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make JNZ JZ (if was backwards, and this is more convient right now

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Nathan Braswell
2018-02-27 21:41:57 -05:00
parent dad97a25a5
commit 8a22263b1d
1 changed files with 14 additions and 14 deletions
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28
stdlib/bytecode_generator.krak
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@@ -79,7 +79,7 @@ adt byte_inst {
ldr: ldr,
str: str,
jmp: jmp,
jnz: jnz,
jz: jz,
call,
ret
}
@@ -105,7 +105,7 @@ obj str {
obj jmp {
var offset: int
}
obj jnz {
obj jz {
var reg: int
var offset: int
}
@@ -118,7 +118,7 @@ fun to_string(b: byte_inst): string {
byte_inst::ldr(l) return string("r") + l.to_reg + " = ldr r" + l.from_reg + " (" + l.offset + ")"
byte_inst::str(s) return string("str(r") + s.to_reg + "(" + s.offset + ") <= r" + s.from_reg + ")"
byte_inst::jmp(j) return string("jmp(pc += ") + j.offset + ")"
byte_inst::jnz(j) return string("jmp(r") + j.reg + " != 0, pc += " + j.offset + ")"
byte_inst::jz(j) return string("jmp(r") + j.reg + " == 0, pc += " + j.offset + ")"
byte_inst::call() return string("call")
byte_inst::ret() return string("ret")
}
@@ -172,7 +172,7 @@ obj bytecode_function (Object) {
var res = name + "(frame size " + frame_size + "):\n"
res += "\t frame layout\n"
var_to_frame_offset.for_each(fun(n: *ast_node, o: int) {
res += "\t\t" + n->identifier.name + ": r0 + " + o
res += "\t\t" + n->identifier.name + ": r0 + " + o + "\n"
})
res += "\n\t bytecode\n"
var pc = 0
@@ -267,7 +267,7 @@ obj bytecode_generator (Object) {
functions.add(bytecode_function(get_name(node)))
node->function.parameters.for_each(fun(p: *ast_node) {
functions.last().var_to_frame_offset[p] = functions.last().frame_size
functions.last().frame_size += type_size(p->identifier.type)
functions.last().frame_size += type_size(p->identifier.type) / 4
})
generate(node->function.body_statement)
return -1
@@ -276,7 +276,7 @@ obj bytecode_generator (Object) {
var identifier = node->declaration_statement.identifier
var ident_type = identifier->identifier.type
functions.last().var_to_frame_offset[identifier] = functions.last().frame_size
functions.last().frame_size += type_size(ident_type)
functions.last().frame_size += type_size(ident_type) / 4
if (node->declaration_statement.expression) {
emit_str(0, functions.last().var_to_frame_offset[identifier], generate(node->declaration_statement.expression))
}
@@ -290,17 +290,17 @@ obj bytecode_generator (Object) {
}
fun generate_if_statement(node: *ast_node): int {
var cond_reg = generate(node->if_statement.condition)
var jnz_index = functions.last().instructions.size
emit_jnz(cond_reg,0)
var jz_index = functions.last().instructions.size
emit_jz(cond_reg,0)
generate(node->if_statement.then_part)
if (node->if_statement.else_part) {
var jmp_index = functions.last().instructions.size
emit_jmp(0)
functions.last().instructions[jnz_index].jnz.offset = functions.last().instructions.size - jnz_index
functions.last().instructions[jz_index].jz.offset = functions.last().instructions.size - jz_index
generate(node->if_statement.else_part)
functions.last().instructions[jmp_index].jmp.offset = functions.last().instructions.size - jmp_index
} else {
functions.last().instructions[jnz_index].jnz.offset = functions.last().instructions.size - jnz_index
functions.last().instructions[jz_index].jz.offset = functions.last().instructions.size - jz_index
}
return -1
}
@@ -440,11 +440,11 @@ obj bytecode_generator (Object) {
functions.last().instructions.add(byte_inst::jmp(j))
return -1
}
fun emit_jnz(reg: int, offset: int): int {
var j: jnz
fun emit_jz(reg: int, offset: int): int {
var j: jz
j.reg = reg
j.offset = offset
functions.last().instructions.add(byte_inst::jnz(j))
functions.last().instructions.add(byte_inst::jz(j))
return -1
}
fun emit_ret(): int {
@@ -474,7 +474,7 @@ obj bytecode_generator (Object) {
byte_inst::ldr(l) registers[l.to_reg] = stack_mem[registers[l.from_reg] + l.offset]
byte_inst::str(s) stack_mem[registers[s.to_reg] + s.offset] = registers[s.from_reg]
byte_inst::jmp(j) i += j.offset - 1 // to counteract pc inc
byte_inst::jnz(j) if (registers[j.reg] != 0)
byte_inst::jz(j) if (registers[j.reg] == 0)
i += j.offset - 1 // to counteract pc inc
byte_inst::call() error("call")
/*byte_inst::ret() return stack_mem[registers[0]]*/