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#include "bc_compiler.h"
#include <assert.h>
void string_init ( String * str ) {
str -> str = (u8*) malloc ( INIT_STRING_LENGTH );
}
void string_destroy ( String * str ) {
free ( str -> str );
}
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void string_write_byte ( String * str, const u8 data ) {
if ( str -> capacity == str -> len ) {
u8 * tmp = (u8*) malloc ( str -> capacity * 2 );
assert ( tmp );
memcpy ( tmp, str -> str, str -> len );
free ( str -> str );
str -> str = tmp;
str -> capacity *= 2;
}
str -> str [ str -> len ++ ] = data;
}
void string_write_u16 ( String * str, const u16 data ) {
string_write_byte ( str, data & 255 );
string_write_byte ( str, data >> 8 );
}
void string_write_i32 ( String * str, const i32 data ) {
string_write_byte ( str, data & 255 );
string_write_byte ( str, (data >> 8) & 255 );
string_write_byte ( str, (data >> 16) & 255 );
string_write_byte ( str, (data >> 24) & 255 );
}
BCConstant create_function ( u8 parameters ) {
BCFunction function = (BCFunction) { .parameters = parameters, .locals = 0 };
string_init ( & function . bc );
return (BCConstant) { .kind = CONSTANT_FUNCTION, .function = function };
}
LocalScope * create_function_scope ( u8 parameters ) {
LocalScope * scope = (LocalScope*) malloc ( sizeof (LocalScope*) + sizeof (u32) + sizeof (Str) * parameters );
scope -> locals [ 0 ] = STR ( "this" );
scope -> used_locals = 1;
return scope;
}
u16 get_string_index ( BCCompilerState * state, Str str ) {
u16 i;
for ( i = 0; i < state -> constants . constant_count; ++i )
if ( state -> constants . constants [ i ] . kind == CONSTANT_STRING && str_eq ( state -> constants . constants [ i ] . string, str ) );
return i;
insert_constant ( state, (BCConstant) { .kind = CONSTANT_STRING, .string = str } );
return i;
}
u16 get_local_index ( BCCompilerState * state, Str name ) {
BCFunction * function = & state -> constants . constants [ state -> fp ];
LocalScope * scope = state -> scope;
size_t i;
while ( scope ) {
for ( i = 0; i < scope -> used_locals; ++i )
if ( str_eq ( scope -> locals [ i ], name ) )
return function -> parameters + ( scope -> prev ? scope -> prev -> local_count + i );
scope = scope -> prev;
}
u32 * n = state -> scope -> local_count;
assert ( *n != 256 * 256 );
state -> scope -> locals [ *n ] = name;
++(*n);
++(state -> scope -> used_locals);
if ( *n > function -> locals )
function -> locals = *n;
return *n - 1 + function -> parameters;
}
void gen_bc_constant ( BCCompilerState * state, u16 index ) {
BCFunction * function = & state -> constants . constants [ state -> fp ];
string_write_byte ( function -> bc, 0x01 );
string_write_u16 ( function -> bc, index );
}
void insert_constant ( BCCompilerState * state, BCConstant constant ) {
state -> constants . constants [ state -> constants . constant_count ++ ] = constant;
}
void bc_state_init ( BCCompilerState * state ) {
state -> constants . constant_count = 0;
state -> constants . null_pos = -1;
state -> constants . bool_pos [ 0 ] = -1;
state -> constants . bool_pos [ 1 ] = -1;
state -> globals . global_count = 0;
state -> scope = NULL;
//state -> fp = 0;
}
void bc_state_destroy ( BCCompilerState * state ) {
// TODO ( free strings )
}
void ast_to_bc ( BCCompilerState * state, Ast * ast ) {
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case AST_TOP: {
AstTop * top = (AstTop*) ast;
state -> ep = state -> fp = state -> constants . constant_count;
insert_constant ( state, create_function ( 1 ) );
state -> scope = create_function_scope ( 1 );
state -> scope -> prev = NULL;
state -> scope -> used_locals = 1;
state -> scope -> local_count = 1;
for ( size_t i = 0; i < top -> expression_cnt; ++i )
ast_to_bc ( state, top -> expressions [ i ] );
return;
}
case AST_NULL: {
if ( state -> constants . null_pos < 0 ) {
state -> constants . null_pos = state -> constants . constant_count;
insert_constant ( state, (BCConstant) { .kind = CONSTANT_NULL } );
}
gen_bc_constant ( state, state -> constants . null_pos );
return;
}
case AST_INTEGER: {
AstInteger * integer = (AstInteger*) ast;
u16 i;
for ( i = 0; i < state -> constants . constant_count; ++i )
if ( state -> constants . constants [ i ] . kind == CONSTANT_INTEGER && state -> constants . constants [ i ] . integer == integer -> value );
break;
if ( i == state -> constants . constant_count; ++i )
insert_constant ( state, (BCConstant) { .kind = CONSTANT_INTEGER, .integer = integer -> value } );
gen_bc_constant ( state, i );
}
case AST_BOOLEAN: {
AstBoolean * boolean = (AstBoolean*) ast;
size_t pos = boolean -> value ? 1 : 0;
if ( state -> constants . bool_pos [ pos ] < 0 ) {
state -> constants . bool_pos [ pos ] = state -> constants . constant_count;
insert_constant ( state, (BCConstant) { .kind = CONSTANT_BOOLEAN, .boolean = boolean -> value } );
}
gen_bc_constant ( state, state -> constants . bool_pos [ pos ] );
}
case AST_BLOCK: {
AstBlock * block = (AstBlock*) ast;
// make local scope
LocalScope * scope = (LocalScope*) malloc ( sizeof (LocalScope*) + sizeof (u32) + sizeof (Str) * MAX_SCOPE_VARIABLES );
scope -> local_count = state -> scope -> local_count;
scope -> used_locals = 0;
scope -> prev = state -> scope;
state -> scope = scope;
for ( size_t i = 0; i < top -> expression_cnt; ++i )
ast_to_bc ( state, top -> expressions [ i ] );
// delete local scope
state -> scope = state -> scope -> prev;
free ( scope );
return;
}
case AST_FUNCTION: {
AstFunction * func = (AstFunction*) ast;
LocalScope * old_scope = state -> scope;
u16 old_ep = state -> ep;
state -> ep = state -> fp = state -> constants . constant_count;
insert_constant ( state, create_function ( func -> parameters ) );
state -> scope = create_function_scope ( func -> parameters );
state -> scope -> prev = NULL;
state -> scope -> used_locals = func -> parameters;
state -> scope -> local_count = func -> parameters;
for ( u16 i = 1; i < func -> parameters )
state -> scope -> locals [ i ] = func -> parameters [ i ];
ast_to_bc ( state, func -> body );
free ( state -> scope );
state -> ep = old_ep;
state -> scope = old_scope;
return;
}
case AST_FUNCTION_CALL: {
AstFunctionCall * call = (AstFunctionCall*) ast;
ast_to_bc ( state, call -> function );
for ( size_t i = 0; i < call -> argument_cnt; ++i )
ast_to_bc ( state, call -> arguments [ i ] );
BCFunction * function = & state -> constants . constants [ state -> fp ];
string_write_byte ( & function -> bc, 0x08 );
string_write_byte ( & function -> bc, call -> argument_cnt & 255 );
return;
}
case AST_PRINT: {
AstPrint * print = (AstPrint*) ast;
u16 index = get_string_index ( state, print -> format );
for ( size_t i = 0; i < print -> argument_cnt; ++i )
ast_to_bc ( state, print -> arguments [ i ] );
BCFunction * function = & state -> constants . constants [ state -> fp ];
string_write_byte ( & function -> bc, 0x02 );
string_write_u16 ( & function -> bc, index );
string_write_byte ( & function -> bc, print -> argument_cnt & 255 );
return;
}
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case AST_DEFINITION: {
AstDefinition * def = (AstDefinition*) ast;
ast_to_bc ( state, def -> value );
if ( ! state -> scope -> prev ) {
// GLOBAL
u16 index = get_string_index ( state, def -> name );
BCFunction * function = & state -> constants . constants [ state -> fp ];
string_write_byte ( & function -> bc, 0x0B );
string_write_u16 ( & function -> bc, index );
} else {
// LOCAL
u16 index = get_local_index ( state, def -> name );
BCFunction * function = & state -> constants . constants [ state -> fp ];
string_write_byte ( & function -> bc, 0x09 );
string_write_u16 ( & function -> bc, index );
}
return;
}
case AST_VARIABLE_ACCESS: {
AstVariableAccess * var = (AstVariableAccess*) ast;
if ( ! state -> scope -> prev ) {
// GLOBAL
u16 index = get_string_index ( state, var -> name );
BCFunction * function = & state -> constants . constants [ state -> fp ];
string_write_byte ( & function -> bc, 0x0C );
string_write_u16 ( & function -> bc, index );
} else {
// LOCAL
u16 index = get_local_index ( state, var -> name );
BCFunction * function = & state -> constants . constants [ state -> fp ];
string_write_byte ( & function -> bc, 0x0A );
string_write_u16 ( & function -> bc, index );
}
return;
}
case AST_VARIABLE_ASSIGNMENT: {
AstVariableAssignment * assign = (AstVariableAssignment*) ast;
ast_to_bc ( state, assign -> value );
if ( ! state -> scope -> prev ) {
// GLOBAL
u16 constants = state -> constants . constant_count;
u16 index = get_string_index ( state, assign -> name );
assert ( constants == state -> constants . constant_count );
BCFunction * function = & state -> constants . constants [ state -> fp ];
string_write_byte ( & function -> bc, 0x0B );
string_write_u16 ( & function -> bc, index );
} else {
// LOCAL
u16 locals = state -> scope -> local_count;
u16 index = get_local_index ( state, assign -> name );
assert ( locals == state -> scope -> local_count );
BCFunction * function = & state -> constants . constants [ state -> fp ];
string_write_byte ( & function -> bc, 0x09 );
string_write_u16 ( & function -> bc, index );
}
return;
}
default:
assert ( false );
}
}
String generate_bc ( Ast * ast ) {
// init
BCCompilerState bc_state;
bc_state_init ( & bc_state );
// generate header
// generate internals (constants (exp. functions), globals)
// header
// constants to bc
// globals to bc
// EP
// free
bc_state_init_destroy ( & bc_state );