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#include "code-generator.h"
#include "compiler/ast-tree.h"
#include "utils/log.h"
#include "utils/memory.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
CodeGeneratorCode createGenerateCode(char *label_begin, char *label_end,
CodeGeneratorInstruction instruction) {
CodeGeneratorCode code = {
.label_begin = label_begin,
.label_end = label_end,
.instruction = instruction,
};
return code;
}
CodeGeneratorCode *newGenerateCode(char *label_begin, char *label_end,
CodeGeneratorInstruction instruction) {
CodeGeneratorCode *result = a404m_malloc(sizeof(*result));
result->label_begin = label_begin;
result->label_end = label_end;
result->instruction = instruction;
return result;
}
void generateCodePushCode(CodeGeneratorCodes *codes, CodeGeneratorCode code) {
size_t codes_size =
a404m_malloc_usable_size(codes->codes) / sizeof(*codes->codes);
if (codes_size == codes->codes_size) {
codes_size += codes_size / 2 + 1;
codes->codes =
a404m_realloc(codes->codes, codes_size * sizeof(*codes->codes));
}
codes->codes[codes->codes_size] = code;
codes->codes_size += 1;
}
CodeGeneratorCodes *codeGenerator(AstTreeRoot *astTreeRoot) {
CodeGeneratorCodes *codes = a404m_malloc(sizeof(*codes));
codes->codes = a404m_malloc(0);
codes->codes_size = 0;
for (size_t i = 0; i < astTreeRoot->variables.size; ++i) {
AstTreeVariable *variable = astTreeRoot->variables.data[i];
switch (variable->value->token) {
case AST_TREE_TOKEN_FUNCTION:
codeGeneratorAstTreeFunction(variable->name_begin, variable->name_end,
*variable->value, codes);
continue;
case AST_TREE_TOKEN_KEYWORD_PRINT:
generateCodePushCode(
codes,
createGenerateCode(NULL, NULL, CODE_GENERATOR_INSTRUCTION_PRINT));
continue;
case AST_TREE_TOKEN_NONE:
}
printLog("Bad token %d", variable->value->token);
}
return codes;
}
bool codeGeneratorAstTreeFunction(char *label_begin, char *label_end,
AstTree astTree, CodeGeneratorCodes *codes) {
AstTreeScope *scope = astTree.metadata;
for (size_t i = 0; i < scope->expressions_size; ++i) {
AstTree tree = scope->expressions[i];
switch (tree.token) {
case AST_TREE_TOKEN_KEYWORD_PRINT:
generateCodePushCode(
codes, createGenerateCode(label_begin, label_end,
CODE_GENERATOR_INSTRUCTION_PRINT));
goto OK;
case AST_TREE_TOKEN_FUNCTION:
case AST_TREE_TOKEN_NONE:
}
printLog("Bad token %d", tree.token);
return false;
OK:
label_begin = NULL;
label_end = NULL;
}
generateCodePushCode(codes,
createGenerateCode(label_begin, label_end,
CODE_GENERATOR_INSTRUCTION_RET));
return true;
}
static const char TEMPLATE[] =
"format ELF64 executable 3\nSYS_exit = 60\nSYS_write = 1\nSTDOUT = "
"1\nsegment readable writable\nhello: db \"Hello, "
"World!\",0xa\nhello_len = $-hello\nsegment readable executable\nentry "
"_start\nprint:\nmov rax, SYS_write\nmov rdi, STDOUT\nmov rsi, "
"hello\nmov rdx, hello_len\nsyscall\nret\n_start:\ncall main\nmov rax, "
"SYS_exit\nxor "
"rdi,rdi\nsyscall\n";
static const size_t TEMPLATE_LEN =
sizeof(TEMPLATE) / sizeof(*TEMPLATE) - sizeof(*TEMPLATE);
static void codeGeneratorAppendFlatASMCommand(char **fasm, size_t *fasm_size,
size_t *fasm_inserted,
const char *str, size_t str_len) {
size_t inserted_last = *fasm_inserted;
*fasm_inserted += str_len;
if (*fasm_inserted + 1 >= *fasm_size) {
*fasm_size = *fasm_inserted + *fasm_inserted / 2 + 1;
*fasm = a404m_realloc(*fasm, *fasm_size * sizeof(*fasm));
}
strncpy(*fasm + inserted_last, str, str_len);
}
char *codeGeneratorToFlatASM(const CodeGeneratorCodes *codes) {
size_t fasm_size = TEMPLATE_LEN + 1;
char *fasm = a404m_malloc(fasm_size * sizeof(*fasm));
size_t fasm_inserted = 0;
fasm[0] = '\0';
codeGeneratorAppendFlatASMCommand(&fasm, &fasm_size, &fasm_inserted, TEMPLATE,
TEMPLATE_LEN);
for (size_t i = 0; i < codes->codes_size; ++i) {
const CodeGeneratorCode code = codes->codes[i];
if (code.label_begin != code.label_end) {
codeGeneratorAppendFlatASMCommand(&fasm, &fasm_size, &fasm_inserted,
code.label_begin,
code.label_end - code.label_begin);
codeGeneratorAppendFlatASMCommand(&fasm, &fasm_size, &fasm_inserted,
":\n", 2);
}
switch (code.instruction) {
case CODE_GENERATOR_INSTRUCTION_PRINT: {
constexpr char INST[] = "call print\n";
codeGeneratorAppendFlatASMCommand(&fasm, &fasm_size, &fasm_inserted, INST,
strlen(INST));
}
continue;
case CODE_GENERATOR_INSTRUCTION_RET: {
constexpr char INST[] = "ret\n";
codeGeneratorAppendFlatASMCommand(&fasm, &fasm_size, &fasm_inserted, INST,
strlen(INST));
}
continue;
}
printLog("Bad instruction %d", code.instruction);
}
fasm[fasm_inserted] = '\0';
return fasm;
}
bool codeGeneratorFlatASMExec(const char *filePath, const char *fasm) {
const size_t filePathLen = strlen(filePath);
char *asmFilePath = a404m_malloc((filePathLen + 4 + 1) * sizeof(char));
strncpy(asmFilePath, filePath, filePathLen);
strcpy(asmFilePath + filePathLen, ".asm");
FILE *file = fopen(asmFilePath, "w");
if (file == NULL) {
return false;
}
fwrite(fasm, sizeof(*fasm), strlen(fasm), file);
fclose(file);
char *command;
asprintf(&command, "fasm -m 102400 \"%s\" \"%s\"", asmFilePath, filePath);
if (system(command) != 0) {
free(command);
return false;
}
free(command);
asprintf(&command, "chmod + \"%s\"", filePath);
if (system(command) != 0) {
free(command);
return false;
}
return true;
}
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