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@@ -0,0 +1,691 @@
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+#include "llvm/ADT/APFloat.h"
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+#include "llvm/ADT/STLExtras.h"
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+#include "llvm/IR/BasicBlock.h"
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+#include "llvm/IR/Constants.h"
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+#include "llvm/IR/DerivedTypes.h"
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+#include "llvm/IR/Function.h"
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+#include "llvm/IR/IRBuilder.h"
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+#include "llvm/IR/LLVMContext.h"
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+#include "llvm/IR/LegacyPassManager.h"
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+#include "llvm/IR/Module.h"
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+#include "llvm/IR/Type.h"
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+#include "llvm/IR/Verifier.h"
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+#include "llvm/Support/TargetSelect.h"
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+#include "llvm/Target/TargetMachine.h"
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+#include "llvm/Transforms/Scalar.h"
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+#include "llvm/Transforms/Scalar/GVN.h"
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+#include "../include/KaleidoscopeJIT.h"
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+#include <algorithm>
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+#include <cassert>
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+#include <cctype>
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+#include <cstdint>
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+#include <cstdio>
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+#include <cstdlib>
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+#include <map>
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+#include <memory>
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+#include <string>
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+#include <vector>
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+
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+using namespace llvm;
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+using namespace llvm::orc;
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+
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+//===----------------------------------------------------------------------===//
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+// Lexer
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+//===----------------------------------------------------------------------===//
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+
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+// The lexer returns tokens [0-255] if it is an unknown character, otherwise one
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+// of these for known things.
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+enum Token {
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+ tok_eof = -1,
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+
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+ // commands
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+ tok_def = -2,
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+ tok_extern = -3,
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+
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+ // primary
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+ tok_identifier = -4,
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+ tok_number = -5
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+};
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+
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+static std::string IdentifierStr; // Filled in if tok_identifier
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+static double NumVal; // Filled in if tok_number
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+
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+/// gettok - Return the next token from standard input.
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+static int gettok() {
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+ static int LastChar = ' ';
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+
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+ // Skip any whitespace.
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+ while (isspace(LastChar))
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+ LastChar = getchar();
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+
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+ if (isalpha(LastChar)) { // identifier: [a-zA-Z][a-zA-Z0-9]*
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+ IdentifierStr = LastChar;
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+ while (isalnum((LastChar = getchar())))
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+ IdentifierStr += LastChar;
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+
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+ if (IdentifierStr == "def")
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+ return tok_def;
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+ if (IdentifierStr == "extern")
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+ return tok_extern;
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+ return tok_identifier;
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+ }
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+
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+ if (isdigit(LastChar) || LastChar == '.') { // Number: [0-9.]+
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+ std::string NumStr;
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+ do {
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+ NumStr += LastChar;
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+ LastChar = getchar();
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+ } while (isdigit(LastChar) || LastChar == '.');
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+
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+ NumVal = strtod(NumStr.c_str(), nullptr);
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+ return tok_number;
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+ }
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+
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+ if (LastChar == '#') {
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+ // Comment until end of line.
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+ do
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+ LastChar = getchar();
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+ while (LastChar != EOF && LastChar != '\n' && LastChar != '\r');
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+
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+ if (LastChar != EOF)
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+ return gettok();
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+ }
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+
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+ // Check for end of file. Don't eat the EOF.
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+ if (LastChar == EOF)
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+ return tok_eof;
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+
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+ // Otherwise, just return the character as its ascii value.
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+ int ThisChar = LastChar;
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+ LastChar = getchar();
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+ return ThisChar;
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+}
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+
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+//===----------------------------------------------------------------------===//
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+// Abstract Syntax Tree (aka Parse Tree)
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+//===----------------------------------------------------------------------===//
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+
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+namespace {
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+
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+/// ExprAST - Base class for all expression nodes.
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+class ExprAST {
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+public:
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+ virtual ~ExprAST() = default;
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+
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+ virtual Value *codegen() = 0;
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+};
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+
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+/// NumberExprAST - Expression class for numeric literals like "1.0".
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+class NumberExprAST : public ExprAST {
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+ double Val;
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+
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+public:
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+ NumberExprAST(double Val) : Val(Val) {}
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+
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+ Value *codegen() override;
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+};
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+
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+/// VariableExprAST - Expression class for referencing a variable, like "a".
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+class VariableExprAST : public ExprAST {
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+ std::string Name;
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+
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+public:
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+ VariableExprAST(const std::string &Name) : Name(Name) {}
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+
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+ Value *codegen() override;
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+};
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+
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+/// BinaryExprAST - Expression class for a binary operator.
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+class BinaryExprAST : public ExprAST {
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+ char Op;
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+ std::unique_ptr<ExprAST> LHS, RHS;
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+
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+public:
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+ BinaryExprAST(char Op, std::unique_ptr<ExprAST> LHS,
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+ std::unique_ptr<ExprAST> RHS)
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+ : Op(Op), LHS(std::move(LHS)), RHS(std::move(RHS)) {}
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+
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+ Value *codegen() override;
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+};
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+
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+/// CallExprAST - Expression class for function calls.
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+class CallExprAST : public ExprAST {
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+ std::string Callee;
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+ std::vector<std::unique_ptr<ExprAST>> Args;
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+
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+public:
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+ CallExprAST(const std::string &Callee,
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+ std::vector<std::unique_ptr<ExprAST>> Args)
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+ : Callee(Callee), Args(std::move(Args)) {}
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+
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+ Value *codegen() override;
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+};
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+
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+/// PrototypeAST - This class represents the "prototype" for a function,
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+/// which captures its name, and its argument names (thus implicitly the number
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+/// of arguments the function takes).
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+class PrototypeAST {
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+ std::string Name;
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+ std::vector<std::string> Args;
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+
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+public:
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+ PrototypeAST(const std::string &Name, std::vector<std::string> Args)
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+ : Name(Name), Args(std::move(Args)) {}
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+
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+ Function *codegen();
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+ const std::string &getName() const { return Name; }
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+};
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+
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+/// FunctionAST - This class represents a function definition itself.
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+class FunctionAST {
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+ std::unique_ptr<PrototypeAST> Proto;
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+ std::unique_ptr<ExprAST> Body;
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+
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+public:
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+ FunctionAST(std::unique_ptr<PrototypeAST> Proto,
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+ std::unique_ptr<ExprAST> Body)
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+ : Proto(std::move(Proto)), Body(std::move(Body)) {}
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+
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+ Function *codegen();
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+};
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+
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+} // end anonymous namespace
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+
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+//===----------------------------------------------------------------------===//
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+// Parser
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+//===----------------------------------------------------------------------===//
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+
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+/// CurTok/getNextToken - Provide a simple token buffer. CurTok is the current
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+/// token the parser is looking at. getNextToken reads another token from the
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+/// lexer and updates CurTok with its results.
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+static int CurTok;
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+static int getNextToken() { return CurTok = gettok(); }
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+
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+/// BinopPrecedence - This holds the precedence for each binary operator that is
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+/// defined.
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+static std::map<char, int> BinopPrecedence;
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+
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+/// GetTokPrecedence - Get the precedence of the pending binary operator token.
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+static int GetTokPrecedence() {
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+ if (!isascii(CurTok))
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+ return -1;
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+
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+ // Make sure it's a declared binop.
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+ int TokPrec = BinopPrecedence[CurTok];
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+ if (TokPrec <= 0)
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+ return -1;
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+ return TokPrec;
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+}
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+
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+/// LogError* - These are little helper functions for error handling.
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+std::unique_ptr<ExprAST> LogError(const char *Str) {
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+ fprintf(stderr, "Error: %s\n", Str);
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+ return nullptr;
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+}
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+
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+std::unique_ptr<PrototypeAST> LogErrorP(const char *Str) {
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+ LogError(Str);
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+ return nullptr;
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+}
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+
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+static std::unique_ptr<ExprAST> ParseExpression();
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+
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+/// numberexpr ::= number
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+static std::unique_ptr<ExprAST> ParseNumberExpr() {
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+ auto Result = llvm::make_unique<NumberExprAST>(NumVal);
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+ getNextToken(); // consume the number
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+ return std::move(Result);
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+}
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+
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+/// parenexpr ::= '(' expression ')'
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+static std::unique_ptr<ExprAST> ParseParenExpr() {
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+ getNextToken(); // eat (.
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+ auto V = ParseExpression();
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+ if (!V)
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+ return nullptr;
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+
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+ if (CurTok != ')')
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+ return LogError("expected ')'");
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+ getNextToken(); // eat ).
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+ return V;
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+}
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+
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+/// identifierexpr
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+/// ::= identifier
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+/// ::= identifier '(' expression* ')'
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+static std::unique_ptr<ExprAST> ParseIdentifierExpr() {
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+ std::string IdName = IdentifierStr;
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+
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+ getNextToken(); // eat identifier.
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+
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+ if (CurTok != '(') // Simple variable ref.
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+ return llvm::make_unique<VariableExprAST>(IdName);
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+
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+ // Call.
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+ getNextToken(); // eat (
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+ std::vector<std::unique_ptr<ExprAST>> Args;
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+ if (CurTok != ')') {
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+ while (true) {
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+ if (auto Arg = ParseExpression())
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+ Args.push_back(std::move(Arg));
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+ else
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+ return nullptr;
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+
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+ if (CurTok == ')')
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+ break;
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+
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+ if (CurTok != ',')
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+ return LogError("Expected ')' or ',' in argument list");
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+ getNextToken();
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+ }
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+ }
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+
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+ // Eat the ')'.
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+ getNextToken();
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+
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+ return llvm::make_unique<CallExprAST>(IdName, std::move(Args));
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+}
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+
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+/// primary
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+/// ::= identifierexpr
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+/// ::= numberexpr
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+/// ::= parenexpr
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+static std::unique_ptr<ExprAST> ParsePrimary() {
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+ switch (CurTok) {
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+ default:
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+ return LogError("unknown token when expecting an expression");
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+ case tok_identifier:
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+ return ParseIdentifierExpr();
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+ case tok_number:
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+ return ParseNumberExpr();
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+ case '(':
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+ return ParseParenExpr();
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+ }
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+}
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+
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+/// binoprhs
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+/// ::= ('+' primary)*
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+static std::unique_ptr<ExprAST> ParseBinOpRHS(int ExprPrec,
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+ std::unique_ptr<ExprAST> LHS) {
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+ // If this is a binop, find its precedence.
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+ while (true) {
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+ int TokPrec = GetTokPrecedence();
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+
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+ // If this is a binop that binds at least as tightly as the current binop,
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+ // consume it, otherwise we are done.
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+ if (TokPrec < ExprPrec)
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+ return LHS;
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+
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+ // Okay, we know this is a binop.
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+ int BinOp = CurTok;
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+ getNextToken(); // eat binop
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+
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+ // Parse the primary expression after the binary operator.
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+ auto RHS = ParsePrimary();
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+ if (!RHS)
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+ return nullptr;
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+
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+ // If BinOp binds less tightly with RHS than the operator after RHS, let
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+ // the pending operator take RHS as its LHS.
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+ int NextPrec = GetTokPrecedence();
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+ if (TokPrec < NextPrec) {
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+ RHS = ParseBinOpRHS(TokPrec + 1, std::move(RHS));
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+ if (!RHS)
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+ return nullptr;
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+ }
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+
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+ // Merge LHS/RHS.
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+ LHS =
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+ llvm::make_unique<BinaryExprAST>(BinOp, std::move(LHS), std::move(RHS));
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+ }
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+}
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+
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+/// expression
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+/// ::= primary binoprhs
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+///
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+static std::unique_ptr<ExprAST> ParseExpression() {
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+ auto LHS = ParsePrimary();
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+ if (!LHS)
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+ return nullptr;
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+
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+ return ParseBinOpRHS(0, std::move(LHS));
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+}
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+
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+/// prototype
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+/// ::= id '(' id* ')'
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+static std::unique_ptr<PrototypeAST> ParsePrototype() {
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+ if (CurTok != tok_identifier)
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+ return LogErrorP("Expected function name in prototype");
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+
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+ std::string FnName = IdentifierStr;
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+ getNextToken();
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+
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+ if (CurTok != '(')
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+ return LogErrorP("Expected '(' in prototype");
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+
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+ std::vector<std::string> ArgNames;
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+ while (getNextToken() == tok_identifier)
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+ ArgNames.push_back(IdentifierStr);
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+ if (CurTok != ')')
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+ return LogErrorP("Expected ')' in prototype");
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+
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+ // success.
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+ getNextToken(); // eat ')'.
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+
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+ return llvm::make_unique<PrototypeAST>(FnName, std::move(ArgNames));
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+}
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+
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+/// definition ::= 'def' prototype expression
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+static std::unique_ptr<FunctionAST> ParseDefinition() {
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+ getNextToken(); // eat def.
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+ auto Proto = ParsePrototype();
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+ if (!Proto)
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+ return nullptr;
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+
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+ if (auto E = ParseExpression())
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+ return llvm::make_unique<FunctionAST>(std::move(Proto), std::move(E));
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+ return nullptr;
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+}
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+
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+/// toplevelexpr ::= expression
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+static std::unique_ptr<FunctionAST> ParseTopLevelExpr() {
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+ if (auto E = ParseExpression()) {
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+ // Make an anonymous proto.
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+ auto Proto = llvm::make_unique<PrototypeAST>("__anon_expr",
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+ std::vector<std::string>());
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+ return llvm::make_unique<FunctionAST>(std::move(Proto), std::move(E));
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+ }
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+ return nullptr;
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+}
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+
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+/// external ::= 'extern' prototype
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+static std::unique_ptr<PrototypeAST> ParseExtern() {
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+ getNextToken(); // eat extern.
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+ return ParsePrototype();
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+}
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+
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+//===----------------------------------------------------------------------===//
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+// Code Generation
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+//===----------------------------------------------------------------------===//
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+
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+static LLVMContext TheContext;
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+static IRBuilder<> Builder(TheContext);
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+static std::unique_ptr<Module> TheModule;
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+static std::map<std::string, Value *> NamedValues;
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+static std::unique_ptr<legacy::FunctionPassManager> TheFPM;
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+static std::unique_ptr<KaleidoscopeJIT> TheJIT;
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+static std::map<std::string, std::unique_ptr<PrototypeAST>> FunctionProtos;
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+
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+Value *LogErrorV(const char *Str) {
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+ LogError(Str);
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+ return nullptr;
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+}
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+
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+Function *getFunction(std::string Name) {
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+ // First, see if the function has already been added to the current module.
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+ if (auto *F = TheModule->getFunction(Name))
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+ return F;
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+
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+ // If not, check whether we can codegen the declaration from some existing
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+ // prototype.
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+ auto FI = FunctionProtos.find(Name);
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+ if (FI != FunctionProtos.end())
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+ return FI->second->codegen();
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|
+
|
|
|
+ // If no existing prototype exists, return null.
|
|
|
+ return nullptr;
|
|
|
+}
|
|
|
+
|
|
|
+Value *NumberExprAST::codegen() {
|
|
|
+ return ConstantFP::get(TheContext, APFloat(Val));
|
|
|
+}
|
|
|
+
|
|
|
+Value *VariableExprAST::codegen() {
|
|
|
+ // Look this variable up in the function.
|
|
|
+ Value *V = NamedValues[Name];
|
|
|
+ if (!V)
|
|
|
+ return LogErrorV("Unknown variable name");
|
|
|
+ return V;
|
|
|
+}
|
|
|
+
|
|
|
+Value *BinaryExprAST::codegen() {
|
|
|
+ Value *L = LHS->codegen();
|
|
|
+ Value *R = RHS->codegen();
|
|
|
+ if (!L || !R)
|
|
|
+ return nullptr;
|
|
|
+
|
|
|
+ switch (Op) {
|
|
|
+ case '+':
|
|
|
+ return Builder.CreateFAdd(L, R, "addtmp");
|
|
|
+ case '-':
|
|
|
+ return Builder.CreateFSub(L, R, "subtmp");
|
|
|
+ case '*':
|
|
|
+ return Builder.CreateFMul(L, R, "multmp");
|
|
|
+ case '<':
|
|
|
+ L = Builder.CreateFCmpULT(L, R, "cmptmp");
|
|
|
+ // Convert bool 0/1 to double 0.0 or 1.0
|
|
|
+ return Builder.CreateUIToFP(L, Type::getDoubleTy(TheContext), "booltmp");
|
|
|
+ default:
|
|
|
+ return LogErrorV("invalid binary operator");
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+Value *CallExprAST::codegen() {
|
|
|
+ // Look up the name in the global module table.
|
|
|
+ Function *CalleeF = getFunction(Callee);
|
|
|
+ if (!CalleeF)
|
|
|
+ return LogErrorV("Unknown function referenced");
|
|
|
+
|
|
|
+ // If argument mismatch error.
|
|
|
+ if (CalleeF->arg_size() != Args.size())
|
|
|
+ return LogErrorV("Incorrect # arguments passed");
|
|
|
+
|
|
|
+ std::vector<Value *> ArgsV;
|
|
|
+ for (unsigned i = 0, e = Args.size(); i != e; ++i) {
|
|
|
+ ArgsV.push_back(Args[i]->codegen());
|
|
|
+ if (!ArgsV.back())
|
|
|
+ return nullptr;
|
|
|
+ }
|
|
|
+
|
|
|
+ return Builder.CreateCall(CalleeF, ArgsV, "calltmp");
|
|
|
+}
|
|
|
+
|
|
|
+Function *PrototypeAST::codegen() {
|
|
|
+ // Make the function type: double(double,double) etc.
|
|
|
+ std::vector<Type *> Doubles(Args.size(), Type::getDoubleTy(TheContext));
|
|
|
+ FunctionType *FT =
|
|
|
+ FunctionType::get(Type::getDoubleTy(TheContext), Doubles, false);
|
|
|
+
|
|
|
+ Function *F =
|
|
|
+ Function::Create(FT, Function::ExternalLinkage, Name, TheModule.get());
|
|
|
+
|
|
|
+ // Set names for all arguments.
|
|
|
+ unsigned Idx = 0;
|
|
|
+ for (auto &Arg : F->args())
|
|
|
+ Arg.setName(Args[Idx++]);
|
|
|
+
|
|
|
+ return F;
|
|
|
+}
|
|
|
+
|
|
|
+Function *FunctionAST::codegen() {
|
|
|
+ // Transfer ownership of the prototype to the FunctionProtos map, but keep a
|
|
|
+ // reference to it for use below.
|
|
|
+ auto &P = *Proto;
|
|
|
+ FunctionProtos[Proto->getName()] = std::move(Proto);
|
|
|
+ Function *TheFunction = getFunction(P.getName());
|
|
|
+ if (!TheFunction)
|
|
|
+ return nullptr;
|
|
|
+
|
|
|
+ // Create a new basic block to start insertion into.
|
|
|
+ BasicBlock *BB = BasicBlock::Create(TheContext, "entry", TheFunction);
|
|
|
+ Builder.SetInsertPoint(BB);
|
|
|
+
|
|
|
+ // Record the function arguments in the NamedValues map.
|
|
|
+ NamedValues.clear();
|
|
|
+ for (auto &Arg : TheFunction->args())
|
|
|
+ NamedValues[Arg.getName()] = &Arg;
|
|
|
+
|
|
|
+ if (Value *RetVal = Body->codegen()) {
|
|
|
+ // Finish off the function.
|
|
|
+ Builder.CreateRet(RetVal);
|
|
|
+
|
|
|
+ // Validate the generated code, checking for consistency.
|
|
|
+ verifyFunction(*TheFunction);
|
|
|
+
|
|
|
+ // Run the optimizer on the function.
|
|
|
+ TheFPM->run(*TheFunction);
|
|
|
+
|
|
|
+ return TheFunction;
|
|
|
+ }
|
|
|
+
|
|
|
+ // Error reading body, remove function.
|
|
|
+ TheFunction->eraseFromParent();
|
|
|
+ return nullptr;
|
|
|
+}
|
|
|
+
|
|
|
+//===----------------------------------------------------------------------===//
|
|
|
+// Top-Level parsing and JIT Driver
|
|
|
+//===----------------------------------------------------------------------===//
|
|
|
+
|
|
|
+static void InitializeModuleAndPassManager() {
|
|
|
+ // Open a new module.
|
|
|
+ TheModule = llvm::make_unique<Module>("my cool jit", TheContext);
|
|
|
+ TheModule->setDataLayout(TheJIT->getTargetMachine().createDataLayout());
|
|
|
+
|
|
|
+ // Create a new pass manager attached to it.
|
|
|
+ TheFPM = llvm::make_unique<legacy::FunctionPassManager>(TheModule.get());
|
|
|
+
|
|
|
+ // Do simple "peephole" optimizations and bit-twiddling optzns.
|
|
|
+ TheFPM->add(createInstructionCombiningPass());
|
|
|
+ // Reassociate expressions.
|
|
|
+ TheFPM->add(createReassociatePass());
|
|
|
+ // Eliminate Common SubExpressions.
|
|
|
+ TheFPM->add(createGVNPass());
|
|
|
+ // Simplify the control flow graph (deleting unreachable blocks, etc).
|
|
|
+ TheFPM->add(createCFGSimplificationPass());
|
|
|
+
|
|
|
+ TheFPM->doInitialization();
|
|
|
+}
|
|
|
+
|
|
|
+static void HandleDefinition() {
|
|
|
+ if (auto FnAST = ParseDefinition()) {
|
|
|
+ if (auto *FnIR = FnAST->codegen()) {
|
|
|
+ fprintf(stderr, "Read function definition:");
|
|
|
+ FnIR->dump();
|
|
|
+ TheJIT->addModule(std::move(TheModule));
|
|
|
+ InitializeModuleAndPassManager();
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ // Skip token for error recovery.
|
|
|
+ getNextToken();
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static void HandleExtern() {
|
|
|
+ if (auto ProtoAST = ParseExtern()) {
|
|
|
+ if (auto *FnIR = ProtoAST->codegen()) {
|
|
|
+ fprintf(stderr, "Read extern: ");
|
|
|
+ FnIR->dump();
|
|
|
+ FunctionProtos[ProtoAST->getName()] = std::move(ProtoAST);
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ // Skip token for error recovery.
|
|
|
+ getNextToken();
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static void HandleTopLevelExpression() {
|
|
|
+ // Evaluate a top-level expression into an anonymous function.
|
|
|
+ if (auto FnAST = ParseTopLevelExpr()) {
|
|
|
+ if (FnAST->codegen()) {
|
|
|
+ // JIT the module containing the anonymous expression, keeping a handle so
|
|
|
+ // we can free it later.
|
|
|
+ auto H = TheJIT->addModule(std::move(TheModule));
|
|
|
+ InitializeModuleAndPassManager();
|
|
|
+
|
|
|
+ // Search the JIT for the __anon_expr symbol.
|
|
|
+ auto ExprSymbol = TheJIT->findSymbol("__anon_expr");
|
|
|
+ assert(ExprSymbol && "Function not found");
|
|
|
+
|
|
|
+ // Get the symbol's address and cast it to the right type (takes no
|
|
|
+ // arguments, returns a double) so we can call it as a native function.
|
|
|
+ double (*FP)() = (double (*)())(intptr_t)ExprSymbol.getAddress();
|
|
|
+ fprintf(stderr, "Evaluated to %f\n", FP());
|
|
|
+
|
|
|
+ // Delete the anonymous expression module from the JIT.
|
|
|
+ TheJIT->removeModule(H);
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ // Skip token for error recovery.
|
|
|
+ getNextToken();
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/// top ::= definition | external | expression | ';'
|
|
|
+static void MainLoop() {
|
|
|
+ while (true) {
|
|
|
+ fprintf(stderr, "ready> ");
|
|
|
+ switch (CurTok) {
|
|
|
+ case tok_eof:
|
|
|
+ return;
|
|
|
+ case ';': // ignore top-level semicolons.
|
|
|
+ getNextToken();
|
|
|
+ break;
|
|
|
+ case tok_def:
|
|
|
+ HandleDefinition();
|
|
|
+ break;
|
|
|
+ case tok_extern:
|
|
|
+ HandleExtern();
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ HandleTopLevelExpression();
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+//===----------------------------------------------------------------------===//
|
|
|
+// "Library" functions that can be "extern'd" from user code.
|
|
|
+//===----------------------------------------------------------------------===//
|
|
|
+
|
|
|
+/// putchard - putchar that takes a double and returns 0.
|
|
|
+extern "C" double putchard(double X) {
|
|
|
+ fputc((char)X, stderr);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/// printd - printf that takes a double prints it as "%f\n", returning 0.
|
|
|
+extern "C" double printd(double X) {
|
|
|
+ fprintf(stderr, "%f\n", X);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+//===----------------------------------------------------------------------===//
|
|
|
+// Main driver code.
|
|
|
+//===----------------------------------------------------------------------===//
|
|
|
+
|
|
|
+int main() {
|
|
|
+ InitializeNativeTarget();
|
|
|
+ InitializeNativeTargetAsmPrinter();
|
|
|
+ InitializeNativeTargetAsmParser();
|
|
|
+
|
|
|
+ // Install standard binary operators.
|
|
|
+ // 1 is lowest precedence.
|
|
|
+ BinopPrecedence['<'] = 10;
|
|
|
+ BinopPrecedence['+'] = 20;
|
|
|
+ BinopPrecedence['-'] = 20;
|
|
|
+ BinopPrecedence['*'] = 40; // highest.
|
|
|
+
|
|
|
+ // Prime the first token.
|
|
|
+ fprintf(stderr, "ready> ");
|
|
|
+ getNextToken();
|
|
|
+
|
|
|
+ TheJIT = llvm::make_unique<KaleidoscopeJIT>();
|
|
|
+
|
|
|
+ InitializeModuleAndPassManager();
|
|
|
+
|
|
|
+ // Run the main "interpreter loop" now.
|
|
|
+ MainLoop();
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
