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JVM_core.c
213 lines (173 loc) · 7.43 KB
/
JVM_core.c
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#include "macros.h"
#include "JVM_core.h"
#include "LoadClass_core.h"
#include "Execution_Core.h"
#include "LoadClass_ui.h"
/**
* @brief Inicializa a JVM; Aloca memória para as estruturas principais;
Chama o carregador para a primeira classe; inicializa a primeira classe
*
* @param classHeap
* @param objectHeap
* @param stackFrame
* @param classPathF_ptr
*/
void jvmStartup(ClassFile *classHeap_ptr, Object *objectHeap_ptr, Frame *stackFrame_ptr, FILE *classPathF_ptr, dataMSize_t *dmSize_ptr){
classHeap_ptr = malloc( CLSHEAP_MAX*sizeof( ClassFile ) );
objectHeap_ptr = malloc( OBJHEAP_MAX*sizeof( Object_t ) );
stackFrame_ptr = malloc( STKFRAME_MAX*sizeof( Frame ) );
dmSize_ptr->clsHeap_size = 0;
dmSize_ptr->objHeap_size = 0;
dmSize_ptr->stkHeap_size = 0;
//Carrega a classe inicial
//OK!
loadClass(classPathF_ptr, classHeap_ptr, dmSize_ptr);
printf("\nstatic_values_size %d", classHeap_ptr->static_values_size);
for(int i = 0; i < classHeap_ptr->static_values_size; i++)
printf("\nname %s", classHeap_ptr->static_values[i].field_name);
//Checa a consistência da classe
printf("\n\nConteudo do .class");
printf("\n--------------------------------");
print_ClassFile(classHeap_ptr);
//Inicializa a classe inicial, roda clinit
//OK!
initializeClass(classHeap_ptr, stackFrame_ptr, dmSize_ptr, classHeap_ptr);
//initializeClass(classHeap_ptr, stackFrame_ptr, &dmSize_ptr->stkHeap_size); //Sei que o primeiro elemento da classHeap é a classe inicial
//Chamo o método main
callMethod(classHeap_ptr, stackFrame_ptr, dmSize_ptr, classHeap_ptr, "main", "([Ljava/lang/String;)V");
}
/**
* @brief
*
* @param class_ptr
* @param stkFrame_ptr
* @param stkFrameTop_ptr
*/
void initializeClass(ClassFile *class_ptr, Frame *stkFrame_ptr, dataMSize_t *dmSize_ptr, ClassFile *classHeap_ptr){
u2 method_idx = seekMethodInClass( class_ptr, "<clinit>", "()V" );
method_info *method_ptr = &class_ptr->methods[method_idx];
//Quem cria deleta.
createFrame(method_ptr, class_ptr, stkFrame_ptr, &dmSize_ptr->stkHeap_size);//Cria o frame para o método <clinit> da classe.
u2 aux_idx = dmSize_ptr->stkHeap_size - 1; // o stkFrameTop_ptr na verdade é o stack frame size, que indica a qtd de frames na stkframe.
//Teste
Execute(stkFrame_ptr, classHeap_ptr, dmSize_ptr);
//Deleta o frame.
deleteFrame(&stkFrame_ptr[aux_idx], &dmSize_ptr->stkHeap_size);
}
/**
* @brief
*
* @param class_ptr
* @param stkFrame_ptr
* @param dmSize_ptr
* @param classHeap_ptr
* @param mth_name
* @param mth_descriptor
*/
void callMethod(ClassFile *class_ptr, Frame *stkFrame_ptr, dataMSize_t *dmSize_ptr, ClassFile *classHeap_ptr, \
char *mth_name, char *mth_descriptor){
u2 method_idx = seekMethodInClass( class_ptr, mth_name, mth_descriptor );
if( method_idx == SEEK_NOTFOUND){
exit(1);
}
method_info *method_ptr = &class_ptr->methods[method_idx];
//Quem cria deleta.
createFrame(method_ptr, class_ptr, stkFrame_ptr, &dmSize_ptr->stkHeap_size);//Cria o frame para o método <clinit> da classe.
u2 aux_idx = dmSize_ptr->stkHeap_size - 1; // o stkFrameTop_ptr na verdade é o stack frame size, que indica a qtd de frames na stkframe.
//Teste
Execute(stkFrame_ptr, classHeap_ptr, dmSize_ptr);
//Deleta o frame.
deleteFrame(&stkFrame_ptr[aux_idx], &dmSize_ptr->stkHeap_size);
}
/** OK!
* @brief Busca no classFile por um métodos específico e retorna o indice para a tabela de métodos
*
* @param class_ptr ponteiro para um classFile
* @param methName_str nome do método que se deseja buscar
* @param methDescriptor_str descritor do método, ()V por exemplo
*
* @return retorna o índice na tabela de métodos do classFile
*/
u2 seekMethodInClass(ClassFile *class_ptr, char *methName_str, char *methDescriptor_str){
char *methodN;
char *methodD;
//char *bytes;
//u2 str_size;
for(int i = 0; i < class_ptr->methods_count; i++){
//str_size = class_ptr->constant_pool[class_ptr->methods[i].name_inex - 1].info.CONSTANT_Utf8_info.length;
//methodN = malloc( (str_size + 1)*sizeof(char) );
//bytes = class_ptr->constant_pool[class_ptr->methods[i].name_index - 1].info.CONSTANT_Utf8_info_bytes;
methodN = class_ptr->constant_pool[class_ptr->methods[i].name_index - 1].info.CONSTANT_Utf8_info.bytes;
methodD = class_ptr->constant_pool[class_ptr->methods[i].descriptor_index - 1].info.CONSTANT_Utf8_info.bytes;
if( !strcmp(methodN, methName_str) && !strcmp(methodD, methDescriptor_str) ){
return i;
}
/*for(int j = 0; j < str_size; j++){
methodN[j] = bytes[j];
}
methodN[str_size
*/
}
return SEEK_NOTFOUND;
}
/*SAMUEL - início*/
int findClass(ClassFile *classHeap_ptr, dataMSize_t dmSize, char* ClassName){
u2 clsHeapSize = dmSize.stkHeap_size;
u2 index;
for(int i=0; i < clsHeapSize; i++) {
index = classHeap_ptr[i].this_class;
if(strcmp(classHeap_ptr[i].constant_pool[index-1].info.CONSTANT_Utf8_info.bytes, ClassName) == 0) {
return i;
}
}
return SEEK_NOTFOUND;
}
u2 findCode(method_info *method) {
u2 i = 0;
while(method->attribute[i].tag != 1){
i++;
}
return i;
}
//Lembrar de enviar o dataMSize->stkHeap_size para o numFrames
void createFrame(method_info *method, ClassFile *Class, Frame *frame_ptr, u2 *numFrames) {
u2 i = *numFrames;
u2 codeIndex = 0;
codeIndex = findCode(method);
if (i < STKFRAME_MAX - 1) {
frame_ptr[i].pClass = Class;
frame_ptr[i].pMethod = method;
frame_ptr[i].code_length = method->attribute[codeIndex].info.Code_attribute.code_length;
frame_ptr[i].code = method->attribute[codeIndex].info.Code_attribute.code;
frame_ptr[i].pc = 0;
frame_ptr[i].sp = 0;
frame_ptr[i].stack_size = method->attribute[codeIndex].info.Code_attribute.max_stack;
frame_ptr[i].local_size = method->attribute[codeIndex].info.Code_attribute.max_locals;
frame_ptr[i].stack = malloc(frame_ptr[i].stack_size * sizeof(u4));
frame_ptr[i].local = malloc(frame_ptr[i].local_size * sizeof(u4));
/*TESTE*/
// frame_ptr[i - 1].pClass = Class;
// frame_ptr[i -1].pMethod = method;
// frame_ptr[i -1].code_length = Class->methods->attribute[codeIndex].info.Code_attribute.code_length;
// frame_ptr[i - 1].code = malloc(frame_ptr[i].code_length * sizeof(u1));
//
// frame_ptr[i - 1].pc = 0;
// frame_ptr[i - 1].sp = 0;
//
// frame_ptr[i - 1].stack_size = Class->methods->attribute[codeIndex].info.Code_attribute.max_stack;
// frame_ptr[i - 1].local_size = Class->methods->attribute[codeIndex].info.Code_attribute.max_locals;
// frame_ptr[i - 1].stack = malloc(frame_ptr[i].stack_size * sizeof(u4));
// frame_ptr[i - 1].local = malloc(frame_ptr[i].local_size * sizeof(u4));
//
(*numFrames)++;
} else {
printf("Frame não pode ser alocado, tamanho máximo atingido");
exit(1);
}
}
//Lembrar de enviar o dataMSize->stkHeap_size para o numFrames
void deleteFrame(Frame *frame_ptr, u2 *numFrames) {
//free(frame_ptr);
(*numFrames)--;
}
/*SAMUEL - FIM*/