:
case PIC16CC::UGT:
case PIC16CC::ULE:
case PIC16CC::UGE:
return false; // condition codes for unsigned comparison.
}
}
FunctionPass *createPIC16ISelDag(PIC16TargetMachine &TM);
FunctionPass *createPIC16CodePrinterPass(raw_ostream &OS,
PIC16TargetMachine &TM,
CodeGenOpt::Level OptLevel,
bool Verbose);
// Banksel optimzer pass.
FunctionPass *createPIC16MemSelOptimizerPass();
} // end namespace llvm;
// Defines symbolic names for PIC16 registers. This defines a mapping from
// register name to register number.
#include "PIC16GenRegisterNames.inc"
// Defines symbolic names for the PIC16 instructions.
#include "PIC16GenInstrNames.inc"
#endif
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