Add autogenerated docstrings to synthesized code

We now stringify the correctness conditions to generate docstrings for
the synthesized code.

Closes #512

Time commitment: about 6 hours

1 files changed, 57 insertions, 0 deletions

diff --git a/p256_32.c b/p256_32.c
index faaa0b04e..ef038ddfa 100644
--- a/p256_32.c
+++ b/p256_32.c
@@ -17,6 +17,9 @@ typedef signed char fiat_p256_int1;
 
 
 /*
+ * The function fiat_p256_addcarryx_u32 is an add with carry.
+ * out1 = (arg1 + arg2 + arg3) mod 2^32
+ * ∧ out2 = ⌊(arg1 + arg2 + arg3) / 2^32⌋
  * Input Bounds:
  *   arg1: [0x0 ~> 0x1]
  *   arg2: [0x0 ~> 0xffffffff]
@@ -34,6 +37,9 @@ static void fiat_p256_addcarryx_u32(uint32_t* out1, fiat_p256_uint1* out2, fiat_
 }
 
 /*
+ * The function fiat_p256_subborrowx_u32 is a sub with borrow.
+ * out1 = (-arg1 + arg2 + -arg3) mod 2^32
+ * ∧ out2 = -⌊(-arg1 + arg2 + -arg3) / 2^32⌋
  * Input Bounds:
  *   arg1: [0x0 ~> 0x1]
  *   arg2: [0x0 ~> 0xffffffff]
@@ -51,6 +57,9 @@ static void fiat_p256_subborrowx_u32(uint32_t* out1, fiat_p256_uint1* out2, fiat
 }
 
 /*
+ * The function fiat_p256_mulx_u32 is an extended multiplication.
+ * out1 = (arg1 * arg2) mod 2^32
+ * ∧ out2 = ⌊arg1 * arg2 / 2^32⌋
  * Input Bounds:
  *   arg1: [0x0 ~> 0xffffffff]
  *   arg2: [0x0 ~> 0xffffffff]
@@ -67,6 +76,8 @@ static void fiat_p256_mulx_u32(uint32_t* out1, uint32_t* out2, uint32_t arg1, ui
 }
 
 /*
+ * The function fiat_p256_cmovznz_u32 is a single-word conditional move.
+ * out1 = (if arg1 = 0 then arg2 else arg3)
  * Input Bounds:
  *   arg1: [0x0 ~> 0x1]
  *   arg2: [0x0 ~> 0xffffffff]
@@ -82,6 +93,12 @@ static void fiat_p256_cmovznz_u32(uint32_t* out1, fiat_p256_uint1 arg1, uint32_t
 }
 
 /*
+ * The function fiat_p256_mul does stuff.
+ * arg1 = map (λ x, ⌊eval arg1 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7] ∧ 0 ≤ eval arg1 < m →
+ * arg2 = map (λ x, ⌊eval arg2 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7] ∧ 0 ≤ eval arg2 < m →
+ * eval (fiat_p256_from_montgomery out1) mod m = (eval (fiat_p256_from_montgomery arg1) * eval (fiat_p256_from_montgomery arg2)) mod m
+ * ∧ out1 = map (λ x, ⌊eval out1 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7]
+ * ∧ 0 ≤ eval out1 < m
  * Input Bounds:
  *   arg1: [[0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff]]
  *   arg2: [[0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff]]
@@ -1132,6 +1149,11 @@ static void fiat_p256_mul(uint32_t out1[8], const uint32_t arg1[8], const uint32
 }
 
 /*
+ * The function fiat_p256_square does stuff.
+ * arg1 = map (λ x, ⌊eval arg1 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7] ∧ 0 ≤ eval arg1 < m →
+ * eval (fiat_p256_from_montgomery out1) mod m = (eval (fiat_p256_from_montgomery arg1) * eval (fiat_p256_from_montgomery arg1)) mod m
+ * ∧ out1 = map (λ x, ⌊eval out1 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7]
+ * ∧ 0 ≤ eval out1 < m
  * Input Bounds:
  *   arg1: [[0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff]]
  * Output Bounds:
@@ -2181,6 +2203,12 @@ static void fiat_p256_square(uint32_t out1[8], const uint32_t arg1[8]) {
 }
 
 /*
+ * The function fiat_p256_add does stuff.
+ * arg1 = map (λ x, ⌊eval arg1 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7] ∧ 0 ≤ eval arg1 < m →
+ * arg2 = map (λ x, ⌊eval arg2 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7] ∧ 0 ≤ eval arg2 < m →
+ * eval (fiat_p256_from_montgomery out1) mod m = (eval (fiat_p256_from_montgomery arg1) + eval (fiat_p256_from_montgomery arg2)) mod m
+ * ∧ out1 = map (λ x, ⌊eval out1 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7]
+ * ∧ 0 ≤ eval out1 < m
  * Input Bounds:
  *   arg1: [[0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff]]
  *   arg2: [[0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff]]
@@ -2266,6 +2294,12 @@ static void fiat_p256_add(uint32_t out1[8], const uint32_t arg1[8], const uint32
 }
 
 /*
+ * The function fiat_p256_sub does stuff.
+ * arg1 = map (λ x, ⌊eval arg1 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7] ∧ 0 ≤ eval arg1 < m →
+ * arg2 = map (λ x, ⌊eval arg2 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7] ∧ 0 ≤ eval arg2 < m →
+ * eval (fiat_p256_from_montgomery out1) mod m = (eval (fiat_p256_from_montgomery arg1) - eval (fiat_p256_from_montgomery arg2)) mod m
+ * ∧ out1 = map (λ x, ⌊eval out1 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7]
+ * ∧ 0 ≤ eval out1 < m
  * Input Bounds:
  *   arg1: [[0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff]]
  *   arg2: [[0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff]]
@@ -2334,6 +2368,11 @@ static void fiat_p256_sub(uint32_t out1[8], const uint32_t arg1[8], const uint32
 }
 
 /*
+ * The function fiat_p256_opp does stuff.
+ * arg1 = map (λ x, ⌊eval arg1 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7] ∧ 0 ≤ eval arg1 < m →
+ * eval (fiat_p256_from_montgomery out1) mod m = -eval (fiat_p256_from_montgomery arg1) mod m
+ * ∧ out1 = map (λ x, ⌊eval out1 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7]
+ * ∧ 0 ≤ eval out1 < m
  * Input Bounds:
  *   arg1: [[0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff]]
  * Output Bounds:
@@ -2401,6 +2440,11 @@ static void fiat_p256_opp(uint32_t out1[8], const uint32_t arg1[8]) {
 }
 
 /*
+ * The function fiat_p256_from_montgomery does stuff.
+ * arg1 = map (λ x, ⌊eval arg1 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7] ∧ 0 ≤ eval arg1 < m →
+ * eval out1 mod m = (eval arg1 * 26959946660873538060741835960514744168633162839172946800369217830912^8) mod m
+ * ∧ out1 = map (λ x, ⌊eval out1 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7]
+ * ∧ 0 ≤ eval out1 < m
  * Input Bounds:
  *   arg1: [[0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff]]
  * Output Bounds:
@@ -3005,6 +3049,9 @@ static void fiat_p256_from_montgomery(uint32_t out1[8], const uint32_t arg1[8])
 }
 
 /*
+ * The function fiat_p256_nonzero does stuff.
+ * arg1 = map (λ x, ⌊eval arg1 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7] ∧ 0 ≤ eval arg1 < m →
+ * out1 = 0 ↔ eval (fiat_p256_from_montgomery arg1) mod m = 0
  * Input Bounds:
  *   arg1: [[0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff]]
  * Output Bounds:
@@ -3016,6 +3063,8 @@ static void fiat_p256_nonzero(uint32_t* out1, const uint32_t arg1[8]) {
 }
 
 /*
+ * The function fiat_p256_selectznz is a multi-limb conditional select.
+ * eval out1 = (if arg1 = 0 then eval arg2 else eval arg3)
  * Input Bounds:
  *   arg1: [0x0 ~> 0x1]
  *   arg2: [[0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff]]
@@ -3051,6 +3100,9 @@ static void fiat_p256_selectznz(uint32_t out1[8], fiat_p256_uint1 arg1, const ui
 }
 
 /*
+ * The function fiat_p256_to_bytes does stuff.
+ * arg1 = map (λ x, ⌊eval arg1 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7] ∧ 0 ≤ eval arg1 < m →
+ * out1 = map (λ x, ⌊(eval arg1 mod m) mod 2^(8 * (x + 1)) / 2^(8 * x)⌋) [0..31]
  * Input Bounds:
  *   arg1: [[0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff], [0x0 ~> 0xffffffff]]
  * Output Bounds:
@@ -3155,6 +3207,11 @@ static void fiat_p256_to_bytes(uint8_t out1[32], const uint32_t arg1[8]) {
 }
 
 /*
+ * The function fiat_p256_from_bytes does stuff.
+ * arg1 = map (λ x, ⌊bytes_eval arg1 mod 2^(8 * (x + 1)) / 2^(8 * x)⌋) [0..31] ∧ 0 ≤ bytes_eval arg1 < m →
+ * eval out1 mod m = bytes_eval arg1 mod m
+ * ∧ out1 = map (λ x, ⌊eval out1 mod 2^(32 * (x + 1)) / 2^(32 * x)⌋) [0..7]
+ * ∧ 0 ≤ eval out1 < m
  * Input Bounds:
  *   arg1: [[0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff], [0x0 ~> 0xff]]
  * Output Bounds: