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compiler.c
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compiler.c
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#include <stdarg.h>
#include "ast.h"
#include "types.h"
#include "token.h"
#include "std.h"
#include "compile.h"
#include "rhd/linked_list.h"
#include "rhd/hash_map.h"
#include "codegen.h"
//TODO: FIXME this is not really "safe", but if just compile once then exit the process this is fine.
//if you have multiple instances of the compiler running simultaneously then you should fix this.
static codegen_t *cg = NULL;
struct ast_node *get_struct_member_info(compiler_t* ctx, struct ast_struct_decl *decl, const char *member_name, int *offset, int *size);
static void set8(compiler_t *ctx, int offset, u8 op)
{
ctx->instr[offset] = op;
}
static void set32(compiler_t *ctx, int offset, u32 value)
{
u32 *ptr = (u32*)&ctx->instr[offset];
*ptr = value;
}
static void db(compiler_t *ctx, u8 op)
{
heap_string_push(&ctx->instr, op);
}
static void dd(compiler_t *ctx, u32 i)
{
union
{
uint32_t i;
uint8_t b[4];
} u = { .i = i };
for(size_t i = 0; i < 4; ++i)
heap_string_push(&ctx->instr, u.b[i]);
}
static int instruction_position(compiler_t *ctx)
{
return heap_string_size(&ctx->instr);
}
struct function* lookup_function_by_name(compiler_t *ctx, const char *name)
{
linked_list_reversed_foreach(ctx->functions, struct function*, it,
{
if(!strcmp(it->name, name))
return it;
});
return NULL;
}
static int primitive_data_type_size(int type)
{
switch(type)
{
case DT_CHAR: return 1;
case DT_SHORT: return 2;
case DT_INT: return 4;
case DT_LONG: return 4;
case DT_NUMBER: return 4;
case DT_FLOAT: return 4;
case DT_DOUBLE: return 4;
case DT_VOID: return 0;
}
debug_printf("unhandled type %d\n", type);
return 0;
}
static int data_type_size(compiler_t *ctx, struct ast_node *n)
{
switch(n->type)
{
case AST_STRUCT_DATA_TYPE:
{
int total = 0;
struct ast_node *ref = n->data_type_data.data_type;
assert(ref);
if(ref->type == AST_UNION_DECL)
{
for(int i = 0; i < ref->struct_decl_data.numfields; ++i)
{
int tmp = data_type_size(ctx, ref->struct_decl_data.fields[i]->variable_decl_data.data_type);
if(tmp > total)
total = tmp;
}
} else if(ref->type == AST_STRUCT_DECL)
{
for(int i = 0; i < ref->struct_decl_data.numfields; ++i)
total += data_type_size(ctx, ref->struct_decl_data.fields[i]->variable_decl_data.data_type);
} else
{
debug_printf( "unhandled struct data type node '%s', can't get size\n", AST_NODE_TYPE_to_string( ref->type ) );
}
return total;
} break;
case AST_IDENTIFIER:
{
struct variable* var = hash_map_find( ctx->function->variables, n->identifier_data.name );
assert( var );
return data_type_size(ctx, var->data_type_node);
}
break;
case AST_DATA_TYPE:
return data_type_size(ctx, n->data_type_data.data_type);
case AST_POINTER_DATA_TYPE:
return 4;
case AST_PRIMITIVE:
return primitive_data_type_size(n->primitive_data.primitive_type);
case AST_ARRAY_DATA_TYPE:
{
assert( n->data_type_data.array_size > 0 );
if ( n->data_type_data.data_type->type == AST_ARRAY_DATA_TYPE )
return data_type_size( ctx, n->data_type_data.data_type ) * n->data_type_data.array_size;
else if ( n->data_type_data.data_type->type == AST_PRIMITIVE )
{
//printf("array size = %d, primitive_type_size = %d\n", n->data_type_data.array_size, primitive_data_type_size( n->data_type_data.data_type->primitive_data_type_data.primitive_type ));
return primitive_data_type_size( n->data_type_data.data_type->primitive_data.primitive_type ) *
n->data_type_data.array_size;
}
else
{
perror("unhandled else for data_type_size\n");
return 0;
}
} break;
}
debug_printf( "unhandled data type node '%s', can't get size\n", AST_NODE_TYPE_to_string( n->type ) );
return 0;
}
static int data_type_pass_by_reference(struct ast_node *n)
{
if(n->type == AST_PRIMITIVE || n->type == AST_POINTER_DATA_TYPE)
return 0;
//for now pass everything else by reference, arrays etc
return 1;
}
static int process(compiler_t *ctx, struct ast_node *n);
typedef enum
{
FUNCTION_CALL_NOT_FOUND,
FUNCTION_CALL_IMPORT_NOT_FOUND,
FUNCTION_CALL_NORMAL,
FUNCTION_CALL_IMPORT,
FUNCTION_CALL_SYSCALL,
FUNCTION_CALL_INT3
} FUNCTION_CALL_TYPE;
static FUNCTION_CALL_TYPE identify_function_call_type(compiler_t* ctx, const char* function_name, /*avoid looking up the symbols multiple times when we don't have to */struct function **fn_out, struct dynlib_sym** sym_out)
{
if (!strcmp(function_name, "int3"))
return FUNCTION_CALL_INT3;
if (!strcmp(function_name, "syscall")
&&
(ctx->build_target == BT_OPCODES || ctx->build_target == BT_LINUX_X86 || ctx->build_target == BT_LINUX_X64)
)
return FUNCTION_CALL_SYSCALL;
struct function *fn = lookup_function_by_name(ctx, function_name);
if (fn)
{
*fn_out = fn;
if (fn->location != -1)
return FUNCTION_CALL_NORMAL;
struct dynlib_sym* sym = ctx->find_import_fn(ctx->find_import_fn_userptr, function_name);
if (sym)
{
*sym_out = sym;
return FUNCTION_CALL_IMPORT;
}
return FUNCTION_CALL_IMPORT_NOT_FOUND;
}
return FUNCTION_CALL_NOT_FOUND;
}
static int function_call_ident(compiler_t *ctx, const char *function_name, struct ast_node **args, int numargs)
{
struct function *fn;
struct dynlib_sym* sym;
int rvalue(compiler_t* ctx, reg_t reg, struct ast_node* n);
FUNCTION_CALL_TYPE function_call_type = identify_function_call_type(ctx, function_name, &fn, &sym);
switch (function_call_type)
{
default:
printf("invalid function call, got result %d\n", function_call_type);
cg->int3(ctx);
cg->int3(ctx);
cg->int3(ctx);
return 1;
break;
#if 0
case FUNCTION_CALL_IMPORT:
{
//TODO: FIXME atm highly specialized for memory/win32, see memory.c also assumes that location is n + 6
//TODO: FIXME make it work for building exe files aswell, e.g proper IAT thunk table
for (int i = 0; i < numargs; ++i)
{
process(ctx, args[numargs - i - 1]);
cg->push(ctx, EAX);
}
int from;
int nbytes = cg->indirect_call_imm32(ctx, 0x0, &from);
cg->jmp(ctx, nbytes);
//location P
//actual location of imported function
dd(ctx, 0x0);
if (numargs > 0)
{
//TODO: generalize
cg->add_imm8_to_r32(ctx, ESP, numargs * 4);
}
struct relocation reloc = {
.from = from,
.to = (intptr_t)sym,
.size = 4,
.type = RELOC_IMPORT
};
linked_list_prepend(ctx->relocations, reloc);
} break;
#endif
case FUNCTION_CALL_INT3:
//if (opt_flags & OPT_DEBUG)
cg->int3(ctx);
break;
case FUNCTION_CALL_NORMAL:
{
for (int i = 0; i < numargs; ++i)
{
process(ctx, args[numargs - i - 1]);
cg->push(ctx, EAX);
}
cg->call_imm32(ctx, fn->location);
if (numargs > 0)
{
//TODO: FIXME numargs > 0xff
cg->add_imm8_to_r32(ctx, ESP, numargs * 4);
}
} break;
case FUNCTION_CALL_SYSCALL:
cg->invoke_syscall(ctx, args, numargs);
break;
}
return 0;
}
static int function_variable_declaration_stack_size( compiler_t* ctx, struct ast_node* n )
{
assert( n->type == AST_FUNCTION_DECL );
int nd = n->func_decl_data.numdeclarations;
int total = 0;
for ( int i = 0; i < nd; ++i )
{
struct ast_node* decl = n->func_decl_data.declarations[i];
assert( decl->type == AST_VARIABLE_DECL );
int ds = data_type_size( ctx, decl->variable_decl_data.data_type );
assert( ds > 0 );
total += ds;
}
//align to 32
//TODO: fix this make sure the esp value is aligned instead
int aligned = total & ~31;
if(aligned == 0)
return 32;
return aligned;
}
#if 0
static int accumulate_local_variable_declaration_size(compiler_t *ctx, struct ast_node *n)
{
assert(n->type == AST_BLOCK_STMT);
int total = 0;
//TODO: fix this and make it change depending on variable type declaration instead of assignment
linked_list_reversed_foreach(n->block_stmt_data.body, struct ast_node**, it,
{
if((*it)->type == AST_VARIABLE_DECL)
{
int ds = data_type_size((*it)->variable_decl_data.data_type);
assert(ds > 0);
total += ds;
}
#if 0
if((*it)->type == AST_ASSIGNMENT_EXPR && (*it)->assignment_expr_data.operator == '=')
{
total += 4; //FIXME: shouldn't always be 4 bytes
}
#endif
});
return total;
/*
//align to 32
//TODO: fix this make sure the esp value is aligned instead
int aligned = total & ~31;
if(aligned == 0)
return 32;
return aligned;
*/
}
#endif
static intptr_t register_value(compiler_t *ctx, reg_t reg)
{
return ctx->registers[reg];
}
static struct ast_node *identifier_data_node(compiler_t *ctx, struct ast_node *n)
{
if(n->type != AST_IDENTIFIER)
debug_printf("expected identifier, got '%s'\n", AST_NODE_TYPE_to_string(n->type));
assert(n->type == AST_IDENTIFIER);
struct variable *var = hash_map_find(ctx->function->variables, n->identifier_data.name);
assert(var);
return var->data_type_node;
}
static int data_type_operand_size(compiler_t *ctx, struct ast_node *n, int ptr)
{
switch ( n->type )
{
// not a datatype, but we'll resolve it
case AST_IDENTIFIER:
return data_type_operand_size(ctx, identifier_data_node(ctx, n), ptr);
case AST_PRIMITIVE:
return primitive_data_type_size( n->primitive_data.primitive_type );
#ifndef MIN
#define MIN( a, b ) ( ( a ) > ( b ) ? ( b ) : ( a ) )
#endif
case AST_BIN_EXPR:
return MIN( data_type_operand_size(ctx, n->bin_expr_data.lhs, ptr), data_type_operand_size(ctx, n->bin_expr_data.rhs, ptr) );
case AST_LITERAL:
return 4;
case AST_POINTER_DATA_TYPE:
if ( ptr )
return 4;
if ( n->data_type_data.data_type->type == AST_POINTER_DATA_TYPE )
return data_type_operand_size( ctx, n->data_type_data.data_type, 1 );
else
return primitive_data_type_size(
n->data_type_data.data_type->primitive_data.primitive_type );
case AST_ARRAY_DATA_TYPE:
return primitive_data_type_size( n->data_type_data.data_type->primitive_data.primitive_type );
case AST_STRUCT_MEMBER_EXPR:
{
struct ast_node* idn = identifier_data_node(ctx, n->member_expr_data.object);
//ast_print_node_type("idn", idn);
assert(idn->type == AST_STRUCT_DATA_TYPE || idn->type == AST_POINTER_DATA_TYPE);
struct ast_node *sr = NULL;
if(idn->type == AST_POINTER_DATA_TYPE)
sr = idn->data_type_data.data_type->data_type_data.data_type;
else
sr = idn->data_type_data.data_type;
for (int i = 0; i < sr->struct_decl_data.numfields; ++i)
{
if (!strcmp(sr->struct_decl_data.fields[i]
->variable_decl_data.id->identifier_data.name,
n->member_expr_data.property->identifier_data.name))
{
return data_type_operand_size(
ctx,
sr->struct_decl_data.fields[i]->variable_decl_data.data_type,
ptr);
}
}
abort();
return 0;
} break;
case AST_MEMBER_EXPR:
{
assert(n->member_expr_data.object->type == AST_IDENTIFIER);
return data_type_operand_size(ctx, n->member_expr_data.object, 0);
} break;
case AST_WHILE_STMT:
return data_type_operand_size(ctx, n->while_stmt_data.test, ptr);
case AST_DO_WHILE_STMT:
return data_type_operand_size(ctx, n->do_while_stmt_data.test, ptr);
case AST_FOR_STMT:
return data_type_operand_size(ctx, n->for_stmt_data.test, ptr);
case AST_UNARY_EXPR:
if ( n->unary_expr_data.operator== '*' )
return data_type_operand_size( ctx, n->unary_expr_data.argument, 0 );
return data_type_operand_size(ctx, n->unary_expr_data.argument, ptr);
case AST_CAST:
return data_type_operand_size(ctx, n->cast_data.type, ptr);
case AST_DATA_TYPE:
return data_type_operand_size(ctx, n->data_type_data.data_type, ptr);
}
debug_printf( "unhandled data type '%s'\n", AST_NODE_TYPE_to_string( n->type ) );
return 0;
}
int rvalue(compiler_t *ctx, reg_t reg, struct ast_node *n);
int lvalue(compiler_t *ctx, reg_t reg, struct ast_node *n);
void store_operand(compiler_t *ctx, struct ast_node *n);
static void ast_handle_assignment_expression( compiler_t* ctx, struct ast_node* n )
{
cg->push(ctx, EBX);
struct ast_node* lhs = n->assignment_expr_data.lhs;
struct ast_node* rhs = n->assignment_expr_data.rhs;
rvalue( ctx, EAX, rhs );
// we should now have our result in eax
switch ( n->assignment_expr_data.operator)
{
case TK_PLUS_ASSIGN:
{
cg->push( ctx, EAX );
lvalue( ctx, EBX, lhs );
// load_variable(ctx, EBX, 1, lhs, 0);
cg->pop( ctx, EAX );
cg->load_reg(ctx, EAX, EBX);
cg->add(ctx, EBX, EAX);
cg->store_reg(ctx, EBX, EAX);
}
break;
case TK_MINUS_ASSIGN:
{
cg->push( ctx, EAX );
lvalue( ctx, EBX, lhs );
// load_variable(ctx, EBX, 1, lhs, 0);
cg->pop( ctx, EAX );
cg->load_reg(ctx, EAX, EBX);
cg->sub(ctx, EBX, EAX);
cg->store_reg(ctx, EBX, EAX);
}
break;
// TODO: add mul and other operators
case TK_MOD_ASSIGN:
{
cg->mov(ctx, ESI, EAX);
// TODO: maybe push esi, incase we trash the register
rvalue( ctx, EAX, lhs );
cg->xor(ctx, EDX, EDX);
cg->idiv(ctx, ESI);
cg->push( ctx, EDX );
lvalue( ctx, EBX, lhs );
cg->pop( ctx, EDX );
cg->store_reg(ctx, EBX, EDX);
}
break;
case TK_DIVIDE_ASSIGN:
{
cg->mov(ctx, ESI, EAX);
// TODO: maybe push esi, incase we trash the register
rvalue( ctx, EAX, lhs );
cg->xor(ctx, EDX, EDX);
cg->idiv(ctx, ESI);
cg->push( ctx, EAX );
lvalue( ctx, EBX, lhs );
cg->pop( ctx, EAX );
cg->store_reg(ctx, EBX, EAX);
}
break;
case TK_MULTIPLY_ASSIGN:
{
cg->mov(ctx, ESI, EAX);
// TODO: maybe push esi, incase we trash the register
rvalue( ctx, EAX, lhs );
cg->xor(ctx, EDX, EDX);
cg->imul(ctx, ESI);
cg->push( ctx, EAX );
lvalue( ctx, EBX, lhs );
cg->pop( ctx, EAX );
cg->store_reg(ctx, EBX, EAX);
}
break;
case '=':
{
int os = data_type_operand_size( ctx, lhs, 1 );
cg->push( ctx, EAX );
lvalue( ctx, EBX, lhs );
cg->pop( ctx, EAX );
store_operand( ctx, lhs );
}
break;
default:
printf( "unhandled assignment operator\n" );
break;
}
cg->pop(ctx, EBX);
}
void store_operand(compiler_t *ctx, struct ast_node *n)
{
int os = data_type_operand_size( ctx, n, 1 );
// TODO: fix hardcoded EBX
switch ( os )
{
case 4:
cg->store_reg(ctx, EBX, EAX);
break;
case 2:
// mov word ptr [ebx], ax
db( ctx, 0x66 );
db( ctx, 0x89 );
db( ctx, 0x03 );
break;
case 1:
// mov byte ptr [ebx], al
db( ctx, 0x88 );
db( ctx, 0x03 );
break;
default:
//TODO: FIXME throw a proper error
//ran into issue with
//void *buffer = malloc(n);
//where buffer[offset] = 0;
//resulted in a error with operand size of 0
//because void operand size is 0
//and the above doesn't make sense
//preferably with a node token / source line file debug information
debug_printf( "unhandled operand size %d for node '%s'\n", os, AST_NODE_TYPE_to_string(n->type));
exit( 1 );
break;
}
}
static int load_operand(compiler_t *ctx, struct ast_node *n)
{
int os = data_type_operand_size( ctx, n, 0 );
switch ( os )
{
case 4:
cg->load_reg(ctx, EAX, EBX);
break;
case 2:
// movzx eax, word [ebx]
db( ctx, 0x0f );
db( ctx, 0xb7 );
db( ctx, 0x03 );
break;
case 1:
// movzx eax, byte [ebx]
db( ctx, 0x0f );
db( ctx, 0xb6 );
db( ctx, 0x03 );
break;
default:
debug_printf( "unhandled regsz '%d' for load_operand \n", os );
exit( 1 );
break;
}
return os;
}
int rvalue(compiler_t *ctx, reg_t reg, struct ast_node *n)
{
//printf("rvalue node '%s'\n", AST_NODE_TYPE_to_string(n->type));
switch(n->type)
{
case AST_LITERAL:
switch ( n->literal_data.type )
{
case LITERAL_INTEGER:
cg->mov_r_imm32(ctx, reg, n->literal_data.integer, NULL);
break;
case LITERAL_STRING:
{
cg->mov_r_string(ctx, reg, n->literal_data.string);
}
break;
default:
perror( "unhandled literal" );
break;
}
break;
case AST_IDENTIFIER:
{
// TODO: remove this and move to lvalue, then rvalue will call lvalue then load the identifier into EAX
const char* variable_name = n->identifier_data.name;
struct variable* var = hash_map_find( ctx->function->variables, variable_name );
if(!var)
printf("var '%s' does not exist\n", variable_name);
assert( var );
int offset = var->is_param ? 4 + var->offset : 0xff - var->offset + 1;
switch(var->data_type_node->type)
{
case AST_ARRAY_DATA_TYPE:
// lea r32,[ebp - offset]
//db(ctx, 0x8d);
//db(ctx, 0x85 + 8 * reg);
//dd(ctx, offset);
//basically same as lea, except with more steps
cg->mov(ctx, reg, EBP);
cg->sub_regn_imm32(ctx, reg, offset);
break;
default:
{
int nbytes = data_type_operand_size( ctx, n, 1 );
switch(nbytes)
{
case 4:
cg->load_regn_base_offset_imm32(ctx, reg, offset);
break;
case 2:
case 1:
cg->push(ctx,EBX);
lvalue(ctx,EBX,n);
load_operand(ctx, n);
cg->pop(ctx,EBX);
break;
default:
perror("unhandled case for loading identifier rvalue");
break;
}
}
break;
}
}
break;
case AST_TERNARY_EXPR:
{
struct ast_node *consequent = n->ternary_expr_data.consequent;
struct ast_node *condition = n->ternary_expr_data.condition;
struct ast_node *alternative = n->ternary_expr_data.alternative;
process(ctx, condition);
cg->test(ctx, EAX, EAX);
// jz rel32
int jz_pos = instruction_position( ctx ); // jmp_pos + 2 = new_pos
db( ctx, 0x0f );
db( ctx, 0x84 );
dd( ctx, 0x0 ); // placeholder
process(ctx, consequent);
int jmp_pos = instruction_position( ctx );
db( ctx, 0xe9 );
dd( ctx, 0x0 ); // placeholder
set32( ctx, jz_pos + 2, instruction_position( ctx ) - jz_pos - 6 );
process(ctx, alternative);
set32( ctx, jmp_pos + 1, instruction_position( ctx ) - jmp_pos - 5 );
} break;
case AST_BIN_EXPR:
{
struct ast_node *lhs = n->bin_expr_data.lhs;
struct ast_node *rhs = n->bin_expr_data.rhs;
rvalue(ctx, EAX, lhs);
cg->push( ctx, EAX );
rvalue( ctx, EAX, rhs );
cg->mov(ctx, ECX, EAX);
cg->pop( ctx, EAX );
cg->xor(ctx, EDX, EDX);
reljmp_t rel;
switch(n->bin_expr_data.operator)
{
case '*':
cg->imul(ctx, ECX);
break;
case '/':
cg->idiv(ctx, ECX);
break;
case '+':
cg->add(ctx, EAX, ECX);
break;
case '-':
cg->sub(ctx, EAX, ECX);
break;
case '&':
cg->and(ctx, EAX, ECX);
break;
case '|':
cg->or(ctx, EAX, ECX);
break;
case '^':
cg->xor(ctx, EAX, ECX);
break;
case TK_LSHIFT:
db(ctx, 0xd3);
db(ctx, 0xf0);
break;
case TK_RSHIFT:
db(ctx, 0xd3);
db(ctx, 0xf8);
break;
case '%':
//idiv(ctx, ECX);
//mov(ctx, EAX, EDX);
//TODO: FIXME other architectures won't neccessarily put the remainder into EDX
//do this for other cases aswell and TODO generalize more e.g mov(ctx, REG0, add(REG1, REG2))
//mod returns the register that the remainder is placed into
//then when doing mov with same register, don't emit any extra opcodes
//for now just pass the default registers that x86 expects
//TODO: FIXME what if the result is seperated over 2 registers e.g EAX:EDX, register structure with flags which one is enabled? for now just use 1
//mov(ctx, EAX, mod(ctx, EAX, ECX));
cg->mod(ctx, EAX, ECX);
break;
case TK_LEQUAL:
cg->cmp(ctx, EAX, ECX);
cg->xor(ctx, EAX, EAX);
cg->jmp_begin(ctx, &rel, RJ_JG);
cg->inc(ctx, EAX);
cg->jmp_end(ctx, &rel);
break;
case '>':
cg->cmp(ctx, EAX, ECX);
cg->xor(ctx, EAX, EAX);
cg->jmp_begin(ctx, &rel, RJ_JLE);
cg->inc(ctx, EAX);
cg->jmp_end(ctx, &rel);
break;
case '<':
cg->cmp(ctx, EAX, ECX);
cg->xor(ctx, EAX, EAX);
cg->jmp_begin(ctx, &rel, RJ_JGE);
cg->inc(ctx, EAX);
cg->jmp_end(ctx, &rel);
break;
case TK_EQUAL:
cg->cmp(ctx, EAX, ECX);
cg->xor(ctx, EAX, EAX);
cg->jmp_begin(ctx, &rel, RJ_JNE);
cg->inc(ctx, EAX);
cg->jmp_end(ctx, &rel);
break;
case TK_NOT_EQUAL:
cg->cmp(ctx, EAX, ECX);
cg->xor(ctx, EAX, EAX);
cg->jmp_begin(ctx, &rel, RJ_JE);
cg->inc(ctx, EAX);
cg->jmp_end(ctx, &rel);
break;
case TK_GEQUAL:
cg->cmp(ctx, EAX, ECX);
cg->xor(ctx, EAX, EAX);
cg->jmp_begin(ctx, &rel, RJ_JL);
cg->inc(ctx, EAX);
cg->jmp_end(ctx, &rel);
break;
default:
printf("unhandled operator (%d) %c\n", n->bin_expr_data.operator, n->bin_expr_data.operator);
break;
}
} break;
case AST_ASSIGNMENT_EXPR:
{
ast_handle_assignment_expression(ctx, n);
} break;
case AST_SIZEOF:
{
int sz = 0;
switch(n->sizeof_data.subject->type)
{
case AST_PRIMITIVE:
case AST_POINTER_DATA_TYPE:
case AST_ARRAY_DATA_TYPE:
case AST_STRUCT_DATA_TYPE:
sz = data_type_size( ctx, n->sizeof_data.subject );
break;
case AST_DATA_TYPE:
sz = data_type_size(ctx,n->data_type_data.data_type);
break;
case AST_IDENTIFIER:
{
struct variable *var = hash_map_find(ctx->function->variables, n->sizeof_data.subject->identifier_data.name);
assert( var );
sz = data_type_size( ctx, var->data_type_node );
}
break;
default:
debug_printf("unhandled sizeof '%s'\n", AST_NODE_TYPE_to_string(n->sizeof_data.subject->type));
break;
}
assert(sz>0);
cg->mov_r_imm32(ctx, EAX, sz, NULL);
} break;
case AST_STRUCT_MEMBER_EXPR:
{
cg->push(ctx, EBX);
struct ast_node *object = n->member_expr_data.object;
struct ast_node *dn = identifier_data_node(ctx, object);
//ast_print_node_type("object", dn);
if ( dn->type == AST_POINTER_DATA_TYPE )
{
rvalue( ctx, EAX, object );
cg->mov(ctx, EBX, EAX);
}
else
lvalue( ctx, EBX, object );
struct ast_node* sr = NULL;
if (dn->type == AST_POINTER_DATA_TYPE)
sr = dn->data_type_data.data_type->data_type_data.data_type;
else
sr = dn->data_type_data.data_type;
assert(n->member_expr_data.property->type == AST_IDENTIFIER);
int off, sz;
struct ast_node *field = get_struct_member_info(ctx, &sr->struct_decl_data, n->member_expr_data.property->identifier_data.name, &off,
&sz);
assert(sz > 0);
cg->add_imm32_to_r32(ctx, EBX, off);
load_operand(ctx, field->variable_decl_data.data_type);
cg->pop(ctx, EBX);
} break;
case AST_MEMBER_EXPR:
{
cg->push(ctx, EBX);
struct ast_node *object = n->member_expr_data.object;
struct ast_node *property = n->member_expr_data.property;
struct ast_node *dn = identifier_data_node(ctx, object);
//ast_print_node_type("object", dn);
if ( dn->type == AST_POINTER_DATA_TYPE )
{
rvalue( ctx, EAX, object );
cg->mov(ctx, EBX, EAX);
}
else
lvalue( ctx, EBX, object );
rvalue( ctx, reg, n->member_expr_data.property );
int os = data_type_operand_size( ctx, object, 0 );
cg->push( ctx, ESI );
cg->mov_r_imm32(ctx, ESI, os, NULL);
cg->imul(ctx, ESI);
cg->pop( ctx, ESI );
cg->add( ctx, EBX, reg );
load_operand(ctx, dn);
cg->pop(ctx, EBX);
} break;
case AST_UNARY_EXPR:
{
struct ast_node *arg = n->unary_expr_data.argument;
if(arg->type == AST_LITERAL)
{
switch(n->unary_expr_data.operator)
{
case '-':
cg->mov_r_imm32(ctx, EAX, -arg->literal_data.integer, NULL);
break;
case '+':
cg->mov_r_imm32(ctx, EAX, arg->literal_data.integer, NULL);
break;
case '!':
cg->mov_r_imm32(ctx, EAX, !arg->literal_data.integer, NULL);
break;
case '~':
cg->mov_r_imm32(ctx, EAX, ~arg->literal_data.integer, NULL);
break;
default:
printf("unhandled unary expression %c\n", n->unary_expr_data.operator);
break;
}
} else
{
switch(n->unary_expr_data.operator)
{
case '*':
{
// TODO: FIXME hack, checking whether next node is ++, to prevent using tmp memory somewhere or use
// the lea edx, [eax + increment] trick
struct ast_node* arg = n->unary_expr_data.argument;
if ( arg->type == AST_UNARY_EXPR )
{
switch ( arg->unary_expr_data.operator)
{
case TK_PLUS_PLUS:
{
struct ast_node* pparg = arg->unary_expr_data.argument;
assert(!arg->unary_expr_data.prefix);
cg->push( ctx, EBX );
// let's assume pparg is a identifier of type const char *
lvalue( ctx, EBX, pparg );
//save our ptr to our variable to edx
cg->push(ctx, EDX);
cg->mov(ctx, EDX, EBX);
//load the actual char * pointer e.g "test" into ebx
cg->load_reg(ctx, EBX, EBX);
//then load our value from ebx (can be a char, int or any type, in this case char 8 bits)
int os = load_operand( ctx, pparg ); //loads location in EBX into EAX register
//printf("os = %d\n", os);
//increment the actual pointer value of our string
//basically inc [edx]
cg->push(ctx, EAX);
cg->load_reg(ctx, EAX, EDX);
cg->inc(ctx, EAX);
cg->store_reg(ctx, EDX, EAX);
cg->pop(ctx, EAX);
//restore our EDX value if we ever used it for anything else.
cg->pop(ctx, EDX);
cg->pop( ctx, EBX );
}
break;
default:
debug_printf( "unhandled operator after dereference\n" );
return 1;
}
}
else
{
cg->push( ctx, EBX );
rvalue( ctx, reg, n->unary_expr_data.argument );
cg->mov(ctx, EBX, EAX);
load_operand( ctx, n->unary_expr_data.argument );
cg->pop( ctx, EBX );
}
} break;
case TK_PLUS_PLUS:
// handle generic ++ case
cg->push( ctx, EBX );
lvalue( ctx, EBX, n->unary_expr_data.argument );
if(!n->unary_expr_data.prefix)