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SymbolTable.h
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SymbolTable.h
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#ifndef _SymbolTable_H
#define _SymbolTable_H
#include <llvm/IR/BasicBlock.h>
#include <iostream>
#include <list>
#include <map>
#include <stack>
class SymbolTableNode
{
public:
llvm::BasicBlock * block;
std::map<std::string, llvm::Value *> localVariables;
SymbolTableNode(llvm::BasicBlock * block) {
this->block = block;
}
~SymbolTableNode() {
}
};
class SymbolTable
{
private:
std::list<SymbolTableNode> table;
std::stack<std::pair<llvm::BasicBlock *, llvm::BasicBlock *>> break_continue_stack;
public:
SymbolTable() {
}
~SymbolTable() {
}
std::map<std::string, llvm::Value *> getLocalVariables() {
return this->table.front().localVariables;
}
void setLocalVariables(std::map<std::string, llvm::Value *> variables) {
this->table.front().localVariables.insert(variables.begin(), variables.end());
}
bool lookupLocalVariables(std::string name) {
auto it = this->getLocalVariables();
return it.find(name) != it.end();
}
void declareLocalVariables(std::string name, llvm::Value * value) {
if (!this->lookupLocalVariables(name)) {
this->table.front().localVariables.insert(std::pair<std::string, llvm::Value *>(name, value));
} else {
std::cerr<<"Variable "<<name<<" already declared";
exit(0);
}
}
bool lookupGlobalVariables(std::string name) {
return this->returnLocalVariables(name) != NULL;
}
llvm::Value * returnLocalVariables(std::string name) {
for (auto it = this->table.begin(); it != this->table.end(); it++) {
auto found_or_end = it->localVariables.find(name);
if (found_or_end != it->localVariables.end()) {
return found_or_end->second;
}
}
return NULL;
}
void pushBlock(llvm::BasicBlock * block) {
this->table.push_front(SymbolTableNode(block));
}
void popBlock() {
this->table.pop_front();
}
llvm::BasicBlock * topBlock() {
for (auto it = this->table.begin(); it != this->table.end(); it++) {
if (it->block) {
return it->block;
}
}
return this->table.front().block;
}
llvm::BasicBlock * bottomBlock() {
return this->table.back().block;
}
void printTable() {
auto i = this->table.front().localVariables;
for (auto it = i.begin() ; it != i.end() ; it++) {
std::cout << it->first;
}
}
void pushBCS(llvm::BasicBlock * breakSt, llvm::BasicBlock * returnSt) {
this->break_continue_stack.push(std::make_pair(breakSt, returnSt));
}
void popBCS() {
this->break_continue_stack.pop();
}
llvm::BasicBlock * getBS() {
if (!this->break_continue_stack.empty()) {
return this->break_continue_stack.top().first;
}
return NULL;
}
llvm::BasicBlock * getCS() {
if (!this->break_continue_stack.empty()) {
return this->break_continue_stack.top().second;
}
return NULL;
}
};
#endif