mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-06 21:20:07 +00:00
256630c84d
Runtime errors and support for line number reporting with the error.
185 lines
5.2 KiB
R
185 lines
5.2 KiB
R
#include "Compiler.h"
|
|
#include "Instruction.h"
|
|
#include "Nil.h"
|
|
#include "Cons.h"
|
|
#include "defs.h"
|
|
|
|
@implementation Compiler
|
|
+ (id) newWithLambda: (SchemeObject) xp scope: (Scope) sc
|
|
{
|
|
return [[self alloc] initWithLambda: xp scope: sc];
|
|
}
|
|
|
|
- (id) initWithLambda: (SchemeObject) xp scope: (Scope) sc
|
|
{
|
|
self = [super init];
|
|
sexpr = xp;
|
|
scope = sc;
|
|
lambdaSym = [Symbol forString: "lambda"];
|
|
quoteSym = [Symbol forString: "quote"];
|
|
code = [CompiledCode new];
|
|
err = NIL;
|
|
return self;
|
|
}
|
|
|
|
// FIXME: handle variable argument lists
|
|
- (void) emitBuildEnvironment: (SchemeObject) arguments
|
|
{
|
|
local integer count, index;
|
|
local SchemeObject cur;
|
|
|
|
scope = [Scope newWithOuter: scope];
|
|
count = 0;
|
|
for (cur = arguments; cur != [Nil nil]; cur = [cur cdr]) {
|
|
count++;
|
|
}
|
|
[code addInstruction: [Instruction opcode: MAKEENV operand: count]];
|
|
[code addInstruction: [Instruction opcode: LOADENV]];
|
|
cur = arguments;
|
|
for (index = 0; index < count; cur = [cur cdr]) {
|
|
[scope addName: (Symbol) [cur car]];
|
|
[code addInstruction: [Instruction opcode: SET operand: index]];
|
|
index++;
|
|
}
|
|
}
|
|
|
|
- (void) emitSequence: (SchemeObject) expressions
|
|
{
|
|
local SchemeObject cur;
|
|
|
|
for (cur = expressions; cur != [Nil nil]; cur = [cur cdr]) {
|
|
[self emitExpression: [cur car]];
|
|
if (err) return;
|
|
}
|
|
}
|
|
|
|
- (void) emitVariable: (Symbol) sym
|
|
{
|
|
local integer depth = [scope depthOf: sym];
|
|
local integer index = [scope indexOf: sym];
|
|
|
|
[code addInstruction: [Instruction opcode: LOADENV]];
|
|
if (depth != -1) {
|
|
for (; depth; depth--) {
|
|
[code addInstruction: [Instruction opcode: GETLINK]];
|
|
}
|
|
[code addInstruction: [Instruction opcode: GET operand: index]];
|
|
} else {
|
|
index = [code addConstant: sym];
|
|
[code addInstruction: [Instruction opcode: LOADLITS]];
|
|
[code addInstruction: [Instruction opcode: GET operand: index]];
|
|
[code addInstruction: [Instruction opcode: GETGLOBAL]];
|
|
}
|
|
}
|
|
|
|
- (void) emitExpression: (SchemeObject) expression
|
|
{
|
|
if ([expression isKindOfClass: [Cons class]]) {
|
|
if ([expression car] == lambdaSym) {
|
|
[self emitLambda: expression];
|
|
if (err) return;
|
|
} else if ([expression car] == quoteSym) {
|
|
[self emitConstant: [[expression cdr] car]];
|
|
} else {
|
|
[self emitApply: expression];
|
|
if (err) return;
|
|
}
|
|
} else if ([expression isKindOfClass: [Symbol class]]) {
|
|
[self emitVariable: (Symbol) expression];
|
|
} else {
|
|
[self emitConstant: expression];
|
|
}
|
|
}
|
|
|
|
- (void) emitArguments: (SchemeObject) expression
|
|
{
|
|
if (expression == [Nil nil]) {
|
|
return;
|
|
} else {
|
|
[self emitArguments: [expression cdr]];
|
|
if (err) return;
|
|
[self emitExpression: [expression car]];
|
|
if (err) return;
|
|
[code addInstruction: [Instruction opcode: PUSH]];
|
|
}
|
|
}
|
|
|
|
- (void) emitApply: (SchemeObject) expression
|
|
{
|
|
local Instruction label = [Instruction opcode: LABEL];
|
|
[code addInstruction: [Instruction opcode: MAKECONT label: label]];
|
|
[self emitArguments: [expression cdr]];
|
|
if (err) return;
|
|
[self emitExpression: [expression car]];
|
|
if (err) return;
|
|
[code addInstruction: [Instruction opcode: CALL]];
|
|
[code addInstruction: label];
|
|
}
|
|
|
|
- (void) emitLambda: (SchemeObject) expression
|
|
{
|
|
local Compiler compiler = [Compiler newWithLambda: expression
|
|
scope: scope];
|
|
local SchemeObject res;
|
|
local integer index;
|
|
|
|
res = [compiler compile];
|
|
if ([res isError]) {
|
|
err = (Error) res;
|
|
return;
|
|
}
|
|
index = [code addConstant: res];
|
|
[code addInstruction: [Instruction opcode: LOADLITS]];
|
|
[code addInstruction: [Instruction opcode: GET operand: index]];
|
|
[code addInstruction: [Instruction opcode: MAKECLOSURE]];
|
|
}
|
|
|
|
- (void) emitConstant: (SchemeObject) expression
|
|
{
|
|
local integer index;
|
|
index = [code addConstant: expression];
|
|
[code addInstruction: [Instruction opcode: LOADLITS]];
|
|
[code addInstruction: [Instruction opcode: GET operand: index]];
|
|
}
|
|
|
|
- (void) checkLambdaSyntax: (SchemeObject) expression
|
|
{
|
|
if (![expression isKindOfClass: [Cons class]] ||
|
|
[expression car] != lambdaSym ||
|
|
[expression cdr] == [Nil nil] ||
|
|
[[expression cdr] cdr] == [Nil nil]) {
|
|
err = [Error type: "syntax"
|
|
message: "malformed lambda expression"
|
|
by: expression];
|
|
}
|
|
}
|
|
|
|
- (SchemeObject) compile
|
|
{
|
|
[self checkLambdaSyntax: sexpr];
|
|
if (err) {
|
|
return err;
|
|
}
|
|
[self emitBuildEnvironment: [[sexpr cdr] car]];
|
|
if (err) {
|
|
return err;
|
|
}
|
|
[self emitSequence: [[sexpr cdr] cdr]];
|
|
if (err) {
|
|
return err;
|
|
}
|
|
[code addInstruction: [Instruction opcode: RETURN]];
|
|
[code compile];
|
|
return code;
|
|
}
|
|
|
|
- (void) markReachable
|
|
{
|
|
[code mark];
|
|
[sexpr mark];
|
|
[lambdaSym mark];
|
|
[quoteSym mark];
|
|
[Scope mark];
|
|
}
|
|
|
|
@end
|