diff options
| -rw-r--r-- | compiler.c | 56 |
1 files changed, 50 insertions, 6 deletions
@@ -705,16 +705,23 @@ char *_op_get_location(Variable *var) { return out; } +// Can only be used on variables contained in a register. void var_swap_register(CompData *out, Variable *swap, int new_reg) { - if(swap->location == new_reg) + if(swap->location == new_reg || swap->location < 1) return; - - - + vect_push_string(&out->text, "\tmov "); + vect_push_free_string(&out->text, _op_get_register(new_reg, _var_pure_size(swap))); + vect_push_string(&out->text, ", "); + vect_push_free_string(&out->text, _op_get_register(swap->location, _var_pure_size(swap))); + vect_push_string(&out->text, " ; Register swap\n\n"); + swap->location = new_reg; } // Dereference a pointer variable into a new variable "store". // Store is copied from "from" variable, so it should be empty (will not be freed). +// In other words, it takes a pointer variable and turns it into a reference, +// which can be used in other var operations like member variables, struct moving, +// or value setting. void var_op_dereference(CompData *out, Variable *store, Variable *from) { *store = var_copy(from); if(from->ptr_chain.count < 1 || _var_ptr_type(from) != PTYPE_REF) { @@ -751,7 +758,11 @@ void var_op_index(CompData *out, Variable *store, Variable *from, Variable *inde } -void var_op_set(CompData *out, Variable *store, Variable *from) { +// Pure set simply copies data from one source to another, disregarding +// pointer arithmatic. Should not be used to set the value of data reference variables +// point to, but can be used to directly set the location that reference +// variables point to for things like function parameter passing. +void var_op_pure_set(CompData *out, Variable *store, Variable *from) { if (_var_pure_size(from) != _var_pure_size(store)) { printf("ERROR: Can't set one variable to the other as their pure sizes are different!\n"); } @@ -797,10 +808,19 @@ void var_op_set(CompData *out, Variable *store, Variable *from) { } } +// Tries it's best to coerce the data from "from" into a format +// which will be accepted by "store", following refences in the process. +// This is similar to a normal move operation. +void var_op_set(CompData *out, Variable *store, Variable *from) { + +} + +// Take a variable on the stack or in data section, and load a reference +// to it's location in memory void var_op_reference(CompData *out, Variable *store, Variable *from) { if(from->ptr_chain.count > 0 && _var_ptr_type(from) == PTYPE_REF) { // The value is a reference to data, so we should just copy it - var_op_set(out, store, from); + var_op_pure_set(out, store, from); return; } @@ -810,7 +830,31 @@ void var_op_reference(CompData *out, Variable *store, Variable *from) { return; } + vect_push_string(&out->text, "\tlea "); + if(store->location < 1) { + // Store is on stack or in data sec, so we need to + // copy into a tmp register first (we use rsi by convention) + vect_push_free_string(&out->text, _op_get_register(5, _var_pure_size(store))); + } else { + // Since store is in a register we can directly lea + vect_push_free_string(&out->text, _op_get_register(store->location, _var_pure_size(store))); + } + + vect_push_string(&out->text, ", "); + vect_push_free_string(&out->text, _op_get_location(from)); + vect_push_string(&out->text, " ; Generate reference\n"); + + if(store->location < 1) { + // If we stored in a tmp register, we need to complete + // the move + vect_push_string(&out->text, "\tmov "); + vect_push_free_string(&out->text, _op_get_location(store)); + vect_push_string(&out->text, ", "); + vect_push_free_string(&out->text, _op_get_register(5, _var_pure_size(store))); + vect_push_string(&out->text, " ; Move ref from tmp register to final location\n"); + } + vect_push_string(&out->text, "\n"); } Variable var_op_member(Variable *from, char *member) { |