270 lines
11 KiB
C
270 lines
11 KiB
C
#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#include "parser.h"
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#include "a64instruction/a64instruction.h"
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//takes input string, read from asm file and returns
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//input as an a64 instruction
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//TODO:
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// - use string matching to get opcode, and operands (DONE)
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// - check operand count (DONE)
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// - match opcode to a64 struct types (DONE)
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// - count operands and match type/values (DONE)
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// - generate final a64inst and return (TODO: DP instrs)
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// - ASK ABOUT OFFSET CALCULATION
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// - CREATE FUNC TO TIDY UP OPERANDS IN DP
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int isOperandRegister(char *operand){
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return((strcmp(&(operand[0]), "x")==0) || (strcmp(&(operand[0]), "w")==0));
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}
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//calculate offsets from string
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void calcluateAddressFormat(a64inst_instruction *instr, char *operandList[], int numOperands){
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char *endptr;
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uint8_t base = strtol(&(operandList[1][2]), &endptr, 10);
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instr->data.SingleTransferData.processOpData.singleDataTransferData.base = base;
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if(strcmp(&(operandList[2][strlen(operandList[1])-1]), "!")==0){
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instr->data.SingleTransferData.processOpData.singleDataTransferData.addressingMode = a64inst_PRE_INDEXED;
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instr->data.SingleTransferData.processOpData.singleDataTransferData.a64inst_addressingModeData.indexedOffset = strtol(&(operandList[2][1]), &endptr, 10);
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} else if(strcmp(&(operandList[1][strlen(operandList[0])-1]), "]") == 0) {
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//post-indexed
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instr->data.SingleTransferData.processOpData.singleDataTransferData.addressingMode = a64inst_POST_INDEXED;
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instr->data.SingleTransferData.processOpData.singleDataTransferData.a64inst_addressingModeData.indexedOffset = strtol(&(operandList[2][1]), &endptr, 10);
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} else if( (isOperandRegister(&(operandList[2][0])) == 1)
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|| (isOperandRegister(&(operandList[2][0])) == 1)){
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//register
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instr->data.SingleTransferData.processOpData.singleDataTransferData.addressingMode = a64inst_REGISTER_OFFSET;
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instr->data.SingleTransferData.processOpData.singleDataTransferData.a64inst_addressingModeData.offsetReg = strtol(&(operandList[2][1]), &endptr, 10);
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} else {
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instr->data.SingleTransferData.processOpData.singleDataTransferData.addressingMode = a64inst_UNSIGNED_OFFSET;
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if(numOperands==3){
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int offset = strtol(&(operandList[2][1]), &endptr, 10);
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if(instr->data.SingleTransferData.regType == 1){
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instr->data.SingleTransferData.processOpData.singleDataTransferData.a64inst_addressingModeData.unsignedOffset = offset/8;
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} else {
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instr->data.SingleTransferData.processOpData.singleDataTransferData.a64inst_addressingModeData.unsignedOffset = offset/4;
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}
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}
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}
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}
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void generateLoadStoreOperands(a64inst_instruction *instr, char *opcode, char *operandList[], int numOperands){
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switch(instr->type){
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case a64inst_SINGLETRANSFER:
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if(strcmp(&(operandList[0][0]), "x")==0){
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//x-register
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instr->data.SingleTransferData.regType = 1;
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} else {
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instr->data.SingleTransferData.regType = 0;
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}
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char *endptr;
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instr->data.SingleTransferData.target = strtol(&(operandList[0][0])+1, &endptr, 10);
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calcluateAddressFormat(instr, operandList, numOperands);
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break;
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case a64inst_LOADLITERAL:
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break;
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default:
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break;
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}
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}
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void generateBranchOperands(a64inst_instruction *instr, char* opcode, char *operandList[]){
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char *endptr;
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switch(instr->data.BranchData.BranchType){
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case a64inst_UNCONDITIONAL:
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//define and sign extend immediate offset
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//use symbol table
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printf("unconditional");
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break;
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case a64inst_REGISTER:
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instr->data.BranchData.processOpData.registerData.src = strtol(operandList[0] + 1, &endptr, 10);
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break;
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case a64inst_CONDITIONAL:
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{
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char *condition = NULL;
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condition = strcpy(condition, opcode);
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condition += 2;
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if(strcmp(condition, "eq")==0){
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instr->data.BranchData.processOpData.conditionalData.cond = EQ;
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} else if (strcmp(condition, "ne")==0){
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instr->data.BranchData.processOpData.conditionalData.cond = NE;
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} else if (strcmp(condition, "ge")==0){
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instr->data.BranchData.processOpData.conditionalData.cond = GE;
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} else if (strcmp(condition, "lt")==0){
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instr->data.BranchData.processOpData.conditionalData.cond = LT;
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} else if (strcmp(condition, "gt")==0){
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instr->data.BranchData.processOpData.conditionalData.cond = GT;
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} else if (strcmp(condition, "le")==0){
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instr->data.BranchData.processOpData.conditionalData.cond = LE;
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} else if (strcmp(condition, "al")==0){
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instr->data.BranchData.processOpData.conditionalData.cond = AL;
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}
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break;
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//calculate offset from symbol table.
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}
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}
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}
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int classifyDPInst(char *operandList[]){
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return(isOperandRegister(operandList[0]) &&
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isOperandRegister(operandList[1]) &&
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isOperandRegister(operandList[2]));
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}
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void classifyOpcode(char* opcode, a64inst_instruction *instr, char *operandList[], int numOperands){
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int isUnconditional = strcmp(opcode, "b");
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int isRegister = strcmp(opcode, "br");
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int isLoad = strcmp(opcode, "ldr");
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int isStore = strcmp(opcode, "str");
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if(isUnconditional == 0 ||
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isRegister == 0 ||
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strncmp(opcode, "b.", 2) == 0){
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instr->type = a64inst_BRANCH;
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if(isUnconditional){
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instr->data.BranchData.BranchType = a64inst_UNCONDITIONAL;
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} else if (isRegister){
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instr->data.BranchData.BranchType = a64inst_REGISTER;
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} else {
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instr->data.BranchData.BranchType = a64inst_CONDITIONAL;
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}
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generateBranchOperands(instr, opcode, operandList);
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} else if(isLoad == 0 || isStore == 0){
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//loading/storing instruction; classify operands
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char *address = operandList[1];
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if( *address == '['){
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//type is register
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instr->type = a64inst_SINGLETRANSFER;
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instr->data.SingleTransferData.SingleTransferOpType = a64inst_SINGLE_TRANSFER_SINGLE_DATA_TRANSFER;
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if(isLoad == 0){
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instr->data.SingleTransferData.processOpData.singleDataTransferData.transferType = a64inst_LOAD;
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} else {
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instr->data.SingleTransferData.processOpData.singleDataTransferData.transferType = a64inst_STORE;
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}
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} else {
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instr->type = a64inst_LOADLITERAL;
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if(operandList[0][0] =='#'){
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//offset is immediate
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char *immOffset = NULL;
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immOffset = strcpy(immOffset, operandList[0]);
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immOffset++;
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char *endptr = NULL;
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int offset = strtol(immOffset, &endptr, 10);
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instr->data.SingleTransferData.processOpData.loadLiteralData.offset = offset;
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} else {
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//offset is literal, use symbol table and calculate difference
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}
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}
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} else {
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if(classifyDPInst(operandList)){
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instr->type = a64inst_DPREGISTER;
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} else {
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instr->type = a64inst_DPIMMEDIATE;
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}
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}
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}
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void tokeniseOperands(char* str, int *operandCount, char *operands[], int *numOperands){
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assert(str != NULL);
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char operandsDupe[strlen(str)+1];
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strcpy(operandsDupe, str);
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char *operand = strtok(operandsDupe, OPERAND_DELIMITER);
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operands[0] = operand;
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while (operand != NULL){
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*operandCount = *(operandCount)+1;
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operand = strtok(NULL, OPERAND_DELIMITER);
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operands[*(operandCount)] = operand;
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}
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*(numOperands) = *(operandCount)+1;
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}
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//takes inputted assembly line and returns a
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//pointer to an abstract representation of the instruction
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void parser_instruction(char asmLine[], a64inst_instruction *instr) {
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int numOperands = 0;
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if (instr == NULL){
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exit(EXIT_FAILURE);
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}
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if(strcmp(asmLine, HALT_ASM_CMD) == 0){
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instr->type = a64inst_HALT;
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return;
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}
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//"opcode operand1, {operand2}, ..."
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//duplicated as strtok modifies the input string
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char stringptr[strlen(asmLine) + 1];
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strcpy(stringptr, asmLine);
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char *opcode = strtok(stringptr, " ");
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char *operands = strtok(NULL, "");
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if(strcmp(opcode, ".int") == 0){
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//type is directive
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instr->type = a64inst_DIRECTIVE;
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} else if(opcode[strlen(opcode)-1]== ':') {
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//type is label
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//add to symbol table
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instr->type = a64inst_LABEL;
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char *opcodeCpy = NULL;
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opcodeCpy = strcpy(opcodeCpy, opcode);
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char *labelData = strtok(opcodeCpy, ":");
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instr->data.LabelData.label = labelData;
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} else {
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//type is instruction
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int operandCount = 0;
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char *operandList[4];
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//generate list of operands
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tokeniseOperands(operands, &operandCount, operandList, &numOperands);
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//categorise instruction type from opcode and operands
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classifyOpcode(opcode, instr, operandList, operandCount);
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//define struct values according to operands and type
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switch(instr->type){
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case a64inst_BRANCH:
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generateBranchOperands(instr, opcode, operandList);
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break;
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case a64inst_SINGLETRANSFER:
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generateLoadStoreOperands(instr, opcode, operandList, numOperands);
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break;
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case a64inst_LOADLITERAL:
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generateLoadStoreOperands(instr, opcode, operandList, numOperands);
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break;
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case a64inst_DPREGISTER:
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//generate DP operands;
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break;
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case a64inst_DPIMMEDIATE:
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//generate DP operands;
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break;
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default:
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printf("INVALID INSTRUCTION");
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break;
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}
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}
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}
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// Takes an array of strings, each string representing an assembly instruction.
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// Returns an array of a64inst_instruction pointers, each representing an instruction.
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a64inst_instruction *parse(char **asmLines, int lineCount) {
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a64inst_instruction *instructions = malloc(sizeof(a64inst_instruction) * lineCount);
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int i = 0;
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while (asmLines[i] != NULL) {
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parser_instruction(asmLines[i], &instructions[i]);
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i++;
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}
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return instructions;
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}
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