forked from OSchip/llvm-project
1136 lines
32 KiB
C++
1136 lines
32 KiB
C++
#include "llvm/DerivedTypes.h"
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#include "llvm/ExecutionEngine/ExecutionEngine.h"
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#include "llvm/Module.h"
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#include "llvm/ModuleProvider.h"
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#include "llvm/PassManager.h"
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#include "llvm/Analysis/Verifier.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Support/IRBuilder.h"
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#include <cstdio>
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#include <string>
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#include <map>
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#include <vector>
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Lexer
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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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// commands
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tok_def = -2, tok_extern = -3,
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// primary
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tok_identifier = -4, tok_number = -5,
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// control
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tok_if = -6, tok_then = -7, tok_else = -8,
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tok_for = -9, tok_in = -10,
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// operators
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tok_binary = -11, tok_unary = -12,
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// var definition
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tok_var = -13
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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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/// 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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// Skip any whitespace.
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while (isspace(LastChar))
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LastChar = getchar();
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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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if (IdentifierStr == "def") return tok_def;
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if (IdentifierStr == "extern") return tok_extern;
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if (IdentifierStr == "if") return tok_if;
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if (IdentifierStr == "then") return tok_then;
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if (IdentifierStr == "else") return tok_else;
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if (IdentifierStr == "for") return tok_for;
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if (IdentifierStr == "in") return tok_in;
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if (IdentifierStr == "binary") return tok_binary;
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if (IdentifierStr == "unary") return tok_unary;
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if (IdentifierStr == "var") return tok_var;
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return tok_identifier;
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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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NumVal = strtod(NumStr.c_str(), 0);
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return tok_number;
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}
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if (LastChar == '#') {
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// Comment until end of line.
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do LastChar = getchar();
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while (LastChar != EOF && LastChar != '\n' && LastChar != '\r');
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if (LastChar != EOF)
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return gettok();
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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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// 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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// Abstract Syntax Tree (aka Parse Tree)
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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() {}
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virtual Value *Codegen() = 0;
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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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public:
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NumberExprAST(double val) : Val(val) {}
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virtual Value *Codegen();
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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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public:
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VariableExprAST(const std::string &name) : Name(name) {}
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const std::string &getName() const { return Name; }
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virtual Value *Codegen();
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};
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/// UnaryExprAST - Expression class for a unary operator.
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class UnaryExprAST : public ExprAST {
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char Opcode;
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ExprAST *Operand;
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public:
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UnaryExprAST(char opcode, ExprAST *operand)
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: Opcode(opcode), Operand(operand) {}
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virtual Value *Codegen();
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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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ExprAST *LHS, *RHS;
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public:
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BinaryExprAST(char op, ExprAST *lhs, ExprAST *rhs)
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: Op(op), LHS(lhs), RHS(rhs) {}
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virtual Value *Codegen();
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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<ExprAST*> Args;
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public:
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CallExprAST(const std::string &callee, std::vector<ExprAST*> &args)
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: Callee(callee), Args(args) {}
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virtual Value *Codegen();
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};
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/// IfExprAST - Expression class for if/then/else.
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class IfExprAST : public ExprAST {
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ExprAST *Cond, *Then, *Else;
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public:
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IfExprAST(ExprAST *cond, ExprAST *then, ExprAST *_else)
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: Cond(cond), Then(then), Else(_else) {}
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virtual Value *Codegen();
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};
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/// ForExprAST - Expression class for for/in.
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class ForExprAST : public ExprAST {
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std::string VarName;
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ExprAST *Start, *End, *Step, *Body;
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public:
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ForExprAST(const std::string &varname, ExprAST *start, ExprAST *end,
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ExprAST *step, ExprAST *body)
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: VarName(varname), Start(start), End(end), Step(step), Body(body) {}
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virtual Value *Codegen();
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};
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/// VarExprAST - Expression class for var/in
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class VarExprAST : public ExprAST {
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std::vector<std::pair<std::string, ExprAST*> > VarNames;
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ExprAST *Body;
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public:
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VarExprAST(const std::vector<std::pair<std::string, ExprAST*> > &varnames,
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ExprAST *body)
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: VarNames(varnames), Body(body) {}
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virtual Value *Codegen();
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};
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/// PrototypeAST - This class represents the "prototype" for a function,
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/// which captures its argument names as well as if it is an operator.
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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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bool isOperator;
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unsigned Precedence; // Precedence if a binary op.
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public:
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PrototypeAST(const std::string &name, const std::vector<std::string> &args,
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bool isoperator = false, unsigned prec = 0)
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: Name(name), Args(args), isOperator(isoperator), Precedence(prec) {}
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bool isUnaryOp() const { return isOperator && Args.size() == 1; }
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bool isBinaryOp() const { return isOperator && Args.size() == 2; }
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char getOperatorName() const {
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assert(isUnaryOp() || isBinaryOp());
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return Name[Name.size()-1];
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}
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unsigned getBinaryPrecedence() const { return Precedence; }
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Function *Codegen();
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void CreateArgumentAllocas(Function *F);
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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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PrototypeAST *Proto;
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ExprAST *Body;
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public:
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FunctionAST(PrototypeAST *proto, ExprAST *body)
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: Proto(proto), Body(body) {}
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Function *Codegen();
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};
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//===----------------------------------------------------------------------===//
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// Parser
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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 it 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() {
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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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/// 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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// Make sure it's a declared binop.
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int TokPrec = BinopPrecedence[CurTok];
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if (TokPrec <= 0) return -1;
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return TokPrec;
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}
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/// Error* - These are little helper functions for error handling.
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ExprAST *Error(const char *Str) { fprintf(stderr, "Error: %s\n", Str);return 0;}
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PrototypeAST *ErrorP(const char *Str) { Error(Str); return 0; }
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FunctionAST *ErrorF(const char *Str) { Error(Str); return 0; }
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static ExprAST *ParseExpression();
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/// identifierexpr
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/// ::= identifier
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/// ::= identifier '(' expression* ')'
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static ExprAST *ParseIdentifierExpr() {
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std::string IdName = IdentifierStr;
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getNextToken(); // eat identifier.
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if (CurTok != '(') // Simple variable ref.
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return new VariableExprAST(IdName);
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// Call.
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getNextToken(); // eat (
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std::vector<ExprAST*> Args;
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if (CurTok != ')') {
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while (1) {
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ExprAST *Arg = ParseExpression();
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if (!Arg) return 0;
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Args.push_back(Arg);
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if (CurTok == ')') break;
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if (CurTok != ',')
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return Error("Expected ')' or ',' in argument list");
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getNextToken();
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}
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}
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// Eat the ')'.
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getNextToken();
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return new CallExprAST(IdName, Args);
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}
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/// numberexpr ::= number
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static ExprAST *ParseNumberExpr() {
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ExprAST *Result = new NumberExprAST(NumVal);
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getNextToken(); // consume the number
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return Result;
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}
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/// parenexpr ::= '(' expression ')'
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static ExprAST *ParseParenExpr() {
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getNextToken(); // eat (.
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ExprAST *V = ParseExpression();
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if (!V) return 0;
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if (CurTok != ')')
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return Error("expected ')'");
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getNextToken(); // eat ).
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return V;
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}
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/// ifexpr ::= 'if' expression 'then' expression 'else' expression
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static ExprAST *ParseIfExpr() {
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getNextToken(); // eat the if.
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// condition.
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ExprAST *Cond = ParseExpression();
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if (!Cond) return 0;
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if (CurTok != tok_then)
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return Error("expected then");
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getNextToken(); // eat the then
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ExprAST *Then = ParseExpression();
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if (Then == 0) return 0;
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if (CurTok != tok_else)
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return Error("expected else");
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getNextToken();
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ExprAST *Else = ParseExpression();
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if (!Else) return 0;
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return new IfExprAST(Cond, Then, Else);
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}
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/// forexpr ::= 'for' identifier '=' expr ',' expr (',' expr)? 'in' expression
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static ExprAST *ParseForExpr() {
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getNextToken(); // eat the for.
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if (CurTok != tok_identifier)
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return Error("expected identifier after for");
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std::string IdName = IdentifierStr;
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getNextToken(); // eat identifier.
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if (CurTok != '=')
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return Error("expected '=' after for");
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getNextToken(); // eat '='.
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ExprAST *Start = ParseExpression();
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if (Start == 0) return 0;
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if (CurTok != ',')
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return Error("expected ',' after for start value");
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getNextToken();
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ExprAST *End = ParseExpression();
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if (End == 0) return 0;
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// The step value is optional.
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ExprAST *Step = 0;
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if (CurTok == ',') {
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getNextToken();
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Step = ParseExpression();
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if (Step == 0) return 0;
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}
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if (CurTok != tok_in)
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return Error("expected 'in' after for");
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getNextToken(); // eat 'in'.
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ExprAST *Body = ParseExpression();
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if (Body == 0) return 0;
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return new ForExprAST(IdName, Start, End, Step, Body);
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}
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/// varexpr ::= 'var' identifier ('=' expression)?
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// (',' identifier ('=' expression)?)* 'in' expression
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static ExprAST *ParseVarExpr() {
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getNextToken(); // eat the var.
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std::vector<std::pair<std::string, ExprAST*> > VarNames;
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// At least one variable name is required.
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if (CurTok != tok_identifier)
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return Error("expected identifier after var");
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while (1) {
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std::string Name = IdentifierStr;
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getNextToken(); // eat identifier.
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// Read the optional initializer.
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ExprAST *Init = 0;
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if (CurTok == '=') {
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getNextToken(); // eat the '='.
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Init = ParseExpression();
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if (Init == 0) return 0;
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}
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VarNames.push_back(std::make_pair(Name, Init));
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// End of var list, exit loop.
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if (CurTok != ',') break;
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getNextToken(); // eat the ','.
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if (CurTok != tok_identifier)
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return Error("expected identifier list after var");
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}
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// At this point, we have to have 'in'.
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if (CurTok != tok_in)
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return Error("expected 'in' keyword after 'var'");
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getNextToken(); // eat 'in'.
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ExprAST *Body = ParseExpression();
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if (Body == 0) return 0;
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return new VarExprAST(VarNames, Body);
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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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/// ::= ifexpr
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/// ::= forexpr
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/// ::= varexpr
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static ExprAST *ParsePrimary() {
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switch (CurTok) {
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default: return Error("unknown token when expecting an expression");
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case tok_identifier: return ParseIdentifierExpr();
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case tok_number: return ParseNumberExpr();
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case '(': return ParseParenExpr();
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case tok_if: return ParseIfExpr();
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case tok_for: return ParseForExpr();
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case tok_var: return ParseVarExpr();
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}
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}
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/// unary
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/// ::= primary
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/// ::= '!' unary
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static ExprAST *ParseUnary() {
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// If the current token is not an operator, it must be a primary expr.
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if (!isascii(CurTok) || CurTok == '(' || CurTok == ',')
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return ParsePrimary();
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// If this is a unary operator, read it.
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int Opc = CurTok;
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getNextToken();
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if (ExprAST *Operand = ParseUnary())
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return new UnaryExprAST(Opc, Operand);
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return 0;
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}
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/// binoprhs
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/// ::= ('+' unary)*
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static ExprAST *ParseBinOpRHS(int ExprPrec, ExprAST *LHS) {
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// If this is a binop, find its precedence.
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while (1) {
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int TokPrec = GetTokPrecedence();
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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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// 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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// Parse the unary expression after the binary operator.
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ExprAST *RHS = ParseUnary();
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if (!RHS) return 0;
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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, RHS);
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if (RHS == 0) return 0;
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}
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// Merge LHS/RHS.
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LHS = new BinaryExprAST(BinOp, LHS, RHS);
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}
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}
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/// expression
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/// ::= unary binoprhs
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///
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static ExprAST *ParseExpression() {
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ExprAST *LHS = ParseUnary();
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if (!LHS) return 0;
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return ParseBinOpRHS(0, LHS);
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}
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/// prototype
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/// ::= id '(' id* ')'
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/// ::= binary LETTER number? (id, id)
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/// ::= unary LETTER (id)
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static PrototypeAST *ParsePrototype() {
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std::string FnName;
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unsigned Kind = 0; // 0 = identifier, 1 = unary, 2 = binary.
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unsigned BinaryPrecedence = 30;
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switch (CurTok) {
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default:
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return ErrorP("Expected function name in prototype");
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case tok_identifier:
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FnName = IdentifierStr;
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Kind = 0;
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getNextToken();
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break;
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case tok_unary:
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getNextToken();
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if (!isascii(CurTok))
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return ErrorP("Expected unary operator");
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FnName = "unary";
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FnName += (char)CurTok;
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Kind = 1;
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getNextToken();
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break;
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case tok_binary:
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getNextToken();
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if (!isascii(CurTok))
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return ErrorP("Expected binary operator");
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FnName = "binary";
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FnName += (char)CurTok;
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Kind = 2;
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getNextToken();
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// Read the precedence if present.
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if (CurTok == tok_number) {
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if (NumVal < 1 || NumVal > 100)
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return ErrorP("Invalid precedecnce: must be 1..100");
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BinaryPrecedence = (unsigned)NumVal;
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getNextToken();
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}
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break;
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}
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if (CurTok != '(')
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return ErrorP("Expected '(' in prototype");
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std::vector<std::string> ArgNames;
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|
while (getNextToken() == tok_identifier)
|
|
ArgNames.push_back(IdentifierStr);
|
|
if (CurTok != ')')
|
|
return ErrorP("Expected ')' in prototype");
|
|
|
|
// success.
|
|
getNextToken(); // eat ')'.
|
|
|
|
// Verify right number of names for operator.
|
|
if (Kind && ArgNames.size() != Kind)
|
|
return ErrorP("Invalid number of operands for operator");
|
|
|
|
return new PrototypeAST(FnName, ArgNames, Kind != 0, BinaryPrecedence);
|
|
}
|
|
|
|
/// definition ::= 'def' prototype expression
|
|
static FunctionAST *ParseDefinition() {
|
|
getNextToken(); // eat def.
|
|
PrototypeAST *Proto = ParsePrototype();
|
|
if (Proto == 0) return 0;
|
|
|
|
if (ExprAST *E = ParseExpression())
|
|
return new FunctionAST(Proto, E);
|
|
return 0;
|
|
}
|
|
|
|
/// toplevelexpr ::= expression
|
|
static FunctionAST *ParseTopLevelExpr() {
|
|
if (ExprAST *E = ParseExpression()) {
|
|
// Make an anonymous proto.
|
|
PrototypeAST *Proto = new PrototypeAST("", std::vector<std::string>());
|
|
return new FunctionAST(Proto, E);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/// external ::= 'extern' prototype
|
|
static PrototypeAST *ParseExtern() {
|
|
getNextToken(); // eat extern.
|
|
return ParsePrototype();
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Code Generation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
static Module *TheModule;
|
|
static IRBuilder<> Builder;
|
|
static std::map<std::string, AllocaInst*> NamedValues;
|
|
static FunctionPassManager *TheFPM;
|
|
|
|
Value *ErrorV(const char *Str) { Error(Str); return 0; }
|
|
|
|
/// CreateEntryBlockAlloca - Create an alloca instruction in the entry block of
|
|
/// the function. This is used for mutable variables etc.
|
|
static AllocaInst *CreateEntryBlockAlloca(Function *TheFunction,
|
|
const std::string &VarName) {
|
|
IRBuilder<> TmpB(&TheFunction->getEntryBlock(),
|
|
TheFunction->getEntryBlock().begin());
|
|
return TmpB.CreateAlloca(Type::DoubleTy, 0, VarName.c_str());
|
|
}
|
|
|
|
|
|
Value *NumberExprAST::Codegen() {
|
|
return ConstantFP::get(APFloat(Val));
|
|
}
|
|
|
|
Value *VariableExprAST::Codegen() {
|
|
// Look this variable up in the function.
|
|
Value *V = NamedValues[Name];
|
|
if (V == 0) return ErrorV("Unknown variable name");
|
|
|
|
// Load the value.
|
|
return Builder.CreateLoad(V, Name.c_str());
|
|
}
|
|
|
|
Value *UnaryExprAST::Codegen() {
|
|
Value *OperandV = Operand->Codegen();
|
|
if (OperandV == 0) return 0;
|
|
|
|
Function *F = TheModule->getFunction(std::string("unary")+Opcode);
|
|
if (F == 0)
|
|
return ErrorV("Unknown unary operator");
|
|
|
|
return Builder.CreateCall(F, OperandV, "unop");
|
|
}
|
|
|
|
|
|
Value *BinaryExprAST::Codegen() {
|
|
// Special case '=' because we don't want to emit the LHS as an expression.
|
|
if (Op == '=') {
|
|
// Assignment requires the LHS to be an identifier.
|
|
VariableExprAST *LHSE = dynamic_cast<VariableExprAST*>(LHS);
|
|
if (!LHSE)
|
|
return ErrorV("destination of '=' must be a variable");
|
|
// Codegen the RHS.
|
|
Value *Val = RHS->Codegen();
|
|
if (Val == 0) return 0;
|
|
|
|
// Look up the name.
|
|
Value *Variable = NamedValues[LHSE->getName()];
|
|
if (Variable == 0) return ErrorV("Unknown variable name");
|
|
|
|
Builder.CreateStore(Val, Variable);
|
|
return Val;
|
|
}
|
|
|
|
|
|
Value *L = LHS->Codegen();
|
|
Value *R = RHS->Codegen();
|
|
if (L == 0 || R == 0) return 0;
|
|
|
|
switch (Op) {
|
|
case '+': return Builder.CreateAdd(L, R, "addtmp");
|
|
case '-': return Builder.CreateSub(L, R, "subtmp");
|
|
case '*': return Builder.CreateMul(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::DoubleTy, "booltmp");
|
|
default: break;
|
|
}
|
|
|
|
// If it wasn't a builtin binary operator, it must be a user defined one. Emit
|
|
// a call to it.
|
|
Function *F = TheModule->getFunction(std::string("binary")+Op);
|
|
assert(F && "binary operator not found!");
|
|
|
|
Value *Ops[] = { L, R };
|
|
return Builder.CreateCall(F, Ops, Ops+2, "binop");
|
|
}
|
|
|
|
Value *CallExprAST::Codegen() {
|
|
// Look up the name in the global module table.
|
|
Function *CalleeF = TheModule->getFunction(Callee);
|
|
if (CalleeF == 0)
|
|
return ErrorV("Unknown function referenced");
|
|
|
|
// If argument mismatch error.
|
|
if (CalleeF->arg_size() != Args.size())
|
|
return ErrorV("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() == 0) return 0;
|
|
}
|
|
|
|
return Builder.CreateCall(CalleeF, ArgsV.begin(), ArgsV.end(), "calltmp");
|
|
}
|
|
|
|
Value *IfExprAST::Codegen() {
|
|
Value *CondV = Cond->Codegen();
|
|
if (CondV == 0) return 0;
|
|
|
|
// Convert condition to a bool by comparing equal to 0.0.
|
|
CondV = Builder.CreateFCmpONE(CondV,
|
|
ConstantFP::get(APFloat(0.0)),
|
|
"ifcond");
|
|
|
|
Function *TheFunction = Builder.GetInsertBlock()->getParent();
|
|
|
|
// Create blocks for the then and else cases. Insert the 'then' block at the
|
|
// end of the function.
|
|
BasicBlock *ThenBB = BasicBlock::Create("then", TheFunction);
|
|
BasicBlock *ElseBB = BasicBlock::Create("else");
|
|
BasicBlock *MergeBB = BasicBlock::Create("ifcont");
|
|
|
|
Builder.CreateCondBr(CondV, ThenBB, ElseBB);
|
|
|
|
// Emit then value.
|
|
Builder.SetInsertPoint(ThenBB);
|
|
|
|
Value *ThenV = Then->Codegen();
|
|
if (ThenV == 0) return 0;
|
|
|
|
Builder.CreateBr(MergeBB);
|
|
// Codegen of 'Then' can change the current block, update ThenBB for the PHI.
|
|
ThenBB = Builder.GetInsertBlock();
|
|
|
|
// Emit else block.
|
|
TheFunction->getBasicBlockList().push_back(ElseBB);
|
|
Builder.SetInsertPoint(ElseBB);
|
|
|
|
Value *ElseV = Else->Codegen();
|
|
if (ElseV == 0) return 0;
|
|
|
|
Builder.CreateBr(MergeBB);
|
|
// Codegen of 'Else' can change the current block, update ElseBB for the PHI.
|
|
ElseBB = Builder.GetInsertBlock();
|
|
|
|
// Emit merge block.
|
|
TheFunction->getBasicBlockList().push_back(MergeBB);
|
|
Builder.SetInsertPoint(MergeBB);
|
|
PHINode *PN = Builder.CreatePHI(Type::DoubleTy, "iftmp");
|
|
|
|
PN->addIncoming(ThenV, ThenBB);
|
|
PN->addIncoming(ElseV, ElseBB);
|
|
return PN;
|
|
}
|
|
|
|
Value *ForExprAST::Codegen() {
|
|
// Output this as:
|
|
// var = alloca double
|
|
// ...
|
|
// start = startexpr
|
|
// store start -> var
|
|
// goto loop
|
|
// loop:
|
|
// ...
|
|
// bodyexpr
|
|
// ...
|
|
// loopend:
|
|
// step = stepexpr
|
|
// endcond = endexpr
|
|
//
|
|
// curvar = load var
|
|
// nextvar = curvar + step
|
|
// store nextvar -> var
|
|
// br endcond, loop, endloop
|
|
// outloop:
|
|
|
|
Function *TheFunction = Builder.GetInsertBlock()->getParent();
|
|
|
|
// Create an alloca for the variable in the entry block.
|
|
AllocaInst *Alloca = CreateEntryBlockAlloca(TheFunction, VarName);
|
|
|
|
// Emit the start code first, without 'variable' in scope.
|
|
Value *StartVal = Start->Codegen();
|
|
if (StartVal == 0) return 0;
|
|
|
|
// Store the value into the alloca.
|
|
Builder.CreateStore(StartVal, Alloca);
|
|
|
|
// Make the new basic block for the loop header, inserting after current
|
|
// block.
|
|
BasicBlock *LoopBB = BasicBlock::Create("loop", TheFunction);
|
|
|
|
// Insert an explicit fall through from the current block to the LoopBB.
|
|
Builder.CreateBr(LoopBB);
|
|
|
|
// Start insertion in LoopBB.
|
|
Builder.SetInsertPoint(LoopBB);
|
|
|
|
// Within the loop, the variable is defined equal to the PHI node. If it
|
|
// shadows an existing variable, we have to restore it, so save it now.
|
|
AllocaInst *OldVal = NamedValues[VarName];
|
|
NamedValues[VarName] = Alloca;
|
|
|
|
// Emit the body of the loop. This, like any other expr, can change the
|
|
// current BB. Note that we ignore the value computed by the body, but don't
|
|
// allow an error.
|
|
if (Body->Codegen() == 0)
|
|
return 0;
|
|
|
|
// Emit the step value.
|
|
Value *StepVal;
|
|
if (Step) {
|
|
StepVal = Step->Codegen();
|
|
if (StepVal == 0) return 0;
|
|
} else {
|
|
// If not specified, use 1.0.
|
|
StepVal = ConstantFP::get(APFloat(1.0));
|
|
}
|
|
|
|
// Compute the end condition.
|
|
Value *EndCond = End->Codegen();
|
|
if (EndCond == 0) return EndCond;
|
|
|
|
// Reload, increment, and restore the alloca. This handles the case where
|
|
// the body of the loop mutates the variable.
|
|
Value *CurVar = Builder.CreateLoad(Alloca, VarName.c_str());
|
|
Value *NextVar = Builder.CreateAdd(CurVar, StepVal, "nextvar");
|
|
Builder.CreateStore(NextVar, Alloca);
|
|
|
|
// Convert condition to a bool by comparing equal to 0.0.
|
|
EndCond = Builder.CreateFCmpONE(EndCond,
|
|
ConstantFP::get(APFloat(0.0)),
|
|
"loopcond");
|
|
|
|
// Create the "after loop" block and insert it.
|
|
BasicBlock *AfterBB = BasicBlock::Create("afterloop", TheFunction);
|
|
|
|
// Insert the conditional branch into the end of LoopEndBB.
|
|
Builder.CreateCondBr(EndCond, LoopBB, AfterBB);
|
|
|
|
// Any new code will be inserted in AfterBB.
|
|
Builder.SetInsertPoint(AfterBB);
|
|
|
|
// Restore the unshadowed variable.
|
|
if (OldVal)
|
|
NamedValues[VarName] = OldVal;
|
|
else
|
|
NamedValues.erase(VarName);
|
|
|
|
|
|
// for expr always returns 0.0.
|
|
return Constant::getNullValue(Type::DoubleTy);
|
|
}
|
|
|
|
Value *VarExprAST::Codegen() {
|
|
std::vector<AllocaInst *> OldBindings;
|
|
|
|
Function *TheFunction = Builder.GetInsertBlock()->getParent();
|
|
|
|
// Register all variables and emit their initializer.
|
|
for (unsigned i = 0, e = VarNames.size(); i != e; ++i) {
|
|
const std::string &VarName = VarNames[i].first;
|
|
ExprAST *Init = VarNames[i].second;
|
|
|
|
// Emit the initializer before adding the variable to scope, this prevents
|
|
// the initializer from referencing the variable itself, and permits stuff
|
|
// like this:
|
|
// var a = 1 in
|
|
// var a = a in ... # refers to outer 'a'.
|
|
Value *InitVal;
|
|
if (Init) {
|
|
InitVal = Init->Codegen();
|
|
if (InitVal == 0) return 0;
|
|
} else { // If not specified, use 0.0.
|
|
InitVal = ConstantFP::get(APFloat(0.0));
|
|
}
|
|
|
|
AllocaInst *Alloca = CreateEntryBlockAlloca(TheFunction, VarName);
|
|
Builder.CreateStore(InitVal, Alloca);
|
|
|
|
// Remember the old variable binding so that we can restore the binding when
|
|
// we unrecurse.
|
|
OldBindings.push_back(NamedValues[VarName]);
|
|
|
|
// Remember this binding.
|
|
NamedValues[VarName] = Alloca;
|
|
}
|
|
|
|
// Codegen the body, now that all vars are in scope.
|
|
Value *BodyVal = Body->Codegen();
|
|
if (BodyVal == 0) return 0;
|
|
|
|
// Pop all our variables from scope.
|
|
for (unsigned i = 0, e = VarNames.size(); i != e; ++i)
|
|
NamedValues[VarNames[i].first] = OldBindings[i];
|
|
|
|
// Return the body computation.
|
|
return BodyVal;
|
|
}
|
|
|
|
|
|
Function *PrototypeAST::Codegen() {
|
|
// Make the function type: double(double,double) etc.
|
|
std::vector<const Type*> Doubles(Args.size(), Type::DoubleTy);
|
|
FunctionType *FT = FunctionType::get(Type::DoubleTy, Doubles, false);
|
|
|
|
Function *F = Function::Create(FT, Function::ExternalLinkage, Name, TheModule);
|
|
|
|
// If F conflicted, there was already something named 'Name'. If it has a
|
|
// body, don't allow redefinition or reextern.
|
|
if (F->getName() != Name) {
|
|
// Delete the one we just made and get the existing one.
|
|
F->eraseFromParent();
|
|
F = TheModule->getFunction(Name);
|
|
|
|
// If F already has a body, reject this.
|
|
if (!F->empty()) {
|
|
ErrorF("redefinition of function");
|
|
return 0;
|
|
}
|
|
|
|
// If F took a different number of args, reject.
|
|
if (F->arg_size() != Args.size()) {
|
|
ErrorF("redefinition of function with different # args");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
// Set names for all arguments.
|
|
unsigned Idx = 0;
|
|
for (Function::arg_iterator AI = F->arg_begin(); Idx != Args.size();
|
|
++AI, ++Idx)
|
|
AI->setName(Args[Idx]);
|
|
|
|
return F;
|
|
}
|
|
|
|
/// CreateArgumentAllocas - Create an alloca for each argument and register the
|
|
/// argument in the symbol table so that references to it will succeed.
|
|
void PrototypeAST::CreateArgumentAllocas(Function *F) {
|
|
Function::arg_iterator AI = F->arg_begin();
|
|
for (unsigned Idx = 0, e = Args.size(); Idx != e; ++Idx, ++AI) {
|
|
// Create an alloca for this variable.
|
|
AllocaInst *Alloca = CreateEntryBlockAlloca(F, Args[Idx]);
|
|
|
|
// Store the initial value into the alloca.
|
|
Builder.CreateStore(AI, Alloca);
|
|
|
|
// Add arguments to variable symbol table.
|
|
NamedValues[Args[Idx]] = Alloca;
|
|
}
|
|
}
|
|
|
|
|
|
Function *FunctionAST::Codegen() {
|
|
NamedValues.clear();
|
|
|
|
Function *TheFunction = Proto->Codegen();
|
|
if (TheFunction == 0)
|
|
return 0;
|
|
|
|
// If this is an operator, install it.
|
|
if (Proto->isBinaryOp())
|
|
BinopPrecedence[Proto->getOperatorName()] = Proto->getBinaryPrecedence();
|
|
|
|
// Create a new basic block to start insertion into.
|
|
BasicBlock *BB = BasicBlock::Create("entry", TheFunction);
|
|
Builder.SetInsertPoint(BB);
|
|
|
|
// Add all arguments to the symbol table and create their allocas.
|
|
Proto->CreateArgumentAllocas(TheFunction);
|
|
|
|
if (Value *RetVal = Body->Codegen()) {
|
|
// Finish off the function.
|
|
Builder.CreateRet(RetVal);
|
|
|
|
// Validate the generated code, checking for consistency.
|
|
verifyFunction(*TheFunction);
|
|
|
|
// Optimize the function.
|
|
TheFPM->run(*TheFunction);
|
|
|
|
return TheFunction;
|
|
}
|
|
|
|
// Error reading body, remove function.
|
|
TheFunction->eraseFromParent();
|
|
|
|
if (Proto->isBinaryOp())
|
|
BinopPrecedence.erase(Proto->getOperatorName());
|
|
return 0;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Top-Level parsing and JIT Driver
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
static ExecutionEngine *TheExecutionEngine;
|
|
|
|
static void HandleDefinition() {
|
|
if (FunctionAST *F = ParseDefinition()) {
|
|
if (Function *LF = F->Codegen()) {
|
|
fprintf(stderr, "Read function definition:");
|
|
LF->dump();
|
|
}
|
|
} else {
|
|
// Skip token for error recovery.
|
|
getNextToken();
|
|
}
|
|
}
|
|
|
|
static void HandleExtern() {
|
|
if (PrototypeAST *P = ParseExtern()) {
|
|
if (Function *F = P->Codegen()) {
|
|
fprintf(stderr, "Read extern: ");
|
|
F->dump();
|
|
}
|
|
} else {
|
|
// Skip token for error recovery.
|
|
getNextToken();
|
|
}
|
|
}
|
|
|
|
static void HandleTopLevelExpression() {
|
|
// Evaluate a top level expression into an anonymous function.
|
|
if (FunctionAST *F = ParseTopLevelExpr()) {
|
|
if (Function *LF = F->Codegen()) {
|
|
// JIT the function, returning a function pointer.
|
|
void *FPtr = TheExecutionEngine->getPointerToFunction(LF);
|
|
|
|
// 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)FPtr;
|
|
fprintf(stderr, "Evaluated to %f\n", FP());
|
|
}
|
|
} else {
|
|
// Skip token for error recovery.
|
|
getNextToken();
|
|
}
|
|
}
|
|
|
|
/// top ::= definition | external | expression | ';'
|
|
static void MainLoop() {
|
|
while (1) {
|
|
fprintf(stderr, "ready> ");
|
|
switch (CurTok) {
|
|
case tok_eof: return;
|
|
case ';': getNextToken(); break; // ignore top level semicolons.
|
|
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) {
|
|
putchar((char)X);
|
|
return 0;
|
|
}
|
|
|
|
/// printd - printf that takes a double prints it as "%f\n", returning 0.
|
|
extern "C"
|
|
double printd(double X) {
|
|
printf("%f\n", X);
|
|
return 0;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Main driver code.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
int main() {
|
|
// Install standard binary operators.
|
|
// 1 is lowest precedence.
|
|
BinopPrecedence['='] = 2;
|
|
BinopPrecedence['<'] = 10;
|
|
BinopPrecedence['+'] = 20;
|
|
BinopPrecedence['-'] = 20;
|
|
BinopPrecedence['*'] = 40; // highest.
|
|
|
|
// Prime the first token.
|
|
fprintf(stderr, "ready> ");
|
|
getNextToken();
|
|
|
|
// Make the module, which holds all the code.
|
|
TheModule = new Module("my cool jit");
|
|
|
|
// Create the JIT.
|
|
TheExecutionEngine = ExecutionEngine::create(TheModule);
|
|
|
|
{
|
|
ExistingModuleProvider OurModuleProvider(TheModule);
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FunctionPassManager OurFPM(&OurModuleProvider);
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// Set up the optimizer pipeline. Start with registering info about how the
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// target lays out data structures.
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OurFPM.add(new TargetData(*TheExecutionEngine->getTargetData()));
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// Promote allocas to registers.
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|
OurFPM.add(createPromoteMemoryToRegisterPass());
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// Do simple "peephole" optimizations and bit-twiddling optzns.
|
|
OurFPM.add(createInstructionCombiningPass());
|
|
// Reassociate expressions.
|
|
OurFPM.add(createReassociatePass());
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|
// Eliminate Common SubExpressions.
|
|
OurFPM.add(createGVNPass());
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|
// Simplify the control flow graph (deleting unreachable blocks, etc).
|
|
OurFPM.add(createCFGSimplificationPass());
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|
|
|
// Set the global so the code gen can use this.
|
|
TheFPM = &OurFPM;
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|
|
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// Run the main "interpreter loop" now.
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|
MainLoop();
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|
|
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TheFPM = 0;
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|
|
|
// Print out all of the generated code.
|
|
TheModule->dump();
|
|
|
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} // Free module provider (and thus the module) and pass manager.
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|
|
|
return 0;
|
|
}
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