/
compiler.cpp
1503 lines (1494 loc) · 76.8 KB
/
compiler.cpp
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/*
* This is the core of the compiler, a part of the compiler that produces
* assembly code. The code is somewhat ugly (lots of else-if-s), but
* there doesn't appear to be an easy way to avoid that. Using inheritance
* would lead to countless classes and code that's even harder to understand
* and debug. Allegedly, compilers can be nicely structured using the
* visitor behavioral pattern, but, honestly, I don't understand it and
* I doubt it would help significantly.
*/
#include "bitManipulations.cpp"
#include "semanticAnalyzer.cpp"
#include <ciso646> // Necessary for Microsoft C++ Compiler.
AssemblyCode convertToInteger32(
const TreeNode &
node, // HappySkeptic suggested me to use constant references to avoid
// Stack Overflow:
// https://atheistforums.org/thread-63150-post-2054368.html#pid2054368
const CompilationContext &context) {
auto originalCode = node.compile(context);
const AssemblyCode::AssemblyType i32 = AssemblyCode::AssemblyType::i32,
i64 = AssemblyCode::AssemblyType::i64,
f32 = AssemblyCode::AssemblyType::f32,
f64 = AssemblyCode::AssemblyType::f64,
null = AssemblyCode::AssemblyType::null;
if (originalCode.assemblyType == null) {
std::cerr
<< "Line " << node.lineNumber << ", Column " << node.columnNumber
<< ", Compiler error: Some part of the compiler attempted to convert \""
<< node.text
<< "\" to \"Integer32\", which makes no sense. This could be an "
"internal compiler error, or there could be something semantically "
"(though not grammatically) very wrong with your program."
<< std::endl;
exit(1);
}
if (originalCode.assemblyType == i32)
return originalCode;
if (originalCode.assemblyType == i64)
return AssemblyCode(
"(i32.wrap_i64\n" + std::string(originalCode.indentBy(1)) + "\n)", i32);
if (originalCode.assemblyType == f32)
return AssemblyCode(
"(i32.trunc_f32_s\n" + std::string(originalCode.indentBy(1)) + "\n)",
i32); // Makes little sense to me (that, when converting to an integer,
// the decimal part of the number is simply truncated), but that's
// how it is done in the vast majority of programming languages.
if (originalCode.assemblyType == f64)
return AssemblyCode("(i32.trunc_f64_s\n" +
std::string(originalCode.indentBy(1)) + "\n)",
i32);
std::cerr << "Line " << node.lineNumber << ", Column " << node.columnNumber
<< ", Compiler error: Internal compiler error, control reached the "
"end of the \"convertToInteger32\" function!"
<< std::endl;
throw std::runtime_error("Logic error in \"convertToInteger32\"");
return AssemblyCode("()");
}
AssemblyCode convertToInteger64(const TreeNode &node,
const CompilationContext &context) {
auto originalCode = node.compile(context);
const AssemblyCode::AssemblyType i32 = AssemblyCode::AssemblyType::i32,
i64 = AssemblyCode::AssemblyType::i64,
f32 = AssemblyCode::AssemblyType::f32,
f64 = AssemblyCode::AssemblyType::f64,
null = AssemblyCode::AssemblyType::null;
if (originalCode.assemblyType == null) {
std::cerr
<< "Line " << node.lineNumber << ", Column " << node.columnNumber
<< ", Compiler error: Some part of the compiler attempted to convert \""
<< node.text
<< "\" to \"Integer64\", which makes no sense. This could be an "
"internal compiler error, or there could be something semantically "
"(though not grammatically) very wrong with your program."
<< std::endl;
exit(1);
}
if (originalCode.assemblyType == i32)
return AssemblyCode(
"(i64.extend_i32_s\n" + // If you don't put "_s", JavaScript Virtual
// Machine is going to interpret the argument as
// unsigned, leading to huge positive numbers
// instead of negative ones.
std::string(originalCode.indentBy(1)) + "\n)",
i64);
if (originalCode.assemblyType == i64)
return originalCode;
if (originalCode.assemblyType == f32)
return AssemblyCode("(i64.trunc_f32_s\n" +
std::string(originalCode.indentBy(1)) + "\n)",
i64);
if (originalCode.assemblyType == f64)
return AssemblyCode("(i64.trunc_f64_s\n" +
std::string(originalCode.indentBy(1)) + "\n)",
i64);
std::cerr << "Line " << node.lineNumber << ", Column " << node.columnNumber
<< ", Compiler error: Internal compiler error, control reached the "
"end of the \"convertToInteger64\" function!"
<< std::endl;
throw std::runtime_error("Logic error in \"convertToInteger64\"");
return AssemblyCode("()");
}
AssemblyCode convertToDecimal32(const TreeNode &node,
const CompilationContext &context) {
auto originalCode = node.compile(context);
const AssemblyCode::AssemblyType i32 = AssemblyCode::AssemblyType::i32,
i64 = AssemblyCode::AssemblyType::i64,
f32 = AssemblyCode::AssemblyType::f32,
f64 = AssemblyCode::AssemblyType::f64,
null = AssemblyCode::AssemblyType::null;
if (originalCode.assemblyType == null) {
std::cerr
<< "Line " << node.lineNumber << ", Column " << node.columnNumber
<< ", Compiler error: Some part of the compiler attempted to convert \""
<< node.text
<< "\" to \"Decimal32\", which makes no sense. This could be an "
"internal compiler error, or there could be something semantically "
"(though not grammatically) very wrong with your program."
<< std::endl;
exit(1);
}
if (originalCode.assemblyType == i32)
return AssemblyCode(
"(f32.convert_i32_s\n" + // Again, those who designed JavaScript Virtual
// Machine had a weird idea that integers
// should be unsigned unless somebody makes
// them explicitly signed via "_s".
std::string(originalCode.indentBy(1)) + "\n)",
f32);
if (originalCode.assemblyType == i64)
return AssemblyCode("(f32.convert_i64_s\n" +
std::string(originalCode.indentBy(1)) + "\n)",
f32);
if (originalCode.assemblyType == f32)
return originalCode;
if (originalCode.assemblyType == f64)
return AssemblyCode("(f32.demote_f64\n" +
std::string(originalCode.indentBy(1)) + "\n)",
f32);
std::cerr << "Line " << node.lineNumber << ", Column " << node.columnNumber
<< ", Compiler error: Internal compiler error, control reached the "
"end of the \"convertToDecimal32\" function!"
<< std::endl;
throw std::runtime_error("Logic error in \"convertToDecimal32\"");
return AssemblyCode("()");
}
AssemblyCode convertToDecimal64(const TreeNode &node,
const CompilationContext &context) {
auto originalCode = node.compile(context);
const AssemblyCode::AssemblyType i32 = AssemblyCode::AssemblyType::i32,
i64 = AssemblyCode::AssemblyType::i64,
f32 = AssemblyCode::AssemblyType::f32,
f64 = AssemblyCode::AssemblyType::f64,
null = AssemblyCode::AssemblyType::null;
if (originalCode.assemblyType == null) {
std::cerr
<< "Line " << node.lineNumber << ", Column " << node.columnNumber
<< ", Compiler error: Some part of the compiler attempted to convert \""
<< node.text
<< "\" to \"Decimal64\", which makes no sense. This could be an "
"internal compiler error, or there could be something semantically "
"(though not grammatically) very wrong with your program."
<< std::endl;
exit(1);
}
if (originalCode.assemblyType == i32)
return AssemblyCode("(f64.convert_i32_s\n" +
std::string(originalCode.indentBy(1)) + "\n)",
f64);
if (originalCode.assemblyType == i64)
return AssemblyCode("(f64.convert_i64_s\n" +
std::string(originalCode.indentBy(1)) + "\n)",
f64);
if (originalCode.assemblyType == f32)
return AssemblyCode("(f64.promote_f32\n" +
std::string(originalCode.indentBy(1)) + "\n)",
f64);
if (originalCode.assemblyType == f64)
return originalCode;
std::cerr << "Line " << node.lineNumber << ", Column " << node.columnNumber
<< ", Compiler error: Internal compiler error, control reached the "
"end of the \"convertToDecimal64\" function!"
<< std::endl;
throw std::runtime_error("Logic error in \"convertToDecimal64\"");
return AssemblyCode("()");
}
AssemblyCode convertTo(const TreeNode &node, const std::string &type,
const CompilationContext &context) {
if (type == "Character" or type == "Integer16" or type == "Integer32" or
isPointerType(type)) // When, in JavaScript Virtual Machine, you can't
// push types of less than 4 bytes (32 bits) onto
// the system stack, you need to convert those to
// Integer32 (i32). Well, makes slightly more sense
// than the way it is in 64-bit x86 assembly, where
// you can put 16-bit values and 64-bit values onto
// the system stack, but you can't put 32-bit
// values.
return convertToInteger32(node, context);
if (type == "Integer64")
return convertToInteger64(node, context);
if (type == "Decimal32")
return convertToDecimal32(node, context);
if (type == "Decimal64")
return convertToDecimal64(node, context);
std::cerr << "Line " << node.lineNumber << ", Column " << node.columnNumber
<< ", Compiler error: Some part of the compiler attempted to get "
"the assembly code for converting \""
<< node.text << "\" into the type \"" << type
<< "\", which doesn't make sense. This could be an internal "
"compiler error, or there could be something semantically "
"(though not grammatically) very wrong with your program."
<< std::endl;
exit(-1);
return AssemblyCode("()");
}
AssemblyCode TreeNode::compile(CompilationContext context) const {
std::string typeOfTheCurrentNode = getType(context);
AssemblyCode::AssemblyType returnType;
if (isPointerType(typeOfTheCurrentNode))
returnType = AssemblyCode::AssemblyType::i32;
else {
if (!mappingOfAECTypesToWebAssemblyTypes.count(typeOfTheCurrentNode)) {
std::cerr
<< "Line " << lineNumber << ", Column " << columnNumber
<< ", Internal compiler error: The function \"getType\" returned \""
<< typeOfTheCurrentNode
<< "\", which is an invalid name of type. It's for the node with AST "
<< getLispExpression() << ". Aborting the compilation!" << std::endl;
throw std::runtime_error("Invalid typename!");
}
returnType = mappingOfAECTypesToWebAssemblyTypes.at(typeOfTheCurrentNode);
}
auto iteratorOfTheCurrentFunction =
std::find_if(context.functions.begin(), context.functions.end(),
[=](function someFunction) {
return someFunction.name == context.currentFunctionName;
});
if (iteratorOfTheCurrentFunction == context.functions.end()) {
std::cerr
<< "Line " << lineNumber << ", Column " << columnNumber
<< ", Internal compiler error: The \"compile(CompilationContext)\" "
"function was called without setting the current function name, "
"aborting compilation (or else the compiler will segfault)!"
<< std::endl;
throw std::runtime_error("Context of the compilation is corrupt!");
}
function currentFunction = *iteratorOfTheCurrentFunction;
std::string assembly;
if (text == "Does" or text == "Then" or text == "Loop" or
text == "Else") // Blocks of code are stored by the parser as child nodes
// of "Does", "Then", "Else" and "Loop".
{
if (text != "Does")
context.stackSizeOfThisScope =
0; //"TreeRootNode" is supposed to set up the arguments in the scope
// before passing the recursion onto the "Does" node.
for (auto childNode : children) {
if (childNode.text == "Nothing")
continue;
else if (basicDataTypeSizes.count(childNode.text) ||
isPointerType(childNode.text)) {
// Local variables declaration.
for (TreeNode variableName : childNode.children) {
if (context.variableTypes.count(variableName.text))
std::cerr << "Line " << variableName.lineNumber << ", Column "
<< variableName.columnNumber
<< ", Compiler warning: Variable named \""
<< variableName.text
<< "\" is already visible in this scope (to be of type \""
<< context.variableTypes.at(variableName.text) << "\""
<< (context.placesOfVariableDeclarations.count(
variableName.text)
? (", at the line " +
std::to_string(
context.placesOfVariableDeclarations.at(
variableName.text)))
: "")
<< "), this "
"declaration shadows it."
<< std::endl;
if (variableName.text.back() != '[') { // If it's not an array.
context.localVariables[variableName.text] = 0;
for (auto &pair : context.localVariables)
pair.second += isPointerType(childNode.text)
? 4
: basicDataTypeSizes.at(childNode.text);
context.variableTypes[variableName.text] = childNode.text;
context.placesOfVariableDeclarations[variableName.text] =
variableName.lineNumber;
context.stackSizeOfThisFunction +=
isPointerType(childNode.text)
? 4
: basicDataTypeSizes.at(childNode.text);
context.stackSizeOfThisScope +=
isPointerType(childNode.text)
? 4
: basicDataTypeSizes.at(childNode.text);
assembly +=
"(global.set $stack_pointer\n\t(i32.add (global.get "
"$stack_pointer) (i32.const " +
std::to_string(isPointerType(childNode.text)
? 4
: basicDataTypeSizes.at(childNode.text)) +
")) ;;Allocating the space for the local variable \"" +
variableName.text + "\".\n)\n";
if (variableName.children.size() and
variableName.children[0].text ==
":=") // Initial assignment to local variables.
{
TreeNode assignmentNode = variableName.children[0];
assignmentNode.children.insert(assignmentNode.children.begin(),
variableName);
assembly += assignmentNode.compile(context) + "\n";
}
} else { // If that's a local array declaration.
if (!variableName.children.size()) {
std::cerr << "Line " << variableName.lineNumber << ", Column "
<< variableName.columnNumber
<< ", Compiler error: Corrupt AST, the array named \""
<< variableName.text
<< "\" has no child node indicating size." << std::endl;
exit(1);
}
if (!basicDataTypeSizes.count(childNode.text) &&
!isPointerType(childNode.text)) {
std::cerr << "Line " << variableName.lineNumber << ", Column "
<< variableName.columnNumber
<< ", Compiler error: Corrupt AST, the variable is "
"supposed to be of the type \""
<< childNode.text << "\", but no such type exists."
<< std::endl;
exit(1);
}
int arraySizeInBytes =
(isPointerType(childNode.text)
? 4
: basicDataTypeSizes.at(childNode.text)) *
variableName.children[0]
.interpretAsACompileTimeIntegerConstant();
context.localVariables[variableName.text] = 0;
for (auto &pair : context.localVariables)
pair.second += arraySizeInBytes;
context.variableTypes[variableName.text] = childNode.text;
context.placesOfVariableDeclarations[variableName.text] =
childNode.lineNumber;
context.stackSizeOfThisFunction += arraySizeInBytes;
context.stackSizeOfThisScope += arraySizeInBytes;
assembly += "(global.set $stack_pointer\n\t(i32.add (global.get "
"$stack_pointer) (i32.const " +
std::to_string(arraySizeInBytes) +
")) ;;Allocating the space for the local array \"" +
variableName.text + "\".\n)\n";
if (variableName.children.size() == 2 and
variableName.children[1].text == ":=" and
variableName.children[1].children[0].text ==
"{}") // Initial assignments of local arrays.
{
TreeNode initialisationList =
variableName.children[1].children[0];
for (unsigned int i = 0; i < initialisationList.children.size();
i++) {
TreeNode element = initialisationList.children[i];
TreeNode assignmentNode(
":=", variableName.children[1].lineNumber,
variableName.children[1].columnNumber);
TreeNode whereToAssignTheElement(
variableName.text, variableName.lineNumber,
variableName
.columnNumber); // Damn, can you think up a language in
// which writing stuff like this isn't
// as tedious and error-prone as it is
// in C++ or JavaScript? Maybe some
// language in which you can switch
// between a C-like syntax and a
// Lisp-like syntax at will?
whereToAssignTheElement.children.push_back(TreeNode(
std::to_string(i), variableName.children[0].lineNumber,
variableName.children[1].columnNumber));
assignmentNode.children.push_back(whereToAssignTheElement);
assignmentNode.children.push_back(element);
assembly += assignmentNode.compile(context) + "\n";
}
}
}
}
} else if (childNode.text == "InstantiateStructure") {
if (childNode.children.size() != 1) {
std::cerr << "Line " << childNode.lineNumber << ", Column "
<< childNode.columnNumber
<< ", Compiler error: Corrupt AST, the node "
"\"InstantiateStructure\" should "
"have exactly one child, but it has "
<< childNode.children.size()
<< ". Aborting the compilation!" << std::endl;
exit(1);
}
TreeNode nodeWithStructureName = childNode.children[0];
if (!isValidVariableName(nodeWithStructureName.text) ||
AECkeywords.count(nodeWithStructureName.text) ||
nodeWithStructureName.text.back() == '[') {
std::cerr << "Line " << nodeWithStructureName.lineNumber
<< ", Column " << nodeWithStructureName.columnNumber
<< ", Compiler error: The name \""
<< nodeWithStructureName.text
<< "\" is supposed to be a structure name, but it's not a "
"valid AEC name. Quitting now!"
<< std::endl;
exit(1);
}
auto iteratorPointingToTheStructure =
std::find_if(context.structures.begin(), context.structures.end(),
[=](structure str) {
return str.name == nodeWithStructureName.text;
});
if (iteratorPointingToTheStructure == context.structures.end() &&
!context.structureSizes.count(nodeWithStructureName.text)) {
std::cerr << "Line " << nodeWithStructureName.lineNumber
<< ", Column " << nodeWithStructureName.columnNumber
<< ", Compiler error: The structure named \""
<< nodeWithStructureName.text
<< "\" is not visible in the current scope. Quitting now!"
<< std::endl;
auto most_similar_structure_iterator = std::max_element(
context.structures.begin(), context.structures.end(),
[=](const structure first_potentially_similar_structure,
const structure second_potentially_similar_structure) {
return
#ifndef USING_LEVENSTEIN_DISTANCE
longest_common_subsequence_length(
first_potentially_similar_structure.name,
nodeWithStructureName.text) <
longest_common_subsequence_length(
second_potentially_similar_structure.name,
nodeWithStructureName.text);
#else
Levenstein_distance(
first_potentially_similar_structure.name,
nodeWithStructureName.text) >
Levenstein_distance(
second_potentially_similar_structure.name,
nodeWithStructureName.text);
#endif
});
if (most_similar_structure_iterator != context.structures.end() &&
longest_common_subsequence_length(
most_similar_structure_iterator->name,
nodeWithStructureName.text)) {
std::cerr << "By the way, maybe you meant \""
<< most_similar_structure_iterator->name << "\"?"
<< std::endl;
}
exit(1);
} else if (iteratorPointingToTheStructure == context.structures.end()) {
std::cerr
<< "Line " << nodeWithStructureName.lineNumber << ", Column "
<< nodeWithStructureName.columnNumber
<< ", Internal compiler error: Some part of the compiler has "
"corrupted the compilation context, the structure named \""
<< nodeWithStructureName.text
<< "\" isn't visible, but its size is. Aborting the compilation!"
<< std::endl;
throw std::runtime_error("Corrupt compilation context!");
} else if (!context.structureSizes.count(nodeWithStructureName.text)) {
std::cerr
<< "Line " << nodeWithStructureName.lineNumber << ", Column "
<< nodeWithStructureName.columnNumber
<< ", Internal compiler error: Some part of the compiler has "
"corrupted the compilation context, the structure named \""
<< nodeWithStructureName.text
<< "\" is visible, but its size isn't. Aborting the compilation!"
<< std::endl;
throw std::runtime_error("Corrupt compilation context!");
}
for (TreeNode instanceName : nodeWithStructureName.children) {
if (!isValidVariableName(instanceName.text) ||
AECkeywords.count(instanceName.text)) {
std::cerr << "Line " << instanceName.lineNumber << ", Column "
<< instanceName.columnNumber
<< ", Compiler error: The name \"" << instanceName.text
<< "\" is supposed to be an instance name, but it's not "
<< "a valid AEC name. Quitting now!" << std::endl;
exit(1);
}
context.variableTypes[instanceName.text] =
iteratorPointingToTheStructure->name;
context.placesOfVariableDeclarations[instanceName.text] =
instanceName.lineNumber;
context.localVariables[instanceName.text] = 0;
int arraySizeInBytes = 0, arraySizeInStructures = 0;
if (instanceName.text.back() == '[' &&
instanceName.children.size() == 1) {
arraySizeInStructures =
instanceName.children[0]
.interpretAsACompileTimeIntegerConstant();
arraySizeInBytes = iteratorPointingToTheStructure->sizeInBytes *
arraySizeInStructures;
} else {
if (instanceName.text.back() == '[') {
std::cerr
<< "Line " << instanceName.lineNumber << ", Column "
<< instanceName.columnNumber
<< ", Compiler error: Corrupt AST, the node with text \""
<< instanceName.text
<< "\" is supposed to have 1 child, but it has "
<< instanceName.children.size()
<< ". Aborting the compilation!" << std::endl;
exit(1);
} else {
arraySizeInBytes = iteratorPointingToTheStructure->sizeInBytes;
arraySizeInStructures = 1;
}
}
if (arraySizeInBytes < 1 || arraySizeInStructures < 1) {
std::cerr << "Line " << instanceName.lineNumber << ", Column "
<< instanceName.columnNumber
<< ", Internal compiler error: Some part of the "
"compiler attempted "
"to compile an array with size less than 1, which "
"doesn't make sense. "
"Throwing an exception!"
<< std::endl;
throw std::runtime_error("Compiling an array of negative size!");
}
for (auto bitand pair : context.localVariables)
pair.second += arraySizeInBytes;
context.stackSizeOfThisFunction += arraySizeInBytes;
context.stackSizeOfThisScope += arraySizeInBytes;
assembly +=
"(global.set $stack_pointer\n\t(i32.add (global.get "
"$stack_pointer) (i32.const " +
std::to_string(arraySizeInBytes) +
")) ;;Allocating the space for the local structure instance \"" +
instanceName.text + "\".\n)\n";
// Now we can set the default values. Let's set the members without
// specified default values to 0, this may avoid some bugs.
/*
* TODO: Figure out why the compiler seems to crash whenever compiling
* an instantiation of local nested structure array (see
* "namedArgumentsTest.aec" for more information).
*/
for (int i = 0; i < arraySizeInStructures; i++) {
for (std::string memberName :
iteratorPointingToTheStructure->memberNames) {
if (context.structureSizes.count(
iteratorPointingToTheStructure->memberTypes.at(
memberName))) { // Nested local strucrues.
for (unsigned int k = 0;
k < iteratorPointingToTheStructure->arraySize[memberName];
k++) {
// Let's solve this using S-expressions...
CompilationContext fakeContext =
context; // To avoid the internal compiler error in the
// semantic analyzer.
fakeContext.stackSizeOfThisFunction = 0;
fakeContext.stackSizeOfThisScope = 0;
TreeNode innerStructureNameNode(
"innerStructureInstantiated" +
std::to_string(
std::rand()), // To silence useless warnings about
// supposed variable shadowing.
instanceName.lineNumber, instanceName.columnNumber);
TreeNode innerStructureTypeNode(
iteratorPointingToTheStructure->memberTypes.at(
memberName),
instanceName.lineNumber, instanceName.columnNumber);
innerStructureTypeNode.children.push_back(
innerStructureNameNode);
TreeNode instantiateStructureNode("InstantiateStructure",
instanceName.lineNumber,
instanceName.columnNumber);
instantiateStructureNode.children.push_back(
innerStructureTypeNode);
TreeNode instanceNameNode(instanceName.text,
instanceName.lineNumber,
instanceName.columnNumber);
TreeNode memberNameNode(memberName, instanceName.lineNumber,
instanceName.columnNumber);
TreeNode arrayIndexNode(std::to_string(k),
instanceName.lineNumber,
instanceName.columnNumber);
memberNameNode.children.push_back(arrayIndexNode);
TreeNode dotOperator(".", instanceName.lineNumber,
instanceName.columnNumber);
dotOperator.children = <% instanceNameNode, memberNameNode %>;
TreeNode assignmentOperator(":=", instanceName.lineNumber,
instanceName.columnNumber);
assignmentOperator.children =
<% dotOperator, innerStructureNameNode %>;
TreeNode fakeInnerFunctionNode(
"Does", instanceName.lineNumber,
instanceName
.columnNumber); // Again, to work around the
// hard-to-fix issue in the semantic
// analyzer which causes internal
// compiler errors.
fakeInnerFunctionNode.children =
<% instantiateStructureNode, assignmentOperator %>;
assembly += fakeInnerFunctionNode.compile(fakeContext) + "\n";
}
continue;
}
for (unsigned int k = 0;
k < iteratorPointingToTheStructure->arraySize[memberName];
k++) {
// And now we need to do that daunting task of constructing an
// S-expression in C++ again...
TreeNode nodeRepresentingIndex(std::to_string(i),
instanceName.lineNumber,
instanceName.columnNumber);
TreeNode nodeWithInstanceName(instanceName.text,
instanceName.lineNumber,
instanceName.columnNumber);
nodeWithInstanceName.children.push_back(nodeRepresentingIndex);
TreeNode dotOperator(".", instanceName.lineNumber,
instanceName.columnNumber);
TreeNode nodeWithMemberName(memberName, instanceName.lineNumber,
instanceName.columnNumber);
TreeNode nodeWithMemberArrayIndex(std::to_string(k),
instanceName.lineNumber,
instanceName.columnNumber);
nodeWithMemberName.children.push_back(nodeWithMemberArrayIndex);
dotOperator.children =
<% nodeWithInstanceName,
nodeWithMemberName %>; // Is this valid in standard C++? I
// am not sure. GCC (at least as
// early as 4.8.5) accepts that, and
// so does CLANG 10, and so does
// the C++ compiler that comes with
// Visual Studio 2019.
TreeNode assignmentOperator(":=", instanceName.lineNumber,
instanceName.columnNumber);
TreeNode nodeRepresentendingDefaultValue(
!isPointerType(
iteratorPointingToTheStructure->memberTypes[memberName])
? std::to_string(
iteratorPointingToTheStructure
->defaultValuesOfMembers
[memberName]) // The operator[] of
// std::map returns 0 if we
// try to read a
// non-initialized field.
// That's different from the
// "at(key)" method, which
// throws an exception in
// that case.
: "CharacterPointer(",
instanceName.lineNumber, instanceName.columnNumber);
TreeNode zeroNode("0", instanceName.lineNumber,
instanceName.columnNumber);
nodeRepresentendingDefaultValue.children.push_back(zeroNode);
assignmentOperator.children =
<% dotOperator, nodeRepresentendingDefaultValue %>;
// So, finally, now we can compile that S-expression.
assembly += assignmentOperator.compile(context) + "\n";
}
}
}
if (instanceName.children.size() &&
instanceName.children[0].text ==
":=") // Initial assignment of local structures
{
TreeNode assignmentOperator(
":=", instanceName.children[0].lineNumber,
instanceName.children[0].columnNumber);
TreeNode leftHandSide(instanceName.text, instanceName.lineNumber,
instanceName.columnNumber);
assignmentOperator.children =
<% leftHandSide, instanceName.children[0].children[0] %>;
TreeNode nodeWithFakeDoesToken(
"Does", instanceName.lineNumber,
instanceName.columnNumber); // Let's, for now, avoid the
// Internal Compiler Error in the
// semantic analyzer this way.
nodeWithFakeDoesToken.children.push_back(assignmentOperator);
CompilationContext fakeContext = context;
fakeContext.stackSizeOfThisFunction = 0;
fakeContext.stackSizeOfThisScope = 0;
assembly += nodeWithFakeDoesToken.compile(fakeContext) + "\n";
}
}
} else if (childNode.text == ":=" &&
context.structureSizes.count(
childNode.getType(context))) { // Structure assignments.
std::string structureName = childNode.getType(context);
TreeNode fakeInnerFunctionNode(
"Does", childNode.lineNumber,
childNode
.columnNumber); // Again, to avoid the internal compiler error
// in the semantic analyzer in case of nested
// structures. This isn't an elegant solution,
// but I can't think of any better.
TreeNode instantiateStructureNode("InstantiateStructure",
childNode.lineNumber,
childNode.columnNumber);
TreeNode structureNameNode(structureName, childNode.lineNumber,
childNode.columnNumber);
TreeNode temporaryStructureNode(
"temporaryAssignmentStructure" + std::to_string(rand()),
childNode.lineNumber, childNode.columnNumber);
structureNameNode.children.push_back(temporaryStructureNode);
instantiateStructureNode.children.push_back(structureNameNode);
fakeInnerFunctionNode.children.push_back(instantiateStructureNode);
std::vector<TreeNode> assignmentsToTemporary;
std::vector<TreeNode> assignmentsFromTemporary;
auto iteratorPointingToTheStructure = std::find_if(
context.structures.begin(), context.structures.end(),
[=](structure str) { return str.name == structureName; });
for (std::string memberName :
iteratorPointingToTheStructure->memberNames)
for (unsigned memberArrayIndex = 0;
memberArrayIndex <
iteratorPointingToTheStructure->arraySize.at(memberName);
memberArrayIndex++) {
// For every member of the structure, assume it's an array, so, for
// every element of that array, construct an S-expression for
// assigning the corresponding element of the righ-side structure to
// it, and then compile that S-expression.
TreeNode nodeWithMemberArrayIndex(std::to_string(memberArrayIndex),
childNode.lineNumber,
childNode.columnNumber);
TreeNode nodeWithMemberName(memberName, childNode.lineNumber,
childNode.columnNumber);
nodeWithMemberName.children.push_back(nodeWithMemberArrayIndex);
TreeNode leftDotOperator(".", childNode.lineNumber,
childNode.columnNumber);
leftDotOperator.children =
<% temporaryStructureNode, nodeWithMemberName %>;
TreeNode rightDotOperator(".", childNode.lineNumber,
childNode.columnNumber);
rightDotOperator.children =
<% childNode.children[1], nodeWithMemberName %>;
TreeNode assignmentOperator(":=", childNode.lineNumber,
childNode.columnNumber);
assignmentOperator.children =
<% leftDotOperator, rightDotOperator %>;
assignmentsToTemporary.push_back(assignmentOperator);
leftDotOperator.children =
<% childNode.children[0], nodeWithMemberName %>;
rightDotOperator.children =
<% temporaryStructureNode, nodeWithMemberName %>;
assignmentOperator.children =
<% leftDotOperator, rightDotOperator %>;
assignmentsFromTemporary.push_back(assignmentOperator);
}
fakeInnerFunctionNode.children.insert(
fakeInnerFunctionNode.children.end(),
assignmentsToTemporary.begin(), assignmentsToTemporary.end());
fakeInnerFunctionNode.children.insert(
fakeInnerFunctionNode.children.end(),
assignmentsFromTemporary.begin(), assignmentsFromTemporary.end());
CompilationContext fakeContext = context;
fakeContext.stackSizeOfThisScope = 0;
fakeContext.stackSizeOfThisFunction = 0;
assembly += fakeInnerFunctionNode.compile(fakeContext) + "\n";
} else if ((childNode.text.size() == 2 and childNode.text[1] == '=') or
childNode.getType(context) == "Nothing")
assembly += std::string(childNode.compile(context)) + "\n";
else {
std::cerr
<< "Line " << childNode.lineNumber << ", Column "
<< childNode.columnNumber
<< ", Compiler error: Sorry about that, but WebAssembly doesn't "
"support expressions which aren't assigned to anything (the "
"assembler complains if you write something like that). The "
"compilation is going to be aborted now."
<< std::endl;
std::exit(1);
}
}
assembly += "(global.set $stack_pointer (i32.sub (global.get "
"$stack_pointer) (i32.const " +
std::to_string(context.stackSizeOfThisScope) + ")))";
} else if (text.front() == '"')
assembly += "(i32.const " + std::to_string(context.globalVariables[text]) +
") ;;Pointer to " + text;
else if ((text == "asm(" or text == "asm_i32(" or text == "asm_i64(" or
text == "asm_f32(" or text == "asm_f64(") and
children.size() == 1)
assembly += convertInlineAssemblyToAssembly(children[0]);
else if (text == "nan")
assembly += "(f32.reinterpret_i32\n\t(i32.const -1) ;;IEE754 for "
"not-a-number is 0xffffffff=-1.\n)";
else if (context.variableTypes.count(text) or text == "." || text == "->") {
if (typeOfTheCurrentNode == "Character")
assembly +=
"(i32.load8_s\n" + compileAPointer(context).indentBy(1) + "\n)";
else if (typeOfTheCurrentNode == "Integer16")
assembly +=
"(i32.load16_s\n" + compileAPointer(context).indentBy(1) + "\n)";
else if (typeOfTheCurrentNode == "Integer32" or
isPointerType(typeOfTheCurrentNode))
assembly += "(i32.load\n" + compileAPointer(context).indentBy(1) + "\n)";
else if (typeOfTheCurrentNode == "Integer64")
assembly += "(i64.load\n" + compileAPointer(context).indentBy(1) + "\n)";
else if (typeOfTheCurrentNode == "Decimal32")
assembly += "(f32.load\n" + compileAPointer(context).indentBy(1) + "\n)";
else if (typeOfTheCurrentNode == "Decimal64")
assembly += "(f64.load\n" + compileAPointer(context).indentBy(1) + "\n)";
else {
std::cerr << "Line " << lineNumber << ", Column " << columnNumber
<< ", Internal compiler error: Compiler got into a forbidden "
"state while compiling the token \""
<< text << "\", aborting the compilation!" << std::endl;
throw std::runtime_error("Invalid typename!");
}
} else if (text == ":=") {
TreeNode rightSide;
if (children[1].text == ":=") { // Expressions such as "a:=b:=0" or similar.
TreeNode tmp = children[1]; // In case the "compile" changes the TreeNode.
assembly += children[1].compile(context) + "\n";
rightSide = tmp.children[0];
if (children[1].children[0].getLispExpression() !=
rightSide.getLispExpression())
std::cerr
<< "Line " << lineNumber << ", Column " << columnNumber
<< ", Internal compiler error: It's been detected that some part "
"of the compiler has changed a part of the AST from "
<< rightSide.getLispExpression() << " to "
<< children[1].children[0].getLispExpression()
<< ". This should be impossible. The compilation will continue, "
"but be warned it might produce wrong code because of this."
<< std::endl;
} else
rightSide = children[1];
assembly += ";;Assigning " + rightSide.getLispExpression() + " to " +
children[0].getLispExpression() + ".\n";
if (typeOfTheCurrentNode == "Character")
assembly += "(i32.store8\n" +
children[0].compileAPointer(context).indentBy(1) + "\n" +
convertToInteger32(rightSide, context).indentBy(1) + "\n)";
else if (typeOfTheCurrentNode == "Integer16")
assembly += "(i32.store16\n" +
children[0].compileAPointer(context).indentBy(1) + "\n" +
convertToInteger32(rightSide, context).indentBy(1) + "\n)";
else if (typeOfTheCurrentNode == "Integer32" or
isPointerType(typeOfTheCurrentNode))
assembly += "(i32.store\n" +
children[0].compileAPointer(context).indentBy(1) + "\n" +
convertToInteger32(rightSide, context).indentBy(1) + "\n)";
else if (typeOfTheCurrentNode == "Integer64")
assembly += "(i64.store\n" +
children[0].compileAPointer(context).indentBy(1) + "\n" +
convertToInteger64(rightSide, context).indentBy(1) + "\n)";
else if (typeOfTheCurrentNode == "Decimal32")
assembly += "(f32.store\n" +
children[0].compileAPointer(context).indentBy(1) + "\n" +
convertToDecimal32(rightSide, context).indentBy(1) + "\n)";
else if (typeOfTheCurrentNode == "Decimal64")
assembly += "(f64.store\n" +
children[0].compileAPointer(context).indentBy(1) + "\n" +
convertToDecimal64(rightSide, context).indentBy(1) + "\n)";
else {
std::cerr << "Line " << lineNumber << ", Column " << columnNumber
<< ", Internal compiler error: The compiler got into a "
"forbidden state while compiling the token \""
<< text << "\", aborting the compilation!" << std::endl;
throw std::runtime_error("Invalid name of type!");
}
if (isPointerType(typeOfTheCurrentNode) and
!isPointerType(rightSide.getType(context)))
std::cerr << "Line " << lineNumber << ", Column " << columnNumber
<< ", Compiler warning: You are assigning a type \""
<< rightSide.getType(context)
<< "\" to a pointer, this is likely an error!" << std::endl;
if (!isPointerType(typeOfTheCurrentNode) and
isPointerType(rightSide.getType(context)))
std::cerr
<< "Line " << lineNumber << ", Column " << columnNumber
<< ", Compiler warning: You are assigning a pointer to a type \""
<< typeOfTheCurrentNode << "\", this is likely an error!"
<< std::endl;
} else if (text.size() == 2 and
text[1] ==
'=') // The assignment operators "+=", "-=", "*=" and "/="...
{
TreeNode convertedToSimpleAssignment(":=", lineNumber, columnNumber);
convertedToSimpleAssignment.children.push_back(children[0]);
convertedToSimpleAssignment.children.push_back(*this);
convertedToSimpleAssignment.children[1].text =
convertedToSimpleAssignment.children[1].text.substr(0, 1);
assembly += convertedToSimpleAssignment.compile(context);
} else if (text == "If") {
if (children.size() < 2) {
std::cerr
<< "Line " << lineNumber << ", Column " << columnNumber
<< ", Compiler error: Corrupt AST, the \"If\" node has less than 2 "
"child nodes. Aborting the compilation (or else we will segfault)!"
<< std::endl;
exit(1);
}
if (children[1].text != "Then") {
std::cerr << "Line " << lineNumber << ", Column " << columnNumber
<< ", Compiler error: Corrupt AST, the second child of the "
"\"If\" node isn't named \"Then\". Aborting the compilation "
"(or else we will probably segfault)!"
<< std::endl;
exit(1);
}
if (children.size() >= 3 and children[2].text != "Else") {
std::cerr << "Line " << lineNumber << ", Column " << columnNumber
<< ", Compiler error: Corrupt AST, the third child of the "
"\"If\" node is not named \"Else\", aborting the "
"compilation (or else we will probably segfault)!"
<< std::endl;
exit(1);
}
assembly += "(if\n"
";;Compiling the condition of if-branching: " +
children[0].getLispExpression() + "\n" +
convertToInteger32(children[0], context).indentBy(1) +
"\n\t(then\n" + children[1].compile(context).indentBy(2) +
"\n\t)" +
((children.size() == 3)
? "\n\t(else\n" +
children[2].compile(context).indentBy(2) + "\n\t)\n)"
: AssemblyCode("\n)"));
} else if (text == "While") {
if (children.size() < 2 or children[1].text != "Loop") {
std::cerr << "Line " << lineNumber << ", Column " << columnNumber
<< ", Compiler error: Corrupt AST, aborting (or else we will "
"segfault)!"
<< std::endl;
exit(1);
}
assembly += "(block\n\t(loop\n\t\t(br_if 1\n\t\t\t(i32.eqz\n"
";; Compiling the condition of the while-loop: " +
children[0].getLispExpression() + "\n" +
convertToInteger32(children[0], context).indentBy(4) +
"\n\t\t\t)\n\t\t)\n" +
children[1].compile(context).indentBy(2) +
"\n\t\t(br 0)\n\t)\n)";
} else if (isInteger(text))
assembly += "(i64.const " + text + ")";
else if (isDecimalNumber(text))
assembly += "(f64.const " + text + ")";
else if (text == "Return") {
if (currentFunction.returnType != "Nothing") {
if (children.empty()) {
std::cerr << "Line " << lineNumber << ", Column " << columnNumber
<< ", Compiler error: It's not specified what to return from "
"a function that's supposed to return \""
<< currentFunction.returnType
<< "\", aborting the compilation (or else the compiler will "
"segfault)!"
<< std::endl;
exit(1);
}
TreeNode valueToBeReturned = children[0];
if (valueToBeReturned.text == ":=") {
TreeNode tmp = valueToBeReturned;
assembly += valueToBeReturned.compile(context) + "\n";
if (tmp.getLispExpression() != valueToBeReturned.getLispExpression())
std::cerr << "Line " << lineNumber << ", Column " << columnNumber
<< ", Internal compiler error: Some part of the compiler "
"has changed a part of the AST from "
<< tmp.getLispExpression() << " into "
<< valueToBeReturned.getLispExpression()
<< ", which shouldn't be possible. The compilation will "
"continue, but be warned it might produce wrong code "
"because of this."
<< std::endl;
valueToBeReturned = TreeNode(valueToBeReturned.children[0]);
// https://stackoverflow.com/questions/63951270/using-default-copy-constructor-corrupts-a-tree-in-c
// And I thought C++ didn't have such quirks, typical of
// quickly-designed languages such as JavaScript. The way it behaves
// makes some degree sense when you read the explanation, but it's
// definitely what one would expect, and it leads to hard-to-find bugs.
// Now I see the reason why there are no automatically generated copy
// constructors in Java, C# and JavaScript (there, variables don't hold
// objects but pointers to objects, and, as confusing as it can be at
// first, it can't lead to this kind of problems).
if (tmp.children[0].getLispExpression() !=
valueToBeReturned.getLispExpression()) {
std::cerr << "Line " << lineNumber << ", Column " << columnNumber
<< ", Internal compiler error: Some part of the compiler "
"has changed a part of the AST from "
<< tmp.children[0].getLispExpression() << " into "
<< valueToBeReturned.getLispExpression()
<< ", which shouldn't be possible. The compilation will "
"continue, but be warned it might produce wrong code "
"because of this."
<< std::endl;
valueToBeReturned = tmp.children[0];
}
}
assembly +=
";;Setting for returning: " + valueToBeReturned.getLispExpression() +
"\n";
assembly += "(local.set $return_value\n";
assembly +=
convertTo(valueToBeReturned, currentFunction.returnType, context)
.indentBy(1) +
"\n)\n";