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extended_asm.c
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extended_asm.c
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// This file manages extended assembly.
// asm <optional stuff> (
// "assembler template"
// : outputs
// : inputs
// : clobbers
// : labels)
// references https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html and https://www.felixcloutier.com/documents/gcc-asm.html
//
// Special format strings
// In addition to the tokens described by the input, output, and goto operands, these tokens have special meanings in the assembler template:
//
//‘%%’
// Outputs a single ‘%’ into the assembler code.
//
//‘%=’
// Outputs a number that is unique to each instance of the asm statement in the entire compilation. This option is useful when creating local labels and referring to them multiple times in a single template that generates multiple assembler instructions.
//
//‘%{’
//‘%|’
//‘%}’
// Outputs ‘{’, ‘|’, and ‘}’ characters (respectively) into the assembler code.
// When unescaped, these characters have special meaning to indicate multiple assembler dialects.
#include "chibicc.h"
#define EXTASM_C "extended_asm.c"
typedef struct
{
Token *input; // store the token corresponding to input
char *variableNumber; //store the variable %0, %1...
char *input_value; // store the immediate value
char *reg; // store the register that corresponds to the variable size
char *reg64; //store the register 64 bits
int index; // store the index
char letter; // store the letter corresponding to input
int offset; // store the offset
int size; // store the size to determine the operation to do ex movl movb movw movq
bool isVariable; // store true if it's a variable otherwise false for immediate value
bool isAddress; // store true if it's an address pointer
bool isArray; //true if it's an array variable
bool isStruct; //true if it's a struct variable
bool isToNegate; //true if the value should be negate
int indexArray; //store the index element of array
int offsetArray; //store the index of array
int offsetStruct; //store the offset of the struct
} AsmInput;
typedef struct
{
Token *output; // store the token corresponding to input
char *variableNumber; //store the variable %0, %1...
char *prefix; //= or +
char *reg; // store the register that corresponds to the variable size
char *reg64; //store the register 64 bits
char letter; // to store a b r
int index; // order in output
int size; // store the size to determine the operation to do
bool isRegister; // r
bool isMemory; // m
bool isAlpha; // if is not r neither m is considered Alpha
int offset; // store the offset
bool isVariable; // store true if it's a variable otherwise false for immediate value
bool isAddress; // store true if it's an address pointer
bool isArray; //true if it's an array variable
bool isStruct; //true if it's a struct variable
int indexArray; //store the index element of array
int offsetArray; //store the index of array
int offsetStruct; //store the offset of the struct
bool inputToGenerate; //true if it's the corresponding input should be generated
} AsmOutput;
typedef struct
{
char *templatestr;
//bool hasPercent;
} AsmTemplate;
typedef struct
{
char *clobber;
} AsmClobber;
typedef struct
{
AsmTemplate *template;
AsmOutput *output[10];
AsmInput *input[10];
AsmClobber *clobber[10];
int nboutput;
int nbinput;
int nbclobber;
int nblabel;
} AsmExtended;
typedef AsmExtended AsmExtended;
typedef enum
{
AT_TEMPLATE, // assembler template
AT_OUTPUT, // outputs
AT_INPUT, // inputs
AT_CLOBBER, // clobbers
AT_LABEL, // labels
} AsmType;
//
//+ means that the output is actually a read-write value.
//=& means that the output is an early-clobber output. Its initial value is unspecified.
//= means that the output is write-only.
//=@ccCOND is a special case of = that allows you to query the result of a condition code at the end of your assembly statement.
// typedef enum
// {
// CP_READWRITEREG = 1, // +r
// CP_READWRITEMEM, // +m
// CP_CLOBBEROUTPUTREG, // =&r
// CP_WRITEONLYREG, // =r
// CP_WRITEONLYMEM, // =m
// CP_WRITEONLYOTH, // =a =b =c...
// CP_COND, // =@ccCOND
// } ConstraintPrefix;
static AsmExtended *asmExt;
static int nbInput = 0;
static int nbOutput = 0;
static int nbClobber = 0;
static int nbLabel = 0;
static int asmtype = 0;
extern Context *ctx;
static bool hasInput = false;
static bool hasOutput = false;
static bool isToNegate = false;
char *extended_asm(Node *node, Token **rest, Token *tok, Obj *locals)
{
char *input_asm_str;
char *output_loading;
asmtype = 0;
nbInput = 0;
nbOutput = 0;
nbClobber = 0;
nbLabel = 0;
hasInput = false;
hasOutput = false;
char *template = tok->str;
char *asm_str = calloc(1, sizeof(char) * 10000);
ctx->filename = EXTASM_C;
ctx->funcname = "extended_asm";
//case __asm__ volatile ("" ::: "memory")
//case __asm__ __volatile__ ("rep; nop" ::: "memory");
//we generate a nop operation for each memory border defined
//if (strlen(template) == 0 || !strncmp(template, "rep; nop", 9)) {
if (strlen(template) == 0) {
while (!equal(tok->next, ")")) {
tok = tok->next;
}
*rest = tok->next;
ctx->line_no = __LINE__ + 1;
*rest = skip(tok->next, ")", ctx);
tok = *rest;
asm_str = "\nnop;\n";
return asm_str;
}
// allocate memory for all structs needed
asmExt = calloc(1, sizeof(AsmExtended));
asmExt->template = calloc(1, sizeof(AsmTemplate));
for (int i = 0; i < 10; i++)
asmExt->input[i] = calloc(1, sizeof(AsmInput));
for (int i = 0; i < 10; i++)
asmExt->output[i] = calloc(1, sizeof(AsmOutput));
for (int i = 0; i < 10; i++)
asmExt->clobber[i] = calloc(1, sizeof(AsmClobber));
//strncpy(asm_str, "", strlen(asm_str) + 1);
char *output_asm_str = calloc(1, sizeof(char) * 2500);
char *input_final = calloc(1, sizeof(char) * 2500);
char *input_for_output = calloc(1, sizeof(char) * 4000);
asmExt->template->templatestr = template;
// asmExt->template->hasPercent = check_template(template);
//clear the registerUsed array
clear_register_used();
//mark the register used if found in template
check_register_in_template(template);
while (!equal(tok->next, ";") && !equal(tok, ";"))
{
switch (asmtype)
{
case AT_TEMPLATE: // assembler template
break;
case AT_OUTPUT: // outputs
if (equal(tok, ":"))
break;
output_asm(node, rest, tok, locals);
// generate output instruction for each output variable
if (asmExt->output[nbOutput]->variableNumber) {
hasOutput = true;
output_loading = generate_output_asm(asmExt->output[nbOutput]->variableNumber);
// replace %9 by the correct register
if (!output_loading)
error("%s : %s:%d: error: in extended_asm function extended_asm :output_loading is null!", EXTASM_C, __FILE__, __LINE__);
if (!asmExt->output[nbOutput]->reg)
error("%s : %s:%d: error: in extended_asm function extended_asm :asmExt->output[nbOutput]->reg is null!", EXTASM_C, __FILE__, __LINE__);
output_loading = subst_asm(output_loading, asmExt->output[nbOutput]->reg, asmExt->output[nbOutput]->variableNumber);
//generate the ouput instruction
strncat(output_asm_str, output_loading, strlen(output_loading));
} else { //to manage the case of no output
tok = tok->next;
*rest = tok;
}
nbOutput++;
tok = *rest;
break;
case AT_INPUT: // inputs
// return %0, %1 or %x
if (equal(tok, ":"))
break;
input_asm(node, rest, tok, locals);
// generate input instruction to load the parameter into register
if (asmExt->input[nbInput]->variableNumber) {
hasInput = true;
input_asm_str = generate_input_asm(asmExt->input[nbInput]->variableNumber);
//replace %9, by the correct
if (!input_asm_str)
error("%s %s:%d: error: in extended_asm function extended_asm :input_asm_str is null!", EXTASM_C, __FILE__, __LINE__);
if (!asmExt->input[nbInput]->reg)
error("%s %s:%d: error: in extended_asm function extended_asm :asmExt->input[nbInput]->reg is null!", EXTASM_C, __FILE__, __LINE__);
input_asm_str = subst_asm(input_asm_str, asmExt->input[nbInput]->reg, asmExt->input[nbInput]->variableNumber);
// concatenate the input final strings to add to the assembly
strncat(input_final, input_asm_str, strlen(input_asm_str));
} else { //to manage the case of no input
tok = tok->next;
*rest = tok;
}
nbInput++;
tok = *rest;
break;
case AT_CLOBBER: // clobbers
if (equal(tok, ":"))
break;
asmExt->clobber[nbClobber]->clobber = tok->loc;
tok = tok->next;
// if (equal(tok, ","))
// tok = tok->next;
*rest = tok;
nbClobber++;
//error_tok(tok, "%s : in extended_asm function : clobber not managed yet!", EXTASM_C);
break;
case AT_LABEL: // labels
//nbLabel++;
tok = tok->next;
*rest = tok;
//error_tok(tok, "%s : in extended_asm function : label not managed yet!", EXTASM_C);
break;
default: // error
error_tok(tok, "%s : in extended_asm function : too much parameters or complex extended assembly not managed!", EXTASM_C);
}
if (equal(tok, ":"))
asmtype += 1;
tok = tok->next;
}
if (hasOutput) {
//replace each %9 by the correct output register
for (int i = 0; i < nbOutput; i++)
{
if (asmExt->output[i]->isAddress) {
char *tmp = calloc(1, sizeof(char) * 30);
strncat(tmp, "(", 2);
strncat(tmp, asmExt->output[i]->reg64, strlen(asmExt->output[i]->reg64) );
strncat(tmp, ")", 2);
asm_str = subst_asm(template, tmp, asmExt->output[i]->variableNumber);
free(tmp);
}else {
asm_str = subst_asm(template, asmExt->output[i]->reg, asmExt->output[i]->variableNumber);
}
}
}
if (hasInput) {
//replace each %9 by the correct input register
for (int i = 0; i < nbInput; i++)
{
if (asmExt->input[i]->isAddress) {
char *tmp = calloc(1, sizeof(char) * 30);
strncat(tmp, "(", 2);
strncat(tmp, asmExt->input[i]->reg64, strlen(asmExt->input[i]->reg64) );
strncat(tmp, ")", 2);
asm_str = subst_asm(template, tmp, asmExt->input[i]->variableNumber);
free(tmp);
}else
asm_str = subst_asm(template, asmExt->input[i]->reg, asmExt->input[i]->variableNumber);
}
//generate the input instructions before the output
if (input_final != NULL)
{
input_for_output = generate_input_for_output();
//input_for_output can be NULL if no input to generate for output
//generate first the input for output and then the input for the rest of the template
if (input_for_output != NULL && input_final != NULL) {
strncat(input_for_output, input_final, strlen(input_final));
strncpy(input_final, input_for_output, strlen(input_for_output) + 1);
strncat(input_final, asm_str, strlen(asm_str));
} else {
strncat(input_final, asm_str, strlen(asm_str));
}
asm_str = input_final;
}
}
//generate the output instructions
if (hasOutput && output_asm_str != NULL)
{
strncat(asm_str, output_asm_str, strlen(output_asm_str));
}
//replace special characters
// replace %% by %
// replace ‘%{’ by '{', ‘%|’ by '|' and ‘%}’ by '}'
asm_str = subst_asm(asm_str, " %", "%%");
asm_str = subst_asm(asm_str, " {", "%{");
asm_str = subst_asm(asm_str, " |", "%|");
asm_str = subst_asm(asm_str, " }", "%}");
if (isDebug)
printf("=====template=%s\n====asm_str=%s\n====input_final==%s\n====output_asm_str===%s\n", template, asm_str, input_final, output_asm_str);
*rest = tok;
// free memory
for (int i = 0; i < 10; i++)
free(asmExt->input[i]);
for (int i = 0; i < 10; i++)
free(asmExt->output[i]);
for (int i = 0; i < 10; i++)
free(asmExt->clobber[i]);
free(asmExt->template);
// free(input_for_output);
// free(output_asm_str);
// free(input_final);
free(asmExt);
return asm_str;
}
void output_asm(Node *node, Token **rest, Token *tok, Obj *locals)
{
VarScope *sc;
ctx->funcname = "output_asm";
while (!equal(tok->next, ":") && !equal(tok->next, ";"))
{
// register in write only mode
// check if the register constraint is followed by a variable like "=r" (val)
if (tok->kind == TK_STR)
{
if (!strncmp(tok->str, "=r", tok->len) || !strncmp(tok->str, "+r", tok->len))
{
asmExt->output[nbOutput]->isRegister = true;
if (!strncmp(tok->str, "=r", tok->len))
asmExt->output[nbOutput]->prefix = "=";
else {
asmExt->output[nbOutput]->prefix = "+";
}
asmExt->output[nbOutput]->reg = specific_register_available("%rax");
if (!asmExt->output[nbOutput]->reg)
error("%s : %s:%d: error: in output_asm function :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->output[nbOutput]->reg64 = asmExt->output[nbOutput]->reg;
asmExt->output[nbOutput]->letter = 'r';
}
else if (!strncmp(tok->str, "=m", tok->len) || !strncmp(tok->str, "+m", tok->len))
{
asmExt->output[nbOutput]->isMemory = true;
if (!strncmp(tok->str, "=m", tok->len))
asmExt->output[nbOutput]->prefix = "=";
else {
asmExt->output[nbOutput]->prefix = "+";
}
asmExt->output[nbOutput]->reg = specific_register_available("%rdi");
if (!asmExt->output[nbOutput]->reg)
error("%s : %s:%d: error: in output_asm function :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->output[nbOutput]->reg64 = asmExt->output[nbOutput]->reg;
asmExt->output[nbOutput]->letter = 'm';
asmExt->output[nbOutput]->inputToGenerate = true;
}
else if (!strncmp(tok->str, "=q", tok->len) || !strncmp(tok->str, "+q", tok->len))
{
asmExt->output[nbOutput]->isMemory = true;
if (!strncmp(tok->str, "=q", tok->len))
asmExt->output[nbOutput]->prefix = "=";
else {
asmExt->output[nbOutput]->prefix = "+";
}
asmExt->output[nbOutput]->reg = specific_register_available("%rdx");
if (!asmExt->output[nbOutput]->reg)
error("%s : %s:%d: error: in output_asm function :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->output[nbOutput]->reg64 = asmExt->output[nbOutput]->reg;
asmExt->output[nbOutput]->letter = 'q';
asmExt->output[nbOutput]->inputToGenerate = true;
}
// assuming that it's =a =b ???
else if (!strncmp(tok->str, "=a", tok->len) || !strncmp(tok->str, "=b", tok->len) || !strncmp(tok->str, "=c", tok->len) || !strncmp(tok->str, "=d", tok->len))
{
if (!strncmp(tok->str, "=a", tok->len))
{
asmExt->output[nbOutput]->prefix = "=";
asmExt->output[nbOutput]->reg = specific_register_available("%rax");
if (!asmExt->output[nbOutput]->reg)
error("%s : %s:%d: error: in output_asm function :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->output[nbOutput]->reg64 = asmExt->output[nbOutput]->reg;
asmExt->output[nbOutput]->letter = 'a';
}
else if (!strncmp(tok->str, "=b", tok->len))
{
asmExt->output[nbOutput]->prefix = "=";
asmExt->output[nbOutput]->reg = specific_register_available("%rbx");
if (!asmExt->output[nbOutput]->reg)
error("%s : %s:%d: error: in output_asm function :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->output[nbOutput]->reg64 = asmExt->output[nbOutput]->reg;
asmExt->output[nbOutput]->letter = 'b';
}
else if (!strncmp(tok->str, "=c", tok->len))
{
asmExt->output[nbOutput]->prefix = "=";
asmExt->output[nbOutput]->reg = specific_register_available("%rcx");
if (!asmExt->output[nbOutput]->reg)
error("%s : %s:%d: error: in output_asm function :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->output[nbOutput]->reg64 = asmExt->output[nbOutput]->reg;
asmExt->output[nbOutput]->letter = 'c';
}
else if (!strncmp(tok->str, "=d", tok->len))
{
asmExt->output[nbOutput]->prefix = "=";
asmExt->output[nbOutput]->reg = specific_register_available("%rdx");
if (!asmExt->output[nbOutput]->reg)
error("%s : %s:%d: error: in output_asm function :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->output[nbOutput]->reg64 = asmExt->output[nbOutput]->reg;
asmExt->output[nbOutput]->letter = 'd';
}
else {
tok = tok->next;
ctx->line_no = __LINE__ + 1;
*rest = skip(tok, ")", ctx);
return;
}
asmExt->output[nbOutput]->isAlpha = true;
//asmExt->output[nbOutput]->prefix = "=";
//asmExt->output[nbOutput]->variableNumber = retrieveVariableNumber(nbOutput);
}
else if (!strncmp(tok->str, "+a", tok->len) || !strncmp(tok->str, "+b", tok->len) || !strncmp(tok->str, "+c", tok->len) || !strncmp(tok->str, "+d", tok->len))
{
if (!strncmp(tok->str, "+a", tok->len))
{
asmExt->output[nbOutput]->prefix = "+";
asmExt->output[nbOutput]->reg = specific_register_available("%rax");
if (!asmExt->output[nbOutput]->reg)
error("%s : %s:%d: error: in output_asm function :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->output[nbOutput]->reg64 = asmExt->output[nbOutput]->reg;
asmExt->output[nbOutput]->letter = 'a';
}
else if (!strncmp(tok->str, "+b", tok->len))
{
asmExt->output[nbOutput]->prefix = "+";
asmExt->output[nbOutput]->reg = specific_register_available("%rbx");
if (!asmExt->output[nbOutput]->reg)
error("%s : %s:%d: error: in output_asm function :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->output[nbOutput]->reg64 = asmExt->output[nbOutput]->reg;
asmExt->output[nbOutput]->letter = 'b';
}
else if (!strncmp(tok->str, "+c", tok->len))
{
asmExt->output[nbOutput]->prefix = "+";
asmExt->output[nbOutput]->reg = specific_register_available("%rcx");
if (!asmExt->output[nbOutput]->reg)
error("%s : %s:%d: error: in output_asm function :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->output[nbOutput]->reg64 = asmExt->output[nbOutput]->reg;
asmExt->output[nbOutput]->letter = 'c';
}
else if (!strncmp(tok->str, "+d", tok->len))
{
asmExt->output[nbOutput]->prefix = "+";
asmExt->output[nbOutput]->reg = specific_register_available("%rdx");
if (!asmExt->output[nbOutput]->reg)
error("%s : %s:%d: error: in output_asm function :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->output[nbOutput]->reg64 = asmExt->output[nbOutput]->reg;
asmExt->output[nbOutput]->letter = 'd';
}
else {
tok = tok->next;
ctx->line_no = __LINE__ + 1;
*rest = skip(tok, ")", ctx);
return;
}
asmExt->output[nbOutput]->isAlpha = true;
//asmExt->output[nbOutput]->prefix = "=";
//asmExt->output[nbOutput]->variableNumber = retrieveVariableNumber(nbOutput);
}
//D for destination operand
else if (!strncmp(tok->str, "=D", tok->len) || !strncmp(tok->str, "+D", tok->len))
{
asmExt->output[nbOutput]->isMemory = true;
if (!strncmp(tok->str, "=D", tok->len))
asmExt->output[nbOutput]->prefix = "=";
else {
asmExt->output[nbOutput]->prefix = "+";
}
asmExt->output[nbOutput]->reg = specific_register_available("%rax");
if (!asmExt->output[nbOutput]->reg)
error("%s : %s:%d: error: in output_asm function :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->output[nbOutput]->reg64 = asmExt->output[nbOutput]->reg;
asmExt->output[nbOutput]->letter = 'D';
asmExt->output[nbOutput]->inputToGenerate = true;
}
//S for source operand
else if (!strncmp(tok->str, "=S", tok->len) || !strncmp(tok->str, "+S", tok->len))
{
asmExt->output[nbOutput]->isMemory = true;
if (!strncmp(tok->str, "=S", tok->len))
asmExt->output[nbOutput]->prefix = "=";
else {
asmExt->output[nbOutput]->prefix = "+";
}
asmExt->output[nbOutput]->reg = specific_register_available("%rax");
if (!asmExt->output[nbOutput]->reg)
error("%s : %s:%d: error: in output_asm function :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->output[nbOutput]->reg64 = asmExt->output[nbOutput]->reg;
asmExt->output[nbOutput]->letter = 'S';
asmExt->output[nbOutput]->inputToGenerate = true;
}
asmExt->output[nbOutput]->variableNumber = retrieveVariableNumber(nbOutput);
asmExt->output[nbOutput]->index = nbOutput;
}
// skip the comma
else if (equal(tok, ",")) {
ctx->line_no = __LINE__ + 1;
tok = skip(tok, ",", ctx);
}
// manage the variable inside parenthesis
else if (equal(tok, "("))
{
ctx->line_no = __LINE__ + 1;
tok = skip(tok, "(", ctx);
// check if the variable is defined
if (tok->kind == TK_IDENT)
{
//TODO potential issue if several variables with same name inside different functions.
//need to check if the variable is in the correct function
asmExt->output[nbOutput]->output = tok;
sc = find_var(tok);
if (!sc)
error_tok(tok, "%s %d: in output_asm function : variable undefined", EXTASM_C, __LINE__);
if (!sc->var->ty)
error_tok(tok, "%s %d: in output_asm function : variable type unknown", EXTASM_C, __LINE__);
// retrieve the size of the variable to determine the register to use here we use RAX variation
asmExt->output[nbOutput]->size = sc->var->ty->size;
if (!asmExt->output[nbOutput]->reg)
error_tok(tok, "%s %d: in output_asm function : reg is null extended assembly not managed yet", EXTASM_C, __LINE__);
asmExt->output[nbOutput]->reg = update_register_size(asmExt->output[nbOutput]->reg, asmExt->output[nbOutput]->size);
asmExt->output[nbOutput]->isVariable = true;
asmExt->output[nbOutput]->output = tok;
asmExt->output[nbOutput]->variableNumber = retrieveVariableNumber(nbOutput);
if (sc->var->funcname) {
update_offset(sc->var->funcname, locals);
asmExt->output[nbOutput]->offset = sc->var->offset;
}
else {
asmExt->output[nbOutput]->offset = 0;
}
//managing specific case of arrays
if (sc->var->ty->kind == TY_ARRAY) {
ctx->line_no = __LINE__ + 1;
tok = skip(tok->next, "[", ctx);
asmExt->output[nbOutput]->isArray = true;
asmExt->output[nbOutput]->isAddress = false;
asmExt->output[nbOutput]->indexArray = tok->val;
asmExt->output[nbOutput]->size = sc->var->ty->base->size;
if (!asmExt->output[nbOutput]->reg)
error("%s : %s:%d: error: in output_asm function :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->output[nbOutput]->reg = update_register_size(asmExt->output[nbOutput]->reg, asmExt->output[nbOutput]->size);
//calculate the offset for each element from the bottom to the top r[0] has the lowest offset example -48, r[1] - 44, r[2] -40, r[3] - 36
asmExt->output[nbOutput]->offset = (sc->var->offset ) + (asmExt->output[nbOutput]->indexArray * asmExt->output[nbOutput]->size);
asmExt->output[nbOutput]->offsetArray = sc->var->offset;
tok = tok->next;
ctx->line_no = __LINE__ + 1;
tok = skip(tok, "]", ctx);
ctx->line_no = __LINE__ + 1;
*rest = skip(tok, ")", ctx);
return;
}
//special case of array pointer it means that the parameter received is an address.
if (sc->var->ty->kind == TY_PTR && equal(tok->next, "[")) {
ctx->line_no = __LINE__ + 1;
tok = skip(tok->next, "[", ctx);
asmExt->output[nbOutput]->isArray = true;
asmExt->output[nbOutput]->isAddress = true;
asmExt->output[nbOutput]->indexArray = tok->val;
asmExt->output[nbOutput]->size = sc->var->ty->base->size;
if (!asmExt->output[nbOutput]->reg)
error_tok(tok, "%s %d: in output_asm function : reg is null extended assembly not managed yet", EXTASM_C, __LINE__);
asmExt->output[nbOutput]->reg = update_register_size(asmExt->output[nbOutput]->reg, asmExt->output[nbOutput]->size);
//calculate the offset for each element from the bottom to the top r[0] has the lowest offset example -48, r[1] - 44, r[2] -40, r[3] - 36
asmExt->output[nbOutput]->offset = (asmExt->output[nbOutput]->indexArray * asmExt->output[nbOutput]->size);
asmExt->output[nbOutput]->offsetArray = sc->var->offset;
tok = tok->next;
ctx->line_no = __LINE__ + 1;
tok = skip(tok, "]", ctx);
ctx->line_no = __LINE__ + 1;
*rest = skip(tok, ")", ctx);
return;
}
//Trying to fix ISS-164 special case of ptr->value form (ptr to a struct)
if (sc->var->ty->kind == TY_PTR && equal(tok->next, "->")) {
if (!sc->var->ty->base)
error_tok(tok, "%s %d: in output_asm function : expecting struct base but base is null!", EXTASM_C, __LINE__);
ctx->line_no = __LINE__ + 1;
asmExt->output[nbOutput]->output = tok;
tok = skip(tok->next, "->", ctx);
Token * tokmbr = tok;
// retrieve the size of the variable to determine the register to use here we use RAX variation
asmExt->output[nbOutput]->isAddress = true;
asmExt->output[nbOutput]->isStruct = true;
asmExt->output[nbOutput]->size = sc->var->ty->size;
if (!asmExt->output[nbOutput]->reg)
error_tok(tok, "%s %d: in output_asm function : reg is null extended assembly not managed yet", EXTASM_C, __LINE__);
asmExt->output[nbOutput]->reg = update_register_size(asmExt->output[nbOutput]->reg, asmExt->output[nbOutput]->size);
asmExt->output[nbOutput]->variableNumber = retrieveVariableNumber(nbOutput);
if (!sc->var->ty->base->members)
error_tok(tok, "%s %d: in output_asm function : expecting members but members is null", EXTASM_C, __LINE__);
if (sc->var->funcname) {
update_offset(sc->var->funcname, locals);
asmExt->output[nbOutput]->offset = sc->var->offset;
asmExt->output[nbOutput]->offsetStruct = sc->var->ty->base->members->offset ;
}
else {
asmExt->output[nbOutput]->offset = 0;
}
//need to update the specific struct field offset
char *toktmp = calloc(1, sizeof(char) * 300);
for (Member *mbr = sc->var->ty->base->members; mbr; mbr = mbr->next) {
if (mbr->name->len > 59)
error_tok(tok, "%s %d %d: in output_asm function : not enough size for toktmp", EXTASM_C, __LINE__, mbr->name->len);
strncat(toktmp, mbr->name->loc, mbr->name->len);
if (equal(tokmbr, toktmp)) {
asmExt->output[nbOutput]->offsetStruct = mbr->offset ;
asmExt->output[nbOutput]->size = mbr->ty->size ;
if (!asmExt->output[nbOutput]->reg)
error_tok(tok, "%s %d: in output_asm function : reg is null extended assembly not managed yet", EXTASM_C, __LINE__);
asmExt->output[nbOutput]->reg = update_register_size(asmExt->output[nbOutput]->reg, asmExt->output[nbOutput]->size);
}
}
tok = tok->next;
ctx->line_no = __LINE__ + 1;
*rest = skip(tok, ")", ctx);
return;
}
// skip the variable to go to next token that should be a ")"
// tok = tok->next;
tok = tok->next;
ctx->line_no = __LINE__ + 1;
if (!equal(tok, ")"))
error_tok(tok, "%s %d: in output_asm function : extended assembly not managed yet", EXTASM_C, __LINE__);
*rest = skip(tok, ")", ctx);
return;
}
// pointer
else if (equal(tok, "*"))
{
consume(&tok, tok, "*");
if (tok->kind == TK_IDENT)
{
asmExt->output[nbOutput]->isAddress = true;
asmExt->output[nbOutput]->output = tok;
sc = find_var(tok);
if (!sc)
error_tok(tok, "%s %d: in output_asm function : variable undefined2", EXTASM_C, __LINE__);
if (!sc->var->ty)
error_tok(tok, "%s %d: in output_asm function : variable type unknown2", EXTASM_C, __LINE__);
// retrieve the size of the variable to determine the register to use here we use RAX variation
// skip the variable to go to next token that should be a ")"
asmExt->output[nbOutput]->size = sc->var->ty->pointertype->size;
if (sc->var->funcname) {
update_offset(sc->var->funcname, locals);
asmExt->output[nbOutput]->offset = sc->var->offset;
} else {
asmExt->output[nbOutput]->offset = 0;
}
if (!asmExt->output[nbOutput]->reg)
error_tok(tok, "%s %d: in output_asm function : reg is null extended assembly not managed yet", EXTASM_C, __LINE__);
asmExt->output[nbOutput]->reg = update_register_size(asmExt->output[nbOutput]->reg, asmExt->output[nbOutput]->size);
asmExt->output[nbOutput]->variableNumber = retrieveVariableNumber(nbOutput);
tok = tok->next;
ctx->funcname = "output_asm";
ctx->line_no = __LINE__ + 1 ;
*rest = skip(tok, ")", ctx);
return;
}
}
}
tok = tok->next;
*rest = tok;
}
return;
}
void input_asm(Node *node, Token **rest, Token *tok, Obj *locals)
{
ctx->funcname = "input_asm";
VarScope *sc;
char *input_value = calloc(1, sizeof(char) * 300);
asmExt->input[nbInput]->offset = 0;
while (!equal(tok->next, ":") && !equal(tok->next, ";"))
{
// register in write only mode
if (tok->kind == TK_STR && !strncmp(tok->str, "0", tok->len))
{
asmExt->input[nbInput]->variableNumber = retrieveVariableNumber(0);
asmExt->input[nbInput]->index = 0;
asmExt->input[nbInput]->reg = asmExt->output[0]->reg;
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->output[0]->reg64;
}
else if (tok->kind == TK_STR && !strncmp(tok->str, "1", tok->len))
{
asmExt->input[nbInput]->variableNumber = retrieveVariableNumber(1);
asmExt->input[nbInput]->index = 1;
asmExt->input[nbInput]->reg = asmExt->output[1]->reg;
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->output[1]->reg64;
}
else if (tok->kind == TK_STR && !strncmp(tok->str, "2", tok->len))
{
asmExt->input[nbInput]->variableNumber = retrieveVariableNumber(2);
asmExt->input[nbInput]->index = 2;
asmExt->input[nbInput]->reg = asmExt->output[2]->reg;
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->output[2]->reg64;
}
else if (tok->kind == TK_STR && !strncmp(tok->str, "3", tok->len))
{
asmExt->input[nbInput]->variableNumber = retrieveVariableNumber(3);
asmExt->input[nbInput]->index = 3;
asmExt->input[nbInput]->reg = asmExt->output[3]->reg;
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->output[3]->reg64;
}
else if (tok->kind == TK_STR && !strncmp(tok->str, "a", tok->len))
{
asmExt->input[nbInput]->variableNumber = retrieveVariableNumber(retrieve_output_index_from_letter('a'));
asmExt->input[nbInput]->index = nbOutput + nbInput;
asmExt->input[nbInput]->letter = 'a';
//=====ISS-156 case we have no output for the letter
if (retrieve_output_index_from_letter('a') == -1) {
asmExt->input[nbInput]->reg = specific_register_available("%rax");
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->input[nbInput]->reg;
}
else {
asmExt->input[nbInput]->reg = asmExt->output[retrieve_output_index_from_letter('a')]->reg;
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->output[retrieve_output_index_from_letter('a')]->reg64;
}
}
else if (tok->kind == TK_STR && !strncmp(tok->str, "b", tok->len))
{
asmExt->input[nbInput]->variableNumber = retrieveVariableNumber(retrieve_output_index_from_letter('b'));
asmExt->input[nbInput]->index = nbOutput + nbInput;
asmExt->input[nbInput]->letter = 'b';
//=====ISS-156 case we have no output for the letter
if (retrieve_output_index_from_letter('b') == -1) {
asmExt->input[nbInput]->reg = specific_register_available("%rbx");
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->input[nbInput]->reg;
}
else {
asmExt->input[nbInput]->reg = asmExt->output[retrieve_output_index_from_letter('b')]->reg;
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->output[retrieve_output_index_from_letter('b')]->reg64;
}
}
else if (tok->kind == TK_STR && !strncmp(tok->str, "c", tok->len))
{
asmExt->input[nbInput]->variableNumber = retrieveVariableNumber(retrieve_output_index_from_letter('c'));
asmExt->input[nbInput]->index = nbOutput + nbInput;
asmExt->input[nbInput]->letter = 'c';
//=====ISS-156 case we have no output for the letter
if (retrieve_output_index_from_letter('c') == -1) {
asmExt->input[nbInput]->reg = specific_register_available("%rcx");
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->input[nbInput]->reg;
}
else {
asmExt->input[nbInput]->reg = asmExt->output[retrieve_output_index_from_letter('c')]->reg;
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->output[retrieve_output_index_from_letter('c')]->reg64;
}
}
else if (tok->kind == TK_STR && !strncmp(tok->str, "d", tok->len))
{
asmExt->input[nbInput]->variableNumber = retrieveVariableNumber(retrieve_output_index_from_letter('d'));
asmExt->input[nbInput]->index = nbOutput + nbInput;
asmExt->input[nbInput]->letter = 'd';
//=====ISS-156 case we have no output for the letter
if (retrieve_output_index_from_letter('d') == -1) {
asmExt->input[nbInput]->reg = specific_register_available("%rdx");
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->input[nbInput]->reg;
}
else {
asmExt->input[nbInput]->reg = asmExt->output[retrieve_output_index_from_letter('d')]->reg;
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->output[retrieve_output_index_from_letter('d')]->reg64;
}
}
else if (tok->kind == TK_STR && !strncmp(tok->str, "m", tok->len))
{
asmExt->input[nbInput]->variableNumber = retrieveVariableNumber(nbOutput + nbInput);
asmExt->input[nbInput]->index = nbOutput + nbInput;
asmExt->input[nbInput]->reg = specific_register_available("%rdi");
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->input[nbInput]->reg;
asmExt->input[nbInput]->letter = 'm';
}
else if (tok->kind == TK_STR && !strncmp(tok->str, "q", tok->len))
{
asmExt->input[nbInput]->variableNumber = retrieveVariableNumber(nbOutput + nbInput);
asmExt->input[nbInput]->index = nbOutput + nbInput;
asmExt->input[nbInput]->reg = specific_register_available("%r10");
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->input[nbInput]->reg;
asmExt->input[nbInput]->letter = 'q';
}
else if (tok->kind == TK_STR && !strncmp(tok->str, "r", tok->len))
{
asmExt->input[nbInput]->variableNumber = retrieveVariableNumber(nbOutput + nbInput);
asmExt->input[nbInput]->index = nbOutput + nbInput;
asmExt->input[nbInput]->reg = specific_register_available("%r8");
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->input[nbInput]->reg;
asmExt->input[nbInput]->letter = 'r';
}
//D for destination operand
else if (tok->kind == TK_STR && !strncmp(tok->str, "D", tok->len))
{
asmExt->input[nbInput]->variableNumber = retrieveVariableNumber(nbOutput + nbInput);
asmExt->input[nbInput]->index = nbOutput + nbInput;
asmExt->input[nbInput]->reg = specific_register_available("%rdx");
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->input[nbInput]->reg;
asmExt->input[nbInput]->letter = 'D';
}
//S for source operand
else if (tok->kind == TK_STR && !strncmp(tok->str, "S", tok->len))
{
asmExt->input[nbInput]->variableNumber = retrieveVariableNumber(nbOutput + nbInput);
asmExt->input[nbInput]->index = nbOutput + nbInput;
asmExt->input[nbInput]->reg = specific_register_available("%r11");
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg64 = asmExt->input[nbInput]->reg;
asmExt->input[nbInput]->letter = 'S';
}
else if (equal(tok, "("))
{
ctx->line_no = __LINE__ + 1;
tok = skip(tok, "(", ctx);
// check if the variable is defined
if (equal(tok, "-"))
{
isToNegate = true;
consume(&tok, tok, "-");
}
if (tok->kind == TK_IDENT)
{
if (isToNegate) {
asmExt->input[nbInput]->isToNegate = isToNegate;
isToNegate = false;
}
sc = find_var(tok);
if (!sc)
error_tok(tok, "%s %d: in input_asm function : variable undefined", EXTASM_C, __LINE__);
if (!sc->var->ty)
error_tok(tok, "%s %d: in input_asm function : variable type unknown", EXTASM_C, __LINE__);
asmExt->input[nbInput]->input = tok;
asmExt->input[nbInput]->isVariable = true;
asmExt->input[nbInput]->size = sc->var->ty->size;
if (sc->var->funcname) {
update_offset(sc->var->funcname, locals);
asmExt->input[nbInput]->offset = sc->var->offset;
}
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg = update_register_size(asmExt->input[nbInput]->reg, asmExt->input[nbInput]->size);
//managing specific case of arrays
if (sc->var->ty->kind == TY_ARRAY) {
ctx->line_no = __LINE__ + 1;
tok = skip(tok->next, "[", ctx);
asmExt->input[nbInput]->isArray = true;
asmExt->input[nbInput]->indexArray = tok->val;
asmExt->input[nbInput]->isAddress = false;
asmExt->input[nbInput]->size = sc->var->ty->base->size;
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg = update_register_size(asmExt->input[nbInput]->reg, asmExt->input[nbInput]->size);
//calculate the offset for each element from the bottom to the top r[0] has the lowest offset example -48, r[1] - 44, r[2] -40, r[3] - 36
asmExt->input[nbInput]->offset = (sc->var->offset ) + (asmExt->input[nbInput]->indexArray * asmExt->input[nbInput]->size);
asmExt->input[nbInput]->offsetArray = sc->var->offset;
tok = tok->next;
ctx->line_no = __LINE__ + 1;
tok = skip(tok, "]", ctx);
ctx->line_no = __LINE__ + 1;
*rest = skip(tok, ")", ctx);
return;
}
if (sc->var->ty->kind == TY_PTR && equal(tok->next, "[")) {
ctx->line_no = __LINE__ + 1;
tok = skip(tok->next, "[", ctx);
asmExt->input[nbInput]->isArray = true;
asmExt->input[nbInput]->isAddress = true;
asmExt->input[nbInput]->indexArray = tok->val;
asmExt->input[nbInput]->size = sc->var->ty->base->size;
if (!asmExt->input[nbInput]->reg)
error("%s : %s:%d: error: in input_asm function input_asm :reg is null!", EXTASM_C, __FILE__, __LINE__);
asmExt->input[nbInput]->reg = update_register_size(asmExt->input[nbInput]->reg, asmExt->input[nbInput]->size);
//calculate the offset for each element from the bottom to the top r[0] has the lowest offset example -48, r[1] - 44, r[2] -40, r[3] - 36
asmExt->input[nbInput]->offset = (asmExt->input[nbInput]->indexArray * asmExt->input[nbInput]->size);
asmExt->input[nbInput]->offsetArray = sc->var->offset;
tok = tok->next;
ctx->line_no = __LINE__ + 1;
tok = skip(tok, "]", ctx);
ctx->line_no = __LINE__ + 1;
*rest = skip(tok, ")", ctx);
return;
}