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// slang-ir-spirv-snippet.cpp
#include "slang-ir-spirv-snippet.h"
#include "slang-lookup-spirv.h"
#include "../core/slang-token-reader.h"
namespace Slang
{
static SpvStorageClass translateStorageClass(String name)
{
if (name == "Uniform")
{
return SpvStorageClassUniform;
}
else if (name == "StorageBuffer")
{
return SpvStorageClassStorageBuffer;
}
return (SpvStorageClass)-1;
}
SpvSnippet::ASMType parseASMType(Slang::Misc::TokenReader& tokenReader)
{
auto word = tokenReader.ReadWord();
if (word == "float")
return SpvSnippet::ASMType::Float;
else if (word == "double")
return SpvSnippet::ASMType::Double;
else if (word == "uint2")
return SpvSnippet::ASMType::UInt2;
else if (word == "float2")
return SpvSnippet::ASMType::Float2;
else if (word == "int")
return SpvSnippet::ASMType::Int;
else if (word == "_p")
return SpvSnippet::ASMType::FloatOrDouble;
return SpvSnippet::ASMType::None;
}
RefPtr<SpvSnippet> SpvSnippet::parse(UnownedStringSlice definition)
{
RefPtr<SpvSnippet> snippet = new SpvSnippet();
try
{
Dictionary<String, SpvWord> mapInstNameToIndex;
Slang::Misc::TokenReader tokenReader(definition);
// A leading "*" at the beginning of the snip modifies $resultType with
// a storage class.
if (tokenReader.AdvanceIf("*"))
{
auto storageToken = tokenReader.ReadWord();
snippet->resultStorageClass = translateStorageClass(storageToken);
}
while (!tokenReader.IsEnd())
{
SpvSnippet::ASMInst inst;
if (tokenReader.AdvanceIf("%"))
{
String instName = tokenReader.ReadToken().Content;
mapInstNameToIndex[instName] = (int)snippet->instructions.getCount();
tokenReader.Read(Slang::Misc::TokenType::OpAssign);
}
SpvOp opCode;
switch (tokenReader.NextToken().Type)
{
case Slang::Misc::TokenType::IntLiteral:
opCode = (SpvOp)tokenReader.ReadInt();
break;
case Slang::Misc::TokenType::Identifier:
{
auto opName = tokenReader.ReadWord();
if(!lookupSpvOp(opName.getUnownedSlice(), opCode))
{
throw Misc::TextFormatException(
"Text parsing error: Unrecognized SPIR-V opcode: " + opName);
}
break;
}
default:
throw Misc::TextFormatException(
"Text parsing error: SPIR-V intrinsics must begin with an integer or opcode name");
}
inst.opCode = opCode;
bool insideOperandList = true;
const bool isExtInst = inst.opCode == SpvOpExtInst;
bool isGLSLstd450OpcodeAllowed = false;
auto readExtInstOpcode = [&]()
{
switch (tokenReader.NextToken().Type)
{
case Slang::Misc::TokenType::IntLiteral:
return (SpvWord)tokenReader.ReadInt();
break;
case Slang::Misc::TokenType::Identifier:
{
if(isGLSLstd450OpcodeAllowed)
{
auto opName = tokenReader.ReadWord();
GLSLstd450 glslOpcode;
if(!lookupGLSLstd450(opName.getUnownedSlice(), glslOpcode))
{
throw Misc::TextFormatException(
"Text parsing error: Unrecognized SPIR-V GLSLstd450 opcode: " + opName);
}
printf("BNBBB: %d\n", glslOpcode);
return (SpvWord)glslOpcode;
}
}
// fallthrough
default:
throw Misc::TextFormatException(
"Text parsing error: Failed to read SPIR-V ExtInst Opcode");
}
};
while (insideOperandList)
{
ASMOperand operand = {ASMOperandType::SpvWord, 0, 0, 0};
switch (tokenReader.NextToken().Type)
{
case Slang::Misc::TokenType::Semicolon:
insideOperandList = false;
tokenReader.ReadToken();
break;
case Slang::Misc::TokenType::IntLiteral:
operand.type = SpvSnippet::ASMOperandType::SpvWord;
operand.content = tokenReader.ReadInt();
inst.operands.add(operand);
break;
case Slang::Misc::TokenType::OpMod:
{
tokenReader.ReadToken();
operand.type = SpvSnippet::ASMOperandType::InstReference;
auto refName = tokenReader.ReadToken().Content;
if (!mapInstNameToIndex.TryGetValue(refName, operand.content))
{
SLANG_ASSERT(!"Invalid SPV ASM: referenced inst is not defined.");
}
inst.operands.add(operand);
}
break;
case Slang::Misc::TokenType::Identifier:
{
auto identifier = tokenReader.ReadToken().Content;
if (identifier == "resultType")
{
operand.type = SpvSnippet::ASMOperandType::ResultTypeId;
operand.content = (SpvWord)0xFFFFFFFF;
if (tokenReader.AdvanceIf("*"))
{
// A "*" at operand qualifies the use of `resultType` with
// a storage class, but does not modify `resultType` itself.
auto storageClass = tokenReader.ReadWord();
auto spvStorageClass = translateStorageClass(storageClass);
operand.content = spvStorageClass;
snippet->usedResultTypeStorageClasses.add(spvStorageClass);
}
inst.operands.add(operand);
}
else if (identifier == "resultId")
{
operand.type = SpvSnippet::ASMOperandType::ResultId;
inst.operands.add(operand);
}
else if (identifier == "glsl450")
{
operand.type = SpvSnippet::ASMOperandType::GLSL450ExtInstSet;
inst.operands.add(operand);
// Allow the next token to be parsed as a glslsstd450 opcode
isGLSLstd450OpcodeAllowed = isExtInst;
}
else if (identifier == "fi")
{
operand.type = SpvSnippet::ASMOperandType::FloatIntegerSelection;
tokenReader.Read("(");
operand.content = readExtInstOpcode();
tokenReader.Read(",");
operand.content2 = readExtInstOpcode();
tokenReader.Read(")");
inst.operands.add(operand);
}
else if (identifier == "fus")
{
operand.type = SpvSnippet::ASMOperandType::FloatUnsignedSignedSelection;
tokenReader.Read("(");
operand.content = readExtInstOpcode();
tokenReader.Read(",");
operand.content2 = readExtInstOpcode();
tokenReader.Read(",");
operand.content3 = readExtInstOpcode();
tokenReader.Read(")");
inst.operands.add(operand);
}
else if (identifier == "_type")
{
operand.type = SpvSnippet::ASMOperandType::TypeReference;
tokenReader.Read("(");
operand.content = (SpvWord)parseASMType(tokenReader);
tokenReader.Read(")");
inst.operands.add(operand);
}
else if (identifier.startsWith("_"))
{
operand.type = SpvSnippet::ASMOperandType::ObjectReference;
operand.content = (SpvWord)StringToInt(
identifier.subString(1, identifier.getLength() - 1));
inst.operands.add(operand);
}
else if (identifier == "const")
{
operand.type = SpvSnippet::ASMOperandType::ConstantReference;
ASMConstant constant;
memset(&constant, 0, sizeof(ASMConstant));
tokenReader.Read("(");
constant.type = parseASMType(tokenReader);
int i = 0;
while (tokenReader.AdvanceIf(","))
{
switch (constant.type)
{
case ASMType::Float:
case ASMType::Float2:
case ASMType::FloatOrDouble:
constant.floatValues[i] = tokenReader.ReadFloat();
++i;
break;
default:
constant.intValues[i] = tokenReader.ReadInt();
++i;
break;
}
}
tokenReader.Read(")");
snippet->constants.add(constant);
operand.content = (SpvWord)(snippet->constants.getCount() - 1);
inst.operands.add(operand);
}
else if(isGLSLstd450OpcodeAllowed)
{
GLSLstd450 glslstd450Opcode;
lookupGLSLstd450(identifier.getUnownedSlice(), glslstd450Opcode);
operand.type = SpvSnippet::ASMOperandType::SpvWord;
operand.content = (SpvWord)glslstd450Opcode;
inst.operands.add(operand);
}
else
{
SLANG_ASSERT(!"Invalid SPV ASM operand.");
}
}
break;
default:
insideOperandList = false;
break;
}
}
snippet->instructions.add(inst);
}
}
catch (const Slang::Misc::TextFormatException&)
{
SLANG_ASSERT(!"Invalid ASM format.");
}
return snippet;
}
}
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