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#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <llvm-c/Analysis.h>
#include <llvm-c/Core.h>
#include "alloc.h"
#include "codegen.h"
#include "common.h"
#include "errors.h"
#include "parser.h"
#include "types.h"
static size_t codegenstmt(LLVMBuilderRef, LLVMValueRef *, struct ast,
struct lexemes, size_t)
__attribute__((nonnull));
static size_t codegenexpr(LLVMBuilderRef, LLVMValueRef *, struct ast,
struct lexemes, size_t, LLVMValueRef *)
__attribute__((nonnull));
static LLVMTypeRef type2llvm(struct type);
void
codegen(const char *file, struct type *types, struct ast ast,
struct lexemes toks)
{
LLVMModuleRef mod = LLVMModuleCreateWithName("oryx");
LLVMSetSourceFileName(mod, file, strlen(file));
LLVMBuilderRef builder = LLVMCreateBuilder();
LLVMValueRef *declvals = bufalloc(NULL, ast.len, sizeof(*declvals));
memset(declvals, 0, ast.len * sizeof(*declvals));
for (size_t i = 0; i < ast.len;) {
switch (ast.kinds[i]) {
case ASTDECL: {
/* TODO: Temporary allocator */
struct strview sv = toks.strs[ast.lexemes[i]];
char *name = bufalloc(NULL, sv.len + 1, 1);
((uchar *)memcpy(name, sv.p, sv.len))[sv.len] = 0;
LLVMTypeRef T = type2llvm(types[i]);
LLVMValueRef globl, val;
globl = LLVMAddGlobal(mod, T, name);
i = codegenexpr(builder, declvals, ast, toks, ast.kids[i].rhs, &val);
LLVMSetInitializer(globl, LLVMConstTrunc(val, T));
free(name);
break;
}
case ASTCDECL: {
idx_t_ expr = ast.kids[i].rhs;
if (ast.kinds[expr] != ASTFN) {
assert(!"not implemented");
__builtin_unreachable();
}
idx_t_ proto = ast.kids[expr].lhs, body = ast.kids[expr].rhs;
LLVMTypeRef ret;
LLVMTypeRef params[] = {0};
if (ast.kids[proto].rhs == AST_EMPTY)
ret = LLVMVoidType();
else {
size_t type = ast.kids[proto].rhs;
struct strview sv = toks.strs[ast.lexemes[type]];
/* TODO: Make int 32bit on 32bit platforms */
if (strncmp("int", sv.p, sv.len) == 0)
ret = LLVMInt64Type();
else
err("codegen: Unknown type: %.*s", (int)sv.len, sv.p);
}
LLVMTypeRef fnproto = LLVMFunctionType(ret, params, 0, false);
struct strview sv = toks.strs[ast.lexemes[i]];
char *fnname = bufalloc(NULL, sv.len + 1, 1);
((char *)memcpy(fnname, sv.p, sv.len))[sv.len] = 0;
LLVMValueRef fn = LLVMAddFunction(mod, fnname, fnproto);
LLVMBasicBlockRef entry = LLVMAppendBasicBlock(fn, "entry");
LLVMPositionBuilderAtEnd(builder, entry);
free(fnname);
for (i = ast.kids[body].lhs; i <= ast.kids[body].rhs;)
i = codegenstmt(builder, declvals, ast, toks, i);
break;
}
default:
err("codegen: Expected declaration");
}
}
free(declvals);
LLVMDisposeBuilder(builder);
char *error = NULL;
LLVMVerifyModule(mod, LLVMAbortProcessAction, &error);
LLVMDisposeMessage(error);
LLVMDumpModule(mod);
LLVMDisposeModule(mod);
}
size_t
codegenstmt(LLVMBuilderRef builder, LLVMValueRef *declvals, struct ast ast,
struct lexemes toks, size_t i)
{
switch (ast.kinds[i]) {
case ASTRET:
if (ast.kids[i].rhs == AST_EMPTY) {
LLVMBuildRetVoid(builder);
return i + 1;
}
LLVMValueRef v;
i = codegenexpr(builder, declvals, ast, toks, ast.kids[i].rhs, &v);
LLVMBuildRet(builder, v);
return i;
}
assert(!"unreachable");
__builtin_unreachable();
}
size_t
codegenexpr(LLVMBuilderRef builder, LLVMValueRef *declvals, struct ast ast,
struct lexemes toks, size_t i, LLVMValueRef *v)
{
(void)builder;
switch (ast.kinds[i]) {
case ASTNUMLIT: {
/* TODO: Arbitrary precision? */
struct strview sv = toks.strs[ast.lexemes[i]];
bool has_sep = memchr(sv.p, '\'', sv.len) != NULL;
/* TODO: Temporary one-time-use allocator? */
if (has_sep) {
size_t len = 0;
char *p = bufalloc(NULL, sv.len, 1);
for (size_t i = 0; i < sv.len; i++) {
if (sv.p[i] != '\'')
p[len++] = sv.p[i];
}
*v = LLVMConstIntOfStringAndSize(LLVMInt64Type(), p, len, 10);
free(p);
} else
*v = LLVMConstIntOfStringAndSize(LLVMInt64Type(), sv.p, sv.len, 10);
return i + 1;
}
case ASTIDENT:
err("codegen: %s: Not implemented", __func__);
}
assert(!"unreachable");
__builtin_unreachable();
}
LLVMTypeRef
type2llvm(struct type t)
{
switch (t.kind) {
case TYPE_UNSET:
case TYPE_CHECKING:
assert(!"codegen: Hit TYPE_UNSET or TYPE_CHECKING");
__builtin_unreachable();
case TYPE_FN:
case TYPE_F16:
case TYPE_F32:
case TYPE_F64:
err("codegen: %s: Not implemented", __func__);
case TYPE_NUM:
assert(t.issigned);
/* TODO: Arbitrary precision */
if (t.size == 0)
t.size = 8;
return LLVMIntType(t.size * 8);
default:
__builtin_unreachable();
}
}
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