diff options
| -rw-r--r-- | compiler.c | 80 |
1 files changed, 77 insertions, 3 deletions
@@ -663,6 +663,9 @@ int _var_ptr_type(Variable *v) { return ((int*)v->ptr_chain.data)[v->ptr_chain.count - 1]; } +// Valid registers to use in operations: +// rax (1), rdx (4), rsi (5), rdi (6). Other registers assumed to be used by +// variables char *_op_get_register(int reg, int size) { Vector out = vect_init(sizeof(char)); char add = 'r'; @@ -718,15 +721,86 @@ char *_op_get_location(Variable *var, int location) { } } +int _var_size(Variable *var) { + size_t count = var->ptr_chain.count; + int *ptype = vect_get(&var->ptr_chain, count - 1); + + while(count > 0 && *ptype == PTYPE_REF) { + ptype = vect_get(&var->ptr_chain, --count); + } + + if(count > 0) { + return 8; + } + + return var->type->size; +} + +int _var_pure_size(Variable *var) { + if ( var->ptr_chain.count > 0 ) { + return 8; + } + + return var->type->size; +} + void var_swap_register(CompData *out, Variable *swap, int new_reg) { if(swap->location == new_reg) return; + } -void var_op_dereference(CompData *out, Variable *store, Variable *from) {} -void var_op_index(CompData *out, Variable *store, Variable *from, Variable *index) {} +// Dereference a pointer variable into a new variable "store". +// Store is copied from "from" variable, so it should be empty (will not be freed). +void var_op_dereference(CompData *out, Variable *store, Variable *from) { + *store = var_copy(from); + if(from->ptr_chain.count < 1) { + printf("WARNING: var_op_dereference called on variable which is not a pointer type!"); + return; + } + + // Generate initial move (from -> rsi) + vect_push_string(&out->text, "\tmov rsi, "); + char *addr; + + if(from->location < 1) { + // It's from an address on stack or in data section + if(from->location < 0) { + addr = _gen_address("qword ", "rsp", "", 0, from->location); + } else { + addr = _gen_address("qword ", from->name, "", 0, 0); + } + } else { + // It's from a register + addr = _op_get_register(from->location, 8); + } + + vect_push_string(&out->text, addr); + free(addr); + vect_push_string(&out->text, "; Move for dereference\n"); + + // Keep de-referencing until we reach the pointer (or ptr_chain bottoms out). + int *current = vect_get(&store->ptr_chain, store->ptr_chain.count - 1); + while(*current == PTYPE_REF && store->ptr_chain.count > 1) { + vect_push_string(&out->text, "\tmov rsi, [rsi] ; Dereference\n"); + vect_pop(&store->ptr_chain); + } + + // pointer type -> ref + int ref = PTYPE_REF; + current = vect_get(&store->ptr_chain, store->ptr_chain.count - 1); + *current = ref; + // Location -> rsi (5) + store->location = 5; +} + +// Index into an array by "index" elements. Store the reference to the value in "store". +// The "store" variable should be freed or empty before calling this function. +void var_op_index(CompData *out, Variable *store, Variable *from, Variable *index) { + +} void var_op_set(CompData *out, Variable *store, Variable *from) {} @@ -747,7 +821,7 @@ void var_op_reference(CompData *out, Variable *store, Variable *from) { } Variable var_op_member(Variable *from, char *member) { - Variable out; + Variable out = var_copy(from); return out; } |