From 690034ca8abcd931e2fb6bb8129450deee701179 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Tue, 28 Jun 2022 23:46:08 +0200
Subject: Major work on c parser.

---
 tests/test/cpp.scm | 407 ++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 389 insertions(+), 18 deletions(-)

(limited to 'tests/test/cpp.scm')

diff --git a/tests/test/cpp.scm b/tests/test/cpp.scm
index 9c720fde..f3b9ff72 100644
--- a/tests/test/cpp.scm
+++ b/tests/test/cpp.scm
@@ -8,32 +8,403 @@
   :use-module ((c lex) :select (lex))
   :use-module ((c parse) :select (parse-lexeme-tree)))
 
+;; Note that the lexer's output isn't stable.
+;; The tests here are more to see where the lexer succeeds but the parser fails.
+;; So changing the lexer test cases isn't a problem
+;; but don't change the parser test cases
+
 (define run (compose parse-lexeme-tree lex))
 
-(test-equal
-  '(+ (post-increment (dereference C)) 3)
-  (run "(*C)++ + 3"))
+(define-syntax let-group
+  (syntax-rules ()
+    ((let ((form name) rest ...) body ...)
+     (test-group name
+       (let ((form name)
+             rest ...)
+         body ...)))))
+
+(let-group
+ ((form "(*C)++ + 3"))
+ (test-equal '(infix (postfix (group (prefix (prefix-operator "*")
+                                             (variable "C")))
+                              (postfix-operator "++"))
+                     (operator "+")
+                     (integer (base-10 "3")))
+   (lex form))
+ (test-equal '(+ (post-increment (dereference C)) 3)
+   (run form)))
+
+(let-group
+ ((form "*C++ + 3"))
+ (test-equal '(infix (postfix (prefix (prefix-operator "*")
+                                      (variable "C"))
+                              (postfix-operator "++"))
+                     (operator "+")
+                     (integer (base-10 "3")))
+   (lex form))
+ (test-equal '(+ (post-increment (dereference C)) 3)
+   (run form)))
+
+(let-group
+ ((form "*C++"))
+ (test-equal '(postfix (prefix (prefix-operator "*")
+                               (variable "C"))
+                       (postfix-operator "++"))
+   (lex form))
+ (test-equal '(post-increment (dereference C))
+   (run form)))
+
+(let-group
+ ((form "C++ + C++"))
+ (test-equal '(infix (postfix (variable "C")
+                              (postfix-operator "++"))
+                     (operator "+")
+                     (postfix (variable "C")
+                              (postfix-operator "++")))
+   (lex form))
+ (test-equal '(+ (post-increment C) (post-increment C))
+   (run form)))
+
+(let-group
+ ((form "++C + ++C"))
+ (test-equal '(infix (prefix (prefix-operator "++")
+                             (variable "C"))
+                     (operator "+")
+                     (prefix (prefix-operator "++")
+                             (variable "C")))
+   (lex form))
+ (test-equal '(+ (pre-increment C) (pre-increment C))
+   (run form)))
+
+(let-group
+ ((form "2 + 2 * 2"))
+ (test-equal '(infix (integer (base-10 "2"))
+                     (operator "+")
+                     (infix (integer (base-10 "2"))
+                            (operator "*")
+                            (integer (base-10 "2"))))
+   (lex form))
+ (test-equal '(+ 2 (* 2 2)) (run form)))
+
+(let-group
+ ((form "2 * 2 + 2"))
+ (test-equal '(infix (integer (base-10 "2"))
+                     (operator "*")
+                     (infix (integer (base-10 "2"))
+                            (operator "+")
+                            (integer (base-10 "2"))))
+   (lex form))
+ (test-equal '(+ (* 2 2) 2) (run form)))
+
+(let-group
+ ((form "2+2+2"))
+ (test-equal '(infix (integer (base-10 "2"))
+                     (operator "+")
+                     (infix (integer (base-10 "2"))
+                            (operator "+")
+                            (integer (base-10 "2")))) (lex form))
+ (test-equal '(+ 2 2 2) (run form)))
+
+
+
+
+(test-skip "Strings")
+(test-skip "__asm__")
+(test-skip "Token concatenation")
+(test-skip "Floating point numbers")
+
+;; Hand picked forms from output of `cpp -dM /usr/include/termios.h` on
+;; FreeBSD 13.1-RELEASE releng/13.1-n250148-fc952ac2212 GENERIC amd64
+;; 2022-06-28
+
+(let ((form "00000200"))
+  (test-equal '(integer (base-8 "0000200")) (lex form))
+  (test-equal 128 (run form)))
+
+(let ((form "0"))
+  (test-equal '(integer (base-10 "0")) (lex form))
+  (test-equal 0 (run form)))
+
+(let ((form "1000000U"))
+  (test-equal '(integer (base-10 "1000000") (integer-suffix "U")) (lex form))
+  (test-equal '(as-type (unsigned) 1000000) (run form)))
+
+
+(let ((form "0x10c"))
+  (test-equal '(integer (base-16 "10c")) (lex form))
+  (test-equal 268 (run form)))
+
+;; Lexer keeps original case, handled later by parser
+(let ((form "0X10C"))
+  (test-equal '(integer (base-16 "10C")) (lex form))
+  (test-equal 268 (run form)))
+
+(let ((form "a != b"))
+  (test-equal '(infix (variable "a")
+                      (operator "!=")
+                      (variable "b"))
+    (lex form))
+  (test-equal '(not_eq a b) (run form)))
+
+(let ((form "((c) == (val) && (val) != _POSIX_VDISABLE)"))
+  ;; (test-equal '() (lex form))
+  (test-equal '(and (== c val)
+                    (not_eq val _POSIX_VDISABLE))
+    (run form)))
+
+(let ((form "CTRL('O')"))
+  (test-equal '(funcall (variable "CTRL") (group (char "O"))) (lex form))
+  (test-equal '(funcall CTRL 79) (run form)))
+
+(let ((form "CREPRINT"))
+  (test-equal '(variable "CREPRINT") (lex form))
+  (test-equal 'CREPRINT (run form)))
+
+(let ((form "(CCTS_OFLOW | CRTS_IFLOW)"))
+  (test-equal '(group (infix (variable "CCTS_OFLOW")
+                             (operator "|")
+                             (variable "CRTS_IFLOW")))
+    (lex form))
+  (test-equal '(bitor CCTS_OFLOW CRTS_IFLOW) (run form)))
+
+;; ((x) >= 'a' && (x) <= 'z'
+;;   ? ((x) - 'a' + 1)
+;;   : (((x) - 'a' + 1) & 0x7f))
+(let ((form "((x) >= 'a' && (x) <= 'z' ? ((x) - 'a' + 1) : (((x) - 'a' + 1) & 0x7f))"))
+  ;; (test-equal '() (lex form))
+  (test-equal '(ternary
+                (and (>= x #x61)
+                     (<= x #x7A))
+                (- x (+ #x61 1))
+                (bitand (- x (+ #x61 1)) 127))
+    (run form)))
+
+(let ((form "((x) & ~(IOCPARM_MASK << 16))"))
+  ;; (test-equal '() (lex form))
+  (test-equal '(bitand x (compl (<< IOCPARM_MASK 16))) (run form)))
+
+(let ((form "(((x) >> 8) & 0xff)"))
+  ;; (test-equal '() (lex form))
+  (test-equal '(bitand (>> x 8) 255) (run form)))
+
+(let ((form "(((x) >> 16) & IOCPARM_MASK)"))
+  ;; (test-equal '() (lex form))
+  (test-equal '(bitand (>> x 16) IOCPARM_MASK) (run form)))
+
+(let ((form "((1 << IOCPARM_SHIFT) - 1)"))
+  ;; (test-equal '() (lex form))
+  (test-equal '(- (<< 1 IOCPARM_SHIFT) 1) (run form)))
+
+(let ((form "_IO('t', 120)"))
+  (test-equal '(funcall
+                (variable "_IO")
+                (group (infix (char "t")
+                              (operator ",")
+                              (integer (base-10 "120")))))
+    (lex form))
+  (test-equal '(funcall _IO (#{,}# 116 120)) (run form)))
+
+;; note the lone type
+(let ((form "_IOW('t', 98, int)"))
+  ;; (test-equal '() (lex form))
+  (test-equal '(funcall _IOW (#{,}# 116 98 int))
+    (run form)))
+
+;; note the multi-word type
+(let ((form "_IOR('t', 19, struct termios)"))
+  ;; (test-equal '() (lex form))
+  (test-equal '(funcall _IOR (#{,}# 116 19 (struct-type termios))) (run form)))
+
+
+(test-group "Token concatenation"
+  (let ((form "x ## y"))
+    (test-equal '() (lex form))
+    (test-equal '0 (run form))))
+
+(test-group "Floating point numbers"
+  (let ((form "4.9406564584124654e-324"))
+    (test-equal '(float (base-10 "4") (base-10)) (lex form))
+    (test-equal '0 (run form)))
+
+  (let ((form "1.7976931348623157e+308"))
+    (test-equal '() (lex form))
+    (test-equal '0 (run form))))
+
+(test-group "Typecasts"
+
+  (let ((form "(unsigned) 5"))
+    (test-equal '((group (variable "unsigned"))
+                  (integer (base-10 "5")))
+      (lex form))
+    (test-equal '(as-type (unsigned) 5)
+      (run form)))
+
+  (let ((form "(unsigned integer) 5"))
+    (test-equal '((group (variable "unsigned")
+                         (variable "integer"))
+                  (integer (base-10 "5")))
+      (lex form))
+    (test-equal '(as-type (unsigned integer) 5) (run form)))
+
+  (test-group "Pointer with space"
+    (let ((form "(int *) 5"))
+      (test-equal '((group (postfix (variable "int")
+                                    (postfix-operator "*")))
+                    (integer (base-10 "5")))
+        (lex form))
+      (test-equal '(as-type (int *) 5)
+        (run form))))
+
+  (test-group "Pointer without space"
+    (let ((form "(int*) 5"))
+      (test-equal '((group (postfix (variable "int")
+                                    (postfix-operator "*")))
+                    (integer (base-10 "5")))
+        (lex form))
+      (test-equal '(as-type (int *) 5)
+        (run form))))
+
+  (test-group "Multi word type pointer"
+    (let ((form "(unsigned int*) 5"))
+      (test-equal '((group (variable "unsigned")
+                           (postfix (variable "int")
+                                    (postfix-operator "*")))
+                    (integer (base-10 "5")))
+        (lex form))
+      (test-equal '(as-type (unsigned int *) 5)
+        (run form))))
+
+  (test-group "Double cast"
+    (let ((form "(int)(unsigned) 5"))
+      (test-equal '((group (variable "int"))
+                    (group (variable "unsigned"))
+                    (integer (base-10 "5"))) (lex form))
+      (test-equal '(as-type (int) (as-type (unsigned) 5))
+        (run form))))
+
+  (test-group "Cast with operation"
+    (let ((form "(int) 5 + 7"))
+      (test-equal '((group (variable "int"))
+                    (infix (integer (base-10 "5"))
+                           (operator "+")
+                           (integer (base-10 "7"))))
+        (lex form))
+
+      (test-equal '(+ (as-type (int) 5) 7)
+        (run form))))
+
+
+
+  (test-group "Tripple cast, with value inside paranthesis"
+    (let ((form "(type)(__uintptr_t)(const void *)(var)"))
+      (test-equal '((group (variable "type"))
+                    (group (variable "__uintptr_t"))
+                    (group (variable "const")
+                           (postfix (variable "void")
+                                    (postfix-operator "*")))
+                    (group (variable "var")))
+        (lex form))
+      (test-equal '(as-type (type)
+                            (as-type (__uintptr_t)
+                                     (as-type (const void *)
+                                              var)))
+        (run form))))
+
+  (test-group "Same as above, but whole thing inside parenthesis"
+    (let ((form "((type)(__uintptr_t)(const void *)(var))"))
+      (test-equal '(group (group (variable "type"))
+                          (group (variable "__uintptr_t"))
+                          (group (variable "const")
+                                 (postfix (variable "void")
+                                          (postfix-operator "*")))
+                          (group (variable "var")))
+        (lex form))
+      (test-equal '(as-type (type)
+                            (as-type (__uintptr_t)
+                                     (as-type (const void *)
+                                              var)))
+        (run form))))
+
+  (let ((form "((type)(__uintptr_t)(const volatile void *)(var))"))
+    ;; (test-equal '() (lex form))
+    (test-equal '(as-type (type)
+                          (as-type (__uintptr_t)
+                                   (as-type (const volatile void *)
+                                            var)))
+      (run form)))
+
+  (let ((form "((unsigned long) ((inout) | (((len) & IOCPARM_MASK) << 16) | ((group) << 8) | (num)))"))
+    (test-equal '(group (group (variable "unsigned") (variable "long"))
+                        (group (infix (group (variable "inout"))
+                                      (operator "|")
+                                      (infix (group (infix (group (infix (group (variable "len"))
+                                                                         (operator "&")
+                                                                         (variable "IOCPARM_MASK")))
+                                                           (operator "<<")
+                                                           (integer (base-10 "16"))))
+                                             (operator "|")
+                                             (infix (group (infix (group (variable "group"))
+                                                                  (operator "<<")
+                                                                  (integer (base-10 "8"))))
+                                                    (operator "|")
+                                                    (group (variable "num")))))))
+      (lex form))
+    (test-equal '(as-type (unsigned long)
+                          (bitor (<< (bitand len IOCPARM_MASK) 16)
+                                 (<< group 8)
+                                 num))
+      (run form))))
 
-(test-equal
-  '(+ (post-increment (dereference C)) 3)
-  (run "*C++ + 3"))
 
-(test-equal
-  '(post-increment (dereference C))
-  (run "*C++"))
+(test-group "Strings"
+  (test-group "Empty string"
+    (let ((form "\"\""))
+      (test-equal '(string "") (lex form))
+      (test-equal #vu8(0) (run form))))
 
-(test-equal
-  '(+ (post-increment C) (post-increment C))
-  (run "C++ + C++"))
+  (test-group "Simple string"
+    (let ((form "\"li\""))
+      (test-equal '(string "li") (lex form))
+      (test-equal #vu8(#x6C #x69 0) (run form))))
 
-(test-equal
-  '(+ (pre-increment C) (pre-increment C))
-  (run "++C + ++C"))
+  (test-group "Implicit concatenation of strings"
+    (let ((form "\"a\" \"b\""))
+      (test-equal '((string "a")
+                    (string "b"))
+        (lex form))
+      (test-equal #vu8(#x61 #x62 0)
+                  (run form))))
 
-(test-equal '(+ 2 (* 2 2)) (run "2 + 2 * 2"))
+  (test-group "Implicit concatenation of string and macro"
+    (let ((form "\"a\" MACRO"))
+      (test-equal '() (lex form))
+      (test-equal '() (run form))))
 
-(test-equal '(+ (* 2 2) 2) (run "2 * 2 + 2"))
+  (test-group "String with escape"
+    (let ((form (string #\\ #\")))
+      (test-equal `(string ,(string #\")) (lex form))
+      (test-equal #vu8(34 0) (run form)))))
 
-(test-equal '(+ 2 2 2) (run "2+2+2"))
+(test-group "__asm__"
+  (let ((form "__asm__(\".globl \" __XSTRING(sym))"))
+    (test-equal '() (lex form))
+    ;; TODO implicit string concatenation
+    (test-equal '(funcall __asm__
+                          (string ".globl ")
+                          (funcall __XSTRING sym)) (run form))))
 
+(let ((form "__attribute__((__aligned__(x)))"))
+  (test-equal '(funcall (variable "__attribute__")
+                        (group (group (funcall (variable "__aligned__")
+                                               (group (variable "x"))))))
+    (lex form))
+  ;; This drops the extra set of parenthesis. Do we care?
+  (test-equal '(funcall __attribute__
+                        (funcall __aligned__ x))
+    (run form)))
 
+;; TODO concatenation rules
+;; #define __CONCAT(x,y) __CONCAT1(x,y)
+;; #define __CONCAT1(x,y) x ## y
+;; #define __CONSTANT_CFSTRINGS__ 1
+;; #define __COPYRIGHT(s) __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
-- 
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