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Basic when statement - Compile time if statement

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This is similar to an #if in C but handled during the semantic checking stage.
This commit is contained in:
Ginger Bill
2016-11-29 22:08:48 +00:00
parent 348bcc3f9a
commit b232b9d5ea
12 changed files with 584 additions and 328 deletions
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src/ssa.c
+27
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@@ -3815,6 +3815,29 @@ void ssa_build_stmt(ssaProcedure *proc, AstNode *node) {
proc->module->stmt_state_flags = prev_stmt_state_flags;
}
void ssa_build_when_stmt(ssaProcedure *proc, AstNodeWhenStmt *ws) {
ssaValue *cond = ssa_build_expr(proc, ws->cond);
GB_ASSERT(cond->kind == ssaValue_Constant &&
is_type_boolean(ssa_type(cond)));
GB_ASSERT(cond->Constant.value.kind == ExactValue_Bool);
if (cond->Constant.value.value_bool) {
ssa_build_stmt_list(proc, ws->body->BlockStmt.stmts);
} else if (ws->else_stmt) {
switch (ws->else_stmt->kind) {
case AstNode_BlockStmt:
ssa_build_stmt_list(proc, ws->else_stmt->BlockStmt.stmts);
break;
case AstNode_WhenStmt:
ssa_build_when_stmt(proc, &ws->else_stmt->WhenStmt);
break;
default:
GB_PANIC("Invalid `else` statement in `when` statement");
break;
}
}
}
void ssa_build_stmt_internal(ssaProcedure *proc, AstNode *node) {
switch (node->kind) {
case_ast_node(bs, EmptyStmt, node);
@@ -3827,6 +3850,10 @@ void ssa_build_stmt_internal(ssaProcedure *proc, AstNode *node) {
}
case_end;
case_ast_node(ws, WhenStmt, node);
ssa_build_when_stmt(proc, ws);
case_end;
case_ast_node(vd, VarDecl, node);
ssaModule *m = proc->module;
gbTempArenaMemory tmp = gb_temp_arena_memory_begin(&m->tmp_arena);