Adds type for validating identifiers

identifiers
venko 2021-05-06 17:16:10 -07:00
parent 6ec5479db1
commit aeb36f9540
3 changed files with 169 additions and 1 deletions

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@ -23,7 +23,7 @@ find_package(LLVM)
include_directories(${CMAKE_SOURCE_DIR}) include_directories(${CMAKE_SOURCE_DIR})
BISON_TARGET(Parser generators/wraith.y ${CMAKE_CURRENT_BINARY_DIR}/y.tab.c COMPILE_FLAGS "-d -v -t -Wcounterexamples") BISON_TARGET(Parser generators/wraith.y ${CMAKE_CURRENT_BINARY_DIR}/y.tab.c COMPILE_FLAGS "-d -v -t")
FLEX_TARGET(Scanner generators/wraith.lex ${CMAKE_CURRENT_BINARY_DIR}/lex.yy.c) FLEX_TARGET(Scanner generators/wraith.lex ${CMAKE_CURRENT_BINARY_DIR}/lex.yy.c)
ADD_FLEX_BISON_DEPENDENCY(Scanner Parser) ADD_FLEX_BISON_DEPENDENCY(Scanner Parser)
@ -41,9 +41,11 @@ add_executable(
# Source # Source
src/ast.h src/ast.h
src/codegen.h src/codegen.h
src/identcheck.h
src/parser.h src/parser.h
src/ast.c src/ast.c
src/codegen.c src/codegen.c
src/identcheck.c
src/parser.c src/parser.c
src/main.c src/main.c
# Generated code # Generated code

130
src/identcheck.c Normal file
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@ -0,0 +1,130 @@
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include "ast.h"
#include "identcheck.h"
IdNode* MakeIdNode(NodeType type, char *name) {
IdNode *node = (IdNode*)malloc(sizeof(IdNode));
node->type = type;
node->name = strdup(name);
node->childCount = 0;
node->childCapacity = 0;
node->children = NULL;
return node;
}
void AddChildToNode(IdNode *node, IdNode *child) {
if (child == NULL) return;
if (node->children == NULL) {
node->childCapacity = 2;
node->children = (IdNode**)malloc(sizeof(IdNode*) * node->childCapacity);
} else if (node->childCount == node->childCapacity) {
node->childCapacity *= 2;
node->children = realloc(node->children, sizeof(IdNode*) * node->childCapacity);
}
node->children[node->childCount] = child;
node->childCount += 1;
}
IdNode* FindId(IdNode *root, NodeType targetType, char *targetName) {
IdNode *result = NULL;
IdNode **frontier = (IdNode**)malloc(sizeof(IdNode*));
frontier[0] = root;
uint32_t frontierCount = 1;
while (frontierCount > 0) {
IdNode *current = frontier[0];
if (current->type == targetType && strcmp(current->name, targetName)) {
result = current;
break;
}
IdNode **temp =
(IdNode**)malloc(sizeof(IdNode*) * (frontierCount - 1 + current->childCount));
uint32_t i;
for (i = 1; i < frontierCount; i++) {
temp[i - 1] = frontier[i];
}
uint32_t offset = i;
for (i = 0; i < current->childCount; i++) {
temp[offset + i] = current->children[i];
}
frontier = temp;
frontierCount += current->childCount - 1;
}
free(frontier);
return result;
}
IdNode* MakeIdTree(Node *astNode) {
switch (astNode->syntaxKind) {
case Declaration:
return MakeIdNode(Variable, astNode->children[1]->value.string);
case DeclarationSequence: {
IdNode *declSeqNode = MakeIdNode(LexicalScope, "");
uint32_t i;
for (i = 0; i < astNode->childCount; i++) {
AddChildToNode(declSeqNode, MakeIdTree(astNode->children[i]));
}
return declSeqNode;
}
case StructDeclaration: {
Node *idNode = astNode->children[0];
Node *declsNode = astNode->children[1];
IdNode *structNode = MakeIdNode(Struct, idNode->value.string);
uint32_t i;
for (i = 0; i < declsNode->childCount; i++) {
AddChildToNode(structNode, MakeIdTree(declsNode->children[i]));
}
return structNode;
}
case FunctionDeclaration: {
Node *sigNode = astNode->children[0];
Node *funcNameNode = sigNode->children[0];
Node *funcArgsNode = sigNode->children[2];
Node *bodyStatementsNode = astNode->children[1];
IdNode *funcNode = MakeIdNode(Function, funcNameNode->value.string);
uint32_t i;
for (i = 0; i < funcArgsNode->childCount; i++) {
AddChildToNode(funcNode, MakeIdTree(funcArgsNode->children[i]));
}
for (i = 0; i < bodyStatementsNode->childCount; i++) {
AddChildToNode(funcNode, MakeIdTree(bodyStatementsNode->children[i]));
}
return funcNode;
}
default:
return NULL;
}
}
void PrintIdTree(IdNode *tree, uint32_t tabCount) {
uint32_t i;
for (i = 0; i < tabCount; i++) {
printf("| ");
}
switch(tree->type) {
case LexicalScope: printf("Scope\n"); break;
case Struct: printf("%s : Struct\n", tree->name); break;
case Function: printf("%s : Function\n", tree->name); break;
case Variable: printf("%s : Variable\n", tree->name); break;
}
for (i = 0; i < tree->childCount; i++) {
PrintIdTree(tree->children[i], tabCount + 1);
}
}

36
src/identcheck.h Normal file
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@ -0,0 +1,36 @@
// Validates identifier usage in an AST.
#ifndef WRAITH_IDENTCHECK_H
#define WRAITH_IDENTCHECK_H
#include <stdint.h>
#include "ast.h"
typedef enum NodeType {
LexicalScope,
Struct,
Function,
Variable
} NodeType;
typedef struct IdNode {
NodeType type;
char *name;
struct IdNode **children;
uint32_t childCount;
uint32_t childCapacity;
} IdNode;
typedef struct IdStatus {
enum StatusCode {
Valid,
} StatusCode;
} IdStatus;
IdNode* MakeIdTree(Node *astNode);
void PrintIdTree(IdNode *tree, uint32_t tabCount);
//IdStatus CheckIds(Node *root);
#endif /* WRAITH_IDENTCHECK_H */