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Fix an uninitialized memory use error when interpreting

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compact unwind encodings for x86_64 / i386 omit-frame-pointer
code.  It was possible for lldb to get the location of saved
registers incorrect for some of these functions.
<rdar://problem/20753264> 

llvm-svn: 236478
This commit is contained in:
Jason Molenda
2015-05-05 02:05:53 +00:00
parent d752050cc3
commit 9060e987a0
1 changed files with 4 additions and 4 deletions
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8
lldb/source/Symbol/CompactUnwindInfo.cpp
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@@ -841,7 +841,7 @@ CompactUnwindInfo::CreateUnwindPlan_x86_64 (Target &target, FunctionInfo &functi
//
// This is done with Lehmer code permutation, e.g. see
// http://stackoverflow.com/questions/1506078/fast-permutation-number-permutation-mapping-algorithms
int permunreg[6];
int permunreg[6] = {0, 0, 0, 0, 0, 0};
// This decodes the variable-base number in the 10 bits
// and gives us the Lehmer code sequence which can then
@@ -901,7 +901,7 @@ CompactUnwindInfo::CreateUnwindPlan_x86_64 (Target &target, FunctionInfo &functi
// Decode the Lehmer code for this permutation of
// the registers v. http://en.wikipedia.org/wiki/Lehmer_code
int registers[6];
int registers[6] = { UNWIND_X86_64_REG_NONE, UNWIND_X86_64_REG_NONE, UNWIND_X86_64_REG_NONE, UNWIND_X86_64_REG_NONE, UNWIND_X86_64_REG_NONE, UNWIND_X86_64_REG_NONE };
bool used[7] = { false, false, false, false, false, false, false };
for (uint32_t i = 0; i < register_count; i++)
{
@@ -1115,7 +1115,7 @@ CompactUnwindInfo::CreateUnwindPlan_i386 (Target &target, FunctionInfo &function
//
// This is done with Lehmer code permutation, e.g. see
// http://stackoverflow.com/questions/1506078/fast-permutation-number-permutation-mapping-algorithms
int permunreg[6];
int permunreg[6] = {0, 0, 0, 0, 0, 0};
// This decodes the variable-base number in the 10 bits
// and gives us the Lehmer code sequence which can then
@@ -1175,7 +1175,7 @@ CompactUnwindInfo::CreateUnwindPlan_i386 (Target &target, FunctionInfo &function
// Decode the Lehmer code for this permutation of
// the registers v. http://en.wikipedia.org/wiki/Lehmer_code
int registers[6];
int registers[6] = { UNWIND_X86_REG_NONE, UNWIND_X86_REG_NONE, UNWIND_X86_REG_NONE, UNWIND_X86_REG_NONE, UNWIND_X86_REG_NONE, UNWIND_X86_REG_NONE };
bool used[7] = { false, false, false, false, false, false, false };
for (uint32_t i = 0; i < register_count; i++)
{