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POvalgrind shows an error when running a comparison
primarykey
Id
10865105
data
AcceptedAnswerId
10865477
AnswerCount
1
ClosedDate
CommentCount
12
CommunityOwnedDate
CreationDate
2012-06-02T19:05:41.383
FavoriteCount
0
LastActivityDate
2012-06-02T19:56:50.410
LastEditDate
2012-06-02T19:25:02
LastEditorUserId
539465
OwnerUserId
539465
ParentId
0
PostTypeId
1
Score
1
ViewCount
100
LastEditorDisplayName
text
Body
I have the following function <pre><code>#include <stdio.h> #include <stdlib.h> #include "block.h" bool block_equal(const struct block *block1, const struct block *block2) { if ((block1 == NULL) ^ (block2 == NULL)) return false; else if (block1 == NULL & block2 == NULL) return true; else { // ... Some stuff } } </code></pre> When I run it with a pointer to an initialized <code>struct block</code> and <code>NULL</code>, valgrind shows this error (line 6 is the first comparison): <pre><code>==24444== Conditional jump or move depends on uninitialised value(s) ==24444== at 0x402E34: block_equal (block.c:6) ==24444== by 0x4025D3: test_chunks_write (test_chunks.c:22) ==24444== by 0x4E31FE8: ??? (in /usr/lib/libcunit.so.1.0.1) ==24444== by 0x4E323C6: ??? (in /usr/lib/libcunit.so.1.0.1) ==24444== by 0x4E326E7: CU_run_all_tests (in /usr/lib/libcunit.so.1.0.1) ==24444== by 0x401627: main (tests.c:15) </code></pre> EDIT: Here is the call of <code>block_equal</code>: <pre><code>#include <stdlib.h> #include <CUnit/CUnit.h> #include "../chunks.h" #include "../block.h" void test_chunks_write(void) { struct block *block1, *block2; block1 = malloc(sizeof(struct block)); block2 = malloc(sizeof(struct block)); block1->type = BLOCK_WOOD; block2->type = BLOCK_STONE; chunks *chunks = chunks_empty(); coordinates coord1; coordinates coord2; for (int i=0; i<SPACE_DIMENSION; i++) { coord1[i] = i+1; coord2[i] = 2*i+5; } chunks_write_data(&chunks, coord1, block1); CU_ASSERT(block_equal(block1, chunks_select_data(chunks, coord1))) CU_ASSERT_FALSE(block_equal(block2, chunks_select_data(chunks, coord1))) struct block* block3 = chunks_select_data(chunks, coord2); /////////////////////////////////////////////////////////////////////////////////////////////// // According to the debugger, at this point block2 is 0x605600 and block3 is 0x0 CU_ASSERT_FALSE(block_equal(block2, block3)) // ... } </code></pre>
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<c><valgrind>
Title
valgrind shows an error when running a comparison
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USValentin Lorentz
UserOwnerUserId
1. USValentin Lorentz
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
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 PTAnswer
VotesPostIdCreationDate
1. VO
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 POvalgrind shows an error when running a comparison
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 This table or related slice is empty.
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 VTUpMod
CommentsPostId

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