wraith-lang/compiler.c

675 lines
20 KiB
C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <llvm-c/Core.h>
#include <llvm-c/Analysis.h>
#include <llvm-c/BitWriter.h>
#include "y.tab.h"
#include "ast.h"
#include "stack.h"
extern FILE *yyin;
Stack *stack;
Node *rootNode;
typedef struct LocalVariable
{
char *name;
LLVMValueRef pointer;
} LocalVariable;
typedef struct FunctionArgument
{
char *name;
LLVMValueRef value;
} FunctionArgument;
typedef struct ScopeFrame
{
LocalVariable *localVariables;
uint32_t localVariableCount;
FunctionArgument *arguments;
uint32_t argumentCount;
} ScopeFrame;
typedef struct Scope
{
ScopeFrame *scopeStack;
uint32_t scopeStackCount;
} Scope;
Scope *scope;
typedef struct StructTypeField
{
char *name;
uint32_t index;
} StructTypeField;
typedef struct StructTypeFieldDeclaration
{
LLVMTypeRef structType;
StructTypeField *fields;
uint32_t fieldCount;
} StructTypeFieldDeclaration;
StructTypeFieldDeclaration *structTypeFieldDeclarations;
uint32_t structTypeFieldDeclarationCount;
static Scope* CreateScope()
{
Scope *scope = malloc(sizeof(Scope));
scope->scopeStack = malloc(sizeof(ScopeFrame));
scope->scopeStack[0].argumentCount = 0;
scope->scopeStack[0].arguments = NULL;
scope->scopeStack[0].localVariableCount = 0;
scope->scopeStack[0].localVariables = NULL;
scope->scopeStackCount = 1;
return scope;
}
static void PushScopeFrame(Scope *scope)
{
uint32_t index = scope->scopeStackCount;
scope->scopeStack = realloc(scope->scopeStack, sizeof(ScopeFrame) * (scope->scopeStackCount + 1));
scope->scopeStack[index].argumentCount = 0;
scope->scopeStack[index].arguments = NULL;
scope->scopeStack[index].localVariableCount = 0;
scope->scopeStack[index].localVariables = NULL;
scope->scopeStackCount += 1;
}
static void PopScopeFrame(Scope *scope)
{
uint32_t i;
uint32_t index = scope->scopeStackCount - 1;
if (scope->scopeStack[index].arguments != NULL)
{
for (i = 0; i < scope->scopeStack[index].argumentCount; i += 1)
{
free(scope->scopeStack[index].arguments[i].name);
}
free(scope->scopeStack[index].arguments);
}
if (scope->scopeStack[index].localVariables != NULL)
{
for (i = 0; i < scope->scopeStack[index].localVariableCount; i += 1)
{
free(scope->scopeStack[index].localVariables[i].name);
}
free(scope->scopeStack[index].localVariables);
}
scope->scopeStackCount -= 1;
scope->scopeStack = realloc(scope->scopeStack, sizeof(ScopeFrame) * scope->scopeStackCount);
}
static void AddLocalVariable(Scope *scope, LLVMValueRef pointer, char *name)
{
ScopeFrame *scopeFrame = &scope->scopeStack[scope->scopeStackCount - 1];
uint32_t index = scopeFrame->localVariableCount;
scopeFrame->localVariables = realloc(scopeFrame->localVariables, sizeof(LocalVariable) * (scopeFrame->localVariableCount + 1));
scopeFrame->localVariables[index].name = strdup(name);
scopeFrame->localVariables[index].pointer = pointer;
scopeFrame->localVariableCount += 1;
}
static void AddFunctionArgument(Scope *scope, LLVMValueRef value, char *name)
{
ScopeFrame *scopeFrame = &scope->scopeStack[scope->scopeStackCount - 1];
uint32_t index = scopeFrame->argumentCount;
scopeFrame->arguments = realloc(scopeFrame->arguments, sizeof(FunctionArgument) * (scopeFrame->argumentCount + 1));
scopeFrame->arguments[index].name = strdup(name);
scopeFrame->arguments[index].value = value;
scopeFrame->argumentCount += 1;
}
static LLVMValueRef FindStructFieldPointer(LLVMBuilderRef builder, LLVMValueRef structPointer, char *name)
{
int32_t i, j;
LLVMTypeRef structType = LLVMTypeOf(structPointer);
for (i = 0; i < structTypeFieldDeclarationCount; i += 1)
{
if (structTypeFieldDeclarations[i].structType == structType)
{
for (j = 0; j < structTypeFieldDeclarations[i].fieldCount; j += 1)
{
if (strcmp(structTypeFieldDeclarations[i].fields[j].name, name) == 0)
{
char *ptrName = strdup(name);
strcat(ptrName, "_ptr");
return LLVMBuildStructGEP(
builder,
structPointer,
structTypeFieldDeclarations[i].fields[j].index,
ptrName
);
free(ptrName);
}
}
}
}
printf("Failed to find struct field pointer!");
return NULL;
}
static LLVMValueRef FindVariablePointer(char *name)
{
int32_t i, j;
for (i = scope->scopeStackCount - 1; i >= 0; i -= 1)
{
for (j = 0; j < scope->scopeStack[i].localVariableCount; j += 1)
{
if (strcmp(scope->scopeStack[i].localVariables[j].name, name) == 0)
{
return scope->scopeStack[i].localVariables[j].pointer;
}
}
}
printf("Failed to find variable pointer!");
return NULL;
}
static LLVMValueRef FindVariableValue(LLVMBuilderRef builder, char *name)
{
int32_t i, j;
for (i = scope->scopeStackCount - 1; i >= 0; i -= 1)
{
for (j = 0; j < scope->scopeStack[i].argumentCount; j += 1)
{
if (strcmp(scope->scopeStack[i].arguments[j].name, name) == 0)
{
return scope->scopeStack[i].arguments[j].value;
}
}
for (j = 0; j < scope->scopeStack[i].localVariableCount; j += 1)
{
if (strcmp(scope->scopeStack[i].localVariables[j].name, name) == 0)
{
return LLVMBuildLoad(builder, scope->scopeStack[i].localVariables[j].pointer, name);
}
}
}
printf("Failed to find variable value!");
return NULL;
}
static void AddStructDeclaration(
LLVMTypeRef wStructType,
Node **fieldDeclarations,
uint32_t fieldDeclarationCount
) {
uint32_t i;
uint32_t index = structTypeFieldDeclarationCount;
structTypeFieldDeclarations = realloc(structTypeFieldDeclarations, sizeof(StructTypeFieldDeclaration) * (structTypeFieldDeclarationCount + 1));
structTypeFieldDeclarations[index].structType = wStructType;
structTypeFieldDeclarations[index].fields = NULL;
structTypeFieldDeclarations[index].fieldCount = 0;
for (i = 0; i < fieldDeclarationCount; i += 1)
{
structTypeFieldDeclarations[index].fields = realloc(structTypeFieldDeclarations[index].fields, sizeof(StructTypeField) * (structTypeFieldDeclarations[index].fieldCount + 1));
structTypeFieldDeclarations[index].fields[i].name = strdup(fieldDeclarations[i]->children[1]->value.string);
structTypeFieldDeclarations[index].fields[i].index = i;
structTypeFieldDeclarations[index].fieldCount += 1;
}
structTypeFieldDeclarationCount += 1;
}
static void AddStructVariables(
LLVMBuilderRef builder,
LLVMValueRef structPointer
) {
uint32_t i, j;
for (i = 0; i < structTypeFieldDeclarationCount; i += 1)
{
if (structTypeFieldDeclarations[i].structType == LLVMTypeOf(structPointer))
{
for (j = 0; j < structTypeFieldDeclarations[i].fieldCount; j += 1)
{
LLVMValueRef elementPointer = LLVMBuildStructGEP(
builder,
structPointer,
structTypeFieldDeclarations[i].fields[j].index,
structTypeFieldDeclarations[i].fields[j].name
);
AddLocalVariable(
scope,
elementPointer,
structTypeFieldDeclarations[i].fields[j].name
);
}
}
}
}
static LLVMValueRef CompileExpression(
LLVMValueRef wStructValue,
LLVMBuilderRef builder,
LLVMValueRef function,
Node *binaryExpression
);
typedef struct CustomTypeMap
{
LLVMTypeRef type;
char *name;
} CustomTypeMap;
CustomTypeMap *customTypes;
uint32_t customTypeCount;
static void RegisterCustomType(LLVMTypeRef type, char *name)
{
customTypes = realloc(customTypes, sizeof(CustomType) * (customTypeCount + 1));
customTypes[customTypeCount].type = type;
customTypes[customTypeCount].name = strdup(name);
customTypeCount += 1;
}
static LLVMTypeRef LookupCustomType(char *name)
{
uint32_t i;
for (i = 0; i < customTypeCount; i += 1)
{
if (strcmp(customTypes[i].name, name) == 0)
{
return customTypes[i].type;
}
}
return NULL;
}
static LLVMTypeRef WraithTypeToLLVMType(PrimitiveType type)
{
switch (type)
{
case Int:
return LLVMInt64Type();
case UInt:
return LLVMInt64Type();
case Bool:
return LLVMInt1Type();
case Void:
return LLVMVoidType();
}
fprintf(stderr, "Unrecognized type!");
return NULL;
}
static LLVMValueRef CompileNumber(
Node *numberExpression
) {
return LLVMConstInt(LLVMInt64Type(), numberExpression->value.number, 0);
}
static LLVMValueRef CompileBinaryExpression(
LLVMValueRef wStructValue,
LLVMBuilderRef builder,
LLVMValueRef function,
Node *binaryExpression
) {
LLVMValueRef left = CompileExpression(wStructValue, builder, function, binaryExpression->children[0]);
LLVMValueRef right = CompileExpression(wStructValue, builder, function, binaryExpression->children[1]);
switch (binaryExpression->operator.binaryOperator)
{
case Add:
return LLVMBuildAdd(builder, left, right, "tmp");
case Subtract:
return LLVMBuildSub(builder, left, right, "tmp");
case Multiply:
return LLVMBuildMul(builder, left, right, "tmp");
}
return NULL;
}
/* FIXME THIS IS ALL BROKEN */
static LLVMValueRef CompileFunctionCallExpression(
LLVMValueRef wStructValue,
LLVMBuilderRef builder,
LLVMValueRef function,
Node *expression
) {
uint32_t i;
uint32_t argumentCount = expression->children[1]->childCount;
LLVMValueRef args[argumentCount];
for (i = 0; i < argumentCount; i += 1)
{
args[i] = CompileExpression(wStructValue, builder, function, expression->children[1]->children[i]);
}
//return LLVMBuildCall(builder, FindVariableValueByName(builder, wStructValue, expression->children[0]->value.string), args, argumentCount, "tmp");
return NULL;
}
static LLVMValueRef CompileAccessExpressionForStore(
LLVMBuilderRef builder,
LLVMValueRef wStructValue,
LLVMValueRef function,
Node *expression
) {
Node *accessee = expression->children[0];
Node *accessor = expression->children[1];
LLVMValueRef accesseeValue = FindVariablePointer(accessee->value.string);
return FindStructFieldPointer(builder, accesseeValue, accessor->value.string);
}
static LLVMValueRef CompileAccessExpression(
LLVMBuilderRef builder,
LLVMValueRef wStructValue,
LLVMValueRef function,
Node *expression
) {
Node *accessee = expression->children[0];
Node *accessor = expression->children[1];
LLVMValueRef accesseeValue = FindVariablePointer(accessee->value.string);
LLVMValueRef access = FindStructFieldPointer(builder, accesseeValue, accessor->value.string);
return LLVMBuildLoad(builder, access, accessor->value.string);
}
static LLVMValueRef CompileExpression(
LLVMValueRef wStructValue,
LLVMBuilderRef builder,
LLVMValueRef function,
Node *expression
) {
LLVMValueRef var;
switch (expression->syntaxKind)
{
case AccessExpression:
return CompileAccessExpression(builder, wStructValue, function, expression);
case BinaryExpression:
return CompileBinaryExpression(wStructValue, builder, function, expression);
case FunctionCallExpression:
return CompileFunctionCallExpression(wStructValue, builder, function, expression);
case Identifier:
return FindVariableValue(builder, expression->value.string);
case Number:
return CompileNumber(expression);
}
fprintf(stderr, "Unknown expression kind!\n");
return NULL;
}
/* FIXME: we need a scope structure */
static void CompileReturn(LLVMValueRef wStructValue, LLVMBuilderRef builder, LLVMValueRef function, Node *returnStatemement)
{
uint32_t i, j;
LLVMValueRef expression = CompileExpression(wStructValue, builder, function, returnStatemement->children[0]);
LLVMBuildRet(builder, expression);
}
static void CompileReturnVoid(LLVMBuilderRef builder)
{
LLVMBuildRetVoid(builder);
}
static void CompileAssignment(LLVMValueRef wStructValue, LLVMBuilderRef builder, LLVMValueRef function, Node *assignmentStatement)
{
LLVMValueRef fieldPointer;
LLVMValueRef result = CompileExpression(wStructValue, builder, function, assignmentStatement->children[1]);
LLVMValueRef identifier;
if (assignmentStatement->children[0]->syntaxKind == AccessExpression)
{
identifier = CompileAccessExpressionForStore(builder, wStructValue, function, assignmentStatement->children[0]);
}
else if (assignmentStatement->children[0]->syntaxKind == Identifier)
{
identifier = FindVariablePointer(assignmentStatement->children[0]->value.string);
}
LLVMBuildStore(builder, result, identifier);
}
static void CompileFunctionVariableDeclaration(LLVMBuilderRef builder, Node *variableDeclaration)
{
char *variableName = variableDeclaration->children[1]->value.string;
LLVMValueRef variable;
if (variableDeclaration->children[0]->type == CustomType)
{
char *customTypeName = variableDeclaration->children[0]->children[0]->value.string;
variable = LLVMBuildAlloca(builder, LookupCustomType(customTypeName), variableName);
}
else
{
variable = LLVMBuildAlloca(builder, WraithTypeToLLVMType(variableDeclaration->children[0]->type), variableName);
}
AddLocalVariable(scope, variable, variableName);
}
static uint8_t CompileStatement(LLVMValueRef wStructValue, LLVMBuilderRef builder, LLVMValueRef function, Node *statement)
{
switch (statement->syntaxKind)
{
case Assignment:
CompileAssignment(wStructValue, builder, function, statement);
return 0;
case Declaration:
CompileFunctionVariableDeclaration(builder, statement);
return 0;
case Return:
CompileReturn(wStructValue, builder, function, statement);
return 1;
case ReturnVoid:
CompileReturnVoid(builder);
return 1;
}
fprintf(stderr, "Unknown statement kind!\n");
return 0;
}
static void CompileFunction(
LLVMModuleRef module,
LLVMTypeRef wStructPointerType,
Node **fieldDeclarations,
uint32_t fieldDeclarationCount,
Node *functionDeclaration
) {
uint32_t i;
uint8_t hasReturn = 0;
Node *functionSignature = functionDeclaration->children[0];
Node *functionBody = functionDeclaration->children[1];
uint32_t argumentCount = functionSignature->children[2]->childCount + 1; /* struct is implicit argument */
LLVMTypeRef paramTypes[argumentCount];
PushScopeFrame(scope);
paramTypes[0] = wStructPointerType;
for (i = 0; i < functionSignature->children[2]->childCount; i += 1)
{
paramTypes[i + 1] = WraithTypeToLLVMType(functionSignature->children[2]->children[i]->children[0]->type);
}
LLVMTypeRef returnType = WraithTypeToLLVMType(functionSignature->children[1]->type);
LLVMTypeRef functionType = LLVMFunctionType(returnType, paramTypes, argumentCount, 0);
LLVMValueRef function = LLVMAddFunction(module, functionSignature->children[0]->value.string, functionType);
LLVMBasicBlockRef entry = LLVMAppendBasicBlock(function, "entry");
LLVMBuilderRef builder = LLVMCreateBuilder();
LLVMPositionBuilderAtEnd(builder, entry);
LLVMValueRef wStructPointer = LLVMGetParam(function, 0);
AddStructVariables(builder, wStructPointer);
for (i = 0; i < functionSignature->children[2]->childCount; i += 1)
{
LLVMValueRef argument = LLVMGetParam(function, i + 1);
LLVMValueRef argumentCopy = LLVMBuildAlloca(builder, LLVMTypeOf(argument), functionSignature->children[2]->children[i]->children[1]->value.string);
AddLocalVariable(scope, argumentCopy, functionSignature->children[2]->children[i]->children[1]->value.string);
}
for (i = 0; i < functionBody->childCount; i += 1)
{
hasReturn |= CompileStatement(wStructPointer, builder, function, functionBody->children[i]);
}
if (LLVMGetTypeKind(returnType) == LLVMVoidTypeKind && !hasReturn)
{
LLVMBuildRetVoid(builder);
}
else if (LLVMGetTypeKind(returnType) != LLVMVoidTypeKind && !hasReturn)
{
fprintf(stderr, "Return statement not provided!");
}
PopScopeFrame(scope);
}
static void CompileStruct(LLVMModuleRef module, LLVMContextRef context, Node *node)
{
uint32_t i;
uint32_t fieldCount = 0;
uint32_t declarationCount = node->children[1]->childCount;
uint8_t packed = 1;
LLVMTypeRef types[declarationCount];
Node *currentDeclarationNode;
Node *fieldDeclarations[declarationCount];
PushScopeFrame(scope);
LLVMTypeRef wStruct = LLVMStructCreateNamed(context, node->children[0]->value.string);
LLVMTypeRef wStructPointerType = LLVMPointerType(wStruct, 0); /* FIXME: is this address space correct? */
/* first, build the structure definition */
for (i = 0; i < declarationCount; i += 1)
{
currentDeclarationNode = node->children[1]->children[i];
switch (currentDeclarationNode->syntaxKind)
{
case Declaration: /* this is badly named */
types[fieldCount] = WraithTypeToLLVMType(currentDeclarationNode->children[0]->type);
fieldDeclarations[fieldCount] = currentDeclarationNode;
fieldCount += 1;
break;
}
}
LLVMStructSetBody(wStruct, types, fieldCount, packed);
AddStructDeclaration(wStructPointerType, fieldDeclarations, fieldCount);
RegisterCustomType(wStruct, node->children[0]->value.string);
/* now we can wire up the functions */
for (i = 0; i < declarationCount; i += 1)
{
currentDeclarationNode = node->children[1]->children[i];
switch (currentDeclarationNode->syntaxKind)
{
case FunctionDeclaration:
CompileFunction(module, wStructPointerType, fieldDeclarations, fieldCount, currentDeclarationNode);
break;
}
}
PopScopeFrame(scope);
}
static void Compile(LLVMModuleRef module, LLVMContextRef context, Node *node)
{
uint32_t i;
switch (node->syntaxKind)
{
case StructDeclaration:
CompileStruct(module, context, node);
break;
}
for (i = 0; i < node->childCount; i += 1)
{
Compile(module, context, node->children[i]);
}
}
int main(int argc, char *argv[])
{
if (argc < 2)
{
printf("Please provide a file.\n");
return 1;
}
scope = CreateScope();
structTypeFieldDeclarations = NULL;
structTypeFieldDeclarationCount = 0;
customTypes = NULL;
customTypeCount = 0;
stack = CreateStack();
FILE *fp = fopen(argv[1], "r");
yyin = fp;
yyparse(fp, stack);
fclose(fp);
PrintTree(rootNode, 0);
LLVMModuleRef module = LLVMModuleCreateWithName("my_module");
LLVMContextRef context = LLVMGetGlobalContext();
Compile(module, context, rootNode);
char *error = NULL;
LLVMVerifyModule(module, LLVMAbortProcessAction, &error);
LLVMDisposeMessage(error);
if (LLVMWriteBitcodeToFile(module, "test.bc") != 0) {
fprintf(stderr, "error writing bitcode to file\n");
}
return 0;
}