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semi-complete semantic

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yenru0
2025-12-02 05:11:27 +09:00
parent f4501529df
commit f1fd203233
9 changed files with 567 additions and 213 deletions
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0
src/2024062806.md → out/parse.md
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0
src/2024062806.pdf → out/parse.pdf
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29
src/Makefile
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@@ -1,34 +1,31 @@
# Makefile for C-Minus
#
# ./lex/tiny.l --> ./cminus.l (from Project 1)
# ./yacc/tiny.y --> ./cminus.y
# ./yacc/globals.h --> ./globals.h
# ./yacc/tiny.y --> ./cminus.y (from Project 2)
# ./yacc/globals.h --> ./globals.h (from Project 2)
CC = gcc
CFLAGS = -W -Wall
CFLAGS = -W -Wall -g
OBJS = main.o util.o lex.yy.o y.tab.o
OBJS = main.o util.o lex.yy.o y.tab.o symtab.o analyze.o
.PHONY: all clean
all: cminus_parser
all: cminus_semantic
clean:
rm -vf cminus_parser *.o lex.yy.c y.tab.c y.tab.h y.output
rm -vf cminus_semantic *.o lex.yy.c y.tab.c y.tab.h y.output
cminus_parser: $(OBJS)
cminus_semantic: $(OBJS)
$(CC) $(CFLAGS) $(OBJS) -o $@ -lfl
main.o: main.c globals.h util.h scan.h parse.h y.tab.h
main.o: main.c globals.h util.h scan.h parse.h y.tab.h analyze.h
$(CC) $(CFLAGS) -c main.c
util.o: util.c util.h globals.h y.tab.h
$(CC) $(CFLAGS) -c util.c
scan.o: scan.c scan.h util.h globals.h y.tab.h
$(CC) $(CFLAGS) -c scan.c
lex.yy.o: lex.yy.c scan.h util.h globals.h y.tab.h
lex.yy.o: lex.yy.c scan.h globals.h y.tab.h util.h
$(CC) $(CFLAGS) -c lex.yy.c
lex.yy.c: cminus.l
@@ -40,4 +37,10 @@ y.tab.o: y.tab.c parse.h
$(CC) $(CFLAGS) -c y.tab.c
y.tab.c: cminus.y
yacc -d -Wcounterexamples -v cminus.y
yacc -d -v cminus.y
analyze.o: analyze.c analyze.h globals.h y.tab.h symtab.h util.h
$(CC) $(CFLAGS) -c analyze.c
symtab.o: symtab.c symtab.h
$(CC) $(CFLAGS) -c symtab.c

386
src/analyze.c
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@@ -1,159 +1,315 @@
/****************************************************/
/* File: analyze.c */
/* Semantic analyzer implementation */
/* for the TINY compiler */
/* Compiler Construction: Principles and Practice */
/* Kenneth C. Louden */
/* for the CMinus compiler */
/* Yenru0 */
/****************************************************/
#include "analyze.h"
#include "globals.h"
#include "symtab.h"
#include "analyze.h"
/* counter for variable memory locations */
static int location = 0;
static void symbolError(TreeNode *t, char *message) {
fprintf(listing, "Symbol error at line %d: %s\n", t->lineno, message);
Error = TRUE;
exit(-1);
}
static BucketList func_entry = NULL;
static Scope func_scope;
static TreeNode *func_params[256];
static int func_param_count = 0;
/* Procedure traverse is a generic recursive
* syntax tree traversal routine:
* it applies preProc in preorder and postProc
* in postorder to tree pointed to by t
*/
static void traverse( TreeNode * t,
void (* preProc) (TreeNode *),
void (* postProc) (TreeNode *) )
{ if (t != NULL)
{ preProc(t);
{ int i;
for (i=0; i < MAXCHILDREN; i++)
traverse(t->child[i],preProc,postProc);
static void traverse(TreeNode *t,
void (*preProc)(TreeNode *),
void (*postProc)(TreeNode *)) {
if (t != NULL) {
preProc(t);
{
int i;
for (i = 0; i < MAXCHILDREN; i++)
traverse(t->child[i], preProc, postProc);
}
postProc(t);
traverse(t->sibling, preProc, postProc);
}
postProc(t);
traverse(t->sibling,preProc,postProc);
}
}
/* nullProc is a do-nothing procedure to
* generate preorder-only or postorder-only
* traversals from traverse
*/
static void nullProc(TreeNode * t)
{ if (t==NULL) return;
else return;
static void nullProc(TreeNode *t) {
if (t == NULL) return;
else
return;
}
/* Procedure insertNode inserts
* identifiers stored in t into
* the symbol table
*/
static void insertNode( TreeNode * t)
{ switch (t->nodekind)
{ case StmtK:
switch (t->kind.stmt)
{ case AssignK:
case ReadK:
if (st_lookup(t->attr.name) == -1)
/* not yet in table, so treat as new definition */
st_insert(t->attr.name,t->lineno,location++);
else
/* already in table, so ignore location,
add line number of use only */
st_insert(t->attr.name,t->lineno,0);
break;
static void insertNode(TreeNode *t) {
//printf("Insert Node: line %d\n", t->lineno);
switch (t->nodekind) {
case ExpK:
switch (t->kind.exp) {
case IdK:
case ArrIdK:
case CallK: {
BucketList entry = st_lookup(t->attr.name);
if (entry == NULL) {
symbolError(t, "Undeclared Symbol");
} else {
// t->type = entry->type;// TODO: Ambiguity
t->scope = curr_scope();
st_entry_insert_line(entry, t->lineno);
t->type = entry->type;
}
}
default:
break;
}
break;
case StmtK:
switch (t->kind.stmt) {
case CompK:
if (func_scope != NULL) {
push_scope(func_scope);
func_scope = NULL;
for (int i = 0; i < func_param_count; i++) {
TreeNode *param = func_params[i];
func_entry->param_types[func_entry->param_count++] = param->type;
if (st_lookup_current(param->attr.name) != NULL) {
symbolError(param, "Redefinition of a Parameter");
} else {
st_try_insert(param->attr.name, SymbolParam, param->type, param->lineno);
}
}
func_entry = NULL;
func_scope = NULL;
func_param_count = 0;
} else {
push_scope(scope_new("compound"));
}
break;
default:
break;
}
break;
case DeclK:
switch (t->kind.decl) {
case FuncK:
if (st_lookup(t->attr.name) != NULL) {
symbolError(t, "Redefinition of a Function");
} else {
func_entry = st_try_insert(t->attr.name, SymbolFunc, t->type, t->lineno);
t->scope = curr_scope();
}
func_scope = scope_new(t->attr.name);
//push_scope(scope_new(t->attr.name));
break;
case ArrParamK:
case NonArrParamK: {
if (t->type != Void) {
func_params[func_param_count++] = t;
}
}
break;
case VarK:
case ArrVarK:
if (st_lookup_current(t->attr.name) != NULL) {
symbolError(t, "Redefinition of a Variable");
} else {
if (t->type == Void) {
symbolError(t, "Variable cannot be of type void");
break;
}
t->scope = curr_scope();
st_try_insert(t->attr.name, SymbolVar, t->type, t->lineno);
}
break;
default:
break;
}
break;
default:
break;
}
break;
case ExpK:
switch (t->kind.exp)
{ case IdK:
if (st_lookup(t->attr.name) == -1)
/* not yet in table, so treat as new definition */
st_insert(t->attr.name,t->lineno,location++);
else
/* already in table, so ignore location,
add line number of use only */
st_insert(t->attr.name,t->lineno,0);
break;
default:
break;
}
break;
default:
break;
}
break;
}
}
static void afterNode(TreeNode *t) {
if (t->nodekind == StmtK && t->kind.stmt == CompK) {
pop_scope();
}
}
/* Function buildSymtab constructs the symbol
* table by preorder traversal of the syntax tree
*/
void buildSymtab(TreeNode * syntaxTree)
{ traverse(syntaxTree,insertNode,nullProc);
if (TraceAnalyze)
{ fprintf(listing,"\nSymbol table:\n\n");
printSymTab(listing);
}
void buildSymtab(TreeNode *syntaxTree) {
st_init();
BucketList entry;
entry = st_try_insert("input", SymbolFunc, Integer, 0);
entry->param_count = 0;
entry = st_try_insert("output", SymbolFunc, Void, 0);
entry->param_types[0] = Integer;
entry->param_count = 1;
traverse(syntaxTree, insertNode, afterNode);
if (TraceAnalyze) {
fprintf(listing, "\nSymbol table:\n\n");
printSymTab(listing);
}
}
static void typeError(TreeNode * t, char * message)
{ fprintf(listing,"Type error at line %d: %s\n",t->lineno,message);
Error = TRUE;
static void typeError(TreeNode *t, char *message) {
fprintf(listing, "Type error at line %d: %s\n", t->lineno, message);
Error = TRUE;
}
/* Procedure checkNode performs
* type checking at a single tree node
*/
static void checkNode(TreeNode * t)
{ switch (t->nodekind)
{ case ExpK:
switch (t->kind.exp)
{ case OpK:
if ((t->child[0]->type != Integer) ||
(t->child[1]->type != Integer))
typeError(t,"Op applied to non-integer");
if ((t->attr.op == EQ) || (t->attr.op == LT))
t->type = Boolean;
else
t->type = Integer;
break;
case ConstK:
case IdK:
t->type = Integer;
break;
default:
break;
}
break;
case StmtK:
switch (t->kind.stmt)
{ case IfK:
if (t->child[0]->type == Integer)
typeError(t->child[0],"if test is not Boolean");
break;
case AssignK:
if (t->child[0]->type != Integer)
typeError(t->child[0],"assignment of non-integer value");
break;
case WriteK:
if (t->child[0]->type != Integer)
typeError(t->child[0],"write of non-integer value");
break;
case RepeatK:
if (t->child[1]->type == Integer)
typeError(t->child[1],"repeat test is not Boolean");
break;
default:
break;
}
break;
default:
break;
static void beforeCheckNode(TreeNode *t) {
if (t->nodekind == DeclK && t->kind.decl == FuncK) {
func_entry = st_lookup(t->attr.name);
}
}
static void checkNode(TreeNode *t) {
switch (t->nodekind) {
case ExpK:
switch (t->kind.exp) {
case OpK: {
TreeNode *left = t->child[0];
TreeNode *right = t->child[1];
if (left->type != Integer || right->type != Integer) {
typeError(t, "Operator applied to non-integer");
}
t->type = Integer;
}
} break;
case ConstK:
t->type = Integer;
break;
case IdK: {
BucketList entry = st_lookup_from(t->attr.name, t->scope);
t->type = entry->type;
} break;
case ArrIdK: {
if (t->child[0]->type != Integer) {
typeError(t, "Array subscript is not an integer");
}
t->type = IntegerArray;
} break;
case AssignK: {
TreeNode *left = t->child[0];
TreeNode *right = t->child[1];
if (left->type != right->type) {
typeError(t, "Assignment of different types");
}
t->type = left->type;
} break;
case CallK: {
BucketList entry = st_lookup_from(t->attr.name, t->scope);// not null
if (entry->symbolKind != SymbolFunc) {
typeError(t, "Call to a non-function");
}
TreeNode *arg = t->child[0];
int i = 0;// 파라미터 인덱스
while (arg != NULL && i < entry->param_count) {
if (arg->type != entry->param_types[i]) {
typeError(t, "Type mismatch in argument: Expected different type");
}
arg = arg->sibling;
i++;
}
if (arg != NULL) {
typeError(t, "Too many arguments in function call");
} else if (i < entry->param_count) {
typeError(t, "Too few arguments in function call");
}
t->type = entry->returnType;
} break;
default:
break;
}
break;
case StmtK:
switch (t->kind.stmt) {
case ReturnK: {
if (func_entry == NULL) {
typeError(t, "Return statement is not in a function");
break;
}
TreeNode *retval = t->child[0]; /* nullalbe */
if (func_entry->returnType == Void) {
if (retval != NULL) {
typeError(t, "Return with a value in a void function");
}
} else {
if (retval == NULL) {
typeError(t, "Return without a value in a non-void function");
} else if (retval->type != func_entry->returnType) {
typeError(t, "Return type mismatch");
}
}
} break;
case IterK: {
TreeNode *condition = t->child[0];
if (condition->type != Integer) {
typeError(t, "While condition is not of type integer");
}
} break;
case IfK: {
TreeNode *condition = t->child[0];
if (condition->type != Integer) {
typeError(t, "If condition is not of type integer");
}
} break;
default:
break;
}
break;
case DeclK:
switch (t->kind.decl) {
case FuncK:
func_entry = NULL;
break;
default:
break;
}
default:
break;
}
}
/* Procedure typeCheck performs type checking
* by a postorder syntax tree traversal
*/
void typeCheck(TreeNode * syntaxTree)
{ traverse(syntaxTree,nullProc,checkNode);
void typeCheck(TreeNode *syntaxTree) {
traverse(syntaxTree, beforeCheckNode, checkNode);
}

13
src/globals.h
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@@ -14,6 +14,9 @@
#include <stdlib.h>
#include <string.h>
struct Scope;
typedef struct Scope *Scope;
#ifndef FALSE
#define FALSE 0
#endif
@@ -103,7 +106,14 @@ typedef enum { TypeNameK } TypeKind;
/* ExpType is used for type checking */
typedef enum { Void,
Integer,
IntegerArray } ExpType;
IntegerArray
} ExpType;
typedef enum {
SymbolVar,
SymbolFunc,
SymbolParam
} SymbolKind;
#define MAXCHILDREN 3
@@ -124,6 +134,7 @@ typedef struct treeNode {
char *name;
} attr;
ExpType type; /* for type checking of exps */
Scope scope;
} TreeNode;
/**************************************************/

4
src/main.c
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@@ -10,7 +10,7 @@
/* set NO_PARSE to TRUE to get a scanner-only compiler */
#define NO_PARSE FALSE
/* set NO_ANALYZE to TRUE to get a parser-only compiler */
#define NO_ANALYZE TRUE
#define NO_ANALYZE FALSE
/* set NO_CODE to TRUE to get a compiler that does not
* generate code
@@ -40,7 +40,7 @@ FILE *code;
int EchoSource = FALSE;
int TraceScan = FALSE;
int TraceParse = TRUE;
int TraceAnalyze = FALSE;
int TraceAnalyze = TRUE;
int TraceCode = FALSE;
int Error = FALSE;

245
src/symtab.c
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@@ -4,8 +4,6 @@
/* (allows only one symbol table) */
/* Symbol table is implemented as a chained */
/* hash table */
/* Compiler Construction: Principles and Practice */
/* Kenneth C. Louden */
/****************************************************/
#include "symtab.h"
@@ -13,6 +11,17 @@
#include <stdlib.h>
#include <string.h>
Scope scope_stack[MAX_SCOPE_DEPTH];
int scope_stack_top = -1;
Scope scope_global;// no sibling no parent
void st_init(void) {
scope_global = scope_new("global");
scope_global->depth = 0;
scope_stack_top = 0;
scope_stack[scope_stack_top] = scope_global;
}
/* SHIFT is the power of two used as multiplier
in hash function */
#define SHIFT 4
@@ -28,79 +37,213 @@ static int hash(char *key) {
return temp;
}
Scope curr_scope(void) {
if (top_stack == -1) {
return NULL;
Scope scope_new(char *scope_name) {// it
Scope new_scope = (Scope) malloc(sizeof(struct Scope));
new_scope->name = scope_name;
new_scope->depth = -1;
new_scope->parent = NULL;
new_scope->child = NULL;
new_scope->child_last = NULL;
new_scope->next_sibling = NULL;
new_scope->location = 0;
return new_scope;
}
void pop_scope(void) {
if (scope_stack_top == -1) {// empty
return;
} else {
return scope_stack[top_stack];
scope_stack[scope_stack_top] = NULL;
scope_stack_top--;
}
}
/* Procedure st_insert inserts line numbers and
* memory locations into the symbol table
* loc = memory location is inserted only the
* first time, otherwise ignored
*/
void st_insert(char *name, int lineno, int loc) {
void push_scope(Scope scope) {
if (scope_stack_top == MAX_SCOPE_DEPTH - 1) {// full
return;
} else {
Scope before = curr_scope();
if (before->child == NULL) {
before->child = scope;
before->child_last = scope;
} else {
before->child_last->next_sibling = scope;
before->child_last = scope;
}
scope->parent = before;
scope->depth = before->depth + 1;
scope_stack_top++;
scope_stack[scope_stack_top] = scope;
}
}
Scope curr_scope(void) {
if (scope_stack_top == -1) {
return NULL;
} else {
return scope_stack[scope_stack_top];
}
}
BucketList st_try_insert(char *name, SymbolKind symbolkind, ExpType type, int lineno) {
int h = hash(name);
Scope scope = curr_scope();
BucketList *hashTable = scope->hashTable;
BucketList l = hashTable[h];
while ((l != NULL) && (strcmp(name, l->name) != 0))
l = l->next;
if (l == NULL) /* variable not yet in table */
{
l = (BucketList) malloc(sizeof(struct BucketListRec));
if (l == NULL) { /* variable not yet in table */
l = (BucketList) malloc(sizeof(struct BucketListEntry));
l->name = name;
l->lines = (LineList) malloc(sizeof(struct LineListRec));
l->symbolKind = symbolkind;
l->lines = (LineList) malloc(sizeof(struct LineListEntry));
l->lines->lineno = lineno;
l->memloc = loc;
l->symbolKind = symbolkind;
if (symbolkind == SymbolFunc) {
l->type = Void;
l->returnType = type;
l->param_count = 0;
} else {
l->type = type;
l->returnType = type;
}
l->lines->next = NULL;
l->memloc = scope->location;
scope->location++;
l->next = hashTable[h];
hashTable[h] = l;
} else /* found in table, so just add line number */
{
} else { /* found in table, so just add line number */
LineList t = l->lines;
while (t->next != NULL) t = t->next;
t->next = (LineList) malloc(sizeof(struct LineListRec));
while (t->next != NULL)
t = t->next;
t->next = (LineList) malloc(sizeof(struct LineListEntry));
t->next->lineno = lineno;
t->next->next = NULL;
}
} /* st_insert */
return l;
}
/* Function st_lookup returns the memory
* location of a variable or -1 if not found
*/
int st_lookup(char *name) {
void st_entry_insert_line(BucketList entry, int lineno) {
if (entry == NULL) return;
LineList t = entry->lines;
while (t->next != NULL)
t = t->next;
t->next = (LineList) malloc(sizeof(struct LineListEntry));
t->next->lineno = lineno;
t->next->next = NULL;
}
BucketList st_lookup_current(char *name) {
int h = hash(name);
Scope scope = curr_scope();
BucketList *hashTable = scope->hashTable;
BucketList l = hashTable[h];
while ((l != NULL) && (strcmp(name, l->name) != 0))
l = l->next;
if (l == NULL) return -1;
else
return l->memloc;
return l;
}
/* Procedure printSymTab prints a formatted
* listing of the symbol table contents
* to the listing file
*/
void printSymTab(FILE *listing) {
int i;
fprintf(listing, "Variable Name Location Line Numbers\n");
fprintf(listing, "------------- -------- ------------\n");
for (i = 0; i < SYMTAB_SIZE; ++i) {
if (hashTable[i] != NULL) {
BucketList l = hashTable[i];
while (l != NULL) {
LineList t = l->lines;
fprintf(listing, "%-14s ", l->name);
fprintf(listing, "%-8d ", l->memloc);
while (t != NULL) {
fprintf(listing, "%4d ", t->lineno);
t = t->next;
}
fprintf(listing, "\n");
l = l->next;
BucketList st_lookup(char *name) {
int h = hash(name);
Scope scope = curr_scope();
while (scope != NULL) {
BucketList *hashTable = scope->hashTable;
BucketList l = hashTable[h];
while ((l != NULL) && (strcmp(name, l->name) != 0))
l = l->next;
if (l != NULL) {
return l;
}
scope = scope->parent;
}
return NULL; /* not found */
}
BucketList st_lookup_from(char *name, Scope scope) {
int h = hash(name);
while (scope != NULL) {
BucketList *hashTable = scope->hashTable;
BucketList l = hashTable[h];
while ((l != NULL) && (strcmp(name, l->name) != 0))
l = l->next;
if (l != NULL) {
return l;
}
scope = scope->parent;
}
return NULL; /* not found */
}
void printScope(FILE *listing, Scope scope) {
if (scope == NULL) return;
fprintf(listing, "Scope Name: %s, Depth: %d\n", scope->name, scope->depth);
fprintf(listing, "-----------------------------------------\n");
fprintf(listing, "Variable Name Symbol Kind Type Location Line Numbers\n");
fprintf(listing, "------------------------------------------------------------\n");
for (int i = 0; i < SYMTAB_SIZE; i++) {
BucketList l = scope->hashTable[i];
while (l != NULL) {
fprintf(listing, "%-14s", l->name);
switch (l->symbolKind) {
case SymbolVar:
fprintf(listing, "%-13s", "Variable");
break;
case SymbolFunc:
fprintf(listing, "%-13s", "Function");
break;
case SymbolParam:
fprintf(listing, "%-13s", "Parameter");
break;
}
switch (l->type) {
case Void:
fprintf(listing, "%-11s", "void");
break;
case Integer:
fprintf(listing, "%-11s", "int");
break;
case IntegerArray:
fprintf(listing, "%-11s", "int[]");
break;
}
fprintf(listing, "%-9d", l->memloc);
LineList t = l->lines;
while (t != NULL) {
fprintf(listing, "%d ", t->lineno);
t = t->next;
}
fprintf(listing, "\n");
l = l->next;
}
}
} /* printSymTab */
fprintf(listing, "\n");
}
static void printScopeRecursive(FILE *listing, Scope scope) {
if (scope == NULL) return;
printScope(listing, scope);
Scope child = scope->child;
while (child != NULL) {
printScopeRecursive(listing, child);
child = child->next_sibling;
}
}
void printScopeTree(FILE *listing) {
if (scope_global == NULL) return;
Scope current_scope = scope_global;
printScopeRecursive(listing, current_scope);
}
void printSymTab(FILE *listing) {
printScopeTree(listing);
}

88
src/symtab.h
View File

@@ -9,16 +9,23 @@
#include "globals.h"
/* SYMTAB_SIZE is the size of the hash table */
/**
* it is the size of the hash table
*/
#define SYMTAB_SIZE 211
#define MAX_SCOPE_DEPTH 32
#define MAX_SCOPE_COUNT 1557
#define MAX_PARAM_COUNT 13
/* the list of line numbers of the source
* code in which a variable is referenced
*/
typedef struct LineListEntry {
int lineno;
struct LineListEntry *next;
} *LineList;
} * LineList;
/* The record in the bucket lists for
* each variable, including name,
@@ -29,28 +36,43 @@ typedef struct LineListEntry {
typedef struct BucketListEntry {
char *name;
LineList lines;
SymbolKind symbolKind;
ExpType type;
ExpType param_types[MAX_PARAM_COUNT];
int param_count;
ExpType returnType;
int memloc; /* memory location for variable */
struct BucketListEntry *next;
} *BucketList;
} * BucketList;
typedef struct Scope {
struct Scope {
char *name;
int depth;
struct Scope *parent;
struct Scope *child;
struct Scope *child_last;
struct Scope *next_sibling;
int location;
BucketList hashTable[SYMTAB_SIZE];
} *Scope;
};
Scope scope_global;
extern Scope scope_global;// no sibling no parent
static Scope scope_list[SYMTAB_SIZE];
static int size_list = 0;
extern Scope scope_stack[MAX_SCOPE_DEPTH];
extern int scope_stack_top;
static Scope scope_stack[SYMTAB_SIZE];
static int top_stack = -1;
/**
* before using the symbol table, initialize the global scope
*/
void st_init(void);
/**
* create a new scope with given name
* @note it does not link parent or insert into stack/list
* @param scope_name: name of the scope
* @return the created scope
*/
@@ -61,29 +83,33 @@ Scope scope_new(char *scope_name);
void pop_scope(void);
/**
* push a scope into the scope stack
* @note it does link the parent or siblings to construct tree
* @param scope: the scope to be pushed
*/
void push_scope(Scope scope);
/**
* insert a scope into the scope list
*/
void insert_scope_to_list(Scope scope);
/**
* get the top of the scope stack
* get the top of the scope stack wit
* @return the current scope or NULL if the stack is empty
*/
Scope curr_scope(void);
/**
* insert a variable into the symbol table
* or update a variable if it already exists
* @param scope_name name of the scope
* insert a variable into the symbol table of the current scope
* or add a line number if it already exists
* @param name name of the variable
* @param symbolkind kind of the symbol
* @param type type of the variable
* @param lineno line number of the variable
* @param loc memory location of the variable
* @return 0 if success, -1 if failure
*/
int st_try_insert(char *name, ExpType type, int loc);
BucketList st_try_insert(char *name, SymbolKind symbolkind, ExpType type, int lineno);
/**
* insert a line number into the variable's line list
* @param entry the bucket list entry of the variable
* @param lineno the line number to be inserted
*/
void st_entry_insert_line(BucketList entry, int lineno);
/**
* lookup a variable in the current scope
* @param name name of the variable to lookup
@@ -91,22 +117,24 @@ int st_try_insert(char *name, ExpType type, int loc);
*/
BucketList st_lookup_current(char *name);
/**
* lookup a variable from the given scope to root
* lookup a variable from the top scope to root
* @param name name of the variable to lookup
* @return the bucket list entry of the variable or NULL if not found
*/
BucketList st_lookup(char *name);
/**
* find a scope from the scope list
* @param scope_name name of the scope to find
* @return the scope or NULL if not found
*/
Scope find_scope(char *scope_name);
/**
* Procedure printSymTab prints a formatted
* listing of the symbol table contents
* to the listing file
* lookup a variable from the given scope to root
* @param name name of the variable to lookup
* @param scope the scope to start lookup from
* @return the bucket list entry of the variable or NULL if not found
*/
BucketList st_lookup_from(char *name, Scope scope);
void printScope(FILE *listing, Scope scope);
void printScopeTree(FILE *listing);
void printSymTab(FILE *listing);
#endif

13
src/test.cm Normal file
View File

@@ -0,0 +1,13 @@
int fib(int n) {
if (n <= 0) {
return 1;
} else {
return fib(n * fib(n - 1));
}
}
int main(void) {
int x;
x = fib(input());
output(x);
}