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code_gen.cpp
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code_gen.cpp
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#include "code_gen.hpp"
#include "ast_symbol.h"
#include "error.h"
#include <stdio.h>
#include <stdlib.h>
#include "llvm/ADT/STLExtras.h"
#include "llvm/IR/Function.h"
#include <llvm/IR/IRBuilder.h>
#include <llvm/IR/LegacyPassManager.h>
#include <llvm/IR/Module.h>
#include <llvm/IR/Value.h>
#include <llvm/IR/Verifier.h>
#include <llvm/Support/raw_ostream.h>
#include <llvm/Transforms/Scalar.h>
#if defined(LLVM_VERSION_MAJOR) && LLVM_VERSION_MAJOR >= 4
#include "llvm/Transforms/InstCombine/InstCombine.h"
#include "llvm/Transforms/Utils.h"
#include <llvm/Transforms/Scalar/GVN.h>
#endif
using namespace llvm;
static LLVMContext TheContext;
static IRBuilder<> Builder(TheContext);
static std::unique_ptr<Module> TheModule;
static std::unique_ptr<legacy::FunctionPassManager> TheFPM;
// Useful LLVM types.
static Type *i1 = IntegerType::get(TheContext, 1);
static Type *i8 = IntegerType::get(TheContext, 8);
static Type *i32 = IntegerType::get(TheContext, 32);
static Type *i64 = IntegerType::get(TheContext, 64);
static Type *f64 = Type::getDoubleTy(TheContext);
static Type *proc = Type::getVoidTy(TheContext);
// Useful LLVM helper functions.
inline ConstantInt *c_bool(bool b) {
return ConstantInt::get(TheContext, APInt(1, b, true));
}
inline ConstantInt *c_char(char c) {
return ConstantInt::get(TheContext, APInt(8, c, true));
}
inline ConstantInt *c_int(int n) {
return ConstantInt::get(TheContext, APInt(32, n, true));
}
inline ConstantFP *c_real(double n) {
return ConstantFP::get(TheContext, APFloat(n));
}
Type *find_llvm_type(PclType tp) {
/* function that converts symbol table type to llvm type */
switch (tp->kind) {
case TYPE_INTEGER: {
return i32;
}
case TYPE_CHAR: {
return i8;
}
case TYPE_BOOLEAN: {
return i1;
}
case TYPE_REAL: {
return f64;
}
case TYPE_VOID: {
return proc;
}
case TYPE_ARRAY:
case TYPE_IARRAY: {
return ArrayType::get(find_llvm_type(tp->refType), tp->size);
}
case TYPE_POINTER: {
return find_llvm_type(tp->refType)->getPointerTo();
}
default: { // Should not be reached
printf("Unknown error\n");
return NULL;
}
}
}
void generate_builtins() {
/* procedure for declaring builtin functions, which will be later defined by linking externally bultins.so (made from builtins.ll)*/
SymbolEntry *p;
Function *f;
FunctionType *tp;
//types used: int (4 bytes), char (1 byte), bool (1 byte), string (array of char), real (8 bytes - floating point)
/* writeInteger: takes int n as argument and prints n */
p = newFunction("writeInteger");
openScope();
newParameter("n", typeInteger, PASS_BY_VALUE, p);
endFunctionHeader(p, typeVoid);
tp = FunctionType::get(proc, std::vector<Type *>{i32}, false);
f = Function::Create(tp, Function::ExternalLinkage, "writeInteger",
TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* writeBoolean: takes bool b as argument and prints true (if b == 1) or false (if b == 0) */
p = newFunction("writeBoolean");
openScope();
newParameter("b", typeBoolean, PASS_BY_VALUE, p);
endFunctionHeader(p, typeVoid);
tp = FunctionType::get(proc, std::vector<Type *>{i1}, false);
f = Function::Create(tp, Function::ExternalLinkage, "writeBoolean",
TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* writeChar: takes char c as argument and prints c */
p = newFunction("writeChar");
openScope();
newParameter("c", typeChar, PASS_BY_VALUE, p);
endFunctionHeader(p, typeVoid);
tp = FunctionType::get(proc, std::vector<Type *>{i8}, false);
f = Function::Create(tp, Function::ExternalLinkage, "writeChar",
TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* writeReal: takes real r as argument and prints r */
p = newFunction("writeReal");
openScope();
newParameter("r", typeReal, PASS_BY_VALUE, p);
endFunctionHeader(p, typeVoid);
tp = FunctionType::get(proc, std::vector<Type *>{f64}, false);
f = Function::Create(tp, Function::ExternalLinkage, "writeReal",
TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* writeString: takes constant string s as argument and prints s */
p = newFunction("writeString");
openScope();
newParameter("s", typeIArray(typeChar), PASS_BY_REFERENCE, p);
endFunctionHeader(p, typeVoid);
tp = FunctionType::get(
proc, std::vector<Type *>{ArrayType::get(i8, 0)->getPointerTo()}, false);
f = Function::Create(tp, Function::ExternalLinkage, "writeString",
TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* abs: takes int n as argument and returns absolute value of n */
p = newFunction("abs");
openScope();
newParameter("n", typeInteger, PASS_BY_VALUE, p);
endFunctionHeader(p, typeInteger);
tp = FunctionType::get(i32, std::vector<Type *>{i32}, false);
f = Function::Create(tp, Function::ExternalLinkage, "abs", TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* fabs: takes real r as argument and returns absolute value of r as real */
p = newFunction("fabs");
openScope();
newParameter("r", typeReal, PASS_BY_VALUE, p);
endFunctionHeader(p, typeReal);
tp = FunctionType::get(f64, std::vector<Type *>{f64}, false);
f = Function::Create(tp, Function::ExternalLinkage, "fabs", TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* sqrt: takes real r as argument and returns square root of r */
p = newFunction("sqrt");
openScope();
newParameter("r", typeReal, PASS_BY_VALUE, p);
endFunctionHeader(p, typeReal);
tp = FunctionType::get(f64, std::vector<Type *>{f64}, false);
f = Function::Create(tp, Function::ExternalLinkage, "sqrt", TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* sin: takes real r as argument and returns sine of r */
p = newFunction("sin");
openScope();
newParameter("r", typeReal, PASS_BY_VALUE, p);
endFunctionHeader(p, typeReal);
tp = FunctionType::get(f64, std::vector<Type *>{f64}, false);
f = Function::Create(tp, Function::ExternalLinkage, "sin", TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* cos: takes real r as argument and returns cosine of r */
p = newFunction("cos");
openScope();
newParameter("r", typeReal, PASS_BY_VALUE, p);
endFunctionHeader(p, typeReal);
tp = FunctionType::get(f64, std::vector<Type *>{f64}, false);
f = Function::Create(tp, Function::ExternalLinkage, "cos", TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* tan: takes real r as argument and returns tangent of r */
p = newFunction("tan");
openScope();
newParameter("r", typeReal, PASS_BY_VALUE, p);
endFunctionHeader(p, typeReal);
tp = FunctionType::get(f64, std::vector<Type *>{f64}, false);
f = Function::Create(tp, Function::ExternalLinkage, "tan", TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* arctan: takes real r as argument and returns arctangent of r */
p = newFunction("arctan");
openScope();
newParameter("r", typeReal, PASS_BY_VALUE, p);
endFunctionHeader(p, typeReal);
tp = FunctionType::get(f64, std::vector<Type *>{f64}, false);
f = Function::Create(tp, Function::ExternalLinkage, "arctan",
TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* exp: takes real r as argument and returns e^r */
p = newFunction("exp");
openScope();
newParameter("r", typeReal, PASS_BY_VALUE, p);
endFunctionHeader(p, typeReal);
tp = FunctionType::get(f64, std::vector<Type *>{f64}, false);
f = Function::Create(tp, Function::ExternalLinkage, "exp", TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* ln: takes real r as argument and returns logarithm base e of r */
p = newFunction("ln");
openScope();
newParameter("r", typeReal, PASS_BY_VALUE, p);
endFunctionHeader(p, typeReal);
tp = FunctionType::get(f64, std::vector<Type *>{f64}, false);
f = Function::Create(tp, Function::ExternalLinkage, "ln", TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* pi: returns pi */
p = newFunction("pi");
openScope();
endFunctionHeader(p, typeReal);
tp = FunctionType::get(f64, std::vector<Type *>{}, false);
f = Function::Create(tp, Function::ExternalLinkage, "pi", TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* trunc: takes real r as argument, truncates the decimal portion of r and returns the rest as int */
p = newFunction("trunc");
openScope();
newParameter("r", typeReal, PASS_BY_VALUE, p);
endFunctionHeader(p, typeInteger);
tp = FunctionType::get(i32, std::vector<Type *>{f64}, false);
f = Function::Create(tp, Function::ExternalLinkage, "trunc2",
TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* round: takes real r as argument returns rounded r as int */
p = newFunction("round");
openScope();
newParameter("r", typeReal, PASS_BY_VALUE, p);
endFunctionHeader(p, typeInteger);
tp = FunctionType::get(i32, std::vector<Type *>{f64}, false);
f = Function::Create(tp, Function::ExternalLinkage, "round2",
TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* ord: takes char c as argument and returns its ascii code */
p = newFunction("ord");
openScope();
newParameter("c", typeChar, PASS_BY_VALUE, p);
endFunctionHeader(p, typeInteger);
tp = FunctionType::get(i32, std::vector<Type *>{i8}, false);
f = Function::Create(tp, Function::ExternalLinkage, "ord", TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* chr: takes ascii code (int) of c as argument and returns char c */
p = newFunction("chr");
openScope();
newParameter("n", typeInteger, PASS_BY_VALUE, p);
endFunctionHeader(p, typeChar);
tp = FunctionType::get(i8, std::vector<Type *>{i32}, false);
f = Function::Create(tp, Function::ExternalLinkage, "chr", TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* readInteger: returns int read from standard input */
p = newFunction("readInteger");
openScope();
endFunctionHeader(p, typeInteger);
tp = FunctionType::get(i32, std::vector<Type *>{}, false);
f = Function::Create(tp, Function::ExternalLinkage, "readInteger",
TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* readBoolean: returns bool read from standard input */
p = newFunction("readBoolean");
openScope();
endFunctionHeader(p, typeBoolean);
tp = FunctionType::get(i1, std::vector<Type *>{}, false);
f = Function::Create(tp, Function::ExternalLinkage, "readBoolean",
TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* readChar: returns char read from standard input */
p = newFunction("readChar");
openScope();
endFunctionHeader(p, typeChar);
tp = FunctionType::get(i8, std::vector<Type *>{}, false);
f = Function::Create(tp, Function::ExternalLinkage, "readChar",
TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* readReal: returns real read from standard input */
p = newFunction("readReal");
openScope();
endFunctionHeader(p, typeReal);
tp = FunctionType::get(f64, std::vector<Type *>{}, false);
f = Function::Create(tp, Function::ExternalLinkage, "readReal",
TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* readString: takes int size and array of char s as input and saves a string
of specfic size read from standard input as null terminated in s */
p = newFunction("readString");
openScope();
newParameter("size", typeInteger, PASS_BY_VALUE, p);
newParameter("s", typeIArray(typeChar), PASS_BY_REFERENCE, p);
endFunctionHeader(p, typeVoid);
tp = FunctionType::get(
proc, std::vector<Type *>{i32, ArrayType::get(i8, 0)->getPointerTo()},
false);
f = Function::Create(tp, Function::ExternalLinkage, "readString",
TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
/* Helping function, not required
cMalloc: takes int size, allocates heap memory of specific size and returns
its first position in memory */
p = newFunction("cMalloc");
openScope();
newParameter("s", typeInteger, PASS_BY_VALUE, p);
endFunctionHeader(p, typeInteger);
tp = FunctionType::get(i32, std::vector<Type *>{i64}, false);
f = Function::Create(tp, Function::ExternalLinkage, "cMalloc",
TheModule.get());
p->u.eFunction.llvmFunc = f;
closeScope();
}
Value *lvalue_pointer(ast *t, Function *cur_func) {
/* function that takes an ast t and returns its llvm stack memory position */
SymbolEntry *p;
Value *l, *r;
switch (t->k) {
case ID: {
p = lookupEntry(t->id, LOOKUP_ALL_SCOPES, false);
if (p->entryType == ENTRY_PARAMETER &&
p->u.eParameter.mode == PASS_BY_REFERENCE)
return Builder.CreateLoad(p->alloca_inst);
return p->alloca_inst;
}
case RESULT: {
p = lookupEntry("result", LOOKUP_ALL_SCOPES, false);
return p->alloca_inst;
}
case INDEX: {
if (t->left->k)
l = lvalue_pointer(t->left, cur_func);
r = code_gen(t->right, cur_func);
return Builder.CreateGEP(l, std::vector<Value *>{c_int(0), r});
}
case DEREF: {
l = code_gen(t->left, cur_func);
return l;
}
case STR_CONST: {
return Builder.CreateGlobalStringPtr(t->str);
}
default: { return NULL; }
}
}
void prepareFunctionSymbolTable(ast *t) {
/* function for declaring a function in the symbol table */
PassMode pass_type;
ast *head, *head1;
PclType tp;
t->sentry = newFunction(t->id);
openScope();
if (t->left) { // t->left : seq_formal (parameters)
head = t->left; // seq_formal
while (head) {
tp = head->left->right->type;
pass_type = head->left->k == VARREF ? PASS_BY_REFERENCE : PASS_BY_VALUE;
head1 = head->left->left;
while (head1) {
newParameter(head1->id, tp, pass_type, t->sentry);
head1 = head1->right;
}
head = head->right;
}
}
endFunctionHeader(t->sentry, t->type);
}
Value *code_gen(ast *t, Function *cur_func) {
/* main recursive function for generating llvm code */
SymbolEntry *p, *p1;
ast *head, *head1;
PclType tp;
Type *llvm_tp;
Function *f;
FunctionType *f_tp;
Value *l, *m, *r;
BasicBlock *lBB, *mBB, *rBB;
std::vector<Type *> params = std::vector<Type *>();
AllocaInst *Alloca;
if (!t) {
// Should not be reached
return NULL;
}
switch (t->k) {
case AND: {
// case '+'
l = code_gen(t->left, cur_func);
r = code_gen(t->right, cur_func);
return Builder.CreateAnd(l, r);
}
case OR: {
// case '||'
l = code_gen(t->left, cur_func);
r = code_gen(t->right, cur_func);
return Builder.CreateOr(l, r);
}
case BLOCK: {
// case block of statements
code_gen(t->left, cur_func);
return NULL;
}
case BODY: {
// case locals (if any) and block of statements
if (t->left)
code_gen(t->left, cur_func);
code_gen(t->right, cur_func);
return NULL;
}
case BOOL_CONST: {
// case constant bool (e.g. true or false)
return c_bool(t->boolean);
}
case CHAR_CONST: {
// case constant char
l = c_char(t->character);
return l;
}
case DIV: {
// case 'div'
l = code_gen(t->left, cur_func);
r = code_gen(t->right, cur_func);
return Builder.CreateSDiv(l, r);
}
case MOD: {
// case 'mod'
l = code_gen(t->left, cur_func);
r = code_gen(t->right, cur_func);
return Builder.CreateSRem(l, r);
}
case FORWARD: {
// case forward <header>
code_gen(t->left, cur_func);
forwardFunction(t->left->sentry);
closeScope();
return NULL;
}
case GOTO: {
// case 'goto <stmt>'
p = lookupEntry(t->str, LOOKUP_CURRENT_SCOPE, false);
if (p->u.eVariable.block) {
// if label is already defined create branch to that BasicBlock
Builder.CreateBr(p->u.eVariable.block);
return NULL;
} else {
// if label not already defined, save goto for when label is defined
p->u.eVariable.goto_stack.push_back(
&cur_func->getBasicBlockList().back());
lBB = BasicBlock::Create(TheContext, "help", cur_func);
Builder.SetInsertPoint(lBB);
return NULL;
}
return NULL;
}
case IF: {
// case 'if then (else)'
l = code_gen(t->left, cur_func);
lBB = BasicBlock::Create(TheContext, "then", cur_func);
mBB = BasicBlock::Create(TheContext, "else");
rBB = BasicBlock::Create(TheContext, "merge");
Builder.CreateCondBr(l, lBB, mBB);
Builder.SetInsertPoint(lBB);
code_gen(t->mid, cur_func);
Builder.CreateBr(rBB);
cur_func->getBasicBlockList().push_back(mBB);
Builder.SetInsertPoint(mBB);
if (t->right) {
//if else exists
code_gen(t->right, cur_func);
}
Builder.CreateBr(rBB);
cur_func->getBasicBlockList().push_back(rBB);
Builder.SetInsertPoint(rBB);
return NULL;
}
case INT_CONST: {
// case constant int
return c_int(t->integer);
}
case NEW: {
// case 'new'
p = lookupEntry("cMalloc", LOOKUP_ALL_SCOPES, false);
r = lvalue_pointer(t->right, cur_func);
if (t->left) {
// case 'new [size] l'
l = code_gen(t->left, cur_func);
m = Builder.CreateIntToPtr(
c_int(0),
find_llvm_type(t->right->type->refType->refType)->getPointerTo());
// trick with CreateGEP instruction to get size of that to which l is pointing
m = Builder.CreateGEP(m, c_int(1));
m = Builder.CreatePtrToInt(m, i32);
// size * number of elements
m = Builder.CreateMul(l, m);
m = Builder.CreateZExt(m, i64);
// call declared cMalloc
m = Builder.CreateCall(p->u.eFunction.llvmFunc, std::vector<Value *>{m});
m = Builder.CreateIntToPtr(
m, find_llvm_type(t->right->type->refType)->getPointerTo());
Builder.CreateStore(m, r);
}
else {
//case 'new l'
m = Builder.CreateIntToPtr(c_int(0), find_llvm_type(t->right->type));
m = Builder.CreateGEP(m, c_int(1));
m = Builder.CreatePtrToInt(m, i64);
m = Builder.CreateCall(p->u.eFunction.llvmFunc, std::vector<Value *>{m});
m = Builder.CreateIntToPtr(m, find_llvm_type(t->right->type));
Builder.CreateStore(m, r);
}
return NULL;
}
case NOT: {
// case 'not'
l = code_gen(t->left, cur_func);
return Builder.CreateNot(l);
}
case FUNCTION:
case PROCEDURE: {
prepareFunctionSymbolTable(t);
p1 = t->sentry->u.eFunction.firstArgument;
if (t->left) {
// if function (or procedure) has arguments
head = t->left; // seq_formal
while (head) {
llvm_tp = find_llvm_type(head->left->right->type);
if (p1->u.eParameter.mode == PASS_BY_REFERENCE) {
// if pass by reference pass pointer
llvm_tp = llvm_tp->getPointerTo();
}
head1 = head->left->left;
while (head1) {
// while loop for all variables in one declaration (e.g var x, y, z : integer)
params.push_back(llvm_tp);
head1 = head1->right;
p1 = p1->u.eParameter.next;
}
head = head->right;
}
}
f_tp = FunctionType::get(find_llvm_type(t->type), params, false);
f = Function::Create(f_tp, Function::InternalLinkage, t->id,
TheModule.get());
// save llvm object of funtion for later use
t->sentry->u.eFunction.llvmFunc = f;
return NULL;
}
case PROGRAM: {
// case 'program'
openScope();
generate_builtins();
f_tp = FunctionType::get(i32, std::vector<llvm::Type *>{}, false);
f = llvm::Function::Create(f_tp, llvm::Function::ExternalLinkage, "main",
TheModule.get());
BasicBlock *BB = BasicBlock::Create(TheContext, "entry", f);
Builder.SetInsertPoint(BB);
code_gen(t->left, f);
Builder.CreateRet(c_int(0));
closeScope();
if (optimize_code) {
TheFPM = std::make_unique<legacy::FunctionPassManager>(TheModule.get());
TheFPM->add(createPromoteMemoryToRegisterPass());
TheFPM->add(createInstructionCombiningPass());
TheFPM->add(createReassociatePass());
TheFPM->add(createGVNPass());
TheFPM->add(createCFGSimplificationPass());
TheFPM->doInitialization();
TheFPM->run(*f);
}
return NULL;
}
case REAL_CONST: {
//case constant real
return c_real(t->real);
}
case RESULT: {
// case 'result' as rvalue
p = lookupEntry("result", LOOKUP_CURRENT_SCOPE, false);
return Builder.CreateLoad(p->alloca_inst);
}
case WHILE: {
// case 'while'
l = code_gen(t->left, cur_func);
lBB = BasicBlock::Create(TheContext, "loop", cur_func);
rBB = BasicBlock::Create(TheContext, "after");
Builder.CreateCondBr(l, lBB, rBB);
Builder.SetInsertPoint(lBB);
code_gen(t->right, cur_func);
l = code_gen(t->left, cur_func);
Builder.CreateCondBr(l, lBB, rBB);
cur_func->getBasicBlockList().push_back(rBB);
Builder.SetInsertPoint(rBB);
return NULL;
}
case STR_CONST: {
// case constant string
return ConstantDataArray::getString(TheContext, t->str, true);
}
case NEQ: {
// case '<>'
l = code_gen(t->left, cur_func);
r = code_gen(t->right, cur_func);
if (t->left->type->kind == TYPE_INTEGER &&
t->right->type->kind == TYPE_REAL) {
l = Builder.CreateCast(Instruction::SIToFP, l, f64);
return Builder.CreateFCmpONE(l, r);
} else if (t->right->type->kind == TYPE_INTEGER &&
t->left->type->kind == TYPE_REAL) {
r = Builder.CreateCast(Instruction::SIToFP, r, f64);
return Builder.CreateFCmpONE(l, r);
} else if (t->right->type->kind == TYPE_REAL &&
t->left->type->kind == TYPE_REAL) {
return Builder.CreateFCmpONE(l, r);
}
return Builder.CreateICmpNE(l, r);
}
case EQ: {
// case '='
l = code_gen(t->left, cur_func);
r = code_gen(t->right, cur_func);
if (t->left->type->kind == TYPE_INTEGER &&
t->right->type->kind == TYPE_REAL) {
l = Builder.CreateCast(Instruction::SIToFP, l, f64);
return Builder.CreateFCmpOEQ(l, r);
} else if (t->right->type->kind == TYPE_INTEGER &&
t->left->type->kind == TYPE_REAL) {
r = Builder.CreateCast(Instruction::SIToFP, r, f64);
return Builder.CreateFCmpOEQ(l, r);
} else if (t->right->type->kind == TYPE_REAL &&
t->left->type->kind == TYPE_REAL) {
return Builder.CreateFCmpOEQ(l, r);
}
return Builder.CreateICmpEQ(l, r);
}
case GEQ: {
// case '>='
l = code_gen(t->left, cur_func);
r = code_gen(t->right, cur_func);
if (t->left->type->kind == TYPE_INTEGER &&
t->right->type->kind == TYPE_REAL) {
l = Builder.CreateCast(Instruction::SIToFP, l, f64);
return Builder.CreateFCmpOGE(l, r);
} else if (t->right->type->kind == TYPE_INTEGER &&
t->left->type->kind == TYPE_REAL) {
r = Builder.CreateCast(Instruction::SIToFP, r, f64);
return Builder.CreateFCmpOGE(l, r);
} else if (t->right->type->kind == TYPE_REAL &&
t->left->type->kind == TYPE_REAL) {
return Builder.CreateFCmpOGE(l, r);
}
return Builder.CreateICmpSGE(l, r);
}
case LEQ: {
// case '<='
l = code_gen(t->left, cur_func);
r = code_gen(t->right, cur_func);
if (t->left->type->kind == TYPE_INTEGER &&
t->right->type->kind == TYPE_REAL) {
l = Builder.CreateCast(Instruction::SIToFP, l, f64);
return Builder.CreateFCmpOLE(l, r);
} else if (t->right->type->kind == TYPE_INTEGER &&
t->left->type->kind == TYPE_REAL) {
r = Builder.CreateCast(Instruction::SIToFP, r, f64);
return Builder.CreateFCmpOLE(l, r);
} else if (t->right->type->kind == TYPE_REAL &&
t->left->type->kind == TYPE_REAL) {
return Builder.CreateFCmpOLE(l, r);
}
return Builder.CreateICmpSLE(l, r);
}
case LESS: {
// case '<'
l = code_gen(t->left, cur_func);
r = code_gen(t->right, cur_func);
if (t->left->type->kind == TYPE_INTEGER &&
t->right->type->kind == TYPE_REAL) {
l = Builder.CreateCast(Instruction::SIToFP, l, f64);
return Builder.CreateFCmpOLT(l, r);
} else if (t->right->type->kind == TYPE_INTEGER &&
t->left->type->kind == TYPE_REAL) {
r = Builder.CreateCast(Instruction::SIToFP, r, f64);
return Builder.CreateFCmpOLT(l, r);
} else if (t->right->type->kind == TYPE_REAL &&
t->left->type->kind == TYPE_REAL) {
return Builder.CreateFCmpOLT(l, r);
}
return Builder.CreateICmpSLT(l, r);
}
case GREATER: {
// case '>'
l = code_gen(t->left, cur_func);
r = code_gen(t->right, cur_func);
if (t->left->type->kind == TYPE_INTEGER &&
t->right->type->kind == TYPE_REAL) {
l = Builder.CreateCast(Instruction::SIToFP, l, f64);
return Builder.CreateFCmpOGT(l, r);
} else if (t->right->type->kind == TYPE_INTEGER &&
t->left->type->kind == TYPE_REAL) {
r = Builder.CreateCast(Instruction::SIToFP, r, f64);
return Builder.CreateFCmpOGT(l, r);
} else if (t->right->type->kind == TYPE_REAL &&
t->left->type->kind == TYPE_REAL) {
return Builder.CreateFCmpOGT(l, r);
}
return Builder.CreateICmpSGT(l, r);
}
case PLUS: {
// case '+'
l = code_gen(t->left, cur_func);
if (!t->right) {
// if unary operator
return l;
}
r = code_gen(t->right, cur_func);
if (t->left->type->kind == TYPE_INTEGER &&
t->right->type->kind == TYPE_REAL) {
l = Builder.CreateCast(Instruction::SIToFP, l, f64);
return Builder.CreateFAdd(l, r);
} else if (t->right->type->kind == TYPE_INTEGER &&
t->left->type->kind == TYPE_REAL) {
r = Builder.CreateCast(Instruction::SIToFP, r, f64);
return Builder.CreateFAdd(l, r);
} else if (t->right->type->kind == TYPE_REAL &&
t->left->type->kind == TYPE_REAL) {
return Builder.CreateFAdd(l, r);
}
return Builder.CreateAdd(l, r);
}
case MINUS: {
// case '-'
l = code_gen(t->left, cur_func);
if (!t->right) {
// if unary operator
if (t->left->type->kind == TYPE_REAL)
return Builder.CreateFSub(c_real(0.0), l);
else
return Builder.CreateSub(c_int(0), l);
}
r = code_gen(t->right, cur_func);
if (t->left->type->kind == TYPE_INTEGER &&
t->right->type->kind == TYPE_REAL) {
l = Builder.CreateCast(Instruction::SIToFP, l, f64);
return Builder.CreateFSub(l, r);
} else if (t->right->type->kind == TYPE_INTEGER &&
t->left->type->kind == TYPE_REAL) {
r = Builder.CreateCast(Instruction::SIToFP, r, f64);
return Builder.CreateFSub(l, r);
} else if (t->right->type->kind == TYPE_REAL &&
t->left->type->kind == TYPE_REAL) {
return Builder.CreateFSub(l, r);
}
return Builder.CreateSub(l, r);
}
case TIMES: {
// case '*'
l = code_gen(t->left, cur_func);
r = code_gen(t->right, cur_func);
if (t->left->type->kind == TYPE_INTEGER &&
t->right->type->kind == TYPE_REAL) {
l = Builder.CreateCast(Instruction::SIToFP, l, f64);
return Builder.CreateFMul(l, r);
} else if (t->right->type->kind == TYPE_INTEGER &&
t->left->type->kind == TYPE_REAL) {
r = Builder.CreateCast(Instruction::SIToFP, r, f64);
return Builder.CreateFMul(l, r);
} else if (t->right->type->kind == TYPE_REAL &&
t->left->type->kind == TYPE_REAL) {
return Builder.CreateFMul(l, r);
}
return Builder.CreateMul(l, r);
}
case DIVIDE: {
// case '/'
l = code_gen(t->left, cur_func);
r = code_gen(t->right, cur_func);
if (t->left->type->kind == TYPE_INTEGER) {
l = Builder.CreateCast(Instruction::SIToFP, l, f64);
}
if (t->right->type->kind == TYPE_INTEGER) {
r = Builder.CreateCast(Instruction::SIToFP, r, f64);
}
return Builder.CreateFDiv(l, r);
}
case DEREF: {
// case 'l^'
return Builder.CreateLoad(code_gen(t->left, cur_func));
}
case REF: {
// case '@l'
return lvalue_pointer(t->left, cur_func);
}
case SEQ_STMT: {
// case sequence of statements
for (head = t; head; head = head->right) {
if (!head->left)
break;
code_gen(head->left, cur_func);
}
return NULL;
}
case STMT: {
// case label : statement
lBB = BasicBlock::Create(TheContext, "labelb", cur_func);
Builder.CreateBr(lBB);
// label in t->id
p = lookupEntry(t->id, LOOKUP_CURRENT_SCOPE, false);
p->u.eVariable.block = lBB;
std::vector<BasicBlock *> v_blocks = p->u.eVariable.goto_stack;
while (!v_blocks.empty()) {
// make branches for the saved gotos
Builder.SetInsertPoint(v_blocks.back());
Builder.CreateBr(lBB);
v_blocks.pop_back();
}
Builder.SetInsertPoint(lBB);
code_gen(t->left, cur_func);
return NULL;
}
case INDEX: {
return Builder.CreateLoad(lvalue_pointer(t, cur_func));
}
case CALL: {
// case call of function (or procedure)
p = lookupEntry(t->id, LOOKUP_ALL_SCOPES, false);
p1 = p->u.eFunction.firstArgument;
f = p->u.eFunction.llvmFunc;
std::vector<Value *> params;
for (head = t->left; head; head = head->right) {
if (p1->u.eParameter.mode == PASS_BY_REFERENCE) {
l = lvalue_pointer(head->left, cur_func);
if (l->getType() !=
find_llvm_type(p1->u.eParameter.type)->getPointerTo()) {
l = Builder.CreateBitCast(
l, find_llvm_type(p1->u.eParameter.type)->getPointerTo());
}
} else {
l = code_gen(head->left, cur_func);
if (head->left->type->kind == TYPE_INTEGER &&
p1->u.eParameter.type->kind == TYPE_REAL) {
l = Builder.CreateCast(Instruction::SIToFP, l, f64);
}
}
params.push_back(l);
p1 = p1->u.eParameter.next;
}
auto ret = Builder.CreateCall(f, params);
return ret;
}
case SEQ_LOCAL: {
// case sequence of locals
for (head = t; head; head = head->right) {
code_gen(head->left, cur_func);
}
return NULL;
}
case SEQ_LOCAL_VAR: {
// case sequence of local vars (e.g. var x, y : integer; z, k : integer)
for (head = t; head; head = head->right) {
code_gen(head->left, cur_func);
}