domtest.c
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// RUN: %clang_analyze_cc1 %s \
// RUN: -analyzer-checker=debug.DumpDominators \
// RUN: -analyzer-checker=debug.DumpPostDominators \
// RUN: -analyzer-checker=debug.DumpControlDependencies \
// RUN: 2>&1 | FileCheck %s
// Test the DominatorsTree implementation with various control flows
int test1()
{
int x = 6;
int y = x/2;
int z;
while(y > 0) {
if(y < x) {
x = x/y;
y = y-1;
}else{
z = x - y;
}
x = x - 1;
x = x - 1;
}
z = x+y;
z = 3;
return 0;
}
// [B9 (ENTRY)] -> [B8] -> [B7] -> [B6] -> [B5] -> [B3] -> [B2]
// |\ \ / /
// | \ ---> [B4] ---> /
// | <---------------------------
// V
// [B1] -> [B0 (EXIT)]
// CHECK: Control dependencies (Node#,Dependency#):
// CHECK-NEXT: (2,7)
// CHECK-NEXT: (3,7)
// CHECK-NEXT: (4,6)
// CHECK-NEXT: (4,7)
// CHECK-NEXT: (5,6)
// CHECK-NEXT: (5,7)
// CHECK-NEXT: (6,7)
// CHECK-NEXT: (7,7)
// CHECK-NEXT: Immediate dominance tree (Node#,IDom#):
// CHECK-NEXT: (0,1)
// CHECK-NEXT: (1,7)
// CHECK-NEXT: (2,3)
// CHECK-NEXT: (3,6)
// CHECK-NEXT: (4,6)
// CHECK-NEXT: (5,6)
// CHECK-NEXT: (6,7)
// CHECK-NEXT: (7,8)
// CHECK-NEXT: (8,9)
// CHECK-NEXT: (9,9)
// CHECK-NEXT: Immediate post dominance tree (Node#,IDom#):
// CHECK-NEXT: (0,0)
// CHECK-NEXT: (1,0)
// CHECK-NEXT: (2,7)
// CHECK-NEXT: (3,2)
// CHECK-NEXT: (4,3)
// CHECK-NEXT: (5,3)
// CHECK-NEXT: (6,3)
// CHECK-NEXT: (7,1)
// CHECK-NEXT: (8,7)
// CHECK-NEXT: (9,8)
int test2()
{
int x,y,z;
x = 10; y = 100;
if(x > 0){
y = 1;
}else{
while(x<=0){
x++;
y++;
}
}
z = y;
return 0;
}
// <-------------
// / \
// -----------> [B4] -> [B3] -> [B2]
// / |
// / V
// [B7 (ENTRY)] -> [B6] -> [B5] -> [B1] -> [B0 (EXIT)]
// CHECK: Control dependencies (Node#,Dependency#):
// CHECK-NEXT: (2,4)
// CHECK-NEXT: (2,6)
// CHECK-NEXT: (3,4)
// CHECK-NEXT: (3,6)
// CHECK-NEXT: (4,6)
// CHECK-NEXT: (4,4)
// CHECK-NEXT: (5,6)
// CHECK-NEXT: Immediate dominance tree (Node#,IDom#):
// CHECK-NEXT: (0,1)
// CHECK-NEXT: (1,6)
// CHECK-NEXT: (2,3)
// CHECK-NEXT: (3,4)
// CHECK-NEXT: (4,6)
// CHECK-NEXT: (5,6)
// CHECK-NEXT: (6,7)
// CHECK-NEXT: (7,7)
// CHECK-NEXT: Immediate post dominance tree (Node#,IDom#):
// CHECK-NEXT: (0,0)
// CHECK-NEXT: (1,0)
// CHECK-NEXT: (2,4)
// CHECK-NEXT: (3,2)
// CHECK-NEXT: (4,1)
// CHECK-NEXT: (5,1)
// CHECK-NEXT: (6,1)
// CHECK-NEXT: (7,6)
int test3()
{
int x,y,z;
x = y = z = 1;
if(x>0) {
while(x>=0){
while(y>=x) {
x = x-1;
y = y/2;
}
}
}
z = y;
return 0;
}
// <- [B2] <-
// / \
// [B8 (ENTRY)] -> [B7] -> [B6] ---> [B5] -> [B4] -> [B3]
// \ | \ /
// \ | <-------------
// \ \
// --------> [B1] -> [B0 (EXIT)]
// CHECK: Control dependencies (Node#,Dependency#):
// CHECK-NEXT: (2,6)
// CHECK-NEXT: (2,7)
// CHECK-NEXT: (3,5)
// CHECK-NEXT: (3,6)
// CHECK-NEXT: (3,7)
// CHECK-NEXT: (4,5)
// CHECK-NEXT: (4,6)
// CHECK-NEXT: (4,7)
// CHECK-NEXT: (5,6)
// CHECK-NEXT: (5,5)
// CHECK-NEXT: (5,7)
// CHECK-NEXT: (6,7)
// CHECK-NEXT: (6,6)
// CHECK-NEXT: Immediate dominance tree (Node#,IDom#):
// CHECK-NEXT: (0,1)
// CHECK-NEXT: (1,7)
// CHECK-NEXT: (2,5)
// CHECK-NEXT: (3,4)
// CHECK-NEXT: (4,5)
// CHECK-NEXT: (5,6)
// CHECK-NEXT: (6,7)
// CHECK-NEXT: (7,8)
// CHECK-NEXT: (8,8)
// CHECK-NEXT: Immediate post dominance tree (Node#,IDom#):
// CHECK-NEXT: (0,0)
// CHECK-NEXT: (1,0)
// CHECK-NEXT: (2,6)
// CHECK-NEXT: (3,5)
// CHECK-NEXT: (4,3)
// CHECK-NEXT: (5,2)
// CHECK-NEXT: (6,1)
// CHECK-NEXT: (7,1)
// CHECK-NEXT: (8,7)
int test4()
{
int y = 3;
while(y > 0) {
if(y < 3) {
while(y>0)
y ++;
}else{
while(y<10)
y ++;
}
}
return 0;
}
// <----------------------------------
// / <----------------- \
// / / \ \
// [B12 (ENTRY)] -> [B11] -> [B10]-> [B9] -> [B8] ---> [B7] -> [B6] |
// | \ \ /
// | \ -----> [B2] --------/
// | \ /
// | -> [B5] -> [B4] -> [B3]
// | \ /
// | <------------
// \
// -> [B1] -> [B0 (EXIT)]
// CHECK: Control dependencies (Node#,Dependency#):
// CHECK-NEXT: (2,10)
// CHECK-NEXT: (3,5)
// CHECK-NEXT: (3,9)
// CHECK-NEXT: (3,10)
// CHECK-NEXT: (4,5)
// CHECK-NEXT: (4,9)
// CHECK-NEXT: (4,10)
// CHECK-NEXT: (5,9)
// CHECK-NEXT: (5,5)
// CHECK-NEXT: (5,10)
// CHECK-NEXT: (6,8)
// CHECK-NEXT: (6,9)
// CHECK-NEXT: (6,10)
// CHECK-NEXT: (7,8)
// CHECK-NEXT: (7,9)
// CHECK-NEXT: (7,10)
// CHECK-NEXT: (8,9)
// CHECK-NEXT: (8,8)
// CHECK-NEXT: (8,10)
// CHECK-NEXT: (9,10)
// CHECK-NEXT: (10,10)
// CHECK-NEXT: Immediate dominance tree (Node#,IDom#):
// CHECK-NEXT: (0,1)
// CHECK-NEXT: (1,10)
// CHECK-NEXT: (2,9)
// CHECK-NEXT: (3,4)
// CHECK-NEXT: (4,5)
// CHECK-NEXT: (5,9)
// CHECK-NEXT: (6,7)
// CHECK-NEXT: (7,8)
// CHECK-NEXT: (8,9)
// CHECK-NEXT: (9,10)
// CHECK-NEXT: (10,11)
// CHECK-NEXT: (11,12)
// CHECK-NEXT: (12,12)
// CHECK-NEXT: Immediate post dominance tree (Node#,IDom#):
// CHECK-NEXT: (0,0)
// CHECK-NEXT: (1,0)
// CHECK-NEXT: (2,10)
// CHECK-NEXT: (3,5)
// CHECK-NEXT: (4,3)
// CHECK-NEXT: (5,2)
// CHECK-NEXT: (6,8)
// CHECK-NEXT: (7,6)
// CHECK-NEXT: (8,2)
// CHECK-NEXT: (9,2)
// CHECK-NEXT: (10,1)
// CHECK-NEXT: (11,10)
// CHECK-NEXT: (12,11)
int test5()
{
int x,y,z,a,b,c;
x = 1;
y = 2;
z = 3;
a = 4;
b = 5;
c = 6;
if ( x < 10 ) {
if ( y < 10 ) {
if ( z < 10 ) {
x = 4;
} else {
x = 5;
}
a = 10;
} else {
x = 6;
}
b = 10;
} else {
x = 7;
}
c = 11;
return 0;
}
// [B0 (EXIT)] <--
// \
// [B11 (ENTY)] -> [B10] -> [B9] -> [B8] -> [B7] -> [B5] -> [B3] -> [B1]
// | | | / / /
// | | V / / /
// | V [B6] --> / /
// V [B4] -----------------> /
// [B2]--------------------------------->
// CHECK: Control dependencies (Node#,Dependency#):
// CHECK-NEXT: (2,10)
// CHECK-NEXT: (3,10)
// CHECK-NEXT: (4,9)
// CHECK-NEXT: (4,10)
// CHECK-NEXT: (5,9)
// CHECK-NEXT: (5,10)
// CHECK-NEXT: (6,8)
// CHECK-NEXT: (6,9)
// CHECK-NEXT: (6,10)
// CHECK-NEXT: (7,8)
// CHECK-NEXT: (7,9)
// CHECK-NEXT: (7,10)
// CHECK-NEXT: (8,9)
// CHECK-NEXT: (8,10)
// CHECK-NEXT: (9,10)
// CHECK-NEXT: Immediate dominance tree (Node#,IDom#):
// CHECK-NEXT: (0,1)
// CHECK-NEXT: (1,10)
// CHECK-NEXT: (2,10)
// CHECK-NEXT: (3,9)
// CHECK-NEXT: (4,9)
// CHECK-NEXT: (5,8)
// CHECK-NEXT: (6,8)
// CHECK-NEXT: (7,8)
// CHECK-NEXT: (8,9)
// CHECK-NEXT: (9,10)
// CHECK-NEXT: (10,11)
// CHECK-NEXT: (11,11)
// CHECK-NEXT: Immediate post dominance tree (Node#,IDom#):
// CHECK-NEXT: (0,0)
// CHECK-NEXT: (1,0)
// CHECK-NEXT: (2,1)
// CHECK-NEXT: (3,1)
// CHECK-NEXT: (4,3)
// CHECK-NEXT: (5,3)
// CHECK-NEXT: (6,5)
// CHECK-NEXT: (7,5)
// CHECK-NEXT: (8,5)
// CHECK-NEXT: (9,3)
// CHECK-NEXT: (10,1)
// CHECK-NEXT: (11,10)