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#include <assert.h>
#include <stdio.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"
struct cgctx {
LLVMModuleRef mod;
LLVMBuilderRef bob;
struct strview namespace;
};
static size_t codegendecl(struct cgctx, struct type *, struct ast,
struct lexemes, size_t)
__attribute__((nonnull));
static size_t codegenexpr(struct cgctx, struct type *, struct ast,
struct lexemes, size_t, LLVMValueRef *)
__attribute__((nonnull));
static LLVMTypeRef type2llvm(struct type);
/* TODO: Don’t do this? */
#define lengthof(xs) (sizeof(xs) / sizeof(*(xs)))
static struct {
struct strview key;
LLVMValueRef val;
} constants[1024];
static size_t constcnt;
void
codegen(const char *file, struct type *types, struct ast ast,
struct lexemes toks)
{
struct cgctx ctx = {0};
ctx.mod = LLVMModuleCreateWithName("oryx");
ctx.bob = LLVMCreateBuilder();
LLVMSetSourceFileName(ctx.mod, file, strlen(file));
for (size_t i = 0; i < ast.len;) {
// LLVMValueRef val;
assert(ast.kinds[i] == ASTDECL || ast.kinds[i] == ASTCDECL);
i = codegendecl(ctx, types, ast, toks, i);
/* 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;
//
// LLVMValueRef globl, init;
// LLVMTypeRef vartype = type2llvm(types[i]);
//
// globl = LLVMAddGlobal(mod, vartype, name);
// LLVMSetGlobalConstant(globl, ast.kinds[i] == ASTCDECL);
//
// if (ast.kids[i].rhs != AST_EMPTY) {
// i = codegenexpr(bob, types, ast, toks, ast.kids[i].rhs, &init);
// init = LLVMConstTrunc(init, vartype);
// } else {
// init = LLVMConstNull(vartype);
// i = fwdnode(ast, i);
// }
//
// LLVMSetInitializer(globl, init);
// LLVMSetLinkage(globl, LLVMPrivateLinkage);
//
// free(name);
}
LLVMDisposeBuilder(ctx.bob);
char *error = NULL;
LLVMVerifyModule(ctx.mod, LLVMAbortProcessAction, &error);
LLVMDisposeMessage(error);
LLVMDumpModule(ctx.mod);
LLVMDisposeModule(ctx.mod);
}
size_t
codegendecl(struct cgctx ctx, struct type *types, struct ast ast,
struct lexemes toks, size_t i)
{
struct strview ident = toks.strs[ast.lexemes[i]];
char *name;
if (ctx.namespace.len != 0) {
size_t namelen = ident.len + ctx.namespace.len + 1;
name = bufalloc(NULL, namelen + 1, 1);
sprintf(name, "%.*s.%.*s", (int)ctx.namespace.len, ctx.namespace.p,
(int)ident.len, ident.p);
} else {
name = bufalloc(NULL, ident.len + 1, 1);
memcpy(name, ident.p, ident.len);
name[ident.len] = 0;
}
LLVMValueRef val;
LLVMTypeRef vartype = type2llvm(types[i]);
if (ast.kids[i].rhs != AST_EMPTY) {
i = codegenexpr(ctx, types, ast, toks, ast.kids[i].rhs, &val);
val = LLVMConstTrunc(val, vartype);
} else {
i = fwdnode(ast, i);
val = LLVMConstNull(vartype);
}
LLVMValueRef globl = LLVMAddGlobal(ctx.mod, vartype, name);
LLVMSetInitializer(globl, val);
LLVMSetLinkage(globl, LLVMLinkerPrivateLinkage);
free(name);
return i;
}
size_t
codegenexpr(struct cgctx ctx, struct type *types, struct ast ast,
struct lexemes toks, size_t i, LLVMValueRef *v)
{
(void)ctx;
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(type2llvm(types[i]), p, len, 10);
free(p);
} else {
*v = LLVMConstIntOfStringAndSize(type2llvm(types[i]), sv.p, sv.len,
10);
}
return i + 1;
}
case ASTIDENT:
err("codegen: %s: Not implemented", __func__);
default:
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:
err("codegen: %s: Not implemented", __func__);
case TYPE_F16:
return LLVMHalfType();
case TYPE_F32:
return LLVMFloatType();
case TYPE_F64:
return LLVMDoubleType();
case TYPE_NUM:
assert(t.issigned);
/* TODO: Arbitrary precision */
if (t.size == 0)
return LLVMInt64Type();
return LLVMIntType((unsigned)t.size * 8);
default:
__builtin_unreachable();
}
}
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