forked from OSchip/llvm-project
431 lines
15 KiB
C++
431 lines
15 KiB
C++
//===- VFABIDemangling.cpp - Vector Function ABI demangling utilities. ---===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/ADT/SmallSet.h"
|
|
#include "llvm/ADT/SmallString.h"
|
|
#include "llvm/Analysis/VectorUtils.h"
|
|
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
/// Utilities for the Vector Function ABI name parser.
|
|
|
|
/// Return types for the parser functions.
|
|
enum class ParseRet {
|
|
OK, // Found.
|
|
None, // Not found.
|
|
Error // Syntax error.
|
|
};
|
|
|
|
/// Extracts the `<isa>` information from the mangled string, and
|
|
/// sets the `ISA` accordingly.
|
|
ParseRet tryParseISA(StringRef &MangledName, VFISAKind &ISA) {
|
|
if (MangledName.empty())
|
|
return ParseRet::Error;
|
|
|
|
if (MangledName.startswith(VFABI::_LLVM_)) {
|
|
MangledName = MangledName.drop_front(strlen(VFABI::_LLVM_));
|
|
ISA = VFISAKind::LLVM;
|
|
} else {
|
|
ISA = StringSwitch<VFISAKind>(MangledName.take_front(1))
|
|
.Case("n", VFISAKind::AdvancedSIMD)
|
|
.Case("s", VFISAKind::SVE)
|
|
.Case("b", VFISAKind::SSE)
|
|
.Case("c", VFISAKind::AVX)
|
|
.Case("d", VFISAKind::AVX2)
|
|
.Case("e", VFISAKind::AVX512)
|
|
.Default(VFISAKind::Unknown);
|
|
MangledName = MangledName.drop_front(1);
|
|
}
|
|
|
|
return ParseRet::OK;
|
|
}
|
|
|
|
/// Extracts the `<mask>` information from the mangled string, and
|
|
/// sets `IsMasked` accordingly. The input string `MangledName` is
|
|
/// left unmodified.
|
|
ParseRet tryParseMask(StringRef &MangledName, bool &IsMasked) {
|
|
if (MangledName.consume_front("M")) {
|
|
IsMasked = true;
|
|
return ParseRet::OK;
|
|
}
|
|
|
|
if (MangledName.consume_front("N")) {
|
|
IsMasked = false;
|
|
return ParseRet::OK;
|
|
}
|
|
|
|
return ParseRet::Error;
|
|
}
|
|
|
|
/// Extract the `<vlen>` information from the mangled string, and
|
|
/// sets `VF` accordingly. A `<vlen> == "x"` token is interpreted as a scalable
|
|
/// vector length. On success, the `<vlen>` token is removed from
|
|
/// the input string `ParseString`.
|
|
///
|
|
ParseRet tryParseVLEN(StringRef &ParseString, unsigned &VF, bool &IsScalable) {
|
|
if (ParseString.consume_front("x")) {
|
|
VF = 0;
|
|
IsScalable = true;
|
|
return ParseRet::OK;
|
|
}
|
|
|
|
if (ParseString.consumeInteger(10, VF))
|
|
return ParseRet::Error;
|
|
|
|
IsScalable = false;
|
|
return ParseRet::OK;
|
|
}
|
|
|
|
/// The function looks for the following strings at the beginning of
|
|
/// the input string `ParseString`:
|
|
///
|
|
/// <token> <number>
|
|
///
|
|
/// On success, it removes the parsed parameter from `ParseString`,
|
|
/// sets `PKind` to the correspondent enum value, sets `Pos` to
|
|
/// <number>, and return success. On a syntax error, it return a
|
|
/// parsing error. If nothing is parsed, it returns None.
|
|
///
|
|
/// The function expects <token> to be one of "ls", "Rs", "Us" or
|
|
/// "Ls".
|
|
ParseRet tryParseLinearTokenWithRuntimeStep(StringRef &ParseString,
|
|
VFParamKind &PKind, int &Pos,
|
|
const StringRef Token) {
|
|
if (ParseString.consume_front(Token)) {
|
|
PKind = VFABI::getVFParamKindFromString(Token);
|
|
if (ParseString.consumeInteger(10, Pos))
|
|
return ParseRet::Error;
|
|
return ParseRet::OK;
|
|
}
|
|
|
|
return ParseRet::None;
|
|
}
|
|
|
|
/// The function looks for the following stringt at the beginning of
|
|
/// the input string `ParseString`:
|
|
///
|
|
/// <token> <number>
|
|
///
|
|
/// <token> is one of "ls", "Rs", "Us" or "Ls".
|
|
///
|
|
/// On success, it removes the parsed parameter from `ParseString`,
|
|
/// sets `PKind` to the correspondent enum value, sets `StepOrPos` to
|
|
/// <number>, and return success. On a syntax error, it return a
|
|
/// parsing error. If nothing is parsed, it returns None.
|
|
ParseRet tryParseLinearWithRuntimeStep(StringRef &ParseString,
|
|
VFParamKind &PKind, int &StepOrPos) {
|
|
ParseRet Ret;
|
|
|
|
// "ls" <RuntimeStepPos>
|
|
Ret = tryParseLinearTokenWithRuntimeStep(ParseString, PKind, StepOrPos, "ls");
|
|
if (Ret != ParseRet::None)
|
|
return Ret;
|
|
|
|
// "Rs" <RuntimeStepPos>
|
|
Ret = tryParseLinearTokenWithRuntimeStep(ParseString, PKind, StepOrPos, "Rs");
|
|
if (Ret != ParseRet::None)
|
|
return Ret;
|
|
|
|
// "Ls" <RuntimeStepPos>
|
|
Ret = tryParseLinearTokenWithRuntimeStep(ParseString, PKind, StepOrPos, "Ls");
|
|
if (Ret != ParseRet::None)
|
|
return Ret;
|
|
|
|
// "Us" <RuntimeStepPos>
|
|
Ret = tryParseLinearTokenWithRuntimeStep(ParseString, PKind, StepOrPos, "Us");
|
|
if (Ret != ParseRet::None)
|
|
return Ret;
|
|
|
|
return ParseRet::None;
|
|
}
|
|
|
|
/// The function looks for the following strings at the beginning of
|
|
/// the input string `ParseString`:
|
|
///
|
|
/// <token> {"n"} <number>
|
|
///
|
|
/// On success, it removes the parsed parameter from `ParseString`,
|
|
/// sets `PKind` to the correspondent enum value, sets `LinearStep` to
|
|
/// <number>, and return success. On a syntax error, it return a
|
|
/// parsing error. If nothing is parsed, it returns None.
|
|
///
|
|
/// The function expects <token> to be one of "l", "R", "U" or
|
|
/// "L".
|
|
ParseRet tryParseCompileTimeLinearToken(StringRef &ParseString,
|
|
VFParamKind &PKind, int &LinearStep,
|
|
const StringRef Token) {
|
|
if (ParseString.consume_front(Token)) {
|
|
PKind = VFABI::getVFParamKindFromString(Token);
|
|
const bool Negate = ParseString.consume_front("n");
|
|
if (ParseString.consumeInteger(10, LinearStep))
|
|
LinearStep = 1;
|
|
if (Negate)
|
|
LinearStep *= -1;
|
|
return ParseRet::OK;
|
|
}
|
|
|
|
return ParseRet::None;
|
|
}
|
|
|
|
/// The function looks for the following strings at the beginning of
|
|
/// the input string `ParseString`:
|
|
///
|
|
/// ["l" | "R" | "U" | "L"] {"n"} <number>
|
|
///
|
|
/// On success, it removes the parsed parameter from `ParseString`,
|
|
/// sets `PKind` to the correspondent enum value, sets `LinearStep` to
|
|
/// <number>, and return success. On a syntax error, it return a
|
|
/// parsing error. If nothing is parsed, it returns None.
|
|
ParseRet tryParseLinearWithCompileTimeStep(StringRef &ParseString,
|
|
VFParamKind &PKind, int &StepOrPos) {
|
|
// "l" {"n"} <CompileTimeStep>
|
|
if (tryParseCompileTimeLinearToken(ParseString, PKind, StepOrPos, "l") ==
|
|
ParseRet::OK)
|
|
return ParseRet::OK;
|
|
|
|
// "R" {"n"} <CompileTimeStep>
|
|
if (tryParseCompileTimeLinearToken(ParseString, PKind, StepOrPos, "R") ==
|
|
ParseRet::OK)
|
|
return ParseRet::OK;
|
|
|
|
// "L" {"n"} <CompileTimeStep>
|
|
if (tryParseCompileTimeLinearToken(ParseString, PKind, StepOrPos, "L") ==
|
|
ParseRet::OK)
|
|
return ParseRet::OK;
|
|
|
|
// "U" {"n"} <CompileTimeStep>
|
|
if (tryParseCompileTimeLinearToken(ParseString, PKind, StepOrPos, "U") ==
|
|
ParseRet::OK)
|
|
return ParseRet::OK;
|
|
|
|
return ParseRet::None;
|
|
}
|
|
|
|
/// The function looks for the following strings at the beginning of
|
|
/// the input string `ParseString`:
|
|
///
|
|
/// "u" <number>
|
|
///
|
|
/// On success, it removes the parsed parameter from `ParseString`,
|
|
/// sets `PKind` to the correspondent enum value, sets `Pos` to
|
|
/// <number>, and return success. On a syntax error, it return a
|
|
/// parsing error. If nothing is parsed, it returns None.
|
|
ParseRet tryParseUniform(StringRef &ParseString, VFParamKind &PKind, int &Pos) {
|
|
// "u" <Pos>
|
|
const char *UniformToken = "u";
|
|
if (ParseString.consume_front(UniformToken)) {
|
|
PKind = VFABI::getVFParamKindFromString(UniformToken);
|
|
if (ParseString.consumeInteger(10, Pos))
|
|
return ParseRet::Error;
|
|
|
|
return ParseRet::OK;
|
|
}
|
|
return ParseRet::None;
|
|
}
|
|
|
|
/// Looks into the <parameters> part of the mangled name in search
|
|
/// for valid paramaters at the beginning of the string
|
|
/// `ParseString`.
|
|
///
|
|
/// On success, it removes the parsed parameter from `ParseString`,
|
|
/// sets `PKind` to the correspondent enum value, sets `StepOrPos`
|
|
/// accordingly, and return success. On a syntax error, it return a
|
|
/// parsing error. If nothing is parsed, it returns None.
|
|
ParseRet tryParseParameter(StringRef &ParseString, VFParamKind &PKind,
|
|
int &StepOrPos) {
|
|
if (ParseString.consume_front("v")) {
|
|
PKind = VFParamKind::Vector;
|
|
StepOrPos = 0;
|
|
return ParseRet::OK;
|
|
}
|
|
|
|
const ParseRet HasLinearRuntime =
|
|
tryParseLinearWithRuntimeStep(ParseString, PKind, StepOrPos);
|
|
if (HasLinearRuntime != ParseRet::None)
|
|
return HasLinearRuntime;
|
|
|
|
const ParseRet HasLinearCompileTime =
|
|
tryParseLinearWithCompileTimeStep(ParseString, PKind, StepOrPos);
|
|
if (HasLinearCompileTime != ParseRet::None)
|
|
return HasLinearCompileTime;
|
|
|
|
const ParseRet HasUniform = tryParseUniform(ParseString, PKind, StepOrPos);
|
|
if (HasUniform != ParseRet::None)
|
|
return HasUniform;
|
|
|
|
return ParseRet::None;
|
|
}
|
|
|
|
/// Looks into the <parameters> part of the mangled name in search
|
|
/// of a valid 'aligned' clause. The function should be invoked
|
|
/// after parsing a parameter via `tryParseParameter`.
|
|
///
|
|
/// On success, it removes the parsed parameter from `ParseString`,
|
|
/// sets `PKind` to the correspondent enum value, sets `StepOrPos`
|
|
/// accordingly, and return success. On a syntax error, it return a
|
|
/// parsing error. If nothing is parsed, it returns None.
|
|
ParseRet tryParseAlign(StringRef &ParseString, Align &Alignment) {
|
|
uint64_t Val;
|
|
// "a" <number>
|
|
if (ParseString.consume_front("a")) {
|
|
if (ParseString.consumeInteger(10, Val))
|
|
return ParseRet::Error;
|
|
|
|
if (!isPowerOf2_64(Val))
|
|
return ParseRet::Error;
|
|
|
|
Alignment = Align(Val);
|
|
|
|
return ParseRet::OK;
|
|
}
|
|
|
|
return ParseRet::None;
|
|
}
|
|
} // namespace
|
|
|
|
// Format of the ABI name:
|
|
// _ZGV<isa><mask><vlen><parameters>_<scalarname>[(<redirection>)]
|
|
Optional<VFInfo> VFABI::tryDemangleForVFABI(StringRef MangledName) {
|
|
const StringRef OriginalName = MangledName;
|
|
// Assume there is no custom name <redirection>, and therefore the
|
|
// vector name consists of
|
|
// _ZGV<isa><mask><vlen><parameters>_<scalarname>.
|
|
StringRef VectorName = MangledName;
|
|
|
|
// Parse the fixed size part of the manled name
|
|
if (!MangledName.consume_front("_ZGV"))
|
|
return None;
|
|
|
|
// Extract ISA. An unknow ISA is also supported, so we accept all
|
|
// values.
|
|
VFISAKind ISA;
|
|
if (tryParseISA(MangledName, ISA) != ParseRet::OK)
|
|
return None;
|
|
|
|
// Extract <mask>.
|
|
bool IsMasked;
|
|
if (tryParseMask(MangledName, IsMasked) != ParseRet::OK)
|
|
return None;
|
|
|
|
// Parse the variable size, starting from <vlen>.
|
|
unsigned VF;
|
|
bool IsScalable;
|
|
if (tryParseVLEN(MangledName, VF, IsScalable) != ParseRet::OK)
|
|
return None;
|
|
|
|
// Parse the <parameters>.
|
|
ParseRet ParamFound;
|
|
SmallVector<VFParameter, 8> Parameters;
|
|
do {
|
|
const unsigned ParameterPos = Parameters.size();
|
|
VFParamKind PKind;
|
|
int StepOrPos;
|
|
ParamFound = tryParseParameter(MangledName, PKind, StepOrPos);
|
|
|
|
// Bail off if there is a parsing error in the parsing of the parameter.
|
|
if (ParamFound == ParseRet::Error)
|
|
return None;
|
|
|
|
if (ParamFound == ParseRet::OK) {
|
|
Align Alignment;
|
|
// Look for the alignment token "a <number>".
|
|
const ParseRet AlignFound = tryParseAlign(MangledName, Alignment);
|
|
// Bail off if there is a syntax error in the align token.
|
|
if (AlignFound == ParseRet::Error)
|
|
return None;
|
|
|
|
// Add the parameter.
|
|
Parameters.push_back({ParameterPos, PKind, StepOrPos, Alignment});
|
|
}
|
|
} while (ParamFound == ParseRet::OK);
|
|
|
|
// A valid MangledName must have at least one valid entry in the
|
|
// <parameters>.
|
|
if (Parameters.empty())
|
|
return None;
|
|
|
|
// Check for the <scalarname> and the optional <redirection>, which
|
|
// are separated from the prefix with "_"
|
|
if (!MangledName.consume_front("_"))
|
|
return None;
|
|
|
|
// The rest of the string must be in the format:
|
|
// <scalarname>[(<redirection>)]
|
|
const StringRef ScalarName =
|
|
MangledName.take_while([](char In) { return In != '('; });
|
|
|
|
if (ScalarName.empty())
|
|
return None;
|
|
|
|
// Reduce MangledName to [(<redirection>)].
|
|
MangledName = MangledName.ltrim(ScalarName);
|
|
// Find the optional custom name redirection.
|
|
if (MangledName.consume_front("(")) {
|
|
if (!MangledName.consume_back(")"))
|
|
return None;
|
|
// Update the vector variant with the one specified by the user.
|
|
VectorName = MangledName;
|
|
// If the vector name is missing, bail out.
|
|
if (VectorName.empty())
|
|
return None;
|
|
}
|
|
|
|
// LLVM internal mapping via the TargetLibraryInfo (TLI) must be
|
|
// redirected to an existing name.
|
|
if (ISA == VFISAKind::LLVM && VectorName == OriginalName)
|
|
return None;
|
|
|
|
// When <mask> is "M", we need to add a parameter that is used as
|
|
// global predicate for the function.
|
|
if (IsMasked) {
|
|
const unsigned Pos = Parameters.size();
|
|
Parameters.push_back({Pos, VFParamKind::GlobalPredicate});
|
|
}
|
|
|
|
// Asserts for parameters of type `VFParamKind::GlobalPredicate`, as
|
|
// prescribed by the Vector Function ABI specifications supported by
|
|
// this parser:
|
|
// 1. Uniqueness.
|
|
// 2. Must be the last in the parameter list.
|
|
const auto NGlobalPreds = std::count_if(
|
|
Parameters.begin(), Parameters.end(), [](const VFParameter PK) {
|
|
return PK.ParamKind == VFParamKind::GlobalPredicate;
|
|
});
|
|
assert(NGlobalPreds < 2 && "Cannot have more than one global predicate.");
|
|
if (NGlobalPreds)
|
|
assert(Parameters.back().ParamKind == VFParamKind::GlobalPredicate &&
|
|
"The global predicate must be the last parameter");
|
|
|
|
const VFShape Shape({VF, IsScalable, Parameters});
|
|
return VFInfo({Shape, ScalarName, VectorName, ISA});
|
|
}
|
|
|
|
VFParamKind VFABI::getVFParamKindFromString(const StringRef Token) {
|
|
const VFParamKind ParamKind = StringSwitch<VFParamKind>(Token)
|
|
.Case("v", VFParamKind::Vector)
|
|
.Case("l", VFParamKind::OMP_Linear)
|
|
.Case("R", VFParamKind::OMP_LinearRef)
|
|
.Case("L", VFParamKind::OMP_LinearVal)
|
|
.Case("U", VFParamKind::OMP_LinearUVal)
|
|
.Case("ls", VFParamKind::OMP_LinearPos)
|
|
.Case("Ls", VFParamKind::OMP_LinearValPos)
|
|
.Case("Rs", VFParamKind::OMP_LinearRefPos)
|
|
.Case("Us", VFParamKind::OMP_LinearUValPos)
|
|
.Case("u", VFParamKind::OMP_Uniform)
|
|
.Default(VFParamKind::Unknown);
|
|
|
|
if (ParamKind != VFParamKind::Unknown)
|
|
return ParamKind;
|
|
|
|
// This function should never be invoked with an invalid input.
|
|
llvm_unreachable("This fuction should be invoken only on parameters"
|
|
" that have a textual representation in the mangled name"
|
|
" of the Vector Function ABI");
|
|
}
|